(provide 'mh-mime)
(require 'mh-comp)
(defvar mh-mhn-args nil
"Extra arguments to have \\[mh-edit-mhn] pass to the \"mhn\" command.
The arguments are passed to mhn if \\[mh-edit-mhn] is given a
prefix argument. Normally default arguments to mhn are specified in the
MH profile.")
(defvar mh-edit-mhn-hook nil
"Invoked on the formatted letter by \\<mh-letter-mode-map>\\[mh-edit-mhn].")
(defvar mh-mime-content-types
'(("text/plain") ("text/richtext")
("multipart/mixed") ("multipart/alternative") ("multipart/digest")
("multipart/parallel")
("message/rfc822") ("message/partial") ("message/external-body")
("application/octet-stream") ("application/postscript")
("image/jpeg") ("image/gif")
("audio/basic")
("video/mpeg"))
"Legal MIME content types. See documentation for \\[mh-edit-mhn].")
(defun mh-mhn-compose-insertion (filename type description attributes)
"Add a directive to insert a MIME message part from a file.
This is the typical way to insert non-text parts in a message.
Arguments are FILENAME, which tells where to find the file, TYPE, the
MIME content type, and DESCRIPTION, a line of text for the
Content-description header. See also \\[mh-edit-mhn]."
(interactive (let ((filename (read-file-name "Insert contents of: ")))
(list
filename
(completing-read "Content-type: "
mh-mime-content-types nil nil nil)
(read-string "Content-description: ")
(read-string "Content-Attributes: "
(concat "name=\""
(file-name-nondirectory filename)
"\"")))))
(mh-mhn-compose-type filename type description attributes ))
(defun mh-mhn-compose-type (filename type
&optional description attributes comment)
(beginning-of-line)
(insert "#" type)
(and attributes
(insert "; " attