# gnus.texi   [plain text]

\input texinfo

@setfilename ../info/gnus
@settitle Gnus Manual
@syncodeindex fn cp
@syncodeindex vr cp
@syncodeindex pg cp

@copying
2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.

@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.2 or
Invariant Sections, with the Front-Cover texts being A GNU
Manual'', and with the Back-Cover Texts as in (a) below.  A copy of the
license is included in the section entitled GNU Free Documentation

(a) The FSF's Back-Cover Text is: You have freedom to copy and modify
Software Foundation raise funds for GNU development.''

This document is part of a collection distributed under the GNU Free
Documentation License.  If you want to distribute this document
separately from the collection, you can do so by adding a copy of the
license to the document, as described in section 6 of the license.
@end quotation
@end copying

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@iflatex
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me.  Usage of the patent (@dfn{Master/Slave Relationships In Computer
Applications}) will be much more expensive, of course.)

@findex gnus-slave
Anyway, you start one Gnus up the normal way with @kbd{M-x gnus} (or
however you do it).  Each subsequent slave Gnusae should be started with
@kbd{M-x gnus-slave}.  These slaves won't save normal @file{.newsrc}
files, but instead save @dfn{slave files} that contain information only
on what groups have been read in the slave session.  When a master Gnus
starts, it will read (and delete) these slave files, incorporating all
information from them.  (The slave files will be read in the sequence
they were created, so the latest changes will have precedence.)

Information from the slave files has, of course, precedence over the
information in the normal (i.e., master) @file{.newsrc} file.

If the @file{.newsrc*} files have not been saved in the master when the
slave starts, you may be prompted as to whether to read an auto-save
file.  If you answer yes'', the unsaved changes to the master will be
incorporated into the slave.  If you answer no'', the slave may see some

@node New Groups
@section New Groups
@cindex new groups
@cindex subscription

@vindex gnus-check-new-newsgroups
If you are satisfied that you really never want to see any new groups,
you can set @code{gnus-check-new-newsgroups} to @code{nil}.  This will
also save you some time at startup.  Even if this variable is
@code{nil}, you can always subscribe to the new groups just by pressing
@kbd{U} in the group buffer (@pxref{Group Maintenance}).  This variable
is @code{ask-server} by default.  If you set this variable to
@code{always}, then Gnus will query the back ends for new groups even
when you do the @kbd{g} command (@pxref{Scanning New Messages}).

* Checking New Groups::         Determining what groups are new.
* Subscription Methods::        What Gnus should do with new groups.
* Filtering New Groups::        Making Gnus ignore certain new groups.

@node Checking New Groups
@subsection Checking New Groups

Gnus normally determines whether a group is new or not by comparing the
list of groups from the active file(s) with the lists of subscribed and
dead groups.  This isn't a particularly fast method.  If
server for new groups since the last time.  This is both faster and
cheaper.  This also means that you can get rid of the list of killed
groups altogether, so you may set @code{gnus-save-killed-list} to
@code{nil}, which will save time both at startup, at exit, and all over.
Saves disk space, too.  Why isn't this the default, then?
Unfortunately, not all servers support this command.

I bet I know what you're thinking now: How do I find out whether my
server supports @code{ask-server}?  No?  Good, because I don't have a
fail-safe answer.  I would suggest just setting this variable to
@code{ask-server} and see whether any new groups appear within the next
few days.  If any do, then it works.  If none do, then it doesn't
work.  I could write a function to make Gnus guess whether the server
supports @code{ask-server}, but it would just be a guess.  So I won't.
You could @code{telnet} to the server and say @code{HELP} and see
whether it lists @samp{NEWGROUPS} among the commands it understands.  If
it does, then it might work.  (But there are servers that lists
@samp{NEWGROUPS} without supporting the function properly.)

This variable can also be a list of select methods.  If so, Gnus will
issue an @code{ask-server} command to each of the select methods, and
subscribe them (or not) using the normal methods.  This might be handy
if you are monitoring a few servers for new groups.  A side effect is
that startup will take much longer, so you can meditate while waiting.
Use the mantra dingnusdingnusdingnus'' to achieve permanent bliss.

@node Subscription Methods
@subsection Subscription Methods

@vindex gnus-subscribe-newsgroup-method
What Gnus does when it encounters a new group is determined by the
@code{gnus-subscribe-newsgroup-method} variable.

This variable should contain a function.  This function will be called
with the name of the new group as the only parameter.

Some handy pre-fab functions are:

@table @code

@item gnus-subscribe-zombies
@vindex gnus-subscribe-zombies
Make all new groups zombies.  This is the default.  You can browse the
zombies later (with @kbd{A z}) and either kill them all off properly
(with @kbd{S z}), or subscribe to them (with @kbd{u}).

@item gnus-subscribe-randomly
@vindex gnus-subscribe-randomly
Subscribe all new groups in arbitrary order.  This really means that all
new groups will be added at the top'' of the group buffer.

@item gnus-subscribe-alphabetically
@vindex gnus-subscribe-alphabetically
Subscribe all new groups in alphabetical order.

@item gnus-subscribe-hierarchically
@vindex gnus-subscribe-hierarchically
Subscribe all new groups hierarchically.  The difference between this
function and @code{gnus-subscribe-alphabetically} is slight.
@code{gnus-subscribe-alphabetically} will subscribe new groups in a strictly
alphabetical fashion, while this function will enter groups into its
hierarchy.  So if you want to have the @samp{rec} hierarchy before the
@samp{comp} hierarchy, this function will not mess that configuration
up.  Or something like that.

@item gnus-subscribe-interactively
@vindex gnus-subscribe-interactively
Subscribe new groups interactively.  This means that Gnus will ask
you about @strong{all} new groups.  The groups you choose to subscribe
to will be subscribed hierarchically.

@item gnus-subscribe-killed
@vindex gnus-subscribe-killed
Kill all new groups.

@item gnus-subscribe-topics
@vindex gnus-subscribe-topics
Put the groups into the topic that has a matching @code{subscribe} topic
parameter (@pxref{Topic Parameters}).  For instance, a @code{subscribe}
topic parameter that looks like

@example
"nnslashdot"
@end example

will mean that all groups that match that regex will be subscribed under
that topic.

If no topics match the groups, the groups will be subscribed in the
top-level topic.

@end table

@vindex gnus-subscribe-hierarchical-interactive
A closely related variable is
@code{gnus-subscribe-hierarchical-interactive}.  (That's quite a
mouthful.)  If this variable is non-@code{nil}, Gnus will ask you in a
hierarchical fashion whether to subscribe to new groups or not.  Gnus
will ask you for each sub-hierarchy whether you want to descend the
hierarchy or not.

One common mistake is to set the variable a few paragraphs above
(@code{gnus-subscribe-newsgroup-method}) to
@code{gnus-subscribe-hierarchical-interactive}.  This is an error.  This
will not work.  This is ga-ga.  So don't do it.

@node Filtering New Groups
@subsection Filtering New Groups

A nice and portable way to control which new newsgroups should be
subscribed (or ignored) is to put an @dfn{options} line at the start of
the @file{.newsrc} file.  Here's an example:

@example
options -n !alt.all !rec.all sci.all
@end example

@vindex gnus-subscribe-options-newsgroup-method
This line obviously belongs to a serious-minded intellectual scientific
person (or she may just be plain old boring), because it says that all
groups that have names beginning with @samp{alt} and @samp{rec} should
be ignored, and all groups with names beginning with @samp{sci} should
be subscribed.  Gnus will not use the normal subscription method for
subscribing these groups.
variable defaults to @code{gnus-subscribe-alphabetically}.

@vindex gnus-options-not-subscribe
@vindex gnus-options-subscribe
If you don't want to mess with your @file{.newsrc} file, you can just
set the two variables @code{gnus-options-subscribe} and
@code{gnus-options-not-subscribe}.  These two variables do exactly the
same as the @file{.newsrc} @samp{options -n} trick.  Both are regexps,
and if the new group matches the former, it will be unconditionally
subscribed, and if it matches the latter, it will be ignored.

@vindex gnus-auto-subscribed-groups
Yet another variable that meddles here is
@code{gnus-auto-subscribed-groups}.  It works exactly like
@code{gnus-options-subscribe}, and is therefore really superfluous,
but I thought it would be nice to have two of these.  This variable is
more meant for setting some ground rules, while the other variable is
used more for user fiddling.  By default this variable makes all new
groups that come from mail back ends (@code{nnml}, @code{nnbabyl},
@code{nnfolder}, @code{nnmbox}, @code{nnmh}, and @code{nnmaildir})
subscribed.  If you don't like that, just set this variable to
@code{nil}.

New groups that match this regexp are subscribed using
@code{gnus-subscribe-options-newsgroup-method}.

@node Changing Servers
@section Changing Servers
@cindex changing servers

Sometimes it is necessary to move from one @acronym{NNTP} server to another.
This happens very rarely, but perhaps you change jobs, or one server is
very flaky and you want to use another.

Changing the server is pretty easy, right?  You just change
@code{gnus-select-method} to point to the new server?

@emph{Wrong!}

Article numbers are not (in any way) kept synchronized between different
@acronym{NNTP} servers, and the only way Gnus keeps track of what articles
you have read is by keeping track of article numbers.  So when you
change @code{gnus-select-method}, your @file{.newsrc} file becomes
worthless.

Gnus provides a few functions to attempt to translate a @file{.newsrc}
file from one server to another.  They all have one thing in
common---they take a looong time to run.  You don't want to use these
functions more than absolutely necessary.

@kindex M-x gnus-change-server
@findex gnus-change-server
the articles you have read and compare @code{Message-ID}s and map the
article numbers of the read articles and article marks.  The @kbd{M-x
gnus-change-server} command will do this for all your native groups.  It
will prompt for the method you want to move to.

@kindex M-x gnus-group-move-group-to-server
@findex gnus-group-move-group-to-server
You can also move individual groups with the @kbd{M-x
gnus-group-move-group-to-server} command.  This is useful if you want to
move a (foreign) group from one server to another.

@kindex M-x gnus-group-clear-data-on-native-groups
@findex gnus-group-clear-data-on-native-groups
and read ranges have become worthless.  You can use the @kbd{M-x
gnus-group-clear-data-on-native-groups} command to clear out all data
that you have on your native groups.  Use with caution.

@kindex M-x gnus-group-clear-data
@findex gnus-group-clear-data
Clear the data from the current group only---nix out marks and the

After changing servers, you @strong{must} move the cache hierarchy away,
since the cached articles will have wrong article numbers, which will
affect which articles Gnus thinks are read.
@code{gnus-group-clear-data-on-native-groups} will ask you if you want
to have it done automatically; for @code{gnus-group-clear-data}, you
can use @kbd{M-x gnus-cache-move-cache} (but beware, it will move the
cache for all groups).

@node Startup Files
@section Startup Files
@cindex startup files
@cindex .newsrc
@cindex .newsrc.el
@cindex .newsrc.eld

Most common Unix news readers use a shared startup file called
@file{.newsrc}.  This file contains all the information about what
groups are subscribed, and which articles in these groups have been

Things got a bit more complicated with @sc{gnus}.  In addition to
keeping the @file{.newsrc} file updated, it also used a file called
@file{.newsrc.el} for storing all the information that didn't fit into
the @file{.newsrc} file.  (Actually, it also duplicated everything in
the @file{.newsrc} file.)  @sc{gnus} would read whichever one of these
files was the most recently saved, which enabled people to swap between

That was kinda silly, so Gnus went one better: In addition to the
@file{.newsrc} and @file{.newsrc.el} files, Gnus also has a file called
@file{.newsrc.eld}.  It will read whichever of these files that are most
recent, but it will never write a @file{.newsrc.el} file.  You should
never delete the @file{.newsrc.eld} file---it contains much information
not stored in the @file{.newsrc} file.

@vindex gnus-save-newsrc-file
You can turn off writing the @file{.newsrc} file by setting
@code{gnus-save-newsrc-file} to @code{nil}, which means you can delete
the file and save some space, as well as exiting from Gnus faster.
However, this will make it impossible to use other newsreaders than
Gnus.  But hey, who would want to, right?  Similarly, setting
@code{gnus-read-newsrc-file} to @code{nil} makes Gnus ignore the
@file{.newsrc} file and any @file{.newsrc-SERVER} files, which can be
convenient if you use a different news reader occasionally, and you
want to read a different subset of the available groups with that

@vindex gnus-save-killed-list
If @code{gnus-save-killed-list} (default @code{t}) is @code{nil}, Gnus
will not save the list of killed groups to the startup file.  This will
save both time (when starting and quitting) and space (on disk).  It
will also mean that Gnus has no record of what groups are new or old,
so the automatic new groups subscription methods become meaningless.
You should always set @code{gnus-check-new-newsgroups} to @code{nil} or
@code{ask-server} if you set this variable to @code{nil} (@pxref{New
Groups}).  This variable can also be a regular expression.  If that's
the case, remove all groups that do not match this regexp before
saving.  This can be useful in certain obscure situations that involve
several servers where not all servers support @code{ask-server}.

@vindex gnus-startup-file
@vindex gnus-backup-startup-file
@vindex version-control
The @code{gnus-startup-file} variable says where the startup files are.
The default value is @file{~/.newsrc}, with the Gnus (El Dingo) startup
file being whatever that one is, with a @samp{.eld} appended.
If you want version control for this file, set
@code{gnus-backup-startup-file}.  It respects the same values as the
@code{version-control} variable.

@vindex gnus-save-newsrc-hook
@vindex gnus-save-quick-newsrc-hook
@vindex gnus-save-standard-newsrc-hook
@code{gnus-save-newsrc-hook} is called before saving any of the newsrc
files, while @code{gnus-save-quick-newsrc-hook} is called just before
saving the @file{.newsrc.eld} file, and
@code{gnus-save-standard-newsrc-hook} is called just before saving the
@file{.newsrc} file.  The latter two are commonly used to turn version
control on or off.  Version control is on by default when saving the
startup files.  If you want to turn backup creation off, say something like:

@lisp
(defun turn-off-backup ()
(set (make-local-variable 'backup-inhibited) t))

@end lisp

@vindex gnus-init-file
@vindex gnus-site-init-file
When Gnus starts, it will read the @code{gnus-site-init-file}
(@file{.../site-lisp/gnus-init} by default) and @code{gnus-init-file}
(@file{~/.gnus} by default) files.  These are normal Emacs Lisp files
and can be used to avoid cluttering your @file{~/.emacs} and
@file{site-init} files with Gnus stuff.  Gnus will also check for files
with the same names as these, but with @file{.elc} and @file{.el}
suffixes.  In other words, if you have set @code{gnus-init-file} to
@file{~/.gnus}, it will look for @file{~/.gnus.elc}, @file{~/.gnus.el},
and finally @file{~/.gnus} (in this order).  If Emacs was invoked with
the @option{-q} or @option{--no-init-file} options (@pxref{Initial
Options, ,Initial Options, emacs, The Emacs Manual}), Gnus doesn't read
@code{gnus-init-file}.

@node Auto Save
@section Auto Save
@cindex dribble file
@cindex auto-save

Whenever you do something that changes the Gnus data (reading articles,
catching up, killing/subscribing groups), the change is added to a
special @dfn{dribble buffer}.  This buffer is auto-saved the normal
Emacs way.  If your Emacs should crash before you have saved the
@file{.newsrc} files, all changes you have made can be recovered from
this file.

If Gnus detects this file at startup, it will ask the user whether to
read it.  The auto save file is deleted whenever the real startup file is
saved.

@vindex gnus-use-dribble-file
If @code{gnus-use-dribble-file} is @code{nil}, Gnus won't create and
maintain a dribble buffer.  The default is @code{t}.

@vindex gnus-dribble-directory
Gnus will put the dribble file(s) in @code{gnus-dribble-directory}.  If
this variable is @code{nil}, which it is by default, Gnus will dribble
into the directory where the @file{.newsrc} file is located.  (This is
normally the user's home directory.)  The dribble file will get the same
file permissions as the @file{.newsrc} file.

If @code{gnus-always-read-dribble-file} is non-@code{nil}, Gnus will
read the dribble file on startup without querying the user.

@node The Active File
@section The Active File
@cindex active file
@cindex ignored groups

When Gnus starts, or indeed whenever it tries to determine whether new
articles have arrived, it reads the active file.  This is a very large
file that lists all the active groups and articles on the server.

@vindex gnus-ignored-newsgroups
Before examining the active file, Gnus deletes all lines that match the
regexp @code{gnus-ignored-newsgroups}.  This is done primarily to reject
any groups with bogus names, but you can use this variable to make Gnus
ignore hierarchies you aren't ever interested in.  However, this is not
recommended.  In fact, it's highly discouraged.  Instead, @pxref{New
Groups} for an overview of other variables that can be used instead.

@c This variable is
@c @code{nil} by default, and will slow down active file handling somewhat
@c if you set it to anything else.

The active file can be rather Huge, so if you have a slow network, you
can set @code{gnus-read-active-file} to @code{nil} to prevent Gnus from
reading the active file.  This variable is @code{some} by default.

Gnus will try to make do by getting information just on the groups that
you actually subscribe to.

Note that if you subscribe to lots and lots of groups, setting this
variable to @code{nil} will probably make Gnus slower, not faster.  At
present, having this variable @code{nil} will slow Gnus down
considerably, unless you read news over a 2400 baud modem.

This variable can also have the value @code{some}.  Gnus will then
attempt to read active info only on the subscribed groups.  On some
servers this is quite fast (on sparkling, brand new INN servers that
support the @code{LIST ACTIVE group} command), on others this isn't fast
at all.  In any case, @code{some} should be faster than @code{nil}, and
is certainly faster than @code{t} over slow lines.

Some news servers (old versions of Leafnode and old versions of INN, for
instance) do not support the @code{LIST ACTIVE group}.  For these
servers, @code{nil} is probably the most efficient value for this
variable.

If this variable is @code{nil}, Gnus will ask for group info in total
lock-step, which isn't very fast.  If it is @code{some} and you use an
@acronym{NNTP} server, Gnus will pump out commands as fast as it can, and
read all the replies in one swoop.  This will normally result in better
performance, but if the server does not support the aforementioned
@code{LIST ACTIVE group} command, this isn't very nice to the server.

If you think that starting up Gnus takes too long, try all the three
different values for this variable and see what works best for you.

In any case, if you use @code{some} or @code{nil}, you should definitely
kill all groups that you aren't interested in to speed things up.

Note that this variable also affects active file retrieval from
secondary select methods.

@node Startup Variables
@section Startup Variables

@table @code

A hook run while Gnus is being loaded.  Note that this hook will
normally be run just once in each Emacs session, no matter how many
times you start Gnus.

@item gnus-before-startup-hook
@vindex gnus-before-startup-hook
A hook run after starting up Gnus successfully.

@item gnus-startup-hook
@vindex gnus-startup-hook
A hook run as the very last thing after starting up Gnus

@item gnus-started-hook
@vindex gnus-started-hook
A hook that is run as the very last thing after starting up Gnus
successfully.

@item gnus-setup-news-hook
@vindex gnus-setup-news-hook
A hook that is run after reading the @file{.newsrc} file(s), but before
generating the group buffer.

@item gnus-check-bogus-newsgroups
@vindex gnus-check-bogus-newsgroups
If non-@code{nil}, Gnus will check for and delete all bogus groups at
startup.  A @dfn{bogus group} is a group that you have in your
@file{.newsrc} file, but doesn't exist on the news server.  Checking for
bogus groups can take quite a while, so to save time and resources it's
best to leave this option off, and do the checking for bogus groups once
in a while from the group buffer instead (@pxref{Group Maintenance}).

@item gnus-inhibit-startup-message
@vindex gnus-inhibit-startup-message
If non-@code{nil}, the startup message won't be displayed.  That way,
of doing your job.  Note that this variable is used before

@item gnus-no-groups-message
@vindex gnus-no-groups-message
Message displayed by Gnus when no groups are available.

@item gnus-play-startup-jingle
@vindex gnus-play-startup-jingle
If non-@code{nil}, play the Gnus jingle at startup.

@item gnus-startup-jingle
@vindex gnus-startup-jingle
Jingle to be played if the above variable is non-@code{nil}.  The
default is @samp{Tuxedomoon.Jingle4.au}.

@end table

@node Group Buffer
@chapter Group Buffer
@cindex group buffer

@c Alex Schroeder suggests to rearrange this as follows:
@c
@c <kensanata> ok, just save it for reference.  I'll go to bed in a minute.
@c   1. Selecting a Group, 2. (new) Finding a Group, 3. Group Levels,
@c   4. Subscription Commands, 5. Group Maneuvering, 6. Group Data,
@c   7. Group Score, 8. Group Buffer Format
@c <kensanata> Group Levels should have more information on levels 5 to 9.  I
@c   suggest to split the 4th paragraph ("Gnus considers groups...") as follows:
@c <kensanata> First, "Gnus considers groups... (default 9)."
@c <kensanata> New, a table summarizing what levels 1 to 9 mean.
@c <kensanata> Third, "Gnus treats subscribed ... reasons of efficiency"
@c <kensanata> Then expand the next paragraph or add some more to it.
@c    This short one sentence explains levels 1 and 2, therefore I understand
@c    that I should keep important news at 3 and boring news at 4.
@c    Say so!  Then go on to explain why I should bother with levels 6 to 9.
@c    Maybe keep those that you don't want to read temporarily at 6,
@c    those that you never want to read at 8, those that offend your
@c    human rights at 9...

The @dfn{group buffer} lists all (or parts) of the available groups.  It
is the first buffer shown when Gnus starts, and will never be killed as
long as Gnus is active.

@iftex
@iflatex
\gnusfigure{The Group Buffer}{320}{
\put(75,50){\epsfig{figure=ps/group,height=9cm}}
\put(120,37){\makebox(0,0)[t]{Buffer name}}
\put(120,38){\vector(1,2){10}}
\put(40,60){\makebox(0,0)[r]{Mode line}}
\put(40,58){\vector(1,0){30}}
\put(200,28){\makebox(0,0)[t]{Native select method}}
\put(200,26){\vector(-1,2){15}}
}
@end iflatex
@end iftex

* Group Buffer Format::         Information listed and how you can change it.
* Group Maneuvering::           Commands for moving in the group buffer.
* Selecting a Group::           Actually reading news.
* Subscription Commands::       Unsubscribing, killing, subscribing.
* Group Data::                  Changing the info for a group.
* Group Levels::                Levels? What are those, then?
* Group Score::                 A mechanism for finding out what groups you like.
* Marking Groups::              You can mark groups for later processing.
* Foreign Groups::              Creating and editing groups.
* Group Parameters::            Each group may have different parameters set.
* Listing Groups::              Gnus can list various subsets of the groups.
* Sorting Groups::              Re-arrange the group order.
* Group Maintenance::           Maintaining a tidy @file{.newsrc} file.
* Browse Foreign Server::       You can browse a server.  See what it has to offer.
* Exiting Gnus::                Stop reading news and get some work done.
* Group Topics::                A folding group mode divided into topics.
* Misc Group Stuff::            Other stuff that you can to do.

@node Group Buffer Format
@section Group Buffer Format

* Group Line Specification::    Deciding how the group buffer is to look.
* Group Mode Line Specification::  The group buffer mode line.
* Group Highlighting::          Having nice colors in the group buffer.

You can customize the Group Mode tool bar, see @kbd{M-x
customize-apropos RET gnus-group-tool-bar}.  This feature is only
available in Emacs.

The tool bar icons are now (de)activated correctly depending on the
cursor position.  Therefore, moving around in the Group Buffer is
slower.  You can disable this via the variable
@code{gnus-group-update-tool-bar}.  Its default value depends on your
Emacs version.

@node Group Line Specification
@subsection Group Line Specification
@cindex group buffer format

The default format of the group buffer is nice and dull, but you can
make it as exciting and ugly as you feel like.

Here's a couple of example group lines:

@example
25: news.announce.newusers
*    0: alt.fan.andrea-dworkin
@end example

Quite simple, huh?

You can see that there are 25 unread articles in
@samp{news.announce.newusers}.  There are no unread articles, but some
ticked articles, in @samp{alt.fan.andrea-dworkin} (see that little
asterisk at the beginning of the line?).

@vindex gnus-group-line-format
You can change that format to whatever you want by fiddling with the
@code{gnus-group-line-format} variable.  This variable works along the
lines of a @code{format} specification, which is pretty much the same as
a @code{printf} specifications, for those of you who use (feh!) C.
@xref{Formatting Variables}.

@samp{%M%S%5y:%B%(%g%)\n} is the value that produced those lines above.

There should always be a colon on the line; the cursor always moves to
the colon after performing an operation.  @xref{Positioning
Point}.  Nothing else is required---not even the group name.  All
displayed text is just window dressing, and is never examined by Gnus.
Gnus stores all real information it needs using text properties.

(Note that if you make a really strange, wonderful, spreadsheet-like
layout, everybody will believe you are hard at work with the accounting

Here's a list of all available format characters:

@table @samp

@item M
An asterisk if the group only has marked articles.

@item S
Whether the group is subscribed.

@item L
Level of subscribedness.

@item N

@item I
Number of dormant articles.

@item T
Number of ticked articles.

@item R

@item U
Number of unseen articles.

@item t
Estimated total number of articles.  (This is really @var{max-number}
minus @var{min-number} plus 1.)

Gnus uses this estimation because the @acronym{NNTP} protocol provides
the true unread message count is not possible efficiently.  For
hysterical raisins, even the mail back ends, where the true number of
unread messages might be available efficiently, use the same limited
interface.  To remove this restriction from Gnus means that the back
end interface has to be changed, which is not an easy job.  If you

@item y
Number of unread, unticked, non-dormant articles.

@item i
Number of ticked and dormant articles.

@item g
Full group name.

@item G
Group name.

@item C
Group comment (@pxref{Group Parameters}) or group name if there is no
comment element in the group parameters.

@item D
Newsgroup description.  You need to read the group descriptions
before these will appear, and to do that, you either have to set
@code{gnus-read-active-file} or use the group buffer @kbd{M-d}
command.

@item o
@samp{m} if moderated.

@item O
@samp{(m)} if moderated.

@item s
Select method.

@item B
If the summary buffer for the group is open or not.

@item n
Select from where.

@item z
A string that looks like @samp{<%s:%n>} if a foreign select method is
used.

@item P
Indentation based on the level of the topic (@pxref{Group Topics}).

@item c
@vindex gnus-group-uncollapsed-levels
Short (collapsed) group name.  The @code{gnus-group-uncollapsed-levels}
variable says how many levels to leave at the end of the group name.
The default is 1---this will mean that group names like
@samp{gnu.emacs.gnus} will be shortened to @samp{g.e.gnus}.

@item m
@vindex gnus-new-mail-mark
@cindex %
@samp{%} (@code{gnus-new-mail-mark}) if there has arrived new mail to
the group lately.

@item p
@samp{#} (@code{gnus-process-mark}) if the group is process marked.

@item d
A string that says when you last read the group (@pxref{Group
Timestamp}).

@item u
User defined specifier.  The next character in the format string should
be a letter.  Gnus will call the function
@code{gnus-user-format-function-}@samp{X}, where @samp{X} is the letter
following @samp{%u}.  The function will be passed a single dummy
parameter as argument.  The function should return a string, which will
be inserted into the buffer just like information from any other
specifier.
@end table

@cindex *
All the number-of'' specs will be filled with an asterisk (@samp{*})
if no info is available---for instance, if it is a non-activated foreign
group, or a bogus native group.

@node Group Mode Line Specification
@subsection Group Mode Line Specification
@cindex group mode line

@vindex gnus-group-mode-line-format
The mode line can be changed by setting
@code{gnus-group-mode-line-format} (@pxref{Mode Line Formatting}).  It
doesn't understand that many format specifiers:

@table @samp
@item S
The native news server.
@item M
The native select method.
@end table

@node Group Highlighting
@subsection Group Highlighting
@cindex highlighting
@cindex group highlighting

@vindex gnus-group-highlight
Highlighting in the group buffer is controlled by the
@code{gnus-group-highlight} variable.  This is an alist with elements
that look like @code{(@var{form} . @var{face})}.  If @var{form} evaluates to
something non-@code{nil}, the @var{face} will be used on the line.

Here's an example value for this variable that might look nice if the
background is dark:

@lisp
(cond (window-system
(setq custom-background-mode 'light)
(defface my-group-face-1
'((t (:foreground "Red" :bold t))) "First group face")
(defface my-group-face-2
'((t (:foreground "DarkSeaGreen4" :bold t)))
"Second group face")
(defface my-group-face-3
'((t (:foreground "Green4" :bold t))) "Third group face")
(defface my-group-face-4
'((t (:foreground "SteelBlue" :bold t))) "Fourth group face")
(defface my-group-face-5
'((t (:foreground "Blue" :bold t))) "Fifth group face")))

(setq gnus-group-highlight
((and (< level 3) (zerop unread)) . my-group-face-2)
((< level 3) . my-group-face-3)
(t . my-group-face-5)))
@end lisp

Also @pxref{Faces and Fonts}.

Variables that are dynamically bound when the forms are evaluated
include:

@table @code
@item group
The group name.
The number of unread articles in the group.
@item method
The select method.
@item mailp
Whether the group is a mail group.
@item level
The level of the group.
@item score
The score of the group.
@item ticked
The number of ticked articles in the group.
@item total
The total number of articles in the group.  Or rather,
@var{max-number} minus @var{min-number} plus one.
@item topic
When using the topic minor mode, this variable is bound to the current
topic being inserted.
@end table

When the forms are @code{eval}ed, point is at the beginning of the line
of the group in question, so you can use many of the normal Gnus
functions for snarfing info on the group.

@vindex gnus-group-update-hook
@findex gnus-group-highlight-line
@code{gnus-group-update-hook} is called when a group line is changed.
It will not be called when @code{gnus-visual} is @code{nil}.  This hook
calls @code{gnus-group-highlight-line} by default.

@node Group Maneuvering
@section Group Maneuvering
@cindex group movement

All movement commands understand the numeric prefix and will behave as
expected, hopefully.

@table @kbd

@item n
@kindex n (Group)
Go to the next group that has unread articles

@item p
@itemx DEL
@kindex DEL (Group)
@kindex p (Group)
Go to the previous group that has unread articles

@item N
@kindex N (Group)
@findex gnus-group-next-group
Go to the next group (@code{gnus-group-next-group}).

@item P
@kindex P (Group)
@findex gnus-group-prev-group
Go to the previous group (@code{gnus-group-prev-group}).

@item M-n
@kindex M-n (Group)
Go to the next unread group on the same (or lower) level

@item M-p
@kindex M-p (Group)
Go to the previous unread group on the same (or lower) level
@end table

Three commands for jumping to groups:

@table @kbd

@item j
@kindex j (Group)
@findex gnus-group-jump-to-group
(@code{gnus-group-jump-to-group}).  Killed groups can be jumped to, just
like living groups.

@item ,
@kindex , (Group)

@item .
@kindex . (Group)
@end table

If @code{gnus-group-goto-unread} is @code{nil}, all the movement
commands will move to the next group, not the next unread group.  Even
the commands that say they move to the next unread group.  The default
is @code{t}.

@node Selecting a Group
@section Selecting a Group
@cindex group selection

@table @kbd

@item SPACE
@kindex SPACE (Group)
Select the current group, switch to the summary buffer and display the
unread articles in the group, or if you give a non-numerical prefix to
this command, Gnus will offer to fetch all the old articles in this
group from the server.  If you give a numerical prefix @var{n}, @var{n}
determines the number of articles Gnus will fetch.  If @var{n} is
positive, Gnus fetches the @var{n} newest articles, if @var{n} is
negative, Gnus fetches the @code{abs(@var{n})} oldest articles.

Thus, @kbd{SPC} enters the group normally, @kbd{C-u SPC} offers old
articles, @kbd{C-u 4 2 SPC} fetches the 42 newest articles, and @kbd{C-u
- 4 2 SPC} fetches the 42 oldest ones.

When you are in the group (in the Summary buffer), you can type
@kbd{M-g} to fetch new articles, or @kbd{C-u M-g} to also show the old
ones.

@item RET
@kindex RET (Group)
@findex gnus-group-select-group
Select the current group and switch to the summary buffer
(@code{gnus-group-select-group}).  Takes the same arguments as
@code{gnus-group-read-group}---the only difference is that this command
does not display the first unread article automatically upon group
entry.

@item M-RET
@kindex M-RET (Group)
@findex gnus-group-quick-select-group
This does the same as the command above, but tries to do it with the
minimum amount of fuzz (@code{gnus-group-quick-select-group}).  No
scoring/killing will be performed, there will be no highlights and no
expunging.  This might be useful if you're in a real hurry and have to
enter some humongous group.  If you give a 0 prefix to this command
(i.e., @kbd{0 M-RET}), Gnus won't even generate the summary buffer,
which is useful if you want to toggle threading before generating the
summary buffer (@pxref{Summary Generation Commands}).

@item M-SPACE
@kindex M-SPACE (Group)
@findex gnus-group-visible-select-group
This is yet one more command that does the same as the @kbd{RET}
command, but this one does it without expunging and hiding dormants
(@code{gnus-group-visible-select-group}).

@item C-M-RET
@kindex C-M-RET (Group)
@findex gnus-group-select-group-ephemerally
Finally, this command selects the current group ephemerally without
doing any processing of its contents
turned off.  Everything you do in the group after selecting it in this
manner will have no permanent effects.

@end table

@vindex gnus-large-newsgroup
The @code{gnus-large-newsgroup} variable says what Gnus should
consider to be a big group.  If it is @code{nil}, no groups are
considered big.  The default value is 200.  If the group has more
(unread and/or ticked) articles than this, Gnus will query the user
before entering the group.  The user can then specify how many
articles should be fetched from the server.  If the user specifies a
negative number (@var{-n}), the @var{n} oldest articles will be
fetched.  If it is positive, the @var{n} articles that have arrived
most recently will be fetched.

@vindex gnus-large-ephemeral-newsgroup
@code{gnus-large-ephemeral-newsgroup} is the same as
@code{gnus-large-newsgroup}, but is only used for ephemeral
newsgroups.

@vindex gnus-select-group-hook
@vindex gnus-auto-select-first
@vindex gnus-auto-select-subject
If @code{gnus-auto-select-first} is non-@code{nil}, select an article
automatically when entering a group with the @kbd{SPACE} command.
Which article this is is controlled by the
@code{gnus-auto-select-subject} variable.  Valid values for this
variable are:

@table @code

Place point on the subject line of the first unread article.

@item first
Place point on the subject line of the first article.

@item unseen
Place point on the subject line of the first unseen article.

Place point on the subject line of the first unseen article, and if
there is no such article, place point on the subject line of the first

@item best
Place point on the subject line of the highest-scored unread article.

@end table

This variable can also be a function.  In that case, that function
will be called to place point on a subject line.

If you want to prevent automatic selection in some group (say, in a
binary group with Huge articles) you can set the
@code{gnus-auto-select-first} variable to @code{nil} in
@code{gnus-select-group-hook}, which is called when a group is
selected.

@node Subscription Commands
@section Subscription Commands
@cindex subscription

@table @kbd

@item S t
@itemx u
@kindex S t (Group)
@kindex u (Group)
@findex gnus-group-unsubscribe-current-group
@c @icon{gnus-group-unsubscribe}
Toggle subscription to the current group
(@code{gnus-group-unsubscribe-current-group}).

@item S s
@itemx U
@kindex S s (Group)
@kindex U (Group)
@findex gnus-group-unsubscribe-group
Prompt for a group to subscribe, and then subscribe it.  If it was
(@code{gnus-group-unsubscribe-group}).

@item S k
@itemx C-k
@kindex S k (Group)
@kindex C-k (Group)
@findex gnus-group-kill-group
@c @icon{gnus-group-kill-group}
Kill the current group (@code{gnus-group-kill-group}).

@item S y
@itemx C-y
@kindex S y (Group)
@kindex C-y (Group)
@findex gnus-group-yank-group
Yank the last killed group (@code{gnus-group-yank-group}).

@item C-x C-t
@kindex C-x C-t (Group)
@findex gnus-group-transpose-groups
Transpose two groups (@code{gnus-group-transpose-groups}).  This isn't
really a subscription command, but you can use it instead of a
kill-and-yank sequence sometimes.

@item S w
@itemx C-w
@kindex S w (Group)
@kindex C-w (Group)
@findex gnus-group-kill-region
Kill all groups in the region (@code{gnus-group-kill-region}).

@item S z
@kindex S z (Group)
@findex gnus-group-kill-all-zombies
Kill all zombie groups (@code{gnus-group-kill-all-zombies}).

@item S C-k
@kindex S C-k (Group)
@findex gnus-group-kill-level
Kill all groups on a certain level (@code{gnus-group-kill-level}).
These groups can't be yanked back after killing, so this command should
be used with some caution.  The only time where this command comes in
really handy is when you have a @file{.newsrc} with lots of unsubscribed
groups that you want to get rid off.  @kbd{S C-k} on level 7 will
kill off all unsubscribed groups that do not have message numbers in the
@file{.newsrc} file.

@end table

Also @pxref{Group Levels}.

@node Group Data
@section Group Data

@table @kbd

@item c
@kindex c (Group)
@findex gnus-group-catchup-current
@vindex gnus-group-catchup-group-hook
@c @icon{gnus-group-catchup-current}
Mark all unticked articles in this group as read
(@code{gnus-group-catchup-current}).
@code{gnus-group-catchup-group-hook} is called when catching up a group from
the group buffer.

@item C
@kindex C (Group)
@findex gnus-group-catchup-current-all
Mark all articles in this group, even the ticked ones, as read
(@code{gnus-group-catchup-current-all}).

@item M-c
@kindex M-c (Group)
@findex gnus-group-clear-data
Clear the data from the current group---nix out marks and the list of

@item M-x gnus-group-clear-data-on-native-groups
@kindex M-x gnus-group-clear-data-on-native-groups
@findex gnus-group-clear-data-on-native-groups
If you have switched from one @acronym{NNTP} server to another, all your marks
and read ranges have become worthless.  You can use this command to
clear out all data that you have on your native groups.  Use with
caution.

@end table

@node Group Levels
@section Group Levels
@cindex group level
@cindex level

All groups have a level of @dfn{subscribedness}.  For instance, if a
group is on level 2, it is more subscribed than a group on level 5.  You
can ask Gnus to just list groups on a given level or lower
(@pxref{Listing Groups}), or to just check for new articles in groups on
a given level or lower (@pxref{Scanning New Messages}).

Remember:  The higher the level of the group, the less important it is.

@table @kbd

@item S l
@kindex S l (Group)
@findex gnus-group-set-current-level
Set the level of the current group.  If a numeric prefix is given, the
next @var{n} groups will have their levels set.  The user will be
prompted for a level.
@end table

@vindex gnus-level-killed
@vindex gnus-level-zombie
@vindex gnus-level-unsubscribed
@vindex gnus-level-subscribed
Gnus considers groups from levels 1 to
@code{gnus-level-subscribed} (inclusive) (default 5) to be subscribed,
@code{gnus-level-subscribed} (exclusive) and
@code{gnus-level-unsubscribed} (inclusive) (default 7) to be
unsubscribed, @code{gnus-level-zombie} to be zombies (walking dead)
(default 8) and @code{gnus-level-killed} to be killed (completely dead)
(default 9).  Gnus treats subscribed and unsubscribed groups exactly the
same, but zombie and killed groups have no information on what articles
groups isn't done because it is nice or clever, it is done purely for
reasons of efficiency.

It is recommended that you keep all your mail groups (if any) on quite
low levels (e.g. 1 or 2).

Maybe the following description of the default behavior of Gnus helps to
understand what these levels are all about.  By default, Gnus shows you
subscribed nonempty groups, but by hitting @kbd{L} you can have it show
empty subscribed groups and unsubscribed groups, too.  Type @kbd{l} to
go back to showing nonempty subscribed groups again.  Thus, unsubscribed
groups are hidden, in a way.

Zombie and killed groups are similar to unsubscribed groups in that they
are hidden by default.  But they are different from subscribed and
unsubscribed groups in that Gnus doesn't ask the news server for
information (number of messages, number of unread messages) on zombie
and killed groups.  Normally, you use @kbd{C-k} to kill the groups you
aren't interested in.  If most groups are killed, Gnus is faster.

Why does Gnus distinguish between zombie and killed groups?  Well, when
a new group arrives on the server, Gnus by default makes it a zombie
group.  This means that you are normally not bothered with new groups,
but you can type @kbd{A z} to get a list of all new groups.  Subscribe
the ones you like and kill the ones you don't want.  (@kbd{A k} shows a
list of killed groups.)

If you want to play with the level variables, you should show some care.
Set them once, and don't touch them ever again.  Better yet, don't touch
them at all unless you know exactly what you're doing.

@vindex gnus-level-default-unsubscribed
@vindex gnus-level-default-subscribed
Two closely related variables are @code{gnus-level-default-subscribed}
(default 3) and @code{gnus-level-default-unsubscribed} (default 6),
which are the levels that new groups will be put on if they are
(un)subscribed.  These two variables should, of course, be inside the
relevant valid ranges.

@vindex gnus-keep-same-level
If @code{gnus-keep-same-level} is non-@code{nil}, some movement commands
will only move to groups of the same level (or lower).  In
particular, going from the last article in one group to the next group
will go to the next group of the same level (or lower).  This might be
handy if you want to read the most important groups before you read the
rest.

If this variable is @code{best}, Gnus will make the next newsgroup the
one with the best level.

@vindex gnus-group-default-list-level
All groups with a level less than or equal to
@code{gnus-group-default-list-level} will be listed in the group buffer
by default.

@vindex gnus-group-list-inactive-groups
If @code{gnus-group-list-inactive-groups} is non-@code{nil}, non-active
groups will be listed along with the unread groups.  This variable is
@code{t} by default.  If it is @code{nil}, inactive groups won't be
listed.

@vindex gnus-group-use-permanent-levels
If @code{gnus-group-use-permanent-levels} is non-@code{nil}, once you
give a level prefix to @kbd{g} or @kbd{l}, all subsequent commands will
use this level as the work'' level.

@vindex gnus-activate-level
Gnus will normally just activate (i. e., query the server about) groups
on level @code{gnus-activate-level} or less.  If you don't want to
activate unsubscribed groups, for instance, you might set this variable
to 5.  The default is 6.

@node Group Score
@section Group Score
@cindex group score
@cindex group rank
@cindex rank

You would normally keep important groups on high levels, but that scheme
is somewhat restrictive.  Don't you wish you could have Gnus sort the
group buffer according to how often you read groups, perhaps?  Within
reason?

This is what @dfn{group score} is for.  You can have Gnus assign a score
to each group through the mechanism described below.  You can then sort
the group buffer based on this score.  Alternatively, you can sort on
score and then level.  (Taken together, the level and the score is
called the @dfn{rank} of the group.  A group that is on level 4 and has
a score of 1 has a higher rank than a group on level 5 that has a score
of 300.  (The level is the most significant part and the score is the
least significant part.))

@findex gnus-summary-bubble-group
If you want groups you read often to get higher scores than groups you
the @code{gnus-summary-exit-hook} hook.  This will result (after
sorting) in a bubbling sort of action.  If you want to see that in
action after each summary exit, you can add
@code{gnus-group-sort-groups-by-rank} or
@code{gnus-group-sort-groups-by-score} to the same hook, but that will
slow things down somewhat.

@node Marking Groups
@section Marking Groups
@cindex marking groups

If you want to perform some command on several groups, and they appear
subsequently in the group buffer, you would normally just give a
numerical prefix to the command.  Most group commands will then do your
bidding on those groups.

However, if the groups are not in sequential order, you can still
perform a command on several groups.  You simply mark the groups first
with the process mark and then execute the command.

@table @kbd

@item #
@kindex # (Group)
@itemx M m
@kindex M m (Group)
@findex gnus-group-mark-group
Set the mark on the current group (@code{gnus-group-mark-group}).

@item M-#
@kindex M-# (Group)
@itemx M u
@kindex M u (Group)
@findex gnus-group-unmark-group
Remove the mark from the current group
(@code{gnus-group-unmark-group}).

@item M U
@kindex M U (Group)
@findex gnus-group-unmark-all-groups
Remove the mark from all groups (@code{gnus-group-unmark-all-groups}).

@item M w
@kindex M w (Group)
@findex gnus-group-mark-region
Mark all groups between point and mark (@code{gnus-group-mark-region}).

@item M b
@kindex M b (Group)
@findex gnus-group-mark-buffer
Mark all groups in the buffer (@code{gnus-group-mark-buffer}).

@item M r
@kindex M r (Group)
@findex gnus-group-mark-regexp
Mark all groups that match some regular expression
(@code{gnus-group-mark-regexp}).
@end table

Also @pxref{Process/Prefix}.

@findex gnus-group-universal-argument
If you want to execute some command on all groups that have been marked
with the process mark, you can use the @kbd{M-&}
(@code{gnus-group-universal-argument}) command.  It will prompt you for
the command to be executed.

@node Foreign Groups
@section Foreign Groups
@cindex foreign groups

Below are some group mode commands for making and editing general foreign
groups, as well as commands to ease the creation of a few
special-purpose groups.  All these commands insert the newly created
groups under point---@code{gnus-subscribe-newsgroup-method} is not
consulted.

Changes from the group editing commands are stored in
@file{~/.newsrc.eld} (@code{gnus-startup-file}).  An alternative is the
variable @code{gnus-parameters}, @xref{Group Parameters}.

@table @kbd

@item G m
@kindex G m (Group)
@findex gnus-group-make-group
@cindex making groups
Make a new group (@code{gnus-group-make-group}).  Gnus will prompt you
for a name, a method and possibly an @dfn{address}.  For an easier way
to subscribe to @acronym{NNTP} groups (@pxref{Browse Foreign Server}).

@item G M
@kindex G M (Group)
Make an ephemeral group (@code{gnus-group-read-ephemeral-group}).  Gnus
will prompt you for a name, a method and an @dfn{address}.

@item G r
@kindex G r (Group)
@findex gnus-group-rename-group
@cindex renaming groups
Rename the current group to something else
(@code{gnus-group-rename-group}).  This is valid only on some
groups---mail groups mostly.  This command might very well be quite slow
on some back ends.

@item G c
@kindex G c (Group)
@cindex customizing
@findex gnus-group-customize
Customize the group parameters (@code{gnus-group-customize}).

@item G e
@kindex G e (Group)
@findex gnus-group-edit-group-method
@cindex renaming groups
Enter a buffer where you can edit the select method of the current
group (@code{gnus-group-edit-group-method}).

@item G p
@kindex G p (Group)
@findex gnus-group-edit-group-parameters
Enter a buffer where you can edit the group parameters
(@code{gnus-group-edit-group-parameters}).

@item G E
@kindex G E (Group)
@findex gnus-group-edit-group
Enter a buffer where you can edit the group info
(@code{gnus-group-edit-group}).

@item G d
@kindex G d (Group)
@findex gnus-group-make-directory-group
@cindex nndir
Make a directory group (@pxref{Directory Groups}).  You will be prompted
for a directory name (@code{gnus-group-make-directory-group}).

@item G h
@kindex G h (Group)
@cindex help group
@findex gnus-group-make-help-group
Make the Gnus help group (@code{gnus-group-make-help-group}).

@item G a
@kindex G a (Group)
@cindex (ding) archive
@cindex archive group
@findex gnus-group-make-archive-group
@vindex gnus-group-archive-directory
@vindex gnus-group-recent-archive-directory
Make a Gnus archive group (@code{gnus-group-make-archive-group}).  By
default a group pointing to the most recent articles will be created
(@code{gnus-group-recent-archive-directory}), but given a prefix, a full
group will be created from @code{gnus-group-archive-directory}.

@item G k
@kindex G k (Group)
@findex gnus-group-make-kiboze-group
@cindex nnkiboze
Make a kiboze group.  You will be prompted for a name, for a regexp to
match groups to be included'' in the kiboze group, and a series of
strings to match on headers (@code{gnus-group-make-kiboze-group}).
@xref{Kibozed Groups}.

@item G D
@kindex G D (Group)
@findex gnus-group-enter-directory
@cindex nneething
Read an arbitrary directory as if it were a newsgroup with the
@code{nneething} back end (@code{gnus-group-enter-directory}).
@xref{Anything Groups}.

@item G f
@kindex G f (Group)
@findex gnus-group-make-doc-group
@cindex ClariNet Briefs
@cindex nndoc
Make a group based on some file or other
(@code{gnus-group-make-doc-group}).  If you give a prefix to this
command, you will be prompted for a file name and a file type.
Currently supported types are @code{mbox}, @code{babyl},
@code{digest}, @code{news}, @code{rnews}, @code{mmdf}, @code{forward},
@code{rfc934}, @code{rfc822-forward}, @code{mime-parts},
@code{standard-digest}, @code{slack-digest}, @code{clari-briefs},
@code{nsmail}, @code{outlook}, @code{oe-dbx}, and @code{mailman}.  If
you run this command without a prefix, Gnus will guess at the file
type.  @xref{Document Groups}.

@item G u
@kindex G u (Group)
@vindex gnus-useful-groups
@findex gnus-group-make-useful-group
Create one of the groups mentioned in @code{gnus-useful-groups}
(@code{gnus-group-make-useful-group}).

@item G w
@kindex G w (Group)
@findex gnus-group-make-web-group
@cindex nnweb
@cindex gmane
Make an ephemeral group based on a web search
(@code{gnus-group-make-web-group}).  If you give a prefix to this
command, make a solid group instead.  You will be prompted for the
search engine type and the search string.  Valid search engine types
@xref{Web Searches}.

If you use the @code{google} search engine, you can limit the search
to a particular group by using a match string like

@item G R
@kindex G R (Group)
Make a group based on an @acronym{RSS} feed
(@code{gnus-group-make-rss-group}).  You will be prompted for an URL.

@item G DEL
@kindex G DEL (Group)
@findex gnus-group-delete-group
This function will delete the current group
(@code{gnus-group-delete-group}).  If given a prefix, this function will
actually delete all the articles in the group, and forcibly remove the
group itself from the face of the Earth.  Use a prefix only if you are
absolutely sure of what you are doing.  This command can't be used on
read-only groups (like @code{nntp} groups), though.

@item G V
@kindex G V (Group)
@findex gnus-group-make-empty-virtual
Make a new, fresh, empty @code{nnvirtual} group
(@code{gnus-group-make-empty-virtual}).  @xref{Virtual Groups}.

@item G v
@kindex G v (Group)
Add the current group to an @code{nnvirtual} group
@end table

methods.

@vindex gnus-activate-foreign-newsgroups
If @code{gnus-activate-foreign-newsgroups} is a positive number,
Gnus will check all foreign groups with this level or lower at startup.
This might take quite a while, especially if you subscribe to lots of
groups from different @acronym{NNTP} servers.  Also @pxref{Group Levels};
@code{gnus-activate-level} also affects activation of foreign
newsgroups.

@node Group Parameters
@section Group Parameters
@cindex group parameters

The group parameters store information local to a particular group.
Here's an example group parameter list:

@example
(auto-expire . t))
@end example

We see that each element consists of a dotted pair''---the thing before
the dot is the key, while the thing after the dot is the value.  All the
parameters have this form @emph{except} local variable specs, which are
not dotted pairs, but proper lists.

Some parameters have correspondent customizable variables, each of which
is an alist of regexps and values.

The following group parameters can be used:

@table @code
Address used by when doing followups and new posts.

@example
@end example

This is primarily useful in mail groups that represent closed mailing
lists---mailing lists where it's expected that everybody that writes to
the mailing list is subscribed to it.  Since using this parameter
ensures that the mail only goes to the mailing list itself, it means

Using @code{to-address} will actually work whether the group is foreign
or not.  Let's say there's a group on the server that is called
@samp{fa.4ad-l}.  This is a real newsgroup, but the server has gotten
the articles from a mail-to-news gateway.  Posting directly to this
group is therefore impossible---you have to send mail to the mailing

@item to-list
@cindex to-list
Address used when doing @kbd{a} in that group.

@example
(to-list . "some@@where.com")
@end example

It is totally ignored
when doing a followup---except that if it is present in a news group,
you'll get mail group semantics when doing @kbd{f}.

If you do an @kbd{a} command in a mail group and you have neither a
@code{to-list} group parameter nor a @code{to-address} group parameter,
then a @code{to-list} group parameter will be added automatically upon
sending the message if @code{gnus-add-to-list} is set to @code{t}.

@findex gnus-mailing-list-mode
@cindex mail list groups
If this variable is set, @code{gnus-mailing-list-mode} is turned on when
entering summary buffer.

@anchor{subscribed}
@item subscribed
@cindex subscribed
@cindex Mail-Followup-To
If this parameter is set to @code{t}, Gnus will consider the
mailing lists you are subscribed to.  Giving Gnus this information is
(only) a first step in getting it to generate correct Mail-Followup-To
headers for your posts to these lists.  The second step is to put the

@lisp
@end lisp

@xref{Mailing Lists, ,Mailing Lists, message, The Message Manual}, for
a complete treatment of available MFT support.

@item visible
@cindex visible
If the group parameter list has the element @code{(visible . t)},
that group will always be visible in the Group buffer, regardless
of whether it has any unread articles.

This parameter cannot be set via @code{gnus-parameters}. See
@code{gnus-permanently-visible-groups} as an alternative.

headers in this group are to be ignored, and for the header to be hidden
can be useful if you're reading a mailing list group where the listserv
itself.  That is broken behavior.  So there!

@item to-group
@cindex to-group
Elements like @code{(to-group . "some.group.name")} means that all
posts in that group will be sent to @code{some.group.name}.

@item newsgroup
@cindex newsgroup
If you have @code{(newsgroup . t)} in the group parameter list, Gnus
will treat all responses as if they were responses to news articles.
This can be useful if you have a mail group that's really a mirror of a
news group.

@item gcc-self
@cindex gcc-self
If @code{(gcc-self . t)} is present in the group parameter list, newly
composed messages will be @code{Gcc}'d to the current group.  If
@code{(gcc-self . none)} is present, no @code{Gcc:} header will be
generated, if @code{(gcc-self . "string")} is present, this string will
be inserted literally as a @code{gcc} header.  This parameter takes
precedence over any default @code{Gcc} rules as described later
(@pxref{Archived Messages}).

@strong{Caveat}: Adding @code{(gcc-self . t)} to the parameter list of
@code{nntp} groups (or the like) isn't valid.  An @code{nntp} server
doesn't accept articles.

@item auto-expire
@cindex auto-expire
@cindex expiring mail
If the group parameter has an element that looks like @code{(auto-expire
. t)}, all articles read will be marked as expirable.  For an
alternative approach, @pxref{Expiring Mail}.

@item total-expire
@cindex total-expire
@cindex expiring mail
If the group parameter has an element that looks like
@code{(total-expire . t)}, all read articles will be put through the
expiry process, even if they are not marked as expirable.  Use with
caution.  Unread, ticked and dormant articles are not eligible for
expiry.

@item expiry-wait
@cindex expiry-wait
@vindex nnmail-expiry-wait-function
If the group parameter has an element that looks like
@code{(expiry-wait . 10)}, this value will override any
@code{nnmail-expiry-wait} and @code{nnmail-expiry-wait-function}
(@pxref{Expiring Mail}) when expiring expirable messages.  The value
can either be a number of days (not necessarily an integer) or the
symbols @code{never} or @code{immediate}.

@item expiry-target
@cindex expiry-target
Where expired messages end up.  This parameter overrides
@code{nnmail-expiry-target}.

@item score-file
@cindex score file group parameter
Elements that look like @code{(score-file . "file")} will make
@file{file} into the current score file for the group in question.  All
interactive score entries will be put into this file.

Elements that look like @code{(adapt-file . "file")} will make
@file{file} into the current adaptive file for the group in question.
All adaptive score entries will be put into this file.

When unsubscribing from a mailing list you should never send the
unsubscription notice to the mailing list itself.  Instead, you'd send

@item display
@cindex display
Elements that look like @code{(display . MODE)} say which articles to
display on entering the group.  Valid values are:

@table @code
@item all

@item an integer
Display the last @var{integer} articles in the group.  This is the same as
entering the group with @kbd{C-u @var{integer}}.

@item default
Display the default visible articles, which normally includes unread and
ticked articles.

@item an array
Display articles that satisfy a predicate.

Here are some examples:

@table @code

@item [not expire]
Display everything except expirable articles.

@item [and (not reply) (not expire)]
Display everything except expirable and articles you've already
responded to.
@end table

The available operators are @code{not}, @code{and} and @code{or}.
@code{killed}, @code{bookmark}, @code{score}, @code{save},
@code{cache}, @code{forward}, @code{unseen} and @code{recent}.

@end table

The @code{display} parameter works by limiting the summary buffer to
the subset specified.  You can pop the limit by using the @kbd{/ w}
command (@pxref{Limiting}).

@item comment
@cindex comment
Elements that look like @code{(comment . "This is a comment")} are
group line (@pxref{Group Line Specification}).

@item charset
@cindex charset
Elements that look like @code{(charset . iso-8859-1)} will make
@code{iso-8859-1} the default charset; that is, the charset that will be
used for all articles that do not specify a charset.

@item ignored-charsets
@cindex ignored-charset
Elements that look like @code{(ignored-charsets x-unknown iso-8859-1)}
will make @code{iso-8859-1} and @code{x-unknown} ignored; that is, the
default charset will be used for decoding articles.

@item posting-style
@cindex posting-style
You can store additional posting style information for this group
here (@pxref{Posting Styles}).  The format is that of an entry in the
@code{gnus-posting-styles} alist, except that there's no regexp matching
the group name (of course).  Style elements in this group parameter will
take precedence over the ones found in @code{gnus-posting-styles}.

For instance, if you want a funky name and signature in this group only,
instead of hacking @code{gnus-posting-styles}, you could put something
like this in the group parameters:

@example
(posting-style
(name "Funky Name")
(signature "Funky Signature"))
@end example

@item post-method
@cindex post-method
If it is set, the value is used as the method for posting message

@item banner
@cindex banner
An item like @code{(banner . @var{regexp})} causes any part of an article
that matches the regular expression @var{regexp} to be stripped.  Instead of
@var{regexp}, you can also use the symbol @code{signature} which strips the
last signature or any of the elements of the alist
@code{gnus-article-banner-alist}.

@item sieve
@cindex sieve
This parameter contains a Sieve test that should match incoming mail
that should be placed in this group.  From this group parameter, a
Sieve @samp{IF} control structure is generated, having the test as the
condition and @samp{fileinto "group.name";} as the body.

For example, if the @samp{INBOX.list.sieve} group has the @code{(sieve
translating the group parameter into a Sieve script (@pxref{Sieve
Commands}) the following Sieve code is generated:

@example
fileinto \"INBOX.list.sieve\";
@}
@end example

The Sieve language is described in RFC 3028.  @xref{Top, Emacs Sieve,
Top, sieve, Emacs Sieve}.

@item (agent parameters)
If the agent has been enabled, you can set any of the its parameters
to control the behavior of the agent in individual groups. See Agent
Parameters in @ref{Category Syntax}.  Most users will choose to set
agent parameters in either an agent category or group topic to
minimize the configuration effort.

@item (@var{variable} @var{form})
You can use the group parameters to set variables local to the group you
you could put @code{(gnus-show-threads nil)} in the group parameters of
in the summary buffer you enter, and the form @code{nil} will be
@code{eval}ed there.

Note that this feature sets the variable locally to the summary buffer.
But some variables are evaluated in the article buffer, or in the
message buffer (of a reply or followup or otherwise newly created
message).  As a workaround, it might help to add the variable in
question to @code{gnus-newsgroup-variables}.  @xref{Various Summary
Stuff}.  So if you want to set @code{message-from-style} via the group
parameters, then you may need the following statement elsewhere in your
@file{~/.gnus} file:

@lisp
@end lisp

@vindex gnus-list-identifiers
A use for this feature is to remove a mailing list identifier tag in
the subject fields of articles.  E.g. if the news group

@example
nntp+news.gnus.org:gmane.text.docbook.apps
@end example

has the tag @samp{DOC-BOOK-APPS:} in the subject of all articles, this
tag can be removed from the article subjects in the summary buffer for
the group by putting @code{(gnus-list-identifiers "DOCBOOK-APPS:")}
into the group parameters for the group.

This can also be used as a group-specific hook function.  If you want to
hear a beep when you enter a group, you could put something like
@code{(dummy-variable (ding))} in the parameters of that group.
@code{dummy-variable} will be set to the (meaningless) result of the
@code{(ding)} form.

Alternatively, since the VARIABLE becomes local to the group, this
pattern can be used to temporarily change a hook.  For example, if the
following is added to a group parameter

@lisp
(gnus-summary-prepared-hook
'(lambda nil (local-set-key "d" (local-key-binding "n"))))
@end lisp

when the group is entered, the 'd' key will not mark the article as
expired.

@end table

Use the @kbd{G p} or the @kbd{G c} command to edit group parameters of a
group.  (@kbd{G p} presents you with a Lisp-based interface, @kbd{G c}
presents you with a Customize-like interface.  The latter helps avoid
silly Lisp errors.)  You might also be interested in reading about topic
parameters (@pxref{Topic Parameters}).

@vindex gnus-parameters
Group parameters can be set via the @code{gnus-parameters} variable too.
But some variables, such as @code{visible}, have no effect (For this
case see @code{gnus-permanently-visible-groups} as an alternative.).
For example:

@lisp
(setq gnus-parameters
'(("mail\\..*"
(gnus-use-scoring nil)
(gnus-summary-line-format
"%U%R%z%I%(%[%d:%ub%-23,23f%]%) %s\n")
(gcc-self . t)
(display . all))

("^nnimap:\$$foo.bar\$$$" (to-group . "\\1")) ("mail\\.me" (gnus-use-scoring t)) ("list\\..*" (total-expire . t) (broken-reply-to . t)))) @end lisp String value of parameters will be subjected to regexp substitution, as the @code{to-group} example shows. @vindex gnus-parameters-case-fold-search By default, whether comparing the group name and one of those regexps specified in @code{gnus-parameters} is done in a case-sensitive manner or a case-insensitive manner depends on the value of @code{case-fold-search} at the time when the comparison is done. The value of @code{case-fold-search} is typically @code{t}; it means, for example, the element @code{("INBOX\\.FOO" (total-expire . t))} might be applied to both the @samp{INBOX.FOO} group and the @samp{INBOX.foo} group. If you want to make those regexps always case-sensitive, set the value of the @code{gnus-parameters-case-fold-search} variable to @code{nil}. Otherwise, set it to @code{t} if you want to compare them always in a case-insensitive manner. @node Listing Groups @section Listing Groups @cindex group listing These commands all list various slices of the groups available. @table @kbd @item l @itemx A s @kindex A s (Group) @kindex l (Group) @findex gnus-group-list-groups List all groups that have unread articles (@code{gnus-group-list-groups}). If the numeric prefix is used, this command will list only groups of level ARG and lower. By default, it only lists groups of level five (i.e., @code{gnus-group-default-list-level}) or lower (i.e., just subscribed groups). @item L @itemx A u @kindex A u (Group) @kindex L (Group) @findex gnus-group-list-all-groups List all groups, whether they have unread articles or not (@code{gnus-group-list-all-groups}). If the numeric prefix is used, this command will list only groups of level ARG and lower. By default, it lists groups of level seven or lower (i.e., just subscribed and unsubscribed groups). @item A l @kindex A l (Group) @findex gnus-group-list-level List all unread groups on a specific level (@code{gnus-group-list-level}). If given a prefix, also list the groups with no unread articles. @item A k @kindex A k (Group) @findex gnus-group-list-killed List all killed groups (@code{gnus-group-list-killed}). If given a prefix argument, really list all groups that are available, but aren't currently (un)subscribed. This could entail reading the active file from the server. @item A z @kindex A z (Group) @findex gnus-group-list-zombies List all zombie groups (@code{gnus-group-list-zombies}). @item A m @kindex A m (Group) @findex gnus-group-list-matching List all unread, subscribed groups with names that match a regexp (@code{gnus-group-list-matching}). @item A M @kindex A M (Group) @findex gnus-group-list-all-matching List groups that match a regexp (@code{gnus-group-list-all-matching}). @item A A @kindex A A (Group) @findex gnus-group-list-active List absolutely all groups in the active file(s) of the server(s) you are connected to (@code{gnus-group-list-active}). This might very well take quite a while. It might actually be a better idea to do a @kbd{A M} to list all matching, and just give @samp{.} as the thing to match on. Also note that this command may list groups that don't exist (yet)---these will be listed as if they were killed groups. Take the output with some grains of salt. @item A a @kindex A a (Group) @findex gnus-group-apropos List all groups that have names that match a regexp (@code{gnus-group-apropos}). @item A d @kindex A d (Group) @findex gnus-group-description-apropos List all groups that have names or descriptions that match a regexp (@code{gnus-group-description-apropos}). @item A c @kindex A c (Group) @findex gnus-group-list-cached List all groups with cached articles (@code{gnus-group-list-cached}). @item A ? @kindex A ? (Group) @findex gnus-group-list-dormant List all groups with dormant articles (@code{gnus-group-list-dormant}). @item A / @kindex A / (Group) @findex gnus-group-list-limit List groups limited within the current selection (@code{gnus-group-list-limit}). @item A f @kindex A f (Group) @findex gnus-group-list-flush Flush groups from the current selection (@code{gnus-group-list-flush}). @item A p @kindex A p (Group) @findex gnus-group-list-plus List groups plus the current selection (@code{gnus-group-list-plus}). @end table @vindex gnus-permanently-visible-groups @cindex visible group parameter Groups that match the @code{gnus-permanently-visible-groups} regexp will always be shown, whether they have unread articles or not. You can also add the @code{visible} element to the group parameters in question to get the same effect. @vindex gnus-list-groups-with-ticked-articles Groups that have just ticked articles in it are normally listed in the group buffer. If @code{gnus-list-groups-with-ticked-articles} is @code{nil}, these groups will be treated just like totally empty groups. It is @code{t} by default. @node Sorting Groups @section Sorting Groups @cindex sorting groups @kindex C-c C-s (Group) @findex gnus-group-sort-groups @vindex gnus-group-sort-function The @kbd{C-c C-s} (@code{gnus-group-sort-groups}) command sorts the group buffer according to the function(s) given by the @code{gnus-group-sort-function} variable. Available sorting functions include: @table @code @item gnus-group-sort-by-alphabet @findex gnus-group-sort-by-alphabet Sort the group names alphabetically. This is the default. @item gnus-group-sort-by-real-name @findex gnus-group-sort-by-real-name Sort the group alphabetically on the real (unprefixed) group names. @item gnus-group-sort-by-level @findex gnus-group-sort-by-level Sort by group level. @item gnus-group-sort-by-score @findex gnus-group-sort-by-score Sort by group score. @xref{Group Score}. @item gnus-group-sort-by-rank @findex gnus-group-sort-by-rank Sort by group score and then the group level. The level and the score are, when taken together, the group's @dfn{rank}. @xref{Group Score}. @item gnus-group-sort-by-unread @findex gnus-group-sort-by-unread Sort by number of unread articles. @item gnus-group-sort-by-method @findex gnus-group-sort-by-method Sort alphabetically on the select method. @item gnus-group-sort-by-server @findex gnus-group-sort-by-server Sort alphabetically on the Gnus server name. @end table @code{gnus-group-sort-function} can also be a list of sorting functions. In that case, the most significant sort key function must be the last one. There are also a number of commands for sorting directly according to some sorting criteria: @table @kbd @item G S a @kindex G S a (Group) @findex gnus-group-sort-groups-by-alphabet Sort the group buffer alphabetically by group name (@code{gnus-group-sort-groups-by-alphabet}). @item G S u @kindex G S u (Group) @findex gnus-group-sort-groups-by-unread Sort the group buffer by the number of unread articles (@code{gnus-group-sort-groups-by-unread}). @item G S l @kindex G S l (Group) @findex gnus-group-sort-groups-by-level Sort the group buffer by group level (@code{gnus-group-sort-groups-by-level}). @item G S v @kindex G S v (Group) @findex gnus-group-sort-groups-by-score Sort the group buffer by group score (@code{gnus-group-sort-groups-by-score}). @xref{Group Score}. @item G S r @kindex G S r (Group) @findex gnus-group-sort-groups-by-rank Sort the group buffer by group rank (@code{gnus-group-sort-groups-by-rank}). @xref{Group Score}. @item G S m @kindex G S m (Group) @findex gnus-group-sort-groups-by-method Sort the group buffer alphabetically by back end name@* (@code{gnus-group-sort-groups-by-method}). @item G S n @kindex G S n (Group) @findex gnus-group-sort-groups-by-real-name Sort the group buffer alphabetically by real (unprefixed) group name (@code{gnus-group-sort-groups-by-real-name}). @end table All the commands below obey the process/prefix convention (@pxref{Process/Prefix}). When given a symbolic prefix (@pxref{Symbolic Prefixes}), all these commands will sort in reverse order. You can also sort a subset of the groups: @table @kbd @item G P a @kindex G P a (Group) @findex gnus-group-sort-selected-groups-by-alphabet Sort the groups alphabetically by group name (@code{gnus-group-sort-selected-groups-by-alphabet}). @item G P u @kindex G P u (Group) @findex gnus-group-sort-selected-groups-by-unread Sort the groups by the number of unread articles (@code{gnus-group-sort-selected-groups-by-unread}). @item G P l @kindex G P l (Group) @findex gnus-group-sort-selected-groups-by-level Sort the groups by group level (@code{gnus-group-sort-selected-groups-by-level}). @item G P v @kindex G P v (Group) @findex gnus-group-sort-selected-groups-by-score Sort the groups by group score (@code{gnus-group-sort-selected-groups-by-score}). @xref{Group Score}. @item G P r @kindex G P r (Group) @findex gnus-group-sort-selected-groups-by-rank Sort the groups by group rank (@code{gnus-group-sort-selected-groups-by-rank}). @xref{Group Score}. @item G P m @kindex G P m (Group) @findex gnus-group-sort-selected-groups-by-method Sort the groups alphabetically by back end name@* (@code{gnus-group-sort-selected-groups-by-method}). @item G P n @kindex G P n (Group) @findex gnus-group-sort-selected-groups-by-real-name Sort the groups alphabetically by real (unprefixed) group name (@code{gnus-group-sort-selected-groups-by-real-name}). @item G P s @kindex G P s (Group) @findex gnus-group-sort-selected-groups Sort the groups according to @code{gnus-group-sort-function}. @end table And finally, note that you can use @kbd{C-k} and @kbd{C-y} to manually move groups around. @node Group Maintenance @section Group Maintenance @cindex bogus groups @table @kbd @item b @kindex b (Group) @findex gnus-group-check-bogus-groups Find bogus groups and delete them (@code{gnus-group-check-bogus-groups}). @item F @kindex F (Group) @findex gnus-group-find-new-groups Find new groups and process them (@code{gnus-group-find-new-groups}). With 1 @kbd{C-u}, use the @code{ask-server} method to query the server for new groups. With 2 @kbd{C-u}'s, use most complete method possible to query the server for new groups, and subscribe the new groups as zombies. @item C-c C-x @kindex C-c C-x (Group) @findex gnus-group-expire-articles @cindex expiring mail Run all expirable articles in the current group through the expiry process (if any) (@code{gnus-group-expire-articles}). That is, delete all expirable articles in the group that have been around for a while. (@pxref{Expiring Mail}). @item C-c C-M-x @kindex C-c C-M-x (Group) @findex gnus-group-expire-all-groups @cindex expiring mail Run all expirable articles in all groups through the expiry process (@code{gnus-group-expire-all-groups}). @end table @node Browse Foreign Server @section Browse Foreign Server @cindex foreign servers @cindex browsing servers @table @kbd @item B @kindex B (Group) @findex gnus-group-browse-foreign-server You will be queried for a select method and a server name. Gnus will then attempt to contact this server and let you browse the groups there (@code{gnus-group-browse-foreign-server}). @end table @findex gnus-browse-mode A new buffer with a list of available groups will appear. This buffer will use the @code{gnus-browse-mode}. This buffer looks a bit (well, a lot) like a normal group buffer. Here's a list of keystrokes available in the browse mode: @table @kbd @item n @kindex n (Browse) @findex gnus-group-next-group Go to the next group (@code{gnus-group-next-group}). @item p @kindex p (Browse) @findex gnus-group-prev-group Go to the previous group (@code{gnus-group-prev-group}). @item SPACE @kindex SPACE (Browse) @findex gnus-browse-read-group Enter the current group and display the first article (@code{gnus-browse-read-group}). @item RET @kindex RET (Browse) @findex gnus-browse-select-group Enter the current group (@code{gnus-browse-select-group}). @item u @kindex u (Browse) @findex gnus-browse-unsubscribe-current-group Unsubscribe to the current group, or, as will be the case here, subscribe to it (@code{gnus-browse-unsubscribe-current-group}). @item l @itemx q @kindex q (Browse) @kindex l (Browse) @findex gnus-browse-exit Exit browse mode (@code{gnus-browse-exit}). @item d @kindex d (Browse) @findex gnus-browse-describe-group Describe the current group (@code{gnus-browse-describe-group}). @item ? @kindex ? (Browse) @findex gnus-browse-describe-briefly Describe browse mode briefly (well, there's not much to describe, is there) (@code{gnus-browse-describe-briefly}). @end table @node Exiting Gnus @section Exiting Gnus @cindex exiting Gnus Yes, Gnus is ex(c)iting. @table @kbd @item z @kindex z (Group) @findex gnus-group-suspend Suspend Gnus (@code{gnus-group-suspend}). This doesn't really exit Gnus, but it kills all buffers except the Group buffer. I'm not sure why this is a gain, but then who am I to judge? @item q @kindex q (Group) @findex gnus-group-exit @c @icon{gnus-group-exit} Quit Gnus (@code{gnus-group-exit}). @item Q @kindex Q (Group) @findex gnus-group-quit Quit Gnus without saving the @file{.newsrc} files (@code{gnus-group-quit}). The dribble file will be saved, though (@pxref{Auto Save}). @end table @vindex gnus-exit-gnus-hook @vindex gnus-suspend-gnus-hook @vindex gnus-after-exiting-gnus-hook @code{gnus-suspend-gnus-hook} is called when you suspend Gnus and @code{gnus-exit-gnus-hook} is called when you quit Gnus, while @code{gnus-after-exiting-gnus-hook} is called as the final item when exiting Gnus. Note: @quotation Miss Lisa Cannifax, while sitting in English class, felt her feet go numbly heavy and herself fall into a hazy trance as the boy sitting behind her drew repeated lines with his pencil across the back of her plastic chair. @end quotation @node Group Topics @section Group Topics @cindex topics If you read lots and lots of groups, it might be convenient to group them hierarchically according to topics. You put your Emacs groups over here, your sex groups over there, and the rest (what, two groups or so?) you put in some misc section that you never bother with anyway. You can even group the Emacs sex groups as a sub-topic to either the Emacs groups or the sex groups---or both! Go wild! @iftex @iflatex \gnusfigure{Group Topics}{400}{ \put(75,50){\epsfig{figure=ps/group-topic,height=9cm}} } @end iflatex @end iftex Here's an example: @example Gnus Emacs -- I wuw it! 3: comp.emacs 2: alt.religion.emacs Naughty Emacs 452: alt.sex.emacs 0: comp.talk.emacs.recovery Misc 8: comp.binaries.fractals 13: comp.sources.unix @end example @findex gnus-topic-mode @kindex t (Group) To get this @emph{fab} functionality you simply turn on (ooh!) the @code{gnus-topic} minor mode---type @kbd{t} in the group buffer. (This is a toggling command.) Go ahead, just try it. I'll still be here when you get back. La de dum@dots{} Nice tune, that@dots{} la la la@dots{} What, you're back? Yes, and now press @kbd{l}. There. All your groups are now listed under @samp{misc}. Doesn't that make you feel all warm and fuzzy? Hot and bothered? If you want this permanently enabled, you should add that minor mode to the hook for the group mode. Put the following line in your @file{~/.gnus.el} file: @lisp (add-hook 'gnus-group-mode-hook 'gnus-topic-mode) @end lisp @menu * Topic Commands:: Interactive E-Z commands. * Topic Variables:: How to customize the topics the Lisp Way. * Topic Sorting:: Sorting each topic individually. * Topic Topology:: A map of the world. * Topic Parameters:: Parameters that apply to all groups in a topic. @end menu @node Topic Commands @subsection Topic Commands @cindex topic commands When the topic minor mode is turned on, a new @kbd{T} submap will be available. In addition, a few of the standard keys change their definitions slightly. In general, the following kinds of operations are possible on topics. First of all, you want to create topics. Secondly, you want to put groups in topics and to move them around until you have an order you like. The third kind of operation is to show/hide parts of the whole shebang. You might want to hide a topic including its subtopics and groups, to get a better overview of the other groups. Here is a list of the basic keys that you might need to set up topics the way you like. @table @kbd @item T n @kindex T n (Topic) @findex gnus-topic-create-topic Prompt for a new topic name and create it (@code{gnus-topic-create-topic}). @item T TAB @itemx TAB @kindex T TAB (Topic) @kindex TAB (Topic) @findex gnus-topic-indent Indent'' the current topic so that it becomes a sub-topic of the previous topic (@code{gnus-topic-indent}). If given a prefix, un-indent'' the topic instead. @item M-TAB @kindex M-TAB (Topic) @findex gnus-topic-unindent Un-indent'' the current topic so that it becomes a sub-topic of the parent of its current parent (@code{gnus-topic-unindent}). @end table The following two keys can be used to move groups and topics around. They work like the well-known cut and paste. @kbd{C-k} is like cut and @kbd{C-y} is like paste. Of course, this being Emacs, we use the terms kill and yank rather than cut and paste. @table @kbd @item C-k @kindex C-k (Topic) @findex gnus-topic-kill-group Kill a group or topic (@code{gnus-topic-kill-group}). All groups in the topic will be removed along with the topic. @item C-y @kindex C-y (Topic) @findex gnus-topic-yank-group Yank the previously killed group or topic (@code{gnus-topic-yank-group}). Note that all topics will be yanked before all groups. So, to move a topic to the beginning of the list of topics, just hit @kbd{C-k} on it. This is like the cut'' part of cut and paste. Then, move the cursor to the beginning of the buffer (just below the Gnus'' topic) and hit @kbd{C-y}. This is like the paste'' part of cut and paste. Like I said -- E-Z. You can use @kbd{C-k} and @kbd{C-y} on groups as well as on topics. So you can move topics around as well as groups. @end table After setting up the topics the way you like them, you might wish to hide a topic, or to show it again. That's why we have the following key. @table @kbd @item RET @kindex RET (Topic) @findex gnus-topic-select-group @itemx SPACE Either select a group or fold a topic (@code{gnus-topic-select-group}). When you perform this command on a group, you'll enter the group, as usual. When done on a topic line, the topic will be folded (if it was visible) or unfolded (if it was folded already). So it's basically a toggling command on topics. In addition, if you give a numerical prefix, group on that level (and lower) will be displayed. @end table Now for a list of other commands, in no particular order. @table @kbd @item T m @kindex T m (Topic) @findex gnus-topic-move-group Move the current group to some other topic (@code{gnus-topic-move-group}). This command uses the process/prefix convention (@pxref{Process/Prefix}). @item T j @kindex T j (Topic) @findex gnus-topic-jump-to-topic Go to a topic (@code{gnus-topic-jump-to-topic}). @item T c @kindex T c (Topic) @findex gnus-topic-copy-group Copy the current group to some other topic (@code{gnus-topic-copy-group}). This command uses the process/prefix convention (@pxref{Process/Prefix}). @item T h @kindex T h (Topic) @findex gnus-topic-hide-topic Hide the current topic (@code{gnus-topic-hide-topic}). If given a prefix, hide the topic permanently. @item T s @kindex T s (Topic) @findex gnus-topic-show-topic Show the current topic (@code{gnus-topic-show-topic}). If given a prefix, show the topic permanently. @item T D @kindex T D (Topic) @findex gnus-topic-remove-group Remove a group from the current topic (@code{gnus-topic-remove-group}). This command is mainly useful if you have the same group in several topics and wish to remove it from one of the topics. You may also remove a group from all topics, but in that case, Gnus will add it to the root topic the next time you start Gnus. In fact, all new groups (which, naturally, don't belong to any topic) will show up in the root topic. This command uses the process/prefix convention (@pxref{Process/Prefix}). @item T M @kindex T M (Topic) @findex gnus-topic-move-matching Move all groups that match some regular expression to a topic (@code{gnus-topic-move-matching}). @item T C @kindex T C (Topic) @findex gnus-topic-copy-matching Copy all groups that match some regular expression to a topic (@code{gnus-topic-copy-matching}). @item T H @kindex T H (Topic) @findex gnus-topic-toggle-display-empty-topics Toggle hiding empty topics (@code{gnus-topic-toggle-display-empty-topics}). @item T # @kindex T # (Topic) @findex gnus-topic-mark-topic Mark all groups in the current topic with the process mark (@code{gnus-topic-mark-topic}). This command works recursively on sub-topics unless given a prefix. @item T M-# @kindex T M-# (Topic) @findex gnus-topic-unmark-topic Remove the process mark from all groups in the current topic (@code{gnus-topic-unmark-topic}). This command works recursively on sub-topics unless given a prefix. @item C-c C-x @kindex C-c C-x (Topic) @findex gnus-topic-expire-articles @cindex expiring mail Run all expirable articles in the current group or topic through the expiry process (if any) (@code{gnus-topic-expire-articles}). (@pxref{Expiring Mail}). @item T r @kindex T r (Topic) @findex gnus-topic-rename Rename a topic (@code{gnus-topic-rename}). @item T DEL @kindex T DEL (Topic) @findex gnus-topic-delete Delete an empty topic (@code{gnus-topic-delete}). @item A T @kindex A T (Topic) @findex gnus-topic-list-active List all groups that Gnus knows about in a topics-ified way (@code{gnus-topic-list-active}). @item T M-n @kindex T M-n (Topic) @findex gnus-topic-goto-next-topic Go to the next topic (@code{gnus-topic-goto-next-topic}). @item T M-p @kindex T M-p (Topic) @findex gnus-topic-goto-previous-topic Go to the next topic (@code{gnus-topic-goto-previous-topic}). @item G p @kindex G p (Topic) @findex gnus-topic-edit-parameters @cindex group parameters @cindex topic parameters @cindex parameters Edit the topic parameters (@code{gnus-topic-edit-parameters}). @xref{Topic Parameters}. @end table @node Topic Variables @subsection Topic Variables @cindex topic variables The previous section told you how to tell Gnus which topics to display. This section explains how to tell Gnus what to display about each topic. @vindex gnus-topic-line-format The topic lines themselves are created according to the @code{gnus-topic-line-format} variable (@pxref{Formatting Variables}). Valid elements are: @table @samp @item i Indentation. @item n Topic name. @item v Visibility. @item l Level. @item g Number of groups in the topic. @item a Number of unread articles in the topic. @item A Number of unread articles in the topic and all its subtopics. @end table @vindex gnus-topic-indent-level Each sub-topic (and the groups in the sub-topics) will be indented with @code{gnus-topic-indent-level} times the topic level number of spaces. The default is 2. @vindex gnus-topic-mode-hook @code{gnus-topic-mode-hook} is called in topic minor mode buffers. @vindex gnus-topic-display-empty-topics The @code{gnus-topic-display-empty-topics} says whether to display even topics that have no unread articles in them. The default is @code{t}. @node Topic Sorting @subsection Topic Sorting @cindex topic sorting You can sort the groups in each topic individually with the following commands: @table @kbd @item T S a @kindex T S a (Topic) @findex gnus-topic-sort-groups-by-alphabet Sort the current topic alphabetically by group name (@code{gnus-topic-sort-groups-by-alphabet}). @item T S u @kindex T S u (Topic) @findex gnus-topic-sort-groups-by-unread Sort the current topic by the number of unread articles (@code{gnus-topic-sort-groups-by-unread}). @item T S l @kindex T S l (Topic) @findex gnus-topic-sort-groups-by-level Sort the current topic by group level (@code{gnus-topic-sort-groups-by-level}). @item T S v @kindex T S v (Topic) @findex gnus-topic-sort-groups-by-score Sort the current topic by group score (@code{gnus-topic-sort-groups-by-score}). @xref{Group Score}. @item T S r @kindex T S r (Topic) @findex gnus-topic-sort-groups-by-rank Sort the current topic by group rank (@code{gnus-topic-sort-groups-by-rank}). @xref{Group Score}. @item T S m @kindex T S m (Topic) @findex gnus-topic-sort-groups-by-method Sort the current topic alphabetically by back end name (@code{gnus-topic-sort-groups-by-method}). @item T S e @kindex T S e (Topic) @findex gnus-topic-sort-groups-by-server Sort the current topic alphabetically by server name (@code{gnus-topic-sort-groups-by-server}). @item T S s @kindex T S s (Topic) @findex gnus-topic-sort-groups Sort the current topic according to the function(s) given by the @code{gnus-group-sort-function} variable (@code{gnus-topic-sort-groups}). @end table When given a prefix argument, all these commands will sort in reverse order. @xref{Sorting Groups}, for more information about group sorting. @node Topic Topology @subsection Topic Topology @cindex topic topology @cindex topology So, let's have a look at an example group buffer: @example @group Gnus Emacs -- I wuw it! 3: comp.emacs 2: alt.religion.emacs Naughty Emacs 452: alt.sex.emacs 0: comp.talk.emacs.recovery Misc 8: comp.binaries.fractals 13: comp.sources.unix @end group @end example So, here we have one top-level topic (@samp{Gnus}), two topics under that, and one sub-topic under one of the sub-topics. (There is always just one (1) top-level topic). This topology can be expressed as follows: @lisp (("Gnus" visible) (("Emacs -- I wuw it!" visible) (("Naughty Emacs" visible))) (("Misc" visible))) @end lisp @vindex gnus-topic-topology This is in fact how the variable @code{gnus-topic-topology} would look for the display above. That variable is saved in the @file{.newsrc.eld} file, and shouldn't be messed with manually---unless you really want to. Since this variable is read from the @file{.newsrc.eld} file, setting it in any other startup files will have no effect. This topology shows what topics are sub-topics of what topics (right), and which topics are visible. Two settings are currently allowed---@code{visible} and @code{invisible}. @node Topic Parameters @subsection Topic Parameters @cindex topic parameters All groups in a topic will inherit group parameters from the parent (and ancestor) topic parameters. All valid group parameters are valid topic parameters (@pxref{Group Parameters}). When the agent is enabled, all agent parameters (See Agent Parameters in @ref{Category Syntax}) are also valid topic parameters. In addition, the following parameters are only valid as topic parameters: @table @code @item subscribe When subscribing new groups by topic (@pxref{Subscription Methods}), the @code{subscribe} topic parameter says what groups go in what topic. Its value should be a regexp to match the groups that should go in that topic. @item subscribe-level When subscribing new groups by topic (see the @code{subscribe} parameter), the group will be subscribed with the level specified in the @code{subscribe-level} instead of @code{gnus-level-default-subscribed}. @end table Group parameters (of course) override topic parameters, and topic parameters in sub-topics override topic parameters in super-topics. You know. Normal inheritance rules. (@dfn{Rules} is here a noun, not a verb, although you may feel free to disagree with me here.) @example @group Gnus Emacs 3: comp.emacs 2: alt.religion.emacs 452: alt.sex.emacs Relief 452: alt.sex.emacs 0: comp.talk.emacs.recovery Misc 8: comp.binaries.fractals 13: comp.sources.unix 452: alt.sex.emacs @end group @end example The @samp{Emacs} topic has the topic parameter @code{(score-file . "emacs.SCORE")}; the @samp{Relief} topic has the topic parameter @code{(score-file . "relief.SCORE")}; and the @samp{Misc} topic has the topic parameter @code{(score-file . "emacs.SCORE")}. In addition, @* @samp{alt.religion.emacs} has the group parameter @code{(score-file . "religion.SCORE")}. Now, when you enter @samp{alt.sex.emacs} in the @samp{Relief} topic, you will get the @file{relief.SCORE} home score file. If you enter the same group in the @samp{Emacs} topic, you'll get the @file{emacs.SCORE} home score file. If you enter the group @samp{alt.religion.emacs}, you'll get the @file{religion.SCORE} home score file. This seems rather simple and self-evident, doesn't it? Well, yes. But there are some problems, especially with the @code{total-expiry} parameter. Say you have a mail group in two topics; one with @code{total-expiry} and one without. What happens when you do @kbd{M-x gnus-expire-all-expirable-groups}? Gnus has no way of telling which one of these topics you mean to expire articles from, so anything may happen. In fact, I hereby declare that it is @dfn{undefined} what happens. You just have to be careful if you do stuff like that. @node Misc Group Stuff @section Misc Group Stuff @menu * Scanning New Messages:: Asking Gnus to see whether new messages have arrived. * Group Information:: Information and help on groups and Gnus. * Group Timestamp:: Making Gnus keep track of when you last read a group. * File Commands:: Reading and writing the Gnus files. * Sieve Commands:: Managing Sieve scripts. @end menu @table @kbd @item v @kindex v (Group) @cindex keys, reserved for users (Group) The key @kbd{v} is reserved for users. You can bind it key to some function or better use it as a prefix key. For example: @lisp (define-key gnus-group-mode-map (kbd "v j d") (lambda () (interactive) (gnus-group-jump-to-group "nndraft:drafts"))) @end lisp On keys reserved for users in Emacs and on keybindings in general @xref{Keymaps, Keymaps, , emacs, The Emacs Editor}. @item ^ @kindex ^ (Group) @findex gnus-group-enter-server-mode Enter the server buffer (@code{gnus-group-enter-server-mode}). @xref{Server Buffer}. @item a @kindex a (Group) @findex gnus-group-post-news Start composing a message (a news by default) (@code{gnus-group-post-news}). If given a prefix, post to the group under the point. If the prefix is 1, prompt for a group to post to. Contrary to what the name of this function suggests, the prepared article might be a mail instead of a news, if a mail group is specified with the prefix argument. @xref{Composing Messages}. @item m @kindex m (Group) @findex gnus-group-mail Mail a message somewhere (@code{gnus-group-mail}). If given a prefix, use the posting style of the group under the point. If the prefix is 1, prompt for a group name to find the posting style. @xref{Composing Messages}. @item i @kindex i (Group) @findex gnus-group-news Start composing a news (@code{gnus-group-news}). If given a prefix, post to the group under the point. If the prefix is 1, prompt for group to post to. @xref{Composing Messages}. This function actually prepares a news even when using mail groups. This is useful for posting'' messages to mail groups without actually sending them over the network: they're just saved directly to the group in question. The corresponding back end must have a request-post method for this to work though. @end table Variables for the group buffer: @table @code @item gnus-group-mode-hook @vindex gnus-group-mode-hook is called after the group buffer has been created. @item gnus-group-prepare-hook @vindex gnus-group-prepare-hook is called after the group buffer is generated. It may be used to modify the buffer in some strange, unnatural way. @item gnus-group-prepared-hook @vindex gnus-group-prepare-hook is called as the very last thing after the group buffer has been generated. It may be used to move point around, for instance. @item gnus-permanently-visible-groups @vindex gnus-permanently-visible-groups Groups matching this regexp will always be listed in the group buffer, whether they are empty or not. @item gnus-group-name-charset-method-alist @vindex gnus-group-name-charset-method-alist An alist of method and the charset for group names. It is used to show non-@acronym{ASCII} group names. For example: @lisp (setq gnus-group-name-charset-method-alist '(((nntp "news.com.cn") . cn-gb-2312))) @end lisp @item gnus-group-name-charset-group-alist @cindex UTF-8 group names @vindex gnus-group-name-charset-group-alist An alist of regexp of group name and the charset for group names. It is used to show non-@acronym{ASCII} group names. @code{((".*" utf-8))} is the default value if UTF-8 is supported, otherwise the default is @code{nil}. For example: @lisp (setq gnus-group-name-charset-group-alist '(("\\.com\\.cn:" . cn-gb-2312))) @end lisp @end table @node Scanning New Messages @subsection Scanning New Messages @cindex new messages @cindex scanning new news @table @kbd @item g @kindex g (Group) @findex gnus-group-get-new-news @c @icon{gnus-group-get-new-news} Check the server(s) for new articles. If the numerical prefix is used, this command will check only groups of level @var{arg} and lower (@code{gnus-group-get-new-news}). If given a non-numerical prefix, this command will force a total re-reading of the active file(s) from the back end(s). @item M-g @kindex M-g (Group) @findex gnus-group-get-new-news-this-group @vindex gnus-goto-next-group-when-activating @c @icon{gnus-group-get-new-news-this-group} Check whether new articles have arrived in the current group (@code{gnus-group-get-new-news-this-group}). @code{gnus-goto-next-group-when-activating} says whether this command is to move point to the next group or not. It is @code{t} by default. @findex gnus-activate-all-groups @cindex activating groups @item C-c M-g @kindex C-c M-g (Group) Activate absolutely all groups (@code{gnus-activate-all-groups}). @item R @kindex R (Group) @cindex restarting @findex gnus-group-restart Restart Gnus (@code{gnus-group-restart}). This saves the @file{.newsrc} file(s), closes the connection to all servers, clears up all run-time Gnus variables, and then starts Gnus all over again. @end table @vindex gnus-get-new-news-hook @code{gnus-get-new-news-hook} is run just before checking for new news. @vindex gnus-after-getting-new-news-hook @code{gnus-after-getting-new-news-hook} is run after checking for new news. @node Group Information @subsection Group Information @cindex group information @cindex information on groups @table @kbd @item H f @kindex H f (Group) @findex gnus-group-fetch-faq @vindex gnus-group-faq-directory @cindex FAQ @cindex ange-ftp Try to fetch the @acronym{FAQ} for the current group (@code{gnus-group-fetch-faq}). Gnus will try to get the @acronym{FAQ} from @code{gnus-group-faq-directory}, which is usually a directory on a remote machine. This variable can also be a list of directories. In that case, giving a prefix to this command will allow you to choose between the various sites. @code{ange-ftp} (or @code{efs}) will be used for fetching the file. If fetching from the first site is unsuccessful, Gnus will attempt to go through @code{gnus-group-faq-directory} and try to open them one by one. @item H c @kindex H c (Group) @findex gnus-group-fetch-charter @vindex gnus-group-charter-alist @cindex charter Try to open the charter for the current group in a web browser (@code{gnus-group-fetch-charter}). Query for a group if given a prefix argument. Gnus will use @code{gnus-group-charter-alist} to find the location of the charter. If no location is known, Gnus will fetch the control messages for the group, which in some cases includes the charter. @item H C @kindex H C (Group) @findex gnus-group-fetch-control @vindex gnus-group-fetch-control-use-browse-url @cindex control message Fetch the control messages for the group from the archive at @code{ftp.isc.org} (@code{gnus-group-fetch-control}). Query for a group if given a prefix argument. If @code{gnus-group-fetch-control-use-browse-url} is non-@code{nil}, Gnus will open the control messages in a browser using @code{browse-url}. Otherwise they are fetched using @code{ange-ftp} and displayed in an ephemeral group. Note that the control messages are compressed. To use this command you need to turn on @code{auto-compression-mode} (@pxref{Compressed Files, ,Compressed Files, emacs, The Emacs Manual}). @item H d @itemx C-c C-d @c @icon{gnus-group-describe-group} @kindex H d (Group) @kindex C-c C-d (Group) @cindex describing groups @cindex group description @findex gnus-group-describe-group Describe the current group (@code{gnus-group-describe-group}). If given a prefix, force Gnus to re-read the description from the server. @item M-d @kindex M-d (Group) @findex gnus-group-describe-all-groups Describe all groups (@code{gnus-group-describe-all-groups}). If given a prefix, force Gnus to re-read the description file from the server. @item H v @itemx V @kindex V (Group) @kindex H v (Group) @cindex version @findex gnus-version Display current Gnus version numbers (@code{gnus-version}). @item ? @kindex ? (Group) @findex gnus-group-describe-briefly Give a very short help message (@code{gnus-group-describe-briefly}). @item C-c C-i @kindex C-c C-i (Group) @cindex info @cindex manual @findex gnus-info-find-node Go to the Gnus info node (@code{gnus-info-find-node}). @end table @node Group Timestamp @subsection Group Timestamp @cindex timestamps @cindex group timestamps It can be convenient to let Gnus keep track of when you last read a group. To set the ball rolling, you should add @code{gnus-group-set-timestamp} to @code{gnus-select-group-hook}: @lisp (add-hook 'gnus-select-group-hook 'gnus-group-set-timestamp) @end lisp After doing this, each time you enter a group, it'll be recorded. This information can be displayed in various ways---the easiest is to use the @samp{%d} spec in the group line format: @lisp (setq gnus-group-line-format "%M\%S\%p\%P\%5y: %(%-40,40g%) %d\n") @end lisp This will result in lines looking like: @example * 0: mail.ding 19961002T012943 0: custom 19961002T012713 @end example As you can see, the date is displayed in compact ISO 8601 format. This may be a bit too much, so to just display the date, you could say something like: @lisp (setq gnus-group-line-format "%M\%S\%p\%P\%5y: %(%-40,40g%) %6,6~(cut 2)d\n") @end lisp If you would like greater control of the time format, you can use a user-defined format spec. Something like the following should do the trick: @lisp (setq gnus-group-line-format "%M\%S\%p\%P\%5y: %(%-40,40g%) %ud\n") (defun gnus-user-format-function-d (headers) (let ((time (gnus-group-timestamp gnus-tmp-group))) (if time (format-time-string "%b %d %H:%M" time) ""))) @end lisp @node File Commands @subsection File Commands @cindex file commands @table @kbd @item r @kindex r (Group) @findex gnus-group-read-init-file @vindex gnus-init-file @cindex reading init file Re-read the init file (@code{gnus-init-file}, which defaults to @file{~/.gnus.el}) (@code{gnus-group-read-init-file}). @item s @kindex s (Group) @findex gnus-group-save-newsrc @cindex saving .newsrc Save the @file{.newsrc.eld} file (and @file{.newsrc} if wanted) (@code{gnus-group-save-newsrc}). If given a prefix, force saving the file(s) whether Gnus thinks it is necessary or not. @c @item Z @c @kindex Z (Group) @c @findex gnus-group-clear-dribble @c Clear the dribble buffer (@code{gnus-group-clear-dribble}). @end table @node Sieve Commands @subsection Sieve Commands @cindex group sieve commands Sieve is a server-side mail filtering language. In Gnus you can use the @code{sieve} group parameter (@pxref{Group Parameters}) to specify sieve rules that should apply to each group. Gnus provides two commands to translate all these group parameters into a proper Sieve script that can be transfered to the server somehow. @vindex gnus-sieve-file @vindex gnus-sieve-region-start @vindex gnus-sieve-region-end The generated Sieve script is placed in @code{gnus-sieve-file} (by default @file{~/.sieve}). The Sieve code that Gnus generate is placed between two delimiters, @code{gnus-sieve-region-start} and @code{gnus-sieve-region-end}, so you may write additional Sieve code outside these delimiters that will not be removed the next time you regenerate the Sieve script. @vindex gnus-sieve-crosspost The variable @code{gnus-sieve-crosspost} controls how the Sieve script is generated. If it is non-@code{nil} (the default) articles is placed in all groups that have matching rules, otherwise the article is only placed in the group with the first matching rule. For example, the group parameter @samp{(sieve address "sender" "owner-ding@@hpc.uh.edu")} will generate the following piece of Sieve code if @code{gnus-sieve-crosspost} is @code{nil}. (When @code{gnus-sieve-crosspost} is non-@code{nil}, it looks the same except that the line containing the call to @code{stop} is removed.) @example if address "sender" "owner-ding@@hpc.uh.edu" @{ fileinto "INBOX.ding"; stop; @} @end example @xref{Top, Emacs Sieve, Top, sieve, Emacs Sieve}. @table @kbd @item D g @kindex D g (Group) @findex gnus-sieve-generate @vindex gnus-sieve-file @cindex generating sieve script Regenerate a Sieve script from the @code{sieve} group parameters and put you into the @code{gnus-sieve-file} without saving it. @item D u @kindex D u (Group) @findex gnus-sieve-update @vindex gnus-sieve-file @cindex updating sieve script Regenerates the Gnus managed part of @code{gnus-sieve-file} using the @code{sieve} group parameters, save the file and upload it to the server using the @code{sieveshell} program. @end table @node Summary Buffer @chapter Summary Buffer @cindex summary buffer A line for each article is displayed in the summary buffer. You can move around, read articles, post articles and reply to articles. The most common way to a summary buffer is to select a group from the group buffer (@pxref{Selecting a Group}). You can have as many summary buffers open as you wish. You can customize the Summary Mode tool bar, see @kbd{M-x customize-apropos RET gnus-summary-tool-bar}. This feature is only available in Emacs. @kindex v (Summary) @cindex keys, reserved for users (Summary) The key @kbd{v} is reserved for users. You can bind it key to some function or better use it as a prefix key. For example: @lisp (define-key gnus-summary-mode-map (kbd "v -") "LrS") ;; lower subthread @end lisp @menu * Summary Buffer Format:: Deciding how the summary buffer is to look. * Summary Maneuvering:: Moving around the summary buffer. * Choosing Articles:: Reading articles. * Paging the Article:: Scrolling the current article. * Reply Followup and Post:: Posting articles. * Delayed Articles:: Send articles at a later time. * Marking Articles:: Marking articles as read, expirable, etc. * Limiting:: You can limit the summary buffer. * Threading:: How threads are made. * Sorting the Summary Buffer:: How articles and threads are sorted. * Asynchronous Fetching:: Gnus might be able to pre-fetch articles. * Article Caching:: You may store articles in a cache. * Persistent Articles:: Making articles expiry-resistant. * Article Backlog:: Having already read articles hang around. * Saving Articles:: Ways of customizing article saving. * Decoding Articles:: Gnus can treat series of (uu)encoded articles. * Article Treatment:: The article buffer can be mangled at will. * MIME Commands:: Doing MIMEy things with the articles. * Charsets:: Character set issues. * Article Commands:: Doing various things with the article buffer. * Summary Sorting:: Sorting the summary buffer in various ways. * Finding the Parent:: No child support? Get the parent. * Alternative Approaches:: Reading using non-default summaries. * Tree Display:: A more visual display of threads. * Mail Group Commands:: Some commands can only be used in mail groups. * Various Summary Stuff:: What didn't fit anywhere else. * Exiting the Summary Buffer:: Returning to the Group buffer, or reselecting the current group. * Crosspost Handling:: How crossposted articles are dealt with. * Duplicate Suppression:: An alternative when crosspost handling fails. * Security:: Decrypt and Verify. * Mailing List:: Mailing list minor mode. @end menu @node Summary Buffer Format @section Summary Buffer Format @cindex summary buffer format @iftex @iflatex \gnusfigure{The Summary Buffer}{180}{ \put(0,0){\epsfig{figure=ps/summary,width=7.5cm}} \put(445,0){\makebox(0,0)[br]{\epsfig{figure=ps/summary-article,width=7.5cm}}} } @end iflatex @end iftex @menu * Summary Buffer Lines:: You can specify how summary lines should look. * To From Newsgroups:: How to not display your own name. * Summary Buffer Mode Line:: You can say how the mode line should look. * Summary Highlighting:: Making the summary buffer all pretty and nice. @end menu @findex mail-extract-address-components @findex gnus-extract-address-components @vindex gnus-extract-address-components Gnus will use the value of the @code{gnus-extract-address-components} variable as a function for getting the name and address parts of a @code{From} header. Two pre-defined functions exist: @code{gnus-extract-address-components}, which is the default, quite fast, and too simplistic solution; and @code{mail-extract-address-components}, which works very nicely, but is slower. The default function will return the wrong answer in 5% of the cases. If this is unacceptable to you, use the other function instead: @lisp (setq gnus-extract-address-components 'mail-extract-address-components) @end lisp @vindex gnus-summary-same-subject @code{gnus-summary-same-subject} is a string indicating that the current article has the same subject as the previous. This string will be used with those specs that require it. The default is @code{""}. @node Summary Buffer Lines @subsection Summary Buffer Lines @vindex gnus-summary-line-format You can change the format of the lines in the summary buffer by changing the @code{gnus-summary-line-format} variable. It works along the same lines as a normal @code{format} string, with some extensions (@pxref{Formatting Variables}). There should always be a colon or a point position marker on the line; the cursor always moves to the point position marker or the colon after performing an operation. (Of course, Gnus wouldn't be Gnus if it wasn't possible to change this. Just write a new function @code{gnus-goto-colon} which does whatever you like with the cursor.) @xref{Positioning Point}. The default string is @samp{%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n}. The following format specification characters and extended format specification(s) are understood: @table @samp @item N Article number. @item S Subject string. List identifiers stripped, @code{gnus-list-identifiers}. @xref{Article Hiding}. @item s Subject if the article is the root of the thread or the previous article had a different subject, @code{gnus-summary-same-subject} otherwise. (@code{gnus-summary-same-subject} defaults to @code{""}.) @item F Full @code{From} header. @item n The name (from the @code{From} header). @item f The name, @code{To} header or the @code{Newsgroups} header (@pxref{To From Newsgroups}). @item a The name (from the @code{From} header). This differs from the @code{n} spec in that it uses the function designated by the @code{gnus-extract-address-components} variable, which is slower, but may be more thorough. @item A The address (from the @code{From} header). This works the same way as the @code{a} spec. @item L Number of lines in the article. @item c Number of characters in the article. This specifier is not supported in some methods (like nnfolder). @item k Pretty-printed version of the number of characters in the article; for example, @samp{1.2k} or @samp{0.4M}. @item I Indentation based on thread level (@pxref{Customizing Threading}). @item B A complex trn-style thread tree, showing response-connecting trace lines. A thread could be drawn like this: @example > +-> | +-> | | \-> | | \-> | \-> +-> \-> @end example You can customize the appearance with the following options. Note that it is possible to make the thread display look really neat by replacing the default @acronym{ASCII} characters with graphic line-drawing glyphs. @table @code @item gnus-sum-thread-tree-root @vindex gnus-sum-thread-tree-root Used for the root of a thread. If @code{nil}, use subject instead. The default is @samp{> }. @item gnus-sum-thread-tree-false-root @vindex gnus-sum-thread-tree-false-root Used for the false root of a thread (@pxref{Loose Threads}). If @code{nil}, use subject instead. The default is @samp{> }. @item gnus-sum-thread-tree-single-indent @vindex gnus-sum-thread-tree-single-indent Used for a thread with just one message. If @code{nil}, use subject instead. The default is @samp{}. @item gnus-sum-thread-tree-vertical @vindex gnus-sum-thread-tree-vertical Used for drawing a vertical line. The default is @samp{| }. @item gnus-sum-thread-tree-indent @vindex gnus-sum-thread-tree-indent Used for indenting. The default is @samp{ }. @item gnus-sum-thread-tree-leaf-with-other @vindex gnus-sum-thread-tree-leaf-with-other Used for a leaf with brothers. The default is @samp{+-> }. @item gnus-sum-thread-tree-single-leaf @vindex gnus-sum-thread-tree-single-leaf Used for a leaf without brothers. The default is @samp{\-> } @end table @item T Nothing if the article is a root and lots of spaces if it isn't (it pushes everything after it off the screen). @item [ Opening bracket, which is normally @samp{[}, but can also be @samp{<} for adopted articles (@pxref{Customizing Threading}). @item ] Closing bracket, which is normally @samp{]}, but can also be @samp{>} for adopted articles. @item > One space for each thread level. @item < Twenty minus thread level spaces. @item U Unread. @xref{Read Articles}. @item R This misleadingly named specifier is the @dfn{secondary mark}. This mark will say whether the article has been replied to, has been cached, or has been saved. @xref{Other Marks}. @item i Score as a number (@pxref{Scoring}). @item z @vindex gnus-summary-zcore-fuzz Zcore, @samp{+} if above the default level and @samp{-} if below the default level. If the difference between @code{gnus-summary-default-score} and the score is less than @code{gnus-summary-zcore-fuzz}, this spec will not be used. @item V Total thread score. @item x @code{Xref}. @item D @code{Date}. @item d The @code{Date} in @code{DD-MMM} format. @item o The @code{Date} in @var{YYYYMMDD}@code{T}@var{HHMMSS} format. @item M @code{Message-ID}. @item r @code{References}. @item t Number of articles in the current sub-thread. Using this spec will slow down summary buffer generation somewhat. @item e An @samp{=} (@code{gnus-not-empty-thread-mark}) will be displayed if the article has any children. @item P The line number. @item O Download mark. @item * Desired cursor position (instead of after first colon). @item &user-date; Age sensitive date format. Various date format is defined in @code{gnus-user-date-format-alist}. @item u User defined specifier. The next character in the format string should be a letter. Gnus will call the function @code{gnus-user-format-function-@var{x}}, where @var{x} is the letter following @samp{%u}. The function will be passed the current header as argument. The function should return a string, which will be inserted into the summary just like information from any other summary specifier. @end table Text between @samp{%(} and @samp{%)} will be highlighted with @code{gnus-mouse-face} when the mouse point is placed inside the area. There can only be one such area. The @samp{%U} (status), @samp{%R} (replied) and @samp{%z} (zcore) specs have to be handled with care. For reasons of efficiency, Gnus will compute what column these characters will end up in, and hard-code'' that. This means that it is invalid to have these specs after a variable-length spec. Well, you might not be arrested, but your summary buffer will look strange, which is bad enough. The smart choice is to have these specs as far to the left as possible. (Isn't that the case with everything, though? But I digress.) This restriction may disappear in later versions of Gnus. @node To From Newsgroups @subsection To From Newsgroups @cindex To @cindex Newsgroups In some groups (particularly in archive groups), the @code{From} header isn't very interesting, since all the articles there are written by you. To display the information in the @code{To} or @code{Newsgroups} headers instead, you need to decide three things: What information to gather; where to display it; and when to display it. @enumerate @item @vindex gnus-extra-headers The reading of extra header information is controlled by the @code{gnus-extra-headers}. This is a list of header symbols. For instance: @lisp (setq gnus-extra-headers '(To Newsgroups X-Newsreader)) @end lisp This will result in Gnus trying to obtain these three headers, and storing it in header structures for later easy retrieval. @item @findex gnus-extra-header The value of these extra headers can be accessed via the @code{gnus-extra-header} function. Here's a format line spec that will access the @code{X-Newsreader} header: @example "%~(form (gnus-extra-header 'X-Newsreader))@@" @end example @item @vindex gnus-ignored-from-addresses The @code{gnus-ignored-from-addresses} variable says when the @samp{%f} summary line spec returns the @code{To}, @code{Newsreader} or @code{From} header. If this regexp matches the contents of the @code{From} header, the value of the @code{To} or @code{Newsreader} headers are used instead. @end enumerate @vindex nnmail-extra-headers A related variable is @code{nnmail-extra-headers}, which controls when to include extra headers when generating overview (@acronym{NOV}) files. If you have old overview files, you should regenerate them after changing this variable, by entering the server buffer using @kbd{^}, and then @kbd{g} on the appropriate mail server (e.g. nnml) to cause regeneration. @vindex gnus-summary-line-format You also have to instruct Gnus to display the data by changing the @code{%n} spec to the @code{%f} spec in the @code{gnus-summary-line-format} variable. In summary, you'd typically put something like the following in @file{~/.gnus.el}: @lisp (setq gnus-extra-headers '(To Newsgroups)) (setq nnmail-extra-headers gnus-extra-headers) (setq gnus-summary-line-format "%U%R%z%I%(%[%4L: %-23,23f%]%) %s\n") (setq gnus-ignored-from-addresses "Your Name Here") @end lisp (The values listed above are the default values in Gnus. Alter them to fit your needs.) A note for news server administrators, or for users who wish to try to convince their news server administrator to provide some additional support: The above is mostly useful for mail groups, where you have control over the @acronym{NOV} files that are created. However, if you can persuade your nntp admin to add (in the usual implementation, notably INN): @example Newsgroups:full @end example to the end of her @file{overview.fmt} file, then you can use that just as you would the extra headers from the mail groups. @node Summary Buffer Mode Line @subsection Summary Buffer Mode Line @vindex gnus-summary-mode-line-format You can also change the format of the summary mode bar (@pxref{Mode Line Formatting}). Set @code{gnus-summary-mode-line-format} to whatever you like. The default is @samp{Gnus: %%b [%A] %Z}. Here are the elements you can play with: @table @samp @item G Group name. @item p Unprefixed group name. @item A Current article number. @item z Current article score. @item V Gnus version. @item U Number of unread articles in this group. @item e Number of unread articles in this group that aren't displayed in the summary buffer. @item Z A string with the number of unread and unselected articles represented either as @samp{<%U(+%e) more>} if there are both unread and unselected articles, and just as @samp{<%U more>} if there are just unread articles and no unselected ones. @item g Shortish group name. For instance, @samp{rec.arts.anime} will be shortened to @samp{r.a.anime}. @item S Subject of the current article. @item u User-defined spec (@pxref{User-Defined Specs}). @item s Name of the current score file (@pxref{Scoring}). @item d Number of dormant articles (@pxref{Unread Articles}). @item t Number of ticked articles (@pxref{Unread Articles}). @item r Number of articles that have been marked as read in this session. @item E Number of articles expunged by the score files. @end table @node Summary Highlighting @subsection Summary Highlighting @table @code @item gnus-visual-mark-article-hook @vindex gnus-visual-mark-article-hook This hook is run after selecting an article. It is meant to be used for highlighting the article in some way. It is not run if @code{gnus-visual} is @code{nil}. @item gnus-summary-update-hook @vindex gnus-summary-update-hook This hook is called when a summary line is changed. It is not run if @code{gnus-visual} is @code{nil}. @item gnus-summary-selected-face @vindex gnus-summary-selected-face This is the face (or @dfn{font} as some people call it) used to highlight the current article in the summary buffer. @item gnus-summary-highlight @vindex gnus-summary-highlight Summary lines are highlighted according to this variable, which is a list where the elements are of the format @code{(@var{form} . @var{face})}. If you would, for instance, like ticked articles to be italic and high-scored articles to be bold, you could set this variable to something like @lisp (((eq mark gnus-ticked-mark) . italic) ((> score default) . bold)) @end lisp As you may have guessed, if @var{form} returns a non-@code{nil} value, @var{face} will be applied to the line. @end table @node Summary Maneuvering @section Summary Maneuvering @cindex summary movement All the straight movement commands understand the numeric prefix and behave pretty much as you'd expect. None of these commands select articles. @table @kbd @item G M-n @itemx M-n @kindex M-n (Summary) @kindex G M-n (Summary) @findex gnus-summary-next-unread-subject Go to the next summary line of an unread article (@code{gnus-summary-next-unread-subject}). @item G M-p @itemx M-p @kindex M-p (Summary) @kindex G M-p (Summary) @findex gnus-summary-prev-unread-subject Go to the previous summary line of an unread article (@code{gnus-summary-prev-unread-subject}). @item G g @kindex G g (Summary) @findex gnus-summary-goto-subject Ask for an article number and then go to the summary line of that article without displaying the article (@code{gnus-summary-goto-subject}). @end table If Gnus asks you to press a key to confirm going to the next group, you can use the @kbd{C-n} and @kbd{C-p} keys to move around the group buffer, searching for the next group to read without actually returning to the group buffer. Variables related to summary movement: @table @code @vindex gnus-auto-select-next @item gnus-auto-select-next If you issue one of the movement commands (like @kbd{n}) and there are no more unread articles after the current one, Gnus will offer to go to the next group. If this variable is @code{t} and the next group is empty, Gnus will exit summary mode and return to the group buffer. If this variable is neither @code{t} nor @code{nil}, Gnus will select the next group with unread articles. As a special case, if this variable is @code{quietly}, Gnus will select the next group without asking for confirmation. If this variable is @code{almost-quietly}, the same will happen only if you are located on the last article in the group. Finally, if this variable is @code{slightly-quietly}, the @kbd{Z n} command will go to the next group without confirmation. Also @pxref{Group Levels}. @item gnus-auto-select-same @vindex gnus-auto-select-same If non-@code{nil}, all the movement commands will try to go to the next article with the same subject as the current. (@dfn{Same} here might mean @dfn{roughly equal}. See @code{gnus-summary-gather-subject-limit} for details (@pxref{Customizing Threading}).) If there are no more articles with the same subject, go to the first unread article. This variable is not particularly useful if you use a threaded display. @item gnus-summary-check-current @vindex gnus-summary-check-current If non-@code{nil}, all the unread'' movement commands will not proceed to the next (or previous) article if the current article is unread. Instead, they will choose the current article. @item gnus-auto-center-summary @vindex gnus-auto-center-summary If non-@code{nil}, Gnus will keep the point in the summary buffer centered at all times. This makes things quite tidy, but if you have a slow network connection, or simply do not like this un-Emacsism, you can set this variable to @code{nil} to get the normal Emacs scrolling action. This will also inhibit horizontal re-centering of the summary buffer, which might make it more inconvenient to read extremely long threads. This variable can also be a number. In that case, center the window at the given number of lines from the top. @end table @node Choosing Articles @section Choosing Articles @cindex selecting articles @menu * Choosing Commands:: Commands for choosing articles. * Choosing Variables:: Variables that influence these commands. @end menu @node Choosing Commands @subsection Choosing Commands None of the following movement commands understand the numeric prefix, and they all select and display an article. If you want to fetch new articles or redisplay the group, see @ref{Exiting the Summary Buffer}. @table @kbd @item SPACE @kindex SPACE (Summary) @findex gnus-summary-next-page Select the current article, or, if that one's read already, the next unread article (@code{gnus-summary-next-page}). If you have an article window open already and you press @kbd{SPACE} again, the article will be scrolled. This lets you conveniently @kbd{SPACE} through an entire newsgroup. @xref{Paging the Article}. @item G n @itemx n @kindex n (Summary) @kindex G n (Summary) @findex gnus-summary-next-unread-article @c @icon{gnus-summary-next-unread} Go to next unread article (@code{gnus-summary-next-unread-article}). @item G p @itemx p @kindex p (Summary) @findex gnus-summary-prev-unread-article @c @icon{gnus-summary-prev-unread} Go to previous unread article (@code{gnus-summary-prev-unread-article}). @item G N @itemx N @kindex N (Summary) @kindex G N (Summary) @findex gnus-summary-next-article Go to the next article (@code{gnus-summary-next-article}). @item G P @itemx P @kindex P (Summary) @kindex G P (Summary) @findex gnus-summary-prev-article Go to the previous article (@code{gnus-summary-prev-article}). @item G C-n @kindex G C-n (Summary) @findex gnus-summary-next-same-subject Go to the next article with the same subject (@code{gnus-summary-next-same-subject}). @item G C-p @kindex G C-p (Summary) @findex gnus-summary-prev-same-subject Go to the previous article with the same subject (@code{gnus-summary-prev-same-subject}). @item G f @itemx . @kindex G f (Summary) @kindex . (Summary) @findex gnus-summary-first-unread-article Go to the first unread article (@code{gnus-summary-first-unread-article}). @item G b @itemx , @kindex G b (Summary) @kindex , (Summary) @findex gnus-summary-best-unread-article Go to the unread article with the highest score (@code{gnus-summary-best-unread-article}). If given a prefix argument, go to the first unread article that has a score over the default score. @item G l @itemx l @kindex l (Summary) @kindex G l (Summary) @findex gnus-summary-goto-last-article Go to the previous article read (@code{gnus-summary-goto-last-article}). @item G o @kindex G o (Summary) @findex gnus-summary-pop-article @cindex history @cindex article history Pop an article off the summary history and go to this article (@code{gnus-summary-pop-article}). This command differs from the command above in that you can pop as many previous articles off the history as you like, while @kbd{l} toggles the two last read articles. For a somewhat related issue (if you use these commands a lot), @pxref{Article Backlog}. @item G j @itemx j @kindex j (Summary) @kindex G j (Summary) @findex gnus-summary-goto-article Ask for an article number or @code{Message-ID}, and then go to that article (@code{gnus-summary-goto-article}). @end table @node Choosing Variables @subsection Choosing Variables Some variables relevant for moving and selecting articles: @table @code @item gnus-auto-extend-newsgroup @vindex gnus-auto-extend-newsgroup All the movement commands will try to go to the previous (or next) article, even if that article isn't displayed in the Summary buffer if this variable is non-@code{nil}. Gnus will then fetch the article from the server and display it in the article buffer. @item gnus-select-article-hook @vindex gnus-select-article-hook This hook is called whenever an article is selected. The default is @code{nil}. If you would like each article to be saved in the Agent as you read it, putting @code{gnus-agent-fetch-selected-article} on this hook will do so. @item gnus-mark-article-hook @vindex gnus-mark-article-hook @findex gnus-summary-mark-unread-as-read @findex gnus-summary-mark-read-and-unread-as-read @findex gnus-unread-mark This hook is called whenever an article is selected. It is intended to be used for marking articles as read. The default value is @code{gnus-summary-mark-read-and-unread-as-read}, and will change the mark of almost any article you read to @code{gnus-read-mark}. The only articles not affected by this function are ticked, dormant, and expirable articles. If you'd instead like to just have unread articles marked as read, you can use @code{gnus-summary-mark-unread-as-read} instead. It will leave marks like @code{gnus-low-score-mark}, @code{gnus-del-mark} (and so on) alone. @end table @node Paging the Article @section Scrolling the Article @cindex article scrolling @table @kbd @item SPACE @kindex SPACE (Summary) @findex gnus-summary-next-page Pressing @kbd{SPACE} will scroll the current article forward one page, or, if you have come to the end of the current article, will choose the next article (@code{gnus-summary-next-page}). @vindex gnus-article-boring-faces @vindex gnus-article-skip-boring If @code{gnus-article-skip-boring} is non-@code{nil} and the rest of the article consists only of citations and signature, then it will be skipped; the next article will be shown instead. You can customize what is considered uninteresting with @code{gnus-article-boring-faces}. You can manually view the article's pages, no matter how boring, using @kbd{C-M-v}. @item DEL @kindex DEL (Summary) @findex gnus-summary-prev-page Scroll the current article back one page (@code{gnus-summary-prev-page}). @item RET @kindex RET (Summary) @findex gnus-summary-scroll-up Scroll the current article one line forward (@code{gnus-summary-scroll-up}). @item M-RET @kindex M-RET (Summary) @findex gnus-summary-scroll-down Scroll the current article one line backward (@code{gnus-summary-scroll-down}). @item A g @itemx g @kindex A g (Summary) @kindex g (Summary) @findex gnus-summary-show-article @vindex gnus-summary-show-article-charset-alist (Re)fetch the current article (@code{gnus-summary-show-article}). If given a prefix, fetch the current article, but don't run any of the article treatment functions. This will give you a raw'' article, just the way it came from the server. If given a numerical prefix, you can do semi-manual charset stuff. @kbd{C-u 0 g cn-gb-2312 RET} will decode the message as if it were encoded in the @code{cn-gb-2312} charset. If you have @lisp (setq gnus-summary-show-article-charset-alist '((1 . cn-gb-2312) (2 . big5))) @end lisp then you can say @kbd{C-u 1 g} to get the same effect. @item A < @itemx < @kindex < (Summary) @kindex A < (Summary) @findex gnus-summary-beginning-of-article Scroll to the beginning of the article (@code{gnus-summary-beginning-of-article}). @item A > @itemx > @kindex > (Summary) @kindex A > (Summary) @findex gnus-summary-end-of-article Scroll to the end of the article (@code{gnus-summary-end-of-article}). @item A s @itemx s @kindex A s (Summary) @kindex s (Summary) @findex gnus-summary-isearch-article Perform an isearch in the article buffer (@code{gnus-summary-isearch-article}). @item h @kindex h (Summary) @findex gnus-summary-select-article-buffer Select the article buffer (@code{gnus-summary-select-article-buffer}). @end table @node Reply Followup and Post @section Reply, Followup and Post @menu * Summary Mail Commands:: Sending mail. * Summary Post Commands:: Sending news. * Summary Message Commands:: Other Message-related commands. * Canceling and Superseding:: @end menu @node Summary Mail Commands @subsection Summary Mail Commands @cindex mail @cindex composing mail Commands for composing a mail message: @table @kbd @item S r @itemx r @kindex S r (Summary) @kindex r (Summary) @findex gnus-summary-reply @c @icon{gnus-summary-mail-reply} @c @icon{gnus-summary-reply} Mail a reply to the author of the current article (@code{gnus-summary-reply}). @item S R @itemx R @kindex R (Summary) @kindex S R (Summary) @findex gnus-summary-reply-with-original @c @icon{gnus-summary-reply-with-original} Mail a reply to the author of the current article and include the original message (@code{gnus-summary-reply-with-original}). This command uses the process/prefix convention. @item S w @kindex S w (Summary) @findex gnus-summary-wide-reply Mail a wide reply to the author of the current article (@code{gnus-summary-wide-reply}). A @dfn{wide reply} is a reply that goes out to all people listed in the @code{To}, @code{From} (or @code{Reply-to}) and @code{Cc} headers. If @code{Mail-Followup-To} is present, that's used instead. @item S W @kindex S W (Summary) @findex gnus-summary-wide-reply-with-original Mail a wide reply to the current article and include the original message (@code{gnus-summary-wide-reply-with-original}). This command uses the process/prefix convention. @item S v @kindex S v (Summary) @findex gnus-summary-very-wide-reply Mail a very wide reply to the author of the current article (@code{gnus-summary-wide-reply}). A @dfn{very wide reply} is a reply that goes out to all people listed in the @code{To}, @code{From} (or @code{Reply-to}) and @code{Cc} headers in all the process/prefixed articles. This command uses the process/prefix convention. @item S V @kindex S V (Summary) @findex gnus-summary-very-wide-reply-with-original Mail a very wide reply to the author of the current article and include the original message (@code{gnus-summary-very-wide-reply-with-original}). This command uses the process/prefix convention. @item S B r @kindex S B r (Summary) @findex gnus-summary-reply-broken-reply-to Mail a reply to the author of the current article but ignore the @code{Reply-To} field (@code{gnus-summary-reply-broken-reply-to}). If you need this because a mailing list incorrectly sets a @code{Reply-To} header pointing to the list, you probably want to set the @code{broken-reply-to} group parameter instead, so things will work correctly. @xref{Group Parameters}. @item S B R @kindex S B R (Summary) @findex gnus-summary-reply-broken-reply-to-with-original Mail a reply to the author of the current article and include the original message but ignore the @code{Reply-To} field (@code{gnus-summary-reply-broken-reply-to-with-original}). @item S o m @itemx C-c C-f @kindex S o m (Summary) @kindex C-c C-f (Summary) @findex gnus-summary-mail-forward @c @icon{gnus-summary-mail-forward} Forward the current article to some other person (@code{gnus-summary-mail-forward}). If no prefix is given, the message is forwarded according to the value of (@code{message-forward-as-mime}) and (@code{message-forward-show-mml}); if the prefix is 1, decode the message and forward directly inline; if the prefix is 2, forward message as an rfc822 @acronym{MIME} section; if the prefix is 3, decode message and forward as an rfc822 @acronym{MIME} section; if the prefix is 4, forward message directly inline; otherwise, the message is forwarded as no prefix given but use the flipped value of (@code{message-forward-as-mime}). By default, the message is decoded and forwarded as an rfc822 @acronym{MIME} section. @item S m @itemx m @kindex m (Summary) @kindex S m (Summary) @findex gnus-summary-mail-other-window @c @icon{gnus-summary-mail-originate} Prepare a mail (@code{gnus-summary-mail-other-window}). By default, use the posting style of the current group. If given a prefix, disable that. If the prefix is 1, prompt for a group name to find the posting style. @item S i @itemx i @kindex i (Summary) @kindex S i (Summary) @findex gnus-summary-news-other-window Prepare a news (@code{gnus-summary-news-other-window}). By default, post to the current group. If given a prefix, disable that. If the prefix is 1, prompt for a group to post to. This function actually prepares a news even when using mail groups. This is useful for posting'' messages to mail groups without actually sending them over the network: they're just saved directly to the group in question. The corresponding back end must have a request-post method for this to work though. @item S D b @kindex S D b (Summary) @findex gnus-summary-resend-bounced-mail @cindex bouncing mail If you have sent a mail, but the mail was bounced back to you for some reason (wrong address, transient failure), you can use this command to resend that bounced mail (@code{gnus-summary-resend-bounced-mail}). You will be popped into a mail buffer where you can edit the headers before sending the mail off again. If you give a prefix to this command, and the bounced mail is a reply to some other mail, Gnus will try to fetch that mail and display it for easy perusal of its headers. This might very well fail, though. @item S D r @kindex S D r (Summary) @findex gnus-summary-resend-message Not to be confused with the previous command, @code{gnus-summary-resend-message} will prompt you for an address to send the current message off to, and then send it to that place. The headers of the message won't be altered---but lots of headers that say @code{Resent-To}, @code{Resent-From} and so on will be added. This means that you actually send a mail to someone that has a @code{To} header that (probably) points to yourself. This will confuse people. So, natcherly you'll only do that if you're really eVIl. This command is mainly used if you have several accounts and want to ship a mail to a different account of yours. (If you're both @code{root} and @code{postmaster} and get a mail for @code{postmaster} to the @code{root} account, you may want to resend it to @code{postmaster}. Ordnung muss sein! This command understands the process/prefix convention (@pxref{Process/Prefix}). @item S D e @kindex S D e (Summary) @findex gnus-summary-resend-message-edit Like the previous command, but will allow you to edit the message as if it were a new message before resending. @item S O m @kindex S O m (Summary) @findex gnus-uu-digest-mail-forward Digest the current series (@pxref{Decoding Articles}) and forward the result using mail (@code{gnus-uu-digest-mail-forward}). This command uses the process/prefix convention (@pxref{Process/Prefix}). @item S M-c @kindex S M-c (Summary) @findex gnus-summary-mail-crosspost-complaint @cindex crossposting @cindex excessive crossposting Send a complaint about excessive crossposting to the author of the current article (@code{gnus-summary-mail-crosspost-complaint}). @findex gnus-crosspost-complaint This command is provided as a way to fight back against the current crossposting pandemic that's sweeping Usenet. It will compose a reply using the @code{gnus-crosspost-complaint} variable as a preamble. This command understands the process/prefix convention (@pxref{Process/Prefix}) and will prompt you before sending each mail. @end table Also @xref{Header Commands, ,Header Commands, message, The Message Manual}, for more information. @node Summary Post Commands @subsection Summary Post Commands @cindex post @cindex composing news Commands for posting a news article: @table @kbd @item S p @itemx a @kindex a (Summary) @kindex S p (Summary) @findex gnus-summary-post-news @c @icon{gnus-summary-post-news} Prepare for posting an article (@code{gnus-summary-post-news}). By default, post to the current group. If given a prefix, disable that. If the prefix is 1, prompt for another group instead. @item S f @itemx f @kindex f (Summary) @kindex S f (Summary) @findex gnus-summary-followup @c @icon{gnus-summary-followup} Post a followup to the current article (@code{gnus-summary-followup}). @item S F @itemx F @kindex S F (Summary) @kindex F (Summary) @c @icon{gnus-summary-followup-with-original} @findex gnus-summary-followup-with-original Post a followup to the current article and include the original message (@code{gnus-summary-followup-with-original}). This command uses the process/prefix convention. @item S n @kindex S n (Summary) @findex gnus-summary-followup-to-mail Post a followup to the current article via news, even if you got the message through mail (@code{gnus-summary-followup-to-mail}). @item S N @kindex S N (Summary) @findex gnus-summary-followup-to-mail-with-original Post a followup to the current article via news, even if you got the message through mail and include the original message (@code{gnus-summary-followup-to-mail-with-original}). This command uses the process/prefix convention. @item S o p @kindex S o p (Summary) @findex gnus-summary-post-forward Forward the current article to a newsgroup (@code{gnus-summary-post-forward}). If no prefix is given, the message is forwarded according to the value of (@code{message-forward-as-mime}) and (@code{message-forward-show-mml}); if the prefix is 1, decode the message and forward directly inline; if the prefix is 2, forward message as an rfc822 @acronym{MIME} section; if the prefix is 3, decode message and forward as an rfc822 @acronym{MIME} section; if the prefix is 4, forward message directly inline; otherwise, the message is forwarded as no prefix given but use the flipped value of (@code{message-forward-as-mime}). By default, the message is decoded and forwarded as an rfc822 @acronym{MIME} section. @item S O p @kindex S O p (Summary) @findex gnus-uu-digest-post-forward @cindex digests @cindex making digests Digest the current series and forward the result to a newsgroup (@code{gnus-uu-digest-post-forward}). This command uses the process/prefix convention. @item S u @kindex S u (Summary) @findex gnus-uu-post-news @c @icon{gnus-uu-post-news} Uuencode a file, split it into parts, and post it as a series (@code{gnus-uu-post-news}). (@pxref{Uuencoding and Posting}). @end table Also @xref{Header Commands, ,Header Commands, message, The Message Manual}, for more information. @node Summary Message Commands @subsection Summary Message Commands @table @kbd @item S y @kindex S y (Summary) @findex gnus-summary-yank-message Yank the current article into an already existing Message composition buffer (@code{gnus-summary-yank-message}). This command prompts for what message buffer you want to yank into, and understands the process/prefix convention (@pxref{Process/Prefix}). @end table @node Canceling and Superseding @subsection Canceling Articles @cindex canceling articles @cindex superseding articles Have you ever written something, and then decided that you really, really, really wish you hadn't posted that? Well, you can't cancel mail, but you can cancel posts. @findex gnus-summary-cancel-article @kindex C (Summary) @c @icon{gnus-summary-cancel-article} Find the article you wish to cancel (you can only cancel your own articles, so don't try any funny stuff). Then press @kbd{C} or @kbd{S c} (@code{gnus-summary-cancel-article}). Your article will be canceled---machines all over the world will be deleting your article. This command uses the process/prefix convention (@pxref{Process/Prefix}). Be aware, however, that not all sites honor cancels, so your article may live on here and there, while most sites will delete the article in question. Gnus will use the current'' select method when canceling. If you want to use the standard posting method, use the @samp{a} symbolic prefix (@pxref{Symbolic Prefixes}). Gnus ensures that only you can cancel your own messages using a @code{Cancel-Lock} header (@pxref{Canceling News, Canceling News, , message, Message Manual}). If you discover that you have made some mistakes and want to do some corrections, you can post a @dfn{superseding} article that will replace your original article. @findex gnus-summary-supersede-article @kindex S (Summary) Go to the original article and press @kbd{S s} (@code{gnus-summary-supersede-article}). You will be put in a buffer where you can edit the article all you want before sending it off the usual way. The same goes for superseding as for canceling, only more so: Some sites do not honor superseding. On those sites, it will appear that you have posted almost the same article twice. If you have just posted the article, and change your mind right away, there is a trick you can use to cancel/supersede the article without waiting for the article to appear on your site first. You simply return to the post buffer (which is called @code{*sent ...*}). There you will find the article you just posted, with all the headers intact. Change the @code{Message-ID} header to a @code{Cancel} or @code{Supersedes} header by substituting one of those words for the word @code{Message-ID}. Then just press @kbd{C-c C-c} to send the article as you would do normally. The previous article will be canceled/superseded. Just remember, kids: There is no 'c' in 'supersede'. @node Delayed Articles @section Delayed Articles @cindex delayed sending @cindex send delayed Sometimes, you might wish to delay the sending of a message. For example, you might wish to arrange for a message to turn up just in time to remind your about the birthday of your Significant Other. For this, there is the @code{gnus-delay} package. Setup is simple: @lisp (gnus-delay-initialize) @end lisp @findex gnus-delay-article Normally, to send a message you use the @kbd{C-c C-c} command from Message mode. To delay a message, use @kbd{C-c C-j} (@code{gnus-delay-article}) instead. This will ask you for how long the message should be delayed. Possible answers are: @itemize @bullet @item A time span. Consists of an integer and a letter. For example, @code{42d} means to delay for 42 days. Available letters are @code{m} (minutes), @code{h} (hours), @code{d} (days), @code{w} (weeks), @code{M} (months) and @code{Y} (years). @item A specific date. Looks like @code{YYYY-MM-DD}. The message will be delayed until that day, at a specific time (eight o'clock by default). See also @code{gnus-delay-default-hour}. @item A specific time of day. Given in @code{hh:mm} format, 24h, no am/pm stuff. The deadline will be at that time today, except if that time has already passed, then it's at the given time tomorrow. So if it's ten o'clock in the morning and you specify @code{11:15}, then the deadline is one hour and fifteen minutes hence. But if you specify @code{9:20}, that means a time tomorrow. @end itemize The action of the @code{gnus-delay-article} command is influenced by a couple of variables: @table @code @item gnus-delay-default-hour @vindex gnus-delay-default-hour When you specify a specific date, the message will be due on that hour on the given date. Possible values are integers 0 through 23. @item gnus-delay-default-delay @vindex gnus-delay-default-delay This is a string and gives the default delay. It can be of any of the formats described above. @item gnus-delay-group @vindex gnus-delay-group Delayed articles will be kept in this group on the drafts server until they are due. You probably don't need to change this. The default value is @code{"delayed"}. @item gnus-delay-header @vindex gnus-delay-header The deadline for each article will be stored in a header. This variable is a string and gives the header name. You probably don't need to change this. The default value is @code{"X-Gnus-Delayed"}. @end table The way delaying works is like this: when you use the @code{gnus-delay-article} command, you give a certain delay. Gnus calculates the deadline of the message and stores it in the @code{X-Gnus-Delayed} header and puts the message in the @code{nndraft:delayed} group. @findex gnus-delay-send-queue And whenever you get new news, Gnus looks through the group for articles which are due and sends them. It uses the @code{gnus-delay-send-queue} function for this. By default, this function is added to the hook @code{gnus-get-new-news-hook}. But of course, you can change this. Maybe you want to use the demon to send drafts? Just tell the demon to execute the @code{gnus-delay-send-queue} function. @table @code @item gnus-delay-initialize @findex gnus-delay-initialize By default, this function installs @code{gnus-delay-send-queue} in @code{gnus-get-new-news-hook}. But it accepts the optional second argument @code{no-check}. If it is non-@code{nil}, @code{gnus-get-new-news-hook} is not changed. The optional first argument is ignored. For example, @code{(gnus-delay-initialize nil t)} means to do nothing. Presumably, you want to use the demon for sending due delayed articles. Just don't forget to set that up :-) @end table @node Marking Articles @section Marking Articles @cindex article marking @cindex article ticking @cindex marks There are several marks you can set on an article. You have marks that decide the @dfn{readedness} (whoo, neato-keano neologism ohoy!) of the article. Alphabetic marks generally mean @dfn{read}, while non-alphabetic characters generally mean @dfn{unread}. In addition, you also have marks that do not affect readedness. @ifinfo There's a plethora of commands for manipulating these marks. @end ifinfo @menu * Unread Articles:: Marks for unread articles. * Read Articles:: Marks for read articles. * Other Marks:: Marks that do not affect readedness. * Setting Marks:: How to set and remove marks. * Generic Marking Commands:: How to customize the marking. * Setting Process Marks:: How to mark articles for later processing. @end menu @node Unread Articles @subsection Unread Articles The following marks mark articles as (kinda) unread, in one form or other. @table @samp @item ! @vindex gnus-ticked-mark Marked as ticked (@code{gnus-ticked-mark}). @dfn{Ticked articles} are articles that will remain visible always. If you see an article that you find interesting, or you want to put off reading it, or replying to it, until sometime later, you'd typically tick it. However, articles can be expired (from news servers by the news server software, Gnus itself never expires ticked messages), so if you want to keep an article forever, you'll have to make it persistent (@pxref{Persistent Articles}). @item ? @vindex gnus-dormant-mark Marked as dormant (@code{gnus-dormant-mark}). @dfn{Dormant articles} will only appear in the summary buffer if there are followups to it. If you want to see them even if they don't have followups, you can use the @kbd{/ D} command (@pxref{Limiting}). Otherwise (except for the visibility issue), they are just like ticked messages. @item SPACE @vindex gnus-unread-mark Marked as unread (@code{gnus-unread-mark}). @dfn{Unread articles} are articles that haven't been read at all yet. @end table @node Read Articles @subsection Read Articles @cindex expirable mark All the following marks mark articles as read. @table @samp @item r @vindex gnus-del-mark These are articles that the user has marked as read with the @kbd{d} command manually, more or less (@code{gnus-del-mark}). @item R @vindex gnus-read-mark Articles that have actually been read (@code{gnus-read-mark}). @item O @vindex gnus-ancient-mark Articles that were marked as read in previous sessions and are now @dfn{old} (@code{gnus-ancient-mark}). @item K @vindex gnus-killed-mark Marked as killed (@code{gnus-killed-mark}). @item X @vindex gnus-kill-file-mark Marked as killed by kill files (@code{gnus-kill-file-mark}). @item Y @vindex gnus-low-score-mark Marked as read by having too low a score (@code{gnus-low-score-mark}). @item C @vindex gnus-catchup-mark Marked as read by a catchup (@code{gnus-catchup-mark}). @item G @vindex gnus-canceled-mark Canceled article (@code{gnus-canceled-mark}) @item F @vindex gnus-souped-mark @sc{soup}ed article (@code{gnus-souped-mark}). @xref{SOUP}. @item Q @vindex gnus-sparse-mark Sparsely reffed article (@code{gnus-sparse-mark}). @xref{Customizing Threading}. @item M @vindex gnus-duplicate-mark Article marked as read by duplicate suppression (@code{gnus-duplicate-mark}). @xref{Duplicate Suppression}. @end table All these marks just mean that the article is marked as read, really. They are interpreted differently when doing adaptive scoring, though. One more special mark, though: @table @samp @item E @vindex gnus-expirable-mark Marked as expirable (@code{gnus-expirable-mark}). Marking articles as @dfn{expirable} (or have them marked as such automatically) doesn't make much sense in normal groups---a user doesn't control expiring of news articles, but in mail groups, for instance, articles marked as @dfn{expirable} can be deleted by Gnus at any time. @end table @node Other Marks @subsection Other Marks @cindex process mark @cindex bookmarks There are some marks that have nothing to do with whether the article is read or not. @itemize @bullet @item You can set a bookmark in the current article. Say you are reading a long thesis on cats' urinary tracts, and have to go home for dinner before you've finished reading the thesis. You can then set a bookmark in the article, and Gnus will jump to this bookmark the next time it encounters the article. @xref{Setting Marks}. @item @vindex gnus-replied-mark All articles that you have replied to or made a followup to (i.e., have answered) will be marked with an @samp{A} in the second column (@code{gnus-replied-mark}). @item @vindex gnus-forwarded-mark All articles that you have forwarded will be marked with an @samp{F} in the second column (@code{gnus-forwarded-mark}). @item @vindex gnus-cached-mark Articles stored in the article cache will be marked with an @samp{*} in the second column (@code{gnus-cached-mark}). @xref{Article Caching}. @item @vindex gnus-saved-mark Articles saved'' (in some manner or other; not necessarily religiously) are marked with an @samp{S} in the second column (@code{gnus-saved-mark}). @item @vindex gnus-recent-mark Articles that according to the server haven't been shown to the user before are marked with a @samp{N} in the second column (@code{gnus-recent-mark}). Note that not all servers support this mark, in which case it simply never appears. Compare with @code{gnus-unseen-mark}. @item @vindex gnus-unseen-mark Articles that haven't been seen before in Gnus by the user are marked with a @samp{.} in the second column (@code{gnus-unseen-mark}). Compare with @code{gnus-recent-mark}. @item @vindex gnus-downloaded-mark When using the Gnus agent (@pxref{Agent Basics}), articles may be downloaded for unplugged (offline) viewing. If you are using the @samp{%O} spec, these articles get the @samp{+} mark in that spec. (The variable @code{gnus-downloaded-mark} controls which character to use.) @item @vindex gnus-undownloaded-mark When using the Gnus agent (@pxref{Agent Basics}), some articles might not have been downloaded. Such articles cannot be viewed while you are unplugged (offline). If you are using the @samp{%O} spec, these articles get the @samp{-} mark in that spec. (The variable @code{gnus-undownloaded-mark} controls which character to use.) @item @vindex gnus-downloadable-mark The Gnus agent (@pxref{Agent Basics}) downloads some articles automatically, but it is also possible to explicitly mark articles for download, even if they would not be downloaded automatically. Such explicitly-marked articles get the @samp{%} mark in the first column. (The variable @code{gnus-downloadable-mark} controls which character to use.) @item @vindex gnus-not-empty-thread-mark @vindex gnus-empty-thread-mark If the @samp{%e} spec is used, the presence of threads or not will be marked with @code{gnus-not-empty-thread-mark} and @code{gnus-empty-thread-mark} in the third column, respectively. @item @vindex gnus-process-mark Finally we have the @dfn{process mark} (@code{gnus-process-mark}). A variety of commands react to the presence of the process mark. For instance, @kbd{X u} (@code{gnus-uu-decode-uu}) will uudecode and view all articles that have been marked with the process mark. Articles marked with the process mark have a @samp{#} in the second column. @end itemize You might have noticed that most of these non-readedness'' marks appear in the second column by default. So if you have a cached, saved, replied article that you have process-marked, what will that look like? Nothing much. The precedence rules go as follows: process -> cache -> replied -> saved. So if the article is in the cache and is replied, you'll only see the cache mark and not the replied mark. @node Setting Marks @subsection Setting Marks @cindex setting marks All the marking commands understand the numeric prefix. @table @kbd @item M c @itemx M-u @kindex M c (Summary) @kindex M-u (Summary) @findex gnus-summary-clear-mark-forward @cindex mark as unread Clear all readedness-marks from the current article (@code{gnus-summary-clear-mark-forward}). In other words, mark the article as unread. @item M t @itemx ! @kindex ! (Summary) @kindex M t (Summary) @findex gnus-summary-tick-article-forward Tick the current article (@code{gnus-summary-tick-article-forward}). @xref{Article Caching}. @item M ? @itemx ? @kindex ? (Summary) @kindex M ? (Summary) @findex gnus-summary-mark-as-dormant Mark the current article as dormant (@code{gnus-summary-mark-as-dormant}). @xref{Article Caching}. @item M d @itemx d @kindex M d (Summary) @kindex d (Summary) @findex gnus-summary-mark-as-read-forward Mark the current article as read (@code{gnus-summary-mark-as-read-forward}). @item D @kindex D (Summary) @findex gnus-summary-mark-as-read-backward Mark the current article as read and move point to the previous line (@code{gnus-summary-mark-as-read-backward}). @item M k @itemx k @kindex k (Summary) @kindex M k (Summary) @findex gnus-summary-kill-same-subject-and-select Mark all articles that have the same subject as the current one as read, and then select the next unread article (@code{gnus-summary-kill-same-subject-and-select}). @item M K @itemx C-k @kindex M K (Summary) @kindex C-k (Summary) @findex gnus-summary-kill-same-subject Mark all articles that have the same subject as the current one as read (@code{gnus-summary-kill-same-subject}). @item M C @kindex M C (Summary) @findex gnus-summary-catchup @c @icon{gnus-summary-catchup} Mark all unread articles as read (@code{gnus-summary-catchup}). @item M C-c @kindex M C-c (Summary) @findex gnus-summary-catchup-all Mark all articles in the group as read---even the ticked and dormant articles (@code{gnus-summary-catchup-all}). @item M H @kindex M H (Summary) @findex gnus-summary-catchup-to-here Catchup the current group to point (before the point) (@code{gnus-summary-catchup-to-here}). @item M h @kindex M h (Summary) @findex gnus-summary-catchup-from-here Catchup the current group from point (after the point) (@code{gnus-summary-catchup-from-here}). @item C-w @kindex C-w (Summary) @findex gnus-summary-mark-region-as-read Mark all articles between point and mark as read (@code{gnus-summary-mark-region-as-read}). @item M V k @kindex M V k (Summary) @findex gnus-summary-kill-below Kill all articles with scores below the default score (or below the numeric prefix) (@code{gnus-summary-kill-below}). @item M e @itemx E @kindex M e (Summary) @kindex E (Summary) @findex gnus-summary-mark-as-expirable Mark the current article as expirable (@code{gnus-summary-mark-as-expirable}). @item M b @kindex M b (Summary) @findex gnus-summary-set-bookmark Set a bookmark in the current article (@code{gnus-summary-set-bookmark}). @item M B @kindex M B (Summary) @findex gnus-summary-remove-bookmark Remove the bookmark from the current article (@code{gnus-summary-remove-bookmark}). @item M V c @kindex M V c (Summary) @findex gnus-summary-clear-above Clear all marks from articles with scores over the default score (or over the numeric prefix) (@code{gnus-summary-clear-above}). @item M V u @kindex M V u (Summary) @findex gnus-summary-tick-above Tick all articles with scores over the default score (or over the numeric prefix) (@code{gnus-summary-tick-above}). @item M V m @kindex M V m (Summary) @findex gnus-summary-mark-above Prompt for a mark, and mark all articles with scores over the default score (or over the numeric prefix) with this mark (@code{gnus-summary-clear-above}). @end table @vindex gnus-summary-goto-unread The @code{gnus-summary-goto-unread} variable controls what action should be taken after setting a mark. If non-@code{nil}, point will move to the next/previous unread article. If @code{nil}, point will just move one line up or down. As a special case, if this variable is @code{never}, all the marking commands as well as other commands (like @kbd{SPACE}) will move to the next article, whether it is unread or not. The default is @code{t}. @node Generic Marking Commands @subsection Generic Marking Commands Some people would like the command that ticks an article (@kbd{!}) go to the next article. Others would like it to go to the next unread article. Yet others would like it to stay on the current article. And even though I haven't heard of anybody wanting it to go to the previous (unread) article, I'm sure there are people that want that as well. Multiply these five behaviors with five different marking commands, and you get a potentially complex set of variable to control what each command should do. To sidestep that mess, Gnus provides commands that do all these different things. They can be found on the @kbd{M M} map in the summary buffer. Type @kbd{M M C-h} to see them all---there are too many of them to list in this manual. While you can use these commands directly, most users would prefer altering the summary mode keymap. For instance, if you would like the @kbd{!} command to go to the next article instead of the next unread article, you could say something like: @lisp @group (add-hook 'gnus-summary-mode-hook 'my-alter-summary-map) (defun my-alter-summary-map () (local-set-key "!" 'gnus-summary-put-mark-as-ticked-next)) @end group @end lisp @noindent or @lisp (defun my-alter-summary-map () (local-set-key "!" "MM!n")) @end lisp @node Setting Process Marks @subsection Setting Process Marks @cindex setting process marks Process marks are displayed as @code{#} in the summary buffer, and are used for marking articles in such a way that other commands will process these articles. For instance, if you process mark four articles and then use the @kbd{*} command, Gnus will enter these four articles into the cache. For more information, @pxref{Process/Prefix}. @table @kbd @item M P p @itemx # @kindex # (Summary) @kindex M P p (Summary) @findex gnus-summary-mark-as-processable Mark the current article with the process mark (@code{gnus-summary-mark-as-processable}). @findex gnus-summary-unmark-as-processable @item M P u @itemx M-# @kindex M P u (Summary) @kindex M-# (Summary) Remove the process mark, if any, from the current article (@code{gnus-summary-unmark-as-processable}). @item M P U @kindex M P U (Summary) @findex gnus-summary-unmark-all-processable Remove the process mark from all articles (@code{gnus-summary-unmark-all-processable}). @item M P i @kindex M P i (Summary) @findex gnus-uu-invert-processable Invert the list of process marked articles (@code{gnus-uu-invert-processable}). @item M P R @kindex M P R (Summary) @findex gnus-uu-mark-by-regexp Mark articles that have a @code{Subject} header that matches a regular expression (@code{gnus-uu-mark-by-regexp}). @item M P G @kindex M P G (Summary) @findex gnus-uu-unmark-by-regexp Unmark articles that have a @code{Subject} header that matches a regular expression (@code{gnus-uu-unmark-by-regexp}). @item M P r @kindex M P r (Summary) @findex gnus-uu-mark-region Mark articles in region (@code{gnus-uu-mark-region}). @item M P g @kindex M P g (Summary) @findex gnus-uu-unmark-region Unmark articles in region (@code{gnus-uu-unmark-region}). @item M P t @kindex M P t (Summary) @findex gnus-uu-mark-thread Mark all articles in the current (sub)thread (@code{gnus-uu-mark-thread}). @item M P T @kindex M P T (Summary) @findex gnus-uu-unmark-thread Unmark all articles in the current (sub)thread (@code{gnus-uu-unmark-thread}). @item M P v @kindex M P v (Summary) @findex gnus-uu-mark-over Mark all articles that have a score above the prefix argument (@code{gnus-uu-mark-over}). @item M P s @kindex M P s (Summary) @findex gnus-uu-mark-series Mark all articles in the current series (@code{gnus-uu-mark-series}). @item M P S @kindex M P S (Summary) @findex gnus-uu-mark-sparse Mark all series that have already had some articles marked (@code{gnus-uu-mark-sparse}). @item M P a @kindex M P a (Summary) @findex gnus-uu-mark-all Mark all articles in series order (@code{gnus-uu-mark-all}). @item M P b @kindex M P b (Summary) @findex gnus-uu-mark-buffer Mark all articles in the buffer in the order they appear (@code{gnus-uu-mark-buffer}). @item M P k @kindex M P k (Summary) @findex gnus-summary-kill-process-mark Push the current process mark set onto the stack and unmark all articles (@code{gnus-summary-kill-process-mark}). @item M P y @kindex M P y (Summary) @findex gnus-summary-yank-process-mark Pop the previous process mark set from the stack and restore it (@code{gnus-summary-yank-process-mark}). @item M P w @kindex M P w (Summary) @findex gnus-summary-save-process-mark Push the current process mark set onto the stack (@code{gnus-summary-save-process-mark}). @end table Also see the @kbd{&} command in @ref{Searching for Articles}, for how to set process marks based on article body contents. @node Limiting @section Limiting @cindex limiting It can be convenient to limit the summary buffer to just show some subset of the articles currently in the group. The effect most limit commands have is to remove a few (or many) articles from the summary buffer. All limiting commands work on subsets of the articles already fetched from the servers. None of these commands query the server for additional articles. @table @kbd @item / / @itemx / s @kindex / / (Summary) @findex gnus-summary-limit-to-subject Limit the summary buffer to articles that match some subject (@code{gnus-summary-limit-to-subject}). If given a prefix, exclude matching articles. @item / a @kindex / a (Summary) @findex gnus-summary-limit-to-author Limit the summary buffer to articles that match some author (@code{gnus-summary-limit-to-author}). If given a prefix, exclude matching articles. @item / x @kindex / x (Summary) @findex gnus-summary-limit-to-extra Limit the summary buffer to articles that match one of the extra'' headers (@pxref{To From Newsgroups}) (@code{gnus-summary-limit-to-extra}). If given a prefix, exclude matching articles. @item / u @itemx x @kindex / u (Summary) @kindex x (Summary) @findex gnus-summary-limit-to-unread Limit the summary buffer to articles not marked as read (@code{gnus-summary-limit-to-unread}). If given a prefix, limit the buffer to articles strictly unread. This means that ticked and dormant articles will also be excluded. @item / m @kindex / m (Summary) @findex gnus-summary-limit-to-marks Ask for a mark and then limit to all articles that have been marked with that mark (@code{gnus-summary-limit-to-marks}). @item / t @kindex / t (Summary) @findex gnus-summary-limit-to-age Ask for a number and then limit the summary buffer to articles older than (or equal to) that number of days (@code{gnus-summary-limit-to-age}). If given a prefix, limit to articles younger than that number of days. @item / n @kindex / n (Summary) @findex gnus-summary-limit-to-articles With prefix @samp{n}, limit the summary buffer to the next @samp{n} articles. If not given a prefix, use the process marked articles instead. (@code{gnus-summary-limit-to-articles}). @item / w @kindex / w (Summary) @findex gnus-summary-pop-limit Pop the previous limit off the stack and restore it (@code{gnus-summary-pop-limit}). If given a prefix, pop all limits off the stack. @item / . @kindex / . (Summary) @findex gnus-summary-limit-to-unseen Limit the summary buffer to the unseen articles (@code{gnus-summary-limit-to-unseen}). @item / v @kindex / v (Summary) @findex gnus-summary-limit-to-score Limit the summary buffer to articles that have a score at or above some score (@code{gnus-summary-limit-to-score}). @item / p @kindex / p (Summary) @findex gnus-summary-limit-to-display-predicate Limit the summary buffer to articles that satisfy the @code{display} group parameter predicate (@code{gnus-summary-limit-to-display-predicate}). @xref{Group Parameters}, for more on this predicate. @item / E @itemx M S @kindex M S (Summary) @kindex / E (Summary) @findex gnus-summary-limit-include-expunged Include all expunged articles in the limit (@code{gnus-summary-limit-include-expunged}). @item / D @kindex / D (Summary) @findex gnus-summary-limit-include-dormant Include all dormant articles in the limit (@code{gnus-summary-limit-include-dormant}). @item / * @kindex / * (Summary) @findex gnus-summary-limit-include-cached Include all cached articles in the limit (@code{gnus-summary-limit-include-cached}). @item / d @kindex / d (Summary) @findex gnus-summary-limit-exclude-dormant Exclude all dormant articles from the limit (@code{gnus-summary-limit-exclude-dormant}). @item / M @kindex / M (Summary) @findex gnus-summary-limit-exclude-marks Exclude all marked articles (@code{gnus-summary-limit-exclude-marks}). @item / T @kindex / T (Summary) @findex gnus-summary-limit-include-thread Include all the articles in the current thread in the limit. @item / c @kindex / c (Summary) @findex gnus-summary-limit-exclude-childless-dormant Exclude all dormant articles that have no children from the limit@* (@code{gnus-summary-limit-exclude-childless-dormant}). @item / C @kindex / C (Summary) @findex gnus-summary-limit-mark-excluded-as-read Mark all excluded unread articles as read (@code{gnus-summary-limit-mark-excluded-as-read}). If given a prefix, also mark excluded ticked and dormant articles as read. @item / N @kindex / N (Summary) @findex gnus-summary-insert-new-articles Insert all new articles in the summary buffer. It scans for new emails if @var{back-end}@code{-get-new-mail} is non-@code{nil}. @item / o @kindex / o (Summary) @findex gnus-summary-insert-old-articles Insert all old articles in the summary buffer. If given a numbered prefix, fetch this number of articles. @end table @node Threading @section Threading @cindex threading @cindex article threading Gnus threads articles by default. @dfn{To thread} is to put responses to articles directly after the articles they respond to---in a hierarchical fashion. Threading is done by looking at the @code{References} headers of the articles. In a perfect world, this would be enough to build pretty trees, but unfortunately, the @code{References} header is often broken or simply missing. Weird news propagation exacerbates the problem, so one has to employ other heuristics to get pleasing results. A plethora of approaches exists, as detailed in horrible detail in @ref{Customizing Threading}. First, a quick overview of the concepts: @table @dfn @item root The top-most article in a thread; the first article in the thread. @item thread A tree-like article structure. @item sub-thread A small(er) section of this tree-like structure. @item loose threads Threads often lose their roots due to article expiry, or due to the root already having been read in a previous session, and not displayed in the summary buffer. We then typically have many sub-threads that really belong to one thread, but are without connecting roots. These are called loose threads. @item thread gathering An attempt to gather loose threads into bigger threads. @item sparse threads A thread where the missing articles have been guessed'' at, and are displayed as empty lines in the summary buffer. @end table @menu * Customizing Threading:: Variables you can change to affect the threading. * Thread Commands:: Thread based commands in the summary buffer. @end menu @node Customizing Threading @subsection Customizing Threading @cindex customizing threading @menu * Loose Threads:: How Gnus gathers loose threads into bigger threads. * Filling In Threads:: Making the threads displayed look fuller. * More Threading:: Even more variables for fiddling with threads. * Low-Level Threading:: You thought it was over@dots{} but you were wrong! @end menu @node Loose Threads @subsubsection Loose Threads @cindex < @cindex > @cindex loose threads @table @code @item gnus-summary-make-false-root @vindex gnus-summary-make-false-root If non-@code{nil}, Gnus will gather all loose subtrees into one big tree and create a dummy root at the top. (Wait a minute. Root at the top? Yup.) Loose subtrees occur when the real root has expired, or you've read or killed the root in a previous session. When there is no real root of a thread, Gnus will have to fudge something. This variable says what fudging method Gnus should use. There are four possible values: @iftex @iflatex \gnusfigure{The Summary Buffer}{390}{ \put(0,0){\epsfig{figure=ps/summary-adopt,width=7.5cm}} \put(445,0){\makebox(0,0)[br]{\epsfig{figure=ps/summary-empty,width=7.5cm}}} \put(0,400){\makebox(0,0)[tl]{\epsfig{figure=ps/summary-none,width=7.5cm}}} \put(445,400){\makebox(0,0)[tr]{\epsfig{figure=ps/summary-dummy,width=7.5cm}}} } @end iflatex @end iftex @cindex adopting articles @table @code @item adopt Gnus will make the first of the orphaned articles the parent. This parent will adopt all the other articles. The adopted articles will be marked as such by pointy brackets (@samp{<>}) instead of the standard square brackets (@samp{[]}). This is the default method. @item dummy @vindex gnus-summary-dummy-line-format @vindex gnus-summary-make-false-root-always Gnus will create a dummy summary line that will pretend to be the parent. This dummy line does not correspond to any real article, so selecting it will just select the first real article after the dummy article. @code{gnus-summary-dummy-line-format} is used to specify the format of the dummy roots. It accepts only one format spec: @samp{S}, which is the subject of the article. @xref{Formatting Variables}. If you want all threads to have a dummy root, even the non-gathered ones, set @code{gnus-summary-make-false-root-always} to @code{t}. @item empty Gnus won't actually make any article the parent, but simply leave the subject field of all orphans except the first empty. (Actually, it will use @code{gnus-summary-same-subject} as the subject (@pxref{Summary Buffer Format}).) @item none Don't make any article parent at all. Just gather the threads and display them after one another. @item nil Don't gather loose threads. @end table @item gnus-summary-gather-subject-limit @vindex gnus-summary-gather-subject-limit Loose threads are gathered by comparing subjects of articles. If this variable is @code{nil}, Gnus requires an exact match between the subjects of the loose threads before gathering them into one big super-thread. This might be too strict a requirement, what with the presence of stupid newsreaders that chop off long subject lines. If you think so, set this variable to, say, 20 to require that only the first 20 characters of the subjects have to match. If you set this variable to a really low number, you'll find that Gnus will gather everything in sight into one thread, which isn't very helpful. @cindex fuzzy article gathering If you set this variable to the special value @code{fuzzy}, Gnus will use a fuzzy string comparison algorithm on the subjects (@pxref{Fuzzy Matching}). @item gnus-simplify-subject-fuzzy-regexp @vindex gnus-simplify-subject-fuzzy-regexp This can either be a regular expression or list of regular expressions that match strings that will be removed from subjects if fuzzy subject simplification is used. @item gnus-simplify-ignored-prefixes @vindex gnus-simplify-ignored-prefixes If you set @code{gnus-summary-gather-subject-limit} to something as low as 10, you might consider setting this variable to something sensible: @c Written by Michael Ernst <mernst@cs.rice.edu> @lisp (setq gnus-simplify-ignored-prefixes (concat "\\\$?\$$" (mapconcat 'identity '("looking" "wanted" "followup" "summary\\( of\$$?" "help" "query" "problem" "question" "answer" "reference" "announce" "How can I" "How to" "Comparison of" ;; ... ) "\\|") "\\)\\s *\$$" (mapconcat 'identity '("for" "for reference" "with" "about") "\\|") "\$$?\$?:?[ \t]*")) @end lisp All words that match this regexp will be removed before comparing two subjects. @item gnus-simplify-subject-functions @vindex gnus-simplify-subject-functions If non-@code{nil}, this variable overrides @code{gnus-summary-gather-subject-limit}. This variable should be a list of functions to apply to the @code{Subject} string iteratively to arrive at the simplified version of the string. Useful functions to put in this list include: @table @code @item gnus-simplify-subject-re @findex gnus-simplify-subject-re Strip the leading @samp{Re:}. @item gnus-simplify-subject-fuzzy @findex gnus-simplify-subject-fuzzy Simplify fuzzily. @item gnus-simplify-whitespace @findex gnus-simplify-whitespace Remove excessive whitespace. @item gnus-simplify-all-whitespace @findex gnus-simplify-all-whitespace Remove all whitespace. @end table You may also write your own functions, of course. @item gnus-summary-gather-exclude-subject @vindex gnus-summary-gather-exclude-subject Since loose thread gathering is done on subjects only, that might lead to many false hits, especially with certain common subjects like @samp{} and @samp{(none)}. To make the situation slightly better, you can use the regexp @code{gnus-summary-gather-exclude-subject} to say what subjects should be excluded from the gathering process.@* The default is @samp{^ *$\\|^(none)$}. @item gnus-summary-thread-gathering-function @vindex gnus-summary-thread-gathering-function Gnus gathers threads by looking at @code{Subject} headers. This means that totally unrelated articles may end up in the same thread'', which is confusing. An alternate approach is to look at all the @code{Message-ID}s in all the @code{References} headers to find matches. This will ensure that no gathered threads ever include unrelated articles, but it also means that people who have posted with broken newsreaders won't be gathered properly. The choice is yours---plague or cholera: @table @code @item gnus-gather-threads-by-subject @findex gnus-gather-threads-by-subject This function is the default gathering function and looks at @code{Subject}s exclusively. @item gnus-gather-threads-by-references @findex gnus-gather-threads-by-references This function looks at @code{References} headers exclusively. @end table If you want to test gathering by @code{References}, you could say something like: @lisp (setq gnus-summary-thread-gathering-function 'gnus-gather-threads-by-references) @end lisp @end table @node Filling In Threads @subsubsection Filling In Threads @table @code @item gnus-fetch-old-headers @vindex gnus-fetch-old-headers If non-@code{nil}, Gnus will attempt to build old threads by fetching more old headers---headers to articles marked as read. If you would like to display as few summary lines as possible, but still connect as many loose threads as possible, you should set this variable to @code{some} or a number. If you set it to a number, no more than that number of extra old headers will be fetched. In either case, fetching old headers only works if the back end you are using carries overview files---this would normally be @code{nntp}, @code{nnspool}, @code{nnml}, and @code{nnmaildir}. Also remember that if the root of the thread has been expired by the server, there's not much Gnus can do about that. This variable can also be set to @code{invisible}. This won't have any visible effects, but is useful if you use the @kbd{A T} command a lot (@pxref{Finding the Parent}). @item gnus-fetch-old-ephemeral-headers @vindex gnus-fetch-old-ephemeral-headers Same as @code{gnus-fetch-old-headers}, but only used for ephemeral newsgroups. @item gnus-build-sparse-threads @vindex gnus-build-sparse-threads Fetching old headers can be slow. A low-rent similar effect can be gotten by setting this variable to @code{some}. Gnus will then look at the complete @code{References} headers of all articles and try to string together articles that belong in the same thread. This will leave @dfn{gaps} in the threading display where Gnus guesses that an article is missing from the thread. (These gaps appear like normal summary lines. If you select a gap, Gnus will try to fetch the article in question.) If this variable is @code{t}, Gnus will display all these gaps'' without regard for whether they are useful for completing the thread or not. Finally, if this variable is @code{more}, Gnus won't cut off sparse leaf nodes that don't lead anywhere. This variable is @code{nil} by default. @item gnus-read-all-available-headers @vindex gnus-read-all-available-headers This is a rather obscure variable that few will find useful. It's intended for those non-news newsgroups where the back end has to fetch quite a lot to present the summary buffer, and where it's impossible to go back to parents of articles. This is mostly the case in the web-based groups, like the @code{nnultimate} groups. If you don't use those, then it's safe to leave this as the default @code{nil}. If you want to use this variable, it should be a regexp that matches the group name, or @code{t} for all groups. @end table @node More Threading @subsubsection More Threading @table @code @item gnus-show-threads @vindex gnus-show-threads If this variable is @code{nil}, no threading will be done, and all of the rest of the variables here will have no effect. Turning threading off will speed group selection up a bit, but it is sure to make reading slower and more awkward. @item gnus-thread-hide-subtree @vindex gnus-thread-hide-subtree If non-@code{nil}, all threads will be hidden when the summary buffer is generated. This can also be a predicate specifier (@pxref{Predicate Specifiers}). Available predicates are @code{gnus-article-unread-p} and @code{gnus-article-unseen-p}. Here's an example: @lisp (setq gnus-thread-hide-subtree '(or gnus-article-unread-p gnus-article-unseen-p)) @end lisp (It's a pretty nonsensical example, since all unseen articles are also unread, but you get my drift.) @item gnus-thread-expunge-below @vindex gnus-thread-expunge-below All threads that have a total score (as defined by @code{gnus-thread-score-function}) less than this number will be expunged. This variable is @code{nil} by default, which means that no threads are expunged. @item gnus-thread-hide-killed @vindex gnus-thread-hide-killed if you kill a thread and this variable is non-@code{nil}, the subtree will be hidden. @item gnus-thread-ignore-subject @vindex gnus-thread-ignore-subject Sometimes somebody changes the subject in the middle of a thread. If this variable is non-@code{nil}, which is the default, the subject change is ignored. If it is @code{nil}, a change in the subject will result in a new thread. @item gnus-thread-indent-level @vindex gnus-thread-indent-level This is a number that says how much each sub-thread should be indented. The default is 4. @item gnus-sort-gathered-threads-function @vindex gnus-sort-gathered-threads-function Sometimes, particularly with mailing lists, the order in which mails arrive locally is not necessarily the same as the order in which they arrived on the mailing list. Consequently, when sorting sub-threads using the default @code{gnus-thread-sort-by-number}, responses can end up appearing before the article to which they are responding to. Setting this variable to an alternate value (e.g. @code{gnus-thread-sort-by-date}), in a group's parameters or in an appropriate hook (e.g. @code{gnus-summary-generate-hook}) can produce a more logical sub-thread ordering in such instances. @end table @node Low-Level Threading @subsubsection Low-Level Threading @table @code @item gnus-parse-headers-hook @vindex gnus-parse-headers-hook Hook run before parsing any headers. @item gnus-alter-header-function @vindex gnus-alter-header-function If non-@code{nil}, this function will be called to allow alteration of article header structures. The function is called with one parameter, the article header vector, which it may alter in any way. For instance, if you have a mail-to-news gateway which alters the @code{Message-ID}s in systematic ways (by adding prefixes and such), you can use this variable to un-scramble the @code{Message-ID}s so that they are more meaningful. Here's one example: @lisp (setq gnus-alter-header-function 'my-alter-message-id) (defun my-alter-message-id (header) (let ((id (mail-header-id header))) (when (string-match "\$$<[^<>@@]*\$$\\.?cygnus\\..*@@\$$[^<>@@]*>\$$" id) (mail-header-set-id (concat (match-string 1 id) "@@" (match-string 2 id)) header)))) @end lisp @end table @node Thread Commands @subsection Thread Commands @cindex thread commands @table @kbd @item T k @itemx C-M-k @kindex T k (Summary) @kindex C-M-k (Summary) @findex gnus-summary-kill-thread Mark all articles in the current (sub-)thread as read (@code{gnus-summary-kill-thread}). If the prefix argument is positive, remove all marks instead. If the prefix argument is negative, tick articles instead. @item T l @itemx C-M-l @kindex T l (Summary) @kindex C-M-l (Summary) @findex gnus-summary-lower-thread Lower the score of the current (sub-)thread (@code{gnus-summary-lower-thread}). @item T i @kindex T i (Summary) @findex gnus-summary-raise-thread Increase the score of the current (sub-)thread (@code{gnus-summary-raise-thread}). @item T # @kindex T # (Summary) @findex gnus-uu-mark-thread Set the process mark on the current (sub-)thread (@code{gnus-uu-mark-thread}). @item T M-# @kindex T M-# (Summary) @findex gnus-uu-unmark-thread Remove the process mark from the current (sub-)thread (@code{gnus-uu-unmark-thread}). @item T T @kindex T T (Summary) @findex gnus-summary-toggle-threads Toggle threading (@code{gnus-summary-toggle-threads}). @item T s @kindex T s (Summary) @findex gnus-summary-show-thread Expose the (sub-)thread hidden under the current article, if any@* (@code{gnus-summary-show-thread}). @item T h @kindex T h (Summary) @findex gnus-summary-hide-thread Hide the current (sub-)thread (@code{gnus-summary-hide-thread}). @item T S @kindex T S (Summary) @findex gnus-summary-show-all-threads Expose all hidden threads (@code{gnus-summary-show-all-threads}). @item T H @kindex T H (Summary) @findex gnus-summary-hide-all-threads Hide all threads (@code{gnus-summary-hide-all-threads}). @item T t @kindex T t (Summary) @findex gnus-summary-rethread-current Re-thread the current article's thread (@code{gnus-summary-rethread-current}). This works even when the summary buffer is otherwise unthreaded. @item T ^ @kindex T ^ (Summary) @findex gnus-summary-reparent-thread Make the current article the child of the marked (or previous) article (@code{gnus-summary-reparent-thread}). @end table The following commands are thread movement commands. They all understand the numeric prefix. @table @kbd @item T n @kindex T n (Summary) @itemx C-M-f @kindex C-M-n (Summary) @itemx M-down @kindex M-down (Summary) @findex gnus-summary-next-thread Go to the next thread (@code{gnus-summary-next-thread}). @item T p @kindex T p (Summary) @itemx C-M-b @kindex C-M-p (Summary) @itemx M-up @kindex M-up (Summary) @findex gnus-summary-prev-thread Go to the previous thread (@code{gnus-summary-prev-thread}). @item T d @kindex T d (Summary) @findex gnus-summary-down-thread Descend the thread (@code{gnus-summary-down-thread}). @item T u @kindex T u (Summary) @findex gnus-summary-up-thread Ascend the thread (@code{gnus-summary-up-thread}). @item T o @kindex T o (Summary) @findex gnus-summary-top-thread Go to the top of the thread (@code{gnus-summary-top-thread}). @end table @vindex gnus-thread-operation-ignore-subject If you ignore subject while threading, you'll naturally end up with threads that have several different subjects in them. If you then issue a command like @kbd{T k} (@code{gnus-summary-kill-thread}) you might not wish to kill the entire thread, but just those parts of the thread that have the same subject as the current article. If you like this idea, you can fiddle with @code{gnus-thread-operation-ignore-subject}. If it is non-@code{nil} (which it is by default), subjects will be ignored when doing thread commands. If this variable is @code{nil}, articles in the same thread with different subjects will not be included in the operation in question. If this variable is @code{fuzzy}, only articles that have subjects fuzzily equal will be included (@pxref{Fuzzy Matching}). @node Sorting the Summary Buffer @section Sorting the Summary Buffer @findex gnus-thread-sort-by-total-score @findex gnus-thread-sort-by-date @findex gnus-thread-sort-by-score @findex gnus-thread-sort-by-subject @findex gnus-thread-sort-by-author @findex gnus-thread-sort-by-number @findex gnus-thread-sort-by-random @vindex gnus-thread-sort-functions @findex gnus-thread-sort-by-most-recent-number @findex gnus-thread-sort-by-most-recent-date If you are using a threaded summary display, you can sort the threads by setting @code{gnus-thread-sort-functions}, which can be either a single function, a list of functions, or a list containing functions and @code{(not some-function)} elements. By default, sorting is done on article numbers. Ready-made sorting predicate functions include @code{gnus-thread-sort-by-number}, @code{gnus-thread-sort-by-author}, @code{gnus-thread-sort-by-subject}, @code{gnus-thread-sort-by-date}, @code{gnus-thread-sort-by-score}, @code{gnus-thread-sort-by-most-recent-number}, @code{gnus-thread-sort-by-most-recent-date}, @code{gnus-thread-sort-by-random} and @code{gnus-thread-sort-by-total-score}. Each function takes two threads and returns non-@code{nil} if the first thread should be sorted before the other. Note that sorting really is normally done by looking only at the roots of each thread. If you use more than one function, the primary sort key should be the last function in the list. You should probably always include @code{gnus-thread-sort-by-number} in the list of sorting functions---preferably first. This will ensure that threads that are equal with respect to the other sort criteria will be displayed in ascending article order. If you would like to sort by reverse score, then by subject, and finally by number, you could do something like: @lisp (setq gnus-thread-sort-functions '(gnus-thread-sort-by-number gnus-thread-sort-by-subject (not gnus-thread-sort-by-total-score))) @end lisp The threads that have highest score will be displayed first in the summary buffer. When threads have the same score, they will be sorted alphabetically. The threads that have the same score and the same subject will be sorted by number, which is (normally) the sequence in which the articles arrived. If you want to sort by score and then reverse arrival order, you could say something like: @lisp (setq gnus-thread-sort-functions '((lambda (t1 t2) (not (gnus-thread-sort-by-number t1 t2))) gnus-thread-sort-by-score)) @end lisp @vindex gnus-thread-score-function The function in the @code{gnus-thread-score-function} variable (default @code{+}) is used for calculating the total score of a thread. Useful functions might be @code{max}, @code{min}, or squared means, or whatever tickles your fancy. @findex gnus-article-sort-functions @findex gnus-article-sort-by-date @findex gnus-article-sort-by-score @findex gnus-article-sort-by-subject @findex gnus-article-sort-by-author @findex gnus-article-sort-by-random @findex gnus-article-sort-by-number If you are using an unthreaded display for some strange reason or other, you have to fiddle with the @code{gnus-article-sort-functions} variable. It is very similar to the @code{gnus-thread-sort-functions}, except that it uses slightly different functions for article comparison. Available sorting predicate functions are @code{gnus-article-sort-by-number}, @code{gnus-article-sort-by-author}, @code{gnus-article-sort-by-subject}, @code{gnus-article-sort-by-date}, @code{gnus-article-sort-by-random}, and @code{gnus-article-sort-by-score}. If you want to sort an unthreaded summary display by subject, you could say something like: @lisp (setq gnus-article-sort-functions '(gnus-article-sort-by-number gnus-article-sort-by-subject)) @end lisp @node Asynchronous Fetching @section Asynchronous Article Fetching @cindex asynchronous article fetching @cindex article pre-fetch @cindex pre-fetch If you read your news from an @acronym{NNTP} server that's far away, the network latencies may make reading articles a chore. You have to wait for a while after pressing @kbd{n} to go to the next article before the article appears. Why can't Gnus just go ahead and fetch the article while you are reading the previous one? Why not, indeed. First, some caveats. There are some pitfalls to using asynchronous article fetching, especially the way Gnus does it. Let's say you are reading article 1, which is short, and article 2 is quite long, and you are not interested in reading that. Gnus does not know this, so it goes ahead and fetches article 2. You decide to read article 3, but since Gnus is in the process of fetching article 2, the connection is blocked. To avoid these situations, Gnus will open two (count 'em two) connections to the server. Some people may think this isn't a very nice thing to do, but I don't see any real alternatives. Setting up that extra connection takes some time, so Gnus startup will be slower. Gnus will fetch more articles than you will read. This will mean that the link between your machine and the @acronym{NNTP} server will become more loaded than if you didn't use article pre-fetch. The server itself will also become more loaded---both with the extra article requests, and the extra connection. Ok, so now you know that you shouldn't really use this thing@dots{} unless you really want to. @vindex gnus-asynchronous Here's how: Set @code{gnus-asynchronous} to @code{t}. The rest should happen automatically. @vindex gnus-use-article-prefetch You can control how many articles are to be pre-fetched by setting @code{gnus-use-article-prefetch}. This is 30 by default, which means that when you read an article in the group, the back end will pre-fetch the next 30 articles. If this variable is @code{t}, the back end will pre-fetch all the articles it can without bound. If it is @code{nil}, no pre-fetching will be done. @vindex gnus-async-prefetch-article-p @findex gnus-async-read-p There are probably some articles that you don't want to pre-fetch---read articles, for instance. The @code{gnus-async-prefetch-article-p} variable controls whether an article is to be pre-fetched. This function should return non-@code{nil} when the article in question is to be pre-fetched. The default is @code{gnus-async-read-p}, which returns @code{nil} on read articles. The function is called with an article data structure as the only parameter. If, for instance, you wish to pre-fetch only unread articles shorter than 100 lines, you could say something like: @lisp (defun my-async-short-unread-p (data) "Return non-nil for short, unread articles." (and (gnus-data-unread-p data) (< (mail-header-lines (gnus-data-header data)) 100))) (setq gnus-async-prefetch-article-p 'my-async-short-unread-p) @end lisp These functions will be called many, many times, so they should preferably be short and sweet to avoid slowing down Gnus too much. It's probably a good idea to byte-compile things like this. @vindex gnus-prefetched-article-deletion-strategy Articles have to be removed from the asynch buffer sooner or later. The @code{gnus-prefetched-article-deletion-strategy} says when to remove articles. This is a list that may contain the following elements: @table @code @item read Remove articles when they are read. @item exit Remove articles when exiting the group. @end table The default value is @code{(read exit)}. @c @vindex gnus-use-header-prefetch @c If @code{gnus-use-header-prefetch} is non-@code{nil}, prefetch articles @c from the next group. @node Article Caching @section Article Caching @cindex article caching @cindex caching If you have an @emph{extremely} slow @acronym{NNTP} connection, you may consider turning article caching on. Each article will then be stored locally under your home directory. As you may surmise, this could potentially use @emph{huge} amounts of disk space, as well as eat up all your inodes so fast it will make your head swim. In vodka. Used carefully, though, it could be just an easier way to save articles. @vindex gnus-use-long-file-name @vindex gnus-cache-directory @vindex gnus-use-cache To turn caching on, set @code{gnus-use-cache} to @code{t}. By default, all articles ticked or marked as dormant will then be copied over to your local cache (@code{gnus-cache-directory}). Whether this cache is flat or hierarchical is controlled by the @code{gnus-use-long-file-name} variable, as usual. When re-selecting a ticked or dormant article, it will be fetched from the cache instead of from the server. As articles in your cache will never expire, this might serve as a method of saving articles while still keeping them where they belong. Just mark all articles you want to save as dormant, and don't worry. When an article is marked as read, is it removed from the cache. @vindex gnus-cache-remove-articles @vindex gnus-cache-enter-articles The entering/removal of articles from the cache is controlled by the @code{gnus-cache-enter-articles} and @code{gnus-cache-remove-articles} variables. Both are lists of symbols. The first is @code{(ticked dormant)} by default, meaning that ticked and dormant articles will be put in the cache. The latter is @code{(read)} by default, meaning that articles marked as read are removed from the cache. Possibly symbols in these two lists are @code{ticked}, @code{dormant}, @code{unread} and @code{read}. @findex gnus-jog-cache So where does the massive article-fetching and storing come into the picture? The @code{gnus-jog-cache} command will go through all subscribed newsgroups, request all unread articles, score them, and store them in the cache. You should only ever, ever ever ever, use this command if 1) your connection to the @acronym{NNTP} server is really, really, really slow and 2) you have a really, really, really huge disk. Seriously. One way to cut down on the number of articles downloaded is to score unwanted articles down and have them marked as read. They will not then be downloaded by this command. @vindex gnus-uncacheable-groups @vindex gnus-cacheable-groups It is likely that you do not want caching on all groups. For instance, if your @code{nnml} mail is located under your home directory, it makes no sense to cache it somewhere else under your home directory. Unless you feel that it's neat to use twice as much space. To limit the caching, you could set @code{gnus-cacheable-groups} to a regexp of groups to cache, @samp{^nntp} for instance, or set the @code{gnus-uncacheable-groups} regexp to @samp{^nnml}, for instance. Both variables are @code{nil} by default. If a group matches both variables, the group is not cached. @findex gnus-cache-generate-nov-databases @findex gnus-cache-generate-active @vindex gnus-cache-active-file The cache stores information on what articles it contains in its active file (@code{gnus-cache-active-file}). If this file (or any other parts of the cache) becomes all messed up for some reason or other, Gnus offers two functions that will try to set things right. @kbd{M-x gnus-cache-generate-nov-databases} will (re)build all the @acronym{NOV} files, and @kbd{gnus-cache-generate-active} will (re)generate the active file. @findex gnus-cache-move-cache @code{gnus-cache-move-cache} will move your whole @code{gnus-cache-directory} to some other location. You get asked to where, isn't that cool? @node Persistent Articles @section Persistent Articles @cindex persistent articles Closely related to article caching, we have @dfn{persistent articles}. In fact, it's just a different way of looking at caching, and much more useful in my opinion. Say you're reading a newsgroup, and you happen on to some valuable gem that you want to keep and treasure forever. You'd normally just save it (using one of the many saving commands) in some file. The problem with that is that it's just, well, yucky. Ideally you'd prefer just having the article remain in the group where you found it forever; untouched by the expiry going on at the news server. This is what a @dfn{persistent article} is---an article that just won't be deleted. It's implemented using the normal cache functions, but you use two explicit commands for managing persistent articles: @table @kbd @item * @kindex * (Summary) @findex gnus-cache-enter-article Make the current article persistent (@code{gnus-cache-enter-article}). @item M-* @kindex M-* (Summary) @findex gnus-cache-remove-article Remove the current article from the persistent articles (@code{gnus-cache-remove-article}). This will normally delete the article. @end table Both these commands understand the process/prefix convention. To avoid having all ticked articles (and stuff) entered into the cache, you should set @code{gnus-use-cache} to @code{passive} if you're just interested in persistent articles: @lisp (setq gnus-use-cache 'passive) @end lisp @node Article Backlog @section Article Backlog @cindex backlog @cindex article backlog If you have a slow connection, but the idea of using caching seems unappealing to you (and it is, really), you can help the situation some by switching on the @dfn{backlog}. This is where Gnus will buffer already read articles so that it doesn't have to re-fetch articles you've already read. This only helps if you are in the habit of re-selecting articles you've recently read, of course. If you never do that, turning the backlog on will slow Gnus down a little bit, and increase memory usage some. @vindex gnus-keep-backlog If you set @code{gnus-keep-backlog} to a number @var{n}, Gnus will store at most @var{n} old articles in a buffer for later re-fetching. If this variable is non-@code{nil} and is not a number, Gnus will store @emph{all} read articles, which means that your Emacs will grow without bound before exploding and taking your machine down with you. I put that in there just to keep y'all on your toes. The default value is 20. @node Saving Articles @section Saving Articles @cindex saving articles Gnus can save articles in a number of ways. Below is the documentation for saving articles in a fairly straight-forward fashion (i.e., little processing of the article is done before it is saved). For a different approach (uudecoding, unsharing) you should use @code{gnus-uu} (@pxref{Decoding Articles}). For the commands listed here, the target is a file. If you want to save to a group, see the @kbd{B c} (@code{gnus-summary-copy-article}) command (@pxref{Mail Group Commands}). @vindex gnus-save-all-headers If @code{gnus-save-all-headers} is non-@code{nil}, Gnus will not delete unwanted headers before saving the article. @vindex gnus-saved-headers If the preceding variable is @code{nil}, all headers that match the @code{gnus-saved-headers} regexp will be kept, while the rest will be deleted before saving. @table @kbd @item O o @itemx o @kindex O o (Summary) @kindex o (Summary) @findex gnus-summary-save-article @c @icon{gnus-summary-save-article} Save the current article using the default article saver (@code{gnus-summary-save-article}). @item O m @kindex O m (Summary) @findex gnus-summary-save-article-mail Save the current article in a Unix mail box (mbox) file (@code{gnus-summary-save-article-mail}). @item O r @kindex O r (Summary) @findex gnus-summary-save-article-rmail Save the current article in Rmail format (@code{gnus-summary-save-article-rmail}). @item O f @kindex O f (Summary) @findex gnus-summary-save-article-file @c @icon{gnus-summary-save-article-file} Save the current article in plain file format (@code{gnus-summary-save-article-file}). @item O F @kindex O F (Summary) @findex gnus-summary-write-article-file Write the current article in plain file format, overwriting any previous file contents (@code{gnus-summary-write-article-file}). @item O b @kindex O b (Summary) @findex gnus-summary-save-article-body-file Save the current article body in plain file format (@code{gnus-summary-save-article-body-file}). @item O h @kindex O h (Summary) @findex gnus-summary-save-article-folder Save the current article in mh folder format (@code{gnus-summary-save-article-folder}). @item O v @kindex O v (Summary) @findex gnus-summary-save-article-vm Save the current article in a VM folder (@code{gnus-summary-save-article-vm}). @item O p @itemx | @kindex O p (Summary) @kindex | (Summary) @findex gnus-summary-pipe-output Save the current article in a pipe. Uhm, like, what I mean is---Pipe the current article to a process (@code{gnus-summary-pipe-output}). If given a symbolic prefix (@pxref{Symbolic Prefixes}), include the complete headers in the piped output. @item O P @kindex O P (Summary) @findex gnus-summary-muttprint @vindex gnus-summary-muttprint-program Save the current article into muttprint. That is, print it using the external program @uref{http://muttprint.sourceforge.net/, Muttprint}. The program name and options to use is controlled by the variable @code{gnus-summary-muttprint-program}. (@code{gnus-summary-muttprint}). @end table @vindex gnus-prompt-before-saving All these commands use the process/prefix convention (@pxref{Process/Prefix}). If you save bunches of articles using these functions, you might get tired of being prompted for files to save each and every article in. The prompting action is controlled by the @code{gnus-prompt-before-saving} variable, which is @code{always} by default, giving you that excessive prompting action you know and loathe. If you set this variable to @code{t} instead, you'll be prompted just once for each series of articles you save. If you like to really have Gnus do all your thinking for you, you can even set this variable to @code{nil}, which means that you will never be prompted for files to save articles in. Gnus will simply save all the articles in the default files. @vindex gnus-default-article-saver You can customize the @code{gnus-default-article-saver} variable to make Gnus do what you want it to. You can use any of the eight ready-made functions below, or you can create your own. @table @code @item gnus-summary-save-in-rmail @findex gnus-summary-save-in-rmail @vindex gnus-rmail-save-name @findex gnus-plain-save-name This is the default format, @dfn{Babyl}. Uses the function in the @code{gnus-rmail-save-name} variable to get a file name to save the article in. The default is @code{gnus-plain-save-name}. @item gnus-summary-save-in-mail @findex gnus-summary-save-in-mail @vindex gnus-mail-save-name Save in a Unix mail (mbox) file. Uses the function in the @code{gnus-mail-save-name} variable to get a file name to save the article in. The default is @code{gnus-plain-save-name}. @item gnus-summary-save-in-file @findex gnus-summary-save-in-file @vindex gnus-file-save-name @findex gnus-numeric-save-name Append the article straight to an ordinary file. Uses the function in the @code{gnus-file-save-name} variable to get a file name to save the article in. The default is @code{gnus-numeric-save-name}. @item gnus-summary-write-to-file @findex gnus-summary-write-to-file Write the article straight to an ordinary file. The file is overwritten if it exists. Uses the function in the @code{gnus-file-save-name} variable to get a file name to save the article in. The default is @code{gnus-numeric-save-name}. @item gnus-summary-save-body-in-file @findex gnus-summary-save-body-in-file Append the article body to an ordinary file. Uses the function in the @code{gnus-file-save-name} variable to get a file name to save the article in. The default is @code{gnus-numeric-save-name}. @item gnus-summary-write-body-to-file @findex gnus-summary-write-body-to-file Write the article body straight to an ordinary file. The file is overwritten if it exists. Uses the function in the @code{gnus-file-save-name} variable to get a file name to save the article in. The default is @code{gnus-numeric-save-name}. @item gnus-summary-save-in-folder @findex gnus-summary-save-in-folder @findex gnus-folder-save-name @findex gnus-Folder-save-name @vindex gnus-folder-save-name @cindex rcvstore @cindex MH folders Save the article to an MH folder using @code{rcvstore} from the MH library. Uses the function in the @code{gnus-folder-save-name} variable to get a file name to save the article in. The default is @code{gnus-folder-save-name}, but you can also use @code{gnus-Folder-save-name}, which creates capitalized names. @item gnus-summary-save-in-vm @findex gnus-summary-save-in-vm Save the article in a VM folder. You have to have the VM mail reader to use this setting. @end table The symbol of each function may have the following properties: @table @code @item :decode The value non-@code{nil} means save decoded articles. This is meaningful only with @code{gnus-summary-save-in-file}, @code{gnus-summary-save-body-in-file}, @code{gnus-summary-write-to-file}, and @code{gnus-summary-write-body-to-file}. @item :function The value specifies an alternative function which appends, not overwrites, articles to a file. This implies that when saving many articles at a time, @code{gnus-prompt-before-saving} is bound to @code{t} and all articles are saved in a single file. This is meaningful only with @code{gnus-summary-write-to-file} and @code{gnus-summary-write-body-to-file}. @item :headers The value specifies the symbol of a variable of which the value specifies headers to be saved. If it is omitted, @code{gnus-save-all-headers} and @code{gnus-saved-headers} control what headers should be saved. @end table @vindex gnus-article-save-directory All of these functions, except for the last one, will save the article in the @code{gnus-article-save-directory}, which is initialized from the @env{SAVEDIR} environment variable. This is @file{~/News/} by default. As you can see above, the functions use different functions to find a suitable name of a file to save the article in. Below is a list of available functions that generate names: @table @code @item gnus-Numeric-save-name @findex gnus-Numeric-save-name File names like @file{~/News/Alt.andrea-dworkin/45}. @item gnus-numeric-save-name @findex gnus-numeric-save-name File names like @file{~/News/alt.andrea-dworkin/45}. @item gnus-Plain-save-name @findex gnus-Plain-save-name File names like @file{~/News/Alt.andrea-dworkin}. @item gnus-plain-save-name @findex gnus-plain-save-name File names like @file{~/News/alt.andrea-dworkin}. @item gnus-sender-save-name @findex gnus-sender-save-name File names like @file{~/News/larsi}. @end table @vindex gnus-split-methods You can have Gnus suggest where to save articles by plonking a regexp into the @code{gnus-split-methods} alist. For instance, if you would like to save articles related to Gnus in the file @file{gnus-stuff}, and articles related to VM in @file{vm-stuff}, you could set this variable to something like: @lisp (("^Subject:.*gnus\\|^Newsgroups:.*gnus" "gnus-stuff") ("^Subject:.*vm\\|^Xref:.*vm" "vm-stuff") (my-choosing-function "../other-dir/my-stuff") ((equal gnus-newsgroup-name "mail.misc") "mail-stuff")) @end lisp We see that this is a list where each element is a list that has two elements---the @dfn{match} and the @dfn{file}. The match can either be a string (in which case it is used as a regexp to match on the article head); it can be a symbol (which will be called as a function with the group name as a parameter); or it can be a list (which will be @code{eval}ed). If any of these actions have a non-@code{nil} result, the @dfn{file} will be used as a default prompt. In addition, the result of the operation itself will be used if the function or form called returns a string or a list of strings. You basically end up with a list of file names that might be used when saving the current article. (All matches'' will be used.) You will then be prompted for what you really want to use as a name, with file name completion over the results from applying this variable. This variable is @code{((gnus-article-archive-name))} by default, which means that Gnus will look at the articles it saves for an @code{Archive-name} line and use that as a suggestion for the file name. Here's an example function to clean up file names somewhat. If you have lots of mail groups called things like @samp{nnml:mail.whatever}, you may want to chop off the beginning of these group names before creating the file name to save to. The following will do just that: @lisp (defun my-save-name (group) (when (string-match "^nnml:mail." group) (substring group (match-end 0)))) (setq gnus-split-methods '((gnus-article-archive-name) (my-save-name))) @end lisp @vindex gnus-use-long-file-name Finally, you have the @code{gnus-use-long-file-name} variable. If it is @code{nil}, all the preceding functions will replace all periods (@samp{.}) in the group names with slashes (@samp{/})---which means that the functions will generate hierarchies of directories instead of having all the files in the top level directory (@file{~/News/alt/andrea-dworkin} instead of @file{~/News/alt.andrea-dworkin}.) This variable is @code{t} by default on most systems. However, for historical reasons, this is @code{nil} on Xenix and usg-unix-v machines by default. This function also affects kill and score file names. If this variable is a list, and the list contains the element @code{not-score}, long file names will not be used for score files, if it contains the element @code{not-save}, long file names will not be used for saving, and if it contains the element @code{not-kill}, long file names will not be used for kill files. If you'd like to save articles in a hierarchy that looks something like a spool, you could @lisp (setq gnus-use-long-file-name '(not-save)) ; @r{to get a hierarchy} (setq gnus-default-article-saver 'gnus-summary-save-in-file) ; @r{no encoding} @end lisp Then just save with @kbd{o}. You'd then read this hierarchy with ephemeral @code{nneething} groups---@kbd{G D} in the group buffer, and the top level directory as the argument (@file{~/News/}). Then just walk around to the groups/directories with @code{nneething}. @node Decoding Articles @section Decoding Articles @cindex decoding articles Sometime users post articles (or series of articles) that have been encoded in some way or other. Gnus can decode them for you. @menu * Uuencoded Articles:: Uudecode articles. * Shell Archives:: Unshar articles. * PostScript Files:: Split PostScript. * Other Files:: Plain save and binhex. * Decoding Variables:: Variables for a happy decoding. * Viewing Files:: You want to look at the result of the decoding? @end menu @cindex series @cindex article series All these functions use the process/prefix convention (@pxref{Process/Prefix}) for finding out what articles to work on, with the extension that a single article'' means a single series''. Gnus can find out by itself what articles belong to a series, decode all the articles and unpack/view/save the resulting file(s). Gnus guesses what articles are in the series according to the following simplish rule: The subjects must be (nearly) identical, except for the last two numbers of the line. (Spaces are largely ignored, however.) For example: If you choose a subject called @samp{cat.gif (2/3)}, Gnus will find all the articles that match the regexp @samp{^cat.gif ([0-9]+/[0-9]+).*$}.

Subjects that are non-standard, like @samp{cat.gif (2/3) Part 6 of a
series}, will not be properly recognized by any of the automatic viewing
commands, and you have to mark the articles manually with @kbd{#}.

@node Uuencoded Articles
@subsection Uuencoded Articles
@cindex uudecode
@cindex uuencoded articles

@table @kbd

@item X u
@kindex X u (Summary)
@findex gnus-uu-decode-uu
@c @icon{gnus-uu-decode-uu}
Uudecodes the current series (@code{gnus-uu-decode-uu}).

@item X U
@kindex X U (Summary)
@findex gnus-uu-decode-uu-and-save
Uudecodes and saves the current series
(@code{gnus-uu-decode-uu-and-save}).

@item X v u
@kindex X v u (Summary)
@findex gnus-uu-decode-uu-view
Uudecodes and views the current series (@code{gnus-uu-decode-uu-view}).

@item X v U
@kindex X v U (Summary)
@findex gnus-uu-decode-uu-and-save-view
Uudecodes, views and saves the current series
(@code{gnus-uu-decode-uu-and-save-view}).

@end table

Remember that these all react to the presence of articles marked with
the process mark.  If, for instance, you'd like to decode and save an
entire newsgroup, you'd typically do @kbd{M P a}
(@code{gnus-uu-mark-all}) and then @kbd{X U}
(@code{gnus-uu-decode-uu-and-save}).

All this is very much different from how @code{gnus-uu} worked with
@sc{gnus 4.1}, where you had explicit keystrokes for everything under
the sun.  This version of @code{gnus-uu} generally assumes that you mark
articles in some way (@pxref{Setting Process Marks}) and then press
@kbd{X u}.

@vindex gnus-uu-notify-files
Note: When trying to decode articles that have names matching
@code{gnus-uu-notify-files}, which is hard-coded to
@samp{[Cc][Ii][Nn][Dd][Yy][0-9]+.\$$gif\\|jpg\$$}, @code{gnus-uu} will
automatically post an article on @samp{comp.unix.wizards} saying that
you have just viewed the file in question.  This feature can't be turned
off.

@node Shell Archives
@subsection Shell Archives
@cindex unshar
@cindex shell archives
@cindex shared articles

Shell archives (shar files'') used to be a popular way to distribute
sources, but it isn't used all that much today.  In any case, we have
some commands to deal with these:

@table @kbd

@item X s
@kindex X s (Summary)
@findex gnus-uu-decode-unshar
Unshars the current series (@code{gnus-uu-decode-unshar}).

@item X S
@kindex X S (Summary)
@findex gnus-uu-decode-unshar-and-save
Unshars and saves the current series (@code{gnus-uu-decode-unshar-and-save}).

@item X v s
@kindex X v s (Summary)
@findex gnus-uu-decode-unshar-view
Unshars and views the current series (@code{gnus-uu-decode-unshar-view}).

@item X v S
@kindex X v S (Summary)
@findex gnus-uu-decode-unshar-and-save-view
Unshars, views and saves the current series
(@code{gnus-uu-decode-unshar-and-save-view}).
@end table

@node PostScript Files
@subsection PostScript Files
@cindex PostScript

@table @kbd

@item X p
@kindex X p (Summary)
@findex gnus-uu-decode-postscript
Unpack the current PostScript series (@code{gnus-uu-decode-postscript}).

@item X P
@kindex X P (Summary)
@findex gnus-uu-decode-postscript-and-save
Unpack and save the current PostScript series
(@code{gnus-uu-decode-postscript-and-save}).

@item X v p
@kindex X v p (Summary)
@findex gnus-uu-decode-postscript-view
View the current PostScript series
(@code{gnus-uu-decode-postscript-view}).

@item X v P
@kindex X v P (Summary)
@findex gnus-uu-decode-postscript-and-save-view
View and save the current PostScript series
(@code{gnus-uu-decode-postscript-and-save-view}).
@end table

@node Other Files
@subsection Other Files

@table @kbd
@item X o
@kindex X o (Summary)
@findex gnus-uu-decode-save
Save the current series
(@code{gnus-uu-decode-save}).

@item X b
@kindex X b (Summary)
@findex gnus-uu-decode-binhex
Unbinhex the current series (@code{gnus-uu-decode-binhex}).  This
doesn't really work yet.
@end table

@node Decoding Variables
@subsection Decoding Variables

* Rule Variables::              Variables that say how a file is to be viewed.
* Other Decode Variables::      Other decode variables.
* Uuencoding and Posting::      Variables for customizing uuencoding.

@node Rule Variables
@subsubsection Rule Variables
@cindex rule variables

Gnus uses @dfn{rule variables} to decide how to view a file.  All these
variables are of the form

@lisp
(list '(regexp1 command2)
'(regexp2 command2)
...)
@end lisp

@table @code

@item gnus-uu-user-view-rules
@vindex gnus-uu-user-view-rules
@cindex sox
This variable is consulted first when viewing files.  If you wish to use,
for instance, @code{sox} to convert an @file{.au} sound file, you could
say something like:
@lisp
(setq gnus-uu-user-view-rules
(list '("\\\\.au$" "sox %s -t .aiff > /dev/audio"))) @end lisp @item gnus-uu-user-view-rules-end @vindex gnus-uu-user-view-rules-end This variable is consulted if Gnus couldn't make any matches from the user and default view rules. @item gnus-uu-user-archive-rules @vindex gnus-uu-user-archive-rules This variable can be used to say what commands should be used to unpack archives. @end table @node Other Decode Variables @subsubsection Other Decode Variables @table @code @vindex gnus-uu-grabbed-file-functions @item gnus-uu-grabbed-file-functions All functions in this list will be called right after each file has been successfully decoded---so that you can move or view files right away, and don't have to wait for all files to be decoded before you can do anything. Ready-made functions you can put in this list are: @table @code @item gnus-uu-grab-view @findex gnus-uu-grab-view View the file. @item gnus-uu-grab-move @findex gnus-uu-grab-move Move the file (if you're using a saving function.) @end table @item gnus-uu-be-dangerous @vindex gnus-uu-be-dangerous Specifies what to do if unusual situations arise during decoding. If @code{nil}, be as conservative as possible. If @code{t}, ignore things that didn't work, and overwrite existing files. Otherwise, ask each time. @item gnus-uu-ignore-files-by-name @vindex gnus-uu-ignore-files-by-name Files with name matching this regular expression won't be viewed. @item gnus-uu-ignore-files-by-type @vindex gnus-uu-ignore-files-by-type Files with a @acronym{MIME} type matching this variable won't be viewed. Note that Gnus tries to guess what type the file is based on the name. @code{gnus-uu} is not a @acronym{MIME} package (yet), so this is slightly kludgey. @item gnus-uu-tmp-dir @vindex gnus-uu-tmp-dir Where @code{gnus-uu} does its work. @item gnus-uu-do-not-unpack-archives @vindex gnus-uu-do-not-unpack-archives Non-@code{nil} means that @code{gnus-uu} won't peek inside archives looking for files to display. @item gnus-uu-view-and-save @vindex gnus-uu-view-and-save Non-@code{nil} means that the user will always be asked to save a file after viewing it. @item gnus-uu-ignore-default-view-rules @vindex gnus-uu-ignore-default-view-rules Non-@code{nil} means that @code{gnus-uu} will ignore the default viewing rules. @item gnus-uu-ignore-default-archive-rules @vindex gnus-uu-ignore-default-archive-rules Non-@code{nil} means that @code{gnus-uu} will ignore the default archive unpacking commands. @item gnus-uu-kill-carriage-return @vindex gnus-uu-kill-carriage-return Non-@code{nil} means that @code{gnus-uu} will strip all carriage returns from articles. @item gnus-uu-unmark-articles-not-decoded @vindex gnus-uu-unmark-articles-not-decoded Non-@code{nil} means that @code{gnus-uu} will mark unsuccessfully decoded articles as unread. @item gnus-uu-correct-stripped-uucode @vindex gnus-uu-correct-stripped-uucode Non-@code{nil} means that @code{gnus-uu} will @emph{try} to fix uuencoded files that have had trailing spaces deleted. @item gnus-uu-pre-uudecode-hook @vindex gnus-uu-pre-uudecode-hook Hook run before sending a message to @code{uudecode}. @item gnus-uu-view-with-metamail @vindex gnus-uu-view-with-metamail @cindex metamail Non-@code{nil} means that @code{gnus-uu} will ignore the viewing commands defined by the rule variables and just fudge a @acronym{MIME} content type based on the file name. The result will be fed to @code{metamail} for viewing. @item gnus-uu-save-in-digest @vindex gnus-uu-save-in-digest Non-@code{nil} means that @code{gnus-uu}, when asked to save without decoding, will save in digests. If this variable is @code{nil}, @code{gnus-uu} will just save everything in a file without any embellishments. The digesting almost conforms to RFC 1153---no easy way to specify any meaningful volume and issue numbers were found, so I simply dropped them. @end table @node Uuencoding and Posting @subsubsection Uuencoding and Posting @table @code @item gnus-uu-post-include-before-composing @vindex gnus-uu-post-include-before-composing Non-@code{nil} means that @code{gnus-uu} will ask for a file to encode before you compose the article. If this variable is @code{t}, you can either include an encoded file with @kbd{C-c C-i} or have one included for you when you post the article. @item gnus-uu-post-length @vindex gnus-uu-post-length Maximum length of an article. The encoded file will be split into how many articles it takes to post the entire file. @item gnus-uu-post-threaded @vindex gnus-uu-post-threaded Non-@code{nil} means that @code{gnus-uu} will post the encoded file in a thread. This may not be smart, as no other decoder I have seen is able to follow threads when collecting uuencoded articles. (Well, I have seen one package that does that---@code{gnus-uu}, but somehow, I don't think that counts@dots{}) Default is @code{nil}. @item gnus-uu-post-separate-description @vindex gnus-uu-post-separate-description Non-@code{nil} means that the description will be posted in a separate article. The first article will typically be numbered (0/x). If this variable is @code{nil}, the description the user enters will be included at the beginning of the first article, which will be numbered (1/x). Default is @code{t}. @end table @node Viewing Files @subsection Viewing Files @cindex viewing files @cindex pseudo-articles After decoding, if the file is some sort of archive, Gnus will attempt to unpack the archive and see if any of the files in the archive can be viewed. For instance, if you have a gzipped tar file @file{pics.tar.gz} containing the files @file{pic1.jpg} and @file{pic2.gif}, Gnus will uncompress and de-tar the main file, and then view the two pictures. This unpacking process is recursive, so if the archive contains archives of archives, it'll all be unpacked. Finally, Gnus will normally insert a @dfn{pseudo-article} for each extracted file into the summary buffer. If you go to these articles'', you will be prompted for a command to run (usually Gnus will make a suggestion), and then the command will be run. @vindex gnus-view-pseudo-asynchronously If @code{gnus-view-pseudo-asynchronously} is @code{nil}, Emacs will wait until the viewing is done before proceeding. @vindex gnus-view-pseudos If @code{gnus-view-pseudos} is @code{automatic}, Gnus will not insert the pseudo-articles into the summary buffer, but view them immediately. If this variable is @code{not-confirm}, the user won't even be asked for a confirmation before viewing is done. @vindex gnus-view-pseudos-separately If @code{gnus-view-pseudos-separately} is non-@code{nil}, one pseudo-article will be created for each file to be viewed. If @code{nil}, all files that use the same viewing command will be given as a list of parameters to that command. @vindex gnus-insert-pseudo-articles If @code{gnus-insert-pseudo-articles} is non-@code{nil}, insert pseudo-articles when decoding. It is @code{t} by default. So; there you are, reading your @emph{pseudo-articles} in your @emph{virtual newsgroup} from the @emph{virtual server}; and you think: Why isn't anything real anymore? How did we get here? @node Article Treatment @section Article Treatment Reading through this huge manual, you may have quite forgotten that the object of newsreaders is to actually, like, read what people have written. Reading articles. Unfortunately, people are quite bad at writing, so there are tons of functions and variables to make reading these articles easier. @menu * Article Highlighting:: You want to make the article look like fruit salad. * Article Fontisizing:: Making emphasized text look nice. * Article Hiding:: You also want to make certain info go away. * Article Washing:: Lots of way-neat functions to make life better. * Article Header:: Doing various header transformations. * Article Buttons:: Click on URLs, Message-IDs, addresses and the like. * Article Button Levels:: Controlling appearance of buttons. * Article Date:: Grumble, UT! * Article Display:: Display various stuff---X-Face, Picons, Smileys * Article Signature:: What is a signature? * Article Miscellanea:: Various other stuff. @end menu @node Article Highlighting @subsection Article Highlighting @cindex highlighting Not only do you want your article buffer to look like fruit salad, but you want it to look like technicolor fruit salad. @table @kbd @item W H a @kindex W H a (Summary) @findex gnus-article-highlight @findex gnus-article-maybe-highlight Do much highlighting of the current article (@code{gnus-article-highlight}). This function highlights header, cited text, the signature, and adds buttons to the body and the head. @item W H h @kindex W H h (Summary) @findex gnus-article-highlight-headers @vindex gnus-header-face-alist Highlight the headers (@code{gnus-article-highlight-headers}). The highlighting will be done according to the @code{gnus-header-face-alist} variable, which is a list where each element has the form @code{(@var{regexp} @var{name} @var{content})}. @var{regexp} is a regular expression for matching the header, @var{name} is the face used for highlighting the header name (@pxref{Faces and Fonts}) and @var{content} is the face for highlighting the header value. The first match made will be used. Note that @var{regexp} shouldn't have @samp{^} prepended---Gnus will add one. @item W H c @kindex W H c (Summary) @findex gnus-article-highlight-citation Highlight cited text (@code{gnus-article-highlight-citation}). Some variables to customize the citation highlights: @table @code @vindex gnus-cite-parse-max-size @item gnus-cite-parse-max-size If the article size in bytes is bigger than this variable (which is 25000 by default), no citation highlighting will be performed. @item gnus-cite-max-prefix @vindex gnus-cite-max-prefix Maximum possible length for a citation prefix (default 20). @item gnus-cite-face-list @vindex gnus-cite-face-list List of faces used for highlighting citations (@pxref{Faces and Fonts}). When there are citations from multiple articles in the same message, Gnus will try to give each citation from each article its own face. This should make it easier to see who wrote what. @item gnus-supercite-regexp @vindex gnus-supercite-regexp Regexp matching normal Supercite attribution lines. @item gnus-supercite-secondary-regexp @vindex gnus-supercite-secondary-regexp Regexp matching mangled Supercite attribution lines. @item gnus-cite-minimum-match-count @vindex gnus-cite-minimum-match-count Minimum number of identical prefixes we have to see before we believe that it's a citation. @item gnus-cite-attribution-prefix @vindex gnus-cite-attribution-prefix Regexp matching the beginning of an attribution line. @item gnus-cite-attribution-suffix @vindex gnus-cite-attribution-suffix Regexp matching the end of an attribution line. @item gnus-cite-attribution-face @vindex gnus-cite-attribution-face Face used for attribution lines. It is merged with the face for the cited text belonging to the attribution. @item gnus-cite-ignore-quoted-from @vindex gnus-cite-ignore-quoted-from If non-@code{nil}, no citation highlighting will be performed on lines beginning with @samp{>From }. Those lines may have been quoted by MTAs in order not to mix up with the envelope From line. The default value is @code{t}. @end table @item W H s @kindex W H s (Summary) @vindex gnus-signature-separator @vindex gnus-signature-face @findex gnus-article-highlight-signature Highlight the signature (@code{gnus-article-highlight-signature}). Everything after @code{gnus-signature-separator} (@pxref{Article Signature}) in an article will be considered a signature and will be highlighted with @code{gnus-signature-face}, which is @code{italic} by default. @end table @xref{Customizing Articles}, for how to highlight articles automatically. @node Article Fontisizing @subsection Article Fontisizing @cindex emphasis @cindex article emphasis @findex gnus-article-emphasize @kindex W e (Summary) People commonly add emphasis to words in news articles by writing things like @samp{_this_} or @samp{*this*} or @samp{/this/}. Gnus can make this look nicer by running the article through the @kbd{W e} (@code{gnus-article-emphasize}) command. @vindex gnus-emphasis-alist How the emphasis is computed is controlled by the @code{gnus-emphasis-alist} variable. This is an alist where the first element is a regular expression to be matched. The second is a number that says what regular expression grouping is used to find the entire emphasized word. The third is a number that says what regexp grouping should be displayed and highlighted. (The text between these two groupings will be hidden.) The fourth is the face used for highlighting. @lisp (setq gnus-emphasis-alist '(("_\$$\\w+\$$_" 0 1 gnus-emphasis-underline) ("\\*\$$\\w+\$$\\*" 0 1 gnus-emphasis-bold))) @end lisp @cindex slash @cindex asterisk @cindex underline @cindex / @cindex * @vindex gnus-emphasis-underline @vindex gnus-emphasis-bold @vindex gnus-emphasis-italic @vindex gnus-emphasis-underline-bold @vindex gnus-emphasis-underline-italic @vindex gnus-emphasis-bold-italic @vindex gnus-emphasis-underline-bold-italic By default, there are seven rules, and they use the following faces: @code{gnus-emphasis-bold}, @code{gnus-emphasis-italic}, @code{gnus-emphasis-underline}, @code{gnus-emphasis-bold-italic}, @code{gnus-emphasis-underline-italic}, @code{gnus-emphasis-underline-bold}, and @code{gnus-emphasis-underline-bold-italic}. If you want to change these faces, you can either use @kbd{M-x customize}, or you can use @code{copy-face}. For instance, if you want to make @code{gnus-emphasis-italic} use a red face instead, you could say something like: @lisp (copy-face 'red 'gnus-emphasis-italic) @end lisp @vindex gnus-group-highlight-words-alist If you want to highlight arbitrary words, you can use the @code{gnus-group-highlight-words-alist} variable, which uses the same syntax as @code{gnus-emphasis-alist}. The @code{highlight-words} group parameter (@pxref{Group Parameters}) can also be used. @xref{Customizing Articles}, for how to fontize articles automatically. @node Article Hiding @subsection Article Hiding @cindex article hiding Or rather, hiding certain things in each article. There usually is much too much cruft in most articles. @table @kbd @item W W a @kindex W W a (Summary) @findex gnus-article-hide Do quite a lot of hiding on the article buffer (@kbd{gnus-article-hide}). In particular, this function will hide headers, @acronym{PGP}, cited text and the signature. @item W W h @kindex W W h (Summary) @findex gnus-article-hide-headers Hide headers (@code{gnus-article-hide-headers}). @xref{Hiding Headers}. @item W W b @kindex W W b (Summary) @findex gnus-article-hide-boring-headers Hide headers that aren't particularly interesting (@code{gnus-article-hide-boring-headers}). @xref{Hiding Headers}. @item W W s @kindex W W s (Summary) @findex gnus-article-hide-signature Hide signature (@code{gnus-article-hide-signature}). @xref{Article Signature}. @item W W l @kindex W W l (Summary) @findex gnus-article-hide-list-identifiers @vindex gnus-list-identifiers Strip list identifiers specified in @code{gnus-list-identifiers}. These are strings some mailing list servers add to the beginning of all @code{Subject} headers---for example, @samp{[zebra 4711]}. Any leading @samp{Re: } is skipped before stripping. @code{gnus-list-identifiers} may not contain @code{\$$..\$$}. @table @code @item gnus-list-identifiers @vindex gnus-list-identifiers A regular expression that matches list identifiers to be removed from subject. This can also be a list of regular expressions. @end table @item W W P @kindex W W P (Summary) @findex gnus-article-hide-pem Hide @acronym{PEM} (privacy enhanced messages) cruft (@code{gnus-article-hide-pem}). @item W W B @kindex W W B (Summary) @findex gnus-article-strip-banner @vindex gnus-article-banner-alist @vindex gnus-article-address-banner-alist @cindex banner @cindex OneList @cindex stripping advertisements @cindex advertisements Strip the banner specified by the @code{banner} group parameter (@code{gnus-article-strip-banner}). This is mainly used to hide those annoying banners and/or signatures that some mailing lists and moderated groups adds to all the messages. The way to use this function is to add the @code{banner} group parameter (@pxref{Group Parameters}) to the group you want banners stripped from. The parameter either be a string, which will be interpreted as a regular expression matching text to be removed, or the symbol @code{signature}, meaning that the (last) signature should be removed, or other symbol, meaning that the corresponding regular expression in @code{gnus-article-banner-alist} is used. Regardless of a group, you can hide things like advertisements only when the sender of an article has a certain mail address specified in @code{gnus-article-address-banner-alist}. @table @code @item gnus-article-address-banner-alist @vindex gnus-article-address-banner-alist Alist of mail addresses and banners. Each element has the form @code{(@var{address} . @var{banner})}, where @var{address} is a regexp matching a mail address in the From header, @var{banner} is one of a symbol @code{signature}, an item in @code{gnus-article-banner-alist}, a regexp and @code{nil}. If @var{address} matches author's mail address, it will remove things like advertisements. For example, if a sender has the mail address @samp{hail@@yoo-hoo.co.jp} and there is a banner something like @samp{Do You Yoo-hoo!?} in all articles he sends, you can use the following element to remove them: @lisp ("@@yoo-hoo\\.co\\.jp\\'" . "\n_+\nDo You Yoo-hoo!\\?\n.*\n.*\n") @end lisp @end table @item W W c @kindex W W c (Summary) @findex gnus-article-hide-citation Hide citation (@code{gnus-article-hide-citation}). Some variables for customizing the hiding: @table @code @item gnus-cited-opened-text-button-line-format @itemx gnus-cited-closed-text-button-line-format @vindex gnus-cited-closed-text-button-line-format @vindex gnus-cited-opened-text-button-line-format Gnus adds buttons to show where the cited text has been hidden, and to allow toggle hiding the text. The format of the variable is specified by these format-like variable (@pxref{Formatting Variables}). These specs are valid: @table @samp @item b Starting point of the hidden text. @item e Ending point of the hidden text. @item l Number of characters in the hidden region. @item n Number of lines of hidden text. @end table @item gnus-cited-lines-visible @vindex gnus-cited-lines-visible The number of lines at the beginning of the cited text to leave shown. This can also be a cons cell with the number of lines at the top and bottom of the text, respectively, to remain visible. @end table @item W W C-c @kindex W W C-c (Summary) @findex gnus-article-hide-citation-maybe Hide citation (@code{gnus-article-hide-citation-maybe}) depending on the following two variables: @table @code @item gnus-cite-hide-percentage @vindex gnus-cite-hide-percentage If the cited text is of a bigger percentage than this variable (default 50), hide the cited text. @item gnus-cite-hide-absolute @vindex gnus-cite-hide-absolute The cited text must have at least this length (default 10) before it is hidden. @end table @item W W C @kindex W W C (Summary) @findex gnus-article-hide-citation-in-followups Hide cited text in articles that aren't roots (@code{gnus-article-hide-citation-in-followups}). This isn't very useful as an interactive command, but might be a handy function to stick have happen automatically (@pxref{Customizing Articles}). @end table All these hiding'' commands are toggles, but if you give a negative prefix to these commands, they will show what they have previously hidden. If you give a positive prefix, they will always hide. Also @pxref{Article Highlighting} for further variables for citation customization. @xref{Customizing Articles}, for how to hide article elements automatically. @node Article Washing @subsection Article Washing @cindex washing @cindex article washing We call this article washing'' for a really good reason. Namely, the @kbd{A} key was taken, so we had to use the @kbd{W} key instead. @dfn{Washing} is defined by us as changing something from something to something else'', but normally results in something looking better. Cleaner, perhaps. @xref{Customizing Articles}, if you want to change how Gnus displays articles by default. @table @kbd @item C-u g This is not really washing, it's sort of the opposite of washing. If you type this, you see the article exactly as it exists on disk or on the server. @item g Force redisplaying of the current article (@code{gnus-summary-show-article}). This is also not really washing. If you type this, you see the article without any previously applied interactive Washing functions but with all default treatments (@pxref{Customizing Articles}). @item W l @kindex W l (Summary) @findex gnus-summary-stop-page-breaking Remove page breaks from the current article (@code{gnus-summary-stop-page-breaking}). @xref{Misc Article}, for page delimiters. @item W r @kindex W r (Summary) @findex gnus-summary-caesar-message @c @icon{gnus-summary-caesar-message} Do a Caesar rotate (rot13) on the article buffer (@code{gnus-summary-caesar-message}). Unreadable articles that tell you to read them with Caesar rotate or rot13. (Typically offensive jokes and such.) It's commonly called rot13'' because each letter is rotated 13 positions in the alphabet, e. g. @samp{B} (letter #2) -> @samp{O} (letter #15). It is sometimes referred to as Caesar rotate'' because Caesar is rumored to have employed this form of, uh, somewhat weak encryption. @item W m @kindex W m (Summary) @findex gnus-summary-morse-message Morse decode the article buffer (@code{gnus-summary-morse-message}). @item W t @item t @kindex W t (Summary) @kindex t (Summary) @findex gnus-summary-toggle-header Toggle whether to display all headers in the article buffer (@code{gnus-summary-toggle-header}). @item W v @kindex W v (Summary) @findex gnus-summary-verbose-headers Toggle whether to display all headers in the article buffer permanently (@code{gnus-summary-verbose-headers}). @item W o @kindex W o (Summary) @findex gnus-article-treat-overstrike Treat overstrike (@code{gnus-article-treat-overstrike}). @item W d @kindex W d (Summary) @findex gnus-article-treat-dumbquotes @vindex gnus-article-dumbquotes-map @cindex Smartquotes @cindex M****s*** sm*rtq**t*s @cindex Latin 1 Treat M****s*** sm*rtq**t*s according to @code{gnus-article-dumbquotes-map} (@code{gnus-article-treat-dumbquotes}). Note that this function guesses whether a character is a sm*rtq**t* or not, so it should only be used interactively. Sm*rtq**t*s are M****s***'s unilateral extension to the character map in an attempt to provide more quoting characters. If you see something like @code{\222} or @code{\264} where you're expecting some kind of apostrophe or quotation mark, then try this wash. @item W Y f @kindex W Y f (Summary) @findex gnus-article-outlook-deuglify-article @cindex Outlook Express Full deuglify of broken Outlook (Express) articles: Treat dumbquotes, unwrap lines, repair attribution and rearrange citation. (@code{gnus-article-outlook-deuglify-article}). @item W Y u @kindex W Y u (Summary) @findex gnus-article-outlook-unwrap-lines @vindex gnus-outlook-deuglify-unwrap-min @vindex gnus-outlook-deuglify-unwrap-max Unwrap lines that appear to be wrapped citation lines. You can control what lines will be unwrapped by frobbing @code{gnus-outlook-deuglify-unwrap-min} and @code{gnus-outlook-deuglify-unwrap-max}, indicating the minimum and maximum length of an unwrapped citation line. (@code{gnus-article-outlook-unwrap-lines}). @item W Y a @kindex W Y a (Summary) @findex gnus-article-outlook-repair-attribution Repair a broken attribution line.@* (@code{gnus-article-outlook-repair-attribution}). @item W Y c @kindex W Y c (Summary) @findex gnus-article-outlook-rearrange-citation Repair broken citations by rearranging the text. (@code{gnus-article-outlook-rearrange-citation}). @item W w @kindex W w (Summary) @findex gnus-article-fill-cited-article Do word wrap (@code{gnus-article-fill-cited-article}). You can give the command a numerical prefix to specify the width to use when filling. @item W Q @kindex W Q (Summary) @findex gnus-article-fill-long-lines Fill long lines (@code{gnus-article-fill-long-lines}). @item W C @kindex W C (Summary) @findex gnus-article-capitalize-sentences Capitalize the first word in each sentence (@code{gnus-article-capitalize-sentences}). @item W c @kindex W c (Summary) @findex gnus-article-remove-cr Translate CRLF pairs (i. e., @samp{^M}s on the end of the lines) into LF (this takes care of DOS line endings), and then translate any remaining CRs into LF (this takes care of Mac line endings) (@code{gnus-article-remove-cr}). @item W q @kindex W q (Summary) @findex gnus-article-de-quoted-unreadable Treat quoted-printable (@code{gnus-article-de-quoted-unreadable}). Quoted-Printable is one common @acronym{MIME} encoding employed when sending non-@acronym{ASCII} (i.e., 8-bit) articles. It typically makes strings like @samp{déjà vu} look like @samp{d=E9j=E0 vu}, which doesn't look very readable to me. Note that this is usually done automatically by Gnus if the message in question has a @code{Content-Transfer-Encoding} header that says that this encoding has been done. If a prefix is given, a charset will be asked for. @item W 6 @kindex W 6 (Summary) @findex gnus-article-de-base64-unreadable Treat base64 (@code{gnus-article-de-base64-unreadable}). Base64 is one common @acronym{MIME} encoding employed when sending non-@acronym{ASCII} (i.e., 8-bit) articles. Note that this is usually done automatically by Gnus if the message in question has a @code{Content-Transfer-Encoding} header that says that this encoding has been done. If a prefix is given, a charset will be asked for. @item W Z @kindex W Z (Summary) @findex gnus-article-decode-HZ Treat HZ or HZP (@code{gnus-article-decode-HZ}). HZ (or HZP) is one common encoding employed when sending Chinese articles. It typically makes strings look like @samp{~@{<:Ky2;S@{#,NpJ)l6HK!#~@}}. @item W u @kindex W u (Summary) @findex gnus-article-unsplit-urls Remove newlines from within URLs. Some mailers insert newlines into outgoing email messages to keep lines short. This reformatting can split long URLs onto multiple lines. Repair those URLs by removing the newlines (@code{gnus-article-unsplit-urls}). @item W h @kindex W h (Summary) @findex gnus-article-wash-html Treat @acronym{HTML} (@code{gnus-article-wash-html}). Note that this is usually done automatically by Gnus if the message in question has a @code{Content-Type} header that says that the message is @acronym{HTML}. If a prefix is given, a charset will be asked for. If it is a number, the charset defined in @code{gnus-summary-show-article-charset-alist} (@pxref{Paging the Article}) will be used. @vindex gnus-article-wash-function The default is to use the function specified by @code{mm-text-html-renderer} (@pxref{Display Customization, ,Display Customization, emacs-mime, The Emacs MIME Manual}) to convert the @acronym{HTML}, but this is controlled by the @code{gnus-article-wash-function} variable. Pre-defined functions you can use include: @table @code @item w3 Use Emacs/W3. @item w3m Use @uref{http://emacs-w3m.namazu.org/, emacs-w3m}. @item w3m-standalone Use @uref{http://w3m.sourceforge.net/, w3m}. @item links Use @uref{http://links.sf.net/, Links}. @item lynx Use @uref{http://lynx.isc.org/, Lynx}. @item html2text Use html2text---a simple @acronym{HTML} converter included with Gnus. @end table @item W b @kindex W b (Summary) @findex gnus-article-add-buttons Add clickable buttons to the article (@code{gnus-article-add-buttons}). @xref{Article Buttons}. @item W B @kindex W B (Summary) @findex gnus-article-add-buttons-to-head Add clickable buttons to the article headers (@code{gnus-article-add-buttons-to-head}). @item W p @kindex W p (Summary) @findex gnus-article-verify-x-pgp-sig Verify a signed control message (@code{gnus-article-verify-x-pgp-sig}). Control messages such as @code{newgroup} and @code{checkgroups} are usually signed by the hierarchy maintainer. You need to add the @acronym{PGP} public key of the maintainer to your keyring to verify the message.@footnote{@acronym{PGP} keys for many hierarchies are available at @uref{ftp://ftp.isc.org/pub/pgpcontrol/README.html}} @item W s @kindex W s (Summary) @findex gnus-summary-force-verify-and-decrypt Verify a signed (@acronym{PGP}, @acronym{PGP/MIME} or @acronym{S/MIME}) message (@code{gnus-summary-force-verify-and-decrypt}). @xref{Security}. @item W a @kindex W a (Summary) @findex gnus-article-strip-headers-in-body Strip headers like the @code{X-No-Archive} header from the beginning of article bodies (@code{gnus-article-strip-headers-in-body}). @item W E l @kindex W E l (Summary) @findex gnus-article-strip-leading-blank-lines Remove all blank lines from the beginning of the article (@code{gnus-article-strip-leading-blank-lines}). @item W E m @kindex W E m (Summary) @findex gnus-article-strip-multiple-blank-lines Replace all blank lines with empty lines and then all multiple empty lines with a single empty line. (@code{gnus-article-strip-multiple-blank-lines}). @item W E t @kindex W E t (Summary) @findex gnus-article-remove-trailing-blank-lines Remove all blank lines at the end of the article (@code{gnus-article-remove-trailing-blank-lines}). @item W E a @kindex W E a (Summary) @findex gnus-article-strip-blank-lines Do all the three commands above (@code{gnus-article-strip-blank-lines}). @item W E A @kindex W E A (Summary) @findex gnus-article-strip-all-blank-lines Remove all blank lines (@code{gnus-article-strip-all-blank-lines}). @item W E s @kindex W E s (Summary) @findex gnus-article-strip-leading-space Remove all white space from the beginning of all lines of the article body (@code{gnus-article-strip-leading-space}). @item W E e @kindex W E e (Summary) @findex gnus-article-strip-trailing-space Remove all white space from the end of all lines of the article body (@code{gnus-article-strip-trailing-space}). @end table @xref{Customizing Articles}, for how to wash articles automatically. @node Article Header @subsection Article Header These commands perform various transformations of article header. @table @kbd @item W G u @kindex W G u (Summary) @findex gnus-article-treat-unfold-headers Unfold folded header lines (@code{gnus-article-treat-unfold-headers}). @item W G n @kindex W G n (Summary) @findex gnus-article-treat-fold-newsgroups Fold the @code{Newsgroups} and @code{Followup-To} headers (@code{gnus-article-treat-fold-newsgroups}). @item W G f @kindex W G f (Summary) @findex gnus-article-treat-fold-headers Fold all the message headers (@code{gnus-article-treat-fold-headers}). @item W E w @kindex W E w (Summary) @findex gnus-article-remove-leading-whitespace Remove excessive whitespace from all headers (@code{gnus-article-remove-leading-whitespace}). @end table @node Article Buttons @subsection Article Buttons @cindex buttons People often include references to other stuff in articles, and it would be nice if Gnus could just fetch whatever it is that people talk about with the minimum of fuzz when you hit @kbd{RET} or use the middle mouse button on these references. @vindex gnus-button-man-handler Gnus adds @dfn{buttons} to certain standard references by default: Well-formed URLs, mail addresses, Message-IDs, Info links, man pages and Emacs or Gnus related references. This is controlled by two variables, one that handles article bodies and one that handles article heads: @table @code @item gnus-button-alist @vindex gnus-button-alist This is an alist where each entry has this form: @lisp (@var{regexp} @var{button-par} @var{use-p} @var{function} @var{data-par}) @end lisp @table @var @item regexp All text that match this regular expression (case insensitive) will be considered an external reference. Here's a typical regexp that matches embedded URLs: @samp{<URL:\$$[^\n\r>]*\$$>}. This can also be a variable containing a regexp, useful variables to use include @code{gnus-button-url-regexp} and @code{gnus-button-mid-or-mail-regexp}. @item button-par Gnus has to know which parts of the matches is to be highlighted. This is a number that says what sub-expression of the regexp is to be highlighted. If you want it all highlighted, you use 0 here. @item use-p This form will be @code{eval}ed, and if the result is non-@code{nil}, this is considered a match. This is useful if you want extra sifting to avoid false matches. Often variables named @code{gnus-button-@var{*}-level} are used here, @xref{Article Button Levels}, but any other form may be used too. @c @code{use-p} is @code{eval}ed only if @code{regexp} matches. @item function This function will be called when you click on this button. @item data-par As with @var{button-par}, this is a sub-expression number, but this one says which part of the match is to be sent as data to @var{function}. @end table So the full entry for buttonizing URLs is then @lisp ("<URL:\$$[^\n\r>]*\$$>" 0 t gnus-button-url 1) @end lisp @item gnus-header-button-alist @vindex gnus-header-button-alist This is just like the other alist, except that it is applied to the article head only, and that each entry has an additional element that is used to say what headers to apply the buttonize coding to: @lisp (@var{header} @var{regexp} @var{button-par} @var{use-p} @var{function} @var{data-par}) @end lisp @var{header} is a regular expression. @end table @subsubsection Related variables and functions @table @code @item gnus-button-@var{*}-level @xref{Article Button Levels}. @c Stuff related to gnus-button-browse-level @item gnus-button-url-regexp @vindex gnus-button-url-regexp A regular expression that matches embedded URLs. It is used in the default values of the variables above. @c Stuff related to gnus-button-man-level @item gnus-button-man-handler @vindex gnus-button-man-handler The function to use for displaying man pages. It must take at least one argument with a string naming the man page. @c Stuff related to gnus-button-message-level @item gnus-button-mid-or-mail-regexp @vindex gnus-button-mid-or-mail-regexp Regular expression that matches a message ID or a mail address. @item gnus-button-prefer-mid-or-mail @vindex gnus-button-prefer-mid-or-mail This variable determines what to do when the button on a string as @samp{foo123@@bar.invalid} is pushed. Strings like this can be either a message ID or a mail address. If it is one of the symbols @code{mid} or @code{mail}, Gnus will always assume that the string is a message ID or a mail address, respectively. If this variable is set to the symbol @code{ask}, always query the user what do do. If it is a function, this function will be called with the string as its only argument. The function must return @code{mid}, @code{mail}, @code{invalid} or @code{ask}. The default value is the function @code{gnus-button-mid-or-mail-heuristic}. @item gnus-button-mid-or-mail-heuristic @findex gnus-button-mid-or-mail-heuristic Function that guesses whether its argument is a message ID or a mail address. Returns @code{mid} if it's a message IDs, @code{mail} if it's a mail address, @code{ask} if unsure and @code{invalid} if the string is invalid. @item gnus-button-mid-or-mail-heuristic-alist @vindex gnus-button-mid-or-mail-heuristic-alist An alist of @code{(RATE . REGEXP)} pairs used by the function @code{gnus-button-mid-or-mail-heuristic}. @c Stuff related to gnus-button-tex-level @item gnus-button-ctan-handler @findex gnus-button-ctan-handler The function to use for displaying CTAN links. It must take one argument, the string naming the URL. @item gnus-ctan-url @vindex gnus-ctan-url Top directory of a CTAN (Comprehensive TeX Archive Network) archive used by @code{gnus-button-ctan-handler}. @c Misc stuff @item gnus-article-button-face @vindex gnus-article-button-face Face used on buttons. @item gnus-article-mouse-face @vindex gnus-article-mouse-face Face used when the mouse cursor is over a button. @end table @xref{Customizing Articles}, for how to buttonize articles automatically. @node Article Button Levels @subsection Article button levels @cindex button levels The higher the value of the variables @code{gnus-button-@var{*}-level}, the more buttons will appear. If the level is zero, no corresponding buttons are displayed. With the default value (which is 5) you should already see quite a lot of buttons. With higher levels, you will see more buttons, but you may also get more false positives. To avoid them, you can set the variables @code{gnus-button-@var{*}-level} local to specific groups (@pxref{Group Parameters}). Here's an example for the variable @code{gnus-parameters}: @lisp ;; @r{increase @code{gnus-button-*-level} in some groups:} (setq gnus-parameters '(("\\<\$$emacs\\|gnus\$$\\>" (gnus-button-emacs-level 10)) ("\\<unix\\>" (gnus-button-man-level 10)) ("\\<tex\\>" (gnus-button-tex-level 10)))) @end lisp @table @code @item gnus-button-browse-level @vindex gnus-button-browse-level Controls the display of references to message IDs, mail addresses and news URLs. Related variables and functions include @code{gnus-button-url-regexp}, @code{browse-url}, and @code{browse-url-browser-function}. @item gnus-button-emacs-level @vindex gnus-button-emacs-level Controls the display of Emacs or Gnus references. Related functions are @code{gnus-button-handle-custom}, @code{gnus-button-handle-describe-function}, @code{gnus-button-handle-describe-variable}, @code{gnus-button-handle-symbol}, @code{gnus-button-handle-describe-key}, @code{gnus-button-handle-apropos}, @code{gnus-button-handle-apropos-command}, @code{gnus-button-handle-apropos-variable}, @code{gnus-button-handle-apropos-documentation}, and @code{gnus-button-handle-library}. @item gnus-button-man-level @vindex gnus-button-man-level Controls the display of references to (Unix) man pages. See @code{gnus-button-man-handler}. @item gnus-button-message-level @vindex gnus-button-message-level Controls the display of message IDs, mail addresses and news URLs. Related variables and functions include @code{gnus-button-mid-or-mail-regexp}, @code{gnus-button-prefer-mid-or-mail}, @code{gnus-button-mid-or-mail-heuristic}, and @code{gnus-button-mid-or-mail-heuristic-alist}. @item gnus-button-tex-level @vindex gnus-button-tex-level Controls the display of references to @TeX{} or LaTeX stuff, e.g. for CTAN URLs. See the variables @code{gnus-ctan-url}, @code{gnus-button-ctan-handler}, @code{gnus-button-ctan-directory-regexp}, and @code{gnus-button-handle-ctan-bogus-regexp}. @end table @node Article Date @subsection Article Date The date is most likely generated in some obscure timezone you've never heard of, so it's quite nice to be able to find out what the time was when the article was sent. @table @kbd @item W T u @kindex W T u (Summary) @findex gnus-article-date-ut Display the date in UT (aka. GMT, aka ZULU) (@code{gnus-article-date-ut}). @item W T i @kindex W T i (Summary) @findex gnus-article-date-iso8601 @cindex ISO 8601 Display the date in international format, aka. ISO 8601 (@code{gnus-article-date-iso8601}). @item W T l @kindex W T l (Summary) @findex gnus-article-date-local Display the date in the local timezone (@code{gnus-article-date-local}). @item W T p @kindex W T p (Summary) @findex gnus-article-date-english Display the date in a format that's easily pronounceable in English (@code{gnus-article-date-english}). @item W T s @kindex W T s (Summary) @vindex gnus-article-time-format @findex gnus-article-date-user @findex format-time-string Display the date using a user-defined format (@code{gnus-article-date-user}). The format is specified by the @code{gnus-article-time-format} variable, and is a string that's passed to @code{format-time-string}. See the documentation of that variable for a list of possible format specs. @item W T e @kindex W T e (Summary) @findex gnus-article-date-lapsed @findex gnus-start-date-timer @findex gnus-stop-date-timer Say how much time has elapsed between the article was posted and now (@code{gnus-article-date-lapsed}). It looks something like: @example X-Sent: 6 weeks, 4 days, 1 hour, 3 minutes, 8 seconds ago @end example @vindex gnus-article-date-lapsed-new-header The value of @code{gnus-article-date-lapsed-new-header} determines whether this header will just be added below the old Date one, or will replace it. An advantage of using Gnus to read mail is that it converts simple bugs into wonderful absurdities. If you want to have this line updated continually, you can put @lisp (gnus-start-date-timer) @end lisp in your @file{~/.gnus.el} file, or you can run it off of some hook. If you want to stop the timer, you can use the @code{gnus-stop-date-timer} command. @item W T o @kindex W T o (Summary) @findex gnus-article-date-original Display the original date (@code{gnus-article-date-original}). This can be useful if you normally use some other conversion function and are worried that it might be doing something totally wrong. Say, claiming that the article was posted in 1854. Although something like that is @emph{totally} impossible. Don't you trust me? *titter* @end table @xref{Customizing Articles}, for how to display the date in your preferred format automatically. @node Article Display @subsection Article Display @cindex picons @cindex x-face @cindex smileys These commands add various frivolous display gimmicks to the article buffer in Emacs versions that support them. @code{X-Face} headers are small black-and-white images supplied by the message headers (@pxref{X-Face}). @code{Face} headers are small colored images supplied by the message headers (@pxref{Face}). Smileys are those little @samp{:-)} symbols that people like to litter their messages with (@pxref{Smileys}). Picons, on the other hand, reside on your own system, and Gnus will try to match the headers to what you have (@pxref{Picons}). All these functions are toggles---if the elements already exist, they'll be removed. @table @kbd @item W D x @kindex W D x (Summary) @findex gnus-article-display-x-face Display an @code{X-Face} in the @code{From} header. (@code{gnus-article-display-x-face}). @item W D d @kindex W D d (Summary) @findex gnus-article-display-face Display a @code{Face} in the @code{From} header. (@code{gnus-article-display-face}). @item W D s @kindex W D s (Summary) @findex gnus-treat-smiley Display smileys (@code{gnus-treat-smiley}). @item W D f @kindex W D f (Summary) @findex gnus-treat-from-picon Piconify the @code{From} header (@code{gnus-treat-from-picon}). @item W D m @kindex W D m (Summary) @findex gnus-treat-mail-picon Piconify all mail headers (i. e., @code{Cc}, @code{To}) (@code{gnus-treat-mail-picon}). @item W D n @kindex W D n (Summary) @findex gnus-treat-newsgroups-picon Piconify all news headers (i. e., @code{Newsgroups} and @code{Followup-To}) (@code{gnus-treat-newsgroups-picon}). @item W D D @kindex W D D (Summary) @findex gnus-article-remove-images Remove all images from the article buffer (@code{gnus-article-remove-images}). @end table @node Article Signature @subsection Article Signature @cindex signatures @cindex article signature @vindex gnus-signature-separator Each article is divided into two parts---the head and the body. The body can be divided into a signature part and a text part. The variable that says what is to be considered a signature is @code{gnus-signature-separator}. This is normally the standard @samp{^--$} as mandated by son-of-RFC 1036.  However, many people use
non-standard signature separators, so this variable can also be a list
of regular expressions to be tested, one by one.  (Searches are done
from the end of the body towards the beginning.)  One likely value is:

@lisp
(setq gnus-signature-separator
'("^-- $" ; @r{The standard} "^-- *$"        ; @r{A common mangling}
"^-------*$" ; @r{Many people just use a looong} ; @r{line of dashes. Shame!} "^ *--------*$" ; @r{Double-shame!}
"^________*$" ; @r{Underscores are also popular} "^========*$")) ; @r{Pervert!}
@end lisp

The more permissive you are, the more likely it is that you'll get false
positives.

@vindex gnus-signature-limit
@code{gnus-signature-limit} provides a limit to what is considered a
signature when displaying articles.

@enumerate
@item
If it is an integer, no signature may be longer (in characters) than
that integer.
@item
If it is a floating point number, no signature may be longer (in lines)
than that number.
@item
If it is a function, the function will be called without any parameters,
and if it returns @code{nil}, there is no signature in the buffer.
@item
If it is a string, it will be used as a regexp.  If it matches, the text
in question is not a signature.
@end enumerate

This variable can also be a list where the elements may be of the types
listed above.  Here's an example:

@lisp
(setq gnus-signature-limit
'(200.0 "^---*Forwarded article"))
@end lisp

This means that if there are more than 200 lines after the signature
separator, or the text after the signature separator is matched by
the regular expression @samp{^---*Forwarded article}, then it isn't a
signature after all.

@node Article Miscellanea
@subsection Article Miscellanea

@table @kbd
@item A t
@kindex A t (Summary)
@findex gnus-article-babel
Translate the article from one language to another
(@code{gnus-article-babel}).

@end table

@node MIME Commands
@section MIME Commands
@cindex MIME decoding
@cindex attachments
@cindex viewing attachments

The following commands all understand the numerical prefix.  For
instance, @kbd{3 b} means view the third @acronym{MIME} part''.

@table @kbd
@item b
@itemx K v
@kindex b (Summary)
@kindex K v (Summary)
View the @acronym{MIME} part.

@item K o
@kindex K o (Summary)
Save the @acronym{MIME} part.

@item K c
@kindex K c (Summary)
Copy the @acronym{MIME} part.

@item K e
@kindex K e (Summary)
View the @acronym{MIME} part externally.

@item K i
@kindex K i (Summary)
View the @acronym{MIME} part internally.

@item K |
@kindex K | (Summary)
Pipe the @acronym{MIME} part to an external command.
@end table

The rest of these @acronym{MIME} commands do not use the numerical prefix in
the same manner:

@table @kbd
@item K b
@kindex K b (Summary)
Make all the @acronym{MIME} parts have buttons in front of them.  This is
mostly useful if you wish to save (or perform other actions) on inlined
parts.

@item K m
@kindex K m (Summary)
@findex gnus-summary-repair-multipart
Some multipart messages are transmitted with missing or faulty headers.
This command will attempt to repair'' these messages so that they can
be viewed in a more pleasant manner
(@code{gnus-summary-repair-multipart}).

@item X m
@kindex X m (Summary)
@findex gnus-summary-save-parts
Save all parts matching a @acronym{MIME} type to a directory
(@code{gnus-summary-save-parts}).  Understands the process/prefix
convention (@pxref{Process/Prefix}).

@item M-t
@kindex M-t (Summary)
@findex gnus-summary-toggle-display-buttonized
Toggle the buttonized display of the article buffer
(@code{gnus-summary-toggle-display-buttonized}).

@item W M w
@kindex W M w (Summary)
@findex gnus-article-decode-mime-words
Decode RFC 2047-encoded words in the article headers
(@code{gnus-article-decode-mime-words}).

@item W M c
@kindex W M c (Summary)
@findex gnus-article-decode-charset
Decode encoded article bodies as well as charsets
(@code{gnus-article-decode-charset}).

This command looks in the @code{Content-Type} header to determine the
charset.  If there is no such header in the article, you can give it a
prefix, which will prompt for the charset to decode as.  In regional
groups where people post using some common encoding (but do not
include @acronym{MIME} headers), you can set the @code{charset} group/topic
parameter to the required charset (@pxref{Group Parameters}).

@item W M v
@kindex W M v (Summary)
@findex gnus-mime-view-all-parts
View all the @acronym{MIME} parts in the current article
(@code{gnus-mime-view-all-parts}).

@end table

Relevant variables:

@table @code
@item gnus-ignored-mime-types
@vindex gnus-ignored-mime-types
This is a list of regexps.  @acronym{MIME} types that match a regexp from
this list will be completely ignored by Gnus.  The default value is
@code{nil}.

To have all Vcards be ignored, you'd say something like this:

@lisp
(setq gnus-ignored-mime-types
'("text/x-vcard"))
@end lisp

@item gnus-article-loose-mime
@vindex gnus-article-loose-mime
If non-@code{nil}, Gnus won't require the @samp{MIME-Version} header
before interpreting the message as a @acronym{MIME} message.  This helps
when reading messages from certain broken mail user agents.  The
default is @code{nil}.

@item gnus-article-emulate-mime
@vindex gnus-article-emulate-mime
@cindex uuencode
@cindex yEnc
There are other, non-@acronym{MIME} encoding methods used.  The most common
is @samp{uuencode}, but yEncode is also getting to be popular.  If
this variable is non-@code{nil}, Gnus will look in message bodies to
see if it finds these encodings, and if so, it'll run them through the
Gnus @acronym{MIME} machinery.  The default is @code{t}.  Only
single-part yEnc encoded attachments can be decoded.  There's no support
for encoding in Gnus.

@item gnus-unbuttonized-mime-types
@vindex gnus-unbuttonized-mime-types
This is a list of regexps.  @acronym{MIME} types that match a regexp from
this list won't have @acronym{MIME} buttons inserted unless they aren't
displayed or this variable is overridden by
@code{gnus-buttonized-mime-types}.  The default value is
@code{(".*/.*")}.  This variable is only used when
@code{gnus-inhibit-mime-unbuttonizing} is @code{nil}.

@item gnus-buttonized-mime-types
@vindex gnus-buttonized-mime-types
This is a list of regexps.  @acronym{MIME} types that match a regexp from
this list will have @acronym{MIME} buttons inserted unless they aren't
displayed.  This variable overrides
@code{gnus-unbuttonized-mime-types}.  The default value is @code{nil}.
This variable is only used when @code{gnus-inhibit-mime-unbuttonizing}
is @code{nil}.

To see e.g. security buttons but no other buttons, you could set this
variable to @code{("multipart/signed")} and leave
@code{gnus-unbuttonized-mime-types} at the default value.

You could also add @code{"multipart/alternative"} to this list to
display radio buttons that allow you to choose one of two media types
(@pxref{Display Customization, ,Display Customization, emacs-mime, The
Emacs MIME Manual}).

@item gnus-inhibit-mime-unbuttonizing
@vindex gnus-inhibit-mime-unbuttonizing
If this is non-@code{nil}, then all @acronym{MIME} parts get buttons.  The
default value is @code{nil}.

@item gnus-article-mime-part-function
@vindex gnus-article-mime-part-function
For each @acronym{MIME} part, this function will be called with the @acronym{MIME}
handle as the parameter.  The function is meant to be used to allow
users to gather information from the article (e. g., add Vcard info to
the bbdb database) or to do actions based on parts (e. g., automatically
save all jpegs into some directory).

Here's an example function the does the latter:

@lisp
(defun my-save-all-jpeg-parts (handle)
(when (equal (car (mm-handle-type handle)) "image/jpeg")
(with-temp-buffer
(insert (mm-get-part handle))
(write-region (point-min) (point-max)
(setq gnus-article-mime-part-function
'my-save-all-jpeg-parts)
@end lisp

@vindex gnus-mime-multipart-functions
@item gnus-mime-multipart-functions
Alist of @acronym{MIME} multipart types and functions to handle them.

@vindex gnus-mime-display-multipart-alternative-as-mixed
@item gnus-mime-display-multipart-alternative-as-mixed
Display "multipart/alternative" parts as "multipart/mixed".

@vindex gnus-mime-display-multipart-related-as-mixed
@item gnus-mime-display-multipart-related-as-mixed
Display "multipart/related" parts as "multipart/mixed".

If displaying "text/html" is discouraged, see
@code{mm-discouraged-alternatives}, images or other material inside a
"multipart/related" part might be overlooked when this variable is
@code{nil}.  @ref{Display Customization, Display Customization, ,
emacs-mime, Emacs-Mime Manual}.

@vindex gnus-mime-display-multipart-as-mixed
@item gnus-mime-display-multipart-as-mixed
Display "multipart" parts as "multipart/mixed".  If @code{t}, it
overrides @code{nil} values of
@code{gnus-mime-display-multipart-alternative-as-mixed} and
@code{gnus-mime-display-multipart-related-as-mixed}.

@vindex mm-file-name-rewrite-functions
@item mm-file-name-rewrite-functions
List of functions used for rewriting file names of @acronym{MIME} parts.
Each function takes a file name as input and returns a file name.

@code{mm-file-name-delete-whitespace},
@code{mm-file-name-trim-whitespace},
@code{mm-file-name-collapse-whitespace}, and
@code{mm-file-name-replace-whitespace}.  The later uses the value of
the variable @code{mm-file-name-replace-whitespace} to replace each
whitespace character in a file name with that string; default value
is @code{"_"} (a single underscore).
@findex mm-file-name-delete-whitespace
@findex mm-file-name-trim-whitespace
@findex mm-file-name-collapse-whitespace
@findex mm-file-name-replace-whitespace
@vindex mm-file-name-replace-whitespace

The standard functions @code{capitalize}, @code{downcase},
@code{upcase}, and @code{upcase-initials} may be useful, too.

Everybody knows that whitespace characters in file names are evil,
except those who don't know.  If you receive lots of attachments from
such unenlightened users, you can make live easier by adding

@lisp
(setq mm-file-name-rewrite-functions
'(mm-file-name-trim-whitespace
mm-file-name-collapse-whitespace
mm-file-name-replace-whitespace))
@end lisp

@noindent

@end table

@node Charsets
@section Charsets
@cindex charsets

People use different charsets, and we have @acronym{MIME} to let us know what
charsets they use.  Or rather, we wish we had.  Many people use
newsreaders and mailers that do not understand or use @acronym{MIME}, and
just send out messages without saying what character sets they use.  To
help a bit with this, some local news hierarchies have policies that say
what character set is the default.  For instance, the @samp{fj}
hierarchy uses @code{iso-2022-jp}.

@vindex gnus-group-charset-alist
This knowledge is encoded in the @code{gnus-group-charset-alist}
variable, which is an alist of regexps (use the first item to match full
group names) and default charsets to be used when reading these groups.

@vindex gnus-newsgroup-ignored-charsets
In addition, some people do use soi-disant @acronym{MIME}-aware agents that
aren't.  These blithely mark messages as being in @code{iso-8859-1}
even if they really are in @code{koi-8}.  To help here, the
@code{gnus-newsgroup-ignored-charsets} variable can be used.  The
charsets that are listed here will be ignored.  The variable can be
set on a group-by-group basis using the group parameters (@pxref{Group
Parameters}).  The default value is @code{(unknown-8bit x-unknown)},
which includes values some agents insist on having in there.

@vindex gnus-group-posting-charset-alist
When posting, @code{gnus-group-posting-charset-alist} is used to
determine which charsets should not be encoded using the @acronym{MIME}
encodings.  For instance, some hierarchies discourage using

This variable is an alist of regexps and permitted unencoded charsets
for posting.  Each element of the alist has the form @code{(}@var{test

@table @var
@item test
is either a regular expression matching the newsgroup header or a
variable to query,
is the charset which may be left unencoded in the header (@code{nil}
means encode all charsets),
@item body-list
is a list of charsets which may be encoded using 8bit content-transfer
encoding in the body, or one of the special values @code{nil} (always
encode using quoted-printable) or @code{t} (always use 8bit).
@end table

@cindex Russian
@cindex koi8-r
@cindex koi8-u
@cindex iso-8859-5
@cindex coding system aliases
@cindex preferred charset

@xref{Encoding Customization, , Encoding Customization, emacs-mime,
The Emacs MIME Manual}, for additional variables that control which
MIME charsets are used when sending messages.

Other charset tricks that may be useful, although not Gnus-specific:

If there are several @acronym{MIME} charsets that encode the same Emacs
charset, you can choose what charset to use by saying the following:

@lisp
(put-charset-property 'cyrillic-iso8859-5
'preferred-coding-system 'koi8-r)
@end lisp

This means that Russian will be encoded using @code{koi8-r} instead of
the default @code{iso-8859-5} @acronym{MIME} charset.

If you want to read messages in @code{koi8-u}, you can cheat and say

@lisp
(define-coding-system-alias 'koi8-u 'koi8-r)
@end lisp

This will almost do the right thing.

And finally, to read charsets like @code{windows-1251}, you can say
something like

@lisp
(codepage-setup 1251)
(define-coding-system-alias 'windows-1251 'cp1251)
@end lisp

@node Article Commands
@section Article Commands

@table @kbd

@item A P
@cindex PostScript
@cindex printing
@kindex A P (Summary)
@vindex gnus-ps-print-hook
@findex gnus-summary-print-article
Generate and print a PostScript image of the article buffer
(@code{gnus-summary-print-article}).  @code{gnus-ps-print-hook} will
be run just before printing the buffer.  An alternative way to print
article is to use Muttprint (@pxref{Saving Articles}).

@end table

@node Summary Sorting
@section Summary Sorting
@cindex summary sorting

You can have the summary buffer sorted in various ways, even though I
can't really see why you'd want that.

@table @kbd

@item C-c C-s C-n
@kindex C-c C-s C-n (Summary)
@findex gnus-summary-sort-by-number
Sort by article number (@code{gnus-summary-sort-by-number}).

@item C-c C-s C-a
@kindex C-c C-s C-a (Summary)
@findex gnus-summary-sort-by-author
Sort by author (@code{gnus-summary-sort-by-author}).

@item C-c C-s C-s
@kindex C-c C-s C-s (Summary)
@findex gnus-summary-sort-by-subject
Sort by subject (@code{gnus-summary-sort-by-subject}).

@item C-c C-s C-d
@kindex C-c C-s C-d (Summary)
@findex gnus-summary-sort-by-date
Sort by date (@code{gnus-summary-sort-by-date}).

@item C-c C-s C-l
@kindex C-c C-s C-l (Summary)
@findex gnus-summary-sort-by-lines
Sort by lines (@code{gnus-summary-sort-by-lines}).

@item C-c C-s C-c
@kindex C-c C-s C-c (Summary)
@findex gnus-summary-sort-by-chars
Sort by article length (@code{gnus-summary-sort-by-chars}).

@item C-c C-s C-i
@kindex C-c C-s C-i (Summary)
@findex gnus-summary-sort-by-score
Sort by score (@code{gnus-summary-sort-by-score}).

@item C-c C-s C-r
@kindex C-c C-s C-r (Summary)
@findex gnus-summary-sort-by-random
Randomize (@code{gnus-summary-sort-by-random}).

@item C-c C-s C-o
@kindex C-c C-s C-o (Summary)
@findex gnus-summary-sort-by-original
Sort using the default sorting method
(@code{gnus-summary-sort-by-original}).
@end table

These functions will work both when you use threading and when you don't
use threading.  In the latter case, all summary lines will be sorted,
line by line.  In the former case, sorting will be done on a
root-by-root basis, which might not be what you were looking for.  To
Commands}).

@node Finding the Parent
@section Finding the Parent
@cindex parent articles
@cindex referring articles

@table @kbd
@item ^
@kindex ^ (Summary)
@findex gnus-summary-refer-parent-article
If you'd like to read the parent of the current article, and it is not
displayed in the summary buffer, you might still be able to.  That is,
if the current group is fetched by @acronym{NNTP}, the parent hasn't expired
and the @code{References} in the current article are not mangled, you
can just press @kbd{^} or @kbd{A r}
(@code{gnus-summary-refer-parent-article}).  If everything goes well,
you'll get the parent.  If the parent is already displayed in the

If given a positive numerical prefix, fetch that many articles back into
the ancestry.  If given a negative numerical prefix, fetch just that
ancestor.  So if you say @kbd{3 ^}, Gnus will fetch the parent, the
grandparent and the grandgrandparent of the current article.  If you say
@kbd{-3 ^}, Gnus will only fetch the grandgrandparent of the current
article.

@item A R (Summary)
@findex gnus-summary-refer-references
@kindex A R (Summary)
Fetch all articles mentioned in the @code{References} header of the
article (@code{gnus-summary-refer-references}).

@item A T (Summary)
@kindex A T (Summary)
Display the full thread where the current article appears
(@code{gnus-summary-refer-thread}).  This command has to fetch all the
headers in the current group to work, so it usually takes a while.  If
you do it often, you may consider setting @code{gnus-fetch-old-headers}
to @code{invisible} (@pxref{Filling In Threads}).  This won't have any
visible effects normally, but it'll make this command work a whole lot
faster.  Of course, it'll make group entry somewhat slow.

The @code{gnus-refer-thread-limit} variable says how many old (i. e.,
articles before the first displayed in the current group) headers to
fetch when doing this command.  The default is 200.  If @code{t}, all
the available headers will be fetched.  This variable can be overridden
by giving the @kbd{A T} command a numerical prefix.

