(defgroup time-stamp nil
"Maintain last change time stamps in files edited by Emacs."
:group 'data
:group 'extensions)
(defcustom time-stamp-format "%:y-%02m-%02d %02H:%02M:%02S %u"
"*Format of the string inserted by \\[time-stamp].
The value may be a string or a list. Lists are supported only for
backward compatibility; see variable `time-stamp-old-format-warn'.
A string is used verbatim except for character sequences beginning with %:
%:a weekday name: `Monday'. %#A gives uppercase: `MONDAY'
%3a abbreviated weekday: `Mon'. %3A gives uppercase: `MON'
%:b month name: `January'. %#B gives uppercase: `JANUARY'
%3b abbreviated month: `Jan'. %3B gives uppercase: `JAN'
%02d day of month
%02H 24-hour clock hour
%02I 12-hour clock hour
%02m month number
%02M minute
%#p `am' or `pm'. %P gives uppercase: `AM' or `PM'
%02S seconds
%w day number of week, Sunday is 0
%02y 2-digit year: `97' %:y 4-digit year: `1997'
%z time zone name: `est'. %Z gives uppercase: `EST'
Non-date items:
%% a literal percent character: `%'
%f file name without directory %F gives absolute pathname
%s system name
%u user's login name %U user's full name
%h mail host name
Decimal digits between the % and the type character specify the
field width. Strings are truncated on the right; years on the left.
A leading zero causes numbers to be zero-filled.
For example, to get the format used by the `date' command,
use \"%3a %3b %2d %02H:%02M:%02S %Z %:y\".
In the future these formats will be aligned more with format-time-string.
Because of this transition, the default padding for numeric formats will
change in a future version. Therefore either a padding width should be
specified, or the : modifier should be used to explicitly request the
historical default."
:type 'string
:group 'time-stamp)
(defcustom time-stamp-active t
"*Non-nil to enable time-stamping of buffers by \\[time-stamp].
Can be toggled by \\[time-stamp-toggle-active].
See also the variable `time-stamp-warn-inactive'."
:type 'boolean
:group 'time-stamp)
(defcustom time-stamp-warn-inactive t
"Non-nil to have \\[time-stamp] warn if a buffer did not get time-stamped.
A warning is printed if `time-stamp-active' is nil and the buffer contains
a time stamp template that would otherwise have been updated."
:type 'boolean
:group 'time-stamp)
(defcustom time-stamp-old-format-warn 'ask
"Action to take if `time-stamp-format' is an old-style list.
If `error', the format is not used. If `ask', the user is queried about
using the time-stamp-format. If `warn', a warning is displayed.
If nil, no notification is given."
:type '(choice (const :tag "No notification" nil)
(const :tag "Don't use the format" error)
(const ask) (const warn))
:group 'time-stamp)
(defcustom time-stamp-time-zone nil
"If non-nil, a string naming the timezone to be used by \\[time-stamp].
Format is the same as that used by the environment variable TZ on your system."
:type '(choice (const nil) string)
:group 'time-stamp)
(defvar time-stamp-line-limit 8 "Lines of a file searched; positive counts from start, negative from end.
The patterns `time-stamp-start' and `time-stamp-end' must be found on one
of the first (last) `time-stamp-line-limit' lines of the file for the
file to be time-stamped by \\[time-stamp]. A value of 0 searches the
entire buffer (use with care).
Do not change `time-stamp-line-limit', `time-stamp-start', or
`time-stamp-end' for yourself or you will be incompatible
with other people's files! If you must change them for some application,
do so in the local variables section of the time-stamped file itself.")
(defvar time-stamp-start "Time-stamp:[ \t]+\\\\?[\"<]+" "Regexp after which the time stamp is written by \\[time-stamp].
See also the variables `time-stamp-end' and `time-stamp-line-limit'.
Do not change `time-stamp-line-limit', `time-stamp-start', or
`time-stamp-end' for yourself or you will be incompatible
with other people's files! If you must change them for some application,
do so in the local variables section of the time-stamped file itself.")
(defvar time-stamp-end "\\\\?[\">]" "Regexp marking the text after the time stamp.
\\[time-stamp] deletes the text between the first match of `time-stamp-start'
and the following match of `time-stamp-end' on the same line,
then writes the time stamp specified by `time-stamp-format' between them.
Do not change `time-stamp-line-limit', `time-stamp-start', or
`time-stamp-end' for yourself or you will be incompatible
with other people's files! If you must change them for some application,
do so in the local variables section of the time-stamped file itself.")
(defvar time-stamp-pattern "%%" "Convenience variable setting all time-stamp location and format variables.
This string has four parts, each of which is optional.
These four parts set time-stamp-line-limit, time-stamp-start,
time-stamp-format, and time-stamp-end. See the documentation
for each of these variables for details.
The first part is a number followed by a slash; the number sets the number
of lines at the beginning (negative counts from end) of the file searched
for the time-stamp. The number and the slash may be omitted to use the
normal value.
The second part is a regexp identifying the pattern preceding the time stamp.
This part may be omitted to use the normal pattern.
The third part specifies the format of the time-stamp inserted. See
the documentation for time-stamp-format for details. Specify this
part as \"%%\" to use the normal format.
The fourth part is a regexp identifying the pattern following the time stamp.
This part may be omitted to use the normal pattern.
As an example, the default behavior can be specified something like this:
\"8/Time-stamp: [\\\"<]%:y-%02m-%02d %02H:%02M:%02S %u[\\\">]\"
Do not change `time-stamp-pattern' for yourself or you will be incompatible
with other people's files! Set it only in the local variables section
of the time-stamped file itself.")
(defun time-stamp ()
"Update the time stamp string in the buffer.
A template in a file can be automatically updated with a new time stamp
every time you save the file. Add this line to your .emacs file:
(add-hook 'write-file-hooks 'time-stamp)
Normally the template must appear in the first 8 lines of a file and
look like one of the following:
Time-stamp: <>
Time-stamp: \" \"
The time stamp is written between the brackets or quotes:
Time-stamp: <1998-02-18 10:20:51 gildea>
The time stamp is updated only if the variable `time-stamp-active' is non-nil.
The format of the time stamp is set by the variable `time-stamp-format'.
The variables `time-stamp-line-limit', `time-stamp-start',
and `time-stamp-end' control finding the template."
(interactive)
(let ((case-fold-search nil)
(start nil)
(end nil)
search-limit
(line-limit time-stamp-line-limit)
(ts-start time-stamp-start)
(ts-format time-stamp-format)
(ts-end time-stamp-end))
(if (stringp time-stamp-pattern)
(progn
(string-match "\\`\\(\\(-?[0-9]+\\)/\\)?\\([^%]+\\)?\\(\\(.\\|\n\\)*%[-.,:@+_ #^()0-9]*[A-Za-z%]\\)?\\([^%]+\\)?\\'" time-stamp-pattern)
(and (match-beginning 2)
(setq line-limit
(string-to-int (match-string 2 time-stamp-pattern))))
(and (match-beginning 3)
(setq ts-start (match-string 3 time-stamp-pattern)))
(and (match-beginning 4)
(not (string-equal (match-string 4 time-stamp-pattern) "%%"))
(setq ts-format (match-string 4 time-stamp-pattern)))
(and (match-beginning 6)
(setq ts-end (match-string 6 time-stamp-pattern)))))
(cond ((not (integerp line-limit))
(setq line-limit 8)
(message "time-stamp-line-limit is not an integer")
(sit-for 1)))
(save-excursion
(save-restriction
(widen)
(cond ((> line-limit 0)
(goto-char (setq start (point-min)))
(forward-line line-limit)
(setq search-limit (point)))
((< line-limit 0)
(goto-char (setq search-limit (point-max)))
(forward-line line-limit)
(setq start (point)))
(t (setq start (point-min))
(setq search-limit (point-max))))
(goto-char start)
(while (and (< (point) search-limit)
(not end)
(re-search-forward ts-start search-limit 'move))
(setq start (point))
(end-of-line)
(let ((line-end (point)))
(goto-char start)
(if (re-search-forward ts-end line-end 'move)
(setq end (match-beginning 0)))))))
(if end
(progn
(cond
((not time-stamp-active)
(if time-stamp-warn-inactive
(progn
(message "Warning: time-stamp-active is off; did not time-stamp buffer.")
(sit-for 1))))
((not (and (stringp ts-start)
(stringp ts-end)))
(message "time-stamp-start or time-stamp-end is not a string")
(sit-for 1))
(t
(let ((new-time-stamp (time-stamp-string ts-format)))
(if (and (stringp new-time-stamp)
(not (string-equal (buffer-substring start end)
new-time-stamp)))
(save-excursion
(save-restriction
(widen)
(delete-region start end)
(goto-char start)
(insert-and-inherit new-time-stamp)
(setq end (point))
(goto-char start)
(if (search-forward "\t" end t)
(untabify start end)))))))))))
nil)
(defun time-stamp-toggle-active (&optional arg)
"Toggle `time-stamp-active', setting whether \\[time-stamp] updates a buffer.
With arg, turn time stamping on if and only if arg is positive."
(interactive "P")
(setq time-stamp-active
(if (null arg)
(not time-stamp-active)
(> (prefix-numeric-value arg) 0)))
(message "time-stamp is now %s." (if time-stamp-active "active" "off")))
(defconst time-stamp-no-file "(no file)"
"String to use when the buffer is not associated with a file.")
(defun time-stamp-string-preprocess (format &optional time)
(let ((fmt-len (length format))
(ind 0)
cur-char
(prev-char nil)
(result "")
field-width
field-result
alt-form change-case require-padding
(paren-level 0))
(while (< ind fmt-len)
(setq cur-char (aref format ind))
(setq
result
(concat result
(cond
((eq cur-char ?%)
(setq alt-form nil change-case nil require-padding nil field-width "")
(while (progn
(setq ind (1+ ind))
(setq cur-char (if (< ind fmt-len)
(aref format ind)
?\0))
(or (eq ?. cur-char)
(eq ?, cur-char) (eq ?: cur-char) (eq ?@ cur-char)
(eq ?- cur-char) (eq ?+ cur-char) (eq ?_ cur-char)
(eq ?\ cur-char) (eq ?# cur-char) (eq ?^ cur-char)
(and (eq ?\( cur-char)
(not (eq prev-char ?\\))
(setq paren-level (1+ paren-level)))
(if (and (eq ?\) cur-char)
(not (eq prev-char ?\\))
(> paren-level 0))
(setq paren-level (1- paren-level))
(and (> paren-level 0)
(< ind fmt-len)))
(if (and (<= ?0 cur-char) (>= ?9 cur-char))
(let ((field-index ind))
(while (progn
(setq ind (1+ ind))
(setq cur-char (if (< ind fmt-len)
(aref format ind)
?\0))
(and (<= ?0 cur-char) (>= ?9 cur-char))))
(setq field-width (substring format field-index ind))
(setq ind (1- ind))
t))))
(setq prev-char cur-char)
(cond ((eq cur-char ?:)
(setq alt-form t))
((eq cur-char ?#)
(setq change-case t))))
(setq field-result
(cond
((eq cur-char ?%)
"%")
((eq cur-char ?a) (if change-case
(format-time-string "%#A" time)
(or alt-form (not (string-equal field-width ""))
(time-stamp-conv-warn "%a" "%:a"))
(if (and alt-form (not (string-equal field-width "")))
"" (format-time-string "%A" time))))
((eq cur-char ?A)
(if alt-form
(format-time-string "%A" time)
(or change-case (not (string-equal field-width ""))
(time-stamp-conv-warn "%A" "%#A"))
(format-time-string "%#A" time)))
((eq cur-char ?b) (if change-case
(format-time-string "%#B" time)
(or alt-form (not (string-equal field-width ""))
(time-stamp-conv-warn "%b" "%:b"))
(if (and alt-form (not (string-equal field-width "")))
"" (format-time-string "%B" time))))
((eq cur-char ?B)
(if alt-form
(format-time-string "%B" time)
(or change-case (not (string-equal field-width ""))
(time-stamp-conv-warn "%B" "%#B"))
(format-time-string "%#B" time)))
((eq cur-char ?d) (time-stamp-do-number cur-char alt-form field-width time))
((eq cur-char ?H) (time-stamp-do-number cur-char alt-form field-width time))
((eq cur-char ?I) (time-stamp-do-number cur-char alt-form field-width time))
((eq cur-char ?m) (time-stamp-do-number cur-char alt-form field-width time))
((eq cur-char ?M) (time-stamp-do-number cur-char alt-form field-width time))
((eq cur-char ?p) (or change-case
(time-stamp-conv-warn "%p" "%#p"))
(format-time-string "%#p" time))
((eq cur-char ?P) (format-time-string "%p" time))
((eq cur-char ?S) (time-stamp-do-number cur-char alt-form field-width time))
((eq cur-char ?w) (format-time-string "%w" time))
((eq cur-char ?y) (or alt-form (not (string-equal field-width ""))
(time-stamp-conv-warn "%y" "%:y"))
(string-to-int (format-time-string "%Y" time)))
((eq cur-char ?Y) (string-to-int (format-time-string "%Y" time)))
((eq cur-char ?z) (if change-case
"" (format-time-string "%#Z" time)))
((eq cur-char ?Z)
(if change-case
(format-time-string "%#Z" time)
(format-time-string "%Z" time)))
((eq cur-char ?f) (if buffer-file-name
(file-name-nondirectory buffer-file-name)
time-stamp-no-file))
((eq cur-char ?F) (or buffer-file-name
time-stamp-no-file))
((eq cur-char ?s) (system-name))
((eq cur-char ?u) (user-login-name))
((eq cur-char ?U) (user-full-name))
((eq cur-char ?h) (time-stamp-mail-host-name))
))
(if (string-equal field-width "")
field-result
(let ((padded-result
(format (format "%%%s%c"
field-width
(if (numberp field-result) ?d ?s))
(or field-result ""))))
(let ((initial-length (length padded-result))
(desired-length (string-to-int field-width)))
(if (> initial-length desired-length)
(if (stringp field-result)
(substring padded-result 0 desired-length)
(if (eq cur-char ?y)
(substring padded-result (- desired-length))
padded-result)) padded-result)))))
(t
(char-to-string cur-char)))))
(setq ind (1+ ind)))
result))
(defun time-stamp-do-number (format-char alt-form field-width time)
(let ((format-string (concat "%" (char-to-string format-char))))
(and (not alt-form) (string-equal field-width "")
(time-stamp-conv-warn format-string
(format "%%:%c" format-char)))
(if (and alt-form (not (string-equal field-width "")))
"" (string-to-int (format-time-string format-string time)))))
(defvar time-stamp-conversion-warn t
"Non-nil to warn about soon-to-be-unsupported forms in time-stamp-format.
In would be a bad idea to disable these warnings!
You really need to update your files instead.
The new formats will work with old versions of Emacs.
New formats are being recommended now to allow time-stamp-format
to change in the future to be compatible with format-time-string.
The new forms being recommended now will continue to work then.")
(defun time-stamp-conv-warn (old-form new-form)
(cond
(time-stamp-conversion-warn
(save-excursion
(set-buffer (get-buffer-create "*Time-stamp-compatibility*"))
(goto-char (point-max))
(if (bobp)
(progn
(insert
"The formats recognized in time-stamp-format will change in a future release\n"
"to be compatible with the new, expanded format-time-string function.\n\n"
"The following obsolescent time-stamp-format construct(s) were found:\n\n")))
(insert "\"" old-form "\" -- use " new-form "\n"))
(display-buffer "*Time-stamp-compatibility*"))))
(defun time-stamp-string (&optional ts-format)
"Generate the new string to be inserted by \\[time-stamp].
Optionally use FORMAT."
(or ts-format
(setq ts-format time-stamp-format))
(if (stringp ts-format)
(if (stringp time-stamp-time-zone)
(let ((real-time-zone (getenv "TZ")))
(unwind-protect
(progn
(setenv "TZ" time-stamp-time-zone)
(format-time-string
(time-stamp-string-preprocess ts-format)))
(setenv "TZ" real-time-zone)))
(format-time-string
(time-stamp-string-preprocess ts-format)))
(cond ((or (eq time-stamp-old-format-warn 'error)
(and (eq time-stamp-old-format-warn 'ask)
(not (y-or-n-p "Use non-string time-stamp-format? "))))
(message "Warning: no time-stamp: time-stamp-format not a string")
(sit-for 1)
nil)
(t
(cond ((eq time-stamp-old-format-warn 'warn)
(message "Obsolescent time-stamp-format type; should be string")
(sit-for 1)))
(time-stamp-fconcat ts-format " ")))))
(defconst time-stamp-no-file "(no file)"
"String to use when the buffer is not associated with a file.")
(defun time-stamp-mail-host-name ()
"Return the name of the host where the user receives mail.
This is the value of `mail-host-address' if bound and a string,
otherwise the value of the function system-name."
(or (and (boundp 'mail-host-address)
(stringp mail-host-address)
mail-host-address)
(system-name)))
(defun time-stamp-fconcat (list sep)
"Similar to (mapconcat 'funcall LIST SEP) but LIST allows literals.
If an element of LIST is a symbol, it is funcalled to get the string to use;
the separator SEP is used between two strings obtained by funcalling a
symbol. Otherwise the element itself is inserted; no separator is used
around literals."
(let ((return-string "")
(insert-sep-p nil))
(while list
(cond ((symbolp (car list))
(if insert-sep-p
(setq return-string (concat return-string sep)))
(setq return-string (concat return-string (funcall (car list))))
(setq insert-sep-p t))
(t
(setq return-string (concat return-string (car list)))
(setq insert-sep-p nil)))
(setq list (cdr list)))
return-string))
(defun time-stamp-month-dd-yyyy ()
"Return the current date as a string in \"Month DD, YYYY\" form."
(format-time-string "%B %e, %Y"))
(defun time-stamp-dd/mm/yyyy ()
"Return the current date as a string in \"DD/MM/YYYY\" form."
(format-time-string "%d/%m/%Y"))
(defun time-stamp-mon-dd-yyyy ()
"Return the current date as a string in \"Mon DD YYYY\" form.
The first character of DD is space if the value is less than 10."
(format-time-string "%b %d %Y"))
(defun time-stamp-dd-mon-yy ()
"Return the current date as a string in \"DD Mon YY\" form."
(format-time-string "%d %b %y"))
(defun time-stamp-yy/mm/dd ()
"Return the current date as a string in \"YY/MM/DD\" form."
(format-time-string "%y/%m/%d"))
(defun time-stamp-yyyy/mm/dd ()
"Return the current date as a string in \"YYYY/MM/DD\" form."
(format-time-string "%Y/%m/%d"))
(defun time-stamp-yyyy-mm-dd ()
"Return the current date as a string in \"YYYY-MM-DD\" form."
(format-time-string "%Y-%m-%d"))
(defun time-stamp-yymmdd ()
"Return the current date as a string in \"YYMMDD\" form."
(format-time-string "%y%m%d"))
(defun time-stamp-hh:mm:ss ()
"Return the current time as a string in \"HH:MM:SS\" form."
(format-time-string "%T"))
(defun time-stamp-hhmm ()
"Return the current time as a string in \"HHMM\" form."
(format-time-string "%H%M"))
(provide 'time-stamp)