@item M-^ (Summary)
@findex gnus-summary-refer-article
@kindex M-^ (Summary)
@cindex Message-ID
@cindex fetching by Message-ID
You can also ask Gnus for an arbitrary article, no matter what group it
belongs to.  @kbd{M-^} (@code{gnus-summary-refer-article}) will ask you
for a @code{Message-ID}, which is one of those long, hard-to-read
thingies that look something like @samp{<38o6up$6f2@@hymir.ifi.uio.no>}. You have to get it all exactly right. No fuzzy searches, I'm afraid. Gnus looks for the @code{Message-ID} in the headers that have already been fetched, but also tries all the select methods specified by @code{gnus-refer-article-method} if it is not found. @end table @vindex gnus-refer-article-method If the group you are reading is located on a back end that does not support fetching by @code{Message-ID} very well (like @code{nnspool}), you can set @code{gnus-refer-article-method} to an @acronym{NNTP} method. It would, perhaps, be best if the @acronym{NNTP} server you consult is the one updating the spool you are reading from, but that's not really necessary. It can also be a list of select methods, as well as the special symbol @code{current}, which means to use the current select method. If it is a list, Gnus will try all the methods in the list until it finds a match. Here's an example setting that will first try the current method, and then ask Google if that fails: @lisp (setq gnus-refer-article-method '(current (nnweb "google" (nnweb-type google)))) @end lisp Most of the mail back ends support fetching by @code{Message-ID}, but do not do a particularly excellent job at it. That is, @code{nnmbox}, @code{nnbabyl}, @code{nnmaildir}, @code{nnml}, are able to locate articles from any groups, while @code{nnfolder}, and @code{nnimap} are only able to locate articles that have been posted to the current group. (Anything else would be too time consuming.) @code{nnmh} does not support this at all. @node Alternative Approaches @section Alternative Approaches Different people like to read news using different methods. This being Gnus, we offer a small selection of minor modes for the summary buffers. @menu * Pick and Read:: First mark articles and then read them. * Binary Groups:: Auto-decode all articles. @end menu @node Pick and Read @subsection Pick and Read @cindex pick and read Some newsreaders (like @code{nn} and, uhm, @code{Netnews} on VM/CMS) use a two-phased reading interface. The user first marks in a summary buffer the articles she wants to read. Then she starts reading the articles with just an article buffer displayed. @findex gnus-pick-mode @kindex M-x gnus-pick-mode Gnus provides a summary buffer minor mode that allows this---@code{gnus-pick-mode}. This basically means that a few process mark commands become one-keystroke commands to allow easy marking, and it provides one additional command for switching to the summary buffer. Here are the available keystrokes when using pick mode: @table @kbd @item . @kindex . (Pick) @findex gnus-pick-article-or-thread Pick the article or thread on the current line (@code{gnus-pick-article-or-thread}). If the variable @code{gnus-thread-hide-subtree} is true, then this key selects the entire thread when used at the first article of the thread. Otherwise, it selects just the article. If given a numerical prefix, go to that thread or article and pick it. (The line number is normally displayed at the beginning of the summary pick lines.) @item SPACE @kindex SPACE (Pick) @findex gnus-pick-next-page Scroll the summary buffer up one page (@code{gnus-pick-next-page}). If at the end of the buffer, start reading the picked articles. @item u @kindex u (Pick) @findex gnus-pick-unmark-article-or-thread. Unpick the thread or article (@code{gnus-pick-unmark-article-or-thread}). If the variable @code{gnus-thread-hide-subtree} is true, then this key unpicks the thread if used at the first article of the thread. Otherwise it unpicks just the article. You can give this key a numerical prefix to unpick the thread or article at that line. @item RET @kindex RET (Pick) @findex gnus-pick-start-reading @vindex gnus-pick-display-summary Start reading the picked articles (@code{gnus-pick-start-reading}). If given a prefix, mark all unpicked articles as read first. If @code{gnus-pick-display-summary} is non-@code{nil}, the summary buffer will still be visible when you are reading. @end table All the normal summary mode commands are still available in the pick-mode, with the exception of @kbd{u}. However @kbd{!} is available which is mapped to the same function @code{gnus-summary-tick-article-forward}. If this sounds like a good idea to you, you could say: @lisp (add-hook 'gnus-summary-mode-hook 'gnus-pick-mode) @end lisp @vindex gnus-pick-mode-hook @code{gnus-pick-mode-hook} is run in pick minor mode buffers. @vindex gnus-mark-unpicked-articles-as-read If @code{gnus-mark-unpicked-articles-as-read} is non-@code{nil}, mark all unpicked articles as read. The default is @code{nil}. @vindex gnus-summary-pick-line-format The summary line format in pick mode is slightly different from the standard format. At the beginning of each line the line number is displayed. The pick mode line format is controlled by the @code{gnus-summary-pick-line-format} variable (@pxref{Formatting Variables}). It accepts the same format specs that @code{gnus-summary-line-format} does (@pxref{Summary Buffer Lines}). @node Binary Groups @subsection Binary Groups @cindex binary groups @findex gnus-binary-mode @kindex M-x gnus-binary-mode If you spend much time in binary groups, you may grow tired of hitting @kbd{X u}, @kbd{n}, @kbd{RET} all the time. @kbd{M-x gnus-binary-mode} is a minor mode for summary buffers that makes all ordinary Gnus article selection functions uudecode series of articles and display the result instead of just displaying the articles the normal way. @kindex g (Binary) @findex gnus-binary-show-article The only way, in fact, to see the actual articles is the @kbd{g} command, when you have turned on this mode (@code{gnus-binary-show-article}). @vindex gnus-binary-mode-hook @code{gnus-binary-mode-hook} is called in binary minor mode buffers. @node Tree Display @section Tree Display @cindex trees @vindex gnus-use-trees If you don't like the normal Gnus summary display, you might try setting @code{gnus-use-trees} to @code{t}. This will create (by default) an additional @dfn{tree buffer}. You can execute all summary mode commands in the tree buffer. There are a few variables to customize the tree display, of course: @table @code @item gnus-tree-mode-hook @vindex gnus-tree-mode-hook A hook called in all tree mode buffers. @item gnus-tree-mode-line-format @vindex gnus-tree-mode-line-format A format string for the mode bar in the tree mode buffers (@pxref{Mode Line Formatting}). The default is @samp{Gnus: %%b %S %Z}. For a list of valid specs, @pxref{Summary Buffer Mode Line}. @item gnus-selected-tree-face @vindex gnus-selected-tree-face Face used for highlighting the selected article in the tree buffer. The default is @code{modeline}. @item gnus-tree-line-format @vindex gnus-tree-line-format A format string for the tree nodes. The name is a bit of a misnomer, though---it doesn't define a line, but just the node. The default value is @samp{%(%[%3,3n%]%)}, which displays the first three characters of the name of the poster. It is vital that all nodes are of the same length, so you @emph{must} use @samp{%4,4n}-like specifiers. Valid specs are: @table @samp @item n The name of the poster. @item f The @code{From} header. @item N The number of the article. @item [ The opening bracket. @item ] The closing bracket. @item s The subject. @end table @xref{Formatting Variables}. Variables related to the display are: @table @code @item gnus-tree-brackets @vindex gnus-tree-brackets This is used for differentiating between real'' articles and sparse'' articles. The format is @example ((@var{real-open} . @var{real-close}) (@var{sparse-open} . @var{sparse-close}) (@var{dummy-open} . @var{dummy-close})) @end example and the default is @code{((?[ . ?]) (?( . ?)) (?@{ . ?@}) (?< . ?>))}. @item gnus-tree-parent-child-edges @vindex gnus-tree-parent-child-edges This is a list that contains the characters used for connecting parent nodes to their children. The default is @code{(?- ?\\ ?|)}. @end table @item gnus-tree-minimize-window @vindex gnus-tree-minimize-window If this variable is non-@code{nil}, Gnus will try to keep the tree buffer as small as possible to allow more room for the other Gnus windows. If this variable is a number, the tree buffer will never be higher than that number. The default is @code{t}. Note that if you have several windows displayed side-by-side in a frame and the tree buffer is one of these, minimizing the tree window will also resize all other windows displayed next to it. You may also wish to add the following hook to keep the window minimized at all times: @lisp (add-hook 'gnus-configure-windows-hook 'gnus-tree-perhaps-minimize) @end lisp @item gnus-generate-tree-function @vindex gnus-generate-tree-function @findex gnus-generate-horizontal-tree @findex gnus-generate-vertical-tree The function that actually generates the thread tree. Two predefined functions are available: @code{gnus-generate-horizontal-tree} and @code{gnus-generate-vertical-tree} (which is the default). @end table Here's an example from a horizontal tree buffer: @example @{***@}-(***)-[odd]-[Gun] | \[Jan] | \[odd]-[Eri] | $$***)-[Eri] | \[odd]-[Paa] \[Bjo] \[Gun] \[Gun]-[Jor] @end example Here's the same thread displayed in a vertical tree buffer: @example @group @{***@} |--------------------------\-----\-----\ (***) [Bjo] [Gun] [Gun] |--\-----\-----\ | [odd] [Jan] [odd] (***) [Jor] | | |--\ [Gun] [Eri] [Eri] [odd] | [Paa] @end group @end example If you're using horizontal trees, it might be nice to display the trees side-by-side with the summary buffer. You could add something like the following to your @file{~/.gnus.el} file: @lisp (setq gnus-use-trees t gnus-generate-tree-function 'gnus-generate-horizontal-tree gnus-tree-minimize-window nil) (gnus-add-configuration '(article (vertical 1.0 (horizontal 0.25 (summary 0.75 point) (tree 1.0)) (article 1.0)))) @end lisp @xref{Window Layout}. @node Mail Group Commands @section Mail Group Commands @cindex mail group commands Some commands only make sense in mail groups. If these commands are invalid in the current group, they will raise a hell and let you know. All these commands (except the expiry and edit commands) use the process/prefix convention (@pxref{Process/Prefix}). @table @kbd @item B e @kindex B e (Summary) @findex gnus-summary-expire-articles @cindex expiring mail Run all expirable articles in the current group through the expiry process (@code{gnus-summary-expire-articles}). That is, delete all expirable articles in the group that have been around for a while. (@pxref{Expiring Mail}). @item B C-M-e @kindex B C-M-e (Summary) @findex gnus-summary-expire-articles-now @cindex expiring mail Delete all the expirable articles in the group (@code{gnus-summary-expire-articles-now}). This means that @strong{all} articles eligible for expiry in the current group will disappear forever into that big @file{/dev/null} in the sky. @item B DEL @kindex B DEL (Summary) @findex gnus-summary-delete-article @c @icon{gnus-summary-mail-delete} Delete the mail article. This is delete'' as in delete it from your disk forever and ever, never to return again.'' Use with caution. (@code{gnus-summary-delete-article}). @item B m @kindex B m (Summary) @cindex move mail @findex gnus-summary-move-article @vindex gnus-preserve-marks Move the article from one mail group to another (@code{gnus-summary-move-article}). Marks will be preserved if @code{gnus-preserve-marks} is non-@code{nil} (which is the default). @item B c @kindex B c (Summary) @cindex copy mail @findex gnus-summary-copy-article @c @icon{gnus-summary-mail-copy} Copy the article from one group (mail group or not) to a mail group (@code{gnus-summary-copy-article}). Marks will be preserved if @code{gnus-preserve-marks} is non-@code{nil} (which is the default). @item B B @kindex B B (Summary) @cindex crosspost mail @findex gnus-summary-crosspost-article Crosspost the current article to some other group (@code{gnus-summary-crosspost-article}). This will create a new copy of the article in the other group, and the Xref headers of the article will be properly updated. @item B i @kindex B i (Summary) @findex gnus-summary-import-article Import an arbitrary file into the current mail newsgroup (@code{gnus-summary-import-article}). You will be prompted for a file name, a @code{From} header and a @code{Subject} header. @item B I @kindex B I (Summary) @findex gnus-summary-create-article Create an empty article in the current mail newsgroups (@code{gnus-summary-create-article}). You will be prompted for a @code{From} header and a @code{Subject} header. @item B r @kindex B r (Summary) @findex gnus-summary-respool-article @vindex gnus-summary-respool-default-method Respool the mail article (@code{gnus-summary-respool-article}). @code{gnus-summary-respool-default-method} will be used as the default select method when respooling. This variable is @code{nil} by default, which means that the current group select method will be used instead. Marks will be preserved if @code{gnus-preserve-marks} is non-@code{nil} (which is the default). @item B w @itemx e @kindex B w (Summary) @kindex e (Summary) @findex gnus-summary-edit-article @kindex C-c C-c (Article) @findex gnus-summary-edit-article-done Edit the current article (@code{gnus-summary-edit-article}). To finish editing and make the changes permanent, type @kbd{C-c C-c} (@code{gnus-summary-edit-article-done}). If you give a prefix to the @kbd{C-c C-c} command, Gnus won't re-highlight the article. @item B q @kindex B q (Summary) @findex gnus-summary-respool-query If you want to re-spool an article, you might be curious as to what group the article will end up in before you do the re-spooling. This command will tell you (@code{gnus-summary-respool-query}). @item B t @kindex B t (Summary) @findex gnus-summary-respool-trace Similarly, this command will display all fancy splitting patterns used when respooling, if any (@code{gnus-summary-respool-trace}). @item B p @kindex B p (Summary) @findex gnus-summary-article-posted-p Some people have a tendency to send you courtesy'' copies when they follow up to articles you have posted. These usually have a @code{Newsgroups} header in them, but not always. This command (@code{gnus-summary-article-posted-p}) will try to fetch the current article from your news server (or rather, from @code{gnus-refer-article-method} or @code{gnus-select-method}) and will report back whether it found the article or not. Even if it says that it didn't find the article, it may have been posted anyway---mail propagation is much faster than news propagation, and the news copy may just not have arrived yet. @item K E @kindex K E (Summary) @findex gnus-article-encrypt-body @vindex gnus-article-encrypt-protocol Encrypt the body of an article (@code{gnus-article-encrypt-body}). The body is encrypted with the encryption protocol specified by the variable @code{gnus-article-encrypt-protocol}. @end table @vindex gnus-move-split-methods @cindex moving articles If you move (or copy) articles regularly, you might wish to have Gnus suggest where to put the articles. @code{gnus-move-split-methods} is a variable that uses the same syntax as @code{gnus-split-methods} (@pxref{Saving Articles}). You may customize that variable to create suggestions you find reasonable. (Note that @code{gnus-move-split-methods} uses group names where @code{gnus-split-methods} uses file names.) @lisp (setq gnus-move-split-methods '(("^From:.*Lars Magne" "nnml:junk") ("^Subject:.*gnus" "nnfolder:important") (".*" "nnml:misc"))) @end lisp @node Various Summary Stuff @section Various Summary Stuff @menu * Summary Group Information:: Information oriented commands. * Searching for Articles:: Multiple article commands. * Summary Generation Commands:: * Really Various Summary Commands:: Those pesky non-conformant commands. @end menu @table @code @vindex gnus-summary-display-while-building @item gnus-summary-display-while-building If non-@code{nil}, show and update the summary buffer as it's being built. If @code{t}, update the buffer after every line is inserted. If the value is an integer, @var{n}, update the display every @var{n} lines. The default is @code{nil}. @vindex gnus-summary-display-arrow @item gnus-summary-display-arrow If non-@code{nil}, display an arrow in the fringe to indicate the current article. @vindex gnus-summary-mode-hook @item gnus-summary-mode-hook This hook is called when creating a summary mode buffer. @vindex gnus-summary-generate-hook @item gnus-summary-generate-hook This is called as the last thing before doing the threading and the generation of the summary buffer. It's quite convenient for customizing the threading variables based on what data the newsgroup has. This hook is called from the summary buffer after most summary buffer variables have been set. @vindex gnus-summary-prepare-hook @item gnus-summary-prepare-hook It is called after the summary buffer has been generated. You might use it to, for instance, highlight lines or modify the look of the buffer in some other ungodly manner. I don't care. @vindex gnus-summary-prepared-hook @item gnus-summary-prepared-hook A hook called as the very last thing after the summary buffer has been generated. @vindex gnus-summary-ignore-duplicates @item gnus-summary-ignore-duplicates When Gnus discovers two articles that have the same @code{Message-ID}, it has to do something drastic. No articles are allowed to have the same @code{Message-ID}, but this may happen when reading mail from some sources. Gnus allows you to customize what happens with this variable. If it is @code{nil} (which is the default), Gnus will rename the @code{Message-ID} (for display purposes only) and display the article as any other article. If this variable is @code{t}, it won't display the article---it'll be as if it never existed. @vindex gnus-alter-articles-to-read-function @item gnus-alter-articles-to-read-function This function, which takes two parameters (the group name and the list of articles to be selected), is called to allow the user to alter the list of articles to be selected. For instance, the following function adds the list of cached articles to the list in one particular group: @lisp (defun my-add-cached-articles (group articles) (if (string= group "some.group") (append gnus-newsgroup-cached articles) articles)) @end lisp @vindex gnus-newsgroup-variables @item gnus-newsgroup-variables A list of newsgroup (summary buffer) local variables, or cons of variables and their default expressions to be evalled (when the default values are not @code{nil}), that should be made global while the summary buffer is active. Note: The default expressions will be evaluated (using function @code{eval}) before assignment to the local variable rather than just assigned to it. If the default expression is the symbol @code{global}, that symbol will not be evaluated but the global value of the local variable will be used instead. These variables can be used to set variables in the group parameters while still allowing them to affect operations done in other buffers. For example: @lisp (setq gnus-newsgroup-variables '(message-use-followup-to (gnus-visible-headers . "^From:\\|^Newsgroups:\\|^Subject:\\|^Date:\\|^To:"))) @end lisp Also @pxref{Group Parameters}. @end table @node Summary Group Information @subsection Summary Group Information @table @kbd @item H f @kindex H f (Summary) @findex gnus-summary-fetch-faq @vindex gnus-group-faq-directory Try to fetch the @acronym{FAQ} (list of frequently asked questions) for the current group (@code{gnus-summary-fetch-faq}). Gnus will try to get the @acronym{FAQ} from @code{gnus-group-faq-directory}, which is usually a directory on a remote machine. This variable can also be a list of directories. In that case, giving a prefix to this command will allow you to choose between the various sites. @code{ange-ftp} or @code{efs} will probably be used for fetching the file. @item H d @kindex H d (Summary) @findex gnus-summary-describe-group Give a brief description of the current group (@code{gnus-summary-describe-group}). If given a prefix, force rereading the description from the server. @item H h @kindex H h (Summary) @findex gnus-summary-describe-briefly Give an extremely brief description of the most important summary keystrokes (@code{gnus-summary-describe-briefly}). @item H i @kindex H i (Summary) @findex gnus-info-find-node Go to the Gnus info node (@code{gnus-info-find-node}). @end table @node Searching for Articles @subsection Searching for Articles @table @kbd @item M-s @kindex M-s (Summary) @findex gnus-summary-search-article-forward Search through all subsequent (raw) articles for a regexp (@code{gnus-summary-search-article-forward}). @item M-r @kindex M-r (Summary) @findex gnus-summary-search-article-backward Search through all previous (raw) articles for a regexp (@code{gnus-summary-search-article-backward}). @item & @kindex & (Summary) @findex gnus-summary-execute-command This command will prompt you for a header, a regular expression to match on this field, and a command to be executed if the match is made (@code{gnus-summary-execute-command}). If the header is an empty string, the match is done on the entire article. If given a prefix, search backward instead. For instance, @kbd{& RET some.*string RET #} will put the process mark on all articles that have heads or bodies that match @samp{some.*string}. @item M-& @kindex M-& (Summary) @findex gnus-summary-universal-argument Perform any operation on all articles that have been marked with the process mark (@code{gnus-summary-universal-argument}). @end table @node Summary Generation Commands @subsection Summary Generation Commands @table @kbd @item Y g @kindex Y g (Summary) @findex gnus-summary-prepare Regenerate the current summary buffer (@code{gnus-summary-prepare}). @item Y c @kindex Y c (Summary) @findex gnus-summary-insert-cached-articles Pull all cached articles (for the current group) into the summary buffer (@code{gnus-summary-insert-cached-articles}). @item Y d @kindex Y d (Summary) @findex gnus-summary-insert-dormant-articles Pull all dormant articles (for the current group) into the summary buffer (@code{gnus-summary-insert-dormant-articles}). @end table @node Really Various Summary Commands @subsection Really Various Summary Commands @table @kbd @item A D @itemx C-d @kindex C-d (Summary) @kindex A D (Summary) @findex gnus-summary-enter-digest-group If the current article is a collection of other articles (for instance, a digest), you might use this command to enter a group based on the that article (@code{gnus-summary-enter-digest-group}). Gnus will try to guess what article type is currently displayed unless you give a prefix to this command, which forces a digest'' interpretation. Basically, whenever you see a message that is a collection of other messages of some format, you @kbd{C-d} and read these messages in a more convenient fashion. @item C-M-d @kindex C-M-d (Summary) @findex gnus-summary-read-document This command is very similar to the one above, but lets you gather several documents into one biiig group (@code{gnus-summary-read-document}). It does this by opening several @code{nndoc} groups for each document, and then opening an @code{nnvirtual} group on top of these @code{nndoc} groups. This command understands the process/prefix convention (@pxref{Process/Prefix}). @item C-t @kindex C-t (Summary) @findex gnus-summary-toggle-truncation Toggle truncation of summary lines (@code{gnus-summary-toggle-truncation}). This will probably confuse the line centering function in the summary buffer, so it's not a good idea to have truncation switched off while reading articles. @item = @kindex = (Summary) @findex gnus-summary-expand-window Expand the summary buffer window (@code{gnus-summary-expand-window}). If given a prefix, force an @code{article} window configuration. @item C-M-e @kindex C-M-e (Summary) @findex gnus-summary-edit-parameters Edit the group parameters (@pxref{Group Parameters}) of the current group (@code{gnus-summary-edit-parameters}). @item C-M-a @kindex C-M-a (Summary) @findex gnus-summary-customize-parameters Customize the group parameters (@pxref{Group Parameters}) of the current group (@code{gnus-summary-customize-parameters}). @end table @node Exiting the Summary Buffer @section Exiting the Summary Buffer @cindex summary exit @cindex exiting groups Exiting from the summary buffer will normally update all info on the group and return you to the group buffer. @table @kbd @item Z Z @itemx Z Q @itemx q @kindex Z Z (Summary) @kindex Z Q (Summary) @kindex q (Summary) @findex gnus-summary-exit @vindex gnus-summary-exit-hook @vindex gnus-summary-prepare-exit-hook @vindex gnus-group-no-more-groups-hook @c @icon{gnus-summary-exit} Exit the current group and update all information on the group (@code{gnus-summary-exit}). @code{gnus-summary-prepare-exit-hook} is called before doing much of the exiting, which calls @code{gnus-summary-expire-articles} by default. @code{gnus-summary-exit-hook} is called after finishing the exit process. @code{gnus-group-no-more-groups-hook} is run when returning to group mode having no more (unread) groups. @item Z E @itemx Q @kindex Z E (Summary) @kindex Q (Summary) @findex gnus-summary-exit-no-update Exit the current group without updating any information on the group (@code{gnus-summary-exit-no-update}). @item Z c @itemx c @kindex Z c (Summary) @kindex c (Summary) @findex gnus-summary-catchup-and-exit @c @icon{gnus-summary-catchup-and-exit} Mark all unticked articles in the group as read and then exit (@code{gnus-summary-catchup-and-exit}). @item Z C @kindex Z C (Summary) @findex gnus-summary-catchup-all-and-exit Mark all articles, even the ticked ones, as read and then exit (@code{gnus-summary-catchup-all-and-exit}). @item Z n @kindex Z n (Summary) @findex gnus-summary-catchup-and-goto-next-group Mark all articles as read and go to the next group (@code{gnus-summary-catchup-and-goto-next-group}). @item Z R @itemx C-x C-s @kindex Z R (Summary) @kindex C-x C-s (Summary) @findex gnus-summary-reselect-current-group Exit this group, and then enter it again (@code{gnus-summary-reselect-current-group}). If given a prefix, select all articles, both read and unread. @item Z G @itemx M-g @kindex Z G (Summary) @kindex M-g (Summary) @findex gnus-summary-rescan-group @c @icon{gnus-summary-mail-get} Exit the group, check for new articles in the group, and select the group (@code{gnus-summary-rescan-group}). If given a prefix, select all articles, both read and unread. @item Z N @kindex Z N (Summary) @findex gnus-summary-next-group Exit the group and go to the next group (@code{gnus-summary-next-group}). @item Z P @kindex Z P (Summary) @findex gnus-summary-prev-group Exit the group and go to the previous group (@code{gnus-summary-prev-group}). @item Z s @kindex Z s (Summary) @findex gnus-summary-save-newsrc Save the current number of read/marked articles in the dribble buffer and then save the dribble buffer (@code{gnus-summary-save-newsrc}). If given a prefix, also save the @file{.newsrc} file(s). Using this command will make exit without updating (the @kbd{Q} command) worthless. @end table @vindex gnus-exit-group-hook @code{gnus-exit-group-hook} is called when you exit the current group with an updating'' exit. For instance @kbd{Q} (@code{gnus-summary-exit-no-update}) does not call this hook. @findex gnus-summary-wake-up-the-dead @findex gnus-dead-summary-mode @vindex gnus-kill-summary-on-exit If you're in the habit of exiting groups, and then changing your mind about it, you might set @code{gnus-kill-summary-on-exit} to @code{nil}. If you do that, Gnus won't kill the summary buffer when you exit it. (Quelle surprise!) Instead it will change the name of the buffer to something like @samp{*Dead Summary ... *} and install a minor mode called @code{gnus-dead-summary-mode}. Now, if you switch back to this buffer, you'll find that all keys are mapped to a function called @code{gnus-summary-wake-up-the-dead}. So tapping any keys in a dead summary buffer will result in a live, normal summary buffer. There will never be more than one dead summary buffer at any one time. @vindex gnus-use-cross-reference The data on the current group will be updated (which articles you have read, which articles you have replied to, etc.) when you exit the summary buffer. If the @code{gnus-use-cross-reference} variable is @code{t} (which is the default), articles that are cross-referenced to this group and are marked as read, will also be marked as read in the other subscribed groups they were cross-posted to. If this variable is neither @code{nil} nor @code{t}, the article will be marked as read in both subscribed and unsubscribed groups (@pxref{Crosspost Handling}). @node Crosspost Handling @section Crosspost Handling @cindex velveeta @cindex spamming Marking cross-posted articles as read ensures that you'll never have to read the same article more than once. Unless, of course, somebody has posted it to several groups separately. Posting the same article to several groups (not cross-posting) is called @dfn{spamming}, and you are by law required to send nasty-grams to anyone who perpetrates such a heinous crime. You may want to try NoCeM handling to filter out spam (@pxref{NoCeM}). Remember: Cross-posting is kinda ok, but posting the same article separately to several groups is not. Massive cross-posting (aka. @dfn{velveeta}) is to be avoided at all costs, and you can even use the @code{gnus-summary-mail-crosspost-complaint} command to complain about excessive crossposting (@pxref{Summary Mail Commands}). @cindex cross-posting @cindex Xref @cindex @acronym{NOV} One thing that may cause Gnus to not do the cross-posting thing correctly is if you use an @acronym{NNTP} server that supports @sc{xover} (which is very nice, because it speeds things up considerably) which does not include the @code{Xref} header in its @acronym{NOV} lines. This is Evil, but all too common, alas, alack. Gnus tries to Do The Right Thing even with @sc{xover} by registering the @code{Xref} lines of all articles you actually read, but if you kill the articles, or just mark them as read without reading them, Gnus will not get a chance to snoop the @code{Xref} lines out of these articles, and will be unable to use the cross reference mechanism. @cindex LIST overview.fmt @cindex overview.fmt To check whether your @acronym{NNTP} server includes the @code{Xref} header in its overview files, try @samp{telnet your.nntp.server nntp}, @samp{MODE READER} on @code{inn} servers, and then say @samp{LIST overview.fmt}. This may not work, but if it does, and the last line you get does not read @samp{Xref:full}, then you should shout and whine at your news admin until she includes the @code{Xref} header in the overview files. @vindex gnus-nov-is-evil If you want Gnus to get the @code{Xref}s right all the time, you have to set @code{gnus-nov-is-evil} to @code{t}, which slows things down considerably. C'est la vie. For an alternative approach, @pxref{Duplicate Suppression}. @node Duplicate Suppression @section Duplicate Suppression By default, Gnus tries to make sure that you don't have to read the same article more than once by utilizing the crossposting mechanism (@pxref{Crosspost Handling}). However, that simple and efficient approach may not work satisfactory for some users for various reasons. @enumerate @item The @acronym{NNTP} server may fail to generate the @code{Xref} header. This is evil and not very common. @item The @acronym{NNTP} server may fail to include the @code{Xref} header in the @file{.overview} data bases. This is evil and all too common, alas. @item You may be reading the same group (or several related groups) from different @acronym{NNTP} servers. @item You may be getting mail that duplicates articles posted to groups. @end enumerate I'm sure there are other situations where @code{Xref} handling fails as well, but these four are the most common situations. If, and only if, @code{Xref} handling fails for you, then you may consider switching on @dfn{duplicate suppression}. If you do so, Gnus will remember the @code{Message-ID}s of all articles you have read or otherwise marked as read, and then, as if by magic, mark them as read all subsequent times you see them---in @emph{all} groups. Using this mechanism is quite likely to be somewhat inefficient, but not overly so. It's certainly preferable to reading the same articles more than once. Duplicate suppression is not a very subtle instrument. It's more like a sledge hammer than anything else. It works in a very simple fashion---if you have marked an article as read, it adds this Message-ID to a cache. The next time it sees this Message-ID, it will mark the article as read with the @samp{M} mark. It doesn't care what group it saw the article in. @table @code @item gnus-suppress-duplicates @vindex gnus-suppress-duplicates If non-@code{nil}, suppress duplicates. @item gnus-save-duplicate-list @vindex gnus-save-duplicate-list If non-@code{nil}, save the list of duplicates to a file. This will make startup and shutdown take longer, so the default is @code{nil}. However, this means that only duplicate articles read in a single Gnus session are suppressed. @item gnus-duplicate-list-length @vindex gnus-duplicate-list-length This variable says how many @code{Message-ID}s to keep in the duplicate suppression list. The default is 10000. @item gnus-duplicate-file @vindex gnus-duplicate-file The name of the file to store the duplicate suppression list in. The default is @file{~/News/suppression}. @end table If you have a tendency to stop and start Gnus often, setting @code{gnus-save-duplicate-list} to @code{t} is probably a good idea. If you leave Gnus running for weeks on end, you may have it @code{nil}. On the other hand, saving the list makes startup and shutdown much slower, so that means that if you stop and start Gnus often, you should set @code{gnus-save-duplicate-list} to @code{nil}. Uhm. I'll leave this up to you to figure out, I think. @node Security @section Security Gnus is able to verify signed messages or decrypt encrypted messages. The formats that are supported are @acronym{PGP}, @acronym{PGP/MIME} and @acronym{S/MIME}, however you need some external programs to get things to work: @enumerate @item To handle @acronym{PGP} and @acronym{PGP/MIME} messages, you have to install an OpenPGP implementation such as GnuPG. The Lisp interface to GnuPG included with Gnus is called PGG (@pxref{Top, ,PGG, pgg, PGG Manual}), but Mailcrypt and gpg.el are also supported. @item To handle @acronym{S/MIME} message, you need to install OpenSSL. OpenSSL 0.9.6 or newer is recommended. @end enumerate The variables that control security functionality on reading messages include: @table @code @item mm-verify-option @vindex mm-verify-option Option of verifying signed parts. @code{never}, not verify; @code{always}, always verify; @code{known}, only verify known protocols. Otherwise, ask user. @item mm-decrypt-option @vindex mm-decrypt-option Option of decrypting encrypted parts. @code{never}, no decryption; @code{always}, always decrypt; @code{known}, only decrypt known protocols. Otherwise, ask user. @item mml1991-use @vindex mml1991-use Symbol indicating elisp interface to OpenPGP implementation for @acronym{PGP} messages. The default is @code{pgg}, but @code{mailcrypt} and @code{gpg} are also supported although deprecated. @item mml2015-use @vindex mml2015-use Symbol indicating elisp interface to OpenPGP implementation for @acronym{PGP/MIME} messages. The default is @code{pgg}, but @code{mailcrypt} and @code{gpg} are also supported although deprecated. @end table By default the buttons that display security information are not shown, because they clutter reading the actual e-mail. You can type @kbd{K b} manually to display the information. Use the @code{gnus-buttonized-mime-types} and @code{gnus-unbuttonized-mime-types} variables to control this permanently. @ref{MIME Commands} for further details, and hints on how to customize these variables to always display security information. @cindex snarfing keys @cindex importing PGP keys @cindex PGP key ring import Snarfing OpenPGP keys (i.e., importing keys from articles into your key ring) is not supported explicitly through a menu item or command, rather Gnus do detect and label keys as @samp{application/pgp-keys}, allowing you to specify whatever action you think is appropriate through the usual @acronym{MIME} infrastructure. You can use a @file{~/.mailcap} entry (@pxref{mailcap, , mailcap, emacs-mime, The Emacs MIME Manual}) such as the following to import keys using GNU Privacy Guard when you click on the @acronym{MIME} button (@pxref{Using MIME}). @example application/pgp-keys; gpg --import --interactive --verbose; needsterminal @end example @noindent This happens to also be the default action defined in @code{mailcap-mime-data}. More information on how to set things for sending outgoing signed and encrypted messages up can be found in the message manual (@pxref{Security, ,Security, message, Message Manual}). @node Mailing List @section Mailing List @cindex mailing list @cindex RFC 2396 @kindex A M (summary) @findex gnus-mailing-list-insinuate Gnus understands some mailing list fields of RFC 2369. To enable it, add a @code{to-list} group parameter (@pxref{Group Parameters}), possibly using @kbd{A M} (@code{gnus-mailing-list-insinuate}) in the summary buffer. That enables the following commands to the summary buffer: @table @kbd @item C-c C-n h @kindex C-c C-n h (Summary) @findex gnus-mailing-list-help Send a message to fetch mailing list help, if List-Help field exists. @item C-c C-n s @kindex C-c C-n s (Summary) @findex gnus-mailing-list-subscribe Send a message to subscribe the mailing list, if List-Subscribe field exists. @item C-c C-n u @kindex C-c C-n u (Summary) @findex gnus-mailing-list-unsubscribe Send a message to unsubscribe the mailing list, if List-Unsubscribe field exists. @item C-c C-n p @kindex C-c C-n p (Summary) @findex gnus-mailing-list-post Post to the mailing list, if List-Post field exists. @item C-c C-n o @kindex C-c C-n o (Summary) @findex gnus-mailing-list-owner Send a message to the mailing list owner, if List-Owner field exists. @item C-c C-n a @kindex C-c C-n a (Summary) @findex gnus-mailing-list-owner Browse the mailing list archive, if List-Archive field exists. @end table @node Article Buffer @chapter Article Buffer @cindex article buffer The articles are displayed in the article buffer, of which there is only one. All the summary buffers share the same article buffer unless you tell Gnus otherwise. @menu * Hiding Headers:: Deciding what headers should be displayed. * Using MIME:: Pushing articles through @acronym{MIME} before reading them. * Customizing Articles:: Tailoring the look of the articles. * Article Keymap:: Keystrokes available in the article buffer. * Misc Article:: Other stuff. @end menu @node Hiding Headers @section Hiding Headers @cindex hiding headers @cindex deleting headers The top section of each article is the @dfn{head}. (The rest is the @dfn{body}, but you may have guessed that already.) @vindex gnus-show-all-headers There is a lot of useful information in the head: the name of the person who wrote the article, the date it was written and the subject of the article. That's well and nice, but there's also lots of information most people do not want to see---what systems the article has passed through before reaching you, the @code{Message-ID}, the @code{References}, etc. ad nauseam---and you'll probably want to get rid of some of those lines. If you want to keep all those lines in the article buffer, you can set @code{gnus-show-all-headers} to @code{t}. Gnus provides you with two variables for sifting headers: @table @code @item gnus-visible-headers @vindex gnus-visible-headers If this variable is non-@code{nil}, it should be a regular expression that says what headers you wish to keep in the article buffer. All headers that do not match this variable will be hidden. For instance, if you only want to see the name of the person who wrote the article and the subject, you'd say: @lisp (setq gnus-visible-headers "^From:\\|^Subject:") @end lisp This variable can also be a list of regexps to match headers to remain visible. @item gnus-ignored-headers @vindex gnus-ignored-headers This variable is the reverse of @code{gnus-visible-headers}. If this variable is set (and @code{gnus-visible-headers} is @code{nil}), it should be a regular expression that matches all lines that you want to hide. All lines that do not match this variable will remain visible. For instance, if you just want to get rid of the @code{References} line and the @code{Xref} line, you might say: @lisp (setq gnus-ignored-headers "^References:\\|^Xref:") @end lisp This variable can also be a list of regexps to match headers to be removed. Note that if @code{gnus-visible-headers} is non-@code{nil}, this variable will have no effect. @end table @vindex gnus-sorted-header-list Gnus can also sort the headers for you. (It does this by default.) You can control the sorting by setting the @code{gnus-sorted-header-list} variable. It is a list of regular expressions that says in what order the headers are to be displayed. For instance, if you want the name of the author of the article first, and then the subject, you might say something like: @lisp (setq gnus-sorted-header-list '("^From:" "^Subject:")) @end lisp Any headers that are to remain visible, but are not listed in this variable, will be displayed in random order after all the headers listed in this variable. @findex gnus-article-hide-boring-headers @vindex gnus-boring-article-headers You can hide further boring headers by setting @code{gnus-treat-hide-boring-headers} to @code{head}. What this function does depends on the @code{gnus-boring-article-headers} variable. It's a list, but this list doesn't actually contain header names. Instead it lists various @dfn{boring conditions} that Gnus can check and remove from sight. These conditions are: @table @code @item empty Remove all empty headers. @item followup-to Remove the @code{Followup-To} header if it is identical to the @code{Newsgroups} header. @item reply-to Remove the @code{Reply-To} header if it lists the same addresses as the @code{From} header, or if the @code{broken-reply-to} group parameter is set. @item newsgroups Remove the @code{Newsgroups} header if it only contains the current group name. @item to-address Remove the @code{To} header if it only contains the address identical to the current group's @code{to-address} parameter. @item to-list Remove the @code{To} header if it only contains the address identical to the current group's @code{to-list} parameter. @item cc-list Remove the @code{Cc} header if it only contains the address identical to the current group's @code{to-list} parameter. @item date Remove the @code{Date} header if the article is less than three days old. @item long-to Remove the @code{To} and/or @code{Cc} header if it is very long. @item many-to Remove all @code{To} and/or @code{Cc} headers if there are more than one. @end table To include these three elements, you could say something like: @lisp (setq gnus-boring-article-headers '(empty followup-to reply-to)) @end lisp This is also the default value for this variable. @node Using MIME @section Using MIME @cindex @acronym{MIME} Mime is a standard for waving your hands through the air, aimlessly, while people stand around yawning. @acronym{MIME}, however, is a standard for encoding your articles, aimlessly, while all newsreaders die of fear. @acronym{MIME} may specify what character set the article uses, the encoding of the characters, and it also makes it possible to embed pictures and other naughty stuff in innocent-looking articles. @vindex gnus-display-mime-function @findex gnus-display-mime Gnus pushes @acronym{MIME} articles through @code{gnus-display-mime-function} to display the @acronym{MIME} parts. This is @code{gnus-display-mime} by default, which creates a bundle of clickable buttons that can be used to display, save and manipulate the @acronym{MIME} objects. The following commands are available when you have placed point over a @acronym{MIME} button: @table @kbd @findex gnus-article-press-button @item RET (Article) @kindex RET (Article) @itemx BUTTON-2 (Article) Toggle displaying of the @acronym{MIME} object (@code{gnus-article-press-button}). If built-in viewers can not display the object, Gnus resorts to external viewers in the @file{mailcap} files. If a viewer has the @samp{copiousoutput} specification, the object is displayed inline. @findex gnus-mime-view-part @item M-RET (Article) @kindex M-RET (Article) @itemx v (Article) Prompt for a method, and then view the @acronym{MIME} object using this method (@code{gnus-mime-view-part}). @findex gnus-mime-view-part-as-type @item t (Article) @kindex t (Article) View the @acronym{MIME} object as if it were a different @acronym{MIME} media type (@code{gnus-mime-view-part-as-type}). @findex gnus-mime-view-part-as-charset @item C (Article) @kindex C (Article) Prompt for a charset, and then view the @acronym{MIME} object using this charset (@code{gnus-mime-view-part-as-charset}). @findex gnus-mime-save-part @item o (Article) @kindex o (Article) Prompt for a file name, and then save the @acronym{MIME} object (@code{gnus-mime-save-part}). @findex gnus-mime-save-part-and-strip @item C-o (Article) @kindex C-o (Article) Prompt for a file name, then save the @acronym{MIME} object and strip it from the article. Then proceed to article editing, where a reasonable suggestion is being made on how the altered article should look like. The stripped @acronym{MIME} object will be referred via the message/external-body @acronym{MIME} type. (@code{gnus-mime-save-part-and-strip}). @findex gnus-mime-delete-part @item d (Article) @kindex d (Article) Delete the @acronym{MIME} object from the article and replace it with some information about the removed @acronym{MIME} object (@code{gnus-mime-delete-part}). @findex gnus-mime-copy-part @item c (Article) @kindex c (Article) Copy the @acronym{MIME} object to a fresh buffer and display this buffer (@code{gnus-mime-copy-part}). Compressed files like @file{.gz} and @file{.bz2} are automatically decompressed if @code{auto-compression-mode} is enabled (@pxref{Compressed Files,, Accessing Compressed Files, emacs, The Emacs Editor}). @findex gnus-mime-print-part @item p (Article) @kindex p (Article) Print the @acronym{MIME} object (@code{gnus-mime-print-part}). This command respects the @samp{print=} specifications in the @file{.mailcap} file. @findex gnus-mime-inline-part @item i (Article) @kindex i (Article) Insert the contents of the @acronym{MIME} object into the buffer (@code{gnus-mime-inline-part}) as text/plain. If given a prefix, insert the raw contents without decoding. If given a numerical prefix, you can do semi-manual charset stuff (see @code{gnus-summary-show-article-charset-alist} in @ref{Paging the Article}). @findex gnus-mime-view-part-internally @item E (Article) @kindex E (Article) View the @acronym{MIME} object with an internal viewer. If no internal viewer is available, use an external viewer (@code{gnus-mime-view-part-internally}). @findex gnus-mime-view-part-externally @item e (Article) @kindex e (Article) View the @acronym{MIME} object with an external viewer. (@code{gnus-mime-view-part-externally}). @findex gnus-mime-pipe-part @item | (Article) @kindex | (Article) Output the @acronym{MIME} object to a process (@code{gnus-mime-pipe-part}). @findex gnus-mime-action-on-part @item . (Article) @kindex . (Article) Interactively run an action on the @acronym{MIME} object (@code{gnus-mime-action-on-part}). @end table Gnus will display some @acronym{MIME} objects automatically. The way Gnus determines which parts to do this with is described in the Emacs @acronym{MIME} manual. It might be best to just use the toggling functions from the article buffer to avoid getting nasty surprises. (For instance, you enter the group @samp{alt.sing-a-long} and, before you know it, @acronym{MIME} has decoded the sound file in the article and some horrible sing-a-long song comes screaming out your speakers, and you can't find the volume button, because there isn't one, and people are starting to look at you, and you try to stop the program, but you can't, and you can't find the program to control the volume, and everybody else in the room suddenly decides to look at you disdainfully, and you'll feel rather stupid.) Any similarity to real events and people is purely coincidental. Ahem. Also @pxref{MIME Commands}. @node Customizing Articles @section Customizing Articles @cindex article customization A slew of functions for customizing how the articles are to look like exist. You can call these functions interactively (@pxref{Article Washing}), or you can have them called automatically when you select the articles. To have them called automatically, you should set the corresponding treatment'' variable. For instance, to have headers hidden, you'd set @code{gnus-treat-hide-headers}. Below is a list of variables that can be set, but first we discuss the values these variables can have. Note: Some values, while valid, make little sense. Check the list below for sensible values. @enumerate @item @code{nil}: Don't do this treatment. @item @code{t}: Do this treatment on all body parts. @item @code{head}: Do the treatment on the headers. @item @code{last}: Do this treatment on the last part. @item An integer: Do this treatment on all body parts that have a length less than this number. @item A list of strings: Do this treatment on all body parts that are in articles that are read in groups that have names that match one of the regexps in the list. @item A list where the first element is not a string: The list is evaluated recursively. The first element of the list is a predicate. The following predicates are recognized: @code{or}, @code{and}, @code{not} and @code{typep}. Here's an example: @lisp (or last (typep "text/x-vcard")) @end lisp @end enumerate You may have noticed that the word @dfn{part} is used here. This refers to the fact that some messages are @acronym{MIME} multipart articles that may be divided into several parts. Articles that are not multiparts are considered to contain just a single part. @vindex gnus-article-treat-types Are the treatments applied to all sorts of multipart parts? Yes, if you want to, but by default, only @samp{text/plain} parts are given the treatment. This is controlled by the @code{gnus-article-treat-types} variable, which is a list of regular expressions that are matched to the type of the part. This variable is ignored if the value of the controlling variable is a predicate list, as described above. @ifinfo @c Avoid sort of redundant entries in the same section for the printed @c manual, but add them in info to allow i gnus-treat-foo-bar RET' or @c i foo-bar'. @vindex gnus-treat-buttonize @vindex gnus-treat-buttonize-head @vindex gnus-treat-capitalize-sentences @vindex gnus-treat-overstrike @vindex gnus-treat-strip-cr @vindex gnus-treat-strip-headers-in-body @vindex gnus-treat-strip-leading-blank-lines @vindex gnus-treat-strip-multiple-blank-lines @vindex gnus-treat-strip-pem @vindex gnus-treat-strip-trailing-blank-lines @vindex gnus-treat-unsplit-urls @vindex gnus-treat-wash-html @vindex gnus-treat-date-english @vindex gnus-treat-date-iso8601 @vindex gnus-treat-date-lapsed @vindex gnus-treat-date-local @vindex gnus-treat-date-original @vindex gnus-treat-date-user-defined @vindex gnus-treat-date-ut @vindex gnus-treat-from-picon @vindex gnus-treat-mail-picon @vindex gnus-treat-newsgroups-picon @vindex gnus-treat-display-smileys @vindex gnus-treat-body-boundary @vindex gnus-treat-display-x-face @vindex gnus-treat-display-face @vindex gnus-treat-emphasize @vindex gnus-treat-fill-article @vindex gnus-treat-fill-long-lines @vindex gnus-treat-hide-boring-headers @vindex gnus-treat-hide-citation @vindex gnus-treat-hide-citation-maybe @vindex gnus-treat-hide-headers @vindex gnus-treat-hide-signature @vindex gnus-treat-strip-banner @vindex gnus-treat-strip-list-identifiers @vindex gnus-treat-highlight-citation @vindex gnus-treat-highlight-headers @vindex gnus-treat-highlight-signature @vindex gnus-treat-play-sounds @vindex gnus-treat-translate @vindex gnus-treat-x-pgp-sig @vindex gnus-treat-unfold-headers @vindex gnus-treat-fold-headers @vindex gnus-treat-fold-newsgroups @vindex gnus-treat-leading-whitespace @end ifinfo The following treatment options are available. The easiest way to customize this is to examine the @code{gnus-article-treat} customization group. Values in parenthesis are suggested sensible values. Others are possible but those listed are probably sufficient for most people. @table @code @item gnus-treat-buttonize (t, integer) @item gnus-treat-buttonize-head (head) @xref{Article Buttons}. @item gnus-treat-capitalize-sentences (t, integer) @item gnus-treat-overstrike (t, integer) @item gnus-treat-strip-cr (t, integer) @item gnus-treat-strip-headers-in-body (t, integer) @item gnus-treat-strip-leading-blank-lines (t, integer) @item gnus-treat-strip-multiple-blank-lines (t, integer) @item gnus-treat-strip-pem (t, last, integer) @item gnus-treat-strip-trailing-blank-lines (t, last, integer) @item gnus-treat-unsplit-urls (t, integer) @item gnus-treat-wash-html (t, integer) @xref{Article Washing}. @item gnus-treat-date-english (head) @item gnus-treat-date-iso8601 (head) @item gnus-treat-date-lapsed (head) @item gnus-treat-date-local (head) @item gnus-treat-date-original (head) @item gnus-treat-date-user-defined (head) @item gnus-treat-date-ut (head) @xref{Article Date}. @item gnus-treat-from-picon (head) @item gnus-treat-mail-picon (head) @item gnus-treat-newsgroups-picon (head) @xref{Picons}. @item gnus-treat-display-smileys (t, integer) @item gnus-treat-body-boundary (head) @vindex gnus-body-boundary-delimiter Adds a delimiter between header and body, the string used as delimiter is controlled by @code{gnus-body-boundary-delimiter}. @xref{Smileys}. @vindex gnus-treat-display-x-face @item gnus-treat-display-x-face (head) @xref{X-Face}. @vindex gnus-treat-display-face @item gnus-treat-display-face (head) @xref{Face}. @vindex gnus-treat-emphasize @item gnus-treat-emphasize (t, head, integer) @vindex gnus-treat-fill-article @item gnus-treat-fill-article (t, integer) @vindex gnus-treat-fill-long-lines @item gnus-treat-fill-long-lines (t, integer) @vindex gnus-treat-hide-boring-headers @item gnus-treat-hide-boring-headers (head) @vindex gnus-treat-hide-citation @item gnus-treat-hide-citation (t, integer) @vindex gnus-treat-hide-citation-maybe @item gnus-treat-hide-citation-maybe (t, integer) @vindex gnus-treat-hide-headers @item gnus-treat-hide-headers (head) @vindex gnus-treat-hide-signature @item gnus-treat-hide-signature (t, last) @vindex gnus-treat-strip-banner @item gnus-treat-strip-banner (t, last) @vindex gnus-treat-strip-list-identifiers @item gnus-treat-strip-list-identifiers (head) @xref{Article Hiding}. @vindex gnus-treat-highlight-citation @item gnus-treat-highlight-citation (t, integer) @vindex gnus-treat-highlight-headers @item gnus-treat-highlight-headers (head) @vindex gnus-treat-highlight-signature @item gnus-treat-highlight-signature (t, last, integer) @xref{Article Highlighting}. @vindex gnus-treat-play-sounds @item gnus-treat-play-sounds @vindex gnus-treat-translate @item gnus-treat-translate @vindex gnus-treat-x-pgp-sig @item gnus-treat-x-pgp-sig (head) @vindex gnus-treat-unfold-headers @item gnus-treat-unfold-headers (head) @vindex gnus-treat-fold-headers @item gnus-treat-fold-headers (head) @vindex gnus-treat-fold-newsgroups @item gnus-treat-fold-newsgroups (head) @vindex gnus-treat-leading-whitespace @item gnus-treat-leading-whitespace (head) @xref{Article Header}. @end table @vindex gnus-part-display-hook You can, of course, write your own functions to be called from @code{gnus-part-display-hook}. The functions are called narrowed to the part, and you can do anything you like, pretty much. There is no information that you have to keep in the buffer---you can change everything. @node Article Keymap @section Article Keymap Most of the keystrokes in the summary buffer can also be used in the article buffer. They should behave as if you typed them in the summary buffer, which means that you don't actually have to have a summary buffer displayed while reading. You can do it all from the article buffer. @kindex v (Article) @cindex keys, reserved for users (Article) The key @kbd{v} is reserved for users. You can bind it key to some function or better use it as a prefix key. A few additional keystrokes are available: @table @kbd @item SPACE @kindex SPACE (Article) @findex gnus-article-next-page Scroll forwards one page (@code{gnus-article-next-page}). This is exactly the same as @kbd{h SPACE h}. @item DEL @kindex DEL (Article) @findex gnus-article-prev-page Scroll backwards one page (@code{gnus-article-prev-page}). This is exactly the same as @kbd{h DEL h}. @item C-c ^ @kindex C-c ^ (Article) @findex gnus-article-refer-article If point is in the neighborhood of a @code{Message-ID} and you press @kbd{C-c ^}, Gnus will try to get that article from the server (@code{gnus-article-refer-article}). @item C-c C-m @kindex C-c C-m (Article) @findex gnus-article-mail Send a reply to the address near point (@code{gnus-article-mail}). If given a prefix, include the mail. @item s @kindex s (Article) @findex gnus-article-show-summary Reconfigure the buffers so that the summary buffer becomes visible (@code{gnus-article-show-summary}). @item ? @kindex ? (Article) @findex gnus-article-describe-briefly Give a very brief description of the available keystrokes (@code{gnus-article-describe-briefly}). @item TAB @kindex TAB (Article) @findex gnus-article-next-button Go to the next button, if any (@code{gnus-article-next-button}). This only makes sense if you have buttonizing turned on. @item M-TAB @kindex M-TAB (Article) @findex gnus-article-prev-button Go to the previous button, if any (@code{gnus-article-prev-button}). @item R @kindex R (Article) @findex gnus-article-reply-with-original Send a reply to the current article and yank the current article (@code{gnus-article-reply-with-original}). If given a prefix, make a wide reply. If the region is active, only yank the text in the region. @item F @kindex F (Article) @findex gnus-article-followup-with-original Send a followup to the current article and yank the current article (@code{gnus-article-followup-with-original}). If given a prefix, make a wide reply. If the region is active, only yank the text in the region. @end table @node Misc Article @section Misc Article @table @code @item gnus-single-article-buffer @vindex gnus-single-article-buffer If non-@code{nil}, use the same article buffer for all the groups. (This is the default.) If @code{nil}, each group will have its own article buffer. @vindex gnus-article-decode-hook @item gnus-article-decode-hook @cindex @acronym{MIME} Hook used to decode @acronym{MIME} articles. The default value is @code{(article-decode-charset article-decode-encoded-words)} @vindex gnus-article-prepare-hook @item gnus-article-prepare-hook This hook is called right after the article has been inserted into the article buffer. It is mainly intended for functions that do something depending on the contents; it should probably not be used for changing the contents of the article buffer. @item gnus-article-mode-hook @vindex gnus-article-mode-hook Hook called in article mode buffers. @item gnus-article-mode-syntax-table @vindex gnus-article-mode-syntax-table Syntax table used in article buffers. It is initialized from @code{text-mode-syntax-table}. @vindex gnus-article-over-scroll @item gnus-article-over-scroll If non-@code{nil}, allow scrolling the article buffer even when there no more new text to scroll in. The default is @code{nil}. @vindex gnus-article-mode-line-format @item gnus-article-mode-line-format This variable is a format string along the same lines as @code{gnus-summary-mode-line-format} (@pxref{Summary Buffer Mode Line}). It accepts the same format specifications as that variable, with two extensions: @table @samp @item w The @dfn{wash status} of the article. This is a short string with one character for each possible article wash operation that may have been performed. The characters and their meaning: @table @samp @item c Displayed when cited text may be hidden in the article buffer. @item h Displayed when headers are hidden in the article buffer. @item p Displayed when article is digitally signed or encrypted, and Gnus has hidden the security headers. (N.B. does not tell anything about security status, i.e. good or bad signature.) @item s Displayed when the signature has been hidden in the Article buffer. @item o Displayed when Gnus has treated overstrike characters in the article buffer. @item e Displayed when Gnus has treated emphasised strings in the article buffer. @end table @item m The number of @acronym{MIME} parts in the article. @end table @vindex gnus-break-pages @item gnus-break-pages Controls whether @dfn{page breaking} is to take place. If this variable is non-@code{nil}, the articles will be divided into pages whenever a page delimiter appears in the article. If this variable is @code{nil}, paging will not be done. @item gnus-page-delimiter @vindex gnus-page-delimiter This is the delimiter mentioned above. By default, it is @samp{^L} (formfeed). @cindex IDNA @cindex internationalized domain names @vindex gnus-use-idna @item gnus-use-idna This variable controls whether Gnus performs IDNA decoding of internationalized domain names inside @samp{From}, @samp{To} and @samp{Cc} headers. This requires @uref{http://www.gnu.org/software/libidn/, GNU Libidn}, and this variable is only enabled if you have installed it. @end table @node Composing Messages @chapter Composing Messages @cindex composing messages @cindex messages @cindex mail @cindex sending mail @cindex reply @cindex followup @cindex post @cindex using gpg @cindex using s/mime @cindex using smime @kindex C-c C-c (Post) All commands for posting and mailing will put you in a message buffer where you can edit the article all you like, before you send the article by pressing @kbd{C-c C-c}. @xref{Top, , Overview, message, Message Manual}. Where the message will be posted/mailed to depends on your setup (@pxref{Posting Server}). @menu * Mail:: Mailing and replying. * Posting Server:: What server should you post and mail via? * POP before SMTP:: You cannot send a mail unless you read a mail. * Mail and Post:: Mailing and posting at the same time. * Archived Messages:: Where Gnus stores the messages you've sent. * Posting Styles:: An easier way to specify who you are. * Drafts:: Postponing messages and rejected messages. * Rejected Articles:: What happens if the server doesn't like your article? * Signing and encrypting:: How to compose secure messages. @end menu Also @pxref{Canceling and Superseding} for information on how to remove articles you shouldn't have posted. @node Mail @section Mail Variables for customizing outgoing mail: @table @code @item gnus-uu-digest-headers @vindex gnus-uu-digest-headers List of regexps to match headers included in digested messages. The headers will be included in the sequence they are matched. If @code{nil} include all headers. @item gnus-add-to-list @vindex gnus-add-to-list If non-@code{nil}, add a @code{to-list} group parameter to mail groups that have none when you do a @kbd{a}. @item gnus-confirm-mail-reply-to-news @vindex gnus-confirm-mail-reply-to-news If non-@code{nil}, Gnus will ask you for a confirmation when you are about to reply to news articles by mail. If it is @code{nil}, nothing interferes in what you want to do. This can also be a function receiving the group name as the only parameter which should return non-@code{nil} if a confirmation is needed, or a regular expression matching group names, where confirmation should be asked for. If you find yourself never wanting to reply to mail, but occasionally press @kbd{R} anyway, this variable might be for you. @item gnus-confirm-treat-mail-like-news @vindex gnus-confirm-treat-mail-like-news If non-@code{nil}, Gnus also requests confirmation according to @code{gnus-confirm-mail-reply-to-news} when replying to mail. This is useful for treating mailing lists like newsgroups. @end table @node Posting Server @section Posting Server When you press those magical @kbd{C-c C-c} keys to ship off your latest (extremely intelligent, of course) article, where does it go? Thank you for asking. I hate you. It can be quite complicated. @vindex gnus-post-method When posting news, Message usually invokes @code{message-send-news} (@pxref{News Variables, , News Variables, message, Message Manual}). Normally, Gnus will post using the same select method as you're reading from (which might be convenient if you're reading lots of groups from different private servers). However. If the server you're reading from doesn't allow posting, just reading, you probably want to use some other server to post your (extremely intelligent and fabulously interesting) articles. You can then set the @code{gnus-post-method} to some other method: @lisp (setq gnus-post-method '(nnspool "")) @end lisp Now, if you've done this, and then this server rejects your article, or this server is down, what do you do then? To override this variable you can use a non-zero prefix to the @kbd{C-c C-c} command to force using the current'' server, to get back the default behavior, for posting. If you give a zero prefix (i.e., @kbd{C-u 0 C-c C-c}) to that command, Gnus will prompt you for what method to use for posting. You can also set @code{gnus-post-method} to a list of select methods. If that's the case, Gnus will always prompt you for what method to use for posting. Finally, if you want to always post using the native select method, you can set this variable to @code{native}. When sending mail, Message invokes @code{message-send-mail-function}. The default function, @code{message-send-mail-with-sendmail}, pipes your article to the @code{sendmail} binary for further queuing and sending. When your local system is not configured for sending mail using @code{sendmail}, and you have access to a remote @acronym{SMTP} server, you can set @code{message-send-mail-function} to @code{smtpmail-send-it} and make sure to setup the @code{smtpmail} package correctly. An example: @lisp (setq message-send-mail-function 'smtpmail-send-it smtpmail-default-smtp-server "YOUR SMTP HOST") @end lisp To the thing similar to this, there is @code{message-smtpmail-send-it}. It is useful if your @acronym{ISP} requires the @acronym{POP}-before-@acronym{SMTP} authentication. @xref{POP before SMTP}. Other possible choices for @code{message-send-mail-function} includes @code{message-send-mail-with-mh}, @code{message-send-mail-with-qmail}, and @code{feedmail-send-it}. @node POP before SMTP @section POP before SMTP @cindex pop before smtp @findex message-smtpmail-send-it @findex mail-source-touch-pop Does your @acronym{ISP} require the @acronym{POP}-before-@acronym{SMTP} authentication? It is whether you need to connect to the @acronym{POP} mail server within a certain time before sending mails. If so, there is a convenient way. To do that, put the following lines in your @file{~/.gnus.el} file: @lisp (setq message-send-mail-function 'message-smtpmail-send-it) (add-hook 'message-send-mail-hook 'mail-source-touch-pop) @end lisp @noindent It means to let Gnus connect to the @acronym{POP} mail server in advance whenever you send a mail. The @code{mail-source-touch-pop} function does only a @acronym{POP} authentication according to the value of @code{mail-sources} without fetching mails, just before sending a mail. Note that you have to use @code{message-smtpmail-send-it} which runs @code{message-send-mail-hook} rather than @code{smtpmail-send-it} and set the value of @code{mail-sources} for a @acronym{POP} connection correctly. @xref{Mail Sources}. If you have two or more @acronym{POP} mail servers set in @code{mail-sources}, you may want to specify one of them to @code{mail-source-primary-source} as the @acronym{POP} mail server to be used for the @acronym{POP}-before-@acronym{SMTP} authentication. If it is your primary @acronym{POP} mail server (i.e., you are fetching mails mainly from that server), you can set it permanently as follows: @lisp (setq mail-source-primary-source '(pop :server "pop3.mail.server" :password "secret")) @end lisp @noindent Otherwise, bind it dynamically only when performing the @acronym{POP}-before-@acronym{SMTP} authentication as follows: @lisp (add-hook 'message-send-mail-hook (lambda () (let ((mail-source-primary-source '(pop :server "pop3.mail.server" :password "secret"))) (mail-source-touch-pop)))) @end lisp @node Mail and Post @section Mail and Post Here's a list of variables relevant to both mailing and posting: @table @code @item gnus-mailing-list-groups @findex gnus-mailing-list-groups @cindex mailing lists If your news server offers groups that are really mailing lists gatewayed to the @acronym{NNTP} server, you can read those groups without problems, but you can't post/followup to them without some difficulty. One solution is to add a @code{to-address} to the group parameters (@pxref{Group Parameters}). An easier thing to do is set the @code{gnus-mailing-list-groups} to a regexp that matches the groups that really are mailing lists. Then, at least, followups to the mailing lists will work most of the time. Posting to these groups (@kbd{a}) is still a pain, though. @item gnus-user-agent @vindex gnus-user-agent @cindex User-Agent This variable controls which information should be exposed in the User-Agent header. It can be a list of symbols or a string. Valid symbols are @code{gnus} (show Gnus version) and @code{emacs} (show Emacs version). In addition to the Emacs version, you can add @code{codename} (show (S)XEmacs codename) or either @code{config} (show system configuration) or @code{type} (show system type). If you set it to a string, be sure to use a valid format, see RFC 2616. @end table You may want to do spell-checking on messages that you send out. Or, if you don't want to spell-check by hand, you could add automatic spell-checking via the @code{ispell} package: @cindex ispell @findex ispell-message @lisp (add-hook 'message-send-hook 'ispell-message) @end lisp If you want to change the @code{ispell} dictionary based on what group you're in, you could say something like the following: @lisp (add-hook 'gnus-select-group-hook (lambda () (cond ((string-match "^de\\." (gnus-group-real-name gnus-newsgroup-name)) (ispell-change-dictionary "deutsch")) (t (ispell-change-dictionary "english"))))) @end lisp Modify to suit your needs. @node Archived Messages @section Archived Messages @cindex archived messages @cindex sent messages Gnus provides a few different methods for storing the mail and news you send. The default method is to use the @dfn{archive virtual server} to store the messages. If you want to disable this completely, the @code{gnus-message-archive-group} variable should be @code{nil}, which is the default. For archiving interesting messages in a group you read, see the @kbd{B c} (@code{gnus-summary-copy-article}) command (@pxref{Mail Group Commands}). @vindex gnus-message-archive-method @code{gnus-message-archive-method} says what virtual server Gnus is to use to store sent messages. The default is: @lisp (nnfolder "archive" (nnfolder-directory "~/Mail/archive") (nnfolder-active-file "~/Mail/archive/active") (nnfolder-get-new-mail nil) (nnfolder-inhibit-expiry t)) @end lisp You can, however, use any mail select method (@code{nnml}, @code{nnmbox}, etc.). @code{nnfolder} is a quite likable select method for doing this sort of thing, though. If you don't like the default directory chosen, you could say something like: @lisp (setq gnus-message-archive-method '(nnfolder "archive" (nnfolder-inhibit-expiry t) (nnfolder-active-file "~/News/sent-mail/active") (nnfolder-directory "~/News/sent-mail/"))) @end lisp @vindex gnus-message-archive-group @cindex Gcc Gnus will insert @code{Gcc} headers in all outgoing messages that point to one or more group(s) on that server. Which group to use is determined by the @code{gnus-message-archive-group} variable. This variable can be used to do the following: @table @asis @item a string Messages will be saved in that group. Note that you can include a select method in the group name, then the message will not be stored in the select method given by @code{gnus-message-archive-method}, but in the select method specified by the group name, instead. Suppose @code{gnus-message-archive-method} has the default value shown above. Then setting @code{gnus-message-archive-group} to @code{"foo"} means that outgoing messages are stored in @samp{nnfolder+archive:foo}, but if you use the value @code{"nnml:foo"}, then outgoing messages will be stored in @samp{nnml:foo}. @item a list of strings Messages will be saved in all those groups. @item an alist of regexps, functions and forms When a key matches'', the result is used. @item @code{nil} No message archiving will take place. This is the default. @end table Let's illustrate: Just saving to a single group called @samp{MisK}: @lisp (setq gnus-message-archive-group "MisK") @end lisp Saving to two groups, @samp{MisK} and @samp{safe}: @lisp (setq gnus-message-archive-group '("MisK" "safe")) @end lisp Save to different groups based on what group you are in: @lisp (setq gnus-message-archive-group '(("^alt" "sent-to-alt") ("mail" "sent-to-mail") (".*" "sent-to-misc"))) @end lisp More complex stuff: @lisp (setq gnus-message-archive-group '((if (message-news-p) "misc-news" "misc-mail"))) @end lisp How about storing all news messages in one file, but storing all mail messages in one file per month: @lisp (setq gnus-message-archive-group '((if (message-news-p) "misc-news" (concat "mail." (format-time-string "%Y-%m"))))) @end lisp @c (XEmacs 19.13 doesn't have @code{format-time-string}, so you'll have to @c use a different value for @code{gnus-message-archive-group} there.) Now, when you send a message off, it will be stored in the appropriate group. (If you want to disable storing for just one particular message, you can just remove the @code{Gcc} header that has been inserted.) The archive group will appear in the group buffer the next time you start Gnus, or the next time you press @kbd{F} in the group buffer. You can enter it and read the articles in it just like you'd read any other group. If the group gets really big and annoying, you can simply rename if (using @kbd{G r} in the group buffer) to something nice---@samp{misc-mail-september-1995}, or whatever. New messages will continue to be stored in the old (now empty) group. That's the default method of archiving sent messages. Gnus offers a different way for the people who don't like the default method. In that case you should set @code{gnus-message-archive-group} to @code{nil}; this will disable archiving. @table @code @item gnus-outgoing-message-group @vindex gnus-outgoing-message-group All outgoing messages will be put in this group. If you want to store all your outgoing mail and articles in the group @samp{nnml:archive}, you set this variable to that value. This variable can also be a list of group names. If you want to have greater control over what group to put each message in, you can set this variable to a function that checks the current newsgroup name and then returns a suitable group name (or list of names). This variable can be used instead of @code{gnus-message-archive-group}, but the latter is the preferred method. @item gnus-gcc-mark-as-read @vindex gnus-gcc-mark-as-read If non-@code{nil}, automatically mark @code{Gcc} articles as read. @item gnus-gcc-externalize-attachments @vindex gnus-gcc-externalize-attachments If @code{nil}, attach files as normal parts in Gcc copies; if a regexp and matches the Gcc group name, attach files as external parts; if it is @code{all}, attach local files as external parts; if it is other non-@code{nil}, the behavior is the same as @code{all}, but it may be changed in the future. @end table @node Posting Styles @section Posting Styles @cindex posting styles @cindex styles All them variables, they make my head swim. So what if you want a different @code{Organization} and signature based on what groups you post to? And you post both from your home machine and your work machine, and you want different @code{From} lines, and so on? @vindex gnus-posting-styles One way to do stuff like that is to write clever hooks that change the variables you need to have changed. That's a bit boring, so somebody came up with the bright idea of letting the user specify these things in a handy alist. Here's an example of a @code{gnus-posting-styles} variable: @lisp ((".*" (signature "Peace and happiness") (organization "What me?")) ("^comp" (signature "Death to everybody")) ("comp.emacs.i-love-it" (organization "Emacs is it"))) @end lisp As you might surmise from this example, this alist consists of several @dfn{styles}. Each style will be applicable if the first element matches'', in some form or other. The entire alist will be iterated over, from the beginning towards the end, and each match will be applied, which means that attributes in later styles that match override the same attributes in earlier matching styles. So @samp{comp.programming.literate} will have the @samp{Death to everybody} signature and the @samp{What me?} @code{Organization} header. The first element in each style is called the @code{match}. If it's a string, then Gnus will try to regexp match it against the group name. If it is the form @code{(header @var{match} @var{regexp})}, then Gnus will look in the original article for a header whose name is @var{match} and compare that @var{regexp}. @var{match} and @var{regexp} are strings. (The original article is the one you are replying or following up to. If you are not composing a reply or a followup, then there is nothing to match against.) If the @code{match} is a function symbol, that function will be called with no arguments. If it's a variable symbol, then the variable will be referenced. If it's a list, then that list will be @code{eval}ed. In any case, if this returns a non-@code{nil} value, then the style is said to @dfn{match}. Each style may contain an arbitrary amount of @dfn{attributes}. Each attribute consists of a @code{(@var{name} @var{value})} pair. In addition, you can also use the @code{(@var{name} :file @var{value})} form or the @code{(@var{name} :value @var{value})} form. Where @code{:file} signifies @var{value} represents a file name and its contents should be used as the attribute value, @code{:value} signifies @var{value} does not represent a file name explicitly. The attribute name can be one of: @itemize @bullet @item @code{signature} @item @code{signature-file} @item @code{x-face-file} @item @code{address}, overriding @code{user-mail-address} @item @code{name}, overriding @code{(user-full-name)} @item @code{body} @end itemize The attribute name can also be a string or a symbol. In that case, this will be used as a header name, and the value will be inserted in the headers of the article; if the value is @code{nil}, the header name will be removed. If the attribute name is @code{eval}, the form is evaluated, and the result is thrown away. The attribute value can be a string (used verbatim), a function with zero arguments (the return value will be used), a variable (its value will be used) or a list (it will be @code{eval}ed and the return value will be used). The functions and sexps are called/@code{eval}ed in the message buffer that is being set up. The headers of the current article are available through the @code{message-reply-headers} variable, which is a vector of the following headers: number subject from date id references chars lines xref extra. @vindex message-reply-headers If you wish to check whether the message you are about to compose is meant to be a news article or a mail message, you can check the values of the @code{message-news-p} and @code{message-mail-p} functions. @findex message-mail-p @findex message-news-p So here's a new example: @lisp (setq gnus-posting-styles '((".*" (signature-file "~/.signature") (name "User Name") (x-face-file "~/.xface") (x-url (getenv "WWW_HOME")) (organization "People's Front Against MWM")) ("^rec.humor" (signature my-funny-signature-randomizer)) ((equal (system-name) "gnarly") ;; @r{A form} (signature my-quote-randomizer)) (message-news-p ;; @r{A function symbol} (signature my-news-signature)) (window-system ;; @r{A value symbol} ("X-Window-System" (format "%s" window-system))) ;; @r{If I'm replying to Larsi, set the Organization header.} ((header "from" "larsi.*org") (Organization "Somewhere, Inc.")) ((posting-from-work-p) ;; @r{A user defined function} (signature-file "~/.work-signature") (address "user@@bar.foo") (body "You are fired.\n\nSincerely, your boss.") (organization "Important Work, Inc")) ("nnml:.*" (From (save-excursion (set-buffer gnus-article-buffer) (message-fetch-field "to")))) ("^nn.+:" (signature-file "~/.mail-signature")))) @end lisp The @samp{nnml:.*} rule means that you use the @code{To} address as the @code{From} address in all your outgoing replies, which might be handy if you fill many roles. You may also use @code{message-alternative-emails} instead. @xref{Message Headers, ,Message Headers, message, Message Manual}. @node Drafts @section Drafts @cindex drafts If you are writing a message (mail or news) and suddenly remember that you have a steak in the oven (or some pesto in the food processor, you craaazy vegetarians), you'll probably wish there was a method to save the message you are writing so that you can continue editing it some other day, and send it when you feel its finished. Well, don't worry about it. Whenever you start composing a message of some sort using the Gnus mail and post commands, the buffer you get will automatically associate to an article in a special @dfn{draft} group. If you save the buffer the normal way (@kbd{C-x C-s}, for instance), the article will be saved there. (Auto-save files also go to the draft group.) @cindex nndraft @vindex nndraft-directory The draft group is a special group (which is implemented as an @code{nndraft} group, if you absolutely have to know) called @samp{nndraft:drafts}. The variable @code{nndraft-directory} says where @code{nndraft} is to store its files. What makes this group special is that you can't tick any articles in it or mark any articles as read---all articles in the group are permanently unread. If the group doesn't exist, it will be created and you'll be subscribed to it. The only way to make it disappear from the Group buffer is to unsubscribe it. The special properties of the draft group comes from a group property (@pxref{Group Parameters}), and if lost the group behaves like any other group. This means the commands below will not be available. To restore the special properties of the group, the simplest way is to kill the group, using @kbd{C-k}, and restart Gnus. The group is automatically created again with the correct parameters. The content of the group is not lost. @c @findex gnus-dissociate-buffer-from-draft @c @kindex C-c M-d (Mail) @c @kindex C-c M-d (Post) @c @findex gnus-associate-buffer-with-draft @c @kindex C-c C-d (Mail) @c @kindex C-c C-d (Post) @c If you're writing some super-secret message that you later want to @c encode with PGP before sending, you may wish to turn the auto-saving @c (and association with the draft group) off. You never know who might be @c interested in reading all your extremely valuable and terribly horrible @c and interesting secrets. The @kbd{C-c M-d} @c (@code{gnus-dissociate-buffer-from-draft}) command does that for you. @c If you change your mind and want to turn the auto-saving back on again, @c @kbd{C-c C-d} (@code{gnus-associate-buffer-with-draft} does that. @c @c @vindex gnus-use-draft @c To leave association with the draft group off by default, set @c @code{gnus-use-draft} to @code{nil}. It is @code{t} by default. @findex gnus-draft-edit-message @kindex D e (Draft) When you want to continue editing the article, you simply enter the draft group and push @kbd{D e} (@code{gnus-draft-edit-message}) to do that. You will be placed in a buffer where you left off. Rejected articles will also be put in this draft group (@pxref{Rejected Articles}). @findex gnus-draft-send-all-messages @kindex D s (Draft) @findex gnus-draft-send-message @kindex D S (Draft) If you have lots of rejected messages you want to post (or mail) without doing further editing, you can use the @kbd{D s} command (@code{gnus-draft-send-message}). This command understands the process/prefix convention (@pxref{Process/Prefix}). The @kbd{D S} command (@code{gnus-draft-send-all-messages}) will ship off all messages in the buffer. @findex gnus-draft-toggle-sending @kindex D t (Draft) If you have some messages that you wish not to send, you can use the @kbd{D t} (@code{gnus-draft-toggle-sending}) command to mark the message as unsendable. This is a toggling command. @node Rejected Articles @section Rejected Articles @cindex rejected articles Sometimes a news server will reject an article. Perhaps the server doesn't like your face. Perhaps it just feels miserable. Perhaps @emph{there be demons}. Perhaps you have included too much cited text. Perhaps the disk is full. Perhaps the server is down. These situations are, of course, totally beyond the control of Gnus. (Gnus, of course, loves the way you look, always feels great, has angels fluttering around inside of it, doesn't care about how much cited text you include, never runs full and never goes down.) So Gnus saves these articles until some later time when the server feels better. The rejected articles will automatically be put in a special draft group (@pxref{Drafts}). When the server comes back up again, you'd then typically enter that group and send all the articles off. @node Signing and encrypting @section Signing and encrypting @cindex using gpg @cindex using s/mime @cindex using smime Gnus can digitally sign and encrypt your messages, using vanilla @acronym{PGP} format or @acronym{PGP/MIME} or @acronym{S/MIME}. For decoding such messages, see the @code{mm-verify-option} and @code{mm-decrypt-option} options (@pxref{Security}). @vindex gnus-message-replysign @vindex gnus-message-replyencrypt @vindex gnus-message-replysignencrypted Often, you would like to sign replies to people who send you signed messages. Even more often, you might want to encrypt messages which are in reply to encrypted messages. Gnus offers @code{gnus-message-replysign} to enable the former, and @code{gnus-message-replyencrypt} for the latter. In addition, setting @code{gnus-message-replysignencrypted} (on by default) will sign automatically encrypted messages. Instructing @acronym{MML} to perform security operations on a @acronym{MIME} part is done using the @kbd{C-c C-m s} key map for signing and the @kbd{C-c C-m c} key map for encryption, as follows. @table @kbd @item C-c C-m s s @kindex C-c C-m s s (Message) @findex mml-secure-message-sign-smime Digitally sign current message using @acronym{S/MIME}. @item C-c C-m s o @kindex C-c C-m s o (Message) @findex mml-secure-message-sign-pgp Digitally sign current message using @acronym{PGP}. @item C-c C-m s p @kindex C-c C-m s p (Message) @findex mml-secure-message-sign-pgp Digitally sign current message using @acronym{PGP/MIME}. @item C-c C-m c s @kindex C-c C-m c s (Message) @findex mml-secure-message-encrypt-smime Digitally encrypt current message using @acronym{S/MIME}. @item C-c C-m c o @kindex C-c C-m c o (Message) @findex mml-secure-message-encrypt-pgp Digitally encrypt current message using @acronym{PGP}. @item C-c C-m c p @kindex C-c C-m c p (Message) @findex mml-secure-message-encrypt-pgpmime Digitally encrypt current message using @acronym{PGP/MIME}. @item C-c C-m C-n @kindex C-c C-m C-n (Message) @findex mml-unsecure-message Remove security related @acronym{MML} tags from message. @end table @xref{Security, ,Security, message, Message Manual}, for more information. @node Select Methods @chapter Select Methods @cindex foreign groups @cindex select methods A @dfn{foreign group} is a group not read by the usual (or default) means. It could be, for instance, a group from a different @acronym{NNTP} server, it could be a virtual group, or it could be your own personal mail group. A foreign group (or any group, really) is specified by a @dfn{name} and a @dfn{select method}. To take the latter first, a select method is a list where the first element says what back end to use (e.g. @code{nntp}, @code{nnspool}, @code{nnml}) and the second element is the @dfn{server name}. There may be additional elements in the select method, where the value may have special meaning for the back end in question. One could say that a select method defines a @dfn{virtual server}---so we do just that (@pxref{Server Buffer}). The @dfn{name} of the group is the name the back end will recognize the group as. For instance, the group @samp{soc.motss} on the @acronym{NNTP} server @samp{some.where.edu} will have the name @samp{soc.motss} and select method @code{(nntp "some.where.edu")}. Gnus will call this group @samp{nntp+some.where.edu:soc.motss}, even though the @code{nntp} back end just knows this group as @samp{soc.motss}. The different methods all have their peculiarities, of course. @menu * Server Buffer:: Making and editing virtual servers. * Getting News:: Reading USENET news with Gnus. * Getting Mail:: Reading your personal mail with Gnus. * Browsing the Web:: Getting messages from a plethora of Web sources. * IMAP:: Using Gnus as a @acronym{IMAP} client. * Other Sources:: Reading directories, files, SOUP packets. * Combined Groups:: Combining groups into one group. * Email Based Diary:: Using mails to manage diary events in Gnus. * Gnus Unplugged:: Reading news and mail offline. @end menu @node Server Buffer @section Server Buffer Traditionally, a @dfn{server} is a machine or a piece of software that one connects to, and then requests information from. Gnus does not connect directly to any real servers, but does all transactions through one back end or other. But that's just putting one layer more between the actual media and Gnus, so we might just as well say that each back end represents a virtual server. For instance, the @code{nntp} back end may be used to connect to several different actual @acronym{NNTP} servers, or, perhaps, to many different ports on the same actual @acronym{NNTP} server. You tell Gnus which back end to use, and what parameters to set by specifying a @dfn{select method}. These select method specifications can sometimes become quite complicated---say, for instance, that you want to read from the @acronym{NNTP} server @samp{news.funet.fi} on port number 13, which hangs if queried for @acronym{NOV} headers and has a buggy select. Ahem. Anyway, if you had to specify that for each group that used this server, that would be too much work, so Gnus offers a way of naming select methods, which is what you do in the server buffer. To enter the server buffer, use the @kbd{^} (@code{gnus-group-enter-server-mode}) command in the group buffer. @menu * Server Buffer Format:: You can customize the look of this buffer. * Server Commands:: Commands to manipulate servers. * Example Methods:: Examples server specifications. * Creating a Virtual Server:: An example session. * Server Variables:: Which variables to set. * Servers and Methods:: You can use server names as select methods. * Unavailable Servers:: Some servers you try to contact may be down. @end menu @vindex gnus-server-mode-hook @code{gnus-server-mode-hook} is run when creating the server buffer. @node Server Buffer Format @subsection Server Buffer Format @cindex server buffer format @vindex gnus-server-line-format You can change the look of the server buffer lines by changing the @code{gnus-server-line-format} variable. This is a @code{format}-like variable, with some simple extensions: @table @samp @item h How the news is fetched---the back end name. @item n The name of this server. @item w Where the news is to be fetched from---the address. @item s The opened/closed/denied status of the server. @item a Whether this server is agentized. @end table @vindex gnus-server-mode-line-format The mode line can also be customized by using the @code{gnus-server-mode-line-format} variable (@pxref{Mode Line Formatting}). The following specs are understood: @table @samp @item S Server name. @item M Server method. @end table Also @pxref{Formatting Variables}. @node Server Commands @subsection Server Commands @cindex server commands @table @kbd @item v @kindex v (Server) @cindex keys, reserved for users (Server) The key @kbd{v} is reserved for users. You can bind it key to some function or better use it as a prefix key. @item a @kindex a (Server) @findex gnus-server-add-server Add a new server (@code{gnus-server-add-server}). @item e @kindex e (Server) @findex gnus-server-edit-server Edit a server (@code{gnus-server-edit-server}). @item SPACE @kindex SPACE (Server) @findex gnus-server-read-server Browse the current server (@code{gnus-server-read-server}). @item q @kindex q (Server) @findex gnus-server-exit Return to the group buffer (@code{gnus-server-exit}). @item k @kindex k (Server) @findex gnus-server-kill-server Kill the current server (@code{gnus-server-kill-server}). @item y @kindex y (Server) @findex gnus-server-yank-server Yank the previously killed server (@code{gnus-server-yank-server}). @item c @kindex c (Server) @findex gnus-server-copy-server Copy the current server (@code{gnus-server-copy-server}). @item l @kindex l (Server) @findex gnus-server-list-servers List all servers (@code{gnus-server-list-servers}). @item s @kindex s (Server) @findex gnus-server-scan-server Request that the server scan its sources for new articles (@code{gnus-server-scan-server}). This is mainly sensible with mail servers. @item g @kindex g (Server) @findex gnus-server-regenerate-server Request that the server regenerate all its data structures (@code{gnus-server-regenerate-server}). This can be useful if you have a mail back end that has gotten out of sync. @end table @node Example Methods @subsection Example Methods Most select methods are pretty simple and self-explanatory: @lisp (nntp "news.funet.fi") @end lisp Reading directly from the spool is even simpler: @lisp (nnspool "") @end lisp As you can see, the first element in a select method is the name of the back end, and the second is the @dfn{address}, or @dfn{name}, if you will. After these two elements, there may be an arbitrary number of @code{(@var{variable} @var{form})} pairs. To go back to the first example---imagine that you want to read from port 15 on that machine. This is what the select method should look like then: @lisp (nntp "news.funet.fi" (nntp-port-number 15)) @end lisp You should read the documentation to each back end to find out what variables are relevant, but here's an @code{nnmh} example: @code{nnmh} is a mail back end that reads a spool-like structure. Say you have two structures that you wish to access: One is your private mail spool, and the other is a public one. Here's the possible spec for your private mail: @lisp (nnmh "private" (nnmh-directory "~/private/mail/")) @end lisp (This server is then called @samp{private}, but you may have guessed that.) Here's the method for a public spool: @lisp (nnmh "public" (nnmh-directory "/usr/information/spool/") (nnmh-get-new-mail nil)) @end lisp @cindex proxy @cindex firewall If you are behind a firewall and only have access to the @acronym{NNTP} server from the firewall machine, you can instruct Gnus to @code{rlogin} on the firewall machine and telnet from there to the @acronym{NNTP} server. Doing this can be rather fiddly, but your virtual server definition should probably look something like this: @lisp (nntp "firewall" (nntp-open-connection-function nntp-open-via-rlogin-and-telnet) (nntp-via-address "the.firewall.machine") (nntp-address "the.real.nntp.host") (nntp-end-of-line "\n")) @end lisp If you want to use the wonderful @code{ssh} program to provide a compressed connection over the modem line, you could add the following configuration to the example above: @lisp (nntp-via-rlogin-command "ssh") @end lisp See also @code{nntp-via-rlogin-command-switches}. If you're behind a firewall, but have direct access to the outside world through a wrapper command like "runsocks", you could open a socksified telnet connection to the news server as follows: @lisp (nntp "outside" (nntp-pre-command "runsocks") (nntp-open-connection-function nntp-open-via-telnet) (nntp-address "the.news.server") (nntp-end-of-line "\n")) @end lisp This means that you have to have set up @code{ssh-agent} correctly to provide automatic authorization, of course. And to get a compressed connection, you have to have the @samp{Compression} option in the @code{ssh} @file{config} file. @node Creating a Virtual Server @subsection Creating a Virtual Server If you're saving lots of articles in the cache by using persistent articles, you may want to create a virtual server to read the cache. First you need to add a new server. The @kbd{a} command does that. It would probably be best to use @code{nnml} to read the cache. You could also use @code{nnspool} or @code{nnmh}, though. Type @kbd{a nnml RET cache RET}. You should now have a brand new @code{nnml} virtual server called @samp{cache}. You now need to edit it to have the right definitions. Type @kbd{e} to edit the server. You'll be entered into a buffer that will contain the following: @lisp (nnml "cache") @end lisp Change that to: @lisp (nnml "cache" (nnml-directory "~/News/cache/") (nnml-active-file "~/News/cache/active")) @end lisp Type @kbd{C-c C-c} to return to the server buffer. If you now press @kbd{RET} over this virtual server, you should be entered into a browse buffer, and you should be able to enter any of the groups displayed. @node Server Variables @subsection Server Variables @cindex server variables @cindex server parameters One sticky point when defining variables (both on back ends and in Emacs in general) is that some variables are typically initialized from other variables when the definition of the variables is being loaded. If you change the base'' variable after the variables have been loaded, you won't change the derived'' variables. This typically affects directory and file variables. For instance, @code{nnml-directory} is @file{~/Mail/} by default, and all @code{nnml} directory variables are initialized from that variable, so @code{nnml-active-file} will be @file{~/Mail/active}. If you define a new virtual @code{nnml} server, it will @emph{not} suffice to set just @code{nnml-directory}---you have to explicitly set all the file variables to be what you want them to be. For a complete list of variables for each back end, see each back end's section later in this manual, but here's an example @code{nnml} definition: @lisp (nnml "public" (nnml-directory "~/my-mail/") (nnml-active-file "~/my-mail/active") (nnml-newsgroups-file "~/my-mail/newsgroups")) @end lisp Server variables are often called @dfn{server parameters}. @node Servers and Methods @subsection Servers and Methods Wherever you would normally use a select method (e.g. @code{gnus-secondary-select-method}, in the group select method, when browsing a foreign server) you can use a virtual server name instead. This could potentially save lots of typing. And it's nice all over. @node Unavailable Servers @subsection Unavailable Servers If a server seems to be unreachable, Gnus will mark that server as @code{denied}. That means that any subsequent attempt to make contact with that server will just be ignored. It can't be opened,'' Gnus will tell you, without making the least effort to see whether that is actually the case or not. That might seem quite naughty, but it does make sense most of the time. Let's say you have 10 groups subscribed to on server @samp{nephelococcygia.com}. This server is located somewhere quite far away from you and the machine is quite slow, so it takes 1 minute just to find out that it refuses connection to you today. If Gnus were to attempt to do that 10 times, you'd be quite annoyed, so Gnus won't attempt to do that. Once it has gotten a single connection refused'', it will regard that server as down''. So, what happens if the machine was only feeling unwell temporarily? How do you test to see whether the machine has come up again? You jump to the server buffer (@pxref{Server Buffer}) and poke it with the following commands: @table @kbd @item O @kindex O (Server) @findex gnus-server-open-server Try to establish connection to the server on the current line (@code{gnus-server-open-server}). @item C @kindex C (Server) @findex gnus-server-close-server Close the connection (if any) to the server (@code{gnus-server-close-server}). @item D @kindex D (Server) @findex gnus-server-deny-server Mark the current server as unreachable (@code{gnus-server-deny-server}). @item M-o @kindex M-o (Server) @findex gnus-server-open-all-servers Open the connections to all servers in the buffer (@code{gnus-server-open-all-servers}). @item M-c @kindex M-c (Server) @findex gnus-server-close-all-servers Close the connections to all servers in the buffer (@code{gnus-server-close-all-servers}). @item R @kindex R (Server) @findex gnus-server-remove-denials Remove all marks to whether Gnus was denied connection from any servers (@code{gnus-server-remove-denials}). @item L @kindex L (Server) @findex gnus-server-offline-server Set server status to offline (@code{gnus-server-offline-server}). @end table @node Getting News @section Getting News @cindex reading news @cindex news back ends A newsreader is normally used for reading news. Gnus currently provides only two methods of getting news---it can read from an @acronym{NNTP} server, or it can read from a local spool. @menu * NNTP:: Reading news from an @acronym{NNTP} server. * News Spool:: Reading news from the local spool. @end menu @node NNTP @subsection NNTP @cindex nntp Subscribing to a foreign group from an @acronym{NNTP} server is rather easy. You just specify @code{nntp} as method and the address of the @acronym{NNTP} server as the, uhm, address. If the @acronym{NNTP} server is located at a non-standard port, setting the third element of the select method to this port number should allow you to connect to the right port. You'll have to edit the group info for that (@pxref{Foreign Groups}). The name of the foreign group can be the same as a native group. In fact, you can subscribe to the same group from as many different servers you feel like. There will be no name collisions. The following variables can be used to create a virtual @code{nntp} server: @table @code @item nntp-server-opened-hook @vindex nntp-server-opened-hook @cindex @sc{mode reader} @cindex authinfo @cindex authentication @cindex nntp authentication @findex nntp-send-authinfo @findex nntp-send-mode-reader is run after a connection has been made. It can be used to send commands to the @acronym{NNTP} server after it has been contacted. By default it sends the command @code{MODE READER} to the server with the @code{nntp-send-mode-reader} function. This function should always be present in this hook. @item nntp-authinfo-function @vindex nntp-authinfo-function @findex nntp-send-authinfo @vindex nntp-authinfo-file This function will be used to send @samp{AUTHINFO} to the @acronym{NNTP} server. The default function is @code{nntp-send-authinfo}, which looks through your @file{~/.authinfo} (or whatever you've set the @code{nntp-authinfo-file} variable to) for applicable entries. If none are found, it will prompt you for a login name and a password. The format of the @file{~/.authinfo} file is (almost) the same as the @code{ftp} @file{~/.netrc} file, which is defined in the @code{ftp} manual page, but here are the salient facts: @enumerate @item The file contains one or more line, each of which define one server. @item Each line may contain an arbitrary number of token/value pairs. The valid tokens include @samp{machine}, @samp{login}, @samp{password}, @samp{default}. In addition Gnus introduces two new tokens, not present in the original @file{.netrc}/@code{ftp} syntax, namely @samp{port} and @samp{force}. (This is the only way the @file{.authinfo} file format deviates from the @file{.netrc} file format.) @samp{port} is used to indicate what port on the server the credentials apply to and @samp{force} is explained below. @end enumerate Here's an example file: @example machine news.uio.no login larsi password geheimnis machine nntp.ifi.uio.no login larsi force yes @end example The token/value pairs may appear in any order; @samp{machine} doesn't have to be first, for instance. In this example, both login name and password have been supplied for the former server, while the latter has only the login name listed, and the user will be prompted for the password. The latter also has the @samp{force} tag, which means that the authinfo will be sent to the @var{nntp} server upon connection; the default (i.e., when there is not @samp{force} tag) is to not send authinfo to the @var{nntp} server until the @var{nntp} server asks for it. You can also add @samp{default} lines that will apply to all servers that don't have matching @samp{machine} lines. @example default force yes @end example This will force sending @samp{AUTHINFO} commands to all servers not previously mentioned. Remember to not leave the @file{~/.authinfo} file world-readable. @item nntp-server-action-alist @vindex nntp-server-action-alist This is a list of regexps to match on server types and actions to be taken when matches are made. For instance, if you want Gnus to beep every time you connect to innd, you could say something like: @lisp (setq nntp-server-action-alist '(("innd" (ding)))) @end lisp You probably don't want to do that, though. The default value is @lisp '(("nntpd 1\\.5\\.11t" (remove-hook 'nntp-server-opened-hook 'nntp-send-mode-reader))) @end lisp This ensures that Gnus doesn't send the @code{MODE READER} command to nntpd 1.5.11t, since that command chokes that server, I've been told. @item nntp-maximum-request @vindex nntp-maximum-request If the @acronym{NNTP} server doesn't support @acronym{NOV} headers, this back end will collect headers by sending a series of @code{head} commands. To speed things up, the back end sends lots of these commands without waiting for reply, and then reads all the replies. This is controlled by the @code{nntp-maximum-request} variable, and is 400 by default. If your network is buggy, you should set this to 1. @item nntp-connection-timeout @vindex nntp-connection-timeout If you have lots of foreign @code{nntp} groups that you connect to regularly, you're sure to have problems with @acronym{NNTP} servers not responding properly, or being too loaded to reply within reasonable time. This is can lead to awkward problems, which can be helped somewhat by setting @code{nntp-connection-timeout}. This is an integer that says how many seconds the @code{nntp} back end should wait for a connection before giving up. If it is @code{nil}, which is the default, no timeouts are done. @item nntp-nov-is-evil @vindex nntp-nov-is-evil If the @acronym{NNTP} server does not support @acronym{NOV}, you could set this variable to @code{t}, but @code{nntp} usually checks automatically whether @acronym{NOV} can be used. @item nntp-xover-commands @vindex nntp-xover-commands @cindex @acronym{NOV} @cindex XOVER List of strings used as commands to fetch @acronym{NOV} lines from a server. The default value of this variable is @code{("XOVER" "XOVERVIEW")}. @item nntp-nov-gap @vindex nntp-nov-gap @code{nntp} normally sends just one big request for @acronym{NOV} lines to the server. The server responds with one huge list of lines. However, if you have read articles 2-5000 in the group, and only want to read article 1 and 5001, that means that @code{nntp} will fetch 4999 @acronym{NOV} lines that you will not need. This variable says how big a gap between two consecutive articles is allowed to be before the @code{XOVER} request is split into several request. Note that if your network is fast, setting this variable to a really small number means that fetching will probably be slower. If this variable is @code{nil}, @code{nntp} will never split requests. The default is 5. @item nntp-prepare-server-hook @vindex nntp-prepare-server-hook A hook run before attempting to connect to an @acronym{NNTP} server. @item nntp-record-commands @vindex nntp-record-commands If non-@code{nil}, @code{nntp} will log all commands it sends to the @acronym{NNTP} server (along with a timestamp) in the @samp{*nntp-log*} buffer. This is useful if you are debugging a Gnus/@acronym{NNTP} connection that doesn't seem to work. @item nntp-open-connection-function @vindex nntp-open-connection-function It is possible to customize how the connection to the nntp server will be opened. If you specify an @code{nntp-open-connection-function} parameter, Gnus will use that function to establish the connection. Six pre-made functions are supplied. These functions can be grouped in two categories: direct connection functions (four pre-made), and indirect ones (two pre-made). @item nntp-never-echoes-commands @vindex nntp-never-echoes-commands Non-@code{nil} means the nntp server never echoes commands. It is reported that some nntps server doesn't echo commands. So, you may want to set this to non-@code{nil} in the method for such a server setting @code{nntp-open-connection-function} to @code{nntp-open-ssl-stream} for example. The default value is @code{nil}. Note that the @code{nntp-open-connection-functions-never-echo-commands} variable overrides the @code{nil} value of this variable. @item nntp-open-connection-functions-never-echo-commands @vindex nntp-open-connection-functions-never-echo-commands List of functions that never echo commands. Add or set a function which you set to @code{nntp-open-connection-function} to this list if it does not echo commands. Note that a non-@code{nil} value of the @code{nntp-never-echoes-commands} variable overrides this variable. The default value is @code{(nntp-open-network-stream)}. @item nntp-prepare-post-hook @vindex nntp-prepare-post-hook A hook run just before posting an article. If there is no @code{Message-ID} header in the article and the news server provides the recommended ID, it will be added to the article before running this hook. It is useful to make @code{Cancel-Lock} headers even if you inhibit Gnus to add a @code{Message-ID} header, you could say: @lisp (add-hook 'nntp-prepare-post-hook 'canlock-insert-header) @end lisp Note that not all servers support the recommended ID. This works for INN versions 2.3.0 and later, for instance. @end table @menu * Direct Functions:: Connecting directly to the server. * Indirect Functions:: Connecting indirectly to the server. * Common Variables:: Understood by several connection functions. @end menu @node Direct Functions @subsubsection Direct Functions @cindex direct connection functions These functions are called direct because they open a direct connection between your machine and the @acronym{NNTP} server. The behavior of these functions is also affected by commonly understood variables (@pxref{Common Variables}). @table @code @findex nntp-open-network-stream @item nntp-open-network-stream This is the default, and simply connects to some port or other on the remote system. @findex nntp-open-tls-stream @item nntp-open-tls-stream Opens a connection to a server over a @dfn{secure} channel. To use this you must have @uref{http://www.gnu.org/software/gnutls/, GNUTLS} installed. You then define a server as follows: @lisp ;; @r{"nntps" is port 563 and is predefined in our @file{/etc/services}} ;; @r{however, @samp{gnutls-cli -p} doesn't like named ports.} ;; (nntp "snews.bar.com" (nntp-open-connection-function nntp-open-tls-stream) (nntp-port-number ) (nntp-address "snews.bar.com")) @end lisp @findex nntp-open-ssl-stream @item nntp-open-ssl-stream Opens a connection to a server over a @dfn{secure} channel. To use this you must have @uref{http://www.openssl.org, OpenSSL} or @uref{ftp://ftp.psy.uq.oz.au/pub/Crypto/SSL, SSLeay} installed. You then define a server as follows: @lisp ;; @r{"snews" is port 563 and is predefined in our @file{/etc/services}} ;; @r{however, @samp{openssl s_client -port} doesn't like named ports.} ;; (nntp "snews.bar.com" (nntp-open-connection-function nntp-open-ssl-stream) (nntp-port-number 563) (nntp-address "snews.bar.com")) @end lisp @findex nntp-open-telnet-stream @item nntp-open-telnet-stream Opens a connection to an @acronym{NNTP} server by simply @samp{telnet}'ing it. You might wonder why this function exists, since we have the default @code{nntp-open-network-stream} which would do the job. (One of) the reason(s) is that if you are behind a firewall but have direct connections to the outside world thanks to a command wrapper like @code{runsocks}, you can use it like this: @lisp (nntp "socksified" (nntp-pre-command "runsocks") (nntp-open-connection-function nntp-open-telnet-stream) (nntp-address "the.news.server")) @end lisp With the default method, you would need to wrap your whole Emacs session, which is not a good idea. @end table @node Indirect Functions @subsubsection Indirect Functions @cindex indirect connection functions These functions are called indirect because they connect to an intermediate host before actually connecting to the @acronym{NNTP} server. All of these functions and related variables are also said to belong to the via'' family of connection: they're all prefixed with via'' to make things cleaner. The behavior of these functions is also affected by commonly understood variables (@pxref{Common Variables}). @table @code @item nntp-open-via-rlogin-and-telnet @findex nntp-open-via-rlogin-and-telnet Does an @samp{rlogin} on a remote system, and then does a @samp{telnet} to the real @acronym{NNTP} server from there. This is useful for instance if you need to connect to a firewall machine first. @code{nntp-open-via-rlogin-and-telnet}-specific variables: @table @code @item nntp-via-rlogin-command @vindex nntp-via-rlogin-command Command used to log in on the intermediate host. The default is @samp{rsh}, but @samp{ssh} is a popular alternative. @item nntp-via-rlogin-command-switches @vindex nntp-via-rlogin-command-switches List of strings to be used as the switches to @code{nntp-via-rlogin-command}. The default is @code{nil}. If you use @samp{ssh} for @code{nntp-via-rlogin-command}, you may set this to @samp{("-C")} in order to compress all data connections, otherwise set this to @samp{("-t" "-e" "none")} or @samp{("-C" "-t" "-e" "none")} if the telnet command requires a pseudo-tty allocation on an intermediate host. @end table @item nntp-open-via-telnet-and-telnet @findex nntp-open-via-telnet-and-telnet Does essentially the same, but uses @samp{telnet} instead of @samp{rlogin} to connect to the intermediate host. @code{nntp-open-via-telnet-and-telnet}-specific variables: @table @code @item nntp-via-telnet-command @vindex nntp-via-telnet-command Command used to @code{telnet} the intermediate host. The default is @samp{telnet}. @item nntp-via-telnet-switches @vindex nntp-via-telnet-switches List of strings to be used as the switches to the @code{nntp-via-telnet-command} command. The default is @samp{("-8")}. @item nntp-via-user-password @vindex nntp-via-user-password Password to use when logging in on the intermediate host. @item nntp-via-envuser @vindex nntp-via-envuser If non-@code{nil}, the intermediate @code{telnet} session (client and server both) will support the @code{ENVIRON} option and not prompt for login name. This works for Solaris @code{telnet}, for instance. @item nntp-via-shell-prompt @vindex nntp-via-shell-prompt Regexp matching the shell prompt on the intermediate host. The default is @samp{bash\\|\ *\r?\\|> *\r?}. @end table @end table Here are some additional variables that are understood by all the above functions: @table @code @item nntp-via-user-name @vindex nntp-via-user-name User name to use when connecting to the intermediate host. @item nntp-via-address @vindex nntp-via-address Address of the intermediate host to connect to. @end table @node Common Variables @subsubsection Common Variables The following variables affect the behavior of all, or several of the pre-made connection functions. When not specified, all functions are affected (the values of the following variables will be used as the default if each virtual @code{nntp} server doesn't specify those server variables individually). @table @code @item nntp-pre-command @vindex nntp-pre-command A command wrapper to use when connecting through a non native connection function (all except @code{nntp-open-network-stream}, @code{nntp-open-tls-stream}, and @code{nntp-open-ssl-stream}). This is where you would put a @samp{SOCKS} wrapper for instance. @item nntp-address @vindex nntp-address The address of the @acronym{NNTP} server. @item nntp-port-number @vindex nntp-port-number Port number to connect to the @acronym{NNTP} server. The default is @samp{nntp}. If you use @acronym{NNTP} over @acronym{TLS}/@acronym{SSL}, you may want to use integer ports rather than named ports (i.e, use @samp{563} instead of @samp{snews} or @samp{nntps}), because external @acronym{TLS}/@acronym{SSL} tools may not work with named ports. @item nntp-end-of-line @vindex nntp-end-of-line String to use as end-of-line marker when talking to the @acronym{NNTP} server. This is @samp{\r\n} by default, but should be @samp{\n} when using a non native connection function. @item nntp-telnet-command @vindex nntp-telnet-command Command to use when connecting to the @acronym{NNTP} server through @samp{telnet}. This is @emph{not} for an intermediate host. This is just for the real @acronym{NNTP} server. The default is @samp{telnet}. @item nntp-telnet-switches @vindex nntp-telnet-switches A list of switches to pass to @code{nntp-telnet-command}. The default is @samp{("-8")}. @end table @node News Spool @subsection News Spool @cindex nnspool @cindex news spool Subscribing to a foreign group from the local spool is extremely easy, and might be useful, for instance, to speed up reading groups that contain very big articles---@samp{alt.binaries.pictures.furniture}, for instance. Anyway, you just specify @code{nnspool} as the method and @code{""} (or anything else) as the address. If you have access to a local spool, you should probably use that as the native select method (@pxref{Finding the News}). It is normally faster than using an @code{nntp} select method, but might not be. It depends. You just have to try to find out what's best at your site. @table @code @item nnspool-inews-program @vindex nnspool-inews-program Program used to post an article. @item nnspool-inews-switches @vindex nnspool-inews-switches Parameters given to the inews program when posting an article. @item nnspool-spool-directory @vindex nnspool-spool-directory Where @code{nnspool} looks for the articles. This is normally @file{/usr/spool/news/}. @item nnspool-nov-directory @vindex nnspool-nov-directory Where @code{nnspool} will look for @acronym{NOV} files. This is normally@* @file{/usr/spool/news/over.view/}. @item nnspool-lib-dir @vindex nnspool-lib-dir Where the news lib dir is (@file{/usr/lib/news/} by default). @item nnspool-active-file @vindex nnspool-active-file The name of the active file. @item nnspool-newsgroups-file @vindex nnspool-newsgroups-file The name of the group descriptions file. @item nnspool-history-file @vindex nnspool-history-file The name of the news history file. @item nnspool-active-times-file @vindex nnspool-active-times-file The name of the active date file. @item nnspool-nov-is-evil @vindex nnspool-nov-is-evil If non-@code{nil}, @code{nnspool} won't try to use any @acronym{NOV} files that it finds. @item nnspool-sift-nov-with-sed @vindex nnspool-sift-nov-with-sed @cindex sed If non-@code{nil}, which is the default, use @code{sed} to get the relevant portion from the overview file. If @code{nil}, @code{nnspool} will load the entire file into a buffer and process it there. @end table @node Getting Mail @section Getting Mail @cindex reading mail @cindex mail Reading mail with a newsreader---isn't that just plain WeIrD? But of course. @menu * Mail in a Newsreader:: Important introductory notes. * Getting Started Reading Mail:: A simple cookbook example. * Splitting Mail:: How to create mail groups. * Mail Sources:: How to tell Gnus where to get mail from. * Mail Back End Variables:: Variables for customizing mail handling. * Fancy Mail Splitting:: Gnus can do hairy splitting of incoming mail. * Group Mail Splitting:: Use group customize to drive mail splitting. * Incorporating Old Mail:: What about the old mail you have? * Expiring Mail:: Getting rid of unwanted mail. * Washing Mail:: Removing cruft from the mail you get. * Duplicates:: Dealing with duplicated mail. * Not Reading Mail:: Using mail back ends for reading other files. * Choosing a Mail Back End:: Gnus can read a variety of mail formats. @end menu @node Mail in a Newsreader @subsection Mail in a Newsreader If you are used to traditional mail readers, but have decided to switch to reading mail with Gnus, you may find yourself experiencing something of a culture shock. Gnus does not behave like traditional mail readers. If you want to make it behave that way, you can, but it's an uphill battle. Gnus, by default, handles all its groups using the same approach. This approach is very newsreaderly---you enter a group, see the new/unread messages, and when you read the messages, they get marked as read, and you don't see them any more. (Unless you explicitly ask for them.) In particular, you do not do anything explicitly to delete messages. Does this mean that all the messages that have been marked as read are deleted? How awful! But, no, it means that old messages are @dfn{expired} according to some scheme or other. For news messages, the expire process is controlled by the news administrator; for mail, the expire process is controlled by you. The expire process for mail is covered in depth in @ref{Expiring Mail}. What many Gnus users find, after using it a while for both news and mail, is that the transport mechanism has very little to do with how they want to treat a message. Many people subscribe to several mailing lists. These are transported via @acronym{SMTP}, and are therefore mail. But we might go for weeks without answering, or even reading these messages very carefully. We may not need to save them because if we should need to read one again, they are archived somewhere else. Some people have local news groups which have only a handful of readers. These are transported via @acronym{NNTP}, and are therefore news. But we may need to read and answer a large fraction of the messages very carefully in order to do our work. And there may not be an archive, so we may need to save the interesting messages the same way we would personal mail. The important distinction turns out to be not the transport mechanism, but other factors such as how interested we are in the subject matter, or how easy it is to retrieve the message if we need to read it again. Gnus provides many options for sorting mail into groups'' which behave like newsgroups, and for treating each group (whether mail or news) differently. Some users never get comfortable using the Gnus (ahem) paradigm and wish that Gnus should grow up and be a male, er, mail reader. It is possible to whip Gnus into a more mailreaderly being, but, as said before, it's not easy. People who prefer proper mail readers should try @sc{vm} instead, which is an excellent, and proper, mail reader. I don't mean to scare anybody off, but I want to make it clear that you may be required to learn a new way of thinking about messages. After you've been subjected to The Gnus Way, you will come to love it. I can guarantee it. (At least the guy who sold me the Emacs Subliminal Brain-Washing Functions that I've put into Gnus did guarantee it. You Will Be Assimilated. You Love Gnus. You Love The Gnus Mail Way. You Do.) @node Getting Started Reading Mail @subsection Getting Started Reading Mail It's quite easy to use Gnus to read your new mail. You just plonk the mail back end of your choice into @code{gnus-secondary-select-methods}, and things will happen automatically. For instance, if you want to use @code{nnml} (which is a one file per mail'' back end), you could put the following in your @file{~/.gnus.el} file: @lisp (setq gnus-secondary-select-methods '((nnml ""))) @end lisp Now, the next time you start Gnus, this back end will be queried for new articles, and it will move all the messages in your spool file to its directory, which is @file{~/Mail/} by default. The new group that will be created (@samp{mail.misc}) will be subscribed, and you can read it like any other group. You will probably want to split the mail into several groups, though: @lisp (setq nnmail-split-methods '(("junk" "^From:.*Lars Ingebrigtsen") ("crazy" "^Subject:.*die\\|^Organization:.*flabby") ("other" ""))) @end lisp This will result in three new @code{nnml} mail groups being created: @samp{nnml:junk}, @samp{nnml:crazy}, and @samp{nnml:other}. All the mail that doesn't fit into the first two groups will be placed in the last group. This should be sufficient for reading mail with Gnus. You might want to give the other sections in this part of the manual a perusal, though. Especially @pxref{Choosing a Mail Back End} and @pxref{Expiring Mail}. @node Splitting Mail @subsection Splitting Mail @cindex splitting mail @cindex mail splitting @cindex mail filtering (splitting) @vindex nnmail-split-methods The @code{nnmail-split-methods} variable says how the incoming mail is to be split into groups. @lisp (setq nnmail-split-methods '(("mail.junk" "^From:.*Lars Ingebrigtsen") ("mail.crazy" "^Subject:.*die\\|^Organization:.*flabby") ("mail.other" ""))) @end lisp This variable is a list of lists, where the first element of each of these lists is the name of the mail group (they do not have to be called something beginning with @samp{mail}, by the way), and the second element is a regular expression used on the header of each mail to determine if it belongs in this mail group. The first string may contain @samp{\\1} forms, like the ones used by @code{replace-match} to insert sub-expressions from the matched text. For instance: @lisp ("list.\\1" "From:.* \\(.*\$$-list@@majordomo.com") @end lisp @noindent In that case, @code{nnmail-split-lowercase-expanded} controls whether the inserted text should be made lowercase. @xref{Fancy Mail Splitting}. The second element can also be a function. In that case, it will be called narrowed to the headers with the first element of the rule as the argument. It should return a non-@code{nil} value if it thinks that the mail belongs in that group. @cindex @samp{bogus} group The last of these groups should always be a general one, and the regular expression should @emph{always} be @samp{""} so that it matches any mails that haven't been matched by any of the other regexps. (These rules are processed from the beginning of the alist toward the end. The first rule to make a match will win'', unless you have crossposting enabled. In that case, all matching rules will win''.) If no rule matched, the mail will end up in the @samp{bogus} group. When new groups are created by splitting mail, you may want to run @code{gnus-group-find-new-groups} to see the new groups. This also applies to the @samp{bogus} group. If you like to tinker with this yourself, you can set this variable to a function of your choice. This function will be called without any arguments in a buffer narrowed to the headers of an incoming mail message. The function should return a list of group names that it thinks should carry this mail message. Note that the mail back ends are free to maul the poor, innocent, incoming headers all they want to. They all add @code{Lines} headers; some add @code{X-Gnus-Group} headers; most rename the Unix mbox @code{From<SPACE>} line to something else. @vindex nnmail-crosspost The mail back ends all support cross-posting. If several regexps match, the mail will be cross-posted'' to all those groups. @code{nnmail-crosspost} says whether to use this mechanism or not. Note that no articles are crossposted to the general (@samp{""}) group. @vindex nnmail-crosspost-link-function @cindex crosspost @cindex links @code{nnmh} and @code{nnml} makes crossposts by creating hard links to the crossposted articles. However, not all file systems support hard links. If that's the case for you, set @code{nnmail-crosspost-link-function} to @code{copy-file}. (This variable is @code{add-name-to-file} by default.) @kindex M-x nnmail-split-history @findex nnmail-split-history If you wish to see where the previous mail split put the messages, you can use the @kbd{M-x nnmail-split-history} command. If you wish to see where re-spooling messages would put the messages, you can use @code{gnus-summary-respool-trace} and related commands (@pxref{Mail Group Commands}). @vindex nnmail-split-header-length-limit Header lines longer than the value of @code{nnmail-split-header-length-limit} are excluded from the split function. @vindex nnmail-mail-splitting-charset @vindex nnmail-mail-splitting-decodes By default, splitting @acronym{MIME}-decodes headers so you can match on non-@acronym{ASCII} strings. The @code{nnmail-mail-splitting-charset} variable specifies the default charset for decoding. The behavior can be turned off completely by binding @code{nnmail-mail-splitting-decodes} to @code{nil}, which is useful if you want to match articles based on the raw header data. @vindex nnmail-resplit-incoming By default, splitting is performed on all incoming messages. If you specify a @code{directory} entry for the variable @code{mail-sources} (@pxref{Mail Source Specifiers}), however, then splitting does @emph{not} happen by default. You can set the variable @code{nnmail-resplit-incoming} to a non-@code{nil} value to make splitting happen even in this case. (This variable has no effect on other kinds of entries.) Gnus gives you all the opportunity you could possibly want for shooting yourself in the foot. Let's say you create a group that will contain all the mail you get from your boss. And then you accidentally unsubscribe from the group. Gnus will still put all the mail from your boss in the unsubscribed group, and so, when your boss mails you Have that report ready by Monday or you're fired!'', you'll never see it and, come Tuesday, you'll still believe that you're gainfully employed while you really should be out collecting empty bottles to save up for next month's rent money. @node Mail Sources @subsection Mail Sources Mail can be gotten from many different sources---the mail spool, from a @acronym{POP} mail server, from a procmail directory, or from a maildir, for instance. @menu * Mail Source Specifiers:: How to specify what a mail source is. * Mail Source Customization:: Some variables that influence things. * Fetching Mail:: Using the mail source specifiers. @end menu @node Mail Source Specifiers @subsubsection Mail Source Specifiers @cindex POP @cindex mail server @cindex procmail @cindex mail spool @cindex mail source You tell Gnus how to fetch mail by setting @code{mail-sources} (@pxref{Fetching Mail}) to a @dfn{mail source specifier}. Here's an example: @lisp (pop :server "pop3.mailserver.com" :user "myname") @end lisp As can be observed, a mail source specifier is a list where the first element is a @dfn{mail source type}, followed by an arbitrary number of @dfn{keywords}. Keywords that are not explicitly specified are given default values. The following mail source types are available: @table @code @item file Get mail from a single file; typically from the mail spool. Keywords: @table @code @item :path The file name. Defaults to the value of the @env{MAIL} environment variable or the value of @code{rmail-spool-directory} (usually something like @file{/usr/mail/spool/user-name}). @item :prescript @itemx :postscript Script run before/after fetching mail. @end table An example file mail source: @lisp (file :path "/usr/spool/mail/user-name") @end lisp Or using the default file name: @lisp (file) @end lisp If the mail spool file is not located on the local machine, it's best to use @acronym{POP} or @acronym{IMAP} or the like to fetch the mail. You can not use ange-ftp file names here---it has no way to lock the mail spool while moving the mail. If it's impossible to set up a proper server, you can use ssh instead. @lisp (setq mail-sources '((file :prescript "ssh host bin/getmail >%t"))) @end lisp The @samp{getmail} script would look something like the following: @example #!/bin/sh # getmail - move mail from spool to stdout # flu@@iki.fi MOVEMAIL=/usr/lib/emacs/20.3/i386-redhat-linux/movemail TMP=$HOME/Mail/tmp
rm -f $TMP;$MOVEMAIL $MAIL$TMP >/dev/null && cat $TMP @end example Alter this script to fit the @samp{movemail} and temporary file you want to use. @item directory @vindex nnmail-scan-directory-mail-source-once Get mail from several files in a directory. This is typically used when you have procmail split the incoming mail into several files. That is, there is a one-to-one correspondence between files in that directory and groups, so that mail from the file @file{foo.bar.spool} will be put in the group @code{foo.bar}. (You can change the suffix to be used instead of @code{.spool}.) Setting @code{nnmail-scan-directory-mail-source-once} to non-@code{nil} forces Gnus to scan the mail source only once. This is particularly useful if you want to scan mail groups at a specified level. @vindex nnmail-resplit-incoming There is also the variable @code{nnmail-resplit-incoming}, if you set that to a non-@code{nil} value, then the normal splitting process is applied to all the files from the directory, @ref{Splitting Mail}. Keywords: @table @code @item :path The name of the directory where the files are. There is no default value. @item :suffix Only files ending with this suffix are used. The default is @samp{.spool}. @item :predicate Only files that have this predicate return non-@code{nil} are returned. The default is @code{identity}. This is used as an additional filter---only files that have the right suffix @emph{and} satisfy this predicate are considered. @item :prescript @itemx :postscript Script run before/after fetching mail. @end table An example directory mail source: @lisp (directory :path "/home/user-name/procmail-dir/" :suffix ".prcml") @end lisp @item pop Get mail from a @acronym{POP} server. Keywords: @table @code @item :server The name of the @acronym{POP} server. The default is taken from the @env{MAILHOST} environment variable. @item :port The port number of the @acronym{POP} server. This can be a number (eg, @samp{:port 1234}) or a string (eg, @samp{:port "pop3"}). If it is a string, it should be a service name as listed in @file{/etc/services} on Unix systems. The default is @samp{"pop3"}. On some systems you might need to specify it as @samp{"pop-3"} instead. @item :user The user name to give to the @acronym{POP} server. The default is the login name. @item :password The password to give to the @acronym{POP} server. If not specified, the user is prompted. @item :program The program to use to fetch mail from the @acronym{POP} server. This should be a @code{format}-like string. Here's an example: @example fetchmail %u@@%s -P %p %t @end example The valid format specifier characters are: @table @samp @item t The name of the file the mail is to be moved to. This must always be included in this string. @item s The name of the server. @item P The port number of the server. @item u The user name to use. @item p The password to use. @end table The values used for these specs are taken from the values you give the corresponding keywords. @item :prescript A script to be run before fetching the mail. The syntax is the same as the @code{:program} keyword. This can also be a function to be run. @item :postscript A script to be run after fetching the mail. The syntax is the same as the @code{:program} keyword. This can also be a function to be run. @item :function The function to use to fetch mail from the @acronym{POP} server. The function is called with one parameter---the name of the file where the mail should be moved to. @item :authentication This can be either the symbol @code{password} or the symbol @code{apop} and says what authentication scheme to use. The default is @code{password}. @end table @vindex pop3-movemail @vindex pop3-leave-mail-on-server If the @code{:program} and @code{:function} keywords aren't specified, @code{pop3-movemail} will be used. If @code{pop3-leave-mail-on-server} is non-@code{nil} the mail is to be left on the @acronym{POP} server after fetching when using @code{pop3-movemail}. Note that POP servers maintain no state information between sessions, so what the client believes is there and what is actually there may not match up. If they do not, then you may get duplicate mails or the whole thing can fall apart and leave you with a corrupt mailbox. Here are some examples for getting mail from a @acronym{POP} server. Fetch from the default @acronym{POP} server, using the default user name, and default fetcher: @lisp (pop) @end lisp Fetch from a named server with a named user and password: @lisp (pop :server "my.pop.server" :user "user-name" :password "secret") @end lisp Use @samp{movemail} to move the mail: @lisp (pop :program "movemail po:%u %t %p") @end lisp @item maildir Get mail from a maildir. This is a type of mailbox that is supported by at least qmail and postfix, where each file in a special directory contains exactly one mail. Keywords: @table @code @item :path The name of the directory where the mails are stored. The default is taken from the @env{MAILDIR} environment variable or @file{~/Maildir/}. @item :subdirs The subdirectories of the Maildir. The default is @samp{("new" "cur")}. @c If you sometimes look at your mail through a pop3 daemon before fetching @c them with Gnus, you may also have to fetch your mails from the @c @code{cur} directory inside the maildir, like in the first example @c below. You can also get mails from remote hosts (because maildirs don't suffer from locking problems). @end table Two example maildir mail sources: @lisp (maildir :path "/home/user-name/Maildir/" :subdirs ("cur" "new")) @end lisp @lisp (maildir :path "/user@@remotehost.org:~/Maildir/" :subdirs ("new")) @end lisp @item imap Get mail from a @acronym{IMAP} server. If you don't want to use @acronym{IMAP} as intended, as a network mail reading protocol (ie with nnimap), for some reason or other, Gnus let you treat it similar to a @acronym{POP} server and fetches articles from a given @acronym{IMAP} mailbox. @xref{IMAP}, for more information. Note that for the Kerberos, GSSAPI, @acronym{TLS}/@acronym{SSL} and STARTTLS support you may need external programs and libraries, @xref{IMAP}. Keywords: @table @code @item :server The name of the @acronym{IMAP} server. The default is taken from the @env{MAILHOST} environment variable. @item :port The port number of the @acronym{IMAP} server. The default is @samp{143}, or @samp{993} for @acronym{TLS}/@acronym{SSL} connections. @item :user The user name to give to the @acronym{IMAP} server. The default is the login name. @item :password The password to give to the @acronym{IMAP} server. If not specified, the user is prompted. @item :stream What stream to use for connecting to the server, this is one of the symbols in @code{imap-stream-alist}. Right now, this means @samp{gssapi}, @samp{kerberos4}, @samp{starttls}, @samp{tls}, @samp{ssl}, @samp{shell} or the default @samp{network}. @item :authentication Which authenticator to use for authenticating to the server, this is one of the symbols in @code{imap-authenticator-alist}. Right now, this means @samp{gssapi}, @samp{kerberos4}, @samp{digest-md5}, @samp{cram-md5}, @samp{anonymous} or the default @samp{login}. @item :program When using the shell' :stream, the contents of this variable is mapped into the @code{imap-shell-program} variable. This should be a @code{format}-like string (or list of strings). Here's an example: @example ssh %s imapd @end example The valid format specifier characters are: @table @samp @item s The name of the server. @item l User name from @code{imap-default-user}. @item p The port number of the server. @end table The values used for these specs are taken from the values you give the corresponding keywords. @item :mailbox The name of the mailbox to get mail from. The default is @samp{INBOX} which normally is the mailbox which receive incoming mail. @item :predicate The predicate used to find articles to fetch. The default, @samp{UNSEEN UNDELETED}, is probably the best choice for most people, but if you sometimes peek in your mailbox with a @acronym{IMAP} client and mark some articles as read (or; SEEN) you might want to set this to @samp{1:*}. Then all articles in the mailbox is fetched, no matter what. For a complete list of predicates, see RFC 2060 section 6.4.4. @item :fetchflag How to flag fetched articles on the server, the default @samp{\Deleted} will mark them as deleted, an alternative would be @samp{\Seen} which would simply mark them as read. These are the two most likely choices, but more flags are defined in RFC 2060 section 2.3.2. @item :dontexpunge If non-@code{nil}, don't remove all articles marked as deleted in the mailbox after finishing the fetch. @end table An example @acronym{IMAP} mail source: @lisp (imap :server "mail.mycorp.com" :stream kerberos4 :fetchflag "\\Seen") @end lisp @item webmail Get mail from a webmail server, such as @uref{http://www.hotmail.com/}, @uref{http://webmail.netscape.com/}, @uref{http://www.netaddress.com/}, @uref{http://mail.yahoo.com/}. NOTE: Webmail largely depends on cookies. A "one-line-cookie" patch is required for url "4.0pre.46". WARNING: Mails may be lost. NO WARRANTY. Keywords: @table @code @item :subtype The type of the webmail server. The default is @code{hotmail}. The alternatives are @code{netscape}, @code{netaddress}, @code{my-deja}. @item :user The user name to give to the webmail server. The default is the login name. @item :password The password to give to the webmail server. If not specified, the user is prompted. @item :dontexpunge If non-@code{nil}, only fetch unread articles and don't move them to trash folder after finishing the fetch. @end table An example webmail source: @lisp (webmail :subtype 'hotmail :user "user-name" :password "secret") @end lisp @end table @table @dfn @item Common Keywords Common keywords can be used in any type of mail source. Keywords: @table @code @item :plugged If non-@code{nil}, fetch the mail even when Gnus is unplugged. If you use directory source to get mail, you can specify it as in this example: @lisp (setq mail-sources '((directory :path "/home/pavel/.Spool/" :suffix "" :plugged t))) @end lisp Gnus will then fetch your mail even when you are unplugged. This is useful when you use local mail and news. @end table @end table @subsubsection Function Interface Some of the above keywords specify a Lisp function to be executed. For each keyword @code{:foo}, the Lisp variable @code{foo} is bound to the value of the keyword while the function is executing. For example, consider the following mail-source setting: @lisp (setq mail-sources '((pop :user "jrl" :server "pophost" :function fetchfunc))) @end lisp While the function @code{fetchfunc} is executing, the symbol @code{user} is bound to @code{"jrl"}, and the symbol @code{server} is bound to @code{"pophost"}. The symbols @code{port}, @code{password}, @code{program}, @code{prescript}, @code{postscript}, @code{function}, and @code{authentication} are also bound (to their default values). See above for a list of keywords for each type of mail source. @node Mail Source Customization @subsubsection Mail Source Customization The following is a list of variables that influence how the mail is fetched. You would normally not need to set or change any of these variables. @table @code @item mail-source-crash-box @vindex mail-source-crash-box File where mail will be stored while processing it. The default is@* @file{~/.emacs-mail-crash-box}. @item mail-source-delete-incoming @vindex mail-source-delete-incoming If non-@code{nil}, delete incoming files after handling them. If @code{t}, delete the files immediately, if @code{nil}, never delete any files. If a positive number, delete files older than number of days (This will only happen, when receiving new mail). You may also set @code{mail-source-delete-incoming} to @code{nil} and call @code{mail-source-delete-old-incoming} from a hook or interactively. @item mail-source-delete-old-incoming-confirm @vindex mail-source-delete-old-incoming-confirm If non-@code{nil}, ask for for confirmation before deleting old incoming files. This variable only applies when @code{mail-source-delete-incoming} is a positive number. @item mail-source-ignore-errors @vindex mail-source-ignore-errors If non-@code{nil}, ignore errors when reading mail from a mail source. @item mail-source-directory @vindex mail-source-directory Directory where incoming mail source files (if any) will be stored. The default is @file{~/Mail/}. At present, the only thing this is used for is to say where the incoming files will be stored if the variable @code{mail-source-delete-incoming} is @code{nil} or a number. @item mail-source-incoming-file-prefix @vindex mail-source-incoming-file-prefix Prefix for file name for storing incoming mail. The default is @file{Incoming}, in which case files will end up with names like @file{Incoming30630D_} or @file{Incoming298602ZD}. This is really only relevant if @code{mail-source-delete-incoming} is @code{nil} or a number. @item mail-source-default-file-modes @vindex mail-source-default-file-modes All new mail files will get this file mode. The default is 384. @item mail-source-movemail-program @vindex mail-source-movemail-program If non-@code{nil}, name of program for fetching new mail. If @code{nil}, @code{movemail} in @var{exec-directory}. @end table @node Fetching Mail @subsubsection Fetching Mail @vindex mail-sources @vindex nnmail-spool-file The way to actually tell Gnus where to get new mail from is to set @code{mail-sources} to a list of mail source specifiers (@pxref{Mail Source Specifiers}). If this variable (and the obsolescent @code{nnmail-spool-file}) is @code{nil}, the mail back ends will never attempt to fetch mail by themselves. If you want to fetch mail both from your local spool as well as a @acronym{POP} mail server, you'd say something like: @lisp (setq mail-sources '((file) (pop :server "pop3.mail.server" :password "secret"))) @end lisp Or, if you don't want to use any of the keyword defaults: @lisp (setq mail-sources '((file :path "/var/spool/mail/user-name") (pop :server "pop3.mail.server" :user "user-name" :port "pop3" :password "secret"))) @end lisp When you use a mail back end, Gnus will slurp all your mail from your inbox and plonk it down in your home directory. Gnus doesn't move any mail if you're not using a mail back end---you have to do a lot of magic invocations first. At the time when you have finished drawing the pentagram, lightened the candles, and sacrificed the goat, you really shouldn't be too surprised when Gnus moves your mail. @node Mail Back End Variables @subsection Mail Back End Variables These variables are (for the most part) pertinent to all the various mail back ends. @table @code @vindex nnmail-read-incoming-hook @item nnmail-read-incoming-hook The mail back ends all call this hook after reading new mail. You can use this hook to notify any mail watch programs, if you want to. @vindex nnmail-split-hook @item nnmail-split-hook @findex gnus-article-decode-encoded-words @cindex RFC 1522 decoding @cindex RFC 2047 decoding Hook run in the buffer where the mail headers of each message is kept just before the splitting based on these headers is done. The hook is free to modify the buffer contents in any way it sees fit---the buffer is discarded after the splitting has been done, and no changes performed in the buffer will show up in any files. @code{gnus-article-decode-encoded-words} is one likely function to add to this hook. @vindex nnmail-pre-get-new-mail-hook @vindex nnmail-post-get-new-mail-hook @item nnmail-pre-get-new-mail-hook @itemx nnmail-post-get-new-mail-hook These are two useful hooks executed when treating new incoming mail---@code{nnmail-pre-get-new-mail-hook} (is called just before starting to handle the new mail) and @code{nnmail-post-get-new-mail-hook} (is called when the mail handling is done). Here's and example of using these two hooks to change the default file modes the new mail files get: @lisp (add-hook 'nnmail-pre-get-new-mail-hook (lambda () (set-default-file-modes 511))) (add-hook 'nnmail-post-get-new-mail-hook (lambda () (set-default-file-modes 551))) @end lisp @item nnmail-use-long-file-names @vindex nnmail-use-long-file-names If non-@code{nil}, the mail back ends will use long file and directory names. Groups like @samp{mail.misc} will end up in directories (assuming use of @code{nnml} back end) or files (assuming use of @code{nnfolder} back end) like @file{mail.misc}. If it is @code{nil}, the same group will end up in @file{mail/misc}. @item nnmail-delete-file-function @vindex nnmail-delete-file-function @findex delete-file Function called to delete files. It is @code{delete-file} by default. @item nnmail-cache-accepted-message-ids @vindex nnmail-cache-accepted-message-ids If non-@code{nil}, put the @code{Message-ID}s of articles imported into the back end (via @code{Gcc}, for instance) into the mail duplication discovery cache. The default is @code{nil}. @item nnmail-cache-ignore-groups @vindex nnmail-cache-ignore-groups This can be a regular expression or a list of regular expressions. Group names that match any of the regular expressions will never be recorded in the @code{Message-ID} cache. This can be useful, for example, when using Fancy Splitting (@pxref{Fancy Mail Splitting}) together with the function @code{nnmail-split-fancy-with-parent}. @end table @node Fancy Mail Splitting @subsection Fancy Mail Splitting @cindex mail splitting @cindex fancy mail splitting @vindex nnmail-split-fancy @findex nnmail-split-fancy If the rather simple, standard method for specifying how to split mail doesn't allow you to do what you want, you can set @code{nnmail-split-methods} to @code{nnmail-split-fancy}. Then you can play with the @code{nnmail-split-fancy} variable. Let's look at an example value of this variable first: @lisp ;; @r{Messages from the mailer daemon are not crossposted to any of} ;; @r{the ordinary groups. Warnings are put in a separate group} ;; @r{from real errors.} (| ("from" mail (| ("subject" "warn.*" "mail.warning") "mail.misc")) ;; @r{Non-error messages are crossposted to all relevant} ;; @r{groups, but we don't crosspost between the group for the} ;; @r{(ding) list and the group for other (ding) related mail.} (& (| (any "ding@@ifi\\.uio\\.no" "ding.list") ("subject" "ding" "ding.misc")) ;; @r{Other mailing lists@dots{}} (any "procmail@@informatik\\.rwth-aachen\\.de" "procmail.list") (any "SmartList@@informatik\\.rwth-aachen\\.de" "SmartList.list") ;; @r{Both lists below have the same suffix, so prevent} ;; @r{cross-posting to mkpkg.list of messages posted only to} ;; @r{the bugs- list, but allow cross-posting when the} ;; @r{message was really cross-posted.} (any "bugs-mypackage@@somewhere" "mypkg.bugs") (any "mypackage@@somewhere" - "bugs-mypackage" "mypkg.list") ;; @r{People@dots{}} (any "larsi@@ifi\\.uio\\.no" "people.Lars_Magne_Ingebrigtsen")) ;; @r{Unmatched mail goes to the catch all group.} "misc.misc") @end lisp This variable has the format of a @dfn{split}. A split is a (possibly) recursive structure where each split may contain other splits. Here are the possible split syntaxes: @table @code @item group If the split is a string, that will be taken as a group name. Normal regexp match expansion will be done. See below for examples. @c Don't fold this line. @item (@var{field} @var{value} [- @var{restrict} [@dots{}] ] @var{split} [@var{invert-partial}]) The split can be a list containing at least three elements. If the first element @var{field} (a regexp matching a header) contains @var{value} (also a regexp) then store the message as specified by @var{split}. If @var{restrict} (yet another regexp) matches some string after @var{field} and before the end of the matched @var{value}, the @var{split} is ignored. If none of the @var{restrict} clauses match, @var{split} is processed. The last element @var{invert-partial} is optional. If it is non-@code{nil}, the match-partial-words behavior controlled by the variable @code{nnmail-split-fancy-match-partial-words} (see below) is be inverted. (New in Gnus 5.10.7) @item (| @var{split} @dots{}) If the split is a list, and the first element is @code{|} (vertical bar), then process each @var{split} until one of them matches. A @var{split} is said to match if it will cause the mail message to be stored in one or more groups. @item (& @var{split} @dots{}) If the split is a list, and the first element is @code{&}, then process all @var{split}s in the list. @item junk If the split is the symbol @code{junk}, then don't save (i.e., delete) this message. Use with extreme caution. @item (: @var{function} @var{arg1} @var{arg2} @dots{}) If the split is a list, and the first element is @samp{:}, then the second element will be called as a function with @var{args} given as arguments. The function should return a @var{split}. @cindex body split For instance, the following function could be used to split based on the body of the messages: @lisp (defun split-on-body () (save-excursion (save-restriction (widen) (goto-char (point-min)) (when (re-search-forward "Some.*string" nil t) "string.group")))) @end lisp The buffer is narrowed to the message in question when @var{function} is run. That's why @code{(widen)} needs to be called after @code{save-excursion} and @code{save-restriction} in the example above. Also note that with the nnimap backend, message bodies will not be downloaded by default. You need to set @code{nnimap-split-download-body} to @code{t} to do that (@pxref{Splitting in IMAP}). @item (! @var{func} @var{split}) If the split is a list, and the first element is @code{!}, then @var{split} will be processed, and @var{func} will be called as a function with the result of @var{split} as argument. @var{func} should return a split. @item nil If the split is @code{nil}, it is ignored. @end table In these splits, @var{field} must match a complete field name. Normally, @var{value} in these splits must match a complete @emph{word} according to the fundamental mode syntax table. In other words, all @var{value}'s will be implicitly surrounded by @code{\<...\>} markers, which are word delimiters. Therefore, if you use the following split, for example, @example (any "joe" "joemail") @end example @noindent messages sent from @samp{joedavis@@foo.org} will normally not be filed in @samp{joemail}. If you want to alter this behavior, you can use any of the following three ways: @enumerate @item @vindex nnmail-split-fancy-match-partial-words You can set the @code{nnmail-split-fancy-match-partial-words} variable to non-@code{nil} in order to ignore word boundaries and instead the match becomes more like a grep. This variable controls whether partial words are matched during fancy splitting. The default value is @code{nil}. Note that it influences all @var{value}'s in your split rules. @item @var{value} beginning with @code{.*} ignores word boundaries in front of a word. Similarly, if @var{value} ends with @code{.*}, word boundaries in the rear of a word will be ignored. For example, the @var{value} @code{"@@example\\.com"} does not match @samp{foo@@example.com} but @code{".*@@example\\.com"} does. @item You can set the @var{invert-partial} flag in your split rules of the @samp{(@var{field} @var{value} @dots{})} types, aforementioned in this section. If the flag is set, word boundaries on both sides of a word are ignored even if @code{nnmail-split-fancy-match-partial-words} is @code{nil}. Contrarily, if the flag is set, word boundaries are not ignored even if @code{nnmail-split-fancy-match-partial-words} is non-@code{nil}. (New in Gnus 5.10.7) @end enumerate @vindex nnmail-split-abbrev-alist @var{field} and @var{value} can also be Lisp symbols, in that case they are expanded as specified by the variable @code{nnmail-split-abbrev-alist}. This is an alist of cons cells, where the @sc{car} of a cell contains the key, and the @sc{cdr} contains the associated value. Predefined entries in @code{nnmail-split-abbrev-alist} include: @table @code @item from Matches the @samp{From}, @samp{Sender} and @samp{Resent-From} fields. @item to Matches the @samp{To}, @samp{Cc}, @samp{Apparently-To}, @samp{Resent-To} and @samp{Resent-Cc} fields. @item any Is the union of the @code{from} and @code{to} entries. @end table @vindex nnmail-split-fancy-syntax-table @code{nnmail-split-fancy-syntax-table} is the syntax table in effect when all this splitting is performed. If you want to have Gnus create groups dynamically based on some information in the headers (i.e., do @code{replace-match}-like substitutions in the group names), you can say things like: @example (any "debian-\\b\$$\\w+\$$@@lists.debian.org" "mail.debian.\\1") @end example In this example, messages sent to @samp{debian-foo@@lists.debian.org} will be filed in @samp{mail.debian.foo}. If the string contains the element @samp{\&}, then the previously matched string will be substituted. Similarly, the elements @samp{\\1} up to @samp{\\9} will be substituted with the text matched by the groupings 1 through 9. @vindex nnmail-split-lowercase-expanded Where @code{nnmail-split-lowercase-expanded} controls whether the lowercase of the matched string should be used for the substitution. Setting it as non-@code{nil} is useful to avoid the creation of multiple groups when users send to an address using different case (i.e. mailing-list@@domain vs Mailing-List@@Domain). The default value is @code{t}. @findex nnmail-split-fancy-with-parent @code{nnmail-split-fancy-with-parent} is a function which allows you to split followups into the same groups their parents are in. Sometimes you can't make splitting rules for all your mail. For example, your boss might send you personal mail regarding different projects you are working on, and as you can't tell your boss to put a distinguishing string into the subject line, you have to resort to manually moving the messages into the right group. With this function, you only have to do it once per thread. To use this feature, you have to set @code{nnmail-treat-duplicates} and @code{nnmail-cache-accepted-message-ids} to a non-@code{nil} value. And then you can include @code{nnmail-split-fancy-with-parent} using the colon feature, like so: @lisp (setq nnmail-treat-duplicates 'warn ; @r{or @code{delete}} nnmail-cache-accepted-message-ids t nnmail-split-fancy '(| (: nnmail-split-fancy-with-parent) ;; @r{other splits go here} )) @end lisp This feature works as follows: when @code{nnmail-treat-duplicates} is non-@code{nil}, Gnus records the message id of every message it sees in the file specified by the variable @code{nnmail-message-id-cache-file}, together with the group it is in (the group is omitted for non-mail messages). When mail splitting is invoked, the function @code{nnmail-split-fancy-with-parent} then looks at the References (and In-Reply-To) header of each message to split and searches the file specified by @code{nnmail-message-id-cache-file} for the message ids. When it has found a parent, it returns the corresponding group name unless the group name matches the regexp @code{nnmail-split-fancy-with-parent-ignore-groups}. It is recommended that you set @code{nnmail-message-id-cache-length} to a somewhat higher number than the default so that the message ids are still in the cache. (A value of 5000 appears to create a file some 300 kBytes in size.) @vindex nnmail-cache-accepted-message-ids When @code{nnmail-cache-accepted-message-ids} is non-@code{nil}, Gnus also records the message ids of moved articles, so that the followup messages goes into the new group. Also see the variable @code{nnmail-cache-ignore-groups} if you don't want certain groups to be recorded in the cache. For example, if all outgoing messages are written to an outgoing'' group, you could set @code{nnmail-cache-ignore-groups} to match that group name. Otherwise, answers to all your messages would end up in the outgoing'' group. @node Group Mail Splitting @subsection Group Mail Splitting @cindex mail splitting @cindex group mail splitting @findex gnus-group-split If you subscribe to dozens of mailing lists but you don't want to maintain mail splitting rules manually, group mail splitting is for you. You just have to set @code{to-list} and/or @code{to-address} in group parameters or group customization and set @code{nnmail-split-methods} to @code{gnus-group-split}. This splitting function will scan all groups for those parameters and split mail accordingly, i.e., messages posted from or to the addresses specified in the parameters @code{to-list} or @code{to-address} of a mail group will be stored in that group. Sometimes, mailing lists have multiple addresses, and you may want mail splitting to recognize them all: just set the @code{extra-aliases} group parameter to the list of additional addresses and it's done. If you'd rather use a regular expression, set @code{split-regexp}. All these parameters in a group will be used to create an @code{nnmail-split-fancy} split, in which the @var{field} is @samp{any}, the @var{value} is a single regular expression that matches @code{to-list}, @code{to-address}, all of @code{extra-aliases} and all matches of @code{split-regexp}, and the @var{split} is the name of the group. @var{restrict}s are also supported: just set the @code{split-exclude} parameter to a list of regular expressions. If you can't get the right split to be generated using all these parameters, or you just need something fancier, you can set the parameter @code{split-spec} to an @code{nnmail-split-fancy} split. In this case, all other aforementioned parameters will be ignored by @code{gnus-group-split}. In particular, @code{split-spec} may be set to @code{nil}, in which case the group will be ignored by @code{gnus-group-split}. @vindex gnus-group-split-default-catch-all-group @code{gnus-group-split} will do cross-posting on all groups that match, by defining a single @code{&} fancy split containing one split for each group. If a message doesn't match any split, it will be stored in the group named in @code{gnus-group-split-default-catch-all-group}, unless some group has @code{split-spec} set to @code{catch-all}, in which case that group is used as the catch-all group. Even though this variable is often used just to name a group, it may also be set to an arbitrarily complex fancy split (after all, a group name is a fancy split), and this may be useful to split mail that doesn't go to any mailing list to personal mail folders. Note that this fancy split is added as the last element of a @code{|} split list that also contains a @code{&} split with the rules extracted from group parameters. It's time for an example. Assume the following group parameters have been defined: @example nnml:mail.bar: ((to-address . "bar@@femail.com") (split-regexp . ".*@@femail\\.com")) nnml:mail.foo: ((to-list . "foo@@nowhere.gov") (extra-aliases "foo@@localhost" "foo-redist@@home") (split-exclude "bugs-foo" "rambling-foo") (admin-address . "foo-request@@nowhere.gov")) nnml:mail.others: ((split-spec . catch-all)) @end example Setting @code{nnmail-split-methods} to @code{gnus-group-split} will behave as if @code{nnmail-split-fancy} had been selected and variable @code{nnmail-split-fancy} had been set as follows: @lisp (| (& (any "\$$bar@@femail\\.com\\|.*@@femail\\.com\$$" "mail.bar") (any "\$$foo@@nowhere\\.gov\\|foo@@localhost\\|foo-redist@@home\$$" - "bugs-foo" - "rambling-foo" "mail.foo")) "mail.others") @end lisp @findex gnus-group-split-fancy If you'd rather not use group splitting for all your mail groups, you may use it for only some of them, by using @code{nnmail-split-fancy} splits like this: @lisp (: gnus-group-split-fancy @var{groups} @var{no-crosspost} @var{catch-all}) @end lisp @var{groups} may be a regular expression or a list of group names whose parameters will be scanned to generate the output split. @var{no-crosspost} can be used to disable cross-posting; in this case, a single @code{|} split will be output. @var{catch-all} is the fall back fancy split, used like @code{gnus-group-split-default-catch-all-group}. If @var{catch-all} is @code{nil}, or if @code{split-regexp} matches the empty string in any selected group, no catch-all split will be issued. Otherwise, if some group has @code{split-spec} set to @code{catch-all}, this group will override the value of the @var{catch-all} argument. @findex gnus-group-split-setup Unfortunately, scanning all groups and their parameters can be quite slow, especially considering that it has to be done for every message. But don't despair! The function @code{gnus-group-split-setup} can be used to enable @code{gnus-group-split} in a much more efficient way. It sets @code{nnmail-split-methods} to @code{nnmail-split-fancy} and sets @code{nnmail-split-fancy} to the split produced by @code{gnus-group-split-fancy}. Thus, the group parameters are only scanned once, no matter how many messages are split. @findex gnus-group-split-update However, if you change group parameters, you'd have to update @code{nnmail-split-fancy} manually. You can do it by running @code{gnus-group-split-update}. If you'd rather have it updated automatically, just tell @code{gnus-group-split-setup} to do it for you. For example, add to your @file{~/.gnus.el}: @lisp (gnus-group-split-setup @var{auto-update} @var{catch-all}) @end lisp If @var{auto-update} is non-@code{nil}, @code{gnus-group-split-update} will be added to @code{nnmail-pre-get-new-mail-hook}, so you won't ever have to worry about updating @code{nnmail-split-fancy} again. If you don't omit @var{catch-all} (it's optional, equivalent to @code{nil}), @code{gnus-group-split-default-catch-all-group} will be set to its value. @vindex gnus-group-split-updated-hook Because you may want to change @code{nnmail-split-fancy} after it is set by @code{gnus-group-split-update}, this function will run @code{gnus-group-split-updated-hook} just before finishing. @node Incorporating Old Mail @subsection Incorporating Old Mail @cindex incorporating old mail @cindex import old mail Most people have lots of old mail stored in various file formats. If you have set up Gnus to read mail using one of the spiffy Gnus mail back ends, you'll probably wish to have that old mail incorporated into your mail groups. Doing so can be quite easy. To take an example: You're reading mail using @code{nnml} (@pxref{Mail Spool}), and have set @code{nnmail-split-methods} to a satisfactory value (@pxref{Splitting Mail}). You have an old Unix mbox file filled with important, but old, mail. You want to move it into your @code{nnml} groups. Here's how: @enumerate @item Go to the group buffer. @item Type @kbd{G f} and give the file name to the mbox file when prompted to create an @code{nndoc} group from the mbox file (@pxref{Foreign Groups}). @item Type @kbd{SPACE} to enter the newly created group. @item Type @kbd{M P b} to process-mark all articles in this group's buffer (@pxref{Setting Process Marks}). @item Type @kbd{B r} to respool all the process-marked articles, and answer @samp{nnml} when prompted (@pxref{Mail Group Commands}). @end enumerate All the mail messages in the mbox file will now also be spread out over all your @code{nnml} groups. Try entering them and check whether things have gone without a glitch. If things look ok, you may consider deleting the mbox file, but I wouldn't do that unless I was absolutely sure that all the mail has ended up where it should be. Respooling is also a handy thing to do if you're switching from one mail back end to another. Just respool all the mail in the old mail groups using the new mail back end. @node Expiring Mail @subsection Expiring Mail @cindex article expiry @cindex expiring mail Traditional mail readers have a tendency to remove mail articles when you mark them as read, in some way. Gnus takes a fundamentally different approach to mail reading. Gnus basically considers mail just to be news that has been received in a rather peculiar manner. It does not think that it has the power to actually change the mail, or delete any mail messages. If you enter a mail group, and mark articles as read'', or kill them in some other fashion, the mail articles will still exist on the system. I repeat: Gnus will not delete your old, read mail. Unless you ask it to, of course. To make Gnus get rid of your unwanted mail, you have to mark the articles as @dfn{expirable}. (With the default key bindings, this means that you have to type @kbd{E}.) This does not mean that the articles will disappear right away, however. In general, a mail article will be deleted from your system if, 1) it is marked as expirable, AND 2) it is more than one week old. If you do not mark an article as expirable, it will remain on your system until hell freezes over. This bears repeating one more time, with some spurious capitalizations: IF you do NOT mark articles as EXPIRABLE, Gnus will NEVER delete those ARTICLES. You do not have to mark articles as expirable by hand. Gnus provides two features, called auto-expire'' and total-expire'', that can help you with this. In a nutshell, auto-expire'' means that Gnus hits @kbd{E} for you when you select an article. And total-expire'' means that Gnus considers all articles as expirable that are read. So, in addition to the articles marked @samp{E}, also the articles marked @samp{r}, @samp{R}, @samp{O}, @samp{K}, @samp{Y} and so on are considered expirable. When should either auto-expire or total-expire be used? Most people who are subscribed to mailing lists split each list into its own group and then turn on auto-expire or total-expire for those groups. (@xref{Splitting Mail}, for more information on splitting each list into its own group.) Which one is better, auto-expire or total-expire? It's not easy to answer. Generally speaking, auto-expire is probably faster. Another advantage of auto-expire is that you get more marks to work with: for the articles that are supposed to stick around, you can still choose between tick and dormant and read marks. But with total-expire, you only have dormant and ticked to choose from. The advantage of total-expire is that it works well with adaptive scoring (@pxref{Adaptive Scoring}). Auto-expire works with normal scoring but not with adaptive scoring. @vindex gnus-auto-expirable-newsgroups Groups that match the regular expression @code{gnus-auto-expirable-newsgroups} will have all articles that you read marked as expirable automatically. All articles marked as expirable have an @samp{E} in the first column in the summary buffer. By default, if you have auto expiry switched on, Gnus will mark all the articles you read as expirable, no matter if they were read or unread before. To avoid having articles marked as read marked as expirable automatically, you can put something like the following in your @file{~/.gnus.el} file: @vindex gnus-mark-article-hook @lisp (remove-hook 'gnus-mark-article-hook 'gnus-summary-mark-read-and-unread-as-read) (add-hook 'gnus-mark-article-hook 'gnus-summary-mark-unread-as-read) @end lisp Note that making a group auto-expirable doesn't mean that all read articles are expired---only the articles marked as expirable will be expired. Also note that using the @kbd{d} command won't make articles expirable---only semi-automatic marking of articles as read will mark the articles as expirable in auto-expirable groups. Let's say you subscribe to a couple of mailing lists, and you want the articles you have read to disappear after a while: @lisp (setq gnus-auto-expirable-newsgroups "mail.nonsense-list\\|mail.nice-list") @end lisp Another way to have auto-expiry happen is to have the element @code{auto-expire} in the group parameters of the group. If you use adaptive scoring (@pxref{Adaptive Scoring}) and auto-expiring, you'll have problems. Auto-expiring and adaptive scoring don't really mix very well. @vindex nnmail-expiry-wait The @code{nnmail-expiry-wait} variable supplies the default time an expirable article has to live. Gnus starts counting days from when the message @emph{arrived}, not from when it was sent. The default is seven days. Gnus also supplies a function that lets you fine-tune how long articles are to live, based on what group they are in. Let's say you want to have one month expiry period in the @samp{mail.private} group, a one day expiry period in the @samp{mail.junk} group, and a six day expiry period everywhere else: @vindex nnmail-expiry-wait-function @lisp (setq nnmail-expiry-wait-function (lambda (group) (cond ((string= group "mail.private") 31) ((string= group "mail.junk") 1) ((string= group "important") 'never) (t 6)))) @end lisp The group names this function is fed are unadorned'' group names---no @samp{nnml:} prefixes and the like. The @code{nnmail-expiry-wait} variable and @code{nnmail-expiry-wait-function} function can either be a number (not necessarily an integer) or one of the symbols @code{immediate} or @code{never}. You can also use the @code{expiry-wait} group parameter to selectively change the expiry period (@pxref{Group Parameters}). @vindex nnmail-expiry-target The normal action taken when expiring articles is to delete them. However, in some circumstances it might make more sense to move them to other groups instead of deleting them. The variable @code{nnmail-expiry-target} (and the @code{expiry-target} group parameter) controls this. The variable supplies a default value for all groups, which can be overridden for specific groups by the group parameter. default value is @code{delete}, but this can also be a string (which should be the name of the group the message should be moved to), or a function (which will be called in a buffer narrowed to the message in question, and with the name of the group being moved from as its parameter) which should return a target---either a group name or @code{delete}. Here's an example for specifying a group name: @lisp (setq nnmail-expiry-target "nnml:expired") @end lisp @findex nnmail-fancy-expiry-target @vindex nnmail-fancy-expiry-targets Gnus provides a function @code{nnmail-fancy-expiry-target} which will expire mail to groups according to the variable @code{nnmail-fancy-expiry-targets}. Here's an example: @lisp (setq nnmail-expiry-target 'nnmail-fancy-expiry-target nnmail-fancy-expiry-targets '((to-from "boss" "nnfolder:Work") ("subject" "IMPORTANT" "nnfolder:IMPORTANT.%Y.%b") ("from" ".*" "nnfolder:Archive-%Y"))) @end lisp With this setup, any mail that has @code{IMPORTANT} in its Subject header and was sent in the year @code{YYYY} and month @code{MMM}, will get expired to the group @code{nnfolder:IMPORTANT.YYYY.MMM}. If its From or To header contains the string @code{boss}, it will get expired to @code{nnfolder:Work}. All other mail will get expired to @code{nnfolder:Archive-YYYY}. @vindex nnmail-keep-last-article If @code{nnmail-keep-last-article} is non-@code{nil}, Gnus will never expire the final article in a mail newsgroup. This is to make life easier for procmail users. @vindex gnus-total-expirable-newsgroups By the way: That line up there, about Gnus never expiring non-expirable articles, is a lie. If you put @code{total-expire} in the group parameters, articles will not be marked as expirable, but all read articles will be put through the expiry process. Use with extreme caution. Even more dangerous is the @code{gnus-total-expirable-newsgroups} variable. All groups that match this regexp will have all read articles put through the expiry process, which means that @emph{all} old mail articles in the groups in question will be deleted after a while. Use with extreme caution, and don't come crying to me when you discover that the regexp you used matched the wrong group and all your important mail has disappeared. Be a @emph{man}! Or a @emph{woman}! Whatever you feel more comfortable with! So there! Most people make most of their mail groups total-expirable, though. @vindex gnus-inhibit-user-auto-expire If @code{gnus-inhibit-user-auto-expire} is non-@code{nil}, user marking commands will not mark an article as expirable, even if the group has auto-expire turned on. @node Washing Mail @subsection Washing Mail @cindex mail washing @cindex list server brain damage @cindex incoming mail treatment Mailers and list servers are notorious for doing all sorts of really, really stupid things with mail. Hey, RFC 822 doesn't explicitly prohibit us from adding the string @code{wE aRe ElItE!!!!!1!!} to the end of all lines passing through our server, so let's do that!!!!1!'' Yes, but RFC 822 wasn't designed to be read by morons. Things that were considered to be self-evident were not discussed. So. Here we are. Case in point: The German version of Microsoft Exchange adds @samp{AW: } to the subjects of replies instead of @samp{Re: }. I could pretend to be shocked and dismayed by this, but I haven't got the energy. It is to laugh. Gnus provides a plethora of functions for washing articles while displaying them, but it might be nicer to do the filtering before storing the mail to disk. For that purpose, we have three hooks and various functions that can be put in these hooks. @table @code @item nnmail-prepare-incoming-hook @vindex nnmail-prepare-incoming-hook This hook is called before doing anything with the mail and is meant for grand, sweeping gestures. It is called in a buffer that contains all the new, incoming mail. Functions to be used include: @table @code @item nnheader-ms-strip-cr @findex nnheader-ms-strip-cr Remove trailing carriage returns from each line. This is default on Emacs running on MS machines. @end table @item nnmail-prepare-incoming-header-hook @vindex nnmail-prepare-incoming-header-hook This hook is called narrowed to each header. It can be used when cleaning up the headers. Functions that can be used include: @table @code @item nnmail-remove-leading-whitespace @findex nnmail-remove-leading-whitespace Clear leading white space that helpful'' listservs have added to the headers to make them look nice. Aaah. (Note that this function works on both the header on the body of all messages, so it is a potentially dangerous function to use (if a body of a message contains something that looks like a header line). So rather than fix the bug, it is of course the right solution to make it into a feature by documenting it.) @item nnmail-remove-list-identifiers @findex nnmail-remove-list-identifiers Some list servers add an identifier---for example, @samp{(idm)}---to the beginning of all @code{Subject} headers. I'm sure that's nice for people who use stone age mail readers. This function will remove strings that match the @code{nnmail-list-identifiers} regexp, which can also be a list of regexp. @code{nnmail-list-identifiers} may not contain @code{\$$..\$$}. For instance, if you want to remove the @samp{(idm)} and the @samp{nagnagnag} identifiers: @lisp (setq nnmail-list-identifiers '("(idm)" "nagnagnag")) @end lisp This can also be done non-destructively with @code{gnus-list-identifiers}, @xref{Article Hiding}. @item nnmail-remove-tabs @findex nnmail-remove-tabs Translate all @samp{TAB} characters into @samp{SPACE} characters. @item nnmail-fix-eudora-headers @findex nnmail-fix-eudora-headers @cindex Eudora Eudora produces broken @code{References} headers, but OK @code{In-Reply-To} headers. This function will get rid of the @code{References} headers. @end table @item nnmail-prepare-incoming-message-hook @vindex nnmail-prepare-incoming-message-hook This hook is called narrowed to each message. Functions to be used include: @table @code @item article-de-quoted-unreadable @findex article-de-quoted-unreadable Decode Quoted Readable encoding. @end table @end table @node Duplicates @subsection Duplicates @vindex nnmail-treat-duplicates @vindex nnmail-message-id-cache-length @vindex nnmail-message-id-cache-file @cindex duplicate mails If you are a member of a couple of mailing lists, you will sometimes receive two copies of the same mail. This can be quite annoying, so @code{nnmail} checks for and treats any duplicates it might find. To do this, it keeps a cache of old @code{Message-ID}s--- @code{nnmail-message-id-cache-file}, which is @file{~/.nnmail-cache} by default. The approximate maximum number of @code{Message-ID}s stored there is controlled by the @code{nnmail-message-id-cache-length} variable, which is 1000 by default. (So 1000 @code{Message-ID}s will be stored.) If all this sounds scary to you, you can set @code{nnmail-treat-duplicates} to @code{warn} (which is what it is by default), and @code{nnmail} won't delete duplicate mails. Instead it will insert a warning into the head of the mail saying that it thinks that this is a duplicate of a different message. This variable can also be a function. If that's the case, the function will be called from a buffer narrowed to the message in question with the @code{Message-ID} as a parameter. The function must return either @code{nil}, @code{warn}, or @code{delete}. You can turn this feature off completely by setting the variable to @code{nil}. If you want all the duplicate mails to be put into a special @dfn{duplicates} group, you could do that using the normal mail split methods: @lisp (setq nnmail-split-fancy '(| ;; @r{Messages duplicates go to a separate group.} ("gnus-warning" "duplicat\$$e\\|ion\$$ of message" "duplicate") ;; @r{Message from daemons, postmaster, and the like to another.} (any mail "mail.misc") ;; @r{Other rules.} [...] )) @end lisp @noindent Or something like: @lisp (setq nnmail-split-methods '(("duplicates" "^Gnus-Warning:.*duplicate") ;; @r{Other rules.} [...])) @end lisp Here's a neat feature: If you know that the recipient reads her mail with Gnus, and that she has @code{nnmail-treat-duplicates} set to @code{delete}, you can send her as many insults as you like, just by using a @code{Message-ID} of a mail that you know that she's already received. Think of all the fun! She'll never see any of it! Whee! @node Not Reading Mail @subsection Not Reading Mail If you start using any of the mail back ends, they have the annoying habit of assuming that you want to read mail with them. This might not be unreasonable, but it might not be what you want. If you set @code{mail-sources} and @code{nnmail-spool-file} to @code{nil}, none of the back ends will ever attempt to read incoming mail, which should help. @vindex nnbabyl-get-new-mail @vindex nnmbox-get-new-mail @vindex nnml-get-new-mail @vindex nnmh-get-new-mail @vindex nnfolder-get-new-mail This might be too much, if, for instance, you are reading mail quite happily with @code{nnml} and just want to peek at some old Rmail file you have stashed away with @code{nnbabyl}. All back ends have variables called back-end-@code{get-new-mail}. If you want to disable the @code{nnbabyl} mail reading, you edit the virtual server for the group to have a setting where @code{nnbabyl-get-new-mail} to @code{nil}. All the mail back ends will call @code{nn}*@code{-prepare-save-mail-hook} narrowed to the article to be saved before saving it when reading incoming mail. @node Choosing a Mail Back End @subsection Choosing a Mail Back End Gnus will read the mail spool when you activate a mail group. The mail file is first copied to your home directory. What happens after that depends on what format you want to store your mail in. There are six different mail back ends in the standard Gnus, and more back ends are available separately. The mail back end most people use (because it is possibly the fastest) is @code{nnml} (@pxref{Mail Spool}). @menu * Unix Mail Box:: Using the (quite) standard Un*x mbox. * Rmail Babyl:: Emacs programs use the Rmail Babyl format. * Mail Spool:: Store your mail in a private spool? * MH Spool:: An mhspool-like back end. * Maildir:: Another one-file-per-message format. * Mail Folders:: Having one file for each group. * Comparing Mail Back Ends:: An in-depth looks at pros and cons. @end menu @node Unix Mail Box @subsubsection Unix Mail Box @cindex nnmbox @cindex unix mail box @vindex nnmbox-active-file @vindex nnmbox-mbox-file The @dfn{nnmbox} back end will use the standard Un*x mbox file to store mail. @code{nnmbox} will add extra headers to each mail article to say which group it belongs in. Virtual server settings: @table @code @item nnmbox-mbox-file @vindex nnmbox-mbox-file The name of the mail box in the user's home directory. Default is @file{~/mbox}. @item nnmbox-active-file @vindex nnmbox-active-file The name of the active file for the mail box. Default is @file{~/.mbox-active}. @item nnmbox-get-new-mail @vindex nnmbox-get-new-mail If non-@code{nil}, @code{nnmbox} will read incoming mail and split it into groups. Default is @code{t}. @end table @node Rmail Babyl @subsubsection Rmail Babyl @cindex nnbabyl @cindex Rmail mbox @vindex nnbabyl-active-file @vindex nnbabyl-mbox-file The @dfn{nnbabyl} back end will use a Babyl mail box (aka. @dfn{Rmail mbox}) to store mail. @code{nnbabyl} will add extra headers to each mail article to say which group it belongs in. Virtual server settings: @table @code @item nnbabyl-mbox-file @vindex nnbabyl-mbox-file The name of the Rmail mbox file. The default is @file{~/RMAIL} @item nnbabyl-active-file @vindex nnbabyl-active-file The name of the active file for the rmail box. The default is @file{~/.rmail-active} @item nnbabyl-get-new-mail @vindex nnbabyl-get-new-mail If non-@code{nil}, @code{nnbabyl} will read incoming mail. Default is @code{t} @end table @node Mail Spool @subsubsection Mail Spool @cindex nnml @cindex mail @acronym{NOV} spool The @dfn{nnml} spool mail format isn't compatible with any other known format. It should be used with some caution. @vindex nnml-directory If you use this back end, Gnus will split all incoming mail into files, one file for each mail, and put the articles into the corresponding directories under the directory specified by the @code{nnml-directory} variable. The default value is @file{~/Mail/}. You do not have to create any directories beforehand; Gnus will take care of all that. If you have a strict limit as to how many files you are allowed to store in your account, you should not use this back end. As each mail gets its own file, you might very well occupy thousands of inodes within a few weeks. If this is no problem for you, and it isn't a problem for you having your friendly systems administrator walking around, madly, shouting Who is eating all my inodes?! Who? Who!?!'', then you should know that this is probably the fastest format to use. You do not have to trudge through a big mbox file just to read your new mail. @code{nnml} is probably the slowest back end when it comes to article splitting. It has to create lots of files, and it also generates @acronym{NOV} databases for the incoming mails. This makes it possibly the fastest back end when it comes to reading mail. @cindex self contained nnml servers @cindex marks When the marks file is used (which it is by default), @code{nnml} servers have the property that you may backup them using @code{tar} or similar, and later be able to restore them into Gnus (by adding the proper @code{nnml} server) and have all your marks be preserved. Marks for a group is usually stored in the @code{.marks} file (but see @code{nnml-marks-file-name}) within each @code{nnml} group's directory. Individual @code{nnml} groups are also possible to backup, use @kbd{G m} to restore the group (after restoring the backup into the nnml directory). If for some reason you believe your @file{.marks} files are screwed up, you can just delete them all. Gnus will then correctly regenerate them next time it starts. Virtual server settings: @table @code @item nnml-directory @vindex nnml-directory All @code{nnml} directories will be placed under this directory. The default is the value of @code{message-directory} (whose default value is @file{~/Mail}). @item nnml-active-file @vindex nnml-active-file The active file for the @code{nnml} server. The default is @file{~/Mail/active}. @item nnml-newsgroups-file @vindex nnml-newsgroups-file The @code{nnml} group descriptions file. @xref{Newsgroups File Format}. The default is @file{~/Mail/newsgroups}. @item nnml-get-new-mail @vindex nnml-get-new-mail If non-@code{nil}, @code{nnml} will read incoming mail. The default is @code{t}. @item nnml-nov-is-evil @vindex nnml-nov-is-evil If non-@code{nil}, this back end will ignore any @acronym{NOV} files. The default is @code{nil}. @item nnml-nov-file-name @vindex nnml-nov-file-name The name of the @acronym{NOV} files. The default is @file{.overview}. @item nnml-prepare-save-mail-hook @vindex nnml-prepare-save-mail-hook Hook run narrowed to an article before saving. @item nnml-marks-is-evil @vindex nnml-marks-is-evil If non-@code{nil}, this back end will ignore any @sc{marks} files. The default is @code{nil}. @item nnml-marks-file-name @vindex nnml-marks-file-name The name of the @dfn{marks} files. The default is @file{.marks}. @item nnml-use-compressed-files @vindex nnml-use-compressed-files If non-@code{nil}, @code{nnml} will allow using compressed message files. @end table @findex nnml-generate-nov-databases If your @code{nnml} groups and @acronym{NOV} files get totally out of whack, you can do a complete update by typing @kbd{M-x nnml-generate-nov-databases}. This command will trawl through the entire @code{nnml} hierarchy, looking at each and every article, so it might take a while to complete. A better interface to this functionality can be found in the server buffer (@pxref{Server Commands}). @node MH Spool @subsubsection MH Spool @cindex nnmh @cindex mh-e mail spool @code{nnmh} is just like @code{nnml}, except that is doesn't generate @acronym{NOV} databases and it doesn't keep an active file or marks file. This makes @code{nnmh} a @emph{much} slower back end than @code{nnml}, but it also makes it easier to write procmail scripts for. Virtual server settings: @table @code @item nnmh-directory @vindex nnmh-directory All @code{nnmh} directories will be located under this directory. The default is the value of @code{message-directory} (whose default is @file{~/Mail}) @item nnmh-get-new-mail @vindex nnmh-get-new-mail If non-@code{nil}, @code{nnmh} will read incoming mail. The default is @code{t}. @item nnmh-be-safe @vindex nnmh-be-safe If non-@code{nil}, @code{nnmh} will go to ridiculous lengths to make sure that the articles in the folder are actually what Gnus thinks they are. It will check date stamps and stat everything in sight, so setting this to @code{t} will mean a serious slow-down. If you never use anything but Gnus to read the @code{nnmh} articles, you do not have to set this variable to @code{t}. The default is @code{nil}. @end table @node Maildir @subsubsection Maildir @cindex nnmaildir @cindex maildir @code{nnmaildir} stores mail in the maildir format, with each maildir corresponding to a group in Gnus. This format is documented here: @uref{http://cr.yp.to/proto/maildir.html} and here: @uref{http://www.qmail.org/man/man5/maildir.html}. @code{nnmaildir} also stores extra information in the @file{.nnmaildir/} directory within a maildir. Maildir format was designed to allow concurrent deliveries and reading, without needing locks. With other back ends, you would have your mail delivered to a spool of some kind, and then you would configure Gnus to split mail from that spool into your groups. You can still do that with @code{nnmaildir}, but the more common configuration is to have your mail delivered directly to the maildirs that appear as group in Gnus. @code{nnmaildir} is designed to be perfectly reliable: @kbd{C-g} will never corrupt its data in memory, and @code{SIGKILL} will never corrupt its data in the filesystem. @code{nnmaildir} stores article marks and @acronym{NOV} data in each maildir. So you can copy a whole maildir from one Gnus setup to another, and you will keep your marks. Virtual server settings: @table @code @item directory For each of your @code{nnmaildir} servers (it's very unlikely that you'd need more than one), you need to create a directory and populate it with maildirs or symlinks to maildirs (and nothing else; do not choose a directory already used for other purposes). Each maildir will be represented in Gnus as a newsgroup on that server; the filename of the symlink will be the name of the group. Any filenames in the directory starting with @samp{.} are ignored. The directory is scanned when you first start Gnus, and each time you type @kbd{g} in the group buffer; if any maildirs have been removed or added, @code{nnmaildir} notices at these times. The value of the @code{directory} parameter should be a Lisp form which is processed by @code{eval} and @code{expand-file-name} to get the path of the directory for this server. The form is @code{eval}ed only when the server is opened; the resulting string is used until the server is closed. (If you don't know about forms and @code{eval}, don't worry---a simple string will work.) This parameter is not optional; you must specify it. I don't recommend using @code{"~/Mail"} or a subdirectory of it; several other parts of Gnus use that directory by default for various things, and may get confused if @code{nnmaildir} uses it too. @code{"~/.nnmaildir"} is a typical value. @item target-prefix This should be a Lisp form which is processed by @code{eval} and @code{expand-file-name}. The form is @code{eval}ed only when the server is opened; the resulting string is used until the server is closed. When you create a group on an @code{nnmaildir} server, the maildir is created with @code{target-prefix} prepended to its name, and a symlink pointing to that maildir is created, named with the plain group name. So if @code{directory} is @code{"~/.nnmaildir"} and @code{target-prefix} is @code{"../maildirs/"}, then when you create the group @code{foo}, @code{nnmaildir} will create @file{~/.nnmaildir/../maildirs/foo} as a maildir, and will create @file{~/.nnmaildir/foo} as a symlink pointing to @file{../maildirs/foo}. You can set @code{target-prefix} to a string without any slashes to create both maildirs and symlinks in the same @code{directory}; in this case, any maildirs found in @code{directory} whose names start with @code{target-prefix} will not be listed as groups (but the symlinks pointing to them will be). As a special case, if @code{target-prefix} is @code{""} (the default), then when you create a group, the maildir will be created in @code{directory} without a corresponding symlink. Beware that you cannot use @code{gnus-group-delete-group} on such groups without the @code{force} argument. @item directory-files This should be a function with the same interface as @code{directory-files} (such as @code{directory-files} itself). It is used to scan the server's @code{directory} for maildirs. This parameter is optional; the default is @code{nnheader-directory-files-safe} if @code{nnheader-directory-files-is-safe} is @code{nil}, and @code{directory-files} otherwise. (@code{nnheader-directory-files-is-safe} is checked only once when the server is opened; if you want to check it each time the directory is scanned, you'll have to provide your own function that does that.) @item get-new-mail If non-@code{nil}, then after scanning for new mail in the group maildirs themselves as usual, this server will also incorporate mail the conventional Gnus way, from @code{mail-sources} according to @code{nnmail-split-methods} or @code{nnmail-split-fancy}. The default value is @code{nil}. Do @emph{not} use the same maildir both in @code{mail-sources} and as an @code{nnmaildir} group. The results might happen to be useful, but that would be by chance, not by design, and the results might be different in the future. If your split rules create new groups, remember to supply a @code{create-directory} server parameter. @end table @subsubsection Group parameters @code{nnmaildir} uses several group parameters. It's safe to ignore all this; the default behavior for @code{nnmaildir} is the same as the default behavior for other mail back ends: articles are deleted after one week, etc. Except for the expiry parameters, all this functionality is unique to @code{nnmaildir}, so you can ignore it if you're just trying to duplicate the behavior you already have with another back end. If the value of any of these parameters is a vector, the first element is evaluated as a Lisp form and the result is used, rather than the original value. If the value is not a vector, the value itself is evaluated as a Lisp form. (This is why these parameters use names different from those of other, similar parameters supported by other back ends: they have different, though similar, meanings.) (For numbers, strings, @code{nil}, and @code{t}, you can ignore the @code{eval} business again; for other values, remember to use an extra quote and wrap the value in a vector when appropriate.) @table @code @item expire-age An integer specifying the minimum age, in seconds, of an article before it will be expired, or the symbol @code{never} to specify that articles should never be expired. If this parameter is not set, @code{nnmaildir} falls back to the usual @code{nnmail-expiry-wait}(@code{-function}) variables (the @code{expiry-wait} group parameter overrides @code{nnmail-expiry-wait} and makes @code{nnmail-expiry-wait-function} ineffective). If you wanted a value of 3 days, you could use something like @code{[(* 3 24 60 60)]}; @code{nnmaildir} will evaluate the form and use the result. An article's age is measured starting from the article file's modification time. Normally, this is the same as the article's delivery time, but editing an article makes it younger. Moving an article (other than via expiry) may also make an article younger. @item expire-group If this is set to a string such as a full Gnus group name, like @example "backend+server.address.string:group.name" @end example and if it is not the name of the same group that the parameter belongs to, then articles will be moved to the specified group during expiry before being deleted. @emph{If this is set to an @code{nnmaildir} group, the article will be just as old in the destination group as it was in the source group.} So be careful with @code{expire-age} in the destination group. If this is set to the name of the same group that the parameter belongs to, then the article is not expired at all. If you use the vector form, the first element is evaluated once for each article. So that form can refer to @code{nnmaildir-article-file-name}, etc., to decide where to put the article. @emph{Even if this parameter is not set, @code{nnmaildir} does not fall back to the @code{expiry-target} group parameter or the @code{nnmail-expiry-target} variable.} @item read-only If this is set to @code{t}, @code{nnmaildir} will treat the articles in this maildir as read-only. This means: articles are not renamed from @file{new/} into @file{cur/}; articles are only found in @file{new/}, not @file{cur/}; articles are never deleted; articles cannot be edited. @file{new/} is expected to be a symlink to the @file{new/} directory of another maildir---e.g., a system-wide mailbox containing a mailing list of common interest. Everything in the maildir outside @file{new/} is @emph{not} treated as read-only, so for a shared mailbox, you do still need to set up your own maildir (or have write permission to the shared mailbox); your maildir just won't contain extra copies of the articles. @item directory-files A function with the same interface as @code{directory-files}. It is used to scan the directories in the maildir corresponding to this group to find articles. The default is the function specified by the server's @code{directory-files} parameter. @item distrust-Lines: If non-@code{nil}, @code{nnmaildir} will always count the lines of an article, rather than use the @code{Lines:} header field. If @code{nil}, the header field will be used if present. @item always-marks A list of mark symbols, such as @code{['(read expire)]}. Whenever Gnus asks @code{nnmaildir} for article marks, @code{nnmaildir} will say that all articles have these marks, regardless of whether the marks stored in the filesystem say so. This is a proof-of-concept feature that will probably be removed eventually; it ought to be done in Gnus proper, or abandoned if it's not worthwhile. @item never-marks A list of mark symbols, such as @code{['(tick expire)]}. Whenever Gnus asks @code{nnmaildir} for article marks, @code{nnmaildir} will say that no articles have these marks, regardless of whether the marks stored in the filesystem say so. @code{never-marks} overrides @code{always-marks}. This is a proof-of-concept feature that will probably be removed eventually; it ought to be done in Gnus proper, or abandoned if it's not worthwhile. @item nov-cache-size An integer specifying the size of the @acronym{NOV} memory cache. To speed things up, @code{nnmaildir} keeps @acronym{NOV} data in memory for a limited number of articles in each group. (This is probably not worthwhile, and will probably be removed in the future.) This parameter's value is noticed only the first time a group is seen after the server is opened---i.e., when you first start Gnus, typically. The @acronym{NOV} cache is never resized until the server is closed and reopened. The default is an estimate of the number of articles that would be displayed in the summary buffer: a count of articles that are either marked with @code{tick} or not marked with @code{read}, plus a little extra. @end table @subsubsection Article identification Articles are stored in the @file{cur/} subdirectory of each maildir. Each article file is named like @code{uniq:info}, where @code{uniq} contains no colons. @code{nnmaildir} ignores, but preserves, the @code{:info} part. (Other maildir readers typically use this part of the filename to store marks.) The @code{uniq} part uniquely identifies the article, and is used in various places in the @file{.nnmaildir/} subdirectory of the maildir to store information about the corresponding article. The full pathname of an article is available in the variable @code{nnmaildir-article-file-name} after you request the article in the summary buffer. @subsubsection NOV data An article identified by @code{uniq} has its @acronym{NOV} data (used to generate lines in the summary buffer) stored in @code{.nnmaildir/nov/uniq}. There is no @code{nnmaildir-generate-nov-databases} function. (There isn't much need for it---an article's @acronym{NOV} data is updated automatically when the article or @code{nnmail-extra-headers} has changed.) You can force @code{nnmaildir} to regenerate the @acronym{NOV} data for a single article simply by deleting the corresponding @acronym{NOV} file, but @emph{beware}: this will also cause @code{nnmaildir} to assign a new article number for this article, which may cause trouble with @code{seen} marks, the Agent, and the cache. @subsubsection Article marks An article identified by @code{uniq} is considered to have the mark @code{flag} when the file @file{.nnmaildir/marks/flag/uniq} exists. When Gnus asks @code{nnmaildir} for a group's marks, @code{nnmaildir} looks for such files and reports the set of marks it finds. When Gnus asks @code{nnmaildir} to store a new set of marks, @code{nnmaildir} creates and deletes the corresponding files as needed. (Actually, rather than create a new file for each mark, it just creates hard links to @file{.nnmaildir/markfile}, to save inodes.) You can invent new marks by creating a new directory in @file{.nnmaildir/marks/}. You can tar up a maildir and remove it from your server, untar it later, and keep your marks. You can add and remove marks yourself by creating and deleting mark files. If you do this while Gnus is running and your @code{nnmaildir} server is open, it's best to exit all summary buffers for @code{nnmaildir} groups and type @kbd{s} in the group buffer first, and to type @kbd{g} or @kbd{M-g} in the group buffer afterwards. Otherwise, Gnus might not pick up the changes, and might undo them. @node Mail Folders @subsubsection Mail Folders @cindex nnfolder @cindex mbox folders @cindex mail folders @code{nnfolder} is a back end for storing each mail group in a separate file. Each file is in the standard Un*x mbox format. @code{nnfolder} will add extra headers to keep track of article numbers and arrival dates. @cindex self contained nnfolder servers @cindex marks When the marks file is used (which it is by default), @code{nnfolder} servers have the property that you may backup them using @code{tar} or similar, and later be able to restore them into Gnus (by adding the proper @code{nnfolder} server) and have all your marks be preserved. Marks for a group are usually stored in a file named as the mbox file with @code{.mrk} concatenated to it (but see @code{nnfolder-marks-file-suffix}) within the @code{nnfolder} directory. Individual @code{nnfolder} groups are also possible to backup, use @kbd{G m} to restore the group (after restoring the backup into the @code{nnfolder} directory). Virtual server settings: @table @code @item nnfolder-directory @vindex nnfolder-directory All the @code{nnfolder} mail boxes will be stored under this directory. The default is the value of @code{message-directory} (whose default is @file{~/Mail}) @item nnfolder-active-file @vindex nnfolder-active-file The name of the active file. The default is @file{~/Mail/active}. @item nnfolder-newsgroups-file @vindex nnfolder-newsgroups-file The name of the group descriptions file. @xref{Newsgroups File Format}. The default is @file{~/Mail/newsgroups} @item nnfolder-get-new-mail @vindex nnfolder-get-new-mail If non-@code{nil}, @code{nnfolder} will read incoming mail. The default is @code{t} @item nnfolder-save-buffer-hook @vindex nnfolder-save-buffer-hook @cindex backup files Hook run before saving the folders. Note that Emacs does the normal backup renaming of files even with the @code{nnfolder} buffers. If you wish to switch this off, you could say something like the following in your @file{.emacs} file: @lisp (defun turn-off-backup () (set (make-local-variable 'backup-inhibited) t)) (add-hook 'nnfolder-save-buffer-hook 'turn-off-backup) @end lisp @item nnfolder-delete-mail-hook @vindex nnfolder-delete-mail-hook Hook run in a buffer narrowed to the message that is to be deleted. This function can be used to copy the message to somewhere else, or to extract some information from it before removing it. @item nnfolder-nov-is-evil @vindex nnfolder-nov-is-evil If non-@code{nil}, this back end will ignore any @acronym{NOV} files. The default is @code{nil}. @item nnfolder-nov-file-suffix @vindex nnfolder-nov-file-suffix The extension for @acronym{NOV} files. The default is @file{.nov}. @item nnfolder-nov-directory @vindex nnfolder-nov-directory The directory where the @acronym{NOV} files should be stored. If @code{nil}, @code{nnfolder-directory} is used. @item nnfolder-marks-is-evil @vindex nnfolder-marks-is-evil If non-@code{nil}, this back end will ignore any @sc{marks} files. The default is @code{nil}. @item nnfolder-marks-file-suffix @vindex nnfolder-marks-file-suffix The extension for @sc{marks} files. The default is @file{.mrk}. @item nnfolder-marks-directory @vindex nnfolder-marks-directory The directory where the @sc{marks} files should be stored. If @code{nil}, @code{nnfolder-directory} is used. @end table @findex nnfolder-generate-active-file @kindex M-x nnfolder-generate-active-file If you have lots of @code{nnfolder}-like files you'd like to read with @code{nnfolder}, you can use the @kbd{M-x nnfolder-generate-active-file} command to make @code{nnfolder} aware of all likely files in @code{nnfolder-directory}. This only works if you use long file names, though. @node Comparing Mail Back Ends @subsubsection Comparing Mail Back Ends First, just for terminology, the @dfn{back end} is the common word for a low-level access method---a transport, if you will, by which something is acquired. The sense is that one's mail has to come from somewhere, and so selection of a suitable back end is required in order to get that mail within spitting distance of Gnus. The same concept exists for Usenet itself: Though access to articles is typically done by @acronym{NNTP} these days, once upon a midnight dreary, everyone in the world got at Usenet by running a reader on the machine where the articles lay (the machine which today we call an @acronym{NNTP} server), and access was by the reader stepping into the articles' directory spool area directly. One can still select between either the @code{nntp} or @code{nnspool} back ends, to select between these methods, if one happens actually to live on the server (or can see its spool directly, anyway, via NFS). The goal in selecting a mail back end is to pick one which simultaneously represents a suitable way of dealing with the original format plus leaving mail in a form that is convenient to use in the future. Here are some high and low points on each: @table @code @item nnmbox UNIX systems have historically had a single, very common, and well- defined format. All messages arrive in a single @dfn{spool file}, and they are delineated by a line whose regular expression matches @samp{^From_}. (My notational use of @samp{_} is to indicate a space, to make it clear in this instance that this is not the RFC-specified @samp{From:} header.) Because Emacs and therefore Gnus emanate historically from the Unix environment, it is simplest if one does not mess a great deal with the original mailbox format, so if one chooses this back end, Gnus' primary activity in getting mail from the real spool area to Gnus' preferred directory is simply to copy it, with no (appreciable) format change in the process. It is the dumbest'' way to move mail into availability in the Gnus environment. This makes it fast to move into place, but slow to parse, when Gnus has to look at what's where. @item nnbabyl Once upon a time, there was the DEC-10 and DEC-20, running operating systems called TOPS and related things, and the usual (only?) mail reading environment was a thing called Babyl. I don't know what format was used for mail landing on the system, but Babyl had its own internal format to which mail was converted, primarily involving creating a spool-file-like entity with a scheme for inserting Babyl-specific headers and status bits above the top of each message in the file. Rmail was Emacs' first mail reader, it was written by Richard Stallman, and Stallman came out of that TOPS/Babyl environment, so he wrote Rmail to understand the mail files folks already had in existence. Gnus (and VM, for that matter) continue to support this format because it's perceived as having some good qualities in those mailer-specific headers/status bits stuff. Rmail itself still exists as well, of course, and is still maintained by Stallman. Both of the above forms leave your mail in a single file on your file system, and they must parse that entire file each time you take a look at your mail. @item nnml @code{nnml} is the back end which smells the most as though you were actually operating with an @code{nnspool}-accessed Usenet system. (In fact, I believe @code{nnml} actually derived from @code{nnspool} code, lo these years ago.) One's mail is taken from the original spool file, and is then cut up into individual message files, 1:1. It maintains a Usenet-style active file (analogous to what one finds in an INN- or CNews-based news system in (for instance) @file{/var/lib/news/active}, or what is returned via the @samp{NNTP LIST} verb) and also creates @dfn{overview} files for efficient group entry, as has been defined for @acronym{NNTP} servers for some years now. It is slower in mail-splitting, due to the creation of lots of files, updates to the @code{nnml} active file, and additions to overview files on a per-message basis, but it is extremely fast on access because of what amounts to the indexing support provided by the active file and overviews. @code{nnml} costs @dfn{inodes} in a big way; that is, it soaks up the resource which defines available places in the file system to put new files. Sysadmins take a dim view of heavy inode occupation within tight, shared file systems. But if you live on a personal machine where the file system is your own and space is not at a premium, @code{nnml} wins big. It is also problematic using this back end if you are living in a FAT16-based Windows world, since much space will be wasted on all these tiny files. @item nnmh The Rand MH mail-reading system has been around UNIX systems for a very long time; it operates by splitting one's spool file of messages into individual files, but with little or no indexing support---@code{nnmh} is considered to be semantically equivalent to @code{nnml} without active file or overviews''. This is arguably the worst choice, because one gets the slowness of individual file creation married to the slowness of access parsing when learning what's new in one's groups. @item nnfolder Basically the effect of @code{nnfolder} is @code{nnmbox} (the first method described above) on a per-group basis. That is, @code{nnmbox} itself puts @emph{all} one's mail in one file; @code{nnfolder} provides a little bit of optimization to this so that each of one's mail groups has a Unix mail box file. It's faster than @code{nnmbox} because each group can be parsed separately, and still provides the simple Unix mail box format requiring minimal effort in moving the mail around. In addition, it maintains an active'' file making it much faster for Gnus to figure out how many messages there are in each separate group. If you have groups that are expected to have a massive amount of messages, @code{nnfolder} is not the best choice, but if you receive only a moderate amount of mail, @code{nnfolder} is probably the most friendly mail back end all over. @item nnmaildir For configuring expiry and other things, @code{nnmaildir} uses incompatible group parameters, slightly different from those of other mail back ends. @code{nnmaildir} is largely similar to @code{nnml}, with some notable differences. Each message is stored in a separate file, but the filename is unrelated to the article number in Gnus. @code{nnmaildir} also stores the equivalent of @code{nnml}'s overview files in one file per article, so it uses about twice as many inodes as @code{nnml}. (Use @code{df -i} to see how plentiful your inode supply is.) If this slows you down or takes up very much space, consider switching to @uref{http://www.namesys.com/, ReiserFS} or another non-block-structured file system. Since maildirs don't require locking for delivery, the maildirs you use as groups can also be the maildirs your mail is directly delivered to. This means you can skip Gnus' mail splitting if your mail is already organized into different mailboxes during delivery. A @code{directory} entry in @code{mail-sources} would have a similar effect, but would require one set of mailboxes for spooling deliveries (in mbox format, thus damaging message bodies), and another set to be used as groups (in whatever format you like). A maildir has a built-in spool, in the @code{new/} subdirectory. Beware that currently, mail moved from @code{new/} to @code{cur/} instead of via mail splitting will not undergo treatment such as duplicate checking. @code{nnmaildir} stores article marks for a given group in the corresponding maildir, in a way designed so that it's easy to manipulate them from outside Gnus. You can tar up a maildir, unpack it somewhere else, and still have your marks. @code{nnml} also stores marks, but it's not as easy to work with them from outside Gnus as with @code{nnmaildir}. @code{nnmaildir} uses a significant amount of memory to speed things up. (It keeps in memory some of the things that @code{nnml} stores in files and that @code{nnmh} repeatedly parses out of message files.) If this is a problem for you, you can set the @code{nov-cache-size} group parameter to something small (0 would probably not work, but 1 probably would) to make it use less memory. This caching will probably be removed in the future. Startup is likely to be slower with @code{nnmaildir} than with other back ends. Everything else is likely to be faster, depending in part on your file system. @code{nnmaildir} does not use @code{nnoo}, so you cannot use @code{nnoo} to write an @code{nnmaildir}-derived back end. @end table @node Browsing the Web @section Browsing the Web @cindex web @cindex browsing the web @cindex www @cindex http Web-based discussion forums are getting more and more popular. On many subjects, the web-based forums have become the most important forums, eclipsing the importance of mailing lists and news groups. The reason is easy to understand---they are friendly to new users; you just point and click, and there's the discussion. With mailing lists, you have to go through a cumbersome subscription procedure, and most people don't even know what a news group is. The problem with this scenario is that web browsers are not very good at being newsreaders. They do not keep track of what articles you've read; they do not allow you to score on subjects you're interested in; they do not allow off-line browsing; they require you to click around and drive you mad in the end. So---if web browsers suck at reading discussion forums, why not use Gnus to do it instead? Gnus has been getting a bit of a collection of back ends for providing interfaces to these sources. @menu * Archiving Mail:: * Web Searches:: Creating groups from articles that match a string. * Slashdot:: Reading the Slashdot comments. * Ultimate:: The Ultimate Bulletin Board systems. * Web Archive:: Reading mailing list archived on web. * RSS:: Reading RDF site summary. * Customizing W3:: Doing stuff to Emacs/W3 from Gnus. @end menu All the web sources require Emacs/W3 and the url library or those alternatives to work. The main caveat with all these web sources is that they probably won't work for a very long time. Gleaning information from the @acronym{HTML} data is guesswork at best, and when the layout is altered, the Gnus back end will fail. If you have reasonably new versions of these back ends, though, you should be ok. One thing all these Web methods have in common is that the Web sources are often down, unavailable or just plain too slow to be fun. In those cases, it makes a lot of sense to let the Gnus Agent (@pxref{Gnus Unplugged}) handle downloading articles, and then you can read them at leisure from your local disk. No more World Wide Wait for you. @node Archiving Mail @subsection Archiving Mail @cindex archiving mail @cindex backup of mail Some of the back ends, notably @code{nnml}, @code{nnfolder}, and @code{nnmaildir}, now actually store the article marks with each group. For these servers, archiving and restoring a group while preserving marks is fairly simple. (Preserving the group level and group parameters as well still requires ritual dancing and sacrifices to the @file{.newsrc.eld} deity though.) To archive an entire @code{nnml}, @code{nnfolder}, or @code{nnmaildir} server, take a recursive copy of the server directory. There is no need to shut down Gnus, so archiving may be invoked by @code{cron} or similar. You restore the data by restoring the directory tree, and adding a server definition pointing to that directory in Gnus. The @ref{Article Backlog}, @ref{Asynchronous Fetching} and other things might interfere with overwriting data, so you may want to shut down Gnus before you restore the data. It is also possible to archive individual @code{nnml}, @code{nnfolder}, or @code{nnmaildir} groups, while preserving marks. For @code{nnml} or @code{nnmaildir}, you copy all files in the group's directory. For @code{nnfolder} you need to copy both the base folder file itself (@file{FOO}, say), and the marks file (@file{FOO.mrk} in this example). Restoring the group is done with @kbd{G m} from the Group buffer. The last step makes Gnus notice the new directory. @code{nnmaildir} notices the new directory automatically, so @kbd{G m} is unnecessary in that case. @node Web Searches @subsection Web Searches @cindex nnweb @cindex Google @cindex dejanews @cindex gmane @cindex Usenet searches @cindex searching the Usenet It's, like, too neat to search the Usenet for articles that match a string, but it, like, totally @emph{sucks}, like, totally, to use one of those, like, Web browsers, and you, like, have to, rilly, like, look at the commercials, so, like, with Gnus you can do @emph{rad}, rilly, searches without having to use a browser. The @code{nnweb} back end allows an easy interface to the mighty search engine. You create an @code{nnweb} group, enter a search pattern, and then enter the group and read the articles like you would any normal group. The @kbd{G w} command in the group buffer (@pxref{Foreign Groups}) will do this in an easy-to-use fashion. @code{nnweb} groups don't really lend themselves to being solid groups---they have a very fleeting idea of article numbers. In fact, each time you enter an @code{nnweb} group (not even changing the search pattern), you are likely to get the articles ordered in a different manner. Not even using duplicate suppression (@pxref{Duplicate Suppression}) will help, since @code{nnweb} doesn't even know the @code{Message-ID} of the articles before reading them using some search engines (Google, for instance). The only possible way to keep track of which articles you've read is by scoring on the @code{Date} header---mark all articles posted before the last date you read the group as read. If the search engine changes its output substantially, @code{nnweb} won't be able to parse it and will fail. One could hardly fault the Web providers if they were to do this---their @emph{raison d'être} is to make money off of advertisements, not to provide services to the community. Since @code{nnweb} washes the ads off all the articles, one might think that the providers might be somewhat miffed. We'll see. You must have the @code{url} and @code{W3} package or those alternatives (try @code{customize-group} on the @samp{mm-url} variable group) installed to be able to use @code{nnweb}. Virtual server variables: @table @code @item nnweb-type @vindex nnweb-type What search engine type is being used. The currently supported types are @code{google}, @code{dejanews}, and @code{gmane}. Note that @code{dejanews} is an alias to @code{google}. @item nnweb-search @vindex nnweb-search The search string to feed to the search engine. @item nnweb-max-hits @vindex nnweb-max-hits Advisory maximum number of hits per search to display. The default is 999. @item nnweb-type-definition @vindex nnweb-type-definition Type-to-definition alist. This alist says what @code{nnweb} should do with the various search engine types. The following elements must be present: @table @code @item article Function to decode the article and provide something that Gnus understands. @item map Function to create an article number to message header and URL alist. @item search Function to send the search string to the search engine. @item address The address the aforementioned function should send the search string to. @item id Format string URL to fetch an article by @code{Message-ID}. @end table @end table @node Slashdot @subsection Slashdot @cindex Slashdot @cindex nnslashdot @uref{http://slashdot.org/, Slashdot} is a popular news site, with lively discussion following the news articles. @code{nnslashdot} will let you read this forum in a convenient manner. The easiest way to read this source is to put something like the following in your @file{~/.gnus.el} file: @lisp (setq gnus-secondary-select-methods '((nnslashdot ""))) @end lisp This will make Gnus query the @code{nnslashdot} back end for new comments and groups. The @kbd{F} command will subscribe each new news article as a new Gnus group, and you can read the comments by entering these groups. (Note that the default subscription method is to subscribe new groups as zombies. Other methods are available (@pxref{Subscription Methods}). If you want to remove an old @code{nnslashdot} group, the @kbd{G DEL} command is the most handy tool (@pxref{Foreign Groups}). When following up to @code{nnslashdot} comments (or posting new comments), some light @acronym{HTML}izations will be performed. In particular, text quoted with @samp{> } will be quoted with @samp{blockquote} instead, and signatures will have @samp{br} added to the end of each line. Other than that, you can just write @acronym{HTML} directly into the message buffer. Note that Slashdot filters out some @acronym{HTML} forms. The following variables can be altered to change its behavior: @table @code @item nnslashdot-threaded Whether @code{nnslashdot} should display threaded groups or not. The default is @code{t}. To be able to display threads, @code{nnslashdot} has to retrieve absolutely all comments in a group upon entry. If a threaded display is not required, @code{nnslashdot} will only retrieve the comments that are actually wanted by the user. Threading is nicer, but much, much slower than unthreaded. @item nnslashdot-login-name @vindex nnslashdot-login-name The login name to use when posting. @item nnslashdot-password @vindex nnslashdot-password The password to use when posting. @item nnslashdot-directory @vindex nnslashdot-directory Where @code{nnslashdot} will store its files. The default is @file{~/News/slashdot/}. @item nnslashdot-active-url @vindex nnslashdot-active-url The @acronym{URL} format string that will be used to fetch the information on news articles and comments. The default is@* @samp{http://slashdot.org/search.pl?section=&min=%d}. @item nnslashdot-comments-url @vindex nnslashdot-comments-url The @acronym{URL} format string that will be used to fetch comments. @item nnslashdot-article-url @vindex nnslashdot-article-url The @acronym{URL} format string that will be used to fetch the news article. The default is @samp{http://slashdot.org/article.pl?sid=%s&mode=nocomment}. @item nnslashdot-threshold @vindex nnslashdot-threshold The score threshold. The default is -1. @item nnslashdot-group-number @vindex nnslashdot-group-number The number of old groups, in addition to the ten latest, to keep updated. The default is 0. @end table @node Ultimate @subsection Ultimate @cindex nnultimate @cindex Ultimate Bulletin Board @uref{http://www.ultimatebb.com/, The Ultimate Bulletin Board} is probably the most popular Web bulletin board system used. It has a quite regular and nice interface, and it's possible to get the information Gnus needs to keep groups updated. The easiest way to get started with @code{nnultimate} is to say something like the following in the group buffer: @kbd{B nnultimate RET http://www.tcj.com/messboard/ubbcgi/ RET}. (Substitute the @acronym{URL} (not including @samp{Ultimate.cgi} or the like at the end) for a forum you're interested in; there's quite a list of them on the Ultimate web site.) Then subscribe to the groups you're interested in from the server buffer, and read them from the group buffer. The following @code{nnultimate} variables can be altered: @table @code @item nnultimate-directory @vindex nnultimate-directory The directory where @code{nnultimate} stores its files. The default is@* @file{~/News/ultimate/}. @end table @node Web Archive @subsection Web Archive @cindex nnwarchive @cindex Web Archive Some mailing lists only have archives on Web servers, such as @uref{http://www.egroups.com/} and @uref{http://www.mail-archive.com/}. It has a quite regular and nice interface, and it's possible to get the information Gnus needs to keep groups updated. @findex gnus-group-make-warchive-group The easiest way to get started with @code{nnwarchive} is to say something like the following in the group buffer: @kbd{M-x gnus-group-make-warchive-group RET @var{an_egroup} RET egroups RET www.egroups.com RET @var{your@@email.address} RET}. (Substitute the @var{an_egroup} with the mailing list you subscribed, the @var{your@@email.address} with your email address.), or to browse the back end by @kbd{B nnwarchive RET mail-archive RET}. The following @code{nnwarchive} variables can be altered: @table @code @item nnwarchive-directory @vindex nnwarchive-directory The directory where @code{nnwarchive} stores its files. The default is@* @file{~/News/warchive/}. @item nnwarchive-login @vindex nnwarchive-login The account name on the web server. @item nnwarchive-passwd @vindex nnwarchive-passwd The password for your account on the web server. @end table @node RSS @subsection RSS @cindex nnrss @cindex RSS Some web sites have an RDF Site Summary (@acronym{RSS}). @acronym{RSS} is a format for summarizing headlines from news related sites (such as BBC or CNN). But basically anything list-like can be presented as an @acronym{RSS} feed: weblogs, changelogs or recent changes to a wiki (e.g. @url{http://cliki.net/recent-changes.rdf}). @acronym{RSS} has a quite regular and nice interface, and it's possible to get the information Gnus needs to keep groups updated. Note: you had better use Emacs which supports the @code{utf-8} coding system because @acronym{RSS} uses UTF-8 for encoding non-@acronym{ASCII} text by default. It is also used by default for non-@acronym{ASCII} group names. @kindex G R (Group) Use @kbd{G R} from the group buffer to subscribe to a feed---you will be prompted for the location, the title and the description of the feed. The title, which allows any characters, will be used for the group name and the name of the group data file. The description can be omitted. An easy way to get started with @code{nnrss} is to say something like the following in the group buffer: @kbd{B nnrss RET RET y}, then subscribe to groups. The @code{nnrss} back end saves the group data file in @code{nnrss-directory} (see below) for each @code{nnrss} group. File names containing non-@acronym{ASCII} characters will be encoded by the coding system specified with the @code{nnmail-pathname-coding-system} variable. If it is @code{nil}, in Emacs the coding system defaults to the value of @code{default-file-name-coding-system}. If you are using XEmacs and want to use non-@acronym{ASCII} group names, you should set the value for the @code{nnmail-pathname-coding-system} variable properly. The @code{nnrss} back end generates @samp{multipart/alternative} @acronym{MIME} articles in which each contains a @samp{text/plain} part and a @samp{text/html} part. @cindex OPML You can also use the following commands to import and export your subscriptions from a file in @acronym{OPML} format (Outline Processor Markup Language). @defun nnrss-opml-import file Prompt for an @acronym{OPML} file, and subscribe to each feed in the file. @end defun @defun nnrss-opml-export Write your current @acronym{RSS} subscriptions to a buffer in @acronym{OPML} format. @end defun The following @code{nnrss} variables can be altered: @table @code @item nnrss-directory @vindex nnrss-directory The directory where @code{nnrss} stores its files. The default is @file{~/News/rss/}. @item nnrss-file-coding-system @vindex nnrss-file-coding-system The coding system used when reading and writing the @code{nnrss} groups data files. The default is the value of @code{mm-universal-coding-system} (which defaults to @code{emacs-mule} in Emacs or @code{escape-quoted} in XEmacs). @item nnrss-use-local @vindex nnrss-use-local @findex nnrss-generate-download-script If you set @code{nnrss-use-local} to @code{t}, @code{nnrss} will read the feeds from local files in @code{nnrss-directory}. You can use the command @code{nnrss-generate-download-script} to generate a download script using @command{wget}. @item nnrss-wash-html-in-text-plain-parts Non-@code{nil} means that @code{nnrss} renders text in @samp{text/plain} parts as @acronym{HTML}. The function specified by the @code{mm-text-html-renderer} variable (@pxref{Display Customization, ,Display Customization, emacs-mime, The Emacs MIME Manual}) will be used to render text. If it is @code{nil}, which is the default, text will simply be folded. Leave it @code{nil} if you prefer to see @samp{text/html} parts. @end table The following code may be helpful, if you want to show the description in the summary buffer. @lisp (add-to-list 'nnmail-extra-headers nnrss-description-field) (setq gnus-summary-line-format "%U%R%z%I%(%[%4L: %-15,15f%]%) %s%uX\n") (defun gnus-user-format-function-X (header) (let ((descr (assq nnrss-description-field (mail-header-extra header)))) (if descr (concat "\n\t" (cdr descr)) ""))) @end lisp The following code may be useful to open an nnrss url directly from the summary buffer. @lisp (require 'browse-url) (defun browse-nnrss-url( arg ) (interactive "p") (let ((url (assq nnrss-url-field (mail-header-extra (gnus-data-header (assq (gnus-summary-article-number) gnus-newsgroup-data)))))) (if url (progn (browse-url (cdr url)) (gnus-summary-mark-as-read-forward 1)) (gnus-summary-scroll-up arg)))) (eval-after-load "gnus" #'(define-key gnus-summary-mode-map (kbd "<RET>") 'browse-nnrss-url)) (add-to-list 'nnmail-extra-headers nnrss-url-field) @end lisp Even if you have added @code{"text/html"} to the @code{mm-discouraged-alternatives} variable (@pxref{Display Customization, ,Display Customization, emacs-mime, The Emacs MIME Manual}) since you don't want to see @acronym{HTML} parts, it might be more useful especially in @code{nnrss} groups to display @samp{text/html} parts. Here's an example of setting @code{mm-discouraged-alternatives} as a group parameter (@pxref{Group Parameters}) in order to display @samp{text/html} parts only in @code{nnrss} groups: @lisp ;; @r{Set the default value of @code{mm-discouraged-alternatives}.} (eval-after-load "gnus-sum" '(add-to-list 'gnus-newsgroup-variables '(mm-discouraged-alternatives . '("text/html" "image/.*")))) ;; @r{Display @samp{text/html} parts in @code{nnrss} groups.} (add-to-list 'gnus-parameters '("\\nnrss:" (mm-discouraged-alternatives nil))) @end lisp @node Customizing W3 @subsection Customizing W3 @cindex W3 @cindex html @cindex url @cindex Netscape Gnus uses the url library to fetch web pages and Emacs/W3 (or those alternatives) to display web pages. Emacs/W3 is documented in its own manual, but there are some things that may be more relevant for Gnus users. For instance, a common question is how to make Emacs/W3 follow links using the @code{browse-url} functions (which will call some external web browser like Netscape). Here's one way: @lisp (eval-after-load "w3" '(progn (fset 'w3-fetch-orig (symbol-function 'w3-fetch)) (defun w3-fetch (&optional url target) (interactive (list (w3-read-url-with-default))) (if (eq major-mode 'gnus-article-mode) (browse-url url) (w3-fetch-orig url target))))) @end lisp Put that in your @file{.emacs} file, and hitting links in W3-rendered @acronym{HTML} in the Gnus article buffers will use @code{browse-url} to follow the link. @node IMAP @section IMAP @cindex nnimap @cindex @acronym{IMAP} @acronym{IMAP} is a network protocol for reading mail (or news, or @dots{}), think of it as a modernized @acronym{NNTP}. Connecting to a @acronym{IMAP} server is much similar to connecting to a news server, you just specify the network address of the server. @acronym{IMAP} has two properties. First, @acronym{IMAP} can do everything that @acronym{POP} can, it can hence be viewed as a @acronym{POP++}. Secondly, @acronym{IMAP} is a mail storage protocol, similar to @acronym{NNTP} being a news storage protocol---however, @acronym{IMAP} offers more features than @acronym{NNTP} because news is more or less read-only whereas mail is read-write. If you want to use @acronym{IMAP} as a @acronym{POP++}, use an imap entry in @code{mail-sources}. With this, Gnus will fetch mails from the @acronym{IMAP} server and store them on the local disk. This is not the usage described in this section---@xref{Mail Sources}. If you want to use @acronym{IMAP} as a mail storage protocol, use an nnimap entry in @code{gnus-secondary-select-methods}. With this, Gnus will manipulate mails stored on the @acronym{IMAP} server. This is the kind of usage explained in this section. A server configuration in @file{~/.gnus.el} with a few @acronym{IMAP} servers might look something like the following. (Note that for @acronym{TLS}/@acronym{SSL}, you need external programs and libraries, see below.) @lisp (setq gnus-secondary-select-methods '((nnimap "simpleserver") ; @r{no special configuration} ; @r{perhaps a ssh port forwarded server:} (nnimap "dolk" (nnimap-address "localhost") (nnimap-server-port 1430)) ; @r{a UW server running on localhost} (nnimap "barbar" (nnimap-server-port 143) (nnimap-address "localhost") (nnimap-list-pattern ("INBOX" "mail/*"))) ; @r{anonymous public cyrus server:} (nnimap "cyrus.andrew.cmu.edu" (nnimap-authenticator anonymous) (nnimap-list-pattern "archive.*") (nnimap-stream network)) ; @r{a ssl server on a non-standard port:} (nnimap "vic20" (nnimap-address "vic20.somewhere.com") (nnimap-server-port 9930) (nnimap-stream ssl)))) @end lisp After defining the new server, you can subscribe to groups on the server using normal Gnus commands such as @kbd{U} in the Group Buffer (@pxref{Subscription Commands}) or via the Server Buffer (@pxref{Server Buffer}). The following variables can be used to create a virtual @code{nnimap} server: @table @code @item nnimap-address @vindex nnimap-address The address of the remote @acronym{IMAP} server. Defaults to the virtual server name if not specified. @item nnimap-server-port @vindex nnimap-server-port Port on server to contact. Defaults to port 143, or 993 for @acronym{TLS}/@acronym{SSL}. Note that this should be an integer, example server specification: @lisp (nnimap "mail.server.com" (nnimap-server-port 4711)) @end lisp @item nnimap-list-pattern @vindex nnimap-list-pattern String or list of strings of mailboxes to limit available groups to. This is used when the server has very many mailboxes and you're only interested in a few---some servers export your home directory via @acronym{IMAP}, you'll probably want to limit the mailboxes to those in @file{~/Mail/*} then. The string can also be a cons of REFERENCE and the string as above, what REFERENCE is used for is server specific, but on the University of Washington server it's a directory that will be concatenated with the mailbox. Example server specification: @lisp (nnimap "mail.server.com" (nnimap-list-pattern ("INBOX" "Mail/*" "alt.sex.*" ("~friend/Mail/" . "list/*")))) @end lisp @item nnimap-stream @vindex nnimap-stream The type of stream used to connect to your server. By default, nnimap will detect and automatically use all of the below, with the exception of @acronym{TLS}/@acronym{SSL}. (@acronym{IMAP} over @acronym{TLS}/@acronym{SSL} is being replaced by STARTTLS, which can be automatically detected, but it's not widely deployed yet.) Example server specification: @lisp (nnimap "mail.server.com" (nnimap-stream ssl)) @end lisp Please note that the value of @code{nnimap-stream} is a symbol! @itemize @bullet @item @dfn{gssapi:} Connect with GSSAPI (usually Kerberos 5). Requires the @samp{gsasl} or @samp{imtest} program. @item @dfn{kerberos4:} Connect with Kerberos 4. Requires the @samp{imtest} program. @item @dfn{starttls:} Connect via the STARTTLS extension (similar to @acronym{TLS}/@acronym{SSL}). Requires the external library @samp{starttls.el} and program @samp{starttls}. @item @dfn{tls:} Connect through @acronym{TLS}. Requires GNUTLS (the program @samp{gnutls-cli}). @item @dfn{ssl:} Connect through @acronym{SSL}. Requires OpenSSL (the program @samp{openssl}) or SSLeay (@samp{s_client}). @item @dfn{shell:} Use a shell command to start @acronym{IMAP} connection. @item @dfn{network:} Plain, TCP/IP network connection. @end itemize @vindex imap-kerberos4-program The @samp{imtest} program is shipped with Cyrus IMAPD. If you're using @samp{imtest} from Cyrus IMAPD < 2.0.14 (which includes version 1.5.x and 1.6.x) you need to frob @code{imap-process-connection-type} to make @code{imap.el} use a pty instead of a pipe when communicating with @samp{imtest}. You will then suffer from a line length restrictions on @acronym{IMAP} commands, which might make Gnus seem to hang indefinitely if you have many articles in a mailbox. The variable @code{imap-kerberos4-program} contain parameters to pass to the imtest program. For @acronym{TLS} connection, the @code{gnutls-cli} program from GNUTLS is needed. It is available from @uref{http://www.gnu.org/software/gnutls/}. @vindex imap-gssapi-program This parameter specifies a list of command lines that invoke a GSSAPI authenticated @acronym{IMAP} stream in a subshell. They are tried sequentially until a connection is made, or the list has been exhausted. By default, @samp{gsasl} from GNU SASL, available from @uref{http://www.gnu.org/software/gsasl/}, and the @samp{imtest} program from Cyrus IMAPD (see @code{imap-kerberos4-program}), are tried. @vindex imap-ssl-program For @acronym{SSL} connections, the OpenSSL program is available from @uref{http://www.openssl.org/}. OpenSSL was formerly known as SSLeay, and nnimap support it too---although the most recent versions of SSLeay, 0.9.x, are known to have serious bugs making it useless. Earlier versions, especially 0.8.x, of SSLeay are known to work. The variable @code{imap-ssl-program} contain parameters to pass to OpenSSL/SSLeay. @vindex imap-shell-program @vindex imap-shell-host For @acronym{IMAP} connections using the @code{shell} stream, the variable @code{imap-shell-program} specify what program to call. @item nnimap-authenticator @vindex nnimap-authenticator The authenticator used to connect to the server. By default, nnimap will use the most secure authenticator your server is capable of. Example server specification: @lisp (nnimap "mail.server.com" (nnimap-authenticator anonymous)) @end lisp Please note that the value of @code{nnimap-authenticator} is a symbol! @itemize @bullet @item @dfn{gssapi:} GSSAPI (usually kerberos 5) authentication. Requires external program @code{gsasl} or @code{imtest}. @item @dfn{kerberos4:} Kerberos 4 authentication. Requires external program @code{imtest}. @item @dfn{digest-md5:} Encrypted username/password via DIGEST-MD5. Requires external library @code{digest-md5.el}. @item @dfn{cram-md5:} Encrypted username/password via CRAM-MD5. @item @dfn{login:} Plain-text username/password via LOGIN. @item @dfn{anonymous:} Login as anonymous'', supplying your email address as password. @end itemize @item nnimap-expunge-on-close @cindex expunging @vindex nnimap-expunge-on-close Unlike Parmenides the @acronym{IMAP} designers have decided things that don't exist actually do exist. More specifically, @acronym{IMAP} has this concept of marking articles @code{Deleted} which doesn't actually delete them, and this (marking them @code{Deleted}, that is) is what nnimap does when you delete an article in Gnus (with @kbd{B DEL} or similar). Since the articles aren't really removed when we mark them with the @code{Deleted} flag we'll need a way to actually delete them. Feel like running in circles yet? Traditionally, nnimap has removed all articles marked as @code{Deleted} when closing a mailbox but this is now configurable by this server variable. The possible options are: @table @code @item always The default behavior, delete all articles marked as Deleted'' when closing a mailbox. @item never Never actually delete articles. Currently there is no way of showing the articles marked for deletion in nnimap, but other @acronym{IMAP} clients may allow you to do this. If you ever want to run the EXPUNGE command manually, @xref{Expunging mailboxes}. @item ask When closing mailboxes, nnimap will ask if you wish to expunge deleted articles or not. @end table @item nnimap-importantize-dormant @vindex nnimap-importantize-dormant If non-@code{nil} (the default), marks dormant articles as ticked (as well), for other @acronym{IMAP} clients. Within Gnus, dormant articles will naturally still (only) be marked as dormant. This is to make dormant articles stand out, just like ticked articles, in other @acronym{IMAP} clients. (In other words, Gnus has two Tick'' marks and @acronym{IMAP} has only one.) Probably the only reason for frobbing this would be if you're trying enable per-user persistent dormant flags, using something like: @lisp (setcdr (assq 'dormant nnimap-mark-to-flag-alist) (format "gnus-dormant-%s" (user-login-name))) (setcdr (assq 'dormant nnimap-mark-to-predicate-alist) (format "KEYWORD gnus-dormant-%s" (user-login-name))) @end lisp In this case, you would not want the per-user dormant flag showing up as ticked for other users. @item nnimap-expunge-search-string @cindex expunging @vindex nnimap-expunge-search-string @cindex expiring @acronym{IMAP} mail This variable contain the @acronym{IMAP} search command sent to server when searching for articles eligible for expiring. The default is @code{"UID %s NOT SINCE %s"}, where the first @code{%s} is replaced by UID set and the second @code{%s} is replaced by a date. Probably the only useful value to change this to is @code{"UID %s NOT SENTSINCE %s"}, which makes nnimap use the Date: in messages instead of the internal article date. See section 6.4.4 of RFC 2060 for more information on valid strings. However, if @code{nnimap-search-uids-not-since-is-evil} is true, this variable has no effect since the search logic is reversed, as described below. @item nnimap-authinfo-file @vindex nnimap-authinfo-file A file containing credentials used to log in on servers. The format is (almost) the same as the @code{ftp} @file{~/.netrc} file. See the variable @code{nntp-authinfo-file} for exact syntax; also see @ref{NNTP}. An example of an .authinfo line for an IMAP server, is: @example machine students.uio.no login larsi password geheimnis port imap @end example Note that it should be @code{port imap}, or @code{port 143}, if you use a @code{nnimap-stream} of @code{tls} or @code{ssl}, even if the actual port number used is port 993 for secured IMAP. For convenience, Gnus will accept @code{port imaps} as a synonym of @code{port imap}. @item nnimap-need-unselect-to-notice-new-mail @vindex nnimap-need-unselect-to-notice-new-mail Unselect mailboxes before looking for new mail in them. Some servers seem to need this under some circumstances; it was reported that Courier 1.7.1 did. @item nnimap-nov-is-evil @vindex nnimap-nov-is-evil @cindex Courier @acronym{IMAP} server @cindex @acronym{NOV} Never generate or use a local @acronym{NOV} database. Defaults to the value of @code{gnus-agent}. Using a @acronym{NOV} database usually makes header fetching much faster, but it uses the @code{UID SEARCH UID} command, which is very slow on some servers (notably some versions of Courier). Since the Gnus Agent caches the information in the @acronym{NOV} database without using the slow command, this variable defaults to true if the Agent is in use, and false otherwise. @item nnimap-search-uids-not-since-is-evil @vindex nnimap-search-uids-not-since-is-evil @cindex Courier @acronym{IMAP} server @cindex expiring @acronym{IMAP} mail Avoid the @code{UID SEARCH UID @var{message numbers} NOT SINCE @var{date}} command, which is slow on some @acronym{IMAP} servers (notably, some versions of Courier). Instead, use @code{UID SEARCH SINCE @var{date}} and prune the list of expirable articles within Gnus. When Gnus expires your mail (@pxref{Expiring Mail}), it starts with a list of expirable articles and asks the IMAP server questions like Of these articles, which ones are older than a week?'' While this seems like a perfectly reasonable question, some IMAP servers take a long time to answer it, since they seemingly go looking into every old article to see if it is one of the expirable ones. Curiously, the question Of @emph{all} articles, which ones are newer than a week?'' seems to be much faster to answer, so setting this variable causes Gnus to ask this question and figure out the answer to the real question itself. This problem can really sneak up on you: when you first configure Gnus, everything works fine, but once you accumulate a couple thousand messages, you start cursing Gnus for being so slow. On the other hand, if you get a lot of email within a week, setting this variable will cause a lot of network traffic between Gnus and the IMAP server. @end table @menu * Splitting in IMAP:: Splitting mail with nnimap. * Expiring in IMAP:: Expiring mail with nnimap. * Editing IMAP ACLs:: Limiting/enabling other users access to a mailbox. * Expunging mailboxes:: Equivalent of a compress mailbox'' button. * A note on namespaces:: How to (not) use @acronym{IMAP} namespace in Gnus. * Debugging IMAP:: What to do when things don't work. @end menu @node Splitting in IMAP @subsection Splitting in IMAP @cindex splitting imap mail Splitting is something Gnus users have loved and used for years, and now the rest of the world is catching up. Yeah, dream on, not many @acronym{IMAP} servers have server side splitting and those that have splitting seem to use some non-standard protocol. This means that @acronym{IMAP} support for Gnus has to do its own splitting. And it does. (Incidentally, people seem to have been dreaming on, and Sieve has gaining a market share and is supported by several IMAP servers. Fortunately, Gnus support it too, @xref{Sieve Commands}.) Here are the variables of interest: @table @code @item nnimap-split-crosspost @cindex splitting, crosspost @cindex crosspost @vindex nnimap-split-crosspost If non-@code{nil}, do crossposting if several split methods match the mail. If @code{nil}, the first match in @code{nnimap-split-rule} found will be used. Nnmail equivalent: @code{nnmail-crosspost}. @item nnimap-split-inbox @cindex splitting, inbox @cindex inbox @vindex nnimap-split-inbox A string or a list of strings that gives the name(s) of @acronym{IMAP} mailboxes to split from. Defaults to @code{nil}, which means that splitting is disabled! @lisp (setq nnimap-split-inbox '("INBOX" ("~/friend/Mail" . "lists/*") "lists.imap")) @end lisp No nnmail equivalent. @item nnimap-split-rule @cindex splitting, rules @vindex nnimap-split-rule New mail found in @code{nnimap-split-inbox} will be split according to this variable. This variable contains a list of lists, where the first element in the sublist gives the name of the @acronym{IMAP} mailbox to move articles matching the regexp in the second element in the sublist. Got that? Neither did I, we need examples. @lisp (setq nnimap-split-rule '(("INBOX.nnimap" "^Sender: owner-nnimap@@vic20.globalcom.se") ("INBOX.junk" "^Subject:.*MAKE MONEY") ("INBOX.private" ""))) @end lisp This will put all articles from the nnimap mailing list into mailbox INBOX.nnimap, all articles containing MAKE MONEY in the Subject: line into INBOX.junk and everything else in INBOX.private. The first string may contain @samp{\\1} forms, like the ones used by replace-match to insert sub-expressions from the matched text. For instance: @lisp ("INBOX.lists.\\1" "^Sender: owner-\$$[a-z-]+\$$@@") @end lisp The first element can also be the symbol @code{junk} to indicate that matching messages should simply be deleted. Use with care. The second element can also be a function. In that case, it will be called with the first element of the rule as the argument, in a buffer containing the headers of the article. It should return a non-@code{nil} value if it thinks that the mail belongs in that group. Nnmail users might recollect that the last regexp had to be empty to match all articles (like in the example above). This is not required in nnimap. Articles not matching any of the regexps will not be moved out of your inbox. (This might affect performance if you keep lots of unread articles in your inbox, since the splitting code would go over them every time you fetch new mail.) These rules are processed from the beginning of the alist toward the end. The first rule to make a match will win'', unless you have crossposting enabled. In that case, all matching rules will win''. This variable can also have a function as its value, the function will be called with the headers narrowed and should return a group where it thinks the article should be split to. See @code{nnimap-split-fancy}. The splitting code tries to create mailboxes if it needs to. To allow for different split rules on different virtual servers, and even different split rules in different inboxes on the same server, the syntax of this variable have been extended along the lines of: @lisp (setq nnimap-split-rule '(("my1server" (".*" (("ding" "ding@@gnus.org") ("junk" "From:.*Simon")))) ("my2server" ("INBOX" nnimap-split-fancy)) ("my[34]server" (".*" (("private" "To:.*Simon") ("junk" my-junk-func)))))) @end lisp The virtual server name is in fact a regexp, so that the same rules may apply to several servers. In the example, the servers @code{my3server} and @code{my4server} both use the same rules. Similarly, the inbox string is also a regexp. The actual splitting rules are as before, either a function, or a list with group/regexp or group/function elements. Nnmail equivalent: @code{nnmail-split-methods}. @item nnimap-split-predicate @cindex splitting @vindex nnimap-split-predicate Mail matching this predicate in @code{nnimap-split-inbox} will be split, it is a string and the default is @samp{UNSEEN UNDELETED}. This might be useful if you use another @acronym{IMAP} client to read mail in your inbox but would like Gnus to split all articles in the inbox regardless of readedness. Then you might change this to @samp{UNDELETED}. @item nnimap-split-fancy @cindex splitting, fancy @findex nnimap-split-fancy @vindex nnimap-split-fancy It's possible to set @code{nnimap-split-rule} to @code{nnmail-split-fancy} if you want to use fancy splitting. @xref{Fancy Mail Splitting}. However, to be able to have different fancy split rules for nnmail and nnimap back ends you can set @code{nnimap-split-rule} to @code{nnimap-split-fancy} and define the nnimap specific fancy split rule in @code{nnimap-split-fancy}. Example: @lisp (setq nnimap-split-rule 'nnimap-split-fancy nnimap-split-fancy ...) @end lisp Nnmail equivalent: @code{nnmail-split-fancy}. @item nnimap-split-download-body @findex nnimap-split-download-body @vindex nnimap-split-download-body Set to non-@code{nil} to download entire articles during splitting. This is generally not required, and will slow things down considerably. You may need it if you want to use an advanced splitting function that analyzes the body to split the article. @end table @node Expiring in IMAP @subsection Expiring in IMAP @cindex expiring @acronym{IMAP} mail Even though @code{nnimap} is not a proper @code{nnmail} derived back end, it supports most features in regular expiring (@pxref{Expiring Mail}). Unlike splitting in @acronym{IMAP} (@pxref{Splitting in IMAP}) it does not clone the @code{nnmail} variables (i.e., creating @var{nnimap-expiry-wait}) but reuse the @code{nnmail} variables. What follows below are the variables used by the @code{nnimap} expiry process. A note on how the expire mark is stored on the @acronym{IMAP} server is appropriate here as well. The expire mark is translated into a @code{imap} client specific mark, @code{gnus-expire}, and stored on the message. This means that likely only Gnus will understand and treat the @code{gnus-expire} mark properly, although other clients may allow you to view client specific flags on the message. It also means that your server must support permanent storage of client specific flags on messages. Most do, fortunately. If expiring @acronym{IMAP} mail seems very slow, try setting the server variable @code{nnimap-search-uids-not-since-is-evil}. @table @code @item nnmail-expiry-wait @item nnmail-expiry-wait-function These variables are fully supported. The expire value can be a number, the symbol @code{immediate} or @code{never}. @item nnmail-expiry-target This variable is supported, and internally implemented by calling the @code{nnmail} functions that handle this. It contains an optimization that if the destination is a @acronym{IMAP} group on the same server, the article is copied instead of appended (that is, uploaded again). @end table @node Editing IMAP ACLs @subsection Editing IMAP ACLs @cindex editing imap acls @cindex Access Control Lists @cindex Editing @acronym{IMAP} ACLs @kindex G l (Group) @findex gnus-group-nnimap-edit-acl ACL stands for Access Control List. ACLs are used in @acronym{IMAP} for limiting (or enabling) other users access to your mail boxes. Not all @acronym{IMAP} servers support this, this function will give an error if it doesn't. To edit an ACL for a mailbox, type @kbd{G l} (@code{gnus-group-edit-nnimap-acl}) and you'll be presented with an ACL editing window with detailed instructions. Some possible uses: @itemize @bullet @item Giving anyone'' the lrs'' rights (lookup, read, keep seen/unseen flags) on your mailing list mailboxes enables other users on the same server to follow the list without subscribing to it. @item At least with the Cyrus server, you are required to give the user anyone'' posting ("p") capabilities to have plussing'' work (that is, mail sent to user+mailbox@@domain ending up in the @acronym{IMAP} mailbox INBOX.mailbox). @end itemize @node Expunging mailboxes @subsection Expunging mailboxes @cindex expunging @cindex expunge @cindex manual expunging @kindex G x (Group) @findex gnus-group-nnimap-expunge If you're using the @code{never} setting of @code{nnimap-expunge-on-close}, you may want the option of expunging all deleted articles in a mailbox manually. This is exactly what @kbd{G x} does. Currently there is no way of showing deleted articles, you can just delete them. @node A note on namespaces @subsection A note on namespaces @cindex IMAP namespace @cindex namespaces The @acronym{IMAP} protocol has a concept called namespaces, described by the following text in the RFC2060: @display 5.1.2. Mailbox Namespace Naming Convention By convention, the first hierarchical element of any mailbox name which begins with "#" identifies the "namespace" of the remainder of the name. This makes it possible to disambiguate between different types of mailbox stores, each of which have their own namespaces. For example, implementations which offer access to USENET newsgroups MAY use the "#news" namespace to partition the USENET newsgroup namespace from that of other mailboxes. Thus, the comp.mail.misc newsgroup would have an mailbox name of "#news.comp.mail.misc", and the name "comp.mail.misc" could refer to a different object (e.g. a user's private mailbox). @end display While there is nothing in this text that warrants concern for the @acronym{IMAP} implementation in Gnus, some servers use namespace prefixes in a way that does not work with how Gnus uses mailbox names. Specifically, University of Washington's @acronym{IMAP} server uses mailbox names like @code{#driver.mbx/read-mail} which are valid only in the @sc{create} and @sc{append} commands. After the mailbox is created (or a messages is appended to a mailbox), it must be accessed without the namespace prefix, i.e. @code{read-mail}. Since Gnus do not make it possible for the user to guarantee that user entered mailbox names will only be used with the CREATE and APPEND commands, you should simply not use the namespace prefixed mailbox names in Gnus. See the UoW IMAPD documentation for the @code{#driver.*/} prefix for more information on how to use the prefixes. They are a power tool and should be used only if you are sure what the effects are. @node Debugging IMAP @subsection Debugging IMAP @cindex IMAP debugging @cindex protocol dump (IMAP) @acronym{IMAP} is a complex protocol, more so than @acronym{NNTP} or @acronym{POP3}. Implementation bugs are not unlikely, and we do our best to fix them right away. If you encounter odd behavior, chances are that either the server or Gnus is buggy. If you are familiar with network protocols in general, you will probably be able to extract some clues from the protocol dump of the exchanges between Gnus and the server. Even if you are not familiar with network protocols, when you include the protocol dump in @acronym{IMAP}-related bug reports you are helping us with data critical to solving the problem. Therefore, we strongly encourage you to include the protocol dump when reporting IMAP bugs in Gnus. @vindex imap-log Because the protocol dump, when enabled, generates lots of data, it is disabled by default. You can enable it by setting @code{imap-log} as follows: @lisp (setq imap-log t) @end lisp This instructs the @code{imap.el} package to log any exchanges with the server. The log is stored in the buffer @samp{*imap-log*}. Look for error messages, which sometimes are tagged with the keyword @code{BAD}---but when submitting a bug, make sure to include all the data. @node Other Sources @section Other Sources Gnus can do more than just read news or mail. The methods described below allow Gnus to view directories and files as if they were newsgroups. @menu * Directory Groups:: You can read a directory as if it was a newsgroup. * Anything Groups:: Dired? Who needs dired? * Document Groups:: Single files can be the basis of a group. * SOUP:: Reading @sc{soup} packets offline''. * Mail-To-News Gateways:: Posting articles via mail-to-news gateways. @end menu @node Directory Groups @subsection Directory Groups @cindex nndir @cindex directory groups If you have a directory that has lots of articles in separate files in it, you might treat it as a newsgroup. The files have to have numerical names, of course. This might be an opportune moment to mention @code{ange-ftp} (and its successor @code{efs}), that most wonderful of all wonderful Emacs packages. When I wrote @code{nndir}, I didn't think much about it---a back end to read directories. Big deal. @code{ange-ftp} changes that picture dramatically. For instance, if you enter the @code{ange-ftp} file name @file{/ftp.hpc.uh.edu:/pub/emacs/ding-list/} as the directory name, @code{ange-ftp} or @code{efs} will actually allow you to read this directory over at @samp{sina} as a newsgroup. Distributed news ahoy! @code{nndir} will use @acronym{NOV} files if they are present. @code{nndir} is a read-only'' back end---you can't delete or expire articles with this method. You can use @code{nnmh} or @code{nnml} for whatever you use @code{nndir} for, so you could switch to any of those methods if you feel the need to have a non-read-only @code{nndir}. @node Anything Groups @subsection Anything Groups @cindex nneething From the @code{nndir} back end (which reads a single spool-like directory), it's just a hop and a skip to @code{nneething}, which pretends that any arbitrary directory is a newsgroup. Strange, but true. When @code{nneething} is presented with a directory, it will scan this directory and assign article numbers to each file. When you enter such a group, @code{nneething} must create headers'' that Gnus can use. After all, Gnus is a newsreader, in case you're forgetting. @code{nneething} does this in a two-step process. First, it snoops each file in question. If the file looks like an article (i.e., the first few lines look like headers), it will use this as the head. If this is just some arbitrary file without a head (e.g. a C source file), @code{nneething} will cobble up a header out of thin air. It will use file ownership, name and date and do whatever it can with these elements. All this should happen automatically for you, and you will be presented with something that looks very much like a newsgroup. Totally like a newsgroup, to be precise. If you select an article, it will be displayed in the article buffer, just as usual. If you select a line that represents a directory, Gnus will pop you into a new summary buffer for this @code{nneething} group. And so on. You can traverse the entire disk this way, if you feel like, but remember that Gnus is not dired, really, and does not intend to be, either. There are two overall modes to this action---ephemeral or solid. When doing the ephemeral thing (i.e., @kbd{G D} from the group buffer), Gnus will not store information on what files you have read, and what files are new, and so on. If you create a solid @code{nneething} group the normal way with @kbd{G m}, Gnus will store a mapping table between article numbers and file names, and you can treat this group like any other groups. When you activate a solid @code{nneething} group, you will be told how many unread articles it contains, etc., etc. Some variables: @table @code @item nneething-map-file-directory @vindex nneething-map-file-directory All the mapping files for solid @code{nneething} groups will be stored in this directory, which defaults to @file{~/.nneething/}. @item nneething-exclude-files @vindex nneething-exclude-files All files that match this regexp will be ignored. Nice to use to exclude auto-save files and the like, which is what it does by default. @item nneething-include-files @vindex nneething-include-files Regexp saying what files to include in the group. If this variable is non-@code{nil}, only files matching this regexp will be included. @item nneething-map-file @vindex nneething-map-file Name of the map files. @end table @node Document Groups @subsection Document Groups @cindex nndoc @cindex documentation group @cindex help group @code{nndoc} is a cute little thing that will let you read a single file as a newsgroup. Several files types are supported: @table @code @cindex Babyl @cindex Rmail mbox @item babyl The Babyl (Rmail) mail box. @cindex mbox @cindex Unix mbox @item mbox The standard Unix mbox file. @cindex MMDF mail box @item mmdf The MMDF mail box format. @item news Several news articles appended into a file. @cindex rnews batch files @item rnews The rnews batch transport format. @item nsmail Netscape mail boxes. @item mime-parts @acronym{MIME} multipart messages. @item standard-digest The standard (RFC 1153) digest format. @item mime-digest A @acronym{MIME} digest of messages. @item lanl-gov-announce Announcement messages from LANL Gov Announce. @cindex forwarded messages @item rfc822-forward A message forwarded according to RFC822. @item outlook The Outlook mail box. @item oe-dbx The Outlook Express dbx mail box. @item exim-bounce A bounce message from the Exim MTA. @item forward A message forwarded according to informal rules. @item rfc934 An RFC934-forwarded message. @item mailman A mailman digest. @item clari-briefs A digest of Clarinet brief news items. @item slack-digest Non-standard digest format---matches most things, but does it badly. @item mail-in-mail The last resort. @end table You can also use the special file type'' @code{guess}, which means that @code{nndoc} will try to guess what file type it is looking at. @code{digest} means that @code{nndoc} should guess what digest type the file is. @code{nndoc} will not try to change the file or insert any extra headers into it---it will simply, like, let you use the file as the basis for a group. And that's it. If you have some old archived articles that you want to insert into your new & spiffy Gnus mail back end, @code{nndoc} can probably help you with that. Say you have an old @file{RMAIL} file with mail that you now want to split into your new @code{nnml} groups. You look at that file using @code{nndoc} (using the @kbd{G f} command in the group buffer (@pxref{Foreign Groups})), set the process mark on all the articles in the buffer (@kbd{M P b}, for instance), and then re-spool (@kbd{B r}) using @code{nnml}. If all goes well, all the mail in the @file{RMAIL} file is now also stored in lots of @code{nnml} directories, and you can delete that pesky @file{RMAIL} file. If you have the guts! Virtual server variables: @table @code @item nndoc-article-type @vindex nndoc-article-type This should be one of @code{mbox}, @code{babyl}, @code{digest}, @code{news}, @code{rnews}, @code{mmdf}, @code{forward}, @code{rfc934}, @code{rfc822-forward}, @code{mime-parts}, @code{standard-digest}, @code{slack-digest}, @code{clari-briefs}, @code{nsmail}, @code{outlook}, @code{oe-dbx}, @code{mailman}, and @code{mail-in-mail} or @code{guess}. @item nndoc-post-type @vindex nndoc-post-type This variable says whether Gnus is to consider the group a news group or a mail group. There are two valid values: @code{mail} (the default) and @code{news}. @end table @menu * Document Server Internals:: How to add your own document types. @end menu @node Document Server Internals @subsubsection Document Server Internals Adding new document types to be recognized by @code{nndoc} isn't difficult. You just have to whip up a definition of what the document looks like, write a predicate function to recognize that document type, and then hook into @code{nndoc}. First, here's an example document type definition: @example (mmdf (article-begin . "^\^A\^A\^A\^A\n") (body-end . "^\^A\^A\^A\^A\n")) @end example The definition is simply a unique @dfn{name} followed by a series of regexp pseudo-variable settings. Below are the possible variables---don't be daunted by the number of variables; most document types can be defined with very few settings: @table @code @item first-article If present, @code{nndoc} will skip past all text until it finds something that match this regexp. All text before this will be totally ignored. @item article-begin This setting has to be present in all document type definitions. It says what the beginning of each article looks like. To do more complicated things that cannot be dealt with a simple regexp, you can use @code{article-begin-function} instead of this. @item article-begin-function If present, this should be a function that moves point to the beginning of each article. This setting overrides @code{article-begin}. @item head-begin If present, this should be a regexp that matches the head of the article. To do more complicated things that cannot be dealt with a simple regexp, you can use @code{head-begin-function} instead of this. @item head-begin-function If present, this should be a function that moves point to the head of the article. This setting overrides @code{head-begin}. @item head-end This should match the end of the head of the article. It defaults to @samp{^$}---the empty line.

@item body-begin
This should match the beginning of the body of the article.  It defaults
to @samp{^\n}.  To do more complicated things that cannot be dealt with
a simple regexp, you can use @code{body-begin-function} instead of this.

@item body-begin-function
If present, this function should move point to the beginning of the body
of the article.  This setting overrides @code{body-begin}.

@item body-end
If present, this should match the end of the body of the article.  To do
more complicated things that cannot be dealt with a simple regexp, you
can use @code{body-end-function} instead of this.

@item body-end-function
If present, this function should move point to the end of the body of
the article.  This setting overrides @code{body-end}.

@item file-begin
If present, this should match the beginning of the file.  All text
before this regexp will be totally ignored.

@item file-end
If present, this should match the end of the file.  All text after this
regexp will be totally ignored.

@end table

So, using these variables @code{nndoc} is able to dissect a document
file into a series of articles, each with a head and a body.  However, a
few more variables are needed since not all document types are all that
news-like---variables needed to transform the head or the body into
something that's palatable for Gnus:

@table @code
@item prepare-body-function
If present, this function will be called when requesting an article.  It
will be called with point at the start of the body, and is useful if the
document has encoded some parts of its contents.

@item article-transform-function
If present, this function is called when requesting an article.  It's
meant to be used for more wide-ranging transformation of both head and
body of the article.

If present, this function is called to generate a head that Gnus can
understand.  It is called with the article number as a parameter, and is
expected to generate a nice head for the article in question.  It is
called when requesting the headers of all articles.

@item generate-article-function
If present, this function is called to generate an entire article that
Gnus can understand.  It is called with the article number as a
parameter when requesting all articles.

@item dissection-function
If present, this function is called to dissect a document by itself,
overriding @code{first-article}, @code{article-begin},
@code{body-begin-function}, @code{body-end}, @code{body-end-function},
@code{file-begin}, and @code{file-end}.

@end table

Let's look at the most complicated example I can come up with---standard
digests:

@example
(standard-digest
(first-article . ,(concat "^" (make-string 70 ?-) "\n\n+"))
(article-begin . ,(concat "\n\n" (make-string 30 ?-) "\n\n+"))
(prepare-body-function . nndoc-unquote-dashes)
(body-end-function . nndoc-digest-body-end)
(head-end . "^ ?$") (body-begin . "^ ?\n") (file-end . "^End of .*digest.*[0-9].*\n\\*\\*\\|^End of.*Digest *$")
(subtype digest guess))
@end example

We see that all text before a 70-width line of dashes is ignored; all
text after a line that starts with that @samp{^End of} is also ignored;
each article begins with a 30-width line of dashes; the line separating
the head from the body may contain a single space; and that the body is
run through @code{nndoc-unquote-dashes} before being delivered.

To hook your own document definition into @code{nndoc}, use the
@code{nndoc-add-type} function.  It takes two parameters---the first
is the definition itself and the second (optional) parameter says
where in the document type definition alist to put this definition.
The alist is traversed sequentially, and
@code{nndoc-@var{type}-type-p} is called for a given type @var{type}.
So @code{nndoc-mmdf-type-p} is called to see whether a document is of
@code{mmdf} type, and so on.  These type predicates should return
@code{nil} if the document is not of the correct type; @code{t} if it
is of the correct type; and a number if the document might be of the
correct type.  A high number means high probability; a low number
means low probability with @samp{0} being the lowest valid number.

@node SOUP
@subsection SOUP
@cindex SOUP
@cindex offline

In the PC world people often talk about offline'' newsreaders.  These
are thingies that are combined reader/news transport monstrosities.
With built-in modem programs.  Yecchh!

Of course, us Unix Weenie types of human beans use things like
@code{uucp} and, like, @code{nntpd} and set up proper news and mail
transport things like Ghod intended.  And then we just use normal

However, it can sometimes be convenient to do something that's a bit
easier on the brain if you have a very slow modem, and you're not really
that interested in doing things properly.

A file format called @sc{soup} has been developed for transporting news
and mail from servers to home machines and back again.  It can be a bit
fiddly.

First some terminology:

@table @dfn

@item server
This is the machine that is connected to the outside world and where you
get news and/or mail from.

@item home machine
This is the machine that you want to do the actual reading and responding
on.  It is typically not connected to the rest of the world in any way.

@item packet
Something that contains messages and/or commands.  There are two kinds
of packets:

@table @dfn
@item message packets
These are packets made at the server, and typically contain lots of
messages for you to read.  These are called @file{SoupoutX.tgz} by
default, where @var{x} is a number.

@item response packets
These are packets made at the home machine, and typically contains
replies that you've written.  These are called @file{SoupinX.tgz} by
default, where @var{x} is a number.

@end table

@end table

@enumerate

@item
You log in on the server and create a @sc{soup} packet.  You can either
use a dedicated @sc{soup} thingie (like the @code{awk} program), or you
can use Gnus to create the packet with its @sc{soup} commands (@kbd{O
s} and/or @kbd{G s b}; and then @kbd{G s p}) (@pxref{SOUP Commands}).

@item
You transfer the packet home.  Rail, boat, car or modem will do fine.

@item
You put the packet in your home directory.

@item
You fire up Gnus on your home machine using the @code{nnsoup} back end as
the native or secondary server.

@item
You read articles and mail and answer and followup to the things you
want (@pxref{SOUP Replies}).

@item
You do the @kbd{G s r} command to pack these replies into a @sc{soup}
packet.

@item
You transfer this packet to the server.

@item
You use Gnus to mail this packet out with the @kbd{G s s} command.

@item
You then repeat until you die.

@end enumerate

So you basically have a bipartite system---you use @code{nnsoup} for
reading and Gnus for packing/sending these @sc{soup} packets.

* SOUP Commands::               Commands for creating and sending @sc{soup} packets
* SOUP Groups::                 A back end for reading @sc{soup} packets.
* SOUP Replies::                How to enable @code{nnsoup} to take over mail and news.

@node SOUP Commands
@subsubsection SOUP Commands

These are commands for creating and manipulating @sc{soup} packets.

@table @kbd
@item G s b
@kindex G s b (Group)
@findex gnus-group-brew-soup
Pack all unread articles in the current group
(@code{gnus-group-brew-soup}).  This command understands the
process/prefix convention.

@item G s w
@kindex G s w (Group)
@findex gnus-soup-save-areas
Save all @sc{soup} data files (@code{gnus-soup-save-areas}).

@item G s s
@kindex G s s (Group)
@findex gnus-soup-send-replies
Send all replies from the replies packet
(@code{gnus-soup-send-replies}).

@item G s p
@kindex G s p (Group)
@findex gnus-soup-pack-packet
Pack all files into a @sc{soup} packet (@code{gnus-soup-pack-packet}).

@item G s r
@kindex G s r (Group)
@findex nnsoup-pack-replies
Pack all replies into a replies packet (@code{nnsoup-pack-replies}).

@item O s
@kindex O s (Summary)
This summary-mode command adds the current article to a @sc{soup} packet
convention (@pxref{Process/Prefix}).

@end table

There are a few variables to customize where Gnus will put all these
thingies:

@table @code

@item gnus-soup-directory
@vindex gnus-soup-directory
Directory where Gnus will save intermediate files while composing
@sc{soup} packets.  The default is @file{~/SoupBrew/}.

@item gnus-soup-replies-directory
@vindex gnus-soup-replies-directory
This is what Gnus will use as a temporary directory while sending our
reply packets.  @file{~/SoupBrew/SoupReplies/} is the default.

@item gnus-soup-prefix-file
@vindex gnus-soup-prefix-file
Name of the file where Gnus stores the last used prefix.  The default is
@samp{gnus-prefix}.

@item gnus-soup-packer
@vindex gnus-soup-packer
A format string command for packing a @sc{soup} packet.  The default is
@samp{tar cf - %s | gzip > $HOME/Soupout%d.tgz}. @item gnus-soup-unpacker @vindex gnus-soup-unpacker Format string command for unpacking a @sc{soup} packet. The default is @samp{gunzip -c %s | tar xvf -}. @item gnus-soup-packet-directory @vindex gnus-soup-packet-directory Where Gnus will look for reply packets. The default is @file{~/}. @item gnus-soup-packet-regexp @vindex gnus-soup-packet-regexp Regular expression matching @sc{soup} reply packets in @code{gnus-soup-packet-directory}. @end table @node SOUP Groups @subsubsection SOUP Groups @cindex nnsoup @code{nnsoup} is the back end for reading @sc{soup} packets. It will read incoming packets, unpack them, and put them in a directory where you can read them at leisure. These are the variables you can use to customize its behavior: @table @code @item nnsoup-tmp-directory @vindex nnsoup-tmp-directory When @code{nnsoup} unpacks a @sc{soup} packet, it does it in this directory. (@file{/tmp/} by default.) @item nnsoup-directory @vindex nnsoup-directory @code{nnsoup} then moves each message and index file to this directory. The default is @file{~/SOUP/}. @item nnsoup-replies-directory @vindex nnsoup-replies-directory All replies will be stored in this directory before being packed into a reply packet. The default is @file{~/SOUP/replies/}. @item nnsoup-replies-format-type @vindex nnsoup-replies-format-type The @sc{soup} format of the replies packets. The default is @samp{?n} (rnews), and I don't think you should touch that variable. I probably shouldn't even have documented it. Drats! Too late! @item nnsoup-replies-index-type @vindex nnsoup-replies-index-type The index type of the replies packet. The default is @samp{?n}, which means none''. Don't fiddle with this one either! @item nnsoup-active-file @vindex nnsoup-active-file Where @code{nnsoup} stores lots of information. This is not an active file'' in the @code{nntp} sense; it's an Emacs Lisp file. If you lose this file or mess it up in any way, you're dead. The default is @file{~/SOUP/active}. @item nnsoup-packer @vindex nnsoup-packer Format string command for packing a reply @sc{soup} packet. The default is @samp{tar cf - %s | gzip >$HOME/Soupin%d.tgz}.

@item nnsoup-unpacker
@vindex nnsoup-unpacker
Format string command for unpacking incoming @sc{soup} packets.  The
default is @samp{gunzip -c %s | tar xvf -}.

@item nnsoup-packet-directory
@vindex nnsoup-packet-directory
Where @code{nnsoup} will look for incoming packets.  The default is
@file{~/}.

@item nnsoup-packet-regexp
@vindex nnsoup-packet-regexp
Regular expression matching incoming @sc{soup} packets.  The default is
@samp{Soupout}.

@item nnsoup-always-save
@vindex nnsoup-always-save
If non-@code{nil}, save the replies buffer after each posted message.

@end table

@node SOUP Replies
@subsubsection SOUP Replies

Just using @code{nnsoup} won't mean that your postings and mailings end
up in @sc{soup} reply packets automagically.  You have to work a bit
more for that to happen.

@findex nnsoup-set-variables
The @code{nnsoup-set-variables} command will set the appropriate
variables to ensure that all your followups and replies end up in the
@sc{soup} system.

In specific, this is what it does:

@lisp
(setq message-send-news-function 'nnsoup-request-post)
(setq message-send-mail-function 'nnsoup-request-mail)
@end lisp

And that's it, really.  If you only want news to go into the @sc{soup}
system you just use the first line.  If you only want mail to be
@sc{soup}ed you use the second.

@node Mail-To-News Gateways
@subsection Mail-To-News Gateways
@cindex mail-to-news gateways
@cindex gateways

If your local @code{nntp} server doesn't allow posting, for some reason
or other, you can post using one of the numerous mail-to-news gateways.
The @code{nngateway} back end provides the interface.

Note that you can't read anything from this back end---it can only be
used to post with.

Server variables:

@table @code
This is the address of the mail-to-news gateway.

News headers often have to be transformed in some odd way or other
for the mail-to-news gateway to accept it.  This variable says what
transformation should be called, and defaults to
narrowed to the headers to be transformed and with one parameter---the

This default function just inserts a new @code{To} header based on the
For instance, an article with this @code{Newsgroups} header:

@example
Newsgroups: alt.religion.emacs
@end example

will get this @code{To} header inserted:

@example
To: alt-religion-emacs@@GATEWAY
@end example

The following pre-defined functions exist:

@table @code

Creates a @code{To} header that looks like

Creates a @code{To} header that looks like
@end table

@end table

Here's an example:

@lisp
(setq gnus-post-method
'(nngateway
"mail2news@@replay.com"
@end lisp

So, to use this, simply say something like:

@lisp
@end lisp

@node Combined Groups
@section Combined Groups

Gnus allows combining a mixture of all the other group types into bigger
groups.

* Virtual Groups::              Combining articles from many groups.
* Kibozed Groups::              Looking through parts of the newsfeed for articles.

@node Virtual Groups
@subsection Virtual Groups
@cindex nnvirtual
@cindex virtual groups
@cindex merging groups

An @dfn{nnvirtual group} is really nothing more than a collection of
other groups.

For instance, if you are tired of reading many small groups, you can
put them all in one big group, and then grow tired of reading one
big, unwieldy group.  The joys of computing!

You specify @code{nnvirtual} as the method.  The address should be a
regexp to match component groups.

All marks in the virtual group will stick to the articles in the
component groups.  So if you tick an article in a virtual group, the
article will also be ticked in the component group from whence it
came.  (And vice versa---marks from the component groups will also be
shown in the virtual group.).  To create an empty virtual group, run
@kbd{G V} (@code{gnus-group-make-empty-virtual}) in the group buffer
and edit the method regexp with @kbd{M-e}
(@code{gnus-group-edit-group-method})

Here's an example @code{nnvirtual} method that collects all Andrea Dworkin
newsgroups into one, big, happy newsgroup:

@lisp
(nnvirtual "^alt\\.fan\\.andrea-dworkin$\\|^rec\\.dworkin.*") @end lisp The component groups can be native or foreign; everything should work smoothly, but if your computer explodes, it was probably my fault. Collecting the same group from several servers might actually be a good idea if users have set the Distribution header to limit distribution. If you would like to read @samp{soc.motss} both from a server in Japan and a server in Norway, you could use the following as the group regexp: @example "^nntp\\+server\\.jp:soc\\.motss$\\|^nntp\\+server\\.no:soc\\.motss$" @end example (Remember, though, that if you're creating the group with @kbd{G m}, you shouldn't double the backslashes, and you should leave off the quote characters at the beginning and the end of the string.) This should work kinda smoothly---all articles from both groups should end up in this one, and there should be no duplicates. Threading (and the rest) will still work as usual, but there might be problems with the sequence of articles. Sorting on date might be an option here (@pxref{Selecting a Group}). One limitation, however---all groups included in a virtual group have to be alive (i.e., subscribed or unsubscribed). Killed or zombie groups can't be component groups for @code{nnvirtual} groups. @vindex nnvirtual-always-rescan If the @code{nnvirtual-always-rescan} variable is non-@code{nil} (which is the default), @code{nnvirtual} will always scan groups for unread articles when entering a virtual group. If this variable is @code{nil} and you read articles in a component group after the virtual group has been activated, the read articles from the component group will show up when you enter the virtual group. You'll also see this effect if you have two virtual groups that have a component group in common. If that's the case, you should set this variable to @code{t}. Or you can just tap @code{M-g} on the virtual group every time before you enter it---it'll have much the same effect. @code{nnvirtual} can have both mail and news groups as component groups. When responding to articles in @code{nnvirtual} groups, @code{nnvirtual} has to ask the back end of the component group the article comes from whether it is a news or mail back end. However, when you do a @kbd{^}, there is typically no sure way for the component back end to know this, and in that case @code{nnvirtual} tells Gnus that the article came from a not-news back end. (Just to be on the safe side.) @kbd{C-c C-n} in the message buffer will insert the @code{Newsgroups} line from the article you respond to in these cases. @code{nnvirtual} groups do not inherit anything but articles and marks from component groups---group parameters, for instance, are not inherited. @node Kibozed Groups @subsection Kibozed Groups @cindex nnkiboze @cindex kibozing @dfn{Kibozing} is defined by the @acronym{OED} as grepping through (parts of) the news feed''. @code{nnkiboze} is a back end that will do this for you. Oh joy! Now you can grind any @acronym{NNTP} server down to a halt with useless requests! Oh happiness! @kindex G k (Group) To create a kibozed group, use the @kbd{G k} command in the group buffer. The address field of the @code{nnkiboze} method is, as with @code{nnvirtual}, a regexp to match groups to be included'' in the @code{nnkiboze} group. That's where most similarities between @code{nnkiboze} and @code{nnvirtual} end. In addition to this regexp detailing component groups, an @code{nnkiboze} group must have a score file to say what articles are to be included in the group (@pxref{Scoring}). @kindex M-x nnkiboze-generate-groups @findex nnkiboze-generate-groups You must run @kbd{M-x nnkiboze-generate-groups} after creating the @code{nnkiboze} groups you want to have. This command will take time. Lots of time. Oodles and oodles of time. Gnus has to fetch the headers from all the articles in all the component groups and run them through the scoring process to determine if there are any articles in the groups that are to be part of the @code{nnkiboze} groups. Please limit the number of component groups by using restrictive regexps. Otherwise your sysadmin may become annoyed with you, and the @acronym{NNTP} site may throw you off and never let you back in again. Stranger things have happened. @code{nnkiboze} component groups do not have to be alive---they can be dead, and they can be foreign. No restrictions. @vindex nnkiboze-directory The generation of an @code{nnkiboze} group means writing two files in @code{nnkiboze-directory}, which is @file{~/News/kiboze/} by default. One contains the @acronym{NOV} header lines for all the articles in the group, and the other is an additional @file{.newsrc} file to store information on what groups have been searched through to find component articles. Articles marked as read in the @code{nnkiboze} group will have their @acronym{NOV} lines removed from the @acronym{NOV} file. @node Email Based Diary @section Email Based Diary @cindex diary @cindex email based diary @cindex calendar This section describes a special mail back end called @code{nndiary}, and its companion library @code{gnus-diary}. It is special'' in the sense that it is not meant to be one of the standard alternatives for reading mail with Gnus. See @ref{Choosing a Mail Back End} for that. Instead, it is used to treat @emph{some} of your mails in a special way, namely, as event reminders. Here is a typical scenario: @itemize @bullet @item You've got a date with Andy Mc Dowell or Bruce Willis (select according to your sexual preference) in one month. You don't want to forget it. @item So you send a reminder'' message (actually, a diary one) to yourself. @item You forget all about it and keep on getting and reading new mail, as usual. @item From time to time, as you type g' in the group buffer and as the date is getting closer, the message will pop up again to remind you of your appointment, just as if it were new and unread. @item Read your new'' messages, this one included, and start dreaming again of the night you're gonna have. @item Once the date is over (you actually fell asleep just after dinner), the message will be automatically deleted if it is marked as expirable. @end itemize The Gnus Diary back end has the ability to handle regular appointments (that wouldn't ever be deleted) as well as punctual ones, operates as a real mail back end and is configurable in many ways. All of this is explained in the sections below. @menu * The NNDiary Back End:: Basic setup and usage. * The Gnus Diary Library:: Utility toolkit on top of nndiary. * Sending or Not Sending:: A final note on sending diary messages. @end menu @node The NNDiary Back End @subsection The NNDiary Back End @cindex nndiary @cindex the nndiary back end @code{nndiary} is a back end very similar to @code{nnml} (@pxref{Mail Spool}). Actually, it could appear as a mix of @code{nnml} and @code{nndraft}. If you know @code{nnml}, you're already familiar with the message storing scheme of @code{nndiary}: one file per message, one directory per group. Before anything, there is one requirement to be able to run @code{nndiary} properly: you @emph{must} use the group timestamp feature of Gnus. This adds a timestamp to each group's parameters. @ref{Group Timestamp} to see how it's done. @menu * Diary Messages:: What makes a message valid for nndiary. * Running NNDiary:: NNDiary has two modes of operation. * Customizing NNDiary:: Bells and whistles. @end menu @node Diary Messages @subsubsection Diary Messages @cindex nndiary messages @cindex nndiary mails @code{nndiary} messages are just normal ones, except for the mandatory presence of 7 special headers. These headers are of the form @code{X-Diary-<something>}, @code{<something>} being one of @code{Minute}, @code{Hour}, @code{Dom}, @code{Month}, @code{Year}, @code{Time-Zone} and @code{Dow}. @code{Dom} means Day of Month'', and @code{dow} means Day of Week''. These headers actually behave like crontab specifications and define the event date(s): @itemize @bullet @item For all headers except the @code{Time-Zone} one, a header value is either a star (meaning all possible values), or a list of fields (separated by a comma). @item A field is either an integer, or a range. @item A range is two integers separated by a dash. @item Possible integer values are 0--59 for @code{Minute}, 0--23 for @code{Hour}, 1--31 for @code{Dom}, 1--12 for @code{Month}, above 1971 for @code{Year} and 0--6 for @code{Dow} (0 meaning Sunday). @item As a special case, a star in either @code{Dom} or @code{Dow} doesn't mean all possible values'', but use only the other field''. Note that if both are star'ed, the use of either one gives the same result. @item The @code{Time-Zone} header is special in that it can only have one value (@code{GMT}, for instance). A star doesn't mean all possible values'' (because it makes no sense), but the current local time zone''. Most of the time, you'll be using a star here. However, for a list of available time zone values, see the variable @code{nndiary-headers}. @end itemize As a concrete example, here are the diary headers to add to your message for specifying Each Monday and each 1st of month, at 12:00, 20:00, 21:00, 22:00, 23:00 and 24:00, from 1999 to 2010'' (I'll let you find what to do then): @example X-Diary-Minute: 0 X-Diary-Hour: 12, 20-24 X-Diary-Dom: 1 X-Diary-Month: * X-Diary-Year: 1999-2010 X-Diary-Dow: 1 X-Diary-Time-Zone: * @end example @node Running NNDiary @subsubsection Running NNDiary @cindex running nndiary @cindex nndiary operation modes @code{nndiary} has two modes of operation: traditional'' (the default) and autonomous''. In traditional mode, @code{nndiary} does not get new mail by itself. You have to move (@kbd{B m}) or copy (@kbd{B c}) mails from your primary mail back end to nndiary groups in order to handle them as diary messages. In autonomous mode, @code{nndiary} retrieves its own mail and handles it independently from your primary mail back end. One should note that Gnus is not inherently designed to allow several master'' mail back ends at the same time. However, this does make sense with @code{nndiary}: you really want to send and receive diary messages to your diary groups directly. So, @code{nndiary} supports being sort of a second primary mail back end'' (to my knowledge, it is the only back end offering this feature). However, there is a limitation (which I hope to fix some day): respooling doesn't work in autonomous mode. In order to use @code{nndiary} in autonomous mode, you have several things to do: @itemize @bullet @item Allow @code{nndiary} to retrieve new mail by itself. Put the following line in your @file{~/.gnus.el} file: @lisp (setq nndiary-get-new-mail t) @end lisp @item You must arrange for diary messages (those containing @code{X-Diary-*} headers) to be split in a private folder @emph{before} Gnus treat them. Again, this is needed because Gnus cannot (yet ?) properly handle multiple primary mail back ends. Getting those messages from a separate source will compensate this misfeature to some extent. As an example, here's my procmailrc entry to store diary files in @file{~/.nndiary} (the default @code{nndiary} mail source file): @example :0 HD : * ^X-Diary .nndiary @end example @end itemize Once this is done, you might want to customize the following two options that affect the diary mail retrieval and splitting processes: @defvar nndiary-mail-sources This is the diary-specific replacement for the standard @code{mail-sources} variable. It obeys the same syntax, and defaults to @code{(file :path "~/.nndiary")}. @end defvar @defvar nndiary-split-methods This is the diary-specific replacement for the standard @code{nnmail-split-methods} variable. It obeys the same syntax. @end defvar Finally, you may add a permanent @code{nndiary} virtual server (something like @code{(nndiary "diary")} should do) to your @code{gnus-secondary-select-methods}. Hopefully, almost everything (see the TODO section in @file{nndiary.el}) will work as expected when you restart Gnus: in autonomous mode, typing @kbd{g} and @kbd{M-g} in the group buffer, will also get your new diary mails and split them according to your diary-specific rules, @kbd{F} will find your new diary groups etc. @node Customizing NNDiary @subsubsection Customizing NNDiary @cindex customizing nndiary @cindex nndiary customization Now that @code{nndiary} is up and running, it's time to customize it. The custom group is called @code{nndiary} (no, really ?!). You should browse it to figure out which options you'd like to tweak. The following two variables are probably the only ones you will want to change: @defvar nndiary-reminders This is the list of times when you want to be reminded of your appointements (e.g. 3 weeks before, then 2 days before, then 1 hour before and that's it). Remember that being reminded'' means that the diary message will pop up as brand new and unread again when you get new mail. @end defvar @defvar nndiary-week-starts-on-monday Rather self-explanatory. Otherwise, Sunday is assumed (this is the default). @end defvar @node The Gnus Diary Library @subsection The Gnus Diary Library @cindex gnus-diary @cindex the gnus diary library Using @code{nndiary} manually (I mean, writing the headers by hand and so on) would be rather boring. Fortunately, there is a library called @code{gnus-diary} written on top of @code{nndiary}, that does many useful things for you. In order to use it, add the following line to your @file{~/.gnus.el} file: @lisp (require 'gnus-diary) @end lisp Also, you shouldn't use any @code{gnus-user-format-function-[d|D]} (@pxref{Summary Buffer Lines}). @code{gnus-diary} provides both of these (sorry if you used them before). @menu * Diary Summary Line Format:: A nicer summary buffer line format. * Diary Articles Sorting:: A nicer way to sort messages. * Diary Headers Generation:: Not doing it manually. * Diary Group Parameters:: Not handling them manually. @end menu @node Diary Summary Line Format @subsubsection Diary Summary Line Format @cindex diary summary buffer line @cindex diary summary line format Displaying diary messages in standard summary line format (usually something like @samp{From Joe: Subject}) is pretty useless. Most of the time, you're the one who wrote the message, and you mostly want to see the event's date. @code{gnus-diary} provides two supplemental user formats to be used in summary line formats. @code{D} corresponds to a formatted time string for the next occurrence of the event (e.g. Sat, Sep 22 01, 12:00''), while @code{d} corresponds to an approximative remaining time until the next occurrence of the event (e.g. in 6 months, 1 week''). For example, here's how Joe's birthday is displayed in my @code{nndiary+diary:birthdays} summary buffer (note that the message is expirable, but will never be deleted, as it specifies a periodic event): @example E Sat, Sep 22 01, 12:00: Joe's birthday (in 6 months, 1 week) @end example In order to get something like the above, you would normally add the following line to your diary groups'parameters: @lisp (gnus-summary-line-format "%U%R%z %uD: %(%s%) (%ud)\n") @end lisp However, @code{gnus-diary} does it automatically (@pxref{Diary Group Parameters}). You can however customize the provided summary line format with the following user options: @defvar gnus-diary-summary-line-format Defines the summary line format used for diary groups (@pxref{Summary Buffer Lines}). @code{gnus-diary} uses it to automatically update the diary groups'parameters. @end defvar @defvar gnus-diary-time-format Defines the format to display dates in diary summary buffers. This is used by the @code{D} user format. See the docstring for details. @end defvar @defvar gnus-diary-delay-format-function Defines the format function to use for displaying delays (remaining times) in diary summary buffers. This is used by the @code{d} user format. There are currently built-in functions for English and French; you can also define your own. See the docstring for details. @end defvar @node Diary Articles Sorting @subsubsection Diary Articles Sorting @cindex diary articles sorting @cindex diary summary lines sorting @findex gnus-summary-sort-by-schedule @findex gnus-thread-sort-by-schedule @findex gnus-article-sort-by-schedule @code{gnus-diary} provides new sorting functions (@pxref{Sorting the Summary Buffer} ) called @code{gnus-summary-sort-by-schedule}, @code{gnus-thread-sort-by-schedule} and @code{gnus-article-sort-by-schedule}. These functions let you organize your diary summary buffers from the closest event to the farthest one. @code{gnus-diary} automatically installs @code{gnus-summary-sort-by-schedule} as a menu item in the summary buffer's sort'' menu, and the two others as the primary (hence default) sorting functions in the group parameters (@pxref{Diary Group Parameters}). @node Diary Headers Generation @subsubsection Diary Headers Generation @cindex diary headers generation @findex gnus-diary-check-message @code{gnus-diary} provides a function called @code{gnus-diary-check-message} to help you handle the @code{X-Diary-*} headers. This function ensures that the current message contains all the required diary headers, and prompts you for values or corrections if needed. This function is hooked into the @code{nndiary} back end, so that moving or copying an article to a diary group will trigger it automatically. It is also bound to @kbd{C-c D c} in @code{message-mode} and @code{article-edit-mode} in order to ease the process of converting a usual mail to a diary one. This function takes a prefix argument which will force prompting of all diary headers, regardless of their presence or validity. That way, you can very easily reschedule an already valid diary message, for instance. @node Diary Group Parameters @subsubsection Diary Group Parameters @cindex diary group parameters When you create a new diary group, or visit one, @code{gnus-diary} automatically checks your group parameters and if needed, sets the summary line format to the diary-specific value, installs the diary-specific sorting functions, and also adds the different @code{X-Diary-*} headers to the group's posting-style. It is then easier to send a diary message, because if you use @kbd{C-u a} or @kbd{C-u m} on a diary group to prepare a message, these headers will be inserted automatically (although not filled with proper values yet). @node Sending or Not Sending @subsection Sending or Not Sending Well, assuming you've read of of the above, here are two final notes on mail sending with @code{nndiary}: @itemize @bullet @item @code{nndiary} is a @emph{real} mail back end. You really send real diary messsages for real. This means for instance that you can give appointements to anybody (provided they use Gnus and @code{nndiary}) by sending the diary message to them as well. @item However, since @code{nndiary} also has a @code{request-post} method, you can also use @kbd{C-u a} instead of @kbd{C-u m} on a diary group and the message won't actually be sent; just stored locally in the group. This comes in very handy for private appointments. @end itemize @node Gnus Unplugged @section Gnus Unplugged @cindex offline @cindex unplugged @cindex agent @cindex Gnus agent @cindex Gnus unplugged In olden times (ca. February '88), people used to run their newsreaders on big machines with permanent connections to the net. News transport was dealt with by news servers, and all the newsreaders had to do was to read news. Believe it or not. Nowadays most people read news and mail at home, and use some sort of modem to connect to the net. To avoid running up huge phone bills, it would be nice to have a way to slurp down all the news and mail, hang up the phone, read for several hours, and then upload any responses you have to make. And then you repeat the procedure. Of course, you can use news servers for doing this as well. I've used @code{inn} together with @code{slurp}, @code{pop} and @code{sendmail} for some years, but doing that's a bore. Moving the news server functionality up to the newsreader makes sense if you're the only person reading news on a machine. Setting up Gnus as an offline'' newsreader is quite simple. In fact, you don't even have to configure anything. Of course, to use it as such, you have to learn a few new commands. @menu * Agent Basics:: How it all is supposed to work. * Agent Categories:: How to tell the Gnus Agent what to download. * Agent Commands:: New commands for all the buffers. * Agent Visuals:: Ways that the agent may effect your summary buffer. * Agent as Cache:: The Agent is a big cache too. * Agent Expiry:: How to make old articles go away. * Agent Regeneration:: How to recover from lost connections and other accidents. * Agent and IMAP:: How to use the Agent with @acronym{IMAP}. * Outgoing Messages:: What happens when you post/mail something? * Agent Variables:: Customizing is fun. * Example Setup:: An example @file{~/.gnus.el} file for offline people. * Batching Agents:: How to fetch news from a @code{cron} job. * Agent Caveats:: What you think it'll do and what it does. @end menu @node Agent Basics @subsection Agent Basics First, let's get some terminology out of the way. The Gnus Agent is said to be @dfn{unplugged} when you have severed the connection to the net (and notified the Agent that this is the case). When the connection to the net is up again (and Gnus knows this), the Agent is @dfn{plugged}. The @dfn{local} machine is the one you're running on, and which isn't connected to the net continuously. @dfn{Downloading} means fetching things from the net to your local machine. @dfn{Uploading} is doing the opposite. You know that Gnus gives you all the opportunity you'd ever want for shooting yourself in the foot. Some people call it flexibility. Gnus is also customizable to a great extent, which means that the user has a say on how Gnus behaves. Other newsreaders might unconditionally shoot you in your foot, but with Gnus, you have a choice! Gnus is never really in plugged or unplugged state. Rather, it applies that state to each server individually. This means that some servers can be plugged while others can be unplugged. Additionally, some servers can be ignored by the Agent altogether (which means that they're kinda like plugged always). So when you unplug the Agent and then wonder why is Gnus opening a connection to the Net, the next step to do is to look whether all servers are agentized. If there is an unagentized server, you found the culprit. Another thing is the @dfn{offline} state. Sometimes, servers aren't reachable. When Gnus notices this, it asks you whether you want the server to be switched to offline state. If you say yes, then the server will behave somewhat as if it was unplugged, except that Gnus will ask you whether you want to switch it back online again. Let's take a typical Gnus session using the Agent. @itemize @bullet @item @findex gnus-unplugged You start Gnus with @code{gnus-unplugged}. This brings up the Gnus Agent in a disconnected state. You can read all the news that you have already fetched while in this mode. @item You then decide to see whether any new news has arrived. You connect your machine to the net (using PPP or whatever), and then hit @kbd{J j} to make Gnus become @dfn{plugged} and use @kbd{g} to check for new mail as usual. To check for new mail in unplugged mode (@pxref{Mail Source Specifiers}). @item You can then read the new news immediately, or you can download the news onto your local machine. If you want to do the latter, you press @kbd{g} to check if there are any new news and then @kbd{J s} to fetch all the eligible articles in all the groups. (To let Gnus know which articles you want to download, @pxref{Agent Categories}). @item After fetching the articles, you press @kbd{J j} to make Gnus become unplugged again, and you shut down the PPP thing (or whatever). And then you read the news offline. @item And then you go to step 2. @end itemize Here are some things you should do the first time (or so) that you use the Agent. @itemize @bullet @item Decide which servers should be covered by the Agent. If you have a mail back end, it would probably be nonsensical to have it covered by the Agent. Go to the server buffer (@kbd{^} in the group buffer) and press @kbd{J a} on the server (or servers) that you wish to have covered by the Agent (@pxref{Server Agent Commands}), or @kbd{J r} on automatically added servers you do not wish to have covered by the Agent. By default, all @code{nntp} and @code{nnimap} servers in @code{gnus-select-method} and @code{gnus-secondary-select-methods} are agentized. @item Decide on download policy. It's fairly simple once you decide whether you are going to use agent categories, topic parameters, and/or group parameters to implement your policy. If you're new to gnus, it is probably best to start with a category, @xref{Agent Categories}. Both topic parameters (@pxref{Topic Parameters}) and agent categories (@pxref{Agent Categories}) provide for setting a policy that applies to multiple groups. Which you use is entirely up to you. Topic parameters do override categories so, if you mix the two, you'll have to take that into account. If you have a few groups that deviate from your policy, you can use group parameters (@pxref{Group Parameters}) to configure them. @item Uhm@dots{} that's it. @end itemize @node Agent Categories @subsection Agent Categories One of the main reasons to integrate the news transport layer into the newsreader is to allow greater control over what articles to download. There's not much point in downloading huge amounts of articles, just to find out that you're not interested in reading any of them. It's better to be somewhat more conservative in choosing what to download, and then mark the articles for downloading manually if it should turn out that you're interested in the articles anyway. One of the more effective methods for controlling what is to be downloaded is to create a @dfn{category} and then assign some (or all) groups to this category. Groups that do not belong in any other category belong to the @code{default} category. Gnus has its own buffer for creating and managing categories. If you prefer, you can also use group parameters (@pxref{Group Parameters}) and topic parameters (@pxref{Topic Parameters}) for an alternative approach to controlling the agent. The only real difference is that categories are specific to the agent (so there is less to learn) while group and topic parameters include the kitchen sink. Since you can set agent parameters in several different places we have a rule to decide which source to believe. This rule specifies that the parameter sources are checked in the following order: group parameters, topic parameters, agent category, and finally customizable variables. So you can mix all of these sources to produce a wide range of behavior, just don't blame me if you don't remember where you put your settings. @menu * Category Syntax:: What a category looks like. * Category Buffer:: A buffer for maintaining categories. * Category Variables:: Customize'r'Us. @end menu @node Category Syntax @subsubsection Category Syntax A category consists of a name, the list of groups belonging to the category, and a number of optional parameters that override the customizable variables. The complete list of agent parameters are listed below. @cindex Agent Parameters @table @code @item gnus-agent-cat-name The name of the category. @item gnus-agent-cat-groups The list of groups that are in this category. @item gnus-agent-cat-predicate A predicate which (generally) gives a rough outline of which articles are eligible for downloading; and @item gnus-agent-cat-score-file a score rule which (generally) gives you a finer granularity when deciding what articles to download. (Note that this @dfn{download score} is not necessarily related to normal scores.) @item gnus-agent-cat-enable-expiration a boolean indicating whether the agent should expire old articles in this group. Most groups should be expired to conserve disk space. In fact, its probably safe to say that the gnus.* hierarchy contains the only groups that should not be expired. @item gnus-agent-cat-days-until-old an integer indicating the number of days that the agent should wait before deciding that a read article is safe to expire. @item gnus-agent-cat-low-score an integer that overrides the value of @code{gnus-agent-low-score}. @item gnus-agent-cat-high-score an integer that overrides the value of @code{gnus-agent-high-score}. @item gnus-agent-cat-length-when-short an integer that overrides the value of @code{gnus-agent-short-article}. @item gnus-agent-cat-length-when-long an integer that overrides the value of @code{gnus-agent-long-article}. @c @item gnus-agent-cat-disable-undownloaded-faces @c a symbol indicating whether the summary buffer should @emph{not} display @c undownloaded articles using the gnus-summary-*-undownloaded-face @c faces. The symbol nil will enable the use of undownloaded faces while @c all other symbols disable them. @item gnus-agent-cat-enable-undownloaded-faces a symbol indicating whether the summary buffer should display undownloaded articles using the gnus-summary-*-undownloaded-face faces. The symbol nil will disable the use of undownloaded faces while all other symbols enable them. @end table The name of a category can not be changed once the category has been created. Each category maintains a list of groups that are exclusive members of that category. The exclusivity rule is automatically enforced, add a group to a new category and it is automatically removed from its old category. A predicate in its simplest form can be a single predicate such as @code{true} or @code{false}. These two will download every available article or nothing respectively. In the case of these two special predicates an additional score rule is superfluous. Predicates of @code{high} or @code{low} download articles in respect of their scores in relationship to @code{gnus-agent-high-score} and @code{gnus-agent-low-score} as described below. To gain even finer control of what is to be regarded eligible for download a predicate can consist of a number of predicates with logical operators sprinkled in between. Perhaps some examples are in order. Here's a simple predicate. (It's the default predicate, in fact, used for all groups that don't belong to any other category.) @lisp short @end lisp Quite simple, eh? This predicate is true if and only if the article is short (for some value of short''). Here's a more complex predicate: @lisp (or high (and (not low) (not long))) @end lisp This means that an article should be downloaded if it has a high score, or if the score is not low and the article is not long. You get the drift. The available logical operators are @code{or}, @code{and} and @code{not}. (If you prefer, you can use the more C''-ish operators @samp{|}, @code{&} and @code{!} instead.) The following predicates are pre-defined, but if none of these fit what you want to do, you can write your own. When evaluating each of these predicates, the named constant will be bound to the value determined by calling @code{gnus-agent-find-parameter} on the appropriate parameter. For example, gnus-agent-short-article will be bound to @code{(gnus-agent-find-parameter group 'agent-short-article)}. This means that you can specify a predicate in your category then tune that predicate to individual groups. @table @code @item short True iff the article is shorter than @code{gnus-agent-short-article} lines; default 100. @item long True iff the article is longer than @code{gnus-agent-long-article} lines; default 200. @item low True iff the article has a download score less than @code{gnus-agent-low-score}; default 0. @item high True iff the article has a download score greater than @code{gnus-agent-high-score}; default 0. @item spam True iff the Gnus Agent guesses that the article is spam. The heuristics may change over time, but at present it just computes a checksum and sees whether articles match. @item true Always true. @item false Always false. @end table If you want to create your own predicate function, here's what you have to know: The functions are called with no parameters, but the @code{gnus-headers} and @code{gnus-score} dynamic variables are bound to useful values. For example, you could decide that you don't want to download articles that were posted more than a certain number of days ago (e.g. posted more than @code{gnus-agent-expire-days} ago) you might write a function something along the lines of the following: @lisp (defun my-article-old-p () "Say whether an article is old." (< (time-to-days (date-to-time (mail-header-date gnus-headers))) (- (time-to-days (current-time)) gnus-agent-expire-days))) @end lisp with the predicate then defined as: @lisp (not my-article-old-p) @end lisp or you could append your predicate to the predefined @code{gnus-category-predicate-alist} in your @file{~/.gnus.el} or wherever. @lisp (require 'gnus-agent) (setq gnus-category-predicate-alist (append gnus-category-predicate-alist '((old . my-article-old-p)))) @end lisp and simply specify your predicate as: @lisp (not old) @end lisp If/when using something like the above, be aware that there are many misconfigured systems/mailers out there and so an article's date is not always a reliable indication of when it was posted. Hell, some people just don't give a damn. The above predicates apply to @emph{all} the groups which belong to the category. However, if you wish to have a specific predicate for an individual group within a category, or you're just too lazy to set up a new category, you can enter a group's individual predicate in its group parameters like so: @lisp (agent-predicate . short) @end lisp This is the group/topic parameter equivalent of the agent category default. Note that when specifying a single word predicate like this, the @code{agent-predicate} specification must be in dotted pair notation. The equivalent of the longer example from above would be: @lisp (agent-predicate or high (and (not low) (not long))) @end lisp The outer parenthesis required in the category specification are not entered here as, not being in dotted pair notation, the value of the predicate is assumed to be a list. Now, the syntax of the download score is the same as the syntax of normal score files, except that all elements that require actually seeing the article itself are verboten. This means that only the following headers can be scored on: @code{Subject}, @code{From}, @code{Date}, @code{Message-ID}, @code{References}, @code{Chars}, @code{Lines}, and @code{Xref}. As with predicates, the specification of the @code{download score rule} to use in respect of a group can be in either the category definition if it's to be applicable to all groups in therein, or a group's parameters if it's to be specific to that group. In both of these places the @code{download score rule} can take one of three forms: @enumerate @item Score rule This has the same syntax as a normal Gnus score file except only a subset of scoring keywords are available as mentioned above. example: @itemize @bullet @item Category specification @lisp (("from" ("Lars Ingebrigtsen" 1000000 nil s)) ("lines" (500 -100 nil <))) @end lisp @item Group/Topic Parameter specification @lisp (agent-score ("from" ("Lars Ingebrigtsen" 1000000 nil s)) ("lines" (500 -100 nil <))) @end lisp Again, note the omission of the outermost parenthesis here. @end itemize @item Agent score file These score files must @emph{only} contain the permitted scoring keywords stated above. example: @itemize @bullet @item Category specification @lisp ("~/News/agent.SCORE") @end lisp or perhaps @lisp ("~/News/agent.SCORE" "~/News/agent.group.SCORE") @end lisp @item Group Parameter specification @lisp (agent-score "~/News/agent.SCORE") @end lisp Additional score files can be specified as above. Need I say anything about parenthesis? @end itemize @item Use @code{normal} score files If you don't want to maintain two sets of scoring rules for a group, and your desired @code{downloading} criteria for a group are the same as your @code{reading} criteria then you can tell the agent to refer to your @code{normal} score files when deciding what to download. These directives in either the category definition or a group's parameters will cause the agent to read in all the applicable score files for a group, @emph{filtering out} those sections that do not relate to one of the permitted subset of scoring keywords. @itemize @bullet @item Category Specification @lisp file @end lisp @item Group Parameter specification @lisp (agent-score . file) @end lisp @end itemize @end enumerate @node Category Buffer @subsubsection Category Buffer You'd normally do all category maintenance from the category buffer. When you enter it for the first time (with the @kbd{J c} command from the group buffer), you'll only see the @code{default} category. The following commands are available in this buffer: @table @kbd @item q @kindex q (Category) @findex gnus-category-exit Return to the group buffer (@code{gnus-category-exit}). @item e @kindex e (Category) @findex gnus-category-customize-category Use a customization buffer to set all of the selected category's parameters at one time (@code{gnus-category-customize-category}). @item k @kindex k (Category) @findex gnus-category-kill Kill the current category (@code{gnus-category-kill}). @item c @kindex c (Category) @findex gnus-category-copy Copy the current category (@code{gnus-category-copy}). @item a @kindex a (Category) @findex gnus-category-add Add a new category (@code{gnus-category-add}). @item p @kindex p (Category) @findex gnus-category-edit-predicate Edit the predicate of the current category (@code{gnus-category-edit-predicate}). @item g @kindex g (Category) @findex gnus-category-edit-groups Edit the list of groups belonging to the current category (@code{gnus-category-edit-groups}). @item s @kindex s (Category) @findex gnus-category-edit-score Edit the download score rule of the current category (@code{gnus-category-edit-score}). @item l @kindex l (Category) @findex gnus-category-list List all the categories (@code{gnus-category-list}). @end table @node Category Variables @subsubsection Category Variables @table @code @item gnus-category-mode-hook @vindex gnus-category-mode-hook Hook run in category buffers. @item gnus-category-line-format @vindex gnus-category-line-format Format of the lines in the category buffer (@pxref{Formatting Variables}). Valid elements are: @table @samp @item c The name of the category. @item g The number of groups in the category. @end table @item gnus-category-mode-line-format @vindex gnus-category-mode-line-format Format of the category mode line (@pxref{Mode Line Formatting}). @item gnus-agent-short-article @vindex gnus-agent-short-article Articles that have fewer lines than this are short. Default 100. @item gnus-agent-long-article @vindex gnus-agent-long-article Articles that have more lines than this are long. Default 200. @item gnus-agent-low-score @vindex gnus-agent-low-score Articles that have a score lower than this have a low score. Default 0. @item gnus-agent-high-score @vindex gnus-agent-high-score Articles that have a score higher than this have a high score. Default 0. @item gnus-agent-expire-days @vindex gnus-agent-expire-days The number of days that a @samp{read} article must stay in the agent's local disk before becoming eligible for expiration (While the name is the same, this doesn't mean expiring the article on the server. It just means deleting the local copy of the article). What is also important to understand is that the counter starts with the time the article was written to the local disk and not the time the article was read. Default 7. @item gnus-agent-enable-expiration @vindex gnus-agent-enable-expiration Determines whether articles in a group are, by default, expired or retained indefinitely. The default is @code{ENABLE} which means that you'll have to disable expiration when desired. On the other hand, you could set this to @code{DISABLE}. In that case, you would then have to enable expiration in selected groups. @end table @node Agent Commands @subsection Agent Commands @findex gnus-agent-toggle-plugged @kindex J j (Agent) All the Gnus Agent commands are on the @kbd{J} submap. The @kbd{J j} (@code{gnus-agent-toggle-plugged}) command works in all modes, and toggles the plugged/unplugged state of the Gnus Agent. @menu * Group Agent Commands:: Configure groups and fetch their contents. * Summary Agent Commands:: Manually select then fetch specific articles. * Server Agent Commands:: Select the servers that are supported by the agent. @end menu @node Group Agent Commands @subsubsection Group Agent Commands @table @kbd @item J u @kindex J u (Agent Group) @findex gnus-agent-fetch-groups Fetch all eligible articles in the current group (@code{gnus-agent-fetch-groups}). @item J c @kindex J c (Agent Group) @findex gnus-enter-category-buffer Enter the Agent category buffer (@code{gnus-enter-category-buffer}). @item J s @kindex J s (Agent Group) @findex gnus-agent-fetch-session Fetch all eligible articles in all groups (@code{gnus-agent-fetch-session}). @item J S @kindex J S (Agent Group) @findex gnus-group-send-queue Send all sendable messages in the queue group (@code{gnus-group-send-queue}). @xref{Drafts}. @item J a @kindex J a (Agent Group) @findex gnus-agent-add-group Add the current group to an Agent category (@code{gnus-agent-add-group}). This command understands the process/prefix convention (@pxref{Process/Prefix}). @item J r @kindex J r (Agent Group) @findex gnus-agent-remove-group Remove the current group from its category, if any (@code{gnus-agent-remove-group}). This command understands the process/prefix convention (@pxref{Process/Prefix}). @item J Y @kindex J Y (Agent Group) @findex gnus-agent-synchronize-flags Synchronize flags changed while unplugged with remote server, if any. @end table @node Summary Agent Commands @subsubsection Summary Agent Commands @table @kbd @item J # @kindex J # (Agent Summary) @findex gnus-agent-mark-article Mark the article for downloading (@code{gnus-agent-mark-article}). @item J M-# @kindex J M-# (Agent Summary) @findex gnus-agent-unmark-article Remove the downloading mark from the article (@code{gnus-agent-unmark-article}). @cindex % @item @@ @kindex @@ (Agent Summary) @findex gnus-agent-toggle-mark Toggle whether to download the article (@code{gnus-agent-toggle-mark}). The download mark is @samp{%} by default. @item J c @kindex J c (Agent Summary) @findex gnus-agent-catchup Mark all articles as read (@code{gnus-agent-catchup}) that are neither cached, downloaded, nor downloadable. @item J S @kindex J S (Agent Summary) @findex gnus-agent-fetch-group Download all eligible (@pxref{Agent Categories}) articles in this group. (@code{gnus-agent-fetch-group}). @item J s @kindex J s (Agent Summary) @findex gnus-agent-fetch-series Download all processable articles in this group. (@code{gnus-agent-fetch-series}). @item J u @kindex J u (Agent Summary) @findex gnus-agent-summary-fetch-group Download all downloadable articles in the current group (@code{gnus-agent-summary-fetch-group}). @end table @node Server Agent Commands @subsubsection Server Agent Commands @table @kbd @item J a @kindex J a (Agent Server) @findex gnus-agent-add-server Add the current server to the list of servers covered by the Gnus Agent (@code{gnus-agent-add-server}). @item J r @kindex J r (Agent Server) @findex gnus-agent-remove-server Remove the current server from the list of servers covered by the Gnus Agent (@code{gnus-agent-remove-server}). @end table @node Agent Visuals @subsection Agent Visuals If you open a summary while unplugged and, Gnus knows from the group's active range that there are more articles than the headers currently stored in the Agent, you may see some articles whose subject looks something like @samp{[Undownloaded article #####]}. These are placeholders for the missing headers. Aside from setting a mark, there is not much that can be done with one of these placeholders. When Gnus finally gets a chance to fetch the group's headers, the placeholders will automatically be replaced by the actual headers. You can configure the summary buffer's maneuvering to skip over the placeholders if you care (See @code{gnus-auto-goto-ignores}). While it may be obvious to all, the only headers and articles available while unplugged are those headers and articles that were fetched into the Agent while previously plugged. To put it another way, If you forget to fetch something while plugged, you might have a less than satisfying unplugged session''. For this reason, the Agent adds two visual effects to your summary buffer. These effects display the download status of each article so that you always know which articles will be available when unplugged. The first visual effect is the @samp{%O} spec. If you customize @code{gnus-summary-line-format} to include this specifier, you will add a single character field that indicates an article's download status. Articles that have been fetched into either the Agent or the Cache, will display @code{gnus-downloaded-mark} (defaults to @samp{+}). All other articles will display @code{gnus-undownloaded-mark} (defaults to @samp{-}). If you open a group that has not been agentized, a space (@samp{ }) will be displayed. The second visual effect are the undownloaded faces. The faces, there are three indicating the article's score (low, normal, high), seem to result in a love/hate response from many Gnus users. The problem is that the face selection is controlled by a list of condition tests and face names (See @code{gnus-summary-highlight}). Each condition is tested in the order in which it appears in the list so early conditions have precedence over later conditions. All of this means that, if you tick an undownloaded article, the article will continue to be displayed in the undownloaded face rather than the ticked face. If you use the Agent as a cache (to avoid downloading the same article each time you visit it or to minimize your connection time), the undownloaded face will probably seem like a good idea. The reason being that you do all of our work (marking, reading, deleting) with downloaded articles so the normal faces always appear. For occasional Agent users, the undownloaded faces may appear to be an absolutely horrible idea. The issue being that, since most of their articles have not been fetched into the Agent, most of the normal faces will be obscured by the undownloaded faces. If this is your situation, you have two choices available. First, you can completely disable the undownload faces by customizing @code{gnus-summary-highlight} to delete the three cons-cells that refer to the @code{gnus-summary-*-undownloaded-face} faces. Second, if you prefer to take a more fine-grained approach, you may set the @code{agent-disable-undownloaded-faces} group parameter to @code{t}. This parameter, like all other agent parameters, may be set on an Agent Category (@pxref{Agent Categories}), a Group Topic (@pxref{Topic Parameters}), or an individual group (@pxref{Group Parameters}). @node Agent as Cache @subsection Agent as Cache When Gnus is plugged, it is not efficient to download headers or articles from the server again, if they are already stored in the Agent. So, Gnus normally only downloads headers once, and stores them in the Agent. These headers are later used when generating the summary buffer, regardless of whether you are plugged or unplugged. Articles are not cached in the Agent by default though (that would potentially consume lots of disk space), but if you have already downloaded an article into the Agent, Gnus will not download the article from the server again but use the locally stored copy instead. If you so desire, you can configure the agent (see @code{gnus-agent-cache} @pxref{Agent Variables}) to always download headers and articles while plugged. Gnus will almost certainly be slower, but it will be kept synchronized with the server. That last point probably won't make any sense if you are using a nntp or nnimap back end. @node Agent Expiry @subsection Agent Expiry @vindex gnus-agent-expire-days @findex gnus-agent-expire @kindex M-x gnus-agent-expire @kindex M-x gnus-agent-expire-group @findex gnus-agent-expire-group @cindex agent expiry @cindex Gnus agent expiry @cindex expiry, in Gnus agent The Agent back end, @code{nnagent}, doesn't handle expiry. Well, at least it doesn't handle it like other back ends. Instead, there are special @code{gnus-agent-expire} and @code{gnus-agent-expire-group} commands that will expire all read articles that are older than @code{gnus-agent-expire-days} days. They can be run whenever you feel that you're running out of space. Neither are particularly fast or efficient, and it's not a particularly good idea to interrupt them (with @kbd{C-g} or anything else) once you've started one of them. Note that other functions, e.g. @code{gnus-request-expire-articles}, might run @code{gnus-agent-expire} for you to keep the agent synchronized with the group. The agent parameter @code{agent-enable-expiration} may be used to prevent expiration in selected groups. @vindex gnus-agent-expire-all If @code{gnus-agent-expire-all} is non-@code{nil}, the agent expiration commands will expire all articles---unread, read, ticked and dormant. If @code{nil} (which is the default), only read articles are eligible for expiry, and unread, ticked and dormant articles will be kept indefinitely. If you find that some articles eligible for expiry are never expired, perhaps some Gnus Agent files are corrupted. There's are special commands, @code{gnus-agent-regenerate} and @code{gnus-agent-regenerate-group}, to fix possible problems. @node Agent Regeneration @subsection Agent Regeneration @cindex agent regeneration @cindex Gnus agent regeneration @cindex regeneration The local data structures used by @code{nnagent} may become corrupted due to certain exceptional conditions. When this happens, @code{nnagent} functionality may degrade or even fail. The solution to this problem is to repair the local data structures by removing all internal inconsistencies. For example, if your connection to your server is lost while downloaded articles into the agent, the local data structures will not know about articles successfully downloaded prior to the connection failure. Running @code{gnus-agent-regenerate} or @code{gnus-agent-regenerate-group} will update the data structures such that you don't need to download these articles a second time. @findex gnus-agent-regenerate @kindex M-x gnus-agent-regenerate The command @code{gnus-agent-regenerate} will perform @code{gnus-agent-regenerate-group} on every agentized group. While you can run @code{gnus-agent-regenerate} in any buffer, it is strongly recommended that you first close all summary buffers. @findex gnus-agent-regenerate-group @kindex M-x gnus-agent-regenerate-group The command @code{gnus-agent-regenerate-group} uses the local copies of individual articles to repair the local @acronym{NOV}(header) database. It then updates the internal data structures that document which articles are stored locally. An optional argument will mark articles in the agent as unread. @node Agent and IMAP @subsection Agent and IMAP The Agent works with any Gnus back end, including nnimap. However, since there are some conceptual differences between @acronym{NNTP} and @acronym{IMAP}, this section (should) provide you with some information to make Gnus Agent work smoother as a @acronym{IMAP} Disconnected Mode client. The first thing to keep in mind is that all flags (read, ticked, etc) are kept on the @acronym{IMAP} server, rather than in @file{.newsrc} as is the case for nntp. Thus Gnus need to remember flag changes when disconnected, and synchronize these flags when you plug back in. Gnus keeps track of flag changes when reading nnimap groups under the Agent. When you plug back in, Gnus will check if you have any changed any flags and ask if you wish to synchronize these with the server. The behavior is customizable by @code{gnus-agent-synchronize-flags}. @vindex gnus-agent-synchronize-flags If @code{gnus-agent-synchronize-flags} is @code{nil}, the Agent will never automatically synchronize flags. If it is @code{ask}, which is the default, the Agent will check if you made any changes and if so ask if you wish to synchronize these when you re-connect. If it has any other value, all flags will be synchronized automatically. If you do not wish to synchronize flags automatically when you re-connect, you can do it manually with the @code{gnus-agent-synchronize-flags} command that is bound to @kbd{J Y} in the group buffer. Some things are currently not implemented in the Agent that you'd might expect from a disconnected @acronym{IMAP} client, including: @itemize @bullet @item Copying/moving articles into nnimap groups when unplugged. @item Creating/deleting nnimap groups when unplugged. @end itemize Technical note: the synchronization algorithm does not work by pushing'' all local flags to the server, but rather incrementally update the server view of flags by changing only those flags that were changed by the user. Thus, if you set one flag on an article, quit the group and re-select the group and remove the flag; the flag will be set and removed from the server when you synchronize''. The queued flag operations can be found in the per-server @code{flags} file in the Agent directory. It's emptied when you synchronize flags. @node Outgoing Messages @subsection Outgoing Messages When Gnus is unplugged, all outgoing messages (both mail and news) are stored in the draft group queue'' (@pxref{Drafts}). You can view them there after posting, and edit them at will. When Gnus is plugged again, you can send the messages either from the draft group with the special commands available there, or you can use the @kbd{J S} command in the group buffer to send all the sendable messages in the draft group. @node Agent Variables @subsection Agent Variables @table @code @item gnus-agent-directory @vindex gnus-agent-directory Where the Gnus Agent will store its files. The default is @file{~/News/agent/}. @item gnus-agent-handle-level @vindex gnus-agent-handle-level Groups on levels (@pxref{Group Levels}) higher than this variable will be ignored by the Agent. The default is @code{gnus-level-subscribed}, which means that only subscribed group will be considered by the Agent by default. @item gnus-agent-plugged-hook @vindex gnus-agent-plugged-hook Hook run when connecting to the network. @item gnus-agent-unplugged-hook @vindex gnus-agent-unplugged-hook Hook run when disconnecting from the network. @item gnus-agent-fetched-hook @vindex gnus-agent-fetched-hook Hook run when finished fetching articles. @item gnus-agent-cache @vindex gnus-agent-cache Variable to control whether use the locally stored @acronym{NOV} and articles when plugged, e.g. essentially using the Agent as a cache. The default is non-@code{nil}, which means to use the Agent as a cache. @item gnus-agent-go-online @vindex gnus-agent-go-online If @code{gnus-agent-go-online} is @code{nil}, the Agent will never automatically switch offline servers into online status. If it is @code{ask}, the default, the Agent will ask if you wish to switch offline servers into online status when you re-connect. If it has any other value, all offline servers will be automatically switched into online status. @item gnus-agent-mark-unread-after-downloaded @vindex gnus-agent-mark-unread-after-downloaded If @code{gnus-agent-mark-unread-after-downloaded} is non-@code{nil}, mark articles as unread after downloading. This is usually a safe thing to do as the newly downloaded article has obviously not been read. The default is @code{t}. @item gnus-agent-consider-all-articles @vindex gnus-agent-consider-all-articles If @code{gnus-agent-consider-all-articles} is non-@code{nil}, the agent will let the agent predicate decide whether articles need to be downloaded or not, for all articles. When @code{nil}, the default, the agent will only let the predicate decide whether unread articles are downloaded or not. If you enable this, you may also want to look into the agent expiry settings (@pxref{Category Variables}), so that the agent doesn't download articles which the agent will later expire, over and over again. @item gnus-agent-max-fetch-size @vindex gnus-agent-max-fetch-size The agent fetches articles into a temporary buffer prior to parsing them into individual files. To avoid exceeding the max. buffer size, the agent alternates between fetching and parsing until all articles have been fetched. @code{gnus-agent-max-fetch-size} provides a size limit to control how often the cycling occurs. A large value improves performance. A small value minimizes the time lost should the connection be lost while fetching (You may need to run @code{gnus-agent-regenerate-group} to update the group's state. However, all articles parsed prior to loosing the connection will be available while unplugged). The default is 10M so it is unusual to see any cycling. @item gnus-server-unopen-status @vindex gnus-server-unopen-status Perhaps not an Agent variable, but closely related to the Agent, this variable says what will happen if Gnus cannot open a server. If the Agent is enabled, the default, @code{nil}, makes Gnus ask the user whether to deny the server or whether to unplug the agent. If the Agent is disabled, Gnus always simply deny the server. Other choices for this variable include @code{denied} and @code{offline} the latter is only valid if the Agent is used. @item gnus-auto-goto-ignores @vindex gnus-auto-goto-ignores Another variable that isn't an Agent variable, yet so closely related that most will look for it here, this variable tells the summary buffer how to maneuver around undownloaded (only headers stored in the agent) and unfetched (neither article nor headers stored) articles. The valid values are @code{nil} (maneuver to any article), @code{undownloaded} (maneuvering while unplugged ignores articles that have not been fetched), @code{always-undownloaded} (maneuvering always ignores articles that have not been fetched), @code{unfetched} (maneuvering ignores articles whose headers have not been fetched). @item gnus-agent-auto-agentize-methods @vindex gnus-agent-auto-agentize-methods If you have never used the Agent before (or more technically, if @file{~/News/agent/lib/servers} does not exist), Gnus will automatically agentize a few servers for you. This variable control which backends should be auto-agentized. It is typically only useful to agentize remote backends. The auto-agentizing has the same effect as running @kbd{J a} on the servers (@pxref{Server Agent Commands}). If the file exist, you must manage the servers manually by adding or removing them, this variable is only applicable the first time you start Gnus. The default is @samp{(nntp nnimap)}. @end table @node Example Setup @subsection Example Setup If you don't want to read this manual, and you have a fairly standard setup, you may be able to use something like the following as your @file{~/.gnus.el} file to get started. @lisp ;; @r{Define how Gnus is to fetch news. We do this over @acronym{NNTP}} ;; @r{from your ISP's server.} (setq gnus-select-method '(nntp "news.your-isp.com")) ;; @r{Define how Gnus is to read your mail. We read mail from} ;; @r{your ISP's @acronym{POP} server.} (setq mail-sources '((pop :server "pop.your-isp.com"))) ;; @r{Say how Gnus is to store the mail. We use nnml groups.} (setq gnus-secondary-select-methods '((nnml ""))) ;; @r{Make Gnus into an offline newsreader.} ;; (gnus-agentize) ; @r{The obsolete setting.} ;; (setq gnus-agent t) ; @r{Now the default.} @end lisp That should be it, basically. Put that in your @file{~/.gnus.el} file, edit to suit your needs, start up PPP (or whatever), and type @kbd{M-x gnus}. If this is the first time you've run Gnus, you will be subscribed automatically to a few default newsgroups. You'll probably want to subscribe to more groups, and to do that, you have to query the @acronym{NNTP} server for a complete list of groups with the @kbd{A A} command. This usually takes quite a while, but you only have to do it once. After reading and parsing a while, you'll be presented with a list of groups. Subscribe to the ones you want to read with the @kbd{u} command. @kbd{l} to make all the killed groups disappear after you've subscribe to all the groups you want to read. (@kbd{A k} will bring back all the killed groups.) You can now read the groups at once, or you can download the articles with the @kbd{J s} command. And then read the rest of this manual to find out which of the other gazillion things you want to customize. @node Batching Agents @subsection Batching Agents @findex gnus-agent-batch Having the Gnus Agent fetch articles (and post whatever messages you've written) is quite easy once you've gotten things set up properly. The following shell script will do everything that is necessary: You can run a complete batch command from the command line with the following incantation: @example #!/bin/sh emacs -batch -l ~/.emacs -l ~/.gnus.el -f gnus-agent-batch >/dev/null 2>&1 @end example @node Agent Caveats @subsection Agent Caveats The Gnus Agent doesn't seem to work like most other offline newsreaders. Here are some common questions that some imaginary people may ask: @table @dfn @item If I read an article while plugged, do they get entered into the Agent? @strong{No}. If you want this behavior, add @code{gnus-agent-fetch-selected-article} to @code{gnus-select-article-hook}. @item If I read an article while plugged, and the article already exists in the Agent, will it get downloaded once more? @strong{No}, unless @code{gnus-agent-cache} is @code{nil}. @end table In short, when Gnus is unplugged, it only looks into the locally stored articles; when it's plugged, it talks to your ISP and may also use the locally stored articles. @node Scoring @chapter Scoring @cindex scoring Other people use @dfn{kill files}, but we here at Gnus Towers like scoring better than killing, so we'd rather switch than fight. They do something completely different as well, so sit up straight and pay attention! @vindex gnus-summary-mark-below All articles have a default score (@code{gnus-summary-default-score}), which is 0 by default. This score may be raised or lowered either interactively or by score files. Articles that have a score lower than @code{gnus-summary-mark-below} are marked as read. Gnus will read any @dfn{score files} that apply to the current group before generating the summary buffer. There are several commands in the summary buffer that insert score entries based on the current article. You can, for instance, ask Gnus to lower or increase the score of all articles with a certain subject. There are two sorts of scoring entries: Permanent and temporary. Temporary score entries are self-expiring entries. Any entries that are temporary and have not been used for, say, a week, will be removed silently to help keep the sizes of the score files down. @menu * Summary Score Commands:: Adding score entries for the current group. * Group Score Commands:: General score commands. * Score Variables:: Customize your scoring. (My, what terminology). * Score File Format:: What a score file may contain. * Score File Editing:: You can edit score files by hand as well. * Adaptive Scoring:: Big Sister Gnus knows what you read. * Home Score File:: How to say where new score entries are to go. * Followups To Yourself:: Having Gnus notice when people answer you. * Scoring On Other Headers:: Scoring on non-standard headers. * Scoring Tips:: How to score effectively. * Reverse Scoring:: That problem child of old is not problem. * Global Score Files:: Earth-spanning, ear-splitting score files. * Kill Files:: They are still here, but they can be ignored. * Converting Kill Files:: Translating kill files to score files. * GroupLens:: Getting predictions on what you like to read. * Advanced Scoring:: Using logical expressions to build score rules. * Score Decays:: It can be useful to let scores wither away. @end menu @node Summary Score Commands @section Summary Score Commands @cindex score commands The score commands that alter score entries do not actually modify real score files. That would be too inefficient. Gnus maintains a cache of previously loaded score files, one of which is considered the @dfn{current score file alist}. The score commands simply insert entries into this list, and upon group exit, this list is saved. The current score file is by default the group's local score file, even if no such score file actually exists. To insert score commands into some other score file (e.g. @file{all.SCORE}), you must first make this score file the current one. General score commands that don't actually change the score file: @table @kbd @item V s @kindex V s (Summary) @findex gnus-summary-set-score Set the score of the current article (@code{gnus-summary-set-score}). @item V S @kindex V S (Summary) @findex gnus-summary-current-score Display the score of the current article (@code{gnus-summary-current-score}). @item V t @kindex V t (Summary) @findex gnus-score-find-trace Display all score rules that have been used on the current article (@code{gnus-score-find-trace}). In the @code{*Score Trace*} buffer, you may type @kbd{e} to edit score file corresponding to the score rule on current line and @kbd{f} to format (@code{gnus-score-pretty-print}) the score file and edit it. @item V w @kindex V w (Summary) @findex gnus-score-find-favourite-words List words used in scoring (@code{gnus-score-find-favourite-words}). @item V R @kindex V R (Summary) @findex gnus-summary-rescore Run the current summary through the scoring process (@code{gnus-summary-rescore}). This might be useful if you're playing around with your score files behind Gnus' back and want to see the effect you're having. @item V c @kindex V c (Summary) @findex gnus-score-change-score-file Make a different score file the current (@code{gnus-score-change-score-file}). @item V e @kindex V e (Summary) @findex gnus-score-edit-current-scores Edit the current score file (@code{gnus-score-edit-current-scores}). You will be popped into a @code{gnus-score-mode} buffer (@pxref{Score File Editing}). @item V f @kindex V f (Summary) @findex gnus-score-edit-file Edit a score file and make this score file the current one (@code{gnus-score-edit-file}). @item V F @kindex V F (Summary) @findex gnus-score-flush-cache Flush the score cache (@code{gnus-score-flush-cache}). This is useful after editing score files. @item V C @kindex V C (Summary) @findex gnus-score-customize Customize a score file in a visually pleasing manner (@code{gnus-score-customize}). @end table The rest of these commands modify the local score file. @table @kbd @item V m @kindex V m (Summary) @findex gnus-score-set-mark-below Prompt for a score, and mark all articles with a score below this as read (@code{gnus-score-set-mark-below}). @item V x @kindex V x (Summary) @findex gnus-score-set-expunge-below Prompt for a score, and add a score rule to the current score file to expunge all articles below this score (@code{gnus-score-set-expunge-below}). @end table The keystrokes for actually making score entries follow a very regular pattern, so there's no need to list all the commands. (Hundreds of them.) @findex gnus-summary-increase-score @findex gnus-summary-lower-score @enumerate @item The first key is either @kbd{I} (upper case i) for increasing the score or @kbd{L} for lowering the score. @item The second key says what header you want to score on. The following keys are available: @table @kbd @item a Score on the author name. @item s Score on the subject line. @item x Score on the @code{Xref} line---i.e., the cross-posting line. @item r Score on the @code{References} line. @item d Score on the date. @item l Score on the number of lines. @item i Score on the @code{Message-ID} header. @item e Score on an extra'' header, that is, one of those in gnus-extra-headers, if your @acronym{NNTP} server tracks additional header data in overviews. @item f Score on followups---this matches the author name, and adds scores to the followups to this author. (Using this key leads to the creation of @file{ADAPT} files.) @item b Score on the body. @item h Score on the head. @item t Score on thread. (Using this key leads to the creation of @file{ADAPT} files.) @end table @item The third key is the match type. Which match types are valid depends on what headers you are scoring on. @table @code @item strings @table @kbd @item e Exact matching. @item s Substring matching. @item f Fuzzy matching (@pxref{Fuzzy Matching}). @item r Regexp matching @end table @item date @table @kbd @item b Before date. @item a After date. @item n This date. @end table @item number @table @kbd @item < Less than number. @item = Equal to number. @item > Greater than number. @end table @end table @item The fourth and usually final key says whether this is a temporary (i.e., expiring) score entry, or a permanent (i.e., non-expiring) score entry, or whether it is to be done immediately, without adding to the score file. @table @kbd @item t Temporary score entry. @item p Permanent score entry. @item i Immediately scoring. @end table @item If you are scoring on e' (extra) headers, you will then be prompted for the header name on which you wish to score. This must be a header named in gnus-extra-headers, and @samp{TAB} completion is available. @end enumerate So, let's say you want to increase the score on the current author with exact matching permanently: @kbd{I a e p}. If you want to lower the score based on the subject line, using substring matching, and make a temporary score entry: @kbd{L s s t}. Pretty easy. To make things a bit more complicated, there are shortcuts. If you use a capital letter on either the second or third keys, Gnus will use defaults for the remaining one or two keystrokes. The defaults are substring'' and temporary''. So @kbd{I A} is the same as @kbd{I a s t}, and @kbd{I a R} is the same as @kbd{I a r t}. These functions take both the numerical prefix and the symbolic prefix (@pxref{Symbolic Prefixes}). A numerical prefix says how much to lower (or increase) the score of the article. A symbolic prefix of @code{a} says to use the @file{all.SCORE} file for the command instead of the current score file. @vindex gnus-score-mimic-keymap The @code{gnus-score-mimic-keymap} says whether these commands will pretend they are keymaps or not. @node Group Score Commands @section Group Score Commands @cindex group score commands There aren't many of these as yet, I'm afraid. @table @kbd @item W f @kindex W f (Group) @findex gnus-score-flush-cache Gnus maintains a cache of score alists to avoid having to reload them all the time. This command will flush the cache (@code{gnus-score-flush-cache}). @end table You can do scoring from the command line by saying something like: @findex gnus-batch-score @cindex batch scoring @example$ emacs -batch -l ~/.emacs -l ~/.gnus.el -f gnus-batch-score
@end example

@node Score Variables
@section Score Variables
@cindex score variables

@table @code

@item gnus-use-scoring
@vindex gnus-use-scoring
If @code{nil}, Gnus will not check for score files, and will not, in
general, do any score-related work.  This is @code{t} by default.

@item gnus-kill-killed
@vindex gnus-kill-killed
If this variable is @code{nil}, Gnus will never apply score files to
articles that have already been through the kill process.  While this
may save you lots of time, it also means that if you apply a kill file
to a group, and then change the kill file and want to run it over you
group again to kill more articles, it won't work.  You have to set this
variable to @code{t} to do that.  (It is @code{t} by default.)

@item gnus-kill-files-directory
@vindex gnus-kill-files-directory
All kill and score files will be stored in this directory, which is
initialized from the @env{SAVEDIR} environment variable by default.
This is @file{~/News/} by default.

@item gnus-score-file-suffix
@vindex gnus-score-file-suffix
Suffix to add to the group name to arrive at the score file name
(@file{SCORE} by default.)

@item gnus-score-uncacheable-files
@vindex gnus-score-uncacheable-files
@cindex score cache
score files.  However, if this might make your Emacs grow big and
bloated, so this regexp can be used to weed out score files unlikely
to be needed again.  It would be a bad idea to deny caching of
@file{all.SCORE}, while it might be a good idea to not cache
variable is @samp{ADAPT$} by default, so no adaptive score files will be cached. @item gnus-save-score @vindex gnus-save-score If you have really complicated score files, and do lots of batch scoring, then you might set this variable to @code{t}. This will make Gnus save the scores into the @file{.newsrc.eld} file. If you do not set this to @code{t}, then manual scores (like those set with @kbd{V s} (@code{gnus-summary-set-score})) will not be preserved across group visits. @item gnus-score-interactive-default-score @vindex gnus-score-interactive-default-score Score used by all the interactive raise/lower commands to raise/lower score with. Default is 1000, which may seem excessive, but this is to ensure that the adaptive scoring scheme gets enough room to play with. We don't want the small changes from the adaptive scoring to overwrite manually entered data. @item gnus-summary-default-score @vindex gnus-summary-default-score Default score of an article, which is 0 by default. @item gnus-summary-expunge-below @vindex gnus-summary-expunge-below Don't display the summary lines of articles that have scores lower than this variable. This is @code{nil} by default, which means that no articles will be hidden. This variable is local to the summary buffers, and has to be set from @code{gnus-summary-mode-hook}. @item gnus-score-over-mark @vindex gnus-score-over-mark Mark (in the third column) used for articles with a score over the default. Default is @samp{+}. @item gnus-score-below-mark @vindex gnus-score-below-mark Mark (in the third column) used for articles with a score below the default. Default is @samp{-}. @item gnus-score-find-score-files-function @vindex gnus-score-find-score-files-function Function used to find score files for the current group. This function is called with the name of the group as the argument. Predefined functions available are: @table @code @item gnus-score-find-single @findex gnus-score-find-single Only apply the group's own score file. @item gnus-score-find-bnews @findex gnus-score-find-bnews Apply all score files that match, using bnews syntax. This is the default. If the current group is @samp{gnu.emacs.gnus}, for instance, @file{all.emacs.all.SCORE}, @file{not.alt.all.SCORE} and @file{gnu.all.SCORE} would all apply. In short, the instances of @samp{all} in the score file names are translated into @samp{.*}, and then a regexp match is done. This means that if you have some score entries that you want to apply to all groups, then you put those entries in the @file{all.SCORE} file. The score files are applied in a semi-random order, although Gnus will try to apply the more general score files before the more specific score files. It does this by looking at the number of elements in the score file names---discarding the @samp{all} elements. @item gnus-score-find-hierarchical @findex gnus-score-find-hierarchical Apply all score files from all the parent groups. This means that you can't have score files like @file{all.SCORE}, but you can have @file{SCORE}, @file{comp.SCORE} and @file{comp.emacs.SCORE} for each server. @end table This variable can also be a list of functions. In that case, all these functions will be called with the group name as argument, and all the returned lists of score files will be applied. These functions can also return lists of lists of score alists directly. In that case, the functions that return these non-file score alists should probably be placed before the real'' score file functions, to ensure that the last score file returned is the local score file. Phu. For example, to do hierarchical scoring but use a non-server-specific overall score file, you could use the value @example (list (lambda (group) ("all.SCORE")) 'gnus-score-find-hierarchical) @end example @item gnus-score-expiry-days @vindex gnus-score-expiry-days This variable says how many days should pass before an unused score file entry is expired. If this variable is @code{nil}, no score file entries are expired. It's 7 by default. @item gnus-update-score-entry-dates @vindex gnus-update-score-entry-dates If this variable is non-@code{nil}, temporary score entries that have been triggered (matched) will have their dates updated. (This is how Gnus controls expiry---all non-matched-entries will become too old while matched entries will stay fresh and young.) However, if you set this variable to @code{nil}, even matched entries will grow old and will have to face that oh-so grim reaper. @item gnus-score-after-write-file-function @vindex gnus-score-after-write-file-function Function called with the name of the score file just written. @item gnus-score-thread-simplify @vindex gnus-score-thread-simplify If this variable is non-@code{nil}, article subjects will be simplified for subject scoring purposes in the same manner as with threading---according to the current value of @code{gnus-simplify-subject-functions}. If the scoring entry uses @code{substring} or @code{exact} matching, the match will also be simplified in this manner. @end table @node Score File Format @section Score File Format @cindex score file format A score file is an @code{emacs-lisp} file that normally contains just a single form. Casual users are not expected to edit these files; everything can be changed from the summary buffer. Anyway, if you'd like to dig into it yourself, here's an example: @lisp (("from" ("Lars Ingebrigtsen" -10000) ("Per Abrahamsen") ("larsi\\|lmi" -50000 nil R)) ("subject" ("Ding is Badd" nil 728373)) ("xref" ("alt.politics" -1000 728372 s)) ("lines" (2 -100 nil <)) (mark 0) (expunge -1000) (mark-and-expunge -10) (read-only nil) (orphan -10) (adapt t) (files "/hom/larsi/News/gnu.SCORE") (exclude-files "all.SCORE") (local (gnus-newsgroup-auto-expire t) (gnus-summary-make-false-root empty)) (eval (ding))) @end lisp This example demonstrates most score file elements. @xref{Advanced Scoring}, for a different approach. Even though this looks much like Lisp code, nothing here is actually @code{eval}ed. The Lisp reader is used to read this form, though, so it has to be valid syntactically, if not semantically. Six keys are supported by this alist: @table @code @item STRING If the key is a string, it is the name of the header to perform the match on. Scoring can only be performed on these eight headers: @code{From}, @code{Subject}, @code{References}, @code{Message-ID}, @code{Xref}, @code{Lines}, @code{Chars} and @code{Date}. In addition to these headers, there are three strings to tell Gnus to fetch the entire article and do the match on larger parts of the article: @code{Body} will perform the match on the body of the article, @code{Head} will perform the match on the head of the article, and @code{All} will perform the match on the entire article. Note that using any of these last three keys will slow down group entry @emph{considerably}. The final header'' you can score on is @code{Followup}. These score entries will result in new score entries being added for all follow-ups to articles that matches these score entries. Following this key is an arbitrary number of score entries, where each score entry has one to four elements. @enumerate @item The first element is the @dfn{match element}. On most headers this will be a string, but on the Lines and Chars headers, this must be an integer. @item If the second element is present, it should be a number---the @dfn{score element}. This number should be an integer in the neginf to posinf interval. This number is added to the score of the article if the match is successful. If this element is not present, the @code{gnus-score-interactive-default-score} number will be used instead. This is 1000 by default. @item If the third element is present, it should be a number---the @dfn{date element}. This date says when the last time this score entry matched, which provides a mechanism for expiring the score entries. It this element is not present, the score entry is permanent. The date is represented by the number of days since December 31, 1 BCE. @item If the fourth element is present, it should be a symbol---the @dfn{type element}. This element specifies what function should be used to see whether this score entry matches the article. What match types that can be used depends on what header you wish to perform the match on. @table @dfn @item From, Subject, References, Xref, Message-ID For most header types, there are the @code{r} and @code{R} (regexp), as well as @code{s} and @code{S} (substring) types, and @code{e} and @code{E} (exact match), and @code{w} (word match) types. If this element is not present, Gnus will assume that substring matching should be used. @code{R}, @code{S}, and @code{E} differ from the others in that the matches will be done in a case-sensitive manner. All these one-letter types are really just abbreviations for the @code{regexp}, @code{string}, @code{exact}, and @code{word} types, which you can use instead, if you feel like. @item Extra Just as for the standard string overview headers, if you are using gnus-extra-headers, you can score on these headers' values. In this case, there is a 5th element in the score entry, being the name of the header to be scored. The following entry is useful in your @file{all.SCORE} file in case of spam attacks from a single origin host, if your @acronym{NNTP} server tracks @samp{NNTP-Posting-Host} in overviews: @lisp ("111.222.333.444" -1000 nil s "NNTP-Posting-Host") @end lisp @item Lines, Chars These two headers use different match types: @code{<}, @code{>}, @code{=}, @code{>=} and @code{<=}. These predicates are true if @example (PREDICATE HEADER MATCH) @end example evaluates to non-@code{nil}. For instance, the advanced match @code{("lines" 4 <)} (@pxref{Advanced Scoring}) will result in the following form: @lisp (< header-value 4) @end lisp Or to put it another way: When using @code{<} on @code{Lines} with 4 as the match, we get the score added if the article has less than 4 lines. (It's easy to get confused and think it's the other way around. But it's not. I think.) When matching on @code{Lines}, be careful because some back ends (like @code{nndir}) do not generate @code{Lines} header, so every article ends up being marked as having 0 lines. This can lead to strange results if you happen to lower score of the articles with few lines. @item Date For the Date header we have three kinda silly match types: @code{before}, @code{at} and @code{after}. I can't really imagine this ever being useful, but, like, it would feel kinda silly not to provide this function. Just in case. You never know. Better safe than sorry. Once burnt, twice shy. Don't judge a book by its cover. Never not have sex on a first date. (I have been told that at least one person, and I quote, found this function indispensable'', however.) @cindex ISO8601 @cindex date A more useful match type is @code{regexp}. With it, you can match the date string using a regular expression. The date is normalized to ISO8601 compact format first---@var{YYYYMMDD}@code{T}@var{HHMMSS}. If you want to match all articles that have been posted on April 1st in every year, you could use @samp{....0401.........} as a match string, for instance. (Note that the date is kept in its original time zone, so this will match articles that were posted when it was April 1st where the article was posted from. Time zones are such wholesome fun for the whole family, eh?) @item Head, Body, All These three match keys use the same match types as the @code{From} (etc) header uses. @item Followup This match key is somewhat special, in that it will match the @code{From} header, and affect the score of not only the matching articles, but also all followups to the matching articles. This allows you e.g. increase the score of followups to your own articles, or decrease the score of followups to the articles of some known trouble-maker. Uses the same match types as the @code{From} header uses. (Using this match key will lead to creation of @file{ADAPT} files.) @item Thread This match key works along the same lines as the @code{Followup} match key. If you say that you want to score on a (sub-)thread started by an article with a @code{Message-ID} @var{x}, then you add a @samp{thread} match. This will add a new @samp{thread} match for each article that has @var{x} in its @code{References} header. (These new @samp{thread} matches will use the @code{Message-ID}s of these matching articles.) This will ensure that you can raise/lower the score of an entire thread, even though some articles in the thread may not have complete @code{References} headers. Note that using this may lead to undeterministic scores of the articles in the thread. (Using this match key will lead to creation of @file{ADAPT} files.) @end table @end enumerate @cindex score file atoms @item mark The value of this entry should be a number. Any articles with a score lower than this number will be marked as read. @item expunge The value of this entry should be a number. Any articles with a score lower than this number will be removed from the summary buffer. @item mark-and-expunge The value of this entry should be a number. Any articles with a score lower than this number will be marked as read and removed from the summary buffer. @item thread-mark-and-expunge The value of this entry should be a number. All articles that belong to a thread that has a total score below this number will be marked as read and removed from the summary buffer. @code{gnus-thread-score-function} says how to compute the total score for a thread. @item files The value of this entry should be any number of file names. These files are assumed to be score files as well, and will be loaded the same way this one was. @item exclude-files The clue of this entry should be any number of files. These files will not be loaded, even though they would normally be so, for some reason or other. @item eval The value of this entry will be @code{eval}el. This element will be ignored when handling global score files. @item read-only Read-only score files will not be updated or saved. Global score files should feature this atom (@pxref{Global Score Files}). (Note: @dfn{Global} here really means @dfn{global}; not your personal apply-to-all-groups score files.) @item orphan The value of this entry should be a number. Articles that do not have parents will get this number added to their scores. Imagine you follow some high-volume newsgroup, like @samp{comp.lang.c}. Most likely you will only follow a few of the threads, also want to see any new threads. You can do this with the following two score file entries: @example (orphan -500) (mark-and-expunge -100) @end example When you enter the group the first time, you will only see the new threads. You then raise the score of the threads that you find interesting (with @kbd{I T} or @kbd{I S}), and ignore (@kbd{C y}) the rest. Next time you enter the group, you will see new articles in the interesting threads, plus any new threads. I.e.---the orphan score atom is for high-volume groups where a few interesting threads which can't be found automatically by ordinary scoring rules exist. @item adapt This entry controls the adaptive scoring. If it is @code{t}, the default adaptive scoring rules will be used. If it is @code{ignore}, no adaptive scoring will be performed on this group. If it is a list, this list will be used as the adaptive scoring rules. If it isn't present, or is something other than @code{t} or @code{ignore}, the default adaptive scoring rules will be used. If you want to use adaptive scoring on most groups, you'd set @code{gnus-use-adaptive-scoring} to @code{t}, and insert an @code{(adapt ignore)} in the groups where you do not want adaptive scoring. If you only want adaptive scoring in a few groups, you'd set @code{gnus-use-adaptive-scoring} to @code{nil}, and insert @code{(adapt t)} in the score files of the groups where you want it. @item adapt-file All adaptive score entries will go to the file named by this entry. It will also be applied when entering the group. This atom might be handy if you want to adapt on several groups at once, using the same adaptive file for a number of groups. @item local @cindex local variables The value of this entry should be a list of @code{(@var{var} @var{value})} pairs. Each @var{var} will be made buffer-local to the current summary buffer, and set to the value specified. This is a convenient, if somewhat strange, way of setting variables in some groups if you don't like hooks much. Note that the @var{value} won't be evaluated. @end table @node Score File Editing @section Score File Editing You normally enter all scoring commands from the summary buffer, but you might feel the urge to edit them by hand as well, so we've supplied you with a mode for that. It's simply a slightly customized @code{emacs-lisp} mode, with these additional commands: @table @kbd @item C-c C-c @kindex C-c C-c (Score) @findex gnus-score-edit-done Save the changes you have made and return to the summary buffer (@code{gnus-score-edit-done}). @item C-c C-d @kindex C-c C-d (Score) @findex gnus-score-edit-insert-date Insert the current date in numerical format (@code{gnus-score-edit-insert-date}). This is really the day number, if you were wondering. @item C-c C-p @kindex C-c C-p (Score) @findex gnus-score-pretty-print The adaptive score files are saved in an unformatted fashion. If you intend to read one of these files, you want to @dfn{pretty print} it first. This command (@code{gnus-score-pretty-print}) does that for you. @end table Type @kbd{M-x gnus-score-mode} to use this mode. @vindex gnus-score-mode-hook @code{gnus-score-menu-hook} is run in score mode buffers. In the summary buffer you can use commands like @kbd{V f}, @kbd{V e} and @kbd{V t} to begin editing score files. @node Adaptive Scoring @section Adaptive Scoring @cindex adaptive scoring If all this scoring is getting you down, Gnus has a way of making it all happen automatically---as if by magic. Or rather, as if by artificial stupidity, to be precise. @vindex gnus-use-adaptive-scoring When you read an article, or mark an article as read, or kill an article, you leave marks behind. On exit from the group, Gnus can sniff these marks and add score elements depending on what marks it finds. You turn on this ability by setting @code{gnus-use-adaptive-scoring} to @code{t} or @code{(line)}. If you want score adaptively on separate words appearing in the subjects, you should set this variable to @code{(word)}. If you want to use both adaptive methods, set this variable to @code{(word line)}. @vindex gnus-default-adaptive-score-alist To give you complete control over the scoring process, you can customize the @code{gnus-default-adaptive-score-alist} variable. For instance, it might look something like this: @lisp (setq gnus-default-adaptive-score-alist '((gnus-unread-mark) (gnus-ticked-mark (from 4)) (gnus-dormant-mark (from 5)) (gnus-del-mark (from -4) (subject -1)) (gnus-read-mark (from 4) (subject 2)) (gnus-expirable-mark (from -1) (subject -1)) (gnus-killed-mark (from -1) (subject -3)) (gnus-kill-file-mark) (gnus-ancient-mark) (gnus-low-score-mark) (gnus-catchup-mark (from -1) (subject -1)))) @end lisp As you see, each element in this alist has a mark as a key (either a variable name or a real'' mark---a character). Following this key is a arbitrary number of header/score pairs. If there are no header/score pairs following the key, no adaptive scoring will be done on articles that have that key as the article mark. For instance, articles with @code{gnus-unread-mark} in the example above will not get adaptive score entries. Each article can have only one mark, so just a single of these rules will be applied to each article. To take @code{gnus-del-mark} as an example---this alist says that all articles that have that mark (i.e., are marked with @samp{e}) will have a score entry added to lower based on the @code{From} header by -4, and lowered by @code{Subject} by -1. Change this to fit your prejudices. If you have marked 10 articles with the same subject with @code{gnus-del-mark}, the rule for that mark will be applied ten times. That means that that subject will get a score of ten times -1, which should be, unless I'm much mistaken, -10. If you have auto-expirable (mail) groups (@pxref{Expiring Mail}), all the read articles will be marked with the @samp{E} mark. This'll probably make adaptive scoring slightly impossible, so auto-expiring and adaptive scoring doesn't really mix very well. The headers you can score on are @code{from}, @code{subject}, @code{message-id}, @code{references}, @code{xref}, @code{lines}, @code{chars} and @code{date}. In addition, you can score on @code{followup}, which will create an adaptive score entry that matches on the @code{References} header using the @code{Message-ID} of the current article, thereby matching the following thread. If you use this scheme, you should set the score file atom @code{mark} to something small---like -300, perhaps, to avoid having small random changes result in articles getting marked as read. After using adaptive scoring for a week or so, Gnus should start to become properly trained and enhance the authors you like best, and kill the authors you like least, without you having to say so explicitly. You can control what groups the adaptive scoring is to be performed on by using the score files (@pxref{Score File Format}). This will also let you use different rules in different groups. @vindex gnus-adaptive-file-suffix The adaptive score entries will be put into a file where the name is the group name with @code{gnus-adaptive-file-suffix} appended. The default is @file{ADAPT}. @vindex gnus-score-exact-adapt-limit When doing adaptive scoring, substring or fuzzy matching would probably give you the best results in most cases. However, if the header one matches is short, the possibility for false positives is great, so if the length of the match is less than @code{gnus-score-exact-adapt-limit}, exact matching will be used. If this variable is @code{nil}, exact matching will always be used to avoid this problem. @vindex gnus-default-adaptive-word-score-alist As mentioned above, you can adapt either on individual words or entire headers. If you adapt on words, the @code{gnus-default-adaptive-word-score-alist} variable says what score each instance of a word should add given a mark. @lisp (setq gnus-default-adaptive-word-score-alist ((,gnus-read-mark . 30) (,gnus-catchup-mark . -10) (,gnus-killed-mark . -20) (,gnus-del-mark . -15))) @end lisp This is the default value. If you have adaption on words enabled, every word that appears in subjects of articles marked with @code{gnus-read-mark} will result in a score rule that increase the score with 30 points. @vindex gnus-default-ignored-adaptive-words @vindex gnus-ignored-adaptive-words Words that appear in the @code{gnus-default-ignored-adaptive-words} list will be ignored. If you wish to add more words to be ignored, use the @code{gnus-ignored-adaptive-words} list instead. @vindex gnus-adaptive-word-length-limit Some may feel that short words shouldn't count when doing adaptive scoring. If so, you may set @code{gnus-adaptive-word-length-limit} to an integer. Words shorter than this number will be ignored. This variable defaults to @code{nil}. @vindex gnus-adaptive-word-syntax-table When the scoring is done, @code{gnus-adaptive-word-syntax-table} is the syntax table in effect. It is similar to the standard syntax table, but it considers numbers to be non-word-constituent characters. @vindex gnus-adaptive-word-minimum If @code{gnus-adaptive-word-minimum} is set to a number, the adaptive word scoring process will never bring down the score of an article to below this number. The default is @code{nil}. @vindex gnus-adaptive-word-no-group-words If @code{gnus-adaptive-word-no-group-words} is set to @code{t}, gnus won't adaptively word score any of the words in the group name. Useful for groups like @samp{comp.editors.emacs}, where most of the subject lines contain the word @samp{emacs}. After using this scheme for a while, it might be nice to write a @code{gnus-psychoanalyze-user} command to go through the rules and see what words you like and what words you don't like. Or perhaps not. Note that the adaptive word scoring thing is highly experimental and is likely to change in the future. Initial impressions seem to indicate that it's totally useless as it stands. Some more work (involving more rigorous statistical methods) will have to be done to make this useful. @node Home Score File @section Home Score File The score file where new score file entries will go is called the @dfn{home score file}. This is normally (and by default) the score file for the group itself. For instance, the home score file for @samp{gnu.emacs.gnus} is @file{gnu.emacs.gnus.SCORE}. However, this may not be what you want. It is often convenient to share a common home score file among many groups---all @samp{emacs} groups could perhaps use the same home score file. @vindex gnus-home-score-file The variable that controls this is @code{gnus-home-score-file}. It can be: @enumerate @item A string. Then this file will be used as the home score file for all groups. @item A function. The result of this function will be used as the home score file. The function will be called with the name of the group as the parameter. @item A list. The elements in this list can be: @enumerate @item @code{(@var{regexp} @var{file-name})}. If the @var{regexp} matches the group name, the @var{file-name} will be used as the home score file. @item A function. If the function returns non-@code{nil}, the result will be used as the home score file. The function will be called with the name of the group as the parameter. @item A string. Use the string as the home score file. @end enumerate The list will be traversed from the beginning towards the end looking for matches. @end enumerate So, if you want to use just a single score file, you could say: @lisp (setq gnus-home-score-file "my-total-score-file.SCORE") @end lisp If you want to use @file{gnu.SCORE} for all @samp{gnu} groups and @file{rec.SCORE} for all @samp{rec} groups (and so on), you can say: @findex gnus-hierarchial-home-score-file @lisp (setq gnus-home-score-file 'gnus-hierarchial-home-score-file) @end lisp This is a ready-made function provided for your convenience. Other functions include @table @code @item gnus-current-home-score-file @findex gnus-current-home-score-file Return the current'' regular score file. This will make scoring commands add entry to the innermost'' matching score file. @end table If you want to have one score file for the @samp{emacs} groups and another for the @samp{comp} groups, while letting all other groups use their own home score files: @lisp (setq gnus-home-score-file ;; @r{All groups that match the regexp @code{"\\.emacs"}} '(("\\.emacs" "emacs.SCORE") ;; @r{All the comp groups in one score file} ("^comp" "comp.SCORE"))) @end lisp @vindex gnus-home-adapt-file @code{gnus-home-adapt-file} works exactly the same way as @code{gnus-home-score-file}, but says what the home adaptive score file is instead. All new adaptive file entries will go into the file specified by this variable, and the same syntax is allowed. In addition to using @code{gnus-home-score-file} and @code{gnus-home-adapt-file}, you can also use group parameters (@pxref{Group Parameters}) and topic parameters (@pxref{Topic Parameters}) to achieve much the same. Group and topic parameters take precedence over this variable. @node Followups To Yourself @section Followups To Yourself Gnus offers two commands for picking out the @code{Message-ID} header in the current buffer. Gnus will then add a score rule that scores using this @code{Message-ID} on the @code{References} header of other articles. This will, in effect, increase the score of all articles that respond to the article in the current buffer. Quite useful if you want to easily note when people answer what you've said. @table @code @item gnus-score-followup-article @findex gnus-score-followup-article This will add a score to articles that directly follow up your own article. @item gnus-score-followup-thread @findex gnus-score-followup-thread This will add a score to all articles that appear in a thread below'' your own article. @end table @vindex message-sent-hook These two functions are both primarily meant to be used in hooks like @code{message-sent-hook}, like this: @lisp (add-hook 'message-sent-hook 'gnus-score-followup-thread) @end lisp If you look closely at your own @code{Message-ID}, you'll notice that the first two or three characters are always the same. Here's two of mine: @example <x6u3u47icf.fsf@@eyesore.no> <x6sp9o7ibw.fsf@@eyesore.no> @end example So my'' ident on this machine is @samp{x6}. This can be exploited---the following rule will raise the score on all followups to myself: @lisp ("references" ("<x6[0-9a-z]+\\.fsf\$$_-_\$$?@@.*eyesore\\.no>" 1000 nil r)) @end lisp Whether it's the first two or first three characters that are yours'' is system-dependent. @node Scoring On Other Headers @section Scoring On Other Headers @cindex scoring on other headers Gnus is quite fast when scoring the traditional'' headers---@samp{From}, @samp{Subject} and so on. However, scoring other headers requires writing a @code{head} scoring rule, which means that Gnus has to request every single article from the back end to find matches. This takes a long time in big groups. Now, there's not much you can do about this for news groups, but for mail groups, you have greater control. In @ref{To From Newsgroups}, it's explained in greater detail what this mechanism does, but here's a cookbook example for @code{nnml} on how to allow scoring on the @samp{To} and @samp{Cc} headers. Put the following in your @file{~/.gnus.el} file. @lisp (setq gnus-extra-headers '(To Cc Newsgroups Keywords) nnmail-extra-headers gnus-extra-headers) @end lisp Restart Gnus and rebuild your @code{nnml} overview files with the @kbd{M-x nnml-generate-nov-databases} command. This will take a long time if you have much mail. Now you can score on @samp{To} and @samp{Cc} as extra headers'' like so: @kbd{I e s p To RET <your name> RET}. See? Simple. @node Scoring Tips @section Scoring Tips @cindex scoring tips @table @dfn @item Crossposts @cindex crossposts @cindex scoring crossposts If you want to lower the score of crossposts, the line to match on is the @code{Xref} header. @lisp ("xref" (" talk.politics.misc:" -1000)) @end lisp @item Multiple crossposts If you want to lower the score of articles that have been crossposted to more than, say, 3 groups: @lisp ("xref" ("[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+ +[^:\n]+:[0-9]+" -1000 nil r)) @end lisp @item Matching on the body This is generally not a very good idea---it takes a very long time. Gnus actually has to fetch each individual article from the server. But you might want to anyway, I guess. Even though there are three match keys (@code{Head}, @code{Body} and @code{All}), you should choose one and stick with it in each score file. If you use any two, each article will be fetched @emph{twice}. If you want to match a bit on the @code{Head} and a bit on the @code{Body}, just use @code{All} for all the matches. @item Marking as read You will probably want to mark articles that have scores below a certain number as read. This is most easily achieved by putting the following in your @file{all.SCORE} file: @lisp ((mark -100)) @end lisp You may also consider doing something similar with @code{expunge}. @item Negated character classes If you say stuff like @code{[^abcd]*}, you may get unexpected results. That will match newlines, which might lead to, well, The Unknown. Say @code{[^abcd\n]*} instead. @end table @node Reverse Scoring @section Reverse Scoring @cindex reverse scoring If you want to keep just articles that have @samp{Sex with Emacs} in the subject header, and expunge all other articles, you could put something like this in your score file: @lisp (("subject" ("Sex with Emacs" 2)) (mark 1) (expunge 1)) @end lisp So, you raise all articles that match @samp{Sex with Emacs} and mark the rest as read, and expunge them to boot. @node Global Score Files @section Global Score Files @cindex global score files Sure, other newsreaders have global kill files''. These are usually nothing more than a single kill file that applies to all groups, stored in the user's home directory. Bah! Puny, weak newsreaders! What I'm talking about here are Global Score Files. Score files from all over the world, from users everywhere, uniting all nations in one big, happy score file union! Ange-score! New and untested! @vindex gnus-global-score-files All you have to do to use other people's score files is to set the @code{gnus-global-score-files} variable. One entry for each score file, or each score file directory. Gnus will decide by itself what score files are applicable to which group. To use the score file @file{/ftp@@ftp.gnus.org:/pub/larsi/ding/score/soc.motss.SCORE} and all score files in the @file{/ftp@@ftp.some-where:/pub/score} directory, say this: @lisp (setq gnus-global-score-files '("/ftp@@ftp.gnus.org:/pub/larsi/ding/score/soc.motss.SCORE" "/ftp@@ftp.some-where:/pub/score/")) @end lisp @findex gnus-score-search-global-directories @noindent Simple, eh? Directory names must end with a @samp{/}. These directories are typically scanned only once during each Gnus session. If you feel the need to manually re-scan the remote directories, you can use the @code{gnus-score-search-global-directories} command. Note that, at present, using this option will slow down group entry somewhat. (That is---a lot.) If you want to start maintaining score files for other people to use, just put your score file up for anonymous ftp and announce it to the world. Become a retro-moderator! Participate in the retro-moderator wars sure to ensue, where retro-moderators battle it out for the sympathy of the people, luring them to use their score files on false premises! Yay! The net is saved! Here are some tips for the would-be retro-moderator, off the top of my head: @itemize @bullet @item Articles heavily crossposted are probably junk. @item To lower a single inappropriate article, lower by @code{Message-ID}. @item Particularly brilliant authors can be raised on a permanent basis. @item Authors that repeatedly post off-charter for the group can safely be lowered out of existence. @item Set the @code{mark} and @code{expunge} atoms to obliterate the nastiest articles completely. @item Use expiring score entries to keep the size of the file down. You should probably have a long expiry period, though, as some sites keep old articles for a long time. @end itemize @dots{} I wonder whether other newsreaders will support global score files in the future. @emph{Snicker}. Yup, any day now, newsreaders like Blue Wave, xrn and 1stReader are bound to implement scoring. Should we start holding our breath yet? @node Kill Files @section Kill Files @cindex kill files Gnus still supports those pesky old kill files. In fact, the kill file entries can now be expiring, which is something I wrote before Daniel Quinlan thought of doing score files, so I've left the code in there. In short, kill processing is a lot slower (and I do mean @emph{a lot}) than score processing, so it might be a good idea to rewrite your kill files into score files. Anyway, a kill file is a normal @code{emacs-lisp} file. You can put any forms into this file, which means that you can use kill files as some sort of primitive hook function to be run on group entry, even though that isn't a very good idea. Normal kill files look like this: @lisp (gnus-kill "From" "Lars Ingebrigtsen") (gnus-kill "Subject" "ding") (gnus-expunge "X") @end lisp This will mark every article written by me as read, and remove the marked articles from the summary buffer. Very useful, you'll agree. Other programs use a totally different kill file syntax. If Gnus encounters what looks like a @code{rn} kill file, it will take a stab at interpreting it. Two summary functions for editing a @sc{gnus} kill file: @table @kbd @item M-k @kindex M-k (Summary) @findex gnus-summary-edit-local-kill Edit this group's kill file (@code{gnus-summary-edit-local-kill}). @item M-K @kindex M-K (Summary) @findex gnus-summary-edit-global-kill Edit the general kill file (@code{gnus-summary-edit-global-kill}). @end table Two group mode functions for editing the kill files: @table @kbd @item M-k @kindex M-k (Group) @findex gnus-group-edit-local-kill Edit this group's kill file (@code{gnus-group-edit-local-kill}). @item M-K @kindex M-K (Group) @findex gnus-group-edit-global-kill Edit the general kill file (@code{gnus-group-edit-global-kill}). @end table Kill file variables: @table @code @item gnus-kill-file-name @vindex gnus-kill-file-name A kill file for the group @samp{soc.motss} is normally called @file{soc.motss.KILL}. The suffix appended to the group name to get this file name is detailed by the @code{gnus-kill-file-name} variable. The global'' kill file (not in the score file sense of global'', of course) is just called @file{KILL}. @vindex gnus-kill-save-kill-file @item gnus-kill-save-kill-file If this variable is non-@code{nil}, Gnus will save the kill file after processing, which is necessary if you use expiring kills. @item gnus-apply-kill-hook @vindex gnus-apply-kill-hook @findex gnus-apply-kill-file-unless-scored @findex gnus-apply-kill-file A hook called to apply kill files to a group. It is @code{(gnus-apply-kill-file)} by default. If you want to ignore the kill file if you have a score file for the same group, you can set this hook to @code{(gnus-apply-kill-file-unless-scored)}. If you don't want kill files to be processed, you should set this variable to @code{nil}. @item gnus-kill-file-mode-hook @vindex gnus-kill-file-mode-hook A hook called in kill-file mode buffers. @end table @node Converting Kill Files @section Converting Kill Files @cindex kill files @cindex converting kill files If you have loads of old kill files, you may want to convert them into score files. If they are regular'', you can use the @file{gnus-kill-to-score.el} package; if not, you'll have to do it by hand. The kill to score conversion package isn't included in Gnus by default. You can fetch it from @uref{http://www.stud.ifi.uio.no/~larsi/ding-various/gnus-kill-to-score.el}. If your old kill files are very complex---if they contain more non-@code{gnus-kill} forms than not, you'll have to convert them by hand. Or just let them be as they are. Gnus will still use them as before. @node GroupLens @section GroupLens @cindex GroupLens @sc{Note:} Unfortunately the GroupLens system seems to have shut down, so this section is mostly of historical interest. @uref{http://www.cs.umn.edu/Research/GroupLens/, GroupLens} is a collaborative filtering system that helps you work together with other people to find the quality news articles out of the huge volume of news articles generated every day. To accomplish this the GroupLens system combines your opinions about articles you have already read with the opinions of others who have done likewise and gives you a personalized prediction for each unread news article. Think of GroupLens as a matchmaker. GroupLens watches how you rate articles, and finds other people that rate articles the same way. Once it has found some people you agree with it tells you, in the form of a prediction, what they thought of the article. You can use this prediction to help you decide whether or not you want to read the article. @menu * Using GroupLens:: How to make Gnus use GroupLens. * Rating Articles:: Letting GroupLens know how you rate articles. * Displaying Predictions:: Displaying predictions given by GroupLens. * GroupLens Variables:: Customizing GroupLens. @end menu @node Using GroupLens @subsection Using GroupLens To use GroupLens you must register a pseudonym with your local @uref{http://www.cs.umn.edu/Research/GroupLens/bbb.html, Better Bit Bureau (BBB)} is the only better bit in town at the moment. Once you have registered you'll need to set a couple of variables. @table @code @item gnus-use-grouplens @vindex gnus-use-grouplens Setting this variable to a non-@code{nil} value will make Gnus hook into all the relevant GroupLens functions. @item grouplens-pseudonym @vindex grouplens-pseudonym This variable should be set to the pseudonym you got when registering with the Better Bit Bureau. @item grouplens-newsgroups @vindex grouplens-newsgroups A list of groups that you want to get GroupLens predictions for. @end table That's the minimum of what you need to get up and running with GroupLens. Once you've registered, GroupLens will start giving you scores for articles based on the average of what other people think. But, to get the real benefit of GroupLens you need to start rating articles yourself. Then the scores GroupLens gives you will be personalized for you, based on how the people you usually agree with have already rated. @node Rating Articles @subsection Rating Articles In GroupLens, an article is rated on a scale from 1 to 5, inclusive. Where 1 means something like this article is a waste of bandwidth and 5 means that the article was really good. The basic question to ask yourself is, on a scale from 1 to 5 would I like to see more articles like this one?'' There are four ways to enter a rating for an article in GroupLens. @table @kbd @item r @kindex r (GroupLens) @findex bbb-summary-rate-article This function will prompt you for a rating on a scale of one to five. @item k @kindex k (GroupLens) @findex grouplens-score-thread This function will prompt you for a rating, and rate all the articles in the thread. This is really useful for some of those long running giant threads in rec.humor. @end table The next two commands, @kbd{n} and @kbd{,} take a numerical prefix to be the score of the article you're reading. @table @kbd @item 1-5 n @kindex n (GroupLens) @findex grouplens-next-unread-article Rate the article and go to the next unread article. @item 1-5 , @kindex , (GroupLens) @findex grouplens-best-unread-article Rate the article and go to the next unread article with the highest score. @end table If you want to give the current article a score of 4 and then go to the next article, just type @kbd{4 n}. @node Displaying Predictions @subsection Displaying Predictions GroupLens makes a prediction for you about how much you will like a news article. The predictions from GroupLens are on a scale from 1 to 5, where 1 is the worst and 5 is the best. You can use the predictions from GroupLens in one of three ways controlled by the variable @code{gnus-grouplens-override-scoring}. @vindex gnus-grouplens-override-scoring There are three ways to display predictions in grouplens. You may choose to have the GroupLens scores contribute to, or override the regular Gnus scoring mechanism. override is the default; however, some people prefer to see the Gnus scores plus the grouplens scores. To get the separate scoring behavior you need to set @code{gnus-grouplens-override-scoring} to @code{'separate}. To have the GroupLens predictions combined with the grouplens scores set it to @code{'override} and to combine the scores set @code{gnus-grouplens-override-scoring} to @code{'combine}. When you use the combine option you will also want to set the values for @code{grouplens-prediction-offset} and @code{grouplens-score-scale-factor}. @vindex grouplens-prediction-display In either case, GroupLens gives you a few choices for how you would like to see your predictions displayed. The display of predictions is controlled by the @code{grouplens-prediction-display} variable. The following are valid values for that variable. @table @code @item prediction-spot The higher the prediction, the further to the right an @samp{*} is displayed. @item confidence-interval A numeric confidence interval. @item prediction-bar The higher the prediction, the longer the bar. @item confidence-bar Numerical confidence. @item confidence-spot The spot gets bigger with more confidence. @item prediction-num Plain-old numeric value. @item confidence-plus-minus Prediction +/- confidence. @end table @node GroupLens Variables @subsection GroupLens Variables @table @code @item gnus-summary-grouplens-line-format The summary line format used in GroupLens-enhanced summary buffers. It accepts the same specs as the normal summary line format (@pxref{Summary Buffer Lines}). The default is @samp{%U%R%z%l%I%(%[%4L: %-23,23n%]%) %s\n}. @item grouplens-bbb-host Host running the bbbd server. @samp{grouplens.cs.umn.edu} is the default. @item grouplens-bbb-port Port of the host running the bbbd server. The default is 9000. @item grouplens-score-offset Offset the prediction by this value. In other words, subtract the prediction value by this number to arrive at the effective score. The default is 0. @item grouplens-score-scale-factor This variable allows the user to magnify the effect of GroupLens scores. The scale factor is applied after the offset. The default is 1. @end table @node Advanced Scoring @section Advanced Scoring Scoring on Subjects and From headers is nice enough, but what if you're really interested in what a person has to say only when she's talking about a particular subject? Or what if you really don't want to read what person A has to say when she's following up to person B, but want to read what she says when she's following up to person C? By using advanced scoring rules you may create arbitrarily complex scoring patterns. @menu * Advanced Scoring Syntax:: A definition. * Advanced Scoring Examples:: What they look like. * Advanced Scoring Tips:: Getting the most out of it. @end menu @node Advanced Scoring Syntax @subsection Advanced Scoring Syntax Ordinary scoring rules have a string as the first element in the rule. Advanced scoring rules have a list as the first element. The second element is the score to be applied if the first element evaluated to a non-@code{nil} value. These lists may consist of three logical operators, one redirection operator, and various match operators. Logical operators: @table @code @item & @itemx and This logical operator will evaluate each of its arguments until it finds one that evaluates to @code{false}, and then it'll stop. If all arguments evaluate to @code{true} values, then this operator will return @code{true}. @item | @itemx or This logical operator will evaluate each of its arguments until it finds one that evaluates to @code{true}. If no arguments are @code{true}, then this operator will return @code{false}. @item ! @itemx not @itemx ¬ This logical operator only takes a single argument. It returns the logical negation of the value of its argument. @end table There is an @dfn{indirection operator} that will make its arguments apply to the ancestors of the current article being scored. For instance, @code{1-} will make score rules apply to the parent of the current article. @code{2-} will make score rules apply to the grandparent of the current article. Alternatively, you can write @code{^^}, where the number of @code{^}s (carets) says how far back into the ancestry you want to go. Finally, we have the match operators. These are the ones that do the real work. Match operators are header name strings followed by a match and a match type. A typical match operator looks like @samp{("from" "Lars Ingebrigtsen" s)}. The header names are the same as when using simple scoring, and the match types are also the same. @node Advanced Scoring Examples @subsection Advanced Scoring Examples Please note that the following examples are score file rules. To make a complete score file from them, surround them with another pair of parentheses. Let's say you want to increase the score of articles written by Lars when he's talking about Gnus: @example @group ((& ("from" "Lars Ingebrigtsen") ("subject" "Gnus")) 1000) @end group @end example Quite simple, huh? When he writes long articles, he sometimes has something nice to say: @example ((& ("from" "Lars Ingebrigtsen") (| ("subject" "Gnus") ("lines" 100 >))) 1000) @end example However, when he responds to things written by Reig Eigil Logge, you really don't want to read what he's written: @example ((& ("from" "Lars Ingebrigtsen") (1- ("from" "Reig Eigil Logge"))) -100000) @end example Everybody that follows up Redmondo when he writes about disappearing socks should have their scores raised, but only when they talk about white socks. However, when Lars talks about socks, it's usually not very interesting: @example ((& (1- (& ("from" "redmondo@@.*no" r) ("body" "disappearing.*socks" t))) (! ("from" "Lars Ingebrigtsen")) ("body" "white.*socks")) 1000) @end example Suppose you're reading a high volume group and you're only interested in replies. The plan is to score down all articles that don't have subject that begin with "Re:", "Fw:" or "Fwd:" and then score up all parents of articles that have subjects that begin with reply marks. @example ((! ("subject" "re:\\|fwd?:" r)) -200) ((1- ("subject" "re:\\|fwd?:" r)) 200) @end example The possibilities are endless. @node Advanced Scoring Tips @subsection Advanced Scoring Tips The @code{&} and @code{|} logical operators do short-circuit logic. That is, they stop processing their arguments when it's clear what the result of the operation will be. For instance, if one of the arguments of an @code{&} evaluates to @code{false}, there's no point in evaluating the rest of the arguments. This means that you should put slow matches (@samp{body}, @samp{header}) last and quick matches (@samp{from}, @samp{subject}) first. The indirection arguments (@code{1-} and so on) will make their arguments work on previous generations of the thread. If you say something like: @example ... (1- (1- ("from" "lars"))) ... @end example Then that means score on the from header of the grandparent of the current article''. An indirection is quite fast, but it's better to say: @example (1- (& ("from" "Lars") ("subject" "Gnus"))) @end example than it is to say: @example (& (1- ("from" "Lars")) (1- ("subject" "Gnus"))) @end example @node Score Decays @section Score Decays @cindex score decays @cindex decays You may find that your scores have a tendency to grow without bounds, especially if you're using adaptive scoring. If scores get too big, they lose all meaning---they simply max out and it's difficult to use them in any sensible way. @vindex gnus-decay-scores @findex gnus-decay-score @vindex gnus-decay-score-function Gnus provides a mechanism for decaying scores to help with this problem. When score files are loaded and @code{gnus-decay-scores} is non-@code{nil}, Gnus will run the score files through the decaying mechanism thereby lowering the scores of all non-permanent score rules. The decay itself if performed by the @code{gnus-decay-score-function} function, which is @code{gnus-decay-score} by default. Here's the definition of that function: @lisp (defun gnus-decay-score (score) "Decay SCORE according to gnus-score-decay-constant' and gnus-score-decay-scale'." (let ((n (- score (* (if (< score 0) -1 1) (min (abs score) (max gnus-score-decay-constant (* (abs score) gnus-score-decay-scale))))))) (if (and (featurep 'xemacs) ;; XEmacs' floor can handle only the floating point ;; number below the half of the maximum integer. (> (abs n) (lsh -1 -2))) (string-to-number (car (split-string (number-to-string n) "\\."))) (floor n)))) @end lisp @vindex gnus-score-decay-scale @vindex gnus-score-decay-constant @code{gnus-score-decay-constant} is 3 by default and @code{gnus-score-decay-scale} is 0.05. This should cause the following: @enumerate @item Scores between -3 and 3 will be set to 0 when this function is called. @item Scores with magnitudes between 3 and 60 will be shrunk by 3. @item Scores with magnitudes greater than 60 will be shrunk by 5% of the score. @end enumerate If you don't like this decay function, write your own. It is called with the score to be decayed as its only parameter, and it should return the new score, which should be an integer. Gnus will try to decay scores once a day. If you haven't run Gnus for four days, Gnus will decay the scores four times, for instance. @iftex @iflatex @chapter Message @include message.texi @chapter Emacs MIME @include emacs-mime.texi @chapter Sieve @include sieve.texi @chapter PGG @include pgg.texi @end iflatex @end iftex @node Various @chapter Various @menu * Process/Prefix:: A convention used by many treatment commands. * Interactive:: Making Gnus ask you many questions. * Symbolic Prefixes:: How to supply some Gnus functions with options. * Formatting Variables:: You can specify what buffers should look like. * Window Layout:: Configuring the Gnus buffer windows. * Faces and Fonts:: How to change how faces look. * Compilation:: How to speed Gnus up. * Mode Lines:: Displaying information in the mode lines. * Highlighting and Menus:: Making buffers look all nice and cozy. * Buttons:: Get tendinitis in ten easy steps! * Daemons:: Gnus can do things behind your back. * NoCeM:: How to avoid spam and other fatty foods. * Undo:: Some actions can be undone. * Predicate Specifiers:: Specifying predicates. * Moderation:: What to do if you're a moderator. * Fetching a Group:: Starting Gnus just to read a group. * Image Enhancements:: Modern versions of Emacs/XEmacs can display images. * Fuzzy Matching:: What's the big fuzz? * Thwarting Email Spam:: Simple ways to avoid unsolicited commercial email. * Spam Package:: A package for filtering and processing spam. * Other modes:: Interaction with other modes. * Various Various:: Things that are really various. @end menu @node Process/Prefix @section Process/Prefix @cindex process/prefix convention Many functions, among them functions for moving, decoding and saving articles, use what is known as the @dfn{Process/Prefix convention}. This is a method for figuring out what articles the user wants the command to be performed on. It goes like this: If the numeric prefix is N, perform the operation on the next N articles, starting with the current one. If the numeric prefix is negative, perform the operation on the previous N articles, starting with the current one. @vindex transient-mark-mode If @code{transient-mark-mode} in non-@code{nil} and the region is active, all articles in the region will be worked upon. If there is no numeric prefix, but some articles are marked with the process mark, perform the operation on the articles marked with the process mark. If there is neither a numeric prefix nor any articles marked with the process mark, just perform the operation on the current article. Quite simple, really, but it needs to be made clear so that surprises are avoided. Commands that react to the process mark will push the current list of process marked articles onto a stack and will then clear all process marked articles. You can restore the previous configuration with the @kbd{M P y} command (@pxref{Setting Process Marks}). @vindex gnus-summary-goto-unread One thing that seems to shock & horrify lots of people is that, for instance, @kbd{3 d} does exactly the same as @kbd{d} @kbd{d} @kbd{d}. Since each @kbd{d} (which marks the current article as read) by default goes to the next unread article after marking, this means that @kbd{3 d} will mark the next three unread articles as read, no matter what the summary buffer looks like. Set @code{gnus-summary-goto-unread} to @code{nil} for a more straightforward action. Many commands do not use the process/prefix convention. All commands that do explicitly say so in this manual. To apply the process/prefix convention to commands that do not use it, you can use the @kbd{M-&} command. For instance, to mark all the articles in the group as expirable, you could say @kbd{M P b M-& E}. @node Interactive @section Interactive @cindex interaction @table @code @item gnus-novice-user @vindex gnus-novice-user If this variable is non-@code{nil}, you are either a newcomer to the World of Usenet, or you are very cautious, which is a nice thing to be, really. You will be given questions of the type Are you sure you want to do this?'' before doing anything dangerous. This is @code{t} by default. @item gnus-expert-user @vindex gnus-expert-user If this variable is non-@code{nil}, you will seldom be asked any questions by Gnus. It will simply assume you know what you're doing, no matter how strange. @item gnus-interactive-catchup @vindex gnus-interactive-catchup Require confirmation before catching up a group if non-@code{nil}. It is @code{t} by default. @item gnus-interactive-exit @vindex gnus-interactive-exit Require confirmation before exiting Gnus. This variable is @code{t} by default. @end table @node Symbolic Prefixes @section Symbolic Prefixes @cindex symbolic prefixes Quite a lot of Emacs commands react to the (numeric) prefix. For instance, @kbd{C-u 4 C-f} moves point four characters forward, and @kbd{C-u 9 0 0 I s s p} adds a permanent @code{Subject} substring score rule of 900 to the current article. This is all nice and well, but what if you want to give a command some additional information? Well, what most commands do is interpret the raw'' prefix in some special way. @kbd{C-u 0 C-x C-s} means that one doesn't want a backup file to be created when saving the current buffer, for instance. But what if you want to save without making a backup file, and you want Emacs to flash lights and play a nice tune at the same time? You can't, and you're probably perfectly happy that way. @kindex M-i (Summary) @findex gnus-symbolic-argument I'm not, so I've added a second prefix---the @dfn{symbolic prefix}. The prefix key is @kbd{M-i} (@code{gnus-symbolic-argument}), and the next character typed in is the value. You can stack as many @kbd{M-i} prefixes as you want. @kbd{M-i a C-M-u} means feed the @kbd{C-M-u} command the symbolic prefix @code{a}''. @kbd{M-i a M-i b C-M-u} means feed the @kbd{C-M-u} command the symbolic prefixes @code{a} and @code{b}''. You get the drift. Typing in symbolic prefixes to commands that don't accept them doesn't hurt, but it doesn't do any good either. Currently not many Gnus functions make use of the symbolic prefix. If you're interested in how Gnus implements this, @pxref{Extended Interactive}. @node Formatting Variables @section Formatting Variables @cindex formatting variables Throughout this manual you've probably noticed lots of variables called things like @code{gnus-group-line-format} and @code{gnus-summary-mode-line-format}. These control how Gnus is to output lines in the various buffers. There's quite a lot of them. Fortunately, they all use the same syntax, so there's not that much to be annoyed by. Here's an example format spec (from the group buffer): @samp{%M%S%5y: %(%g%)\n}. We see that it is indeed extremely ugly, and that there are lots of percentages everywhere. @menu * Formatting Basics:: A formatting variable is basically a format string. * Mode Line Formatting:: Some rules about mode line formatting variables. * Advanced Formatting:: Modifying output in various ways. * User-Defined Specs:: Having Gnus call your own functions. * Formatting Fonts:: Making the formatting look colorful and nice. * Positioning Point:: Moving point to a position after an operation. * Tabulation:: Tabulating your output. * Wide Characters:: Dealing with wide characters. @end menu Currently Gnus uses the following formatting variables: @code{gnus-group-line-format}, @code{gnus-summary-line-format}, @code{gnus-server-line-format}, @code{gnus-topic-line-format}, @code{gnus-group-mode-line-format}, @code{gnus-summary-mode-line-format}, @code{gnus-article-mode-line-format}, @code{gnus-server-mode-line-format}, and @code{gnus-summary-pick-line-format}. All these format variables can also be arbitrary elisp forms. In that case, they will be @code{eval}ed to insert the required lines. @kindex M-x gnus-update-format @findex gnus-update-format Gnus includes a command to help you while creating your own format specs. @kbd{M-x gnus-update-format} will @code{eval} the current form, update the spec in question and pop you to a buffer where you can examine the resulting Lisp code to be run to generate the line. @node Formatting Basics @subsection Formatting Basics Each @samp{%} element will be replaced by some string or other when the buffer in question is generated. @samp{%5y} means insert the @samp{y} spec, and pad with spaces to get a 5-character field''. As with normal C and Emacs Lisp formatting strings, the numerical modifier between the @samp{%} and the formatting type character will @dfn{pad} the output so that it is always at least that long. @samp{%5y} will make the field always (at least) five characters wide by padding with spaces to the left. If you say @samp{%-5y}, it will pad to the right instead. You may also wish to limit the length of the field to protect against particularly wide values. For that you can say @samp{%4,6y}, which means that the field will never be more than 6 characters wide and never less than 4 characters wide. Also Gnus supports some extended format specifications, such as @samp{%&user-date;}. @node Mode Line Formatting @subsection Mode Line Formatting Mode line formatting variables (e.g., @code{gnus-summary-mode-line-format}) follow the same rules as other, buffer line oriented formatting variables (@pxref{Formatting Basics}) with the following two differences: @enumerate @item There must be no newline (@samp{\n}) at the end. @item The special @samp{%%b} spec can be used to display the buffer name. Well, it's no spec at all, really---@samp{%%} is just a way to quote @samp{%} to allow it to pass through the formatting machinery unmangled, so that Emacs receives @samp{%b}, which is something the Emacs mode line display interprets to mean show the buffer name''. For a full list of mode line specs Emacs understands, see the documentation of the @code{mode-line-format} variable. @end enumerate @node Advanced Formatting @subsection Advanced Formatting It is frequently useful to post-process the fields in some way. Padding, limiting, cutting off parts and suppressing certain values can be achieved by using @dfn{tilde modifiers}. A typical tilde spec might look like @samp{%~(cut 3)~(ignore "0")y}. These are the valid modifiers: @table @code @item pad @itemx pad-left Pad the field to the left with spaces until it reaches the required length. @item pad-right Pad the field to the right with spaces until it reaches the required length. @item max @itemx max-left Cut off characters from the left until it reaches the specified length. @item max-right Cut off characters from the right until it reaches the specified length. @item cut @itemx cut-left Cut off the specified number of characters from the left. @item cut-right Cut off the specified number of characters from the right. @item ignore Return an empty string if the field is equal to the specified value. @item form Use the specified form as the field value when the @samp{@@} spec is used. Here's an example: @lisp "~(form (current-time-string))@@" @end lisp @end table Let's take an example. The @samp{%o} spec in the summary mode lines will return a date in compact ISO8601 format---@samp{19960809T230410}. This is quite a mouthful, so we want to shave off the century number and the time, leaving us with a six-character date. That would be @samp{%~(cut-left 2)~(max-right 6)~(pad 6)o}. (Cutting is done before maxing, and we need the padding to ensure that the date is never less than 6 characters to make it look nice in columns.) Ignoring is done first; then cutting; then maxing; and then as the very last operation, padding. If you use lots of these advanced thingies, you'll find that Gnus gets quite slow. This can be helped enormously by running @kbd{M-x gnus-compile} when you are satisfied with the look of your lines. @xref{Compilation}. @node User-Defined Specs @subsection User-Defined Specs All the specs allow for inserting user defined specifiers---@samp{u}. The next character in the format string should be a letter. Gnus will call the function @code{gnus-user-format-function-}@samp{X}, where @samp{X} is the letter following @samp{%u}. The function will be passed a single parameter---what the parameter means depends on what buffer it's being called from. The function should return a string, which will be inserted into the buffer just like information from any other specifier. This function may also be called with dummy values, so it should protect against that. Also Gnus supports extended user-defined specs, such as @samp{%u&foo;}. Gnus will call the function @code{gnus-user-format-function-}@samp{foo}. You can also use tilde modifiers (@pxref{Advanced Formatting} to achieve much the same without defining new functions. Here's an example: @samp{%~(form (count-lines (point-min) (point)))@@}. The form given here will be evaluated to yield the current line number, and then inserted. @node Formatting Fonts @subsection Formatting Fonts There are specs for highlighting, and these are shared by all the format variables. Text inside the @samp{%(} and @samp{%)} specifiers will get the special @code{mouse-face} property set, which means that it will be highlighted (with @code{gnus-mouse-face}) when you put the mouse pointer over it. Text inside the @samp{%@{} and @samp{%@}} specifiers will have their normal faces set using @code{gnus-face-0}, which is @code{bold} by default. If you say @samp{%1@{}, you'll get @code{gnus-face-1} instead, and so on. Create as many faces as you wish. The same goes for the @code{mouse-face} specs---you can say @samp{%3(hello%)} to have @samp{hello} mouse-highlighted with @code{gnus-mouse-face-3}. Text inside the @samp{%<<} and @samp{%>>} specifiers will get the special @code{balloon-help} property set to @code{gnus-balloon-face-0}. If you say @samp{%1<<}, you'll get @code{gnus-balloon-face-1} and so on. The @code{gnus-balloon-face-*} variables should be either strings or symbols naming functions that return a string. When the mouse passes over text with this property set, a balloon window will appear and display the string. Please refer to @ref{Tooltips, ,Tooltips, emacs, The Emacs Manual}, (in GNU Emacs) or the doc string of @code{balloon-help-mode} (in XEmacs) for more information on this. (For technical reasons, the guillemets have been approximated as @samp{<<} and @samp{>>} in this paragraph.) Here's an alternative recipe for the group buffer: @lisp ;; @r{Create three face types.} (setq gnus-face-1 'bold) (setq gnus-face-3 'italic) ;; @r{We want the article count to be in} ;; @r{a bold and green face. So we create} ;; @r{a new face called @code{my-green-bold}.} (copy-face 'bold 'my-green-bold) ;; @r{Set the color.} (set-face-foreground 'my-green-bold "ForestGreen") (setq gnus-face-2 'my-green-bold) ;; @r{Set the new & fancy format.} (setq gnus-group-line-format "%M%S%3@{%5y%@}%2[:%] %(%1@{%g%@}%)\n") @end lisp I'm sure you'll be able to use this scheme to create totally unreadable and extremely vulgar displays. Have fun! Note that the @samp{%(} specs (and friends) do not make any sense on the mode-line variables. @node Positioning Point @subsection Positioning Point Gnus usually moves point to a pre-defined place on each line in most buffers. By default, point move to the first colon character on the line. You can customize this behavior in three different ways. You can move the colon character to somewhere else on the line. @findex gnus-goto-colon You can redefine the function that moves the point to the colon. The function is called @code{gnus-goto-colon}. But perhaps the most convenient way to deal with this, if you don't want to have a colon in your line, is to use the @samp{%*} specifier. If you put a @samp{%*} somewhere in your format line definition, Gnus will place point there. @node Tabulation @subsection Tabulation You can usually line up your displays by padding and cutting your strings. However, when combining various strings of different size, it can often be more convenient to just output the strings, and then worry about lining up the following text afterwards. To do that, Gnus supplies tabulator specs---@samp{%=}. There are two different types---@dfn{hard tabulators} and @dfn{soft tabulators}. @samp{%50=} will insert space characters to pad the line up to column 50. If the text is already past column 50, nothing will be inserted. This is the soft tabulator. @samp{%-50=} will insert space characters to pad the line up to column 50. If the text is already past column 50, the excess text past column 50 will be removed. This is the hard tabulator. @node Wide Characters @subsection Wide Characters Fixed width fonts in most countries have characters of the same width. Some countries, however, use Latin characters mixed with wider characters---most notable East Asian countries. The problem is that when formatting, Gnus assumes that if a string is 10 characters wide, it'll be 10 Latin characters wide on the screen. In these countries, that's not true. @vindex gnus-use-correct-string-widths To help fix this, you can set @code{gnus-use-correct-string-widths} to @code{t}. This makes buffer generation slower, but the results will be prettier. The default value under XEmacs is @code{t} but @code{nil} for Emacs. @node Window Layout @section Window Layout @cindex window layout No, there's nothing here about X, so be quiet. @vindex gnus-use-full-window If @code{gnus-use-full-window} non-@code{nil}, Gnus will delete all other windows and occupy the entire Emacs screen by itself. It is @code{t} by default. Setting this variable to @code{nil} kinda works, but there are glitches. Use at your own peril. @vindex gnus-buffer-configuration @code{gnus-buffer-configuration} describes how much space each Gnus buffer should be given. Here's an excerpt of this variable: @lisp ((group (vertical 1.0 (group 1.0 point) (if gnus-carpal (group-carpal 4)))) (article (vertical 1.0 (summary 0.25 point) (article 1.0)))) @end lisp This is an alist. The @dfn{key} is a symbol that names some action or other. For instance, when displaying the group buffer, the window configuration function will use @code{group} as the key. A full list of possible names is listed below. The @dfn{value} (i.e., the @dfn{split}) says how much space each buffer should occupy. To take the @code{article} split as an example - @lisp (article (vertical 1.0 (summary 0.25 point) (article 1.0))) @end lisp This @dfn{split} says that the summary buffer should occupy 25% of upper half of the screen, and that it is placed over the article buffer. As you may have noticed, 100% + 25% is actually 125% (yup, I saw y'all reaching for that calculator there). However, the special number @code{1.0} is used to signal that this buffer should soak up all the rest of the space available after the rest of the buffers have taken whatever they need. There should be only one buffer with the @code{1.0} size spec per split. Point will be put in the buffer that has the optional third element @code{point}. In a @code{frame} split, the last subsplit having a leaf split where the tag @code{frame-focus} is a member (i.e. is the third or fourth element in the list, depending on whether the @code{point} tag is present) gets focus. Here's a more complicated example: @lisp (article (vertical 1.0 (group 4) (summary 0.25 point) (if gnus-carpal (summary-carpal 4)) (article 1.0))) @end lisp If the size spec is an integer instead of a floating point number, then that number will be used to say how many lines a buffer should occupy, not a percentage. If the @dfn{split} looks like something that can be @code{eval}ed (to be precise---if the @code{car} of the split is a function or a subr), this split will be @code{eval}ed. If the result is non-@code{nil}, it will be used as a split. This means that there will be three buffers if @code{gnus-carpal} is @code{nil}, and four buffers if @code{gnus-carpal} is non-@code{nil}. Not complicated enough for you? Well, try this on for size: @lisp (article (horizontal 1.0 (vertical 0.5 (group 1.0) (gnus-carpal 4)) (vertical 1.0 (summary 0.25 point) (summary-carpal 4) (article 1.0)))) @end lisp Whoops. Two buffers with the mystery 100% tag. And what's that @code{horizontal} thingie? If the first element in one of the split is @code{horizontal}, Gnus will split the window horizontally, giving you two windows side-by-side. Inside each of these strips you may carry on all you like in the normal fashion. The number following @code{horizontal} says what percentage of the screen is to be given to this strip. For each split, there @emph{must} be one element that has the 100% tag. The splitting is never accurate, and this buffer will eat any leftover lines from the splits. To be slightly more formal, here's a definition of what a valid split may look like: @example @group split = frame | horizontal | vertical | buffer | form frame = "(frame " size *split ")" horizontal = "(horizontal " size *split ")" vertical = "(vertical " size *split ")" buffer = "(" buf-name " " size *[ "point" ] *[ "frame-focus"] ")" size = number | frame-params buf-name = group | article | summary ... @end group @end example The limitations are that the @code{frame} split can only appear as the top-level split. @var{form} should be an Emacs Lisp form that should return a valid split. We see that each split is fully recursive, and may contain any number of @code{vertical} and @code{horizontal} splits. @vindex gnus-window-min-width @vindex gnus-window-min-height @cindex window height @cindex window width Finding the right sizes can be a bit complicated. No window may be less than @code{gnus-window-min-height} (default 1) characters high, and all windows must be at least @code{gnus-window-min-width} (default 1) characters wide. Gnus will try to enforce this before applying the splits. If you want to use the normal Emacs window width/height limit, you can just set these two variables to @code{nil}. If you're not familiar with Emacs terminology, @code{horizontal} and @code{vertical} splits may work the opposite way of what you'd expect. Windows inside a @code{horizontal} split are shown side-by-side, and windows within a @code{vertical} split are shown above each other. @findex gnus-configure-frame If you want to experiment with window placement, a good tip is to call @code{gnus-configure-frame} directly with a split. This is the function that does all the real work when splitting buffers. Below is a pretty nonsensical configuration with 5 windows; two for the group buffer and three for the article buffer. (I said it was nonsensical.) If you @code{eval} the statement below, you can get an idea of how that would look straight away, without going through the normal Gnus channels. Play with it until you're satisfied, and then use @code{gnus-add-configuration} to add your new creation to the buffer configuration list. @lisp (gnus-configure-frame '(horizontal 1.0 (vertical 10 (group 1.0) (article 0.3 point)) (vertical 1.0 (article 1.0) (horizontal 4 (group 1.0) (article 10))))) @end lisp You might want to have several frames as well. No prob---just use the @code{frame} split: @lisp (gnus-configure-frame '(frame 1.0 (vertical 1.0 (summary 0.25 point frame-focus) (article 1.0)) (vertical ((height . 5) (width . 15) (user-position . t) (left . -1) (top . 1)) (picon 1.0)))) @end lisp This split will result in the familiar summary/article window configuration in the first (or main'') frame, while a small additional frame will be created where picons will be shown. As you can see, instead of the normal @code{1.0} top-level spec, each additional split should have a frame parameter alist as the size spec. @xref{Frame Parameters, , Frame Parameters, elisp, The GNU Emacs Lisp Reference Manual}. Under XEmacs, a frame property list will be accepted, too---for instance, @code{(height 5 width 15 left -1 top 1)} is such a plist. The list of all possible keys for @code{gnus-buffer-configuration} can be found in its default value. Note that the @code{message} key is used for both @code{gnus-group-mail} and @code{gnus-summary-mail-other-window}. If it is desirable to distinguish between the two, something like this might be used: @lisp (message (horizontal 1.0 (vertical 1.0 (message 1.0 point)) (vertical 0.24 (if (buffer-live-p gnus-summary-buffer) '(summary 0.5)) (group 1.0)))) @end lisp One common desire for a multiple frame split is to have a separate frame for composing mail and news while leaving the original frame intact. To accomplish that, something like the following can be done: @lisp (message (frame 1.0 (if (not (buffer-live-p gnus-summary-buffer)) (car (cdr (assoc 'group gnus-buffer-configuration))) (car (cdr (assoc 'summary gnus-buffer-configuration)))) (vertical ((user-position . t) (top . 1) (left . 1) (name . "Message")) (message 1.0 point)))) @end lisp @findex gnus-add-configuration Since the @code{gnus-buffer-configuration} variable is so long and complicated, there's a function you can use to ease changing the config of a single setting: @code{gnus-add-configuration}. If, for instance, you want to change the @code{article} setting, you could say: @lisp (gnus-add-configuration '(article (vertical 1.0 (group 4) (summary .25 point) (article 1.0)))) @end lisp You'd typically stick these @code{gnus-add-configuration} calls in your @file{~/.gnus.el} file or in some startup hook---they should be run after Gnus has been loaded. @vindex gnus-always-force-window-configuration If all windows mentioned in the configuration are already visible, Gnus won't change the window configuration. If you always want to force the right'' window configuration, you can set @code{gnus-always-force-window-configuration} to non-@code{nil}. If you're using tree displays (@pxref{Tree Display}), and the tree window is displayed vertically next to another window, you may also want to fiddle with @code{gnus-tree-minimize-window} to avoid having the windows resized. @subsection Example Window Configurations @itemize @bullet @item Narrow left hand side occupied by group buffer. Right hand side split between summary buffer (top one-sixth) and article buffer (bottom). @ifinfo @example +---+---------+ | G | Summary | | r +---------+ | o | | | u | Article | | p | | +---+---------+ @end example @end ifinfo @lisp (gnus-add-configuration '(article (horizontal 1.0 (vertical 25 (group 1.0)) (vertical 1.0 (summary 0.16 point) (article 1.0))))) (gnus-add-configuration '(summary (horizontal 1.0 (vertical 25 (group 1.0)) (vertical 1.0 (summary 1.0 point))))) @end lisp @end itemize @node Faces and Fonts @section Faces and Fonts @cindex faces @cindex fonts @cindex colors Fiddling with fonts and faces used to be very difficult, but these days it is very simple. You simply say @kbd{M-x customize-face}, pick out the face you want to alter, and alter it via the standard Customize interface. @node Compilation @section Compilation @cindex compilation @cindex byte-compilation @findex gnus-compile Remember all those line format specification variables? @code{gnus-summary-line-format}, @code{gnus-group-line-format}, and so on. Now, Gnus will of course heed whatever these variables are, but, unfortunately, changing them will mean a quite significant slow-down. (The default values of these variables have byte-compiled functions associated with them, while the user-generated versions do not, of course.) To help with this, you can run @kbd{M-x gnus-compile} after you've fiddled around with the variables and feel that you're (kind of) satisfied. This will result in the new specs being byte-compiled, and you'll get top speed again. Gnus will save these compiled specs in the @file{.newsrc.eld} file. (User-defined functions aren't compiled by this function, though---you should compile them yourself by sticking them into the @file{~/.gnus.el} file and byte-compiling that file.) @node Mode Lines @section Mode Lines @cindex mode lines @vindex gnus-updated-mode-lines @code{gnus-updated-mode-lines} says what buffers should keep their mode lines updated. It is a list of symbols. Supported symbols include @code{group}, @code{article}, @code{summary}, @code{server}, @code{browse}, and @code{tree}. If the corresponding symbol is present, Gnus will keep that mode line updated with information that may be pertinent. If this variable is @code{nil}, screen refresh may be quicker. @cindex display-time @vindex gnus-mode-non-string-length By default, Gnus displays information on the current article in the mode lines of the summary and article buffers. The information Gnus wishes to display (e.g. the subject of the article) is often longer than the mode lines, and therefore have to be cut off at some point. The @code{gnus-mode-non-string-length} variable says how long the other elements on the line is (i.e., the non-info part). If you put additional elements on the mode line (e.g. a clock), you should modify this variable: @c Hook written by Francesco Potorti <pot@cnuce.cnr.it> @lisp (add-hook 'display-time-hook (lambda () (setq gnus-mode-non-string-length (+ 21 (if line-number-mode 5 0) (if column-number-mode 4 0) (length display-time-string))))) @end lisp If this variable is @code{nil} (which is the default), the mode line strings won't be chopped off, and they won't be padded either. Note that the default is unlikely to be desirable, as even the percentage complete in the buffer may be crowded off the mode line; the user should configure this variable appropriately for her configuration. @node Highlighting and Menus @section Highlighting and Menus @cindex visual @cindex highlighting @cindex menus @vindex gnus-visual The @code{gnus-visual} variable controls most of the Gnus-prettifying aspects. If @code{nil}, Gnus won't attempt to create menus or use fancy colors or fonts. This will also inhibit loading the @file{gnus-vis.el} file. This variable can be a list of visual properties that are enabled. The following elements are valid, and are all included by default: @table @code @item group-highlight Do highlights in the group buffer. @item summary-highlight Do highlights in the summary buffer. @item article-highlight Do highlights in the article buffer. @item highlight Turn on highlighting in all buffers. @item group-menu Create menus in the group buffer. @item summary-menu Create menus in the summary buffers. @item article-menu Create menus in the article buffer. @item browse-menu Create menus in the browse buffer. @item server-menu Create menus in the server buffer. @item score-menu Create menus in the score buffers. @item menu Create menus in all buffers. @end table So if you only want highlighting in the article buffer and menus in all buffers, you could say something like: @lisp (setq gnus-visual '(article-highlight menu)) @end lisp If you want highlighting only and no menus whatsoever, you'd say: @lisp (setq gnus-visual '(highlight)) @end lisp If @code{gnus-visual} is @code{t}, highlighting and menus will be used in all Gnus buffers. Other general variables that influence the look of all buffers include: @table @code @item gnus-mouse-face @vindex gnus-mouse-face This is the face (i.e., font) used for mouse highlighting in Gnus. No mouse highlights will be done if @code{gnus-visual} is @code{nil}. @end table There are hooks associated with the creation of all the different menus: @table @code @item gnus-article-menu-hook @vindex gnus-article-menu-hook Hook called after creating the article mode menu. @item gnus-group-menu-hook @vindex gnus-group-menu-hook Hook called after creating the group mode menu. @item gnus-summary-menu-hook @vindex gnus-summary-menu-hook Hook called after creating the summary mode menu. @item gnus-server-menu-hook @vindex gnus-server-menu-hook Hook called after creating the server mode menu. @item gnus-browse-menu-hook @vindex gnus-browse-menu-hook Hook called after creating the browse mode menu. @item gnus-score-menu-hook @vindex gnus-score-menu-hook Hook called after creating the score mode menu. @end table @node Buttons @section Buttons @cindex buttons @cindex mouse @cindex click Those new-fangled @dfn{mouse} contraptions is very popular with the young, hep kids who don't want to learn the proper way to do things these days. Why, I remember way back in the summer of '89, when I was using Emacs on a Tops 20 system. Three hundred users on one single machine, and every user was running Simula compilers. Bah! Right. @vindex gnus-carpal Well, you can make Gnus display bufferfuls of buttons you can click to do anything by setting @code{gnus-carpal} to @code{t}. Pretty simple, really. Tell the chiropractor I sent you. @table @code @item gnus-carpal-mode-hook @vindex gnus-carpal-mode-hook Hook run in all carpal mode buffers. @item gnus-carpal-button-face @vindex gnus-carpal-button-face Face used on buttons. @item gnus-carpal-header-face @vindex gnus-carpal-header-face Face used on carpal buffer headers. @item gnus-carpal-group-buffer-buttons @vindex gnus-carpal-group-buffer-buttons Buttons in the group buffer. @item gnus-carpal-summary-buffer-buttons @vindex gnus-carpal-summary-buffer-buttons Buttons in the summary buffer. @item gnus-carpal-server-buffer-buttons @vindex gnus-carpal-server-buffer-buttons Buttons in the server buffer. @item gnus-carpal-browse-buffer-buttons @vindex gnus-carpal-browse-buffer-buttons Buttons in the browse buffer. @end table All the @code{buttons} variables are lists. The elements in these list are either cons cells where the @code{car} contains a text to be displayed and the @code{cdr} contains a function symbol, or a simple string. @node Daemons @section Daemons @cindex demons @cindex daemons Gnus, being larger than any program ever written (allegedly), does lots of strange stuff that you may wish to have done while you're not present. For instance, you may want it to check for new mail once in a while. Or you may want it to close down all connections to all servers when you leave Emacs idle. And stuff like that. Gnus will let you do stuff like that by defining various @dfn{handlers}. Each handler consists of three elements: A @var{function}, a @var{time}, and an @var{idle} parameter. Here's an example of a handler that closes connections when Emacs has been idle for thirty minutes: @lisp (gnus-demon-close-connections nil 30) @end lisp Here's a handler that scans for @acronym{PGP} headers every hour when Emacs is idle: @lisp (gnus-demon-scan-pgp 60 t) @end lisp This @var{time} parameter and that @var{idle} parameter work together in a strange, but wonderful fashion. Basically, if @var{idle} is @code{nil}, then the function will be called every @var{time} minutes. If @var{idle} is @code{t}, then the function will be called after @var{time} minutes only if Emacs is idle. So if Emacs is never idle, the function will never be called. But once Emacs goes idle, the function will be called every @var{time} minutes. If @var{idle} is a number and @var{time} is a number, the function will be called every @var{time} minutes only when Emacs has been idle for @var{idle} minutes. If @var{idle} is a number and @var{time} is @code{nil}, the function will be called once every time Emacs has been idle for @var{idle} minutes. And if @var{time} is a string, it should look like @samp{07:31}, and the function will then be called once every day somewhere near that time. Modified by the @var{idle} parameter, of course. @vindex gnus-demon-timestep (When I say minute'' here, I really mean @code{gnus-demon-timestep} seconds. This is 60 by default. If you change that variable, all the timings in the handlers will be affected.) So, if you want to add a handler, you could put something like this in your @file{~/.gnus.el} file: @findex gnus-demon-add-handler @lisp (gnus-demon-add-handler 'gnus-demon-close-connections 30 t) @end lisp @findex gnus-demon-add-nocem @findex gnus-demon-add-scanmail @findex gnus-demon-add-rescan @findex gnus-demon-add-scan-timestamps @findex gnus-demon-add-disconnection Some ready-made functions to do this have been created: @code{gnus-demon-add-nocem}, @code{gnus-demon-add-disconnection}, @code{gnus-demon-add-nntp-close-connection}, @code{gnus-demon-add-scan-timestamps}, @code{gnus-demon-add-rescan}, and @code{gnus-demon-add-scanmail}. Just put those functions in your @file{~/.gnus.el} if you want those abilities. @findex gnus-demon-init @findex gnus-demon-cancel @vindex gnus-demon-handlers If you add handlers to @code{gnus-demon-handlers} directly, you should run @code{gnus-demon-init} to make the changes take hold. To cancel all daemons, you can use the @code{gnus-demon-cancel} function. Note that adding daemons can be pretty naughty if you over do it. Adding functions that scan all news and mail from all servers every two seconds is a sure-fire way of getting booted off any respectable system. So behave. @node NoCeM @section NoCeM @cindex nocem @cindex spam @dfn{Spamming} is posting the same article lots and lots of times. Spamming is bad. Spamming is evil. Spamming is usually canceled within a day or so by various anti-spamming agencies. These agencies usually also send out @dfn{NoCeM} messages. NoCeM is pronounced no see-'em'', and means what the name implies---these are messages that make the offending articles, like, go away. What use are these NoCeM messages if the articles are canceled anyway? Some sites do not honor cancel messages and some sites just honor cancels from a select few people. Then you may wish to make use of the NoCeM messages, which are distributed in the @samp{alt.nocem.misc} newsgroup. Gnus can read and parse the messages in this group automatically, and this will make spam disappear. There are some variables to customize, of course: @table @code @item gnus-use-nocem @vindex gnus-use-nocem Set this variable to @code{t} to set the ball rolling. It is @code{nil} by default. You can also set this variable to a positive number as a group level. In that case, Gnus scans NoCeM messages when checking new news if this value is not exceeding a group level that you specify as the prefix argument to some commands, e.g. @code{gnus}, @code{gnus-group-get-new-news}, etc. Otherwise, Gnus does not scan NoCeM messages if you specify a group level to those commands. For example, if you use 1 or 2 on the mail groups and the levels on the news groups remain the default, 3 is the best choice. @item gnus-nocem-groups @vindex gnus-nocem-groups Gnus will look for NoCeM messages in the groups in this list. The default is @lisp ("news.lists.filters" "news.admin.net-abuse.bulletins" "alt.nocem.misc" "news.admin.net-abuse.announce") @end lisp @item gnus-nocem-issuers @vindex gnus-nocem-issuers There are many people issuing NoCeM messages. This list says what people you want to listen to. The default is @lisp ("Automoose-1" "clewis@@ferret.ocunix.on.ca" "cosmo.roadkill" "SpamHippo" "hweede@@snafu.de") @end lisp fine, upstanding citizens all of them. Known despammers that you can put in this list are listed at@* @uref{http://www.xs4all.nl/~rosalind/nocemreg/nocemreg.html}. You do not have to heed NoCeM messages from all these people---just the ones you want to listen to. You also don't have to accept all NoCeM messages from the people you like. Each NoCeM message has a @dfn{type} header that gives the message a (more or less, usually less) rigorous definition. Common types are @samp{spam}, @samp{spew}, @samp{mmf}, @samp{binary}, and @samp{troll}. To specify this, you have to use @code{(@var{issuer} @var{conditions} @dots{})} elements in the list. Each condition is either a string (which is a regexp that matches types you want to use) or a list on the form @code{(not @var{string})}, where @var{string} is a regexp that matches types you don't want to use. For instance, if you want all NoCeM messages from Chris Lewis except his @samp{troll} messages, you'd say: @lisp ("clewis@@ferret.ocunix.on.ca" ".*" (not "troll")) @end lisp On the other hand, if you just want nothing but his @samp{spam} and @samp{spew} messages, you'd say: @lisp ("clewis@@ferret.ocunix.on.ca" (not ".*") "spew" "spam") @end lisp The specs are applied left-to-right. @item gnus-nocem-verifyer @vindex gnus-nocem-verifyer @findex pgg-verify This should be a function for verifying that the NoCeM issuer is who she says she is. The default is @code{pgg-verify}, which returns non-@code{nil} if the verification is successful, otherwise (including the case the NoCeM message was not signed) returns @code{nil}. If this is too slow and you don't care for verification (which may be dangerous), you can set this variable to @code{nil}. Formerly the default was @code{mc-verify}, which is a Mailcrypt function. While you can still use it, you can change it into @code{pgg-verify} running with GnuPG if you are willing to add the @acronym{PGP} public keys to GnuPG's keyring. @item gnus-nocem-directory @vindex gnus-nocem-directory This is where Gnus will store its NoCeM cache files. The default is@* @file{~/News/NoCeM/}. @item gnus-nocem-expiry-wait @vindex gnus-nocem-expiry-wait The number of days before removing old NoCeM entries from the cache. The default is 15. If you make it shorter Gnus will be faster, but you might then see old spam. @item gnus-nocem-check-from @vindex gnus-nocem-check-from Non-@code{nil} means check for valid issuers in message bodies. Otherwise don't bother fetching articles unless their author matches a valid issuer; that is much faster if you are selective about the issuers. @item gnus-nocem-check-article-limit @vindex gnus-nocem-check-article-limit If non-@code{nil}, the maximum number of articles to check in any NoCeM group. NoCeM groups can be huge and very slow to process. @end table Using NoCeM could potentially be a memory hog. If you have many living (i. e., subscribed or unsubscribed groups), your Emacs process will grow big. If this is a problem, you should kill off all (or most) of your unsubscribed groups (@pxref{Subscription Commands}). @node Undo @section Undo @cindex undo It is very useful to be able to undo actions one has done. In normal Emacs buffers, it's easy enough---you just push the @code{undo} button. In Gnus buffers, however, it isn't that simple. The things Gnus displays in its buffer is of no value whatsoever to Gnus---it's all just data designed to look nice to the user. Killing a group in the group buffer with @kbd{C-k} makes the line disappear, but that's just a side-effect of the real action---the removal of the group in question from the internal Gnus structures. Undoing something like that can't be done by the normal Emacs @code{undo} function. Gnus tries to remedy this somewhat by keeping track of what the user does and coming up with actions that would reverse the actions the user takes. When the user then presses the @code{undo} key, Gnus will run the code to reverse the previous action, or the previous actions. However, not all actions are easily reversible, so Gnus currently offers a few key functions to be undoable. These include killing groups, yanking groups, and changing the list of read articles of groups. That's it, really. More functions may be added in the future, but each added function means an increase in data to be stored, so Gnus will never be totally undoable. @findex gnus-undo-mode @vindex gnus-use-undo @findex gnus-undo The undoability is provided by the @code{gnus-undo-mode} minor mode. It is used if @code{gnus-use-undo} is non-@code{nil}, which is the default. The @kbd{C-M-_} key performs the @code{gnus-undo} command, which should feel kinda like the normal Emacs @code{undo} command. @node Predicate Specifiers @section Predicate Specifiers @cindex predicate specifiers Some Gnus variables are @dfn{predicate specifiers}. This is a special form that allows flexible specification of predicates without having to type all that much. These specifiers are lists consisting of functions, symbols and lists. Here's an example: @lisp (or gnus-article-unseen-p gnus-article-unread-p) @end lisp The available symbols are @code{or}, @code{and} and @code{not}. The functions all take one parameter. @findex gnus-make-predicate Internally, Gnus calls @code{gnus-make-predicate} on these specifiers to create a function that can be called. This input parameter to this function will be passed along to all the functions in the predicate specifier. @node Moderation @section Moderation @cindex moderation If you are a moderator, you can use the @file{gnus-mdrtn.el} package. It is not included in the standard Gnus package. Write a mail to @samp{larsi@@gnus.org} and state what group you moderate, and you'll get a copy. The moderation package is implemented as a minor mode for summary buffers. Put @lisp (add-hook 'gnus-summary-mode-hook 'gnus-moderate) @end lisp in your @file{~/.gnus.el} file. If you are the moderator of @samp{rec.zoofle}, this is how it's supposed to work: @enumerate @item You split your incoming mail by matching on @samp{Newsgroups:.*rec.zoofle}, which will put all the to-be-posted articles in some mail group---for instance, @samp{nnml:rec.zoofle}. @item You enter that group once in a while and post articles using the @kbd{e} (edit-and-post) or @kbd{s} (just send unedited) commands. @item If, while reading the @samp{rec.zoofle} newsgroup, you happen upon some articles that weren't approved by you, you can cancel them with the @kbd{c} command. @end enumerate To use moderation mode in these two groups, say: @lisp (setq gnus-moderated-list "^nnml:rec.zoofle$\\|^rec.zoofle$") @end lisp @node Fetching a Group @section Fetching a Group @cindex fetching a group @findex gnus-fetch-group It is sometimes convenient to be able to just say I want to read this group and I don't care whether Gnus has been started or not''. This is perhaps more useful for people who write code than for users, but the command @code{gnus-fetch-group} provides this functionality in any case. It takes the group name as a parameter. @node Image Enhancements @section Image Enhancements XEmacs, as well as Emacs 21@footnote{Emacs 21 on MS Windows doesn't support images, Emacs 22 does.} and up, are able to display pictures and stuff, so Gnus has taken advantage of that. @menu * X-Face:: Display a funky, teensy black-and-white image. * Face:: Display a funkier, teensier colored image. * Smileys:: Show all those happy faces the way they were meant to be shown. * Picons:: How to display pictures of what you're reading. * XVarious:: Other XEmacsy Gnusey variables. @end menu @node X-Face @subsection X-Face @cindex x-face @code{X-Face} headers describe a 48x48 pixel black-and-white (1 bit depth) image that's supposed to represent the author of the message. It seems to be supported by an ever-growing number of mail and news readers. @cindex x-face @findex gnus-article-display-x-face @vindex gnus-article-x-face-command @vindex gnus-article-x-face-too-ugly @iftex @iflatex \include{xface} @end iflatex @end iftex @c @anchor{X-Face} Viewing an @code{X-Face} header either requires an Emacs that has @samp{compface} support (which most XEmacs versions has), or that you have suitable conversion or display programs installed. If your Emacs has image support the default action is to display the face before the @code{From} header. If there's no native @code{X-Face} support, Gnus will try to convert the @code{X-Face} header using external programs from the @code{pbmplus} package and friends, see below. For XEmacs it's faster if XEmacs has been compiled with @code{X-Face} support. The default action under Emacs without image support is to fork off the @code{display} program. On a GNU/Linux system, the @code{display} program is included in the ImageMagick package. For external conversion programs look for packages with names like @code{netpbm}, @code{libgr-progs} and @code{compface}. On Windows, you may use the packages @code{netpbm} and @code{compface} from @url{http://gnuwin32.sourceforge.net}. You need to add the @code{bin} directory to your @code{PATH} environment variable. @c In fact only the following DLLs and binaries seem to be required: @c compface1.dll uncompface.exe libnetpbm10.dll icontopbm.exe The variable @code{gnus-article-x-face-command} controls which programs are used to display the @code{X-Face} header. If this variable is a string, this string will be executed in a sub-shell. If it is a function, this function will be called with the face as the argument. If @code{gnus-article-x-face-too-ugly} (which is a regexp) matches the @code{From} header, the face will not be shown. (Note: @code{x-face} is used in the variable/function names, not @code{xface}). @noindent Face and variable: @table @code @item gnus-x-face @vindex gnus-x-face Face to show X-Face. The colors from this face are used as the foreground and background colors of the displayed X-Faces. The default colors are black and white. @end table If you use posting styles, you can use an @code{x-face-file} entry in @code{gnus-posting-styles}, @xref{Posting Styles}. If you don't, Gnus provides a few convenience functions and variables to allow easier insertion of X-Face headers in outgoing messages. You also need the above mentioned ImageMagick, netpbm or other image conversion packages (depending the values of the variables below) for these functions. @findex gnus-random-x-face @vindex gnus-convert-pbm-to-x-face-command @vindex gnus-x-face-directory @code{gnus-random-x-face} goes through all the @samp{pbm} files in @code{gnus-x-face-directory} and picks one at random, and then converts it to the X-Face format by using the @code{gnus-convert-pbm-to-x-face-command} shell command. The @samp{pbm} files should be 48x48 pixels big. It returns the X-Face header data as a string. @findex gnus-insert-random-x-face-header @code{gnus-insert-random-x-face-header} calls @code{gnus-random-x-face} and inserts a @samp{X-Face} header with the randomly generated data. @findex gnus-x-face-from-file @vindex gnus-convert-image-to-x-face-command @code{gnus-x-face-from-file} takes a GIF file as the parameter, and then converts the file to X-Face format by using the @code{gnus-convert-image-to-x-face-command} shell command. Here's how you would typically use the first function. Put something like the following in your @file{~/.gnus.el} file: @lisp (setq message-required-news-headers (nconc message-required-news-headers (list '(X-Face . gnus-random-x-face)))) @end lisp Using the last function would be something like this: @lisp (setq message-required-news-headers (nconc message-required-news-headers (list '(X-Face . (lambda () (gnus-x-face-from-file "~/My-face.gif")))))) @end lisp @node Face @subsection Face @cindex face @c #### FIXME: faces and x-faces' implementations should really be harmonized. @code{Face} headers are essentially a funkier version of @code{X-Face} ones. They describe a 48x48 pixel colored image that's supposed to represent the author of the message. @cindex face @findex gnus-article-display-face The contents of a @code{Face} header must be a base64 encoded PNG image. See @uref{http://quimby.gnus.org/circus/face/} for the precise specifications. Viewing an @code{Face} header requires an Emacs that is able to display PNG images. @c Maybe add this: @c (if (featurep 'xemacs) @c (featurep 'png) @c (image-type-available-p 'png)) Gnus provides a few convenience functions and variables to allow easier insertion of Face headers in outgoing messages. @findex gnus-convert-png-to-face @code{gnus-convert-png-to-face} takes a 48x48 PNG image, no longer than 726 bytes long, and converts it to a face. @findex gnus-face-from-file @vindex gnus-convert-image-to-face-command @code{gnus-face-from-file} takes a JPEG file as the parameter, and then converts the file to Face format by using the @code{gnus-convert-image-to-face-command} shell command. Here's how you would typically use this function. Put something like the following in your @file{~/.gnus.el} file: @lisp (setq message-required-news-headers (nconc message-required-news-headers (list '(Face . (lambda () (gnus-face-from-file "~/face.jpg")))))) @end lisp @node Smileys @subsection Smileys @cindex smileys @iftex @iflatex \gnusfig{-3cm}{0.5cm}{\epsfig{figure=ps/BigFace,height=20cm}} \input{smiley} @end iflatex @end iftex @dfn{Smiley} is a package separate from Gnus, but since Gnus is currently the only package that uses Smiley, it is documented here. In short---to use Smiley in Gnus, put the following in your @file{~/.gnus.el} file: @lisp (setq gnus-treat-display-smileys t) @end lisp Smiley maps text smiley faces---@samp{:-)}, @samp{8-)}, @samp{:-(} and the like---to pictures and displays those instead of the text smiley faces. The conversion is controlled by a list of regexps that matches text and maps that to file names. @vindex smiley-regexp-alist The alist used is specified by the @code{smiley-regexp-alist} variable. The first item in each element is the regexp to be matched; the second element is the regexp match group that is to be replaced by the picture; and the third element is the name of the file to be displayed. The following variables customize where Smiley will look for these files: @table @code @item smiley-data-directory @vindex smiley-data-directory Where Smiley will look for smiley faces files. @item gnus-smiley-file-types @vindex gnus-smiley-file-types List of suffixes on smiley file names to try. @end table @node Picons @subsection Picons @iftex @iflatex \include{picons} @end iflatex @end iftex So@dots{} You want to slow down your news reader even more! This is a good way to do so. It's also a great way to impress people staring over your shoulder as you read news. What are Picons? To quote directly from the Picons Web site: @iftex @iflatex \margindex{} @end iflatex @end iftex @quotation @dfn{Picons} is short for personal icons''. They're small, constrained images used to represent users and domains on the net, organized into databases so that the appropriate image for a given e-mail address can be found. Besides users and domains, there are picon databases for Usenet newsgroups and weather forecasts. The picons are in either monochrome @code{XBM} format or color @code{XPM} and @code{GIF} formats. @end quotation @vindex gnus-picon-databases For instructions on obtaining and installing the picons databases, point your Web browser at @uref{http://www.cs.indiana.edu/picons/ftp/index.html}. If you are using Debian GNU/Linux, saying @samp{apt-get install picons.*} will install the picons where Gnus can find them. To enable displaying picons, simply make sure that @code{gnus-picon-databases} points to the directory containing the Picons databases. The following variables offer control over where things are located. @table @code @item gnus-picon-databases @vindex gnus-picon-databases The location of the picons database. This is a list of directories containing the @file{news}, @file{domains}, @file{users} (and so on) subdirectories. Defaults to @code{("/usr/lib/picon" "/usr/local/faces")}. @item gnus-picon-news-directories @vindex gnus-picon-news-directories List of subdirectories to search in @code{gnus-picon-databases} for newsgroups faces. @code{("news")} is the default. @item gnus-picon-user-directories @vindex gnus-picon-user-directories List of subdirectories to search in @code{gnus-picon-databases} for user faces. @code{("users" "usenix" "local" "misc")} is the default. @item gnus-picon-domain-directories @vindex gnus-picon-domain-directories List of subdirectories to search in @code{gnus-picon-databases} for domain name faces. Defaults to @code{("domains")}. Some people may want to add @samp{"unknown"} to this list. @item gnus-picon-file-types @vindex gnus-picon-file-types Ordered list of suffixes on picon file names to try. Defaults to @code{("xpm" "gif" "xbm")} minus those not built-in your Emacs. @end table @node XVarious @subsection Various XEmacs Variables @table @code @item gnus-xmas-glyph-directory @vindex gnus-xmas-glyph-directory This is where Gnus will look for pictures. Gnus will normally auto-detect this directory, but you may set it manually if you have an unusual directory structure. @item gnus-xmas-modeline-glyph @vindex gnus-xmas-modeline-glyph A glyph displayed in all Gnus mode lines. It is a tiny gnu head by default. @end table @subsubsection Toolbar @table @code @item gnus-use-toolbar @vindex gnus-use-toolbar This variable specifies the position to display the toolbar. If @code{nil}, don't display toolbars. If it is non-@code{nil}, it should be one of the symbols @code{default}, @code{top}, @code{bottom}, @code{right}, and @code{left}. @code{default} means to use the default toolbar, the rest mean to display the toolbar on the place which those names show. The default is @code{default}. @item gnus-toolbar-thickness @vindex gnus-toolbar-thickness Cons of the height and the width specifying the thickness of a toolbar. The height is used for the toolbar displayed on the top or the bottom, the width is used for the toolbar displayed on the right or the left. The default is that of the default toolbar. @item gnus-group-toolbar @vindex gnus-group-toolbar The toolbar in the group buffer. @item gnus-summary-toolbar @vindex gnus-summary-toolbar The toolbar in the summary buffer. @item gnus-summary-mail-toolbar @vindex gnus-summary-mail-toolbar The toolbar in the summary buffer of mail groups. @end table @iftex @iflatex \margindex{} @end iflatex @end iftex @node Fuzzy Matching @section Fuzzy Matching @cindex fuzzy matching Gnus provides @dfn{fuzzy matching} of @code{Subject} lines when doing things like scoring, thread gathering and thread comparison. As opposed to regular expression matching, fuzzy matching is very fuzzy. It's so fuzzy that there's not even a definition of what @dfn{fuzziness} means, and the implementation has changed over time. Basically, it tries to remove all noise from lines before comparing. @samp{Re: }, parenthetical remarks, white space, and so on, are filtered out of the strings before comparing the results. This often leads to adequate results---even when faced with strings generated by text manglers masquerading as newsreaders. @node Thwarting Email Spam @section Thwarting Email Spam @cindex email spam @cindex spam @cindex UCE @cindex unsolicited commercial email In these last days of the Usenet, commercial vultures are hanging about and grepping through news like crazy to find email addresses they can foist off their scams and products to. As a reaction to this, many people have started putting nonsense addresses into their @code{From} lines. I think this is counterproductive---it makes it difficult for people to send you legitimate mail in response to things you write, as well as making it difficult to see who wrote what. This rewriting may perhaps be a bigger menace than the unsolicited commercial email itself in the end. The biggest problem I have with email spam is that it comes in under false pretenses. I press @kbd{g} and Gnus merrily informs me that I have 10 new emails. I say Golly gee! Happy is me!'' and select the mail group, only to find two pyramid schemes, seven advertisements (New! Miracle tonic for growing full, lustrous hair on your toes!'') and one mail asking me to repent and find some god. This is annoying. Here's what you can do about it. @menu * The problem of spam:: Some background, and some solutions * Anti-Spam Basics:: Simple steps to reduce the amount of spam. * SpamAssassin:: How to use external anti-spam tools. * Hashcash:: Reduce spam by burning CPU time. @end menu @node The problem of spam @subsection The problem of spam @cindex email spam @cindex spam filtering approaches @cindex filtering approaches, spam @cindex UCE @cindex unsolicited commercial email First, some background on spam. If you have access to e-mail, you are familiar with spam (technically termed @acronym{UCE}, Unsolicited Commercial E-mail). Simply put, it exists because e-mail delivery is very cheap compared to paper mail, so only a very small percentage of people need to respond to an UCE to make it worthwhile to the advertiser. Ironically, one of the most common spams is the one offering a database of e-mail addresses for further spamming. Senders of spam are usually called @emph{spammers}, but terms like @emph{vermin}, @emph{scum}, @emph{sociopaths}, and @emph{morons} are in common use as well. Spam comes from a wide variety of sources. It is simply impossible to dispose of all spam without discarding useful messages. A good example is the TMDA system, which requires senders unknown to you to confirm themselves as legitimate senders before their e-mail can reach you. Without getting into the technical side of TMDA, a downside is clearly that e-mail from legitimate sources may be discarded if those sources can't or won't confirm themselves through the TMDA system. Another problem with TMDA is that it requires its users to have a basic understanding of e-mail delivery and processing. The simplest approach to filtering spam is filtering, at the mail server or when you sort through incoming mail. If you get 200 spam messages per day from @samp{random-address@@vmadmin.com}, you block @samp{vmadmin.com}. If you get 200 messages about @samp{VIAGRA}, you discard all messages with @samp{VIAGRA} in the message. If you get lots of spam from Bulgaria, for example, you try to filter all mail from Bulgarian IPs. This, unfortunately, is a great way to discard legitimate e-mail. The risks of blocking a whole country (Bulgaria, Norway, Nigeria, China, etc.) or even a continent (Asia, Africa, Europe, etc.) from contacting you should be obvious, so don't do it if you have the choice. In another instance, the very informative and useful RISKS digest has been blocked by overzealous mail filters because it @strong{contained} words that were common in spam messages. Nevertheless, in isolated cases, with great care, direct filtering of mail can be useful. Another approach to filtering e-mail is the distributed spam processing, for instance DCC implements such a system. In essence, @var{N} systems around the world agree that a machine @var{X} in Ghana, Estonia, or California is sending out spam e-mail, and these @var{N} systems enter @var{X} or the spam e-mail from @var{X} into a database. The criteria for spam detection vary---it may be the number of messages sent, the content of the messages, and so on. When a user of the distributed processing system wants to find out if a message is spam, he consults one of those @var{N} systems. Distributed spam processing works very well against spammers that send a large number of messages at once, but it requires the user to set up fairly complicated checks. There are commercial and free distributed spam processing systems. Distributed spam processing has its risks as well. For instance legitimate e-mail senders have been accused of sending spam, and their web sites and mailing lists have been shut down for some time because of the incident. The statistical approach to spam filtering is also popular. It is based on a statistical analysis of previous spam messages. Usually the analysis is a simple word frequency count, with perhaps pairs of words or 3-word combinations thrown into the mix. Statistical analysis of spam works very well in most of the cases, but it can classify legitimate e-mail as spam in some cases. It takes time to run the analysis, the full message must be analyzed, and the user has to store the database of spam analysis. Statistical analysis on the server is gaining popularity. This has the advantage of letting the user Just Read Mail, but has the disadvantage that it's harder to tell the server that it has misclassified mail. Fighting spam is not easy, no matter what anyone says. There is no magic switch that will distinguish Viagra ads from Mom's e-mails. Even people are having a hard time telling spam apart from non-spam, because spammers are actively looking to fool us into thinking they are Mom, essentially. Spamming is irritating, irresponsible, and idiotic behavior from a bunch of people who think the world owes them a favor. We hope the following sections will help you in fighting the spam plague. @node Anti-Spam Basics @subsection Anti-Spam Basics @cindex email spam @cindex spam @cindex UCE @cindex unsolicited commercial email One way of dealing with spam is having Gnus split out all spam into a @samp{spam} mail group (@pxref{Splitting Mail}). First, pick one (1) valid mail address that you can be reached at, and put it in your @code{From} header of all your news articles. (I've chosen @samp{larsi@@trym.ifi.uio.no}, but for many addresses on the form @samp{larsi+usenet@@ifi.uio.no} will be a better choice. Ask your sysadmin whether your sendmail installation accepts keywords in the local part of the mail address.) @lisp (setq message-default-news-headers "From: Lars Magne Ingebrigtsen <larsi@@trym.ifi.uio.no>\n") @end lisp Then put the following split rule in @code{nnmail-split-fancy} (@pxref{Fancy Mail Splitting}): @lisp (... (to "larsi@@trym.ifi.uio.no" (| ("subject" "re:.*" "misc") ("references" ".*@@.*" "misc") "spam")) ...) @end lisp This says that all mail to this address is suspect, but if it has a @code{Subject} that starts with a @samp{Re:} or has a @code{References} header, it's probably ok. All the rest goes to the @samp{spam} group. (This idea probably comes from Tim Pierce.) In addition, many mail spammers talk directly to your @acronym{SMTP} server and do not include your email address explicitly in the @code{To} header. Why they do this is unknown---perhaps it's to thwart this thwarting scheme? In any case, this is trivial to deal with---you just put anything not addressed to you in the @samp{spam} group by ending your fancy split rule in this way: @lisp ( ... (to "larsi" "misc") "spam") @end lisp In my experience, this will sort virtually everything into the right group. You still have to check the @samp{spam} group from time to time to check for legitimate mail, though. If you feel like being a good net citizen, you can even send off complaints to the proper authorities on each unsolicited commercial email---at your leisure. This works for me. It allows people an easy way to contact me (they can just press @kbd{r} in the usual way), and I'm not bothered at all with spam. It's a win-win situation. Forging @code{From} headers to point to non-existent domains is yucky, in my opinion. Be careful with this approach. Spammers are wise to it. @node SpamAssassin @subsection SpamAssassin, Vipul's Razor, DCC, etc @cindex SpamAssassin @cindex Vipul's Razor @cindex DCC The days where the hints in the previous section were sufficient in avoiding spam are coming to an end. There are many tools out there that claim to reduce the amount of spam you get. This section could easily become outdated fast, as new products replace old, but fortunately most of these tools seem to have similar interfaces. Even though this section will use SpamAssassin as an example, it should be easy to adapt it to most other tools. Note that this section does not involve the @code{spam.el} package, which is discussed in the next section. If you don't care for all the features of @code{spam.el}, you can make do with these simple recipes. If the tool you are using is not installed on the mail server, you need to invoke it yourself. Ideas on how to use the @code{:postscript} mail source parameter (@pxref{Mail Source Specifiers}) follow. @lisp (setq mail-sources '((file :prescript "formail -bs spamassassin < /var/mail/%u") (pop :user "jrl" :server "pophost" :postscript "mv %t /tmp/foo; formail -bs spamc < /tmp/foo > %t"))) @end lisp Once you manage to process your incoming spool somehow, thus making the mail contain e.g.@: a header indicating it is spam, you are ready to filter it out. Using normal split methods (@pxref{Splitting Mail}): @lisp (setq nnmail-split-methods '(("spam" "^X-Spam-Flag: YES") ...)) @end lisp Or using fancy split methods (@pxref{Fancy Mail Splitting}): @lisp (setq nnmail-split-methods 'nnmail-split-fancy nnmail-split-fancy '(| ("X-Spam-Flag" "YES" "spam") ...)) @end lisp Some people might not like the idea of piping the mail through various programs using a @code{:prescript} (if some program is buggy, you might lose all mail). If you are one of them, another solution is to call the external tools during splitting. Example fancy split method: @lisp (setq nnmail-split-fancy '(| (: kevin-spamassassin) ...)) (defun kevin-spamassassin () (save-excursion (save-restriction (widen) (if (eq 1 (call-process-region (point-min) (point-max) "spamc" nil nil nil "-c")) "spam")))) @end lisp Note that with the nnimap backend, message bodies will not be downloaded by default. You need to set @code{nnimap-split-download-body} to @code{t} to do that (@pxref{Splitting in IMAP}). That is about it. As some spam is likely to get through anyway, you might want to have a nifty function to call when you happen to read spam. And here is the nifty function: @lisp (defun my-gnus-raze-spam () "Submit SPAM to Vipul's Razor, then mark it as expirable." (interactive) (gnus-summary-show-raw-article) (gnus-summary-save-in-pipe "razor-report -f -d") (gnus-summary-mark-as-expirable 1)) @end lisp @node Hashcash @subsection Hashcash @cindex hashcash A novel technique to fight spam is to require senders to do something costly for each message they send. This has the obvious drawback that you cannot rely on everyone in the world using this technique, since it is not part of the Internet standards, but it may be useful in smaller communities. While the tools in the previous section work well in practice, they work only because the tools are constantly maintained and updated as new form of spam appears. This means that a small percentage of spam will always get through. It also means that somewhere, someone needs to read lots of spam to update these tools. Hashcash avoids that, but instead prefers that everyone you contact through e-mail supports the scheme. You can view the two approaches as pragmatic vs dogmatic. The approaches have their own advantages and disadvantages, but as often in the real world, a combination of them is stronger than either one of them separately. @cindex X-Hashcash The something costly'' is to burn CPU time, more specifically to compute a hash collision up to a certain number of bits. The resulting hashcash cookie is inserted in a @samp{X-Hashcash:} header. For more details, and for the external application @code{hashcash} you need to install to use this feature, see @uref{http://www.cypherspace.org/~adam/hashcash/}. Even more information can be found at @uref{http://www.camram.org/}. If you wish to call hashcash for each message you send, say something like: @lisp (require 'hashcash) (add-hook 'message-send-hook 'mail-add-payment) @end lisp The @file{hashcash.el} library can be found in the Gnus development contrib directory or at @uref{http://users.actrix.gen.nz/mycroft/hashcash.el}. You will need to set up some additional variables as well: @table @code @item hashcash-default-payment @vindex hashcash-default-payment This variable indicates the default number of bits the hash collision should consist of. By default this is 0, meaning nothing will be done. Suggested useful values include 17 to 29. @item hashcash-payment-alist @vindex hashcash-payment-alist Some receivers may require you to spend burn more CPU time than the default. This variable contains a list of @samp{(@var{addr} @var{amount})} cells, where @var{addr} is the receiver (email address or newsgroup) and @var{amount} is the number of bits in the collision that is needed. It can also contain @samp{(@var{addr} @var{string} @var{amount})} cells, where the @var{string} is the string to use (normally the email address or newsgroup name is used). @item hashcash @vindex hashcash Where the @code{hashcash} binary is installed. @end table Currently there is no built in functionality in Gnus to verify hashcash cookies, it is expected that this is performed by your hand customized mail filtering scripts. Improvements in this area would be a useful contribution, however. @node Spam Package @section Spam Package @cindex spam filtering @cindex spam The Spam package provides Gnus with a centralized mechanism for detecting and filtering spam. It filters new mail, and processes messages according to whether they are spam or ham. (@dfn{Ham} is the name used throughout this manual to indicate non-spam messages.) @menu * Spam Package Introduction:: * Filtering Incoming Mail:: * Detecting Spam in Groups:: * Spam and Ham Processors:: * Spam Package Configuration Examples:: * Spam Back Ends:: * Extending the Spam package:: * Spam Statistics Package:: @end menu @node Spam Package Introduction @subsection Spam Package Introduction @cindex spam filtering @cindex spam filtering sequence of events @cindex spam You must read this section to understand how the Spam package works. Do not skip, speed-read, or glance through this section. @cindex spam-initialize @vindex spam-use-stat To use the Spam package, you @strong{must} first run the function @code{spam-initialize}: @example (spam-initialize) @end example This autoloads @code{spam.el} and installs the various hooks necessary to let the Spam package do its job. In order to make use of the Spam package, you have to set up certain group parameters and variables, which we will describe below. All of the variables controlling the Spam package can be found in the @samp{spam} customization group. There are two contact points'' between the Spam package and the rest of Gnus: checking new mail for spam, and leaving a group. Checking new mail for spam is done in one of two ways: while splitting incoming mail, or when you enter a group. The first way, checking for spam while splitting incoming mail, is suited to mail back ends such as @code{nnml} or @code{nnimap}, where new mail appears in a single spool file. The Spam package processes incoming mail, and sends mail considered to be spam to a designated spam'' group. @xref{Filtering Incoming Mail}. The second way is suited to back ends such as @code{nntp}, which have no incoming mail spool, or back ends where the server is in charge of splitting incoming mail. In this case, when you enter a Gnus group, the unseen or unread messages in that group are checked for spam. Detected spam messages are marked as spam. @xref{Detecting Spam in Groups}. @cindex spam back ends In either case, you have to tell the Spam package what method to use to detect spam messages. There are several methods, or @dfn{spam back ends} (not to be confused with Gnus back ends!) to choose from: spam blacklists'' and whitelists'', dictionary-based filters, and so forth. @xref{Spam Back Ends}. In the Gnus summary buffer, messages that have been identified as spam always appear with a @samp{$} symbol.

The Spam package divides Gnus groups into three categories: ham
groups, spam groups, and unclassified groups.  You should mark each of
the groups you subscribe to as either a ham group or a spam group,
using the @code{spam-contents} group parameter (@pxref{Group
Parameters}).  Spam groups have a special property: when you enter a
spam group, all unseen articles are marked as spam.  Thus, mail split
into a spam group is automatically marked as spam.

Identifying spam messages is only half of the Spam package's job.  The
second half comes into play whenever you exit a group buffer.  At this
point, the Spam package does several things:

First, it calls @dfn{spam and ham processors} to process the articles
according to whether they are spam or ham.  There is a pair of spam
and ham processors associated with each spam back end, and what the
processors do depends on the back end.  At present, the main role of
spam and ham processors is for dictionary-based spam filters: they add
the contents of the messages in the group to the filter's dictionary,
to improve its ability to detect future spam.  The @code{spam-process}
group parameter specifies what spam processors to use.  @xref{Spam and
Ham Processors}.

If the spam filter failed to mark a spam message, you can mark it
yourself, so that the message is processed as spam when you exit the
group:

@table @kbd
@item M-d
@itemx M s x
@itemx S x
@kindex M-d
@kindex S x
@kindex M s x
@findex gnus-summary-mark-as-spam
@findex gnus-summary-mark-as-spam
Mark current article as spam, showing it with the @samp{$} mark (@code{gnus-summary-mark-as-spam}). @end table @noindent Similarly, you can unmark an article if it has been erroneously marked as spam. @xref{Setting Marks}. Normally, a ham message found in a non-ham group is not processed as ham---the rationale is that it should be moved into a ham group for further processing (see below). However, you can force these articles to be processed as ham by setting @code{spam-process-ham-in-spam-groups} and @code{spam-process-ham-in-nonham-groups}. @vindex gnus-ham-process-destinations @vindex gnus-spam-process-destinations The second thing that the Spam package does when you exit a group is to move ham articles out of spam groups, and spam articles out of ham groups. Ham in a spam group is moved to the group specified by the variable @code{gnus-ham-process-destinations}, or the group parameter @code{ham-process-destination}. Spam in a ham group is moved to the group specified by the variable @code{gnus-spam-process-destinations}, or the group parameter @code{spam-process-destination}. If these variables are not set, the articles are left in their current group. If an article cannot be moved (e.g., with a read-only backend such as @acronym{NNTP}), it is copied. If an article is moved to another group, it is processed again when you visit the new group. Normally, this is not a problem, but if you want each article to be processed only once, load the @code{gnus-registry.el} package and set the variable @code{spam-log-to-registry} to @code{t}. @xref{Spam Package Configuration Examples}. Normally, spam groups ignore @code{gnus-spam-process-destinations}. However, if you set @code{spam-move-spam-nonspam-groups-only} to @code{nil}, spam will also be moved out of spam groups, depending on the @code{spam-process-destination} parameter. The final thing the Spam package does is to mark spam articles as expired, which is usually the right thing to do. If all this seems confusing, don't worry. Soon it will be as natural as typing Lisp one-liners on a neural interface@dots{} err, sorry, that's 50 years in the future yet. Just trust us, it's not so bad. @node Filtering Incoming Mail @subsection Filtering Incoming Mail @cindex spam filtering @cindex spam filtering incoming mail @cindex spam To use the Spam package to filter incoming mail, you must first set up fancy mail splitting. @xref{Fancy Mail Splitting}. The Spam package defines a special splitting function that you can add to your fancy split variable (either @code{nnmail-split-fancy} or @code{nnimap-split-fancy}, depending on your mail back end): @example (: spam-split) @end example @vindex spam-split-group @noindent The @code{spam-split} function scans incoming mail according to your chosen spam back end(s), and sends messages identified as spam to a spam group. By default, the spam group is a group named @samp{spam}, but you can change this by customizing @code{spam-split-group}. Make sure the contents of @code{spam-split-group} are an unqualified group name. For instance, in an @code{nnimap} server @samp{your-server}, the value @samp{spam} means @samp{nnimap+your-server:spam}. The value @samp{nnimap+server:spam} is therefore wrong---it gives the group @samp{nnimap+your-server:nnimap+server:spam}. @code{spam-split} does not modify the contents of messages in any way. @vindex nnimap-split-download-body Note for IMAP users: if you use the @code{spam-check-bogofilter}, @code{spam-check-ifile}, and @code{spam-check-stat} spam back ends, you should also set set the variable @code{nnimap-split-download-body} to @code{t}. These spam back ends are most useful when they can scan'' the full message body. By default, the nnimap back end only retrieves the message headers; @code{nnimap-split-download-body} tells it to retrieve the message bodies as well. We don't set this by default because it will slow @acronym{IMAP} down, and that is not an appropriate decision to make on behalf of the user. @xref{Splitting in IMAP}. You have to specify one or more spam back ends for @code{spam-split} to use, by setting the @code{spam-use-*} variables. @xref{Spam Back Ends}. Normally, @code{spam-split} simply uses all the spam back ends you enabled in this way. However, you can tell @code{spam-split} to use only some of them. Why this is useful? Suppose you are using the @code{spam-use-regex-headers} and @code{spam-use-blackholes} spam back ends, and the following split rule: @example nnimap-split-fancy '(| (any "ding" "ding") (: spam-split) ;; @r{default mailbox} "mail") @end example @noindent The problem is that you want all ding messages to make it to the ding folder. But that will let obvious spam (for example, spam detected by SpamAssassin, and @code{spam-use-regex-headers}) through, when it's sent to the ding list. On the other hand, some messages to the ding list are from a mail server in the blackhole list, so the invocation of @code{spam-split} can't be before the ding rule. The solution is to let SpamAssassin headers supersede ding rules, and perform the other @code{spam-split} rules (including a second invocation of the regex-headers check) after the ding rule. This is done by passing a parameter to @code{spam-split}: @example nnimap-split-fancy '(| ;; @r{spam detected by @code{spam-use-regex-headers} goes to @samp{regex-spam}} (: spam-split "regex-spam" 'spam-use-regex-headers) (any "ding" "ding") ;; @r{all other spam detected by spam-split goes to @code{spam-split-group}} (: spam-split) ;; @r{default mailbox} "mail") @end example @noindent This lets you invoke specific @code{spam-split} checks depending on your particular needs, and target the results of those checks to a particular spam group. You don't have to throw all mail into all the spam tests. Another reason why this is nice is that messages to mailing lists you have rules for don't have to have resource-intensive blackhole checks performed on them. You could also specify different spam checks for your nnmail split vs. your nnimap split. Go crazy. You should set the @code{spam-use-*} variables for whatever spam back ends you intend to use. The reason is that when loading @file{spam.el}, some conditional loading is done depending on what @code{spam-use-xyz} variables you have set. @xref{Spam Back Ends}. @c @emph{TODO: spam.el needs to provide a uniform way of training all the @c statistical databases. Some have that functionality built-in, others @c don't.} @node Detecting Spam in Groups @subsection Detecting Spam in Groups To detect spam when visiting a group, set the group's @code{spam-autodetect} and @code{spam-autodetect-methods} group parameters. These are accessible with @kbd{G c} or @kbd{G p}, as usual (@pxref{Group Parameters}). You should set the @code{spam-use-*} variables for whatever spam back ends you intend to use. The reason is that when loading @file{spam.el}, some conditional loading is done depending on what @code{spam-use-xyz} variables you have set. By default, only unseen articles are processed for spam. You can force Gnus to recheck all messages in the group by setting the variable @code{spam-autodetect-recheck-messages} to @code{t}. If you use the @code{spam-autodetect} method of checking for spam, you can specify different spam detection methods for different groups. For instance, the @samp{ding} group may have @code{spam-use-BBDB} as the autodetection method, while the @samp{suspect} group may have the @code{spam-use-blacklist} and @code{spam-use-bogofilter} methods enabled. Unlike with @code{spam-split}, you don't have any control over the @emph{sequence} of checks, but this is probably unimportant. @node Spam and Ham Processors @subsection Spam and Ham Processors @cindex spam filtering @cindex spam filtering variables @cindex spam variables @cindex spam @vindex gnus-spam-process-newsgroups Spam and ham processors specify special actions to take when you exit a group buffer. Spam processors act on spam messages, and ham processors on ham messages. At present, the main role of these processors is to update the dictionaries of dictionary-based spam back ends such as Bogofilter (@pxref{Bogofilter}) and the Spam Statistics package (@pxref{Spam Statistics Filtering}). The spam and ham processors that apply to each group are determined by the group's@code{spam-process} group parameter. If this group parameter is not defined, they are determined by the variable @code{gnus-spam-process-newsgroups}. @vindex gnus-spam-newsgroup-contents Gnus learns from the spam you get. You have to collect your spam in one or more spam groups, and set or customize the variable @code{spam-junk-mailgroups} as appropriate. You can also declare groups to contain spam by setting their group parameter @code{spam-contents} to @code{gnus-group-spam-classification-spam}, or by customizing the corresponding variable @code{gnus-spam-newsgroup-contents}. The @code{spam-contents} group parameter and the @code{gnus-spam-newsgroup-contents} variable can also be used to declare groups as @emph{ham} groups if you set their classification to @code{gnus-group-spam-classification-ham}. If groups are not classified by means of @code{spam-junk-mailgroups}, @code{spam-contents}, or @code{gnus-spam-newsgroup-contents}, they are considered @emph{unclassified}. All groups are unclassified by default. @vindex gnus-spam-mark @cindex$
In spam groups, all messages are considered to be spam by default:
they get the @samp{$} mark (@code{gnus-spam-mark}) when you enter the group. If you have seen a message, had it marked as spam, then unmarked it, it won't be marked as spam when you enter the group thereafter. You can disable that behavior, so all unread messages will get the @samp{$} mark, if you set the
@code{spam-mark-only-unseen-as-spam} parameter to @code{nil}.  You
should remove the @samp{$} mark when you are in the group summary buffer for every message that is not spam after all. To remove the @samp{$} mark, you can use @kbd{M-u} to unread'' the article, or
@kbd{d} for declaring it read the non-spam way.  When you leave a
group, all spam-marked (@samp{$}) articles are sent to a spam processor which will study them as spam samples. Messages may also be deleted in various other ways, and unless @code{ham-marks} group parameter gets overridden below, marks @samp{R} and @samp{r} for default read or explicit delete, marks @samp{X} and @samp{K} for automatic or explicit kills, as well as mark @samp{Y} for low scores, are all considered to be associated with articles which are not spam. This assumption might be false, in particular if you use kill files or score files as means for detecting genuine spam, you should then adjust the @code{ham-marks} group parameter. @defvar ham-marks You can customize this group or topic parameter to be the list of marks you want to consider ham. By default, the list contains the deleted, read, killed, kill-filed, and low-score marks (the idea is that these articles have been read, but are not spam). It can be useful to also include the tick mark in the ham marks. It is not recommended to make the unread mark a ham mark, because it normally indicates a lack of classification. But you can do it, and we'll be happy for you. @end defvar @defvar spam-marks You can customize this group or topic parameter to be the list of marks you want to consider spam. By default, the list contains only the spam mark. It is not recommended to change that, but you can if you really want to. @end defvar When you leave @emph{any} group, regardless of its @code{spam-contents} classification, all spam-marked articles are sent to a spam processor, which will study these as spam samples. If you explicit kill a lot, you might sometimes end up with articles marked @samp{K} which you never saw, and which might accidentally contain spam. Best is to make sure that real spam is marked with @samp{$},
and nothing else.

@vindex gnus-ham-process-destinations
When you leave a @emph{spam} group, all spam-marked articles are
marked as expired after processing with the spam processor.  This is
not done for @emph{unclassified} or @emph{ham} groups.  Also, any
@strong{ham} articles in a spam group will be moved to a location
determined by either the @code{ham-process-destination} group
parameter or a match in the @code{gnus-ham-process-destinations}
variable, which is a list of regular expressions matched with group
names (it's easiest to customize this variable with @kbd{M-x
customize-variable @key{RET} gnus-ham-process-destinations}).  Each
group name list is a standard Lisp list, if you prefer to customize
the variable manually.  If the @code{ham-process-destination}
parameter is not set, ham articles are left in place.  If the
set, the ham articles are marked as unread before being moved.

If ham can not be moved---because of a read-only backend such as
@acronym{NNTP}, for example, it will be copied.

Note that you can use multiples destinations per group or regular
expression!  This enables you to send your ham to a regular mail
group and to a @emph{ham training} group.

When you leave a @emph{ham} group, all ham-marked articles are sent to
a ham processor, which will study these as non-spam samples.

@vindex spam-process-ham-in-spam-groups
By default the variable @code{spam-process-ham-in-spam-groups} is
@code{nil}.  Set it to @code{t} if you want ham found in spam groups
to be processed.  Normally this is not done, you are expected instead
to send your ham to a ham group and process it there.

@vindex spam-process-ham-in-nonham-groups
By default the variable @code{spam-process-ham-in-nonham-groups} is
@code{nil}.  Set it to @code{t} if you want ham found in non-ham (spam
or unclassified) groups to be processed.  Normally this is not done,
you are expected instead to send your ham to a ham group and process
it there.

@vindex gnus-spam-process-destinations
When you leave a @emph{ham} or @emph{unclassified} group, all
@strong{spam} articles are moved to a location determined by either
the @code{spam-process-destination} group parameter or a match in the
@code{gnus-spam-process-destinations} variable, which is a list of
regular expressions matched with group names (it's easiest to
customize this variable with @kbd{M-x customize-variable @key{RET}
gnus-spam-process-destinations}).  Each group name list is a standard
Lisp list, if you prefer to customize the variable manually.  If the
@code{spam-process-destination} parameter is not set, the spam
articles are only expired.  The group name is fully qualified, meaning
that if you see @samp{nntp:servername} before the group name in the
group buffer then you need it here as well.

If spam can not be moved---because of a read-only backend such as
@acronym{NNTP}, for example, it will be copied.

Note that you can use multiples destinations per group or regular
expression!  This enables you to send your spam to multiple @emph{spam
training} groups.

@vindex spam-log-to-registry
The problem with processing ham and spam is that Gnus doesn't track
this processing by default.  Enable the @code{spam-log-to-registry}
variable so @code{spam.el} will use @code{gnus-registry.el} to track
what articles have been processed, and avoid processing articles
multiple times.  Keep in mind that if you limit the number of registry
entries, this won't work as well as it does without a limit.

@vindex spam-mark-only-unseen-as-spam
Set this variable if you want only unseen articles in spam groups to
be marked as spam.  By default, it is set.  If you set it to
@code{nil}, unread articles will also be marked as spam.

Set this variable if you want ham to be unmarked before it is moved
out of the spam group.  This is very useful when you use something
like the tick mark @samp{!} to mark ham---the article will be placed
in your @code{ham-process-destination}, unmarked as if it came fresh
from the mail server.

@vindex spam-autodetect-recheck-messages
When autodetecting spam, this variable tells @code{spam.el} whether
only unseen articles or all unread articles should be checked for
spam.  It is recommended that you leave it off.

@node Spam Package Configuration Examples
@subsection Spam Package Configuration Examples
@cindex spam filtering
@cindex spam filtering configuration examples
@cindex spam configuration examples
@cindex spam

From Ted Zlatanov <tzz@@lifelogs.com>.
@example
;; @r{for @code{gnus-registry-split-fancy-with-parent} and spam autodetection}
(gnus-registry-initialize)
(spam-initialize)

(setq
spam-log-to-registry t     ; @r{for spam autodetection}
spam-use-BBDB t
spam-use-regex-headers t   ; @r{catch X-Spam-Flag (SpamAssassin)}
;; @r{all groups with @samp{spam} in the name contain spam}
gnus-spam-newsgroup-contents
'(("spam" gnus-group-spam-classification-spam))
;; @r{see documentation for these}
spam-move-spam-nonspam-groups-only nil
spam-mark-only-unseen-as-spam t
nnimap-split-rule 'nnimap-split-fancy
;; @r{understand what this does before you copy it to your own setup!}
nnimap-split-fancy '(|
;; @r{trace references to parents and put in their group}
(: gnus-registry-split-fancy-with-parent)
;; @r{this will catch server-side SpamAssassin tags}
(any "ding" "ding")
;; @r{note that spam by default will go to @samp{spam}}
(: spam-split)
;; @r{default mailbox}
"mail"))

;; @r{my parameters, set with @kbd{G p}}

;; @r{all nnml groups, and all nnimap groups except}
;; @r{@samp{nnimap+mail.lifelogs.com:train} and}
;; @r{@samp{nnimap+mail.lifelogs.com:spam}: any spam goes to nnimap training,}
;; @r{because it must have been detected manually}

((spam-process-destination . "nnimap+mail.lifelogs.com:train"))

;; @r{all @acronym{NNTP} groups}
;; @r{autodetect spam with the blacklist and ham with the BBDB}
((spam-autodetect-methods spam-use-blacklist spam-use-BBDB)
;; @r{send all spam to the training group}
(spam-process-destination . "nnimap+mail.lifelogs.com:train"))

;; @r{only some @acronym{NNTP} groups, where I want to autodetect spam}
((spam-autodetect . t))

;; @r{my nnimap @samp{nnimap+mail.lifelogs.com:spam} group}

;; @r{this is a spam group}
((spam-contents gnus-group-spam-classification-spam)

;; @r{any spam (which happens when I enter for all unseen messages,}
;; @r{because of the @code{gnus-spam-newsgroup-contents} setting above), goes to}
;; @r{@samp{nnimap+mail.lifelogs.com:train} unless I mark it as ham}

(spam-process-destination "nnimap+mail.lifelogs.com:train")

;; @r{any ham goes to my @samp{nnimap+mail.lifelogs.com:mail} folder, but}
;; @r{also to my @samp{nnimap+mail.lifelogs.com:trainham} folder for training}

(ham-process-destination "nnimap+mail.lifelogs.com:mail"
"nnimap+mail.lifelogs.com:trainham")
;; @r{in this group, only @samp{!} marks are ham}
(ham-marks
(gnus-ticked-mark))
;; @r{remembers senders in the blacklist on the way out---this is}
;; @r{definitely not needed, it just makes me feel better}
(spam-process (gnus-group-spam-exit-processor-blacklist)))

;; @r{Later, on the @acronym{IMAP} server I use the @samp{train} group for training}
;; @r{SpamAssassin to recognize spam, and the @samp{trainham} group fora}
;; @r{recognizing ham---but Gnus has nothing to do with it.}

@end example

@subsubheading Using @file{spam.el} on an IMAP server with a statistical filter on the server
From Reiner Steib <reiner.steib@@gmx.de>.

My provider has set up bogofilter (in combination with @acronym{DCC}) on
the mail server (@acronym{IMAP}).  Recognized spam goes to
@samp{spam.detected}, the rest goes through the normal filter rules,
i.e. to @samp{some.folder} or to @samp{INBOX}.  Training on false
positives or negatives is done by copying or moving the article to
@samp{training.ham} or @samp{training.spam} respectively.  A cron job on
the server feeds those to bogofilter with the suitable ham or spam
options and deletes them from the @samp{training.ham} and
@samp{training.spam} folders.

With the following entries in @code{gnus-parameters}, @code{spam.el}
does most of the job for me:

@lisp
("nnimap:spam\\.detected"
(gnus-article-sort-functions '(gnus-article-sort-by-chars))
(ham-process-destination "nnimap:INBOX" "nnimap:training.ham")
(spam-contents gnus-group-spam-classification-spam))
("nnimap:\$$INBOX\\|other-folders\$$"
(spam-process-destination . "nnimap:training.spam")
(spam-contents gnus-group-spam-classification-ham))
@end lisp

@itemize

@item @b{The Spam folder:}

In the folder @samp{spam.detected}, I have to check for false positives
(i.e. legitimate mails, that were wrongly judged as spam by
bogofilter or DCC).

Because of the @code{gnus-group-spam-classification-spam} entry, all
messages are marked as spam (with @code{$}). When I find a false positive, I mark the message with some other ham mark (@code{ham-marks}, @ref{Spam and Ham Processors}). On group exit, those messages are copied to both groups, @samp{INBOX} (where I want to have the article) and @samp{training.ham} (for training bogofilter) and deleted from the @samp{spam.detected} folder. The @code{gnus-article-sort-by-chars} entry simplifies detection of false positives for me. I receive lots of worms (sweN, @dots{}), that all have a similar size. Grouping them by size (i.e. chars) makes finding other false positives easier. (Of course worms aren't @i{spam} (@acronym{UCE}, @acronym{UBE}) strictly speaking. Anyhow, bogofilter is an excellent tool for filtering those unwanted mails for me.) @item @b{Ham folders:} In my ham folders, I just hit @kbd{S x} (@code{gnus-summary-mark-as-spam}) whenever I see an unrecognized spam mail (false negative). On group exit, those messages are moved to @samp{training.ham}. @end itemize @subsubheading Reporting spam articles in Gmane groups with @code{spam-report.el} From Reiner Steib <reiner.steib@@gmx.de>. With following entry in @code{gnus-parameters}, @kbd{S x} (@code{gnus-summary-mark-as-spam}) marks articles in @code{gmane.*} groups as spam and reports the to Gmane at group exit: @lisp ("^gmane\\." (spam-process (gnus-group-spam-exit-processor-report-gmane))) @end lisp Additionally, I use @code{(setq spam-report-gmane-use-article-number nil)} because I don't read the groups directly from news.gmane.org, but through my local news server (leafnode). I.e. the article numbers are not the same as on news.gmane.org, thus @code{spam-report.el} has to check the @code{X-Report-Spam} header to find the correct number. @node Spam Back Ends @subsection Spam Back Ends @cindex spam back ends The spam package offers a variety of back ends for detecting spam. Each back end defines a set of methods for detecting spam (@pxref{Filtering Incoming Mail}, @pxref{Detecting Spam in Groups}), and a pair of spam and ham processors (@pxref{Spam and Ham Processors}). @menu * Blacklists and Whitelists:: * BBDB Whitelists:: * Gmane Spam Reporting:: * Anti-spam Hashcash Payments:: * Blackholes:: * Regular Expressions Header Matching:: * Bogofilter:: * ifile spam filtering:: * Spam Statistics Filtering:: * SpamOracle:: @end menu @node Blacklists and Whitelists @subsubsection Blacklists and Whitelists @cindex spam filtering @cindex whitelists, spam filtering @cindex blacklists, spam filtering @cindex spam @defvar spam-use-blacklist Set this variable to @code{t} if you want to use blacklists when splitting incoming mail. Messages whose senders are in the blacklist will be sent to the @code{spam-split-group}. This is an explicit filter, meaning that it acts only on mail senders @emph{declared} to be spammers. @end defvar @defvar spam-use-whitelist Set this variable to @code{t} if you want to use whitelists when splitting incoming mail. Messages whose senders are not in the whitelist will be sent to the next spam-split rule. This is an explicit filter, meaning that unless someone is in the whitelist, their messages are not assumed to be spam or ham. @end defvar @defvar spam-use-whitelist-exclusive Set this variable to @code{t} if you want to use whitelists as an implicit filter, meaning that every message will be considered spam unless the sender is in the whitelist. Use with care. @end defvar @defvar gnus-group-spam-exit-processor-blacklist Add this symbol to a group's @code{spam-process} parameter by customizing the group parameters or the @code{gnus-spam-process-newsgroups} variable. When this symbol is added to a group's @code{spam-process} parameter, the senders of spam-marked articles will be added to the blacklist. @emph{WARNING} Instead of the obsolete @code{gnus-group-spam-exit-processor-blacklist}, it is recommended that you use @code{'(spam spam-use-blacklist)}. Everything will work the same way, we promise. @end defvar @defvar gnus-group-ham-exit-processor-whitelist Add this symbol to a group's @code{spam-process} parameter by customizing the group parameters or the @code{gnus-spam-process-newsgroups} variable. When this symbol is added to a group's @code{spam-process} parameter, the senders of ham-marked articles in @emph{ham} groups will be added to the whitelist. Note that this ham processor has no effect in @emph{spam} or @emph{unclassified} groups. @emph{WARNING} Instead of the obsolete @code{gnus-group-ham-exit-processor-whitelist}, it is recommended that you use @code{'(ham spam-use-whitelist)}. Everything will work the same way, we promise. @end defvar Blacklists are lists of regular expressions matching addresses you consider to be spam senders. For instance, to block mail from any sender at @samp{vmadmin.com}, you can put @samp{vmadmin.com} in your blacklist. You start out with an empty blacklist. Blacklist entries use the Emacs regular expression syntax. Conversely, whitelists tell Gnus what addresses are considered legitimate. All messages from whitelisted addresses are considered non-spam. Also see @ref{BBDB Whitelists}. Whitelist entries use the Emacs regular expression syntax. The blacklist and whitelist file locations can be customized with the @code{spam-directory} variable (@file{~/News/spam} by default), or the @code{spam-whitelist} and @code{spam-blacklist} variables directly. The whitelist and blacklist files will by default be in the @code{spam-directory} directory, named @file{whitelist} and @file{blacklist} respectively. @node BBDB Whitelists @subsubsection BBDB Whitelists @cindex spam filtering @cindex BBDB whitelists, spam filtering @cindex BBDB, spam filtering @cindex spam @defvar spam-use-BBDB Analogous to @code{spam-use-whitelist} (@pxref{Blacklists and Whitelists}), but uses the BBDB as the source of whitelisted addresses, without regular expressions. You must have the BBDB loaded for @code{spam-use-BBDB} to work properly. Messages whose senders are not in the BBDB will be sent to the next spam-split rule. This is an explicit filter, meaning that unless someone is in the BBDB, their messages are not assumed to be spam or ham. @end defvar @defvar spam-use-BBDB-exclusive Set this variable to @code{t} if you want to use the BBDB as an implicit filter, meaning that every message will be considered spam unless the sender is in the BBDB. Use with care. Only sender addresses in the BBDB will be allowed through; all others will be classified as spammers. @end defvar @defvar gnus-group-ham-exit-processor-BBDB Add this symbol to a group's @code{spam-process} parameter by customizing the group parameters or the @code{gnus-spam-process-newsgroups} variable. When this symbol is added to a group's @code{spam-process} parameter, the senders of ham-marked articles in @emph{ham} groups will be added to the BBDB. Note that this ham processor has no effect in @emph{spam} or @emph{unclassified} groups. @emph{WARNING} Instead of the obsolete @code{gnus-group-ham-exit-processor-BBDB}, it is recommended that you use @code{'(ham spam-use-BBDB)}. Everything will work the same way, we promise. @end defvar @node Gmane Spam Reporting @subsubsection Gmane Spam Reporting @cindex spam reporting @cindex Gmane, spam reporting @cindex Gmane, spam reporting @cindex spam @defvar gnus-group-spam-exit-processor-report-gmane Add this symbol to a group's @code{spam-process} parameter by customizing the group parameters or the @code{gnus-spam-process-newsgroups} variable. When this symbol is added to a group's @code{spam-process} parameter, the spam-marked articles groups will be reported to the Gmane administrators via a HTTP request. Gmane can be found at @uref{http://gmane.org}. @emph{WARNING} Instead of the obsolete @code{gnus-group-spam-exit-processor-report-gmane}, it is recommended that you use @code{'(spam spam-use-gmane)}. Everything will work the same way, we promise. @end defvar @defvar spam-report-gmane-use-article-number This variable is @code{t} by default. Set it to @code{nil} if you are running your own news server, for instance, and the local article numbers don't correspond to the Gmane article numbers. When @code{spam-report-gmane-use-article-number} is @code{nil}, @code{spam-report.el} will use the @code{X-Report-Spam} header that Gmane provides. @end defvar @node Anti-spam Hashcash Payments @subsubsection Anti-spam Hashcash Payments @cindex spam filtering @cindex hashcash, spam filtering @cindex spam @defvar spam-use-hashcash Similar to @code{spam-use-whitelist} (@pxref{Blacklists and Whitelists}), but uses hashcash tokens for whitelisting messages instead of the sender address. You must have the @code{hashcash.el} package loaded for @code{spam-use-hashcash} to work properly. Messages without a hashcash payment token will be sent to the next spam-split rule. This is an explicit filter, meaning that unless a hashcash token is found, the messages are not assumed to be spam or ham. @end defvar @node Blackholes @subsubsection Blackholes @cindex spam filtering @cindex blackholes, spam filtering @cindex spam @defvar spam-use-blackholes This option is disabled by default. You can let Gnus consult the blackhole-type distributed spam processing systems (DCC, for instance) when you set this option. The variable @code{spam-blackhole-servers} holds the list of blackhole servers Gnus will consult. The current list is fairly comprehensive, but make sure to let us know if it contains outdated servers. The blackhole check uses the @code{dig.el} package, but you can tell @file{spam.el} to use @code{dns.el} instead for better performance if you set @code{spam-use-dig} to @code{nil}. It is not recommended at this time to set @code{spam-use-dig} to @code{nil} despite the possible performance improvements, because some users may be unable to use it, but you can try it and see if it works for you. @end defvar @defvar spam-blackhole-servers The list of servers to consult for blackhole checks. @end defvar @defvar spam-blackhole-good-server-regex A regular expression for IPs that should not be checked against the blackhole server list. When set to @code{nil}, it has no effect. @end defvar @defvar spam-use-dig Use the @code{dig.el} package instead of the @code{dns.el} package. The default setting of @code{t} is recommended. @end defvar Blackhole checks are done only on incoming mail. There is no spam or ham processor for blackholes. @node Regular Expressions Header Matching @subsubsection Regular Expressions Header Matching @cindex spam filtering @cindex regular expressions header matching, spam filtering @cindex spam @defvar spam-use-regex-headers This option is disabled by default. You can let Gnus check the message headers against lists of regular expressions when you set this option. The variables @code{spam-regex-headers-spam} and @code{spam-regex-headers-ham} hold the list of regular expressions. Gnus will check against the message headers to determine if the message is spam or ham, respectively. @end defvar @defvar spam-regex-headers-spam The list of regular expressions that, when matched in the headers of the message, positively identify it as spam. @end defvar @defvar spam-regex-headers-ham The list of regular expressions that, when matched in the headers of the message, positively identify it as ham. @end defvar Regular expression header checks are done only on incoming mail. There is no specific spam or ham processor for regular expressions. @node Bogofilter @subsubsection Bogofilter @cindex spam filtering @cindex bogofilter, spam filtering @cindex spam @defvar spam-use-bogofilter Set this variable if you want @code{spam-split} to use Eric Raymond's speedy Bogofilter. With a minimum of care for associating the @samp{$} mark for spam
articles only, Bogofilter training all gets fairly automatic.  You
should do this until you get a few hundreds of articles in each
category, spam or not.  The command @kbd{S t} in summary mode, either
for debugging or for curiosity, shows the @emph{spamicity} score of
the current article (between 0.0 and 1.0).

Bogofilter determines if a message is spam based on a specific
threshold.  That threshold can be customized, consult the Bogofilter
documentation.

If the @code{bogofilter} executable is not in your path, Bogofilter
processing will be turned off.

You should not enable this if you use @code{spam-use-bogofilter-headers}.

@end defvar

@table @kbd
@item M s t
@itemx S t
@kindex M s t
@kindex S t
@findex spam-bogofilter-score
Get the Bogofilter spamicity score (@code{spam-bogofilter-score}).
@end table

Set this variable if you want @code{spam-split} to use Eric Raymond's
speedy Bogofilter, looking only at the message headers.  It works
similarly to @code{spam-use-bogofilter}, but the @code{X-Bogosity} header
must be in the message already.  Normally you would do this with a
procmail recipe or something similar; consult the Bogofilter
installation documents for details.

You should not enable this if you use @code{spam-use-bogofilter}.

@end defvar

@defvar gnus-group-spam-exit-processor-bogofilter
Add this symbol to a group's @code{spam-process} parameter by
customizing the group parameters or the
@code{gnus-spam-process-newsgroups} variable.  When this symbol is
added to a group's @code{spam-process} parameter, spam-marked articles
will be added to the Bogofilter spam database.

@emph{WARNING}

@code{gnus-group-spam-exit-processor-bogofilter}, it is recommended
that you use @code{'(spam spam-use-bogofilter)}.  Everything will work
the same way, we promise.
@end defvar

@defvar gnus-group-ham-exit-processor-bogofilter
Add this symbol to a group's @code{spam-process} parameter by
customizing the group parameters or the
@code{gnus-spam-process-newsgroups} variable.  When this symbol is
added to a group's @code{spam-process} parameter, the ham-marked
articles in @emph{ham} groups will be added to the Bogofilter database
of non-spam messages.  Note that this ham processor has no effect in
@emph{spam} or @emph{unclassified} groups.

@emph{WARNING}

@code{gnus-group-ham-exit-processor-bogofilter}, it is recommended
that you use @code{'(ham spam-use-bogofilter)}.  Everything will work
the same way, we promise.
@end defvar

@defvar spam-bogofilter-database-directory

This is the directory where Bogofilter will store its databases.  It
is not specified by default, so Bogofilter will use its own default
database directory.

@end defvar

The Bogofilter mail classifier is similar to @command{ifile} in intent and
purpose.  A ham and a spam processor are provided, plus the
variables to indicate to spam-split that Bogofilter should either be
used, or has already been used on the article.  The 0.9.2.1 version of
Bogofilter was used to test this functionality.

@node ifile spam filtering
@subsubsection ifile spam filtering
@cindex spam filtering
@cindex ifile, spam filtering
@cindex spam

@defvar spam-use-ifile

Enable this variable if you want @code{spam-split} to use @command{ifile}, a
statistical analyzer similar to Bogofilter.

@end defvar

@defvar spam-ifile-all-categories

Enable this variable if you want @code{spam-use-ifile} to give you all
the ifile categories, not just spam/non-spam.  If you use this, make
sure you train ifile as described in its documentation.

@end defvar

@defvar spam-ifile-spam-category

This is the category of spam messages as far as ifile is concerned.
The actual string used is irrelevant, but you probably want to leave
the default value of @samp{spam}.
@end defvar

@defvar spam-ifile-database

This is the filename for the ifile database.  It is not specified by
default, so ifile will use its own default database name.

@end defvar

The ifile mail classifier is similar to Bogofilter in intent and
purpose.  A ham and a spam processor are provided, plus the
@code{spam-use-ifile} variable to indicate to spam-split that ifile
should be used.  The 1.2.1 version of ifile was used to test this
functionality.

@node Spam Statistics Filtering
@subsubsection Spam Statistics Filtering
@cindex spam filtering
@cindex spam-stat, spam filtering
@cindex spam-stat
@cindex spam

This back end uses the Spam Statistics Emacs Lisp package to perform
statistics-based filtering (@pxref{Spam Statistics Package}).  Before
using this, you may want to perform some additional steps to
initialize your Spam Statistics dictionary.  @xref{Creating a
spam-stat dictionary}.

@defvar spam-use-stat

@end defvar

@defvar gnus-group-spam-exit-processor-stat
Add this symbol to a group's @code{spam-process} parameter by
customizing the group parameters or the
@code{gnus-spam-process-newsgroups} variable.  When this symbol is
added to a group's @code{spam-process} parameter, the spam-marked
articles will be added to the spam-stat database of spam messages.

@emph{WARNING}

@code{gnus-group-spam-exit-processor-stat}, it is recommended
that you use @code{'(spam spam-use-stat)}.  Everything will work
the same way, we promise.
@end defvar

@defvar gnus-group-ham-exit-processor-stat
Add this symbol to a group's @code{spam-process} parameter by
customizing the group parameters or the
@code{gnus-spam-process-newsgroups} variable.  When this symbol is
added to a group's @code{spam-process} parameter, the ham-marked
articles in @emph{ham} groups will be added to the spam-stat database
of non-spam messages.  Note that this ham processor has no effect in
@emph{spam} or @emph{unclassified} groups.

@emph{WARNING}

@code{gnus-group-ham-exit-processor-stat}, it is recommended
that you use @code{'(ham spam-use-stat)}.  Everything will work
the same way, we promise.
@end defvar

This enables @file{spam.el} to cooperate with @file{spam-stat.el}.
@file{spam-stat.el} provides an internal (Lisp-only) spam database,
which unlike ifile or Bogofilter does not require external programs.
A spam and a ham processor, and the @code{spam-use-stat} variable for
@code{spam-split} are provided.

@node SpamOracle
@subsubsection Using SpamOracle with Gnus
@cindex spam filtering
@cindex SpamOracle
@cindex spam

An easy way to filter out spam is to use SpamOracle.  SpamOracle is an
statistical mail filtering tool written by Xavier Leroy and needs to be
installed separately.

There are several ways to use SpamOracle with Gnus.  In all cases, your
mail is piped through SpamOracle in its @emph{mark} mode.  SpamOracle will
then enter an @samp{X-Spam} header indicating whether it regards the
mail as a spam mail or not.

One possibility is to run SpamOracle as a @code{:prescript} from the
@xref{Mail Source Specifiers}, (@pxref{SpamAssassin}).  This method has

The easiest method is to make @file{spam.el} (@pxref{Spam Package})
call SpamOracle.

@vindex spam-use-spamoracle
To enable SpamOracle usage by @file{spam.el}, set the variable
@code{spam-use-spamoracle} to @code{t} and configure the
@code{nnmail-split-fancy} or @code{nnimap-split-fancy}.  @xref{Spam
Package}.  In this example the @samp{INBOX} of an nnimap server is
filtered using SpamOracle.  Mails recognized as spam mails will be
moved to @code{spam-split-group}, @samp{Junk} in this case.  Ham
messages stay in @samp{INBOX}:

@example
(setq spam-use-spamoracle t
spam-split-group "Junk"
nnimap-split-inbox '("INBOX")
nnimap-split-rule 'nnimap-split-fancy
nnimap-split-fancy '(| (: spam-split) "INBOX"))
@end example

@defvar spam-use-spamoracle
Set to @code{t} if you want Gnus to enable spam filtering using
SpamOracle.
@end defvar

@defvar spam-spamoracle-binary
Gnus uses the SpamOracle binary called @file{spamoracle} found in the
user's PATH.  Using the variable @code{spam-spamoracle-binary}, this
can be customized.
@end defvar

@defvar spam-spamoracle-database
By default, SpamOracle uses the file @file{~/.spamoracle.db} as a database to
store its analysis.  This is controlled by the variable
@code{spam-spamoracle-database} which defaults to @code{nil}.  That means
the default SpamOracle database will be used.  In case you want your
database to live somewhere special, set
@code{spam-spamoracle-database} to this path.
@end defvar

SpamOracle employs a statistical algorithm to determine whether a
message is spam or ham.  In order to get good results, meaning few
false hits or misses, SpamOracle needs training.  SpamOracle learns
(training mode) one has to feed good (ham) and spam mails to
SpamOracle.  This can be done by pressing @kbd{|} in the Summary
buffer and pipe the mail to a SpamOracle process or using
@file{spam.el}'s spam- and ham-processors, which is much more
convenient.  For a detailed description of spam- and ham-processors,
@xref{Spam Package}.

@defvar gnus-group-spam-exit-processor-spamoracle
Add this symbol to a group's @code{spam-process} parameter by
customizing the group parameter or the
@code{gnus-spam-process-newsgroups} variable.  When this symbol is added
to a group's @code{spam-process} parameter, spam-marked articles will be
sent to SpamOracle as spam samples.

@emph{WARNING}

@code{gnus-group-spam-exit-processor-spamoracle}, it is recommended
that you use @code{'(spam spam-use-spamoracle)}.  Everything will work
the same way, we promise.
@end defvar

@defvar gnus-group-ham-exit-processor-spamoracle
Add this symbol to a group's @code{spam-process} parameter by
customizing the group parameter or the
@code{gnus-spam-process-newsgroups} variable.  When this symbol is added
to a group's @code{spam-process} parameter, the ham-marked articles in
@emph{ham} groups will be sent to the SpamOracle as samples of ham
messages.  Note that this ham processor has no effect in @emph{spam} or
@emph{unclassified} groups.

@emph{WARNING}

@code{gnus-group-ham-exit-processor-spamoracle}, it is recommended
that you use @code{'(ham spam-use-spamoracle)}.  Everything will work
the same way, we promise.
@end defvar

@emph{Example:} These are the Group Parameters of a group that has been
classified as a ham group, meaning that it should only contain ham
messages.
@example
((spam-contents gnus-group-spam-classification-ham)
(spam-process ((ham spam-use-spamoracle)
(spam spam-use-spamoracle))))
@end example
For this group the @code{spam-use-spamoracle} is installed for both
ham and spam processing.  If the group contains spam message
(e.g. because SpamOracle has not had enough sample messages yet) and
the user marks some messages as spam messages, these messages will be
processed by SpamOracle.  The processor sends the messages to
SpamOracle as new samples for spam.

@node Extending the Spam package
@subsection Extending the Spam package
@cindex spam filtering
@cindex spam elisp package, extending
@cindex extending the spam elisp package

Say you want to add a new back end called blackbox.  For filtering
incoming mail, provide the following:

@enumerate

@item
Code

@lisp
(defvar spam-use-blackbox nil
"True if blackbox should be used.")
@end lisp

@lisp
(spam-use-blackbox   . spam-check-blackbox)
@end lisp
to @code{spam-list-of-checks}.

@lisp
(gnus-group-ham-exit-processor-blackbox  ham spam-use-blackbox)
(gnus-group-spam-exit-processor-blackbox spam spam-use-blackbox)
@end lisp

to @code{spam-list-of-processors}.

@lisp
(spam-use-blackbox spam-blackbox-register-routine
nil
spam-blackbox-unregister-routine
nil)
@end lisp

to @code{spam-registration-functions}.  Write the register/unregister
routines using the bogofilter register/unregister routines as a
start, or other register/unregister routines more appropriate to
Blackbox.

@item
Functionality

Write the @code{spam-check-blackbox} function.  It should return
@samp{nil} or @code{spam-split-group}, observing the other
conventions.  See the existing @code{spam-check-*} functions for
examples of what you can do, and stick to the template unless you
fully understand the reasons why you aren't.

Make sure to add @code{spam-use-blackbox} to
@code{spam-list-of-statistical-checks} if Blackbox is a statistical
mail analyzer that needs the full message body to operate.

@end enumerate

For processing spam and ham messages, provide the following:

@enumerate

@item
Code

Note you don't have to provide a spam or a ham processor.  Only
provide them if Blackbox supports spam or ham processing.

Also, ham and spam processors are being phased out as single
variables.  Instead the form @code{'(spam spam-use-blackbox)} or
@code{'(ham spam-use-blackbox)} is favored.  For now, spam/ham
processor variables are still around but they won't be for long.

@lisp
(defvar gnus-group-spam-exit-processor-blackbox "blackbox-spam"
"The Blackbox summary exit spam processor.
Only applicable to spam groups.")

(defvar gnus-group-ham-exit-processor-blackbox "blackbox-ham"
"The whitelist summary exit ham processor.
Only applicable to non-spam (unclassified and ham) groups.")

@end lisp

@item
Gnus parameters

@lisp
(const :tag "Spam: Blackbox" (spam spam-use-blackbox))
(const :tag "Ham: Blackbox"  (ham spam-use-blackbox))
@end lisp
to the @code{spam-process} group parameter in @code{gnus.el}.  Make
sure you do it twice, once for the parameter and once for the
variable customization.

@lisp
(variable-item spam-use-blackbox)
@end lisp
to the @code{spam-autodetect-methods} group parameter in
@code{gnus.el}.

@end enumerate

@node Spam Statistics Package
@subsection Spam Statistics Package
@cindex Paul Graham
@cindex Graham, Paul
@cindex naive Bayesian spam filtering
@cindex Bayesian spam filtering, naive
@cindex spam filtering, naive Bayesian

Paul Graham has written an excellent essay about spam filtering using
statistics: @uref{http://www.paulgraham.com/spam.html,A Plan for
Spam}.  In it he describes the inherent deficiency of rule-based
filtering as used by SpamAssassin, for example: Somebody has to write
the rules, and everybody else has to install these rules.  You are
always late.  It would be much better, he argues, to filter mail based
on whether it somehow resembles spam or non-spam.  One way to measure
this is word distribution.  He then goes on to describe a solution
that checks whether a new mail resembles any of your other spam mails
or not.

The basic idea is this:  Create a two collections of your mail, one
with spam, one with non-spam.  Count how often each word appears in
either collection, weight this by the total number of mails in the
collections, and store this information in a dictionary.  For every
word in a new mail, determine its probability to belong to a spam or a
non-spam mail.  Use the 15 most conspicuous words, compute the total
probability of the mail being spam.  If this probability is higher
than a certain threshold, the mail is considered to be spam.

The Spam Statistics package adds support to Gnus for this kind of
filtering.  It can be used as one of the back ends of the Spam package
(@pxref{Spam Package}), or by itself.

Before using the Spam Statistics package, you need to set it up.
First, you need two collections of your mail, one with spam, one with
non-spam.  Then you need to create a dictionary using these two
collections, and save it.  And last but not least, you need to use
this dictionary in your fancy mail splitting rules.

* Creating a spam-stat dictionary::
* Splitting mail using spam-stat::
* Low-level interface to the spam-stat dictionary::

@node Creating a spam-stat dictionary
@subsubsection Creating a spam-stat dictionary

Before you can begin to filter spam based on statistics, you must
create these statistics based on two mail collections, one with spam,
one with non-spam.  These statistics are then stored in a dictionary
for later use.  In order for these statistics to be meaningful, you
need several hundred emails in both collections.

Gnus currently supports only the nnml back end for automated dictionary
creation.  The nnml back end stores all mails in a directory, one file
per mail.  Use the following:

@defun spam-stat-process-spam-directory
Create spam statistics for every file in this directory.  Every file
is treated as one spam mail.
@end defun

@defun spam-stat-process-non-spam-directory
Create non-spam statistics for every file in this directory.  Every
file is treated as one non-spam mail.
@end defun

Usually you would call @code{spam-stat-process-spam-directory} on a
directory such as @file{~/Mail/mail/spam} (this usually corresponds to
the group @samp{nnml:mail.spam}), and you would call
@code{spam-stat-process-non-spam-directory} on a directory such as
@file{~/Mail/mail/misc} (this usually corresponds to the group
@samp{nnml:mail.misc}).

When you are using @acronym{IMAP}, you won't have the mails available
locally, so that will not work.  One solution is to use the Gnus Agent
to cache the articles.  Then you can use directories such as
@file{"~/News/agent/nnimap/mail.yourisp.com/personal_spam"} for
@code{spam-stat-process-spam-directory}.  @xref{Agent as Cache}.

@defvar spam-stat
This variable holds the hash-table with all the statistics---the
dictionary we have been talking about.  For every word in either
collection, this hash-table stores a vector describing how often the
word appeared in spam and often it appeared in non-spam mails.
@end defvar

If you want to regenerate the statistics from scratch, you need to
reset the dictionary.

@defun spam-stat-reset
Reset the @code{spam-stat} hash-table, deleting all the statistics.
@end defun

When you are done, you must save the dictionary.  The dictionary may
be rather large.  If you will not update the dictionary incrementally
(instead, you will recreate it once a month, for example), then you
can reduce the size of the dictionary by deleting all words that did
not appear often enough or that do not clearly belong to only spam or
only non-spam mails.

@defun spam-stat-reduce-size
Reduce the size of the dictionary.  Use this only if you do not want
to update the dictionary incrementally.
@end defun

@defun spam-stat-save
Save the dictionary.
@end defun

@defvar spam-stat-file
The filename used to store the dictionary.  This defaults to
@file{~/.spam-stat.el}.
@end defvar

@node Splitting mail using spam-stat
@subsubsection Splitting mail using spam-stat

This section describes how to use the Spam statistics
@emph{independently} of the @xref{Spam Package}.

@lisp
(require 'spam-stat)
@end lisp

This will load the necessary Gnus code, and the dictionary you
created.

Next, you need to adapt your fancy splitting rules:  You need to
determine how to use @code{spam-stat}.  The following examples are for
the nnml back end.  Using the nnimap back end works just as well.  Just

In the simplest case, you only have two groups, @samp{mail.misc} and
@samp{mail.spam}.  The following expression says that mail is either
spam or it should go into @samp{mail.misc}.  If it is spam, then
@code{spam-stat-split-fancy} will return @samp{mail.spam}.

@lisp
(setq nnmail-split-fancy
(| (: spam-stat-split-fancy)
"mail.misc"))
@end lisp

@defvar spam-stat-split-fancy-spam-group
The group to use for spam.  Default is @samp{mail.spam}.
@end defvar

If you also filter mail with specific subjects into other groups, use
the following expression.  Only mails not matching the regular
expression are considered potential spam.

@lisp
(setq nnmail-split-fancy
(| ("Subject" "\\bspam-stat\\b" "mail.emacs")
(: spam-stat-split-fancy)
"mail.misc"))
@end lisp

If you want to filter for spam first, then you must be careful when
creating the dictionary.  Note that @code{spam-stat-split-fancy} must
consider both mails in @samp{mail.emacs} and in @samp{mail.misc} as
non-spam, therefore both should be in your collection of non-spam
mails, when creating the dictionary!

@lisp
(setq nnmail-split-fancy
(| (: spam-stat-split-fancy)
("Subject" "\\bspam-stat\\b" "mail.emacs")
"mail.misc"))
@end lisp

You can combine this with traditional filtering.  Here, we move all
HTML-only mails into the @samp{mail.spam.filtered} group.  Note that since
@code{spam-stat-split-fancy} will never see them, the mails in
@samp{mail.spam.filtered} should be neither in your collection of spam mails,
nor in your collection of non-spam mails, when creating the
dictionary!

@lisp
(setq nnmail-split-fancy
(| ("Content-Type" "text/html" "mail.spam.filtered")
(: spam-stat-split-fancy)
("Subject" "\\bspam-stat\\b" "mail.emacs")
"mail.misc"))
@end lisp

@node Low-level interface to the spam-stat dictionary
@subsubsection Low-level interface to the spam-stat dictionary

The main interface to using @code{spam-stat}, are the following functions:

@defun spam-stat-buffer-is-spam
Called in a buffer, that buffer is considered to be a new spam mail.
Use this for new mail that has not been processed before.
@end defun

@defun spam-stat-buffer-is-no-spam
Called in a buffer, that buffer is considered to be a new non-spam
mail.  Use this for new mail that has not been processed before.
@end defun

@defun spam-stat-buffer-change-to-spam
Called in a buffer, that buffer is no longer considered to be normal
mail but spam.  Use this to change the status of a mail that has
@end defun

@defun spam-stat-buffer-change-to-non-spam
Called in a buffer, that buffer is no longer considered to be spam but
normal mail.  Use this to change the status of a mail that has already
been processed as spam.
@end defun

@defun spam-stat-save
Save the hash table to the file.  The filename used is stored in the
variable @code{spam-stat-file}.
@end defun

Load the hash table from a file.  The filename used is stored in the
variable @code{spam-stat-file}.
@end defun

@defun spam-stat-score-word
Return the spam score for a word.
@end defun

@defun spam-stat-score-buffer
Return the spam score for a buffer.
@end defun

@defun spam-stat-split-fancy
Use this function for fancy mail splitting.  Add the rule @samp{(:
spam-stat-split-fancy)} to @code{nnmail-split-fancy}
@end defun

Make sure you load the dictionary before using it.  This requires the

@lisp
(require 'spam-stat)
@end lisp

Typical test will involve calls to the following functions:

@smallexample
Reset: (setq spam-stat (make-hash-table :test 'equal))
Learn spam: (spam-stat-process-spam-directory "~/Mail/mail/spam")
Learn non-spam: (spam-stat-process-non-spam-directory "~/Mail/mail/misc")
Save table: (spam-stat-save)
File size: (nth 7 (file-attributes spam-stat-file))
Number of words: (hash-table-count spam-stat)
Test spam: (spam-stat-test-directory "~/Mail/mail/spam")
Test non-spam: (spam-stat-test-directory "~/Mail/mail/misc")
Reduce table size: (spam-stat-reduce-size)
Save table: (spam-stat-save)
File size: (nth 7 (file-attributes spam-stat-file))
Number of words: (hash-table-count spam-stat)
Test spam: (spam-stat-test-directory "~/Mail/mail/spam")
Test non-spam: (spam-stat-test-directory "~/Mail/mail/misc")
@end smallexample

Here is how you would create your dictionary:

@smallexample
Reset: (setq spam-stat (make-hash-table :test 'equal))
Learn spam: (spam-stat-process-spam-directory "~/Mail/mail/spam")
Learn non-spam: (spam-stat-process-non-spam-directory "~/Mail/mail/misc")
Repeat for any other non-spam group you need...
Reduce table size: (spam-stat-reduce-size)
Save table: (spam-stat-save)
@end smallexample

@node Other modes
@section Interaction with other modes

@subsection Dired
@cindex dired

@code{gnus-dired-minor-mode} provides some useful functions for dired
buffers.  It is enabled with
@lisp
@end lisp

@table @kbd
@item C-c C-m C-a
@findex gnus-dired-attach
@cindex attachments, selection via dired
Send dired's marked files as an attachment (@code{gnus-dired-attach}).
You will be prompted for a message buffer.

@item C-c C-m C-l
@findex gnus-dired-find-file-mailcap
Visit a file according to the appropriate mailcap entry
(@code{gnus-dired-find-file-mailcap}).  With prefix, open file in a new
buffer.

@item C-c C-m C-p
@findex gnus-dired-print
Print file according to the mailcap entry (@code{gnus-dired-print}).  If
there is no print command, print in a PostScript image.
@end table

@node Various Various
@section Various Various
@cindex mode lines
@cindex highlights

@table @code

@item gnus-home-directory
@vindex gnus-home-directory
All Gnus file and directory variables will be initialized from this
variable, which defaults to @file{~/}.

@item gnus-directory
@vindex gnus-directory
Most Gnus storage file and directory variables will be initialized from
this variable, which defaults to the @env{SAVEDIR} environment
variable, or @file{~/News/} if that variable isn't set.

Note that Gnus is mostly loaded when the @file{~/.gnus.el} file is read.
This means that other directory variables that are initialized from this
variable won't be set properly if you set this variable in
@file{~/.gnus.el}.  Set this variable in @file{.emacs} instead.

@item gnus-default-directory
@vindex gnus-default-directory
Not related to the above variable at all---this variable says what the
default directory of all Gnus buffers should be.  If you issue commands
like @kbd{C-x C-f}, the prompt you'll get starts in the current buffer's
default directory.  If this variable is @code{nil} (which is the
default), the default directory will be the default directory of the
buffer you were in when you started Gnus.

@item gnus-verbose
@vindex gnus-verbose
This variable is an integer between zero and ten.  The higher the value,
the more messages will be displayed.  If this variable is zero, Gnus
will never flash any messages, if it is seven (which is the default),
most important messages will be shown, and if it is ten, Gnus won't ever
shut up, but will flash so many messages it will make your head swim.

@item gnus-verbose-backends
@vindex gnus-verbose-backends
This variable works the same way as @code{gnus-verbose}, but it applies
to the Gnus back ends instead of Gnus proper.

as little as possible.  This variable (default 8192) specifies
the absolute max length the back ends will try to read before giving up
on finding a separator line between the head and the body.  If this
variable is @code{nil}, there is no upper read bound.  If it is
@code{t}, the back ends won't try to read the articles piece by piece,
but read the entire articles.  This makes sense with some versions of
@code{ange-ftp} or @code{efs}.

This variable (default 2048) says how big a piece of each article to
read when doing the operation described above.

@cindex file names
@cindex invalid characters in file names
@cindex characters in file names
This is an alist that says how to translate characters in file names.
For instance, if @samp{:} is invalid as a file character in file names
on your system (you OS/2 user you), you could say something like:

@lisp
@group
'((?: . ?_)))
@end group
@end lisp

In fact, this is the default value for this variable on OS/2 and MS
Windows (phooey) systems.

@item gnus-hidden-properties
@vindex gnus-hidden-properties
This is a list of properties to use to hide invisible'' text.  It is
@code{(invisible t intangible t)} by default on most systems, which
makes invisible text invisible and intangible.

A hook called before parsing headers.  It can be used, for instance, to
gather statistics on the headers fetched, or perhaps you'd like to prune
some headers.  I don't see why you'd want that, though.

@item gnus-shell-command-separator
@vindex gnus-shell-command-separator
String used to separate two shell commands.  The default is @samp{;}.

@item gnus-invalid-group-regexp
@vindex gnus-invalid-group-regexp

Regexp to match invalid'' group names when querying user for a group
name.  The default value catches some @strong{really} invalid group
names who could possibly mess up Gnus internally (like allowing
@samp{:} in a group name, which is normally used to delimit method and
group).

@acronym{IMAP} users might want to allow @samp{/} in group names though.

@end table

@node The End
@chapter The End

Well, that's the manual---you can get on with your life now.  Keep in
touch.  Say hello to your cats from me.

My @strong{ghod}---I just can't stand goodbyes.  Sniffle.

Ol' Charles Reznikoff said it pretty well, so I leave the floor to him:

@quotation
@strong{Te Deum}

@sp 1
Not because of victories @*
I sing,@*
having none,@*
but for the common sunshine,@*
the breeze,@*
the largess of the spring.

@sp 1
Not for victory@*
but for the day's work done@*
as well as I was able;@*
not for a seat upon the dais@*
but at the common table.@*
@end quotation

@node Appendices
@chapter Appendices

* XEmacs::                      Requirements for installing under XEmacs.
* History::                     How Gnus got where it is today.
* On Writing Manuals::          Why this is not a beginner's guide.
* Terminology::                 We use really difficult, like, words here.
* Customization::               Tailoring Gnus to your needs.
* Troubleshooting::             What you might try if things do not work.
* Gnus Reference Guide::        Rilly, rilly technical stuff.
* Emacs for Heathens::          A short introduction to Emacsian terms.
* Frequently Asked Questions::  The Gnus FAQ

@node XEmacs
@section XEmacs
@cindex XEmacs
@cindex installing under XEmacs

XEmacs is distributed as a collection of packages.  You should install
whatever packages the Gnus XEmacs package requires.  The current
requirements are @samp{gnus}, @samp{mail-lib}, @samp{xemacs-base},
@samp{eterm}, @samp{sh-script}, @samp{net-utils}, @samp{os-utils},
@samp{dired}, @samp{mh-e}, @samp{sieve}, @samp{ps-print}, @samp{W3},
@samp{pgg}, @samp{mailcrypt}, @samp{ecrypto}, and @samp{sasl}.

@node History
@section History

@cindex history
@sc{gnus} was written by Masanobu @sc{Umeda}.  When autumn crept up in
'94, Lars Magne Ingebrigtsen grew bored and decided to rewrite Gnus.

If you want to investigate the person responsible for this outrage,
you can point your (feh!) web browser to
@uref{http://quimby.gnus.org/}.  This is also the primary
distribution point for the new and spiffy versions of Gnus, and is
known as The Site That Destroys Newsrcs And Drives People Mad.

During the first extended alpha period of development, the new Gnus was
called (ding) Gnus''.  @dfn{(ding)} is, of course, short for
@dfn{ding is not Gnus}, which is a total and utter lie, but who cares?
(Besides, the Gnus'' in this abbreviation should probably be
pronounced news'' as @sc{Umeda} intended, which makes it a more
appropriate name, don't you think?)

In any case, after spending all that energy on coming up with a new and
spunky name, we decided that the name was @emph{too} spunky, so we
renamed it back again to Gnus''.  But in mixed case.  Gnus'' vs.
@sc{gnus}''.  New vs. old.

* Gnus Versions::               What Gnus versions have been released.
* Other Gnus Versions::         Other Gnus versions that also have been released.
* Why?::                        What's the point of Gnus?
* Compatibility::               Just how compatible is Gnus with @sc{gnus}?
* Conformity::                  Gnus tries to conform to all standards.
* Emacsen::                     Gnus can be run on a few modern Emacsen.
* Gnus Development::            How Gnus is developed.
* Contributors::                Oodles of people.
* New Features::                Pointers to some of the new stuff in Gnus.

@node Gnus Versions
@subsection Gnus Versions
@cindex ding Gnus
@cindex September Gnus
@cindex Red Gnus
@cindex Quassia Gnus
@cindex Pterodactyl Gnus
@cindex Oort Gnus
@cindex No Gnus
@cindex Gnus versions

The first proper'' release of Gnus 5 was done in November 1995 when it
was included in the Emacs 19.30 distribution (132 (ding) Gnus releases
plus 15 Gnus 5.0 releases).

In May 1996 the next Gnus generation (aka. September Gnus'' (after 99
releases)) was released under the name Gnus 5.2'' (40 releases).

On July 28th 1996 work on Red Gnus was begun, and it was released on
January 25th 1997 (after 84 releases) as Gnus 5.4'' (67 releases).

On September 13th 1997, Quassia Gnus was started and lasted 37 releases.
It was released as Gnus 5.6'' on March 8th 1998 (46 releases).

Gnus 5.6 begat Pterodactyl Gnus on August 29th 1998 and was released as
Gnus 5.8'' (after 99 releases and a CVS repository) on December 3rd
1999.

On the 26th of October 2000, Oort Gnus was begun and was released as
Gnus 5.10 on May 1st 2003 (24 releases).

On the January 4th 2004, No Gnus was begun.

If you happen upon a version of Gnus that has a prefixed name --
(ding) Gnus'', September Gnus'', Red Gnus'', Quassia Gnus'',
Pterodactyl Gnus'', Oort Gnus'', No Gnus'' -- don't panic.
Don't let it know that you're frightened.  Back away.  Slowly.  Whatever
you do, don't run.  Walk away, calmly, until you're out of its reach.
Find a proper released version of Gnus and snuggle up to that instead.

@node Other Gnus Versions
@subsection Other Gnus Versions
@cindex Semi-gnus

In addition to the versions of Gnus which have had their releases
coordinated by Lars, one major development has been Semi-gnus from
Japan.  It's based on a library called @acronym{SEMI}, which provides
@acronym{MIME} capabilities.

These Gnusae are based mainly on Gnus 5.6 and Pterodactyl Gnus.
Collectively, they are called Semi-gnus'', and different strains are
called T-gnus, ET-gnus, Nana-gnus and Chaos.  These provide powerful
@acronym{MIME} and multilingualization things, especially important for
Japanese users.

@node Why?
@subsection Why?

What's the point of Gnus?

I want to provide a rad'', happening'', way cool'' and hep''
newsreader, that lets you do anything you can think of.  That was my
original motivation, but while working on Gnus, it has become clear to
me that this generation of newsreaders really belong in the stone age.
Newsreaders haven't developed much since the infancy of the net.  If the
volume continues to rise with the current rate of increase, all current
newsreaders will be pretty much useless.  How do you deal with
newsgroups that have thousands of new articles each day?  How do you
keep track of millions of people who post?

Gnus offers no real solutions to these questions, but I would very much
like to see Gnus being used as a testing ground for new methods of
reading and fetching news.  Expanding on @sc{Umeda}-san's wise decision
to separate the newsreader from the back ends, Gnus now offers a simple
interface for anybody who wants to write new back ends for fetching mail
and news from different sources.  I have added hooks for customizations
everywhere I could imagine it being useful.  By doing so, I'm inviting
every one of you to explore and invent.

May Gnus never be complete.  @kbd{C-u 100 M-x all-hail-emacs} and
@kbd{C-u 100 M-x all-hail-xemacs}.

@node Compatibility
@subsection Compatibility

@cindex compatibility
Gnus was designed to be fully compatible with @sc{gnus}.  Almost all key
bindings have been kept.  More key bindings have been added, of course,
but only in one or two obscure cases have old bindings been changed.

Our motto is:
@quotation
@cartouche
@center In a cloud bones of steel.
@end cartouche
@end quotation

All commands have kept their names.  Some internal functions have changed
their names.

The @code{gnus-uu} package has changed drastically.  @xref{Decoding
Articles}.

One major compatibility question is the presence of several summary
buffers.  All variables relevant while reading a group are
buffer-local to the summary buffer they belong in.  Although many
important variables have their values copied into their global
counterparts whenever a command is executed in the summary buffer, this
change might lead to incorrect values being used unless you are careful.

All code that relies on knowledge of @sc{gnus} internals will probably
fail.  To take two examples: Sorting @code{gnus-newsrc-alist} (or
changing it in any way, as a matter of fact) is strictly verboten.  Gnus
maintains a hash table that points to the entries in this alist (which
speeds up many functions), and changing the alist directly will lead to
peculiar results.

@cindex hilit19
@cindex highlighting
Old hilit19 code does not work at all.  In fact, you should probably
remove all hilit code from all Gnus hooks
(@code{gnus-group-prepare-hook} and @code{gnus-summary-prepare-hook}).
Gnus provides various integrated functions for highlighting.  These are
faster and more accurate.  To make life easier for everybody, Gnus will
by default remove all hilit calls from all hilit hooks.  Uncleanliness!
Away!

Packages like @code{expire-kill} will no longer work.  As a matter of
fact, you should probably remove all old @sc{gnus} packages (and other
code) when you start using Gnus.  More likely than not, Gnus already
does what you have written code to make @sc{gnus} do.  (Snicker.)

Even though old methods of doing things are still supported, only the
new methods are documented in this manual.  If you detect a new method of
doing something while reading this manual, that does not mean you have
to stop doing it the old way.

Gnus understands all @sc{gnus} startup files.

@kindex M-x gnus-bug
@findex gnus-bug
@cindex reporting bugs
@cindex bugs
Overall, a casual user who hasn't written much code that depends on
@sc{gnus} internals should suffer no problems.  If problems occur,
please let me know by issuing that magic command @kbd{M-x gnus-bug}.

@vindex gnus-bug-create-help-buffer
If you are in the habit of sending bug reports @emph{very} often, you
may find the helpful help buffer annoying after a while.  If so, set
@code{gnus-bug-create-help-buffer} to @code{nil} to avoid having it pop
up at you.

@node Conformity
@subsection Conformity

No rebels without a clue here, ma'am.  We conform to all standards known
to (wo)man.  Except for those standards and/or conventions we disagree
with, of course.

@table @strong

@item RFC (2)822
@cindex RFC 822
@cindex RFC 2822
There are no known breaches of this standard.

@item RFC 1036
@cindex RFC 1036
There are no known breaches of this standard, either.

@item Son-of-RFC 1036
@cindex Son-of-RFC 1036
We do have some breaches to this one.

@table @emph

@itemx User-Agent
These are considered to be vanity headers'', while I consider them
to be consumer information.  After seeing so many badly formatted
articles coming from @code{tin} and @code{Netscape} I know not to use
either of those for posting articles.  I would not have known that if
@end table

@item USEFOR
@cindex USEFOR
USEFOR is an IETF working group writing a successor to RFC 1036, based
on Son-of-RFC 1036.  They have produced a number of drafts proposing
various changes to the format of news articles.  The Gnus towers will
look into implementing the changes when the draft is accepted as an RFC.

@item MIME - RFC 2045-2049 etc
@cindex @acronym{MIME}
All the various @acronym{MIME} RFCs are supported.

@item Disposition Notifications - RFC 2298

@item PGP - RFC 1991 and RFC 2440
@cindex RFC 1991
@cindex RFC 2440
RFC 1991 is the original @acronym{PGP} message specification,
published as an informational RFC.  RFC 2440 was the follow-up, now
called Open PGP, and put on the Standards Track.  Both document a
non-@acronym{MIME} aware @acronym{PGP} format.  Gnus supports both
encoding (signing and encryption) and decoding (verification and
decryption).

@item PGP/MIME - RFC 2015/3156
RFC 2015 (superseded by 3156 which references RFC 2440 instead of RFC
1991) describes the @acronym{MIME}-wrapping around the RFC 1991/2440 format.
Gnus supports both encoding and decoding.

@item S/MIME - RFC 2633
RFC 2633 describes the @acronym{S/MIME} format.

@item IMAP - RFC 1730/2060, RFC 2195, RFC 2086, RFC 2359, RFC 2595, RFC 1731
RFC 1730 is @acronym{IMAP} version 4, updated somewhat by RFC 2060
(@acronym{IMAP} 4 revision 1).  RFC 2195 describes CRAM-MD5
authentication for @acronym{IMAP}.  RFC 2086 describes access control
lists (ACLs) for @acronym{IMAP}.  RFC 2359 describes a @acronym{IMAP}
protocol enhancement.  RFC 2595 describes the proper @acronym{TLS}
integration (STARTTLS) with @acronym{IMAP}.  RFC 1731 describes the
GSSAPI/Kerberos4 mechanisms for @acronym{IMAP}.

@end table

If you ever notice Gnus acting non-compliant with regards to the texts
mentioned above, don't hesitate to drop a note to Gnus Towers and let us
know.

@node Emacsen
@subsection Emacsen
@cindex Emacsen
@cindex XEmacs
@cindex Mule
@cindex Emacs

Gnus should work on:

@itemize @bullet

@item
Emacs 21.1 and up.

@item
XEmacs 21.4 and up.

@end itemize

This Gnus version will absolutely not work on any Emacsen older than
that.  Not reliably, at least.  Older versions of Gnus may work on older
Emacs versions.  Particularly, Gnus 5.10.8 should also work on Emacs
20.7 and XEmacs 21.1.

There are some vague differences between Gnus on the various
platforms---XEmacs features more graphics (a logo and a toolbar)---but
other than that, things should look pretty much the same under all
Emacsen.

@node Gnus Development
@subsection Gnus Development

Gnus is developed in a two-phased cycle.  The first phase involves much
discussion on the @samp{ding@@gnus.org} mailing list, where people
propose changes and new features, post patches and new back ends.  This
phase is called the @dfn{alpha} phase, since the Gnusae released in this
phase are @dfn{alpha releases}, or (perhaps more commonly in other
circles) @dfn{snapshots}.  During this phase, Gnus is assumed to be
unstable and should not be used by casual users.  Gnus alpha releases
have names like Red Gnus'' and Quassia Gnus''.

After futzing around for 50-100 alpha releases, Gnus is declared
@dfn{frozen}, and only bug fixes are applied.  Gnus loses the prefix,
and is called things like Gnus 5.6.32'' instead.  Normal people are
supposed to be able to use these, and these are mostly discussed on the
@samp{gnu.emacs.gnus} newsgroup.

@cindex Incoming*
@vindex mail-source-delete-incoming
Some variable defaults differ between alpha Gnusae and released Gnusae.
In particular, @code{mail-source-delete-incoming} defaults to @code{nil} in
alpha Gnusae and @code{t} in released Gnusae.  This is to prevent
lossage of mail if an alpha release hiccups while handling the mail.

The division of discussion between the ding mailing list and the Gnus
newsgroup is not purely based on publicity concerns.  It's true that
having people write about the horrible things that an alpha Gnus release
can do (sometimes) in a public forum may scare people off, but more
importantly, talking about new experimental features that have been
introduced may confuse casual users.  New features are frequently
introduced, fiddled with, and judged to be found wanting, and then
usually keep up with these rapid changes, while people on the newsgroup
can't be assumed to do so.

@node Contributors
@subsection Contributors
@cindex contributors

The new Gnus version couldn't have been done without the help of all the
people on the (ding) mailing list.  Every day for over a year I have
gotten billions of nice bug reports from them, filling me with joy,
every single one of them.  Smooches.  The people on the list have been
tried beyond endurance, what with my oh, that's a neat idea <type
type>, yup, I'll release it right away <ship off> no wait, that doesn't
work at all <type type>, yup, I'll ship that one off right away <ship
off> no, wait, that absolutely does not work'' policy for releases.
Micro$oft---bah. Amateurs. I'm @emph{much} worse. (Or is that worser''? much worser''? worsest''?) I would like to take this opportunity to thank the Academy for@dots{} oops, wrong show. @itemize @bullet @item Masanobu @sc{Umeda}---the writer of the original @sc{gnus}. @item Shenghuo Zhu---uudecode.el, mm-uu.el, rfc1843.el, webmail.el, nnwarchive and many, many other things connected with @acronym{MIME} and other types of en/decoding, as well as general bug fixing, new functionality and stuff. @item Per Abrahamsen---custom, scoring, highlighting and @sc{soup} code (as well as numerous other things). @item Luis Fernandes---design and graphics. @item Joe Reiss---creator of the smiley faces. @item Justin Sheehy---the @acronym{FAQ} maintainer. @item Erik Naggum---help, ideas, support, code and stuff. @item Wes Hardaker---@file{gnus-picon.el} and the manual section on @dfn{picons} (@pxref{Picons}). @item Kim-Minh Kaplan---further work on the picon code. @item Brad Miller---@file{gnus-gl.el} and the GroupLens manual section (@pxref{GroupLens}). @item Sudish Joseph---innumerable bug fixes. @item Ilja Weis---@file{gnus-topic.el}. @item Steven L. Baur---lots and lots and lots of bugs detections and fixes. @item Vladimir Alexiev---the refcard and reference booklets. @item Felix Lee & Jamie Zawinski---I stole some pieces from the XGnus distribution by Felix Lee and JWZ. @item Scott Byer---@file{nnfolder.el} enhancements & rewrite. @item Peter Mutsaers---orphan article scoring code. @item Ken Raeburn---POP mail support. @item Hallvard B Furuseth---various bits and pieces, especially dealing with .newsrc files. @item Brian Edmonds---@file{gnus-bbdb.el}. @item David Moore---rewrite of @file{nnvirtual.el} and many other things. @item Kevin Davidson---came up with the name @dfn{ding}, so blame him. @item François Pinard---many, many interesting and thorough bug reports, as well as autoconf support. @end itemize This manual was proof-read by Adrian Aichner, with Ricardo Nassif, Mark Borges, and Jost Krieger proof-reading parts of the manual. The following people have contributed many patches and suggestions: Christopher Davis, Andrew Eskilsson, Kai Grossjohann, Kevin Greiner, Jesper Harder, Paul Jarc, Simon Josefsson, David Kågedal, Richard Pieri, Fabrice Popineau, Daniel Quinlan, Michael Shields, Reiner Steib, Jason L. Tibbitts, III, Jack Vinson, Katsumi Yamaoka, @c Yamaoka and Teodor Zlatanov. Also thanks to the following for patches and stuff: Jari Aalto, Adrian Aichner, Vladimir Alexiev, Russ Allbery, Peter Arius, Matt Armstrong, Marc Auslander, Miles Bader, Alexei V. Barantsev, Frank Bennett, Robert Bihlmeyer, Chris Bone, Mark Borges, Mark Boyns, Lance A. Brown, Rob Browning, Kees de Bruin, Martin Buchholz, Joe Buehler, Kevin Buhr, Alastair Burt, Joao Cachopo, Zlatko Calusic, Massimo Campostrini, Castor, David Charlap, Dan Christensen, Kevin Christian, Jae-you Chung, @c ? James H. Cloos, Jr., Laura Conrad, Michael R. Cook, Glenn Coombs, Andrew J. Cosgriff, Neil Crellin, Frank D. Cringle, Geoffrey T. Dairiki, Andre Deparade, Ulrik Dickow, Dave Disser, Rui-Tao Dong, @c ? Joev Dubach, Michael Welsh Duggan, Dave Edmondson, Paul Eggert, Mark W. Eichin, Karl Eichwalder, Enami Tsugutomo, @c Enami Michael Ernst, Luc Van Eycken, Sam Falkner, Nelson Jose dos Santos Ferreira, Sigbjorn Finne, Sven Fischer, Paul Fisher, Decklin Foster, Gary D. Foster, Paul Franklin, Guy Geens, Arne Georg Gleditsch, David S. Goldberg, Michelangelo Grigni, Dale Hagglund, D. Hall, Magnus Hammerin, Kenichi Handa, @c Handa Raja R. Harinath, Yoshiki Hayashi, @c Hayashi P. E. Jareth Hein, Hisashige Kenji, @c Hisashige Scott Hofmann, Marc Horowitz, Gunnar Horrigmo, Richard Hoskins, Brad Howes, Miguel de Icaza, François Felix Ingrand, Tatsuya Ichikawa, @c Ichikawa Ishikawa Ichiro, @c Ishikawa Lee Iverson, Iwamuro Motonori, @c Iwamuro Rajappa Iyer, Andreas Jaeger, Adam P. Jenkins, Randell Jesup, Fred Johansen, Gareth Jones, Greg Klanderman, Karl Kleinpaste, Michael Klingbeil, Peter Skov Knudsen, Shuhei Kobayashi, @c Kobayashi Petr Konecny, Koseki Yoshinori, @c Koseki Thor Kristoffersen, Jens Lautenbacher, Martin Larose, Seokchan Lee, @c Lee Joerg Lenneis, Carsten Leonhardt, James LewisMoss, Christian Limpach, Markus Linnala, Dave Love, Mike McEwan, Tonny Madsen, Shlomo Mahlab, Nat Makarevitch, Istvan Marko, David Martin, Jason R. Mastaler, Gordon Matzigkeit, Timo Metzemakers, Richard Mlynarik, Lantz Moore, Morioka Tomohiko, @c Morioka Erik Toubro Nielsen, Hrvoje Niksic, Andy Norman, Fred Oberhauser, C. R. Oldham, Alexandre Oliva, Ken Olstad, Masaharu Onishi, @c Onishi Hideki Ono, @c Ono Ettore Perazzoli, William Perry, Stephen Peters, Jens-Ulrik Holger Petersen, Ulrich Pfeifer, Matt Pharr, Andy Piper, John McClary Prevost, Bill Pringlemeir, Mike Pullen, Jim Radford, Colin Rafferty, Lasse Rasinen, Lars Balker Rasmussen, Joe Reiss, Renaud Rioboo, Roland B. Roberts, Bart Robinson, Christian von Roques, Markus Rost, Jason Rumney, Wolfgang Rupprecht, Jay Sachs, Dewey M. Sasser, Conrad Sauerwald, Loren Schall, Dan Schmidt, Ralph Schleicher, Philippe Schnoebelen, Andreas Schwab, Randal L. Schwartz, Danny Siu, Matt Simmons, Paul D. Smith, Jeff Sparkes, Toby Speight, Michael Sperber, Darren Stalder, Richard Stallman, Greg Stark, Sam Steingold, Paul Stevenson, Jonas Steverud, Paul Stodghill, Kiyokazu Suto, @c Suto Kurt Swanson, Samuel Tardieu, Teddy, Chuck Thompson, Tozawa Akihiko, @c Tozawa Philippe Troin, James Troup, Trung Tran-Duc, Jack Twilley, Aaron M. Ucko, Aki Vehtari, Didier Verna, Vladimir Volovich, Jan Vroonhof, Stefan Waldherr, Pete Ware, Barry A. Warsaw, Christoph Wedler, Joe Wells, Lee Willis, and Lloyd Zusman. For a full overview of what each person has done, the ChangeLogs included in the Gnus alpha distributions should give ample reading (550kB and counting). Apologies to everybody that I've forgotten, of which there are many, I'm sure. Gee, that's quite a list of people. I guess that must mean that there actually are people who are using Gnus. Who'd'a thunk it! @node New Features @subsection New Features @cindex new features @menu * ding Gnus:: New things in Gnus 5.0/5.1, the first new Gnus. * September Gnus:: The Thing Formally Known As Gnus 5.2/5.3. * Red Gnus:: Third time best---Gnus 5.4/5.5. * Quassia Gnus:: Two times two is four, or Gnus 5.6/5.7. * Pterodactyl Gnus:: Pentad also starts with P, AKA Gnus 5.8/5.9. * Oort Gnus:: It's big. It's far out. Gnus 5.10/5.11. @end menu These lists are, of course, just @emph{short} overviews of the @emph{most} important new features. No, really. There are tons more. Yes, we have feeping creaturism in full effect. @node ding Gnus @subsubsection (ding) Gnus New features in Gnus 5.0/5.1: @itemize @bullet @item The look of all buffers can be changed by setting format-like variables (@pxref{Group Buffer Format} and @pxref{Summary Buffer Format}). @item Local spool and several @acronym{NNTP} servers can be used at once (@pxref{Select Methods}). @item You can combine groups into virtual groups (@pxref{Virtual Groups}). @item You can read a number of different mail formats (@pxref{Getting Mail}). All the mail back ends implement a convenient mail expiry scheme (@pxref{Expiring Mail}). @item Gnus can use various strategies for gathering threads that have lost their roots (thereby gathering loose sub-threads into one thread) or it can go back and retrieve enough headers to build a complete thread (@pxref{Customizing Threading}). @item Killed groups can be displayed in the group buffer, and you can read them as well (@pxref{Listing Groups}). @item Gnus can do partial group updates---you do not have to retrieve the entire active file just to check for new articles in a few groups (@pxref{The Active File}). @item Gnus implements a sliding scale of subscribedness to groups (@pxref{Group Levels}). @item You can score articles according to any number of criteria (@pxref{Scoring}). You can even get Gnus to find out how to score articles for you (@pxref{Adaptive Scoring}). @item Gnus maintains a dribble buffer that is auto-saved the normal Emacs manner, so it should be difficult to lose much data on what you have read if your machine should go down (@pxref{Auto Save}). @item Gnus now has its own startup file (@file{~/.gnus.el}) to avoid cluttering up the @file{.emacs} file. @item You can set the process mark on both groups and articles and perform operations on all the marked items (@pxref{Process/Prefix}). @item You can grep through a subset of groups and create a group from the results (@pxref{Kibozed Groups}). @item You can list subsets of groups according to, well, anything (@pxref{Listing Groups}). @item You can browse foreign servers and subscribe to groups from those servers (@pxref{Browse Foreign Server}). @item Gnus can fetch articles, asynchronously, on a second connection to the server (@pxref{Asynchronous Fetching}). @item You can cache articles locally (@pxref{Article Caching}). @item The uudecode functions have been expanded and generalized (@pxref{Decoding Articles}). @item You can still post uuencoded articles, which was a little-known feature of @sc{gnus}' past (@pxref{Uuencoding and Posting}). @item Fetching parents (and other articles) now actually works without glitches (@pxref{Finding the Parent}). @item Gnus can fetch @acronym{FAQ}s and group descriptions (@pxref{Group Information}). @item Digests (and other files) can be used as the basis for groups (@pxref{Document Groups}). @item Articles can be highlighted and customized (@pxref{Customizing Articles}). @item URLs and other external references can be buttonized (@pxref{Article Buttons}). @item You can do lots of strange stuff with the Gnus window & frame configuration (@pxref{Window Layout}). @item You can click on buttons instead of using the keyboard (@pxref{Buttons}). @end itemize @node September Gnus @subsubsection September Gnus @iftex @iflatex \gnusfig{-28cm}{0cm}{\epsfig{figure=ps/september,height=20cm}} @end iflatex @end iftex New features in Gnus 5.2/5.3: @itemize @bullet @item A new message composition mode is used. All old customization variables for @code{mail-mode}, @code{rnews-reply-mode} and @code{gnus-msg} are now obsolete. @item Gnus is now able to generate @dfn{sparse} threads---threads where missing articles are represented by empty nodes (@pxref{Customizing Threading}). @lisp (setq gnus-build-sparse-threads 'some) @end lisp @item Outgoing articles are stored on a special archive server (@pxref{Archived Messages}). @item Partial thread regeneration now happens when articles are referred. @item Gnus can make use of GroupLens predictions (@pxref{GroupLens}). @item Picons (personal icons) can be displayed under XEmacs (@pxref{Picons}). @item A @code{trn}-like tree buffer can be displayed (@pxref{Tree Display}). @lisp (setq gnus-use-trees t) @end lisp @item An @code{nn}-like pick-and-read minor mode is available for the summary buffers (@pxref{Pick and Read}). @lisp (add-hook 'gnus-summary-mode-hook 'gnus-pick-mode) @end lisp @item In binary groups you can use a special binary minor mode (@pxref{Binary Groups}). @item Groups can be grouped in a folding topic hierarchy (@pxref{Group Topics}). @lisp (add-hook 'gnus-group-mode-hook 'gnus-topic-mode) @end lisp @item Gnus can re-send and bounce mail (@pxref{Summary Mail Commands}). @item Groups can now have a score, and bubbling based on entry frequency is possible (@pxref{Group Score}). @lisp (add-hook 'gnus-summary-exit-hook 'gnus-summary-bubble-group) @end lisp @item Groups can be process-marked, and commands can be performed on groups of groups (@pxref{Marking Groups}). @item Caching is possible in virtual groups. @item @code{nndoc} now understands all kinds of digests, mail boxes, rnews news batches, ClariNet briefs collections, and just about everything else (@pxref{Document Groups}). @item Gnus has a new back end (@code{nnsoup}) to create/read SOUP packets (@pxref{SOUP}). @item The Gnus cache is much faster. @item Groups can be sorted according to many criteria (@pxref{Sorting Groups}). @item New group parameters have been introduced to set list-addresses and expiry times (@pxref{Group Parameters}). @item All formatting specs allow specifying faces to be used (@pxref{Formatting Fonts}). @item There are several more commands for setting/removing/acting on process marked articles on the @kbd{M P} submap (@pxref{Setting Process Marks}). @item The summary buffer can be limited to show parts of the available articles based on a wide range of criteria. These commands have been bound to keys on the @kbd{/} submap (@pxref{Limiting}). @item Articles can be made persistent with the @kbd{*} command (@pxref{Persistent Articles}). @item All functions for hiding article elements are now toggles. @item Article headers can be buttonized (@pxref{Article Washing}). @item All mail back ends support fetching articles by @code{Message-ID}. @item Duplicate mail can now be treated properly (@pxref{Duplicates}). @item All summary mode commands are available directly from the article buffer (@pxref{Article Keymap}). @item Frames can be part of @code{gnus-buffer-configuration} (@pxref{Window Layout}). @item Mail can be re-scanned by a daemonic process (@pxref{Daemons}). @iftex @iflatex \marginpar[\mbox{}\hfill\epsfig{figure=ps/fseptember,height=5cm}]{\epsfig{figure=ps/fseptember,height=5cm}} @end iflatex @end iftex @item Gnus can make use of NoCeM files to weed out spam (@pxref{NoCeM}). @lisp (setq gnus-use-nocem t) @end lisp @item Groups can be made permanently visible (@pxref{Listing Groups}). @lisp (setq gnus-permanently-visible-groups "^nnml:") @end lisp @item Many new hooks have been introduced to make customizing easier. @item Gnus respects the @code{Mail-Copies-To} header. @item Threads can be gathered by looking at the @code{References} header (@pxref{Customizing Threading}). @lisp (setq gnus-summary-thread-gathering-function 'gnus-gather-threads-by-references) @end lisp @item Read articles can be stored in a special backlog buffer to avoid refetching (@pxref{Article Backlog}). @lisp (setq gnus-keep-backlog 50) @end lisp @item A clean copy of the current article is always stored in a separate buffer to allow easier treatment. @item Gnus can suggest where to save articles (@pxref{Saving Articles}). @item Gnus doesn't have to do as much prompting when saving (@pxref{Saving Articles}). @lisp (setq gnus-prompt-before-saving t) @end lisp @item @code{gnus-uu} can view decoded files asynchronously while fetching articles (@pxref{Other Decode Variables}). @lisp (setq gnus-uu-grabbed-file-functions 'gnus-uu-grab-view) @end lisp @item Filling in the article buffer now works properly on cited text (@pxref{Article Washing}). @item Hiding cited text adds buttons to toggle hiding, and how much cited text to hide is now customizable (@pxref{Article Hiding}). @lisp (setq gnus-cited-lines-visible 2) @end lisp @item Boring headers can be hidden (@pxref{Article Hiding}). @item Default scoring values can now be set from the menu bar. @item Further syntax checking of outgoing articles have been added. @end itemize @node Red Gnus @subsubsection Red Gnus New features in Gnus 5.4/5.5: @iftex @iflatex \gnusfig{-5.5cm}{-4cm}{\epsfig{figure=ps/red,height=20cm}} @end iflatex @end iftex @itemize @bullet @item @file{nntp.el} has been totally rewritten in an asynchronous fashion. @item Article prefetching functionality has been moved up into Gnus (@pxref{Asynchronous Fetching}). @item Scoring can now be performed with logical operators like @code{and}, @code{or}, @code{not}, and parent redirection (@pxref{Advanced Scoring}). @item Article washing status can be displayed in the article mode line (@pxref{Misc Article}). @item @file{gnus.el} has been split into many smaller files. @item Suppression of duplicate articles based on Message-ID can be done (@pxref{Duplicate Suppression}). @lisp (setq gnus-suppress-duplicates t) @end lisp @item New variables for specifying what score and adapt files are to be considered home score and adapt files (@pxref{Home Score File}) have been added. @item @code{nndoc} was rewritten to be easily extendable (@pxref{Document Server Internals}). @item Groups can inherit group parameters from parent topics (@pxref{Topic Parameters}). @item Article editing has been revamped and is now actually usable. @item Signatures can be recognized in more intelligent fashions (@pxref{Article Signature}). @item Summary pick mode has been made to look more @code{nn}-like. Line numbers are displayed and the @kbd{.} command can be used to pick articles (@code{Pick and Read}). @item Commands for moving the @file{.newsrc.eld} from one server to another have been added (@pxref{Changing Servers}). @item There's a way now to specify that uninteresting'' fields be suppressed when generating lines in buffers (@pxref{Advanced Formatting}). @item Several commands in the group buffer can be undone with @kbd{C-M-_} (@pxref{Undo}). @item Scoring can be done on words using the new score type @code{w} (@pxref{Score File Format}). @item Adaptive scoring can be done on a Subject word-by-word basis (@pxref{Adaptive Scoring}). @lisp (setq gnus-use-adaptive-scoring '(word)) @end lisp @item Scores can be decayed (@pxref{Score Decays}). @lisp (setq gnus-decay-scores t) @end lisp @item Scoring can be performed using a regexp on the Date header. The Date is normalized to compact ISO 8601 format first (@pxref{Score File Format}). @item A new command has been added to remove all data on articles from the native server (@pxref{Changing Servers}). @item A new command for reading collections of documents (@code{nndoc} with @code{nnvirtual} on top) has been added---@kbd{C-M-d} (@pxref{Really Various Summary Commands}). @item Process mark sets can be pushed and popped (@pxref{Setting Process Marks}). @item A new mail-to-news back end makes it possible to post even when the @acronym{NNTP} server doesn't allow posting (@pxref{Mail-To-News Gateways}). @item A new back end for reading searches from Web search engines (@dfn{DejaNews}, @dfn{Alta Vista}, @dfn{InReference}) has been added (@pxref{Web Searches}). @item Groups inside topics can now be sorted using the standard sorting functions, and each topic can be sorted independently (@pxref{Topic Sorting}). @item Subsets of the groups can be sorted independently (@code{Sorting Groups}). @item Cached articles can be pulled into the groups (@pxref{Summary Generation Commands}). @iftex @iflatex \marginpar[\mbox{}\hfill\epsfig{figure=ps/fred,width=3cm}]{\epsfig{figure=ps/fred,width=3cm}} @end iflatex @end iftex @item Score files are now applied in a more reliable order (@pxref{Score Variables}). @item Reports on where mail messages end up can be generated (@pxref{Splitting Mail}). @item More hooks and functions have been added to remove junk from incoming mail before saving the mail (@pxref{Washing Mail}). @item Emphasized text can be properly fontisized: @end itemize @node Quassia Gnus @subsubsection Quassia Gnus New features in Gnus 5.6: @itemize @bullet @item New functionality for using Gnus as an offline newsreader has been added. A plethora of new commands and modes have been added. @xref{Gnus Unplugged}, for the full story. @item The @code{nndraft} back end has returned, but works differently than before. All Message buffers are now also articles in the @code{nndraft} group, which is created automatically. @item @code{gnus-alter-header-function} can now be used to alter header values. @item @code{gnus-summary-goto-article} now accept Message-ID's. @item A new Message command for deleting text in the body of a message outside the region: @kbd{C-c C-v}. @item You can now post to component group in @code{nnvirtual} groups with @kbd{C-u C-c C-c}. @item @code{nntp-rlogin-program}---new variable to ease customization. @item @code{C-u C-c C-c} in @code{gnus-article-edit-mode} will now inhibit re-highlighting of the article buffer. @item New element in @code{gnus-boring-article-headers}---@code{long-to}. @item @kbd{M-i} symbolic prefix command. @xref{Symbolic Prefixes}, for details. @item @kbd{L} and @kbd{I} in the summary buffer now take the symbolic prefix @kbd{a} to add the score rule to the @file{all.SCORE} file. @item @code{gnus-simplify-subject-functions} variable to allow greater control over simplification. @item @kbd{A T}---new command for fetching the current thread. @item @kbd{/ T}---new command for including the current thread in the limit. @item @kbd{M-RET} is a new Message command for breaking cited text. @item @samp{\\1}-expressions are now valid in @code{nnmail-split-methods}. @item The @code{custom-face-lookup} function has been removed. If you used this function in your initialization files, you must rewrite them to use @code{face-spec-set} instead. @item Canceling now uses the current select method. Symbolic prefix @kbd{a} forces normal posting method. @item New command to translate M******** sm*rtq**t*s into proper text---@kbd{W d}. @item For easier debugging of @code{nntp}, you can set @code{nntp-record-commands} to a non-@code{nil} value. @item @code{nntp} now uses @file{~/.authinfo}, a @file{.netrc}-like file, for controlling where and how to send @sc{authinfo} to @acronym{NNTP} servers. @item A command for editing group parameters from the summary buffer has been added. @item A history of where mails have been split is available. @item A new article date command has been added---@code{article-date-iso8601}. @item Subjects can be simplified when threading by setting @code{gnus-score-thread-simplify}. @item A new function for citing in Message has been added---@code{message-cite-original-without-signature}. @item @code{article-strip-all-blank-lines}---new article command. @item A new Message command to kill to the end of the article has been added. @item A minimum adaptive score can be specified by using the @code{gnus-adaptive-word-minimum} variable. @item The lapsed date'' article header can be kept continually updated by the @code{gnus-start-date-timer} command. @item Web listserv archives can be read with the @code{nnlistserv} back end. @item Old dejanews archives can now be read by @code{nnweb}. @end itemize @node Pterodactyl Gnus @subsubsection Pterodactyl Gnus New features in Gnus 5.8: @itemize @bullet @item The mail-fetching functions have changed. See the manual for the many details. In particular, all procmail fetching variables are gone. If you used procmail like in @lisp (setq nnmail-use-procmail t) (setq nnmail-spool-file 'procmail) (setq nnmail-procmail-directory "~/mail/incoming/") (setq nnmail-procmail-suffix "\\.in") @end lisp this now has changed to @lisp (setq mail-sources '((directory :path "~/mail/incoming/" :suffix ".in"))) @end lisp @xref{Mail Source Specifiers}. @item Gnus is now a @acronym{MIME}-capable reader. This affects many parts of Gnus, and adds a slew of new commands. See the manual for details. @item Gnus has also been multilingualized. This also affects too many parts of Gnus to summarize here, and adds many new variables. @item @code{gnus-auto-select-first} can now be a function to be called to position point. @item The user can now decide which extra headers should be included in summary buffers and @acronym{NOV} files. @item @code{gnus-article-display-hook} has been removed. Instead, a number of variables starting with @code{gnus-treat-} have been added. @item The Gnus posting styles have been redone again and now works in a subtly different manner. @item New web-based back ends have been added: @code{nnslashdot}, @code{nnwarchive} and @code{nnultimate}. nnweb has been revamped, again, to keep up with ever-changing layouts. @item Gnus can now read @acronym{IMAP} mail via @code{nnimap}. @end itemize @node Oort Gnus @subsubsection Oort Gnus @cindex Oort Gnus New features in Gnus 5.10: @itemize @bullet @item Installation changes @c *********************** @itemize @bullet @item Upgrading from previous (stable) version if you have used Oort. If you have tried Oort (the unstable Gnus branch leading to this release) but went back to a stable version, be careful when upgrading to this version. In particular, you will probably want to remove all @file{.marks} (nnml) and @file{.mrk} (nnfolder) files, so that flags are read from your @file{.newsrc.eld} instead of from the @file{.marks}/@file{.mrk} file where this release store flags. See a later entry for more information about marks. Note that downgrading isn't save in general. @item Lisp files are now installed in @file{.../site-lisp/gnus/} by default. It defaulted to @file{.../site-lisp/} formerly. In addition to this, the new installer issues a warning if other Gnus installations which will shadow the latest one are detected. You can then remove those shadows manually or remove them using @code{make remove-installed-shadows}. @item New @file{make.bat} for compiling and installing Gnus under MS Windows Use @file{make.bat} if you want to install Gnus under MS Windows, the first argument to the batch-program should be the directory where @file{xemacs.exe} respectively @file{emacs.exe} is located, iff you want to install Gnus after compiling it, give @file{make.bat} @code{/copy} as the second parameter. @file{make.bat} has been rewritten from scratch, it now features automatic recognition of XEmacs and GNU Emacs, generates @file{gnus-load.el}, checks if errors occur while compilation and generation of info files and reports them at the end of the build process. It now uses @code{makeinfo} if it is available and falls back to @file{infohack.el} otherwise. @file{make.bat} should now install all files which are necessary to run Gnus and be generally a complete replacement for the @code{configure; make; make install} cycle used under Unix systems. The new @file{make.bat} makes @file{make-x.bat} and @file{xemacs.mak} superfluous, so they have been removed. @item @file{~/News/overview/} not used. As a result of the following change, the @file{~/News/overview/} directory is not used any more. You can safely delete the entire hierarchy. @c FIXME: gnus-load' is mentioned in README, which is not included in @c CVS. We should find a better place for this item. @item @code{(require 'gnus-load)} If you use a stand-alone Gnus distribution, you'd better add @code{(require 'gnus-load)} into your @file{~/.emacs} after adding the Gnus lisp directory into load-path. File @file{gnus-load.el} contains autoload commands, functions and variables, some of which may not be included in distributions of Emacsen. @end itemize @item New packages and libraries within Gnus @c ***************************************** @itemize @bullet @item The revised Gnus @acronym{FAQ} is included in the manual, @xref{Frequently Asked Questions}. @item @acronym{TLS} wrapper shipped with Gnus @acronym{TLS}/@acronym{SSL} is now supported in @acronym{IMAP} and @acronym{NNTP} via @file{tls.el} and GNUTLS. The old @acronym{TLS}/@acronym{SSL} support via (external third party) @file{ssl.el} and OpenSSL still works. @item Improved anti-spam features. Gnus is now able to take out spam from your mail and news streams using a wide variety of programs and filter rules. Among the supported methods are RBL blocklists, bogofilter and white/blacklists. Hooks for easy use of external packages such as SpamAssassin and Hashcash are also new. @xref{Thwarting Email Spam}. @c FIXME: @xref{Spam Package}?. Should this be under Misc? @item Gnus supports server-side mail filtering using Sieve. Sieve rules can be added as Group Parameters for groups, and the complete Sieve script is generated using @kbd{D g} from the Group buffer, and then uploaded to the server using @kbd{C-c C-l} in the generated Sieve buffer. @xref{Sieve Commands}, and the new Sieve manual @ref{Top, , Top, sieve, Emacs Sieve}. @end itemize @item Changes in group mode @c ************************ @itemize @bullet @item @code{gnus-group-read-ephemeral-group} can be called interactively, using @kbd{G M}. @item Retrieval of charters and control messages There are new commands for fetching newsgroup charters (@kbd{H c}) and control messages (@kbd{H C}). @item The new variable @code{gnus-parameters} can be used to set group parameters. Earlier this was done only via @kbd{G p} (or @kbd{G c}), which stored the parameters in @file{~/.newsrc.eld}, but via this variable you can enjoy the powers of customize, and simplified backups since you set the variable in @file{~/.gnus.el} instead of @file{~/.newsrc.eld}. The variable maps regular expressions matching group names to group parameters, a'la: @lisp (setq gnus-parameters '(("mail\\..*" (gnus-show-threads nil) (gnus-use-scoring nil)) ("^nnimap:\$$foo.bar\$$$"
(to-group . "\\1"))))
@end lisp

@item
Unread count correct in nnimap groups.

The estimated number of unread articles in the group buffer should now
be correct for nnimap groups.  This is achieved by calling
@code{gnus-setup-news-hook} (called on startup) and
@code{gnus-after-getting-new-news-hook}. (called after getting new
mail).  If you have modified those variables from the default, you may
you were happy with the estimate and want to save some (minimal) time
when getting new mail, remove the function.

@item
Group names are treated as UTF-8 by default.

This is supposedly what USEFOR wanted to migrate to.  See
@code{gnus-group-name-charset-group-alist} and
@code{gnus-group-name-charset-method-alist} for customization.

@item
@code{gnus-group-charset-alist} and
@code{gnus-group-ignored-charsets-alist}.

The regexps in these variables are compared with full group names
instead of real group names in 5.8.  Users who customize these
variables should change those regexps accordingly.  For example:
@lisp
("^han\\>" euc-kr) -> ("\$$^\\|:\$$han\\>" euc-kr)
@end lisp

@end itemize

@item Changes in summary and article mode
@c **************************************

@itemize @bullet

@item
@kbd{F} (@code{gnus-article-followup-with-original}) and @kbd{R}
(@code{gnus-article-reply-with-original}) only yank the text in the
region if the region is active.

@item
In draft groups, @kbd{e} is now bound to @code{gnus-draft-edit-message}.
Use @kbd{B w} for @code{gnus-summary-edit-article} instead.

@item
Article Buttons

pages and Emacs or Gnus related references.  @xref{Article Buttons}.  The
variables @code{gnus-button-@var{*}-level} can be used to control the
appearance of all article buttons.  @xref{Article Button Levels}.

@item
Single-part yenc encoded attachments can be decoded.

@item
Picons

The picons code has been reimplemented to work in GNU Emacs---some of
the previous options have been removed or renamed.

Picons are small personal icons'' representing users, domain and
newsgroups, which can be displayed in the Article buffer.
@xref{Picons}.

@item
If the new option @code{gnus-treat-body-boundary} is non-@code{nil}, a
boundary line is drawn at the end of the headers.

@item
Signed article headers (X-PGP-Sig) can be verified with @kbd{W p}.

@item
The Summary Buffer uses an arrow in the fringe to indicate the current
article.  Use @code{(setq gnus-summary-display-arrow nil)} to disable it.

@item
Warn about email replies to news

Do you often find yourself replying to news by email by mistake?  Then
the new option @code{gnus-confirm-mail-reply-to-news} is just the thing for
you.

@item
If the new option @code{gnus-summary-display-while-building} is
non-@code{nil}, the summary buffer is shown and updated as it's being
built.

@item
The new @code{recent} mark @samp{.} indicates newly arrived messages (as
opposed to old but unread messages).

@item
Gnus supports RFC 2369 mailing list headers, and adds a number of
related commands in mailing list groups.  @xref{Mailing List}.

@item
The Date header can be displayed in a format that can be read aloud
in English.  @xref{Article Date}.

@item
diffs are automatically highlighted in groups matching
@code{mm-uu-diff-groups-regexp}

@item
Better handling of Microsoft citation styles

Gnus now tries to recognize the mangled header block that some Microsoft
mailers use to indicate that the rest of the message is a citation, even
though it is not quoted in any way.  The variable
@code{gnus-cite-unsightly-citation-regexp} matches the start of these
citations.

The new command @kbd{W Y f}
(@code{gnus-article-outlook-deuglify-article}) allows deuglifying broken
Outlook (Express) articles.

@item
@code{gnus-article-skip-boring}

If you set @code{gnus-article-skip-boring} to @code{t}, then Gnus will
not scroll down to show you a page that contains only boring text,
which by default means cited text and signature.  You can customize
what is skippable using @code{gnus-article-boring-faces}.

This feature is especially useful if you read many articles that
consist of a little new content at the top with a long, untrimmed
message cited below.

@item
Smileys (@samp{:-)}, @samp{;-)} etc) are now displayed graphically in
Emacs too.

Put @code{(setq gnus-treat-display-smileys nil)} in @file{~/.gnus.el} to
disable it.

@item

@item
In the summary buffer, the new command @kbd{/ N} inserts new messages
and @kbd{/ o} inserts old messages.

@item
Gnus decodes morse encoded messages if you press @kbd{W m}.

@item
@code{gnus-summary-line-format}

The default value changed to @samp{%U%R%z%I%(%[%4L: %-23,23f%]%)
changed their default so that the users name will be replaced by the
recipient's name or the group name posting to for @acronym{NNTP}
groups.

@item
Deleting of attachments.

The command @code{gnus-mime-save-part-and-strip} (bound to @kbd{C-o}
on @acronym{MIME} buttons) saves a part and replaces the part with an
external one.  @code{gnus-mime-delete-part} (bound to @kbd{d} on
@acronym{MIME} buttons) removes a part.  It works only on back ends
that support editing.

@item
@code{gnus-default-charset}

The default value is determined from the
@code{iso-8859-1}.  Also the @samp{.*} item in
@code{gnus-group-charset-alist} is removed.

@item
Printing capabilities are enhanced.

Gnus supports Muttprint natively with @kbd{O P} from the Summary and
Article buffers.  Also, each individual @acronym{MIME} part can be
printed using @kbd{p} on the @acronym{MIME} button.

@item
Extended format specs.

Format spec @samp{%&user-date;} is added into
@code{gnus-summary-line-format-alist}.  Also, user defined extended
format specs are supported.  The extended format specs look like
@samp{%u&foo;}, which invokes function
@code{gnus-user-format-function-@var{foo}}.  Because @samp{&} is used as the
escape character, old user defined format @samp{%u&} is no longer supported.

@item
@kbd{/ *} (@code{gnus-summary-limit-include-cached}) is rewritten.

It was aliased to @kbd{Y c}
(@code{gnus-summary-insert-cached-articles}).  The new function filters
out other articles.

@item
Some limiting commands accept a @kbd{C-u} prefix to negate the match.

If @kbd{C-u} is used on subject, author or extra headers, i.e., @kbd{/
s}, @kbd{/ a}, and @kbd{/ x}
(@code{gnus-summary-limit-to-@{subject,author,extra@}}) respectively, the
result will be to display all articles that do not match the expression.

@item
Gnus inlines external parts (message/external).

@end itemize

@item Changes in Message mode and related Gnus features
@c ****************************************************

@itemize @bullet

@item
Delayed articles

You can delay the sending of a message with @kbd{C-c C-j} in the Message
buffer.  The messages are delivered at specified time.  This is useful
for sending yourself reminders.  @xref{Delayed Articles}.

@item
If the new option @code{nnml-use-compressed-files} is non-@code{nil},
the nnml back end allows compressed message files.

@item
The new option @code{gnus-gcc-mark-as-read} automatically marks

@item
Externalizing of attachments

If @code{gnus-gcc-externalize-attachments} or
@code{message-fcc-externalize-attachments} is non-@code{nil}, attach
local files as external parts.

@item
The envelope sender address can be customized when using Sendmail.
@xref{Mail Variables, Mail Variables,, message, Message Manual}.

@item
Gnus no longer generate the Sender: header automatically.

Earlier it was generated iff the user configurable email address was
different from the Gnus guessed default user address.  As the guessing
algorithm is rarely correct these days, and (more controversially) the
only use of the Sender: header was to check if you are entitled to
cancel/supersede news (which is now solved by Cancel Locks instead,
see another entry), generation of the header has been disabled by

@item
Features from third party @file{message-utils.el} added to @file{message.el}.

Message now asks if you wish to remove @samp{(was: <old subject>)} from
subject lines (see @code{message-subject-trailing-was-query}).  @kbd{C-c
M-m} and @kbd{C-c M-f} inserts markers indicating included text.
appropriate headers and a note in the body for cross-postings and
followups (see the variables @code{message-cross-post-@var{*}}).

@item
References and X-Draft-From headers are no longer generated when you
start composing messages and @code{message-generate-headers-first} is
@code{nil}.

@item
Easy inclusion of X-Faces headers.  @xref{X-Face}.

@item
Group Carbon Copy (GCC) quoting

To support groups that contains SPC and other weird characters, groups
are quoted before they are placed in the Gcc: header.  This means
variables such as @code{gnus-message-archive-group} should no longer
contain quote characters to make groups containing SPC work.  Also, if
you are using the string @samp{nnml:foo, nnml:bar} (indicating Gcc
into two groups) you must change it to return the list
@code{("nnml:foo" "nnml:bar")}, otherwise the Gcc: line will be quoted
incorrectly.  Note that returning the string @samp{nnml:foo, nnml:bar}
was incorrect earlier, it just didn't generate any problems since it
was inserted directly.

@item
@code{message-insinuate-rmail}

mail-user-agent 'gnus-user-agent)} in @file{.emacs} convinces Rmail to
compose, reply and forward messages in message-mode, where you can
enjoy the power of @acronym{MML}.

@item
@code{message-minibuffer-local-map}

The line below enables BBDB in resending a message:
@lisp
(define-key message-minibuffer-local-map [(tab)]
'bbdb-complete-name)
@end lisp

@item
@code{gnus-posting-styles}

Add a new format of match like
@lisp
(Organization "Somewhere, Inc."))
@end lisp
The old format like the lines below is obsolete, but still accepted.
@lisp
(Organization "Somewhere, Inc."))
@end lisp

@item

@samp{X-Draft-From} and @samp{X-Gnus-Agent-Meta-Information} have been
added into these two variables.  If you customized those, perhaps you

@item
Gnus supports the format=flowed'' (RFC 2646) parameter.  On
composing messages, it is enabled by @code{use-hard-newlines}.
Decoding format=flowed was present but not documented in earlier
versions.

@item
The option @code{mm-fill-flowed} can be used to disable treatment of
format=flowed'' messages.  Also, flowed text is disabled when sending
inline PGP signed messages.  @xref{Flowed text, , Flowed text,
emacs-mime, The Emacs MIME Manual}.  (New in Gnus 5.10.7)
@c This entry is also present in the node "No Gnus".

@item
Gnus supports the generation of RFC 2298 Disposition Notification requests.

This is invoked with the @kbd{C-c M-n} key binding from message mode.

@item
Message supports the Importance: (RFC 2156) header.

In the message buffer, @kbd{C-c C-f C-i} or @kbd{C-c C-u} cycles through
the valid values.

@item
Gnus supports Cancel Locks in News.

This means a header @samp{Cancel-Lock} is inserted in news posting.  It is
used to determine if you wrote an article or not (for canceling and
superseding).  Gnus generates a random password string the first time
you post a message, and saves it in your @file{~/.emacs} using the Custom
system.  While the variable is called @code{canlock-password}, it is not
security sensitive data.  Publishing your canlock string on the web
will not allow anyone to be able to anything she could not already do.
The behavior can be changed by customizing @code{message-insert-canlock}.

@item
Gnus supports @acronym{PGP} (RFC 1991/2440), @acronym{PGP/MIME} (RFC
2015/3156) and @acronym{S/MIME} (RFC 2630-2633).

It needs an external @acronym{S/MIME} and OpenPGP implementation, but no
Attachments menu, and @kbd{C-c RET} key bindings, when composing
messages.  This also obsoletes @code{gnus-article-hide-pgp-hook}.

@item
@acronym{MML} (Mime compose) prefix changed from @kbd{M-m} to @kbd{C-c
C-m}.

This change was made to avoid conflict with the standard binding of
@code{back-to-indentation}, which is also useful in message mode.

@item
The default for @code{message-forward-show-mml} changed to the symbol
@code{best}.

The behavior for the @code{best} value is to show @acronym{MML} (i.e.,
convert to @acronym{MIME}) when appropriate.  @acronym{MML} will not be
used when forwarding signed or encrypted messages, as the conversion
invalidate the digital signature.

@item
If @code{auto-compression-mode} is enabled, attachments are automatically
decompressed when activated.
@c FIXME: Does this affect article or message mode?

@item
Support for non-@acronym{ASCII} domain names

Message supports non-@acronym{ASCII} domain names in From:, To: and
Cc: and will query you whether to perform encoding when you try to
send a message.  The variable @code{message-use-idna} controls this.
Gnus will also decode non-@acronym{ASCII} domain names in From:, To:
and Cc: when you view a message.  The variable @code{gnus-use-idna}
controls this.

@item You can now drag and drop attachments to the Message buffer.
See @code{mml-dnd-protocol-alist} and @code{mml-dnd-attach-options}.
@xref{MIME, ,MIME, message, Message Manual}.
@c New in 5.10.9 / 5.11

@end itemize

@item Changes in back ends
@c ***********************

@itemize @bullet
@item

@item
The nndoc back end now supports mailman digests and exim bounces.

@item
Gnus supports Maildir groups.

Gnus includes a new back end @file{nnmaildir.el}.  @xref{Maildir}.

@item
The nnml and nnfolder back ends store marks for each groups.

This makes it possible to take backup of nnml/nnfolder servers/groups
separately of @file{~/.newsrc.eld}, while preserving marks.  It also
makes it possible to share articles and marks between users (without
sharing the @file{~/.newsrc.eld} file) within e.g. a department.  It
works by storing the marks stored in @file{~/.newsrc.eld} in a per-group
file @file{.marks} (for nnml) and @file{@var{groupname}.mrk} (for
nnfolder, named @var{groupname}).  If the nnml/nnfolder is moved to
another machine, Gnus will automatically use the @file{.marks} or
@file{.mrk} file instead of the information in @file{~/.newsrc.eld}.
The new server variables @code{nnml-marks-is-evil} and
@code{nnfolder-marks-is-evil} can be used to disable this feature.

@end itemize

@item Appearance
@c *************

@itemize @bullet

@item
The menu bar item (in Group and Summary buffer) named Misc'' has
been renamed to Gnus''.

@item
The menu bar item (in Message mode) named @acronym{MML}'' has been
renamed to Attachments''.  Note that this menu also contains security
related stuff, like signing and encryption (@pxref{Security, Security,,
message, Message Manual}).

@item
The tool bars have been updated to use GNOME icons in Group, Summary and
Message mode.  You can also customize the tool bars.  This is a new
feature in Gnus 5.10.9.  (Only for Emacs, not in XEmacs.)

@item The tool bar icons are now (de)activated correctly
in the group buffer, see the variable @code{gnus-group-update-tool-bar}.
Its default value depends on your Emacs version.  This is a new feature
in Gnus 5.10.9.
@end itemize

@item Miscellaneous changes
@c ************************

@itemize @bullet

@item
@code{gnus-agent}

The Gnus Agent has seen a major updated and is now enabled by default,
and all nntp and nnimap servers from @code{gnus-select-method} and
@code{gnus-secondary-select-method} are agentized by default.  Earlier
only the server in @code{gnus-select-method} was agentized by the
default, and the agent was disabled by default.  When the agent is
of the back ends when possible.  Earlier this only happened in the
unplugged state.  You can enroll or remove servers with @kbd{J a} and
@kbd{J r} in the server buffer.  Gnus will not download articles into
the Agent cache, unless you instruct it to do so, though, by using
@kbd{J u} or @kbd{J s} from the Group buffer.  You revert to the old
behavior of having the Agent disabled with @code{(setq gnus-agent
nil)}.  Note that putting @code{(gnus-agentize)} in @file{~/.gnus.el}
is not needed any more.

@item
Gnus reads the @acronym{NOV} and articles in the Agent if plugged.

If one reads an article while plugged, and the article already exists
gnus-agent-cache nil)} reverts to the old behavior.

@item
Dired integration

@code{gnus-dired-minor-mode} (see @ref{Other modes}) installs key
bindings in dired buffers to send a file as an attachment, open a file
using the appropriate mailcap entry, and print a file using the mailcap
entry.

@item
The format spec @code{%C} for positioning point has changed to @code{%*}.

@item
@code{gnus-slave-unplugged}

A new command which starts Gnus offline in slave mode.

@end itemize

@end itemize

@iftex

@page
@node The Manual
@section The Manual
@cindex colophon
@cindex manual

This manual was generated from a TeXinfo file and then run through
either @code{texi2dvi}
@iflatex
or my own home-brewed TeXinfo to \LaTeX\ transformer,
and then run through @code{latex} and @code{dvips}
@end iflatex
to get what you hold in your hands now.

The following conventions have been used:

@enumerate

@item
This is a @samp{string}

@item
This is a @kbd{keystroke}

@item
This is a @file{file}

@item
This is a @code{symbol}

@end enumerate

So if I were to say set @code{flargnoze} to @samp{yes}'', that would
mean:

@lisp
(setq flargnoze "yes")
@end lisp

If I say set @code{flumphel} to @code{yes}'', that would mean:

@lisp
(setq flumphel 'yes)
@end lisp

@samp{yes} and @code{yes} are two @emph{very} different things---don't
ever get them confused.

@iflatex
Of course, everything in this manual is of vital interest, so you should
read it all.  Several times.  However, if you feel like skimming the
manual, look for that gnu head you should see in the margin over
there---it means that what's being discussed is of more importance than
the rest of the stuff.  (On the other hand, if everything is infinitely
important, how can anything be more important than that?  Just one more
of the mysteries of this world, I guess.)
@end iflatex

@end iftex

@node On Writing Manuals
@section On Writing Manuals

I guess most manuals are written after-the-fact; documenting a program
that's already there.  This is not how this manual is written.  When
implementing something, I write the manual entry for that something
straight away.  I then see that it's difficult to explain the
functionality, so I write how it's supposed to be, and then I change the
implementation.  Writing the documentation and writing the code goes
hand in hand.

This, of course, means that this manual has no, or little, flow.  It
documents absolutely everything in Gnus, but often not where you're
looking for it.  It is a reference manual, and not a guide to how to get
started with Gnus.

That would be a totally different book, that should be written using the
reference manual as source material.  It would look quite differently.

@page
@node Terminology
@section Terminology

@cindex terminology
@table @dfn

@item news
@cindex news
This is what you are supposed to use this thing for---reading news.
News is generally fetched from a nearby @acronym{NNTP} server, and is
generally publicly available to everybody.  If you post news, the entire
world is likely to read just what you have written, and they'll all

@item mail
@cindex mail
Everything that's delivered to you personally is mail.  Some news/mail
readers (like Gnus) blur the distinction between mail and news, but
there is a difference.  Mail is private.  News is public.  Mailing is
not posting, and replying is not following up.

Send a mail to the person who has written what you are reading.

Post an article to the current newsgroup responding to the article you

@item back end
@cindex back end
Gnus considers mail and news to be mostly the same, really.  The only
difference is how to access the actual articles.  News articles are
commonly fetched via the protocol @acronym{NNTP}, whereas mail
messages could be read from a file on the local disk.  The internal
architecture of Gnus thus comprises a front end'' and a number of
back ends''.  Internally, when you enter a group (by hitting
@key{RET}, say), you thereby invoke a function in the front end in
Gnus.  The front end then talks'' to a back end and says things like
Give me the list of articles in the foo group'' or Show me article
number 4711''.

So a back end mainly defines either a protocol (the @code{nntp} back
end accesses news via @acronym{NNTP}, the @code{nnimap} back end
accesses mail via @acronym{IMAP}) or a file format and directory
layout (the @code{nnspool} back end accesses news via the common
spool directory'' format, the @code{nnml} back end access mail via a
file format and directory layout that's quite similar).

Gnus does not handle the underlying media, so to speak---this is all
done by the back ends.  A back end is a collection of functions to
access the articles.

However, sometimes the term back end'' is also used where server''
would have been more appropriate.  And then there is the term select
method'' which can mean either.  The Gnus terminology can be quite
confusing.

@item native
@cindex native
Gnus will always use one method (and back end) as the @dfn{native}, or
default, way of getting news.

@item foreign
@cindex foreign
You can also have any number of foreign groups active at the same time.
These are groups that use non-native non-secondary back ends for getting
news.

@item secondary
@cindex secondary
Secondary back ends are somewhere half-way between being native and being
foreign, but they mostly act like they are native.

@item article
@cindex article
A message that has been posted as news.

@item mail message
@cindex mail message
A message that has been mailed.

@item message
@cindex message
A mail message or news article

The top part of a message, where administrative information (etc.) is
put.

@item body
@cindex body
The rest of an article.  Everything not in the head is in the
body.

A line from the head of an article.

A collection of such lines, or a collection of heads.  Or even a
collection of @acronym{NOV} lines.

@item @acronym{NOV}
@cindex @acronym{NOV}
When Gnus enters a group, it asks the back end for the headers of all
unread articles in the group.  Most servers support the News OverView
format, which is more compact and much faster to read and parse than the

@item level
@cindex levels
Each group is subscribed at some @dfn{level} or other (1-9).  The ones
that have a lower level are more'' subscribed than the groups with a
higher level.  In fact, groups on levels 1-5 are considered
@dfn{subscribed}; 6-7 are @dfn{unsubscribed}; 8 are @dfn{zombies}; and 9
are @dfn{killed}.  Commands for listing groups and scanning for new
articles will all use the numeric prefix as @dfn{working level}.

@item killed groups
@cindex killed groups
No information on killed groups is stored or updated, which makes killed
groups much easier to handle than subscribed groups.

@item zombie groups
@cindex zombie groups
Just like killed groups, only slightly less dead.

@item active file
@cindex active file
The news server has to keep track of what articles it carries, and what
groups exist.  All this information in stored in the active file, which
is rather large, as you might surmise.

@item bogus groups
@cindex bogus groups
A group that exists in the @file{.newsrc} file, but isn't known to the
server (i.e.,  it isn't in the active file), is a @emph{bogus group}.
This means that the group probably doesn't exist (any more).

@item activating
@cindex activating groups
The act of asking the server for info on a group and computing the
number of unread articles is called @dfn{activating the group}.
Un-activated groups are listed with @samp{*} in the group buffer.

@item spool
@cindex spool
News servers store their articles locally in one fashion or other.
One old-fashioned storage method is to have just one file per
article.  That's called a traditional spool''.

@item server
@cindex server
A machine one can connect to and get news (or mail) from.

@item select method
@cindex select method
A structure that specifies the back end, the server and the virtual
server settings.

@item virtual server
@cindex virtual server
A named select method.  Since a select method defines all there is to
know about connecting to a (physical) server, taking the thing as a
whole is a virtual server.

@item washing
@cindex washing
Taking a buffer and running it through a filter of some sort.  The
result will (more often than not) be cleaner and more pleasing than the
original.

@item ephemeral groups
@cindex ephemeral groups
@cindex temporary groups
Most groups store data on what articles you have read.  @dfn{Ephemeral}
groups are groups that will have no data stored---when you exit the
group, it'll disappear into the aether.

@item solid groups
@cindex solid groups
This is the opposite of ephemeral groups.  All groups listed in the
group buffer are solid groups.

@item sparse articles
@cindex sparse articles
These are article placeholders shown in the summary buffer when

To put responses to articles directly after the articles they respond
to---in a hierarchical fashion.

@item root
@cindex root
The first article in a thread is the root.  It is the ancestor of all

@item parent
@cindex parent
An article that has responses.

@item child
@cindex child
An article that responds to a different article---its parent.

@item digest
@cindex digest
A collection of messages in one file.  The most common digest format is
specified by RFC 1153.

@item splitting
@cindex splitting, terminology
@cindex mail sorting
@cindex mail filtering (splitting)
The action of sorting your emails according to certain rules. Sometimes
incorrectly called mail filtering.

@end table

@page
@node Customization
@section Customization
@cindex general customization

All variables are properly documented elsewhere in this manual.  This
section is designed to give general pointers on how to customize Gnus
for some quite common situations.

* Slow/Expensive Connection::   You run a local Emacs and get the news elsewhere.
* Slow Terminal Connection::    You run a remote Emacs.
* Little Disk Space::           You feel that having large setup files is icky.
* Slow Machine::                You feel like buying a faster machine.

@node Slow/Expensive Connection
@subsection Slow/Expensive NNTP Connection

If you run Emacs on a machine locally, and get your news from a machine
over some very thin strings, you want to cut down on the amount of data
Gnus has to get from the @acronym{NNTP} server.

@table @code

Set this to @code{nil}, which will inhibit Gnus from requesting the
entire active file from the server.  This file is often very large.  You
also have to set @code{gnus-check-new-newsgroups} and
@code{gnus-check-bogus-newsgroups} to @code{nil} to make sure that Gnus
doesn't suddenly decide to fetch the active file anyway.

@item gnus-nov-is-evil
This one has to be @code{nil}.  If not, grabbing article headers from
the @acronym{NNTP} server will not be very fast.  Not all @acronym{NNTP} servers
support @sc{xover}; Gnus will detect this by itself.
@end table

@node Slow Terminal Connection
@subsection Slow Terminal Connection

Let's say you use your home computer for dialing up the system that runs
Emacs and Gnus.  If your modem is slow, you want to reduce (as much as
possible) the amount of data sent over the wires.

@table @code

@item gnus-auto-center-summary
Set this to @code{nil} to inhibit Gnus from re-centering the summary
buffer all the time.  If it is @code{vertical}, do only vertical
re-centering.  If it is neither @code{nil} nor @code{vertical}, do both
horizontal and vertical recentering.

Cut down on the headers included in the articles to the
minimum.  You can, in fact, make do without them altogether---most of the
useful data is in the summary buffer, anyway.  Set this variable to
@samp{^NEVVVVER} or @samp{From:}, or whatever you feel you need.

Use the following to enable all the available hiding features:
@lisp
gnus-treat-hide-signature t
gnus-treat-hide-citation t)
@end lisp

@item gnus-use-full-window
By setting this to @code{nil}, you can make all the windows smaller.
While this doesn't really cut down much generally, it means that you
have to see smaller portions of articles before deciding that you didn't

If this is non-@code{nil}, all threads in the summary buffer will be
hidden initially.

@item gnus-updated-mode-lines
If this is @code{nil}, Gnus will not put information in the buffer mode
lines, which might save some time.
@end table

@node Little Disk Space
@subsection Little Disk Space
@cindex disk space

The startup files can get rather large, so you may want to cut their
sizes a bit if you are running out of space.

@table @code

@item gnus-save-newsrc-file
If this is @code{nil}, Gnus will never save @file{.newsrc}---it will
only save @file{.newsrc.eld}.  This means that you will not be able to
use any other newsreaders than Gnus.  This variable is @code{t} by
default.

If this is @code{nil}, Gnus will never read @file{.newsrc}---it will
only read @file{.newsrc.eld}.  This means that you will not be able to
use any other newsreaders than Gnus.  This variable is @code{t} by
default.

@item gnus-save-killed-list
If this is @code{nil}, Gnus will not save the list of dead groups.  You
should also set @code{gnus-check-new-newsgroups} to @code{ask-server}
and @code{gnus-check-bogus-newsgroups} to @code{nil} if you set this
variable to @code{nil}.  This variable is @code{t} by default.

@end table

@node Slow Machine
@subsection Slow Machine
@cindex slow machine

If you have a slow machine, or are just really impatient, there are a
few things you can do to make Gnus run faster.

Set @code{gnus-check-new-newsgroups} and
@code{gnus-check-bogus-newsgroups} to @code{nil} to make startup faster.

@code{gnus-nov-is-evil} to @code{nil} to make entering and exiting the
summary buffer faster.

@page
@node Troubleshooting
@section Troubleshooting
@cindex troubleshooting

Gnus works @emph{so} well straight out of the box---I can't imagine any
problems, really.

Ahem.

@enumerate

@item
Make sure your computer is switched on.

@item
Make sure that you really load the current Gnus version.  If you have
been running @sc{gnus}, you need to exit Emacs and start it up again before
Gnus will work.

@item
Try doing an @kbd{M-x gnus-version}.  If you get something that looks
like @samp{Gnus v5.10.6} you have the right files loaded.  Otherwise
you have some old @file{.el} files lying around.  Delete these.

@item
Read the help group (@kbd{G h} in the group buffer) for a
@acronym{FAQ} and a how-to.

@item
@vindex max-lisp-eval-depth
Gnus works on many recursive structures, and in some extreme (and very
rare) cases Gnus may recurse down too deeply'' and Emacs will beep at
you.  If this happens to you, set @code{max-lisp-eval-depth} to 500 or
something like that.
@end enumerate

If all else fails, report the problem as a bug.

@cindex bugs
@cindex reporting bugs

@kindex M-x gnus-bug
@findex gnus-bug
If you find a bug in Gnus, you can report it with the @kbd{M-x gnus-bug}
command.  @kbd{M-x set-variable RET debug-on-error RET t RET}, and send
me the backtrace.  I will fix bugs, but I can only fix them if you send
me a precise description as to how to reproduce the bug.

You really can never be too detailed in a bug report.  Always use the
@kbd{M-x gnus-bug} command when you make bug reports, even if it creates
a 10Kb mail each time you use it, and even if you have sent me your
environment 500 times before.  I don't care.  I want the full info each
time.

It is also important to remember that I have no memory whatsoever.  If
you send a bug report, and I send you a reply, and then you just send
back No, it's not! Moron!'', I will have no idea what you are
insulting me about.  Always over-explain everything.  It's much easier
for all of us---if I don't have all the information I need, I will just

If the problem you're seeing is very visual, and you can't quite explain
it, copy the Emacs window to a file (with @code{xwd}, for instance), put
it somewhere it can be reached, and include the URL of the picture in
the bug report.

@cindex patches
If you would like to contribute a patch to fix bugs or make
improvements, please produce the patch using @samp{diff -u}.

@cindex edebug
If you want to debug your problem further before reporting, possibly
in order to solve the problem yourself and send a patch, you can use
edebug.  Debugging Lisp code is documented in the Elisp manual
(@pxref{Debugging, , Debugging Lisp Programs, elisp, The GNU Emacs
Lisp Reference Manual}).  To get you started with edebug, consider if
you discover some weird behavior when pressing @kbd{c}, the first
step is to do @kbd{C-h k c} and click on the hyperlink (Emacs only) in
the documentation buffer that leads you to the function definition,
then press @kbd{M-x edebug-defun RET} with point inside that function,
return to Gnus and press @kbd{c} to invoke the code.  You will be
placed in the lisp buffer and can single step using @kbd{SPC} and
evaluate expressions using @kbd{M-:} or inspect variables using
@kbd{C-h v}, abort execution with @kbd{q}, and resume execution with
@kbd{c} or @kbd{g}.

@cindex elp
@cindex profile
@cindex slow
Sometimes, a problem do not directly generate an elisp error but
manifests itself by causing Gnus to be very slow.  In these cases, you
can use @kbd{M-x toggle-debug-on-quit} and press @kbd{C-g} when things are
slow, and then try to analyze the backtrace (repeating the procedure
helps isolating the real problem areas).

A fancier approach is to use the elisp profiler, ELP.  The profiler is
(or should be) fully documented elsewhere, but to get you started
there are a few steps that need to be followed.  First, instrument the
part of Gnus you are interested in for profiling, e.g. @kbd{M-x
elp-instrument-package RET gnus} or @kbd{M-x elp-instrument-package
RET message}.  Then perform the operation that is slow and press
@kbd{M-x elp-results}.  You will then see which operations that takes
time, and can debug them further.  If the entire operation takes much
longer than the time spent in the slowest function in the profiler
output, you probably profiled the wrong part of Gnus.  To reset
profiling statistics, use @kbd{M-x elp-reset-all}.  @kbd{M-x
elp-restore-all} is supposed to remove profiling, but given the
complexities and dynamic code generation in Gnus, it might not always
work perfectly.

@cindex gnu.emacs.gnus
@cindex ding mailing list
If you just need help, you are better off asking on
@email{ding@@gnus.org, the ding mailing list}.  Write to
@email{ding-request@@gnus.org} to subscribe.

@page
@node Gnus Reference Guide
@section Gnus Reference Guide

It is my hope that other people will figure out smart stuff that Gnus
can do, and that other people will write those smart things as well.  To
facilitate that I thought it would be a good idea to describe the inner
workings of Gnus.  And some of the not-so-inner workings, while I'm at
it.

You can never expect the internals of a program not to change, but I
will be defining (in some details) the interface between Gnus and its
back ends (this is written in stone), the format of the score files
(ditto), data structures (some are less likely to change than others)
and general methods of operation.

* Gnus Utility Functions::      Common functions and variable to use.
* Back End Interface::          How Gnus communicates with the servers.
* Score File Syntax::           A BNF definition of the score file standard.
* Ranges::                      A handy format for storing mucho numbers.
* Group Info::                  The group info format.
* Extended Interactive::        Symbolic prefixes and stuff.
* Emacs/XEmacs Code::           Gnus can be run under all modern Emacsen.
* Various File Formats::        Formats of files that Gnus use.

@node Gnus Utility Functions
@subsection Gnus Utility Functions
@cindex Gnus utility functions
@cindex utility functions
@cindex functions
@cindex internal variables

When writing small functions to be run from hooks (and stuff), it's
Below is a list of the most common ones.

@table @code

@item gnus-newsgroup-name
@vindex gnus-newsgroup-name
This variable holds the name of the current newsgroup.

@item gnus-find-method-for-group
@findex gnus-find-method-for-group
A function that returns the select method for @var{group}.

@item gnus-group-real-name
@findex gnus-group-real-name
Takes a full (prefixed) Gnus group name, and returns the unprefixed
name.

@item gnus-group-prefixed-name
@findex gnus-group-prefixed-name
Takes an unprefixed group name and a select method, and returns the full
(prefixed) Gnus group name.

@item gnus-get-info
@findex gnus-get-info
Returns the group info list for @var{group}.

The number of unread articles in @var{group}, or @code{t} if that is
unknown.

@item gnus-active
@findex gnus-active
The active entry for @var{group}.

@item gnus-set-active
@findex gnus-set-active
Set the active entry for @var{group}.

Adds the current buffer to the list of buffers to be killed on Gnus
exit.

@item gnus-continuum-version
@findex gnus-continuum-version
Takes a Gnus version string as a parameter and returns a floating point
number.  Earlier versions will always get a lower number than later
versions.

Says whether @var{group} is read-only or not.

@item gnus-news-group-p
@findex gnus-news-group-p
Says whether @var{group} came from a news back end.

@item gnus-ephemeral-group-p
@findex gnus-ephemeral-group-p
Says whether @var{group} is ephemeral or not.

@item gnus-server-to-method
@findex gnus-server-to-method
Returns the select method corresponding to @var{server}.

@item gnus-server-equal
@findex gnus-server-equal
Says whether two virtual servers are equal.

@item gnus-group-native-p
@findex gnus-group-native-p
Says whether @var{group} is native or not.

@item gnus-group-secondary-p
@findex gnus-group-secondary-p
Says whether @var{group} is secondary or not.

@item gnus-group-foreign-p
@findex gnus-group-foreign-p
Says whether @var{group} is foreign or not.

@item gnus-group-find-parameter
@findex gnus-group-find-parameter
Returns the parameter list of @var{group}.  If given a second parameter,
returns the value of that parameter for @var{group}.

@item gnus-group-set-parameter
@findex gnus-group-set-parameter
Takes three parameters; @var{group}, @var{parameter} and @var{value}.

@item gnus-narrow-to-body
@findex gnus-narrow-to-body
Narrows the current buffer to the body of the article.

@item gnus-check-backend-function
@findex gnus-check-backend-function
Takes two parameters, @var{function} and @var{group}.  If the back end
@var{group} comes from supports @var{function}, return non-@code{nil}.

@lisp
(gnus-check-backend-function "request-scan" "nnml:misc")
@result{} t
@end lisp

Prompts the user for a select method.

@end table

@node Back End Interface
@subsection Back End Interface

Gnus doesn't know anything about @acronym{NNTP}, spools, mail or virtual
groups.  It only knows how to talk to @dfn{virtual servers}.  A virtual
server is a @dfn{back end} and some @dfn{back end variables}.  As examples
of the first, we have @code{nntp}, @code{nnspool} and @code{nnmbox}.  As
examples of the latter we have @code{nntp-port-number} and
@code{nnmbox-directory}.

When Gnus asks for information from a back end---say @code{nntp}---on
something, it will normally include a virtual server name in the
function parameters.  (If not, the back end should use the current''
virtual server.)  For instance, @code{nntp-request-list} takes a virtual
server as its only (optional) parameter.  If this virtual server hasn't
been opened, the function should fail.

Note that a virtual server name has no relation to some physical server
name.  Take this example:

@lisp
(nntp "odd-one"
(nntp-port-number 4324))
@end lisp

Here the virtual server name is @samp{odd-one} while the name of
the physical server is @samp{ifi.uio.no}.

The back ends should be able to switch between several virtual servers.
The standard back ends implement this by keeping an alist of virtual
server environments that they pull down/push up when needed.

There are two groups of interface functions: @dfn{required functions},
which must be present, and @dfn{optional functions}, which Gnus will
always check for presence before attempting to call 'em.

All these functions are expected to return data in the buffer
@code{nntp-server-buffer} (@samp{ *nntpd*}), which is somewhat
unfortunately named, but we'll have to live with it.  When I talk about
@dfn{resulting data}, I always refer to the data in that buffer.  When I
talk about @dfn{return value}, I talk about the function value returned by
the function call.  Functions that fail should return @code{nil} as the
return value.

Some back ends could be said to be @dfn{server-forming} back ends, and
some might be said not to be.  The latter are back ends that generally
only operate on one group at a time, and have no concept of server''
---they have a group, and they deliver info on that group and nothing
more.

Gnus identifies each message by way of group name and article number.  A
few remarks about these article numbers might be useful.  First of all,
the numbers are positive integers.  Secondly, it is normally not
possible for later articles to re-use'' older article numbers without
confusing Gnus.  That is, if a group has ever contained a message
numbered 42, then no other message may get that number, or Gnus will get
mightily confused.@footnote{See the function
@code{nnchoke-request-update-info}, @ref{Optional Back End Functions}.}
Third, article numbers must be assigned in order of arrival in the
group; this is not necessarily the same as the date of the message.

The previous paragraph already mentions all the hard'' restrictions that
article numbers must fulfill.  But it seems that it might be useful to
assign @emph{consecutive} article numbers, for Gnus gets quite confused
if there are holes in the article numbering sequence.  However, due to
the no-reuse'' restriction, holes cannot be avoided altogether.  It's
also useful for the article numbers to start at 1 to avoid running out
of numbers as long as possible.

Note that by convention, back ends are named @code{nnsomething}, but
Gnus also comes with some @code{nnnotbackends}, such as

In the examples and definitions I will refer to the imaginary back end
@code{nnchoke}.

@cindex @code{nnchoke}

* Required Back End Functions::  Functions that must be implemented.
* Optional Back End Functions::  Functions that need not be implemented.
* Writing New Back Ends::       Extending old back ends.
* Hooking New Back Ends Into Gnus::  What has to be done on the Gnus end.
* Mail-like Back Ends::         Some tips on mail back ends.

@node Required Back End Functions
@subsubsection Required Back End Functions

@table @code

@item (nnchoke-retrieve-headers ARTICLES &optional GROUP SERVER FETCH-OLD)

@var{articles} is either a range of article numbers or a list of
@code{Message-ID}s.  Current back ends do not fully support either---only
sequences (lists) of article numbers, and most back ends do not support
retrieval of @code{Message-ID}s.  But they should try for both.

The result data should either be HEADs or @acronym{NOV} lines, and the result
value should either be @code{headers} or @code{nov} to reflect this.
This might later be expanded to @code{various}, which will be a mixture
of HEADs and @acronym{NOV} lines, but this is currently not supported by Gnus.

If @var{fetch-old} is non-@code{nil} it says to try fetching extra
headers'', in some meaning of the word.  This is generally done by
fetching (at most) @var{fetch-old} extra headers less than the smallest
article number in @code{articles}, and filling the gaps as well.  The
presence of this parameter can be ignored if the back end finds it
cumbersome to follow the request.  If this is non-@code{nil} and not a
number, do maximum fetches.

@example
221 1056 Article retrieved.
Path: ifi.uio.no!sturles
From: sturles@@ifi.uio.no (Sturle Sunde)
Newsgroups: ifi.discussion
Subject: Re: Something very droll
Date: 27 Oct 1994 14:02:57 +0100
Organization: Dept. of Informatics, University of Oslo, Norway
Lines: 26
Message-ID: <38o8e1$a0o@@holmenkollen.ifi.uio.no> References: <38jdmq$4qu@@visbur.ifi.uio.no>
NNTP-Posting-Host: holmenkollen.ifi.uio.no
.
@end example

So a @code{headers} return value would imply that there's a number of
these in the data buffer.

Here's a BNF definition of such a buffer:

@example
error-message  = [ "4" / "5" ] 2number " " <error message> eol
valid-message  = "221 " <number> " Article retrieved." eol
@end example

@cindex BNF
(The version of BNF used here is the one used in RFC822.)

If the return value is @code{nov}, the data buffer should contain
@dfn{network overview database} lines.  These are basically fields
separated by tabs.

@example
nov-buffer = *nov-line
nov-line   = field 7*8[ <TAB> field ] eol
field      = <text except TAB>
@end example

For a closer look at what should be in those fields,

@item (nnchoke-open-server SERVER &optional DEFINITIONS)

@var{server} is here the virtual server name.  @var{definitions} is a
list of @code{(VARIABLE VALUE)} pairs that define this virtual server.

If the server can't be opened, no error should be signaled.  The back end
may then choose to refuse further attempts at connecting to this
server.  In fact, it should do so.

If the server is opened already, this function should return a
non-@code{nil} value.  There should be no data returned.

@item (nnchoke-close-server &optional SERVER)

Close connection to @var{server} and free all resources connected
to it.  Return @code{nil} if the server couldn't be closed for some
reason.

There should be no data returned.

@item (nnchoke-request-close)

Close connection to all servers and free all resources that the back end
have reserved.  All buffers that have been created by that back end
should be killed.  (Not the @code{nntp-server-buffer}, though.)  This
function is generally only called when Gnus is shutting down.

There should be no data returned.

@item (nnchoke-server-opened &optional SERVER)

If @var{server} is the current virtual server, and the connection to the
physical server is alive, then this function should return a
non-@code{nil} value.  This function should under no circumstances
attempt to reconnect to a server we have lost connection to.

There should be no data returned.

@item (nnchoke-status-message &optional SERVER)

This function should return the last error message from @var{server}.

There should be no data returned.

@item (nnchoke-request-article ARTICLE &optional GROUP SERVER TO-BUFFER)

The result data from this function should be the article specified by
@var{article}.  This might either be a @code{Message-ID} or a number.
It is optional whether to implement retrieval by @code{Message-ID}, but
it would be nice if that were possible.

If @var{to-buffer} is non-@code{nil}, the result data should be returned
in this buffer instead of the normal data buffer.  This is to make it
possible to avoid copying large amounts of data from one buffer to
another, while Gnus mainly requests articles to be inserted directly
into its article buffer.

If it is at all possible, this function should return a cons cell where
the @code{car} is the group name the article was fetched from, and the @code{cdr} is
the article number.  This will enable Gnus to find out what the real
group and article numbers are when fetching articles by
@code{Message-ID}.  If this isn't possible, @code{t} should be returned
on successful article retrieval.

@item (nnchoke-request-group GROUP &optional SERVER FAST)

Get data on @var{group}.  This function also has the side effect of
making @var{group} the current group.

If @var{fast}, don't bother to return useful data, just make @var{group}
the current group.

Here's an example of some result data and a definition of the same:

@example
211 56 1000 1059 ifi.discussion
@end example

The first number is the status, which should be 211.  Next is the
total number of articles in the group, the lowest article number, the
highest article number, and finally the group name.  Note that the total
number of articles may be less than one might think while just
considering the highest and lowest article numbers, but some articles
may have been canceled.  Gnus just discards the total-number, so
whether one should take the bother to generate it properly (if that is a
problem) is left as an exercise to the reader.  If the group contains no
articles, the lowest article number should be reported as 1 and the
highest as 0.

@example
group-status = [ error / info ] eol
error        = [ "4" / "5" ] 2<number> " " <Error message>
info         = "211 " 3* [ <number> " " ] <string>
@end example

@item (nnchoke-close-group GROUP &optional SERVER)

Close @var{group} and free any resources connected to it.  This will be
a no-op on most back ends.

There should be no data returned.

@item (nnchoke-request-list &optional SERVER)

Return a list of all groups available on @var{server}.  And that means
@emph{all}.

Here's an example from a server that only carries two groups:

@example
ifi.test 0000002200 0000002000 y
ifi.discussion 3324 3300 n
@end example

On each line we have a group name, then the highest article number in
that group, the lowest article number, and finally a flag.  If the group
contains no articles, the lowest article number should be reported as 1
and the highest as 0.

@example
active-file = *active-line
active-line = name " " <number> " " <number> " " flags eol
name        = <string>
flags       = "n" / "y" / "m" / "x" / "j" / "=" name
@end example

The flag says whether the group is read-only (@samp{n}), is moderated
(@samp{m}), is dead (@samp{x}), is aliased to some other group
(@samp{=other-group}) or none of the above (@samp{y}).

@item (nnchoke-request-post &optional SERVER)

This function should post the current buffer.  It might return whether
the posting was successful or not, but that's not required.  If, for
instance, the posting is done asynchronously, it has generally not been
completed by the time this function concludes.  In that case, this
function should set up some kind of sentinel to beep the user loud and
clear if the posting could not be completed.

There should be no result data from this function.

@end table

@node Optional Back End Functions
@subsubsection Optional Back End Functions

@table @code

@item (nnchoke-retrieve-groups GROUPS &optional SERVER)

@var{groups} is a list of groups, and this function should request data
on all those groups.  How it does it is of no concern to Gnus, but it
should attempt to do this in a speedy fashion.

The return value of this function can be either @code{active} or
@code{group}, which says what the format of the result data is.  The
former is in the same format as the data from
@code{nnchoke-request-list}, while the latter is a buffer full of lines
in the same format as @code{nnchoke-request-group} gives.

@example
group-buffer = *active-line / *group-status
@end example

@item (nnchoke-request-update-info GROUP INFO &optional SERVER)

A Gnus group info (@pxref{Group Info}) is handed to the back end for
alterations.  This comes in handy if the back end really carries all
the information (as is the case with virtual and imap groups).  This
function should destructively alter the info to suit its needs, and
should return a non-@code{nil} value.

There should be no result data from this function.

@item (nnchoke-request-type GROUP &optional ARTICLE)

When the user issues commands for sending news'' (@kbd{F} in the
summary buffer, for instance), Gnus has to know whether the article the
user is following up on is news or mail.  This function should return
@code{news} if @var{article} in @var{group} is news, @code{mail} if it
is mail and @code{unknown} if the type can't be decided.  (The
@var{article} parameter is necessary in @code{nnvirtual} groups which
might very well combine mail groups and news groups.)  Both @var{group}
and @var{article} may be @code{nil}.

There should be no result data from this function.

@item (nnchoke-request-set-mark GROUP ACTION &optional SERVER)

Set/remove/add marks on articles.  Normally Gnus handles the article
marks (such as read, ticked, expired etc) internally, and store them in
@file{~/.newsrc.eld}.  Some back ends (such as @acronym{IMAP}) however carry
all information about the articles on the server, so Gnus need to
propagate the mark information to the server.

@var{action} is a list of mark setting requests, having this format:

@example
(RANGE ACTION MARK)
@end example

@var{range} is a range of articles you wish to update marks on.
marks (preserving all marks not mentioned).  @var{mark} is a list of
marks; where each mark is a symbol.  Currently used marks are
@code{forward} and @code{recent}, but your back end should, if
possible, not limit itself to these.

Given contradictory actions, the last action in the list should be the
effective one.  That is, if your action contains a request to add the
@code{tick} mark on article 1 and, later in the list, a request to
remove the mark on the same article, the mark should in fact be removed.

An example action list:

@example
(((5 12 30) 'del '(tick))
@end example

The function should return a range of articles it wasn't able to set the
mark on (currently not used for anything).

There should be no result data from this function.

@item (nnchoke-request-update-mark GROUP ARTICLE MARK)

If the user tries to set a mark that the back end doesn't like, this
function may change the mark.  Gnus will use whatever this function
returns as the mark for @var{article} instead of the original
@var{mark}.  If the back end doesn't care, it must return the original
@var{mark}, and not @code{nil} or any other type of garbage.

The only use for this I can see is what @code{nnvirtual} does with
it---if a component group is auto-expirable, marking an article as read
in the virtual group should result in the article being marked as
expirable.

There should be no result data from this function.

@item (nnchoke-request-scan &optional GROUP SERVER)

This function may be called at any time (by Gnus or anything else) to
request that the back end check for incoming articles, in one way or
another.  A mail back end will typically read the spool file or query
the @acronym{POP} server when this function is invoked.  The
@var{group} doesn't have to be heeded---if the back end decides that
it is too much work just scanning for a single group, it may do a
total scan of all groups.  It would be nice, however, to keep things
local if that's practical.

There should be no result data from this function.

@item (nnchoke-request-group-description GROUP &optional SERVER)

The result data from this function should be a description of
@var{group}.

@example
description-line = name <TAB> description eol
name             = <string>
description      = <text>
@end example

@item (nnchoke-request-list-newsgroups &optional SERVER)

The result data from this function should be the description of all
groups available on the server.

@example
description-buffer = *description-line
@end example

@item (nnchoke-request-newgroups DATE &optional SERVER)

The result data from this function should be all groups that were
created after @samp{date}, which is in normal human-readable date format
(i.e., the date format used in mail and news headers, and returned by
the function @code{message-make-date} by default).  The data should be
in the active buffer format.

It is okay for this function to return too many'' groups; some back ends
might find it cheaper to return the full list of groups, rather than
just the new groups.  But don't do this for back ends with many groups.
Normally, if the user creates the groups herself, there won't be too
many groups, so @code{nnml} and the like are probably safe.  But for
back ends like @code{nntp}, where the groups have been created by the
server, it is quite likely that there can be many groups.

@item (nnchoke-request-create-group GROUP &optional SERVER)

This function should create an empty group with name @var{group}.

There should be no return data.

@item (nnchoke-request-expire-articles ARTICLES &optional GROUP SERVER FORCE)

This function should run the expiry process on all articles in the
@var{articles} range (which is currently a simple list of article
numbers.)  It is left up to the back end to decide how old articles
should be before they are removed by this function.  If @var{force} is
non-@code{nil}, all @var{articles} should be deleted, no matter how new
they are.

This function should return a list of articles that it did not/was not
able to delete.

There should be no result data returned.

@item (nnchoke-request-move-article ARTICLE GROUP SERVER ACCEPT-FORM &optional LAST)

This function should move @var{article} (which is a number) from
@var{group} by calling @var{accept-form}.

This function should ready the article in question for moving by
removing any header lines it has added to the article, and generally
should tidy up'' the article.  Then it should @code{eval}
@var{accept-form} in the buffer where the tidy'' article is.  This
will do the actual copying.  If this @code{eval} returns a
non-@code{nil} value, the article should be removed.

If @var{last} is @code{nil}, that means that there is a high likelihood
that there will be more requests issued shortly, so that allows some
optimizations.

The function should return a cons where the @code{car} is the group name and
the @code{cdr} is the article number that the article was entered as.

There should be no data returned.

@item (nnchoke-request-accept-article GROUP &optional SERVER LAST)

This function takes the current buffer and inserts it into @var{group}.
If @var{last} in @code{nil}, that means that there will be more calls to
this function in short order.

The function should return a cons where the @code{car} is the group name and
the @code{cdr} is the article number that the article was entered as.

The group should exist before the back end is asked to accept the
article for that group.

There should be no data returned.

@item (nnchoke-request-replace-article ARTICLE GROUP BUFFER)

This function should remove @var{article} (which is a number) from
@var{group} and insert @var{buffer} there instead.

There should be no data returned.

@item (nnchoke-request-delete-group GROUP FORCE &optional SERVER)

This function should delete @var{group}.  If @var{force}, it should
really delete all the articles in the group, and then delete the group
itself.  (If there is such a thing as the group itself''.)

There should be no data returned.

@item (nnchoke-request-rename-group GROUP NEW-NAME &optional SERVER)

This function should rename @var{group} into @var{new-name}.  All
articles in @var{group} should move to @var{new-name}.

There should be no data returned.

@end table

@node Error Messaging
@subsubsection Error Messaging

The back ends should use the function @code{nnheader-report} to report
error conditions---they should not raise errors when they aren't able to
perform a request.  The first argument to this function is the back end
symbol, and the rest are interpreted as arguments to @code{format} if
there are multiple of them, or just a string if there is one of them.
This function must always returns @code{nil}.

@lisp
(nnheader-report 'nnchoke "You did something totally bogus")

(nnheader-report 'nnchoke "Could not request group %s" group)
@end lisp

Gnus, in turn, will call @code{nnheader-get-report} when it gets a
@code{nil} back from a server, and this function returns the most
recently reported message for the back end in question.  This function
takes one argument---the server symbol.

Internally, these functions access @var{back-end}@code{-status-string},
so the @code{nnchoke} back end will have its error message stored in
@code{nnchoke-status-string}.

@node Writing New Back Ends
@subsubsection Writing New Back Ends

Many back ends are quite similar.  @code{nnml} is just like
@code{nnspool}, but it allows you to edit the articles on the server.
@code{nnmh} is just like @code{nnml}, but it doesn't use an active file,
and it doesn't maintain overview databases.  @code{nndir} is just like
@code{nnml}, but it has no concept of groups'', and it doesn't allow
editing articles.

It would make sense if it were possible to inherit'' functions from
back ends when writing new back ends.  And, indeed, you can do that if you
want to.  (You don't have to if you don't want to, of course.)

All the back ends declare their public variables and functions by using a
package called @code{nnoo}.

To inherit functions from other back ends (and allow other back ends to
inherit functions from the current back end), you should use the
following macros:

@table @code

@item nnoo-declare
This macro declares the first parameter to be a child of the subsequent
parameters.  For instance:

@lisp
(nnoo-declare nndir
nnml nnmh)
@end lisp

@code{nndir} has declared here that it intends to inherit functions from
both @code{nnml} and @code{nnmh}.

@item defvoo
This macro is equivalent to @code{defvar}, but registers the variable as
a public server variable.  Most state-oriented variables should be
declared with @code{defvoo} instead of @code{defvar}.

In addition to the normal @code{defvar} parameters, it takes a list of
variables in the parent back ends to map the variable to when executing
a function in those back ends.

@lisp
(defvoo nndir-directory nil
"Where nndir will look for groups."
nnml-current-directory nnmh-current-directory)
@end lisp

This means that @code{nnml-current-directory} will be set to
@code{nndir-directory} when an @code{nnml} function is called on behalf
of @code{nndir}.  (The same with @code{nnmh}.)

@item nnoo-define-basics
This macro defines some common functions that almost all back ends should
have.

@lisp
(nnoo-define-basics nndir)
@end lisp

@item deffoo
This macro is just like @code{defun} and takes the same parameters.  In
addition to doing the normal @code{defun} things, it registers the
function as being public so that other back ends can inherit it.

@item nnoo-map-functions
This macro allows mapping of functions from the current back end to
functions from the parent back ends.

@lisp
(nnoo-map-functions nndir
(nnmh-request-article 0 nndir-current-group 0 0))
@end lisp

This means that when @code{nndir-retrieve-headers} is called, the first,
third, and fourth parameters will be passed on to
@code{nnml-retrieve-headers}, while the second parameter is set to the
value of @code{nndir-current-group}.

@item nnoo-import
This macro allows importing functions from back ends.  It should be the
last thing in the source file, since it will only define functions that

@lisp
(nnoo-import nndir
(nnmh
nnmh-request-list
nnmh-request-newgroups)
(nnml))
@end lisp

This means that calls to @code{nndir-request-list} should just be passed
on to @code{nnmh-request-list}, while all public functions from
@code{nnml} that haven't been defined in @code{nndir} yet should be
defined now.

@end table

Below is a slightly shortened version of the @code{nndir} back end.

@lisp
;;; @r{nndir.el --- single directory newsgroup access for Gnus}
;; @r{Copyright (C) 1995,96 Free Software Foundation, Inc.}

;;; @r{Code:}

(require 'nnmh)
(require 'nnml)
(require 'nnoo)
(eval-when-compile (require 'cl))

(nnoo-declare nndir
nnml nnmh)

(defvoo nndir-directory nil
"Where nndir will look for groups."
nnml-current-directory nnmh-current-directory)

(defvoo nndir-nov-is-evil nil
"*Non-nil means that nndir will never retrieve NOV headers."
nnml-nov-is-evil)

(defvoo nndir-current-group ""
nil
nnml-current-group nnmh-current-group)
(defvoo nndir-top-directory nil nil nnml-directory nnmh-directory)
(defvoo nndir-get-new-mail nil nil nnml-get-new-mail nnmh-get-new-mail)

(defvoo nndir-status-string "" nil nnmh-status-string)
(defconst nndir-version "nndir 1.0")

;;; @r{Interface functions.}

(nnoo-define-basics nndir)

(deffoo nndir-open-server (server &optional defs)
(setq nndir-directory
server))
(unless (assq 'nndir-directory defs)
(push (nndir-directory ,server) defs))
(push (nndir-current-group
,(file-name-nondirectory
(directory-file-name nndir-directory)))
defs)
(push (nndir-top-directory
,(file-name-directory (directory-file-name nndir-directory)))
defs)
(nnoo-change-server 'nndir server defs))

(nnoo-map-functions nndir
(nnmh-request-article 0 nndir-current-group 0 0)
(nnmh-request-group nndir-current-group 0 0)
(nnmh-close-group nndir-current-group 0))

(nnoo-import nndir
(nnmh
nnmh-status-message
nnmh-request-list
nnmh-request-newgroups))

(provide 'nndir)
@end lisp

@node Hooking New Back Ends Into Gnus
@subsubsection Hooking New Back Ends Into Gnus

@vindex gnus-valid-select-methods
@findex gnus-declare-backend
Having Gnus start using your new back end is rather easy---you just
declare it with the @code{gnus-declare-backend} functions.  This will
enter the back end into the @code{gnus-valid-select-methods} variable.

@code{gnus-declare-backend} takes two parameters---the back end name and
an arbitrary number of @dfn{abilities}.

Here's an example:

@lisp
@end lisp

The above line would then go in the @file{nnchoke.el} file.

The abilities can be:

@table @code
@item mail
This is a mailish back end---followups should (probably) go via mail.
@item post
This is a newsish back end---followups should (probably) go via news.
@item post-mail
This back end supports both mail and news.
@item none
This is neither a post nor mail back end---it's something completely
different.
@item respool
It supports respooling---or rather, it is able to modify its source
articles and groups.
The name of the server should be in the virtual server name.  This is
true for almost all back ends.
The user should be prompted for an address when doing commands like
@kbd{B} in the group buffer.  This is true for back ends like
@code{nntp}, but not @code{nnmbox}, for instance.
@end table

@node Mail-like Back Ends
@subsubsection Mail-like Back Ends

One of the things that separate the mail back ends from the rest of the
back ends is the heavy dependence by most of the mail back ends on
common functions in @file{nnmail.el}.  For instance, here's the
definition of @code{nnml-request-scan}:

@lisp
(deffoo nnml-request-scan (&optional group server)
(setq nnml-article-file-alist nil)
(nnmail-get-new-mail 'nnml 'nnml-save-nov nnml-directory group))
@end lisp

It simply calls @code{nnmail-get-new-mail} with a few parameters,
and @code{nnmail} takes care of all the moving and splitting of the
mail.

This function takes four parameters.

@table @var
@item method
This should be a symbol to designate which back end is responsible for
the call.

@item exit-function
This function should be called after the splitting has been performed.

@item temp-directory
Where the temporary files should be stored.

@item group
This optional argument should be a group name if the splitting is to be
performed for one group only.
@end table

@code{nnmail-get-new-mail} will call @var{back-end}@code{-save-mail} to
save each article.  @var{back-end}@code{-active-number} will be called to

The function also uses the following variables:
@var{back-end}@code{-get-new-mail} (to see whether to get new mail for
this back end); and @var{back-end}@code{-group-alist} and
@var{back-end}@code{-active-file} to generate the new active file.
@var{back-end}@code{-group-alist} should be a group-active alist, like
this:

@example
(("a-group" (1 . 10))
("some-group" (34 . 39)))
@end example

@node Score File Syntax
@subsection Score File Syntax

Score files are meant to be easily parseable, but yet extremely
mallable.  It was decided that something that had the same read syntax
as an Emacs Lisp list would fit that spec.

Here's a typical score file:

@lisp
(("summary"
("win95" -10000 nil s)
("Gnus"))
("from"
("Lars" -1000))
(mark -100))
@end lisp

BNF definition of a score file:

@example
score-file      = "" / "(" *element ")"
element         = rule / atom
rule            = string-rule / number-rule / date-rule
string-rule     = "(" quote string-header quote space *string-match ")"
number-rule     = "(" quote number-header quote space *number-match ")"
date-rule       = "(" quote date-header quote space *date-match ")"
quote           = <ascii 34>
string-header   = "subject" / "from" / "references" / "message-id" /
"xref" / "body" / "head" / "all" / "followup"
string-match    = "(" quote <string> quote [ "" / [ space score [ "" /
space date [ "" / [ space string-match-t ] ] ] ] ] ")"
score           = "nil" / <integer>
date            = "nil" / <natural number>
string-match-t  = "nil" / "s" / "substring" / "S" / "Substring" /
"r" / "regex" / "R" / "Regex" /
"e" / "exact" / "E" / "Exact" /
"f" / "fuzzy" / "F" / "Fuzzy"
number-match    = "(" <integer> [ "" / [ space score [ "" /
space date [ "" / [ space number-match-t ] ] ] ] ] ")"
number-match-t  = "nil" / "=" / "<" / ">" / ">=" / "<="
date-match      = "(" quote <string> quote [ "" / [ space score [ "" /
space date [ "" / [ space date-match-t ] ] ] ] ")"
date-match-t    = "nil" / "at" / "before" / "after"
atom            = "(" [ required-atom / optional-atom ] ")"
required-atom   = mark / expunge / mark-and-expunge / files /
optional-atom   = adapt / local / eval
mark            = "mark" space nil-or-number
nil-or-number   = "nil" / <integer>
expunge         = "expunge" space nil-or-number
mark-and-expunge = "mark-and-expunge" space nil-or-number
files           = "files" *[ space <string> ]
exclude-files   = "exclude-files" *[ space <string> ]
adapt-rule      = "(" *[ <string> *[ "(" <string> <integer> ")" ] ")"
local           = "local" *[ space "(" <string> space <form> ")" ]
eval            = "eval" space <form>
space           = *[ " " / <TAB> / <NEWLINE> ]
@end example

Any unrecognized elements in a score file should be ignored, but not

As you can see, white space is needed, but the type and amount of white
space is irrelevant.  This means that formatting of the score file is
left up to the programmer---if it's simpler to just spew it all out on
one looong line, then that's ok.

The meaning of the various atoms are explained elsewhere in this
manual (@pxref{Score File Format}).

Internally Gnus uses a format for storing article headers that
corresponds to the @acronym{NOV} format in a mysterious fashion.  One could
almost suspect that the author looked at the @acronym{NOV} specification and
just shamelessly @emph{stole} the entire thing, and one would be right.

@dfn{Header} is a severely overloaded term.  Header'' is used in
RFC 1036 to talk about lines in the head of an article (e.g.,
@code{From}).  It is used by many people as a synonym for
head''---the header and the body''.  (That should be avoided, in my
opinion.)  And Gnus uses a format internally that it calls header'',
which is what I'm talking about here.  This is a 9-element vector,
basically, with each header (ouch) having one slot.

These slots are, in order: @code{number}, @code{subject}, @code{from},
@code{date}, @code{id}, @code{references}, @code{chars}, @code{lines},
@code{xref}, and @code{extra}.  There are macros for accessing and
setting these slots---they all have predictable names beginning with

All these slots contain strings, except the @code{extra} slot, which
contains an alist of header/value pairs (@pxref{To From Newsgroups}).

@node Ranges
@subsection Ranges

@sc{gnus} introduced a concept that I found so useful that I've started
using it a lot and have elaborated on it greatly.

The question is simple: If you have a large amount of objects that are
identified by numbers (say, articles, to take a @emph{wild} example)
that you want to qualify as being included'', a normal sequence isn't
very useful.  (A 200,000 length sequence is a bit long-winded.)

The solution is as simple as the question: You just collapse the
sequence.

@example
(1 2 3 4 5 6 10 11 12)
@end example

is transformed into

@example
((1 . 6) (10 . 12))
@end example

To avoid having those nasty @samp{(13 . 13)} elements to denote a
lonesome object, a @samp{13} is a valid element:

@example
((1 . 6) 7 (10 . 12))
@end example

This means that comparing two ranges to find out whether they are equal
is slightly tricky:

@example
((1 . 5) 7 8 (10 . 12))
@end example

and

@example
((1 . 5) (7 . 8) (10 . 12))
@end example

are equal.  In fact, any non-descending list is a range:

@example
(1 2 3 4 5)
@end example

is a perfectly valid range, although a pretty long-winded one.  This is
also valid:

@example
(1 . 5)
@end example

and is equal to the previous range.

Here's a BNF definition of ranges.  Of course, one must remember the
semantic requirement that the numbers are non-descending.  (Any number
of repetition of the same number is allowed, but apt to disappear in
range handling.)

@example
range           = simple-range / normal-range
simple-range    = "(" number " . " number ")"
normal-range    = "(" start-contents ")"
contents        = "" / simple-range *[ " " contents ] /
number *[ " " contents ]
@end example

Gnus currently uses ranges to keep track of read articles and article
marks.  I plan on implementing a number of range operators in C if The
Powers That Be are willing to let me.  (I haven't asked yet, because I
need to do some more thinking on what operators I need to make life
totally range-based without ever having to convert back to normal
sequences.)

@node Group Info
@subsection Group Info

Gnus stores all permanent info on groups in a @dfn{group info} list.
This list is from three to six elements (or more) long and exhaustively
describes the group.

Here are two example group infos; one is a very simple group while the
second is a more complex one:

@example
("no.group" 5 ((1 . 54324)))

("nnml:my.mail" 3 ((1 . 5) 9 (20 . 55))
((tick (15 . 19)) (replied 3 6 (19 . 3)))
(nnml "")
((auto-expire . t) (to-address . "ding@@gnus.org")))
@end example

The first element is the @dfn{group name}---as Gnus knows the group,
anyway.  The second element is the @dfn{subscription level}, which
normally is a small integer.  (It can also be the @dfn{rank}, which is a
cons cell where the @code{car} is the level and the @code{cdr} is the
score.)  The third element is a list of ranges of read articles.  The
fourth element is a list of lists of article marks of various kinds.
The fifth element is the select method (or virtual server, if you like).
The sixth element is a list of @dfn{group parameters}, which is what

Any of the last three elements may be missing if they are not required.
In fact, the vast majority of groups will normally only have the first
three elements, which saves quite a lot of cons cells.

Here's a BNF definition of the group info format:

@example
info          = "(" group space ralevel space read
[ "" / [ space marks-list [ "" / [ space method [ "" /
space parameters ] ] ] ] ] ")"
group         = quote <string> quote
ralevel       = rank / level
level         = <integer in the range of 1 to inf>
rank          = "(" level "." score ")"
score         = <integer in the range of 1 to inf>
marks-lists   = nil / "(" *marks ")"
marks         = "(" <string> range ")"
method        = "(" <string> *elisp-forms ")"
parameters    = "(" *elisp-forms ")"
@end example

Actually that @samp{marks} rule is a fib.  A @samp{marks} is a
@samp{<string>} consed on to a @samp{range}, but that's a bitch to say
in pseudo-BNF.

If you have a Gnus info and want to access the elements, Gnus offers a
series of macros for getting/setting these elements.

@table @code
@item gnus-info-group
@itemx gnus-info-set-group
@findex gnus-info-group
@findex gnus-info-set-group
Get/set the group name.

@item gnus-info-rank
@itemx gnus-info-set-rank
@findex gnus-info-rank
@findex gnus-info-set-rank
Get/set the group rank (@pxref{Group Score}).

@item gnus-info-level
@itemx gnus-info-set-level
@findex gnus-info-level
@findex gnus-info-set-level
Get/set the group level.

@item gnus-info-score
@itemx gnus-info-set-score
@findex gnus-info-score
@findex gnus-info-set-score
Get/set the group score (@pxref{Group Score}).

Get/set the ranges of read articles.

@item gnus-info-marks
@itemx gnus-info-set-marks
@findex gnus-info-marks
@findex gnus-info-set-marks
Get/set the lists of ranges of marked articles.

@item gnus-info-method
@itemx gnus-info-set-method
@findex gnus-info-method
@findex gnus-info-set-method
Get/set the group select method.

@item gnus-info-params
@itemx gnus-info-set-params
@findex gnus-info-params
@findex gnus-info-set-params
Get/set the group parameters.
@end table

All the getter functions take one parameter---the info list.  The setter
functions take two parameters---the info list and the new value.

The last three elements in the group info aren't mandatory, so it may be
necessary to extend the group info before setting the element.  If this
is necessary, you can just pass on a non-@code{nil} third parameter to
the three final setter functions to have this happen automatically.

@node Extended Interactive
@subsection Extended Interactive
@cindex interactive
@findex gnus-interactive

Gnus extends the standard Emacs @code{interactive} specification
slightly to allow easy use of the symbolic prefix (@pxref{Symbolic
Prefixes}).  Here's an example of how this is used:

@lisp
(defun gnus-summary-increase-score (&optional score symp)
(interactive (gnus-interactive "P\ny"))
...
)
@end lisp

The best thing to do would have been to implement
@code{gnus-interactive} as a macro which would have returned an
@code{interactive} form, but this isn't possible since Emacs checks
whether a function is interactive or not by simply doing an @code{assq}
on the lambda form.  So, instead we have @code{gnus-interactive}
function that takes a string and returns values that are usable to
@code{interactive}.

This function accepts (almost) all normal @code{interactive} specs, but

@table @samp
@item y
@vindex gnus-current-prefix-symbol
The current symbolic prefix---the @code{gnus-current-prefix-symbol}
variable.

@item Y
@vindex gnus-current-prefix-symbols
A list of the current symbolic prefixes---the
@code{gnus-current-prefix-symbol} variable.

@item A
The current article number---the @code{gnus-summary-article-number}
function.

@item H
function.

@item g
The current group name---the @code{gnus-group-group-name}
function.

@end table

@node Emacs/XEmacs Code
@subsection Emacs/XEmacs Code
@cindex XEmacs
@cindex Emacsen

While Gnus runs under Emacs, XEmacs and Mule, I decided that one of the
platforms must be the primary one.  I chose Emacs.  Not because I don't
like XEmacs or Mule, but because it comes first alphabetically.

This means that Gnus will byte-compile under Emacs with nary a warning,
while XEmacs will pump out gigabytes of warnings while byte-compiling.
As I use byte-compilation warnings to help me root out trivial errors in
Gnus, that's very useful.

I've also consistently used Emacs function interfaces, but have used
Gnusey aliases for the functions.  To take an example:  Emacs defines a
@code{run-at-time} function while XEmacs defines a @code{start-itimer}
function.  I then define a function called @code{gnus-run-at-time} that
takes the same parameters as the Emacs @code{run-at-time}.  When running
Gnus under Emacs, the former function is just an alias for the latter.
However, when running under XEmacs, the former is an alias for the
following function:

@lisp
(defun gnus-xmas-run-at-time (time repeat function &rest args)
(start-itimer
"gnus-run-at-time"
(lambda ()
(,function ,@@args))
time repeat))
@end lisp

This sort of thing has been done for bunches of functions.  Gnus does
not redefine any native Emacs functions while running under XEmacs---it
does this @code{defalias} thing with Gnus equivalents instead.  Cleaner
all over.

In the cases where the XEmacs function interface was obviously cleaner,
I used it instead.  For example @code{gnus-region-active-p} is an alias
for @code{region-active-p} in XEmacs, whereas in Emacs it is a function.

Of course, I could have chosen XEmacs as my native platform and done
mapping functions the other way around.  But I didn't.  The performance
hit these indirections impose on Gnus under XEmacs should be slight.

@node Various File Formats
@subsection Various File Formats

* Active File Format::          Information on articles and groups available.
* Newsgroups File Format::      Group descriptions.

@node Active File Format
@subsubsection Active File Format

The active file lists all groups available on the server in
question.  It also lists the highest and lowest current article numbers
in each group.

Here's an excerpt from a typical active file:

@example
soc.motss 296030 293865 y
alt.binaries.pictures.fractals 3922 3913 n
comp.sources.unix 1605 1593 m
comp.binaries.ibm.pc 5097 5089 y
no.general 1000 900 y
@end example

Here's a pseudo-BNF definition of this file:

@exa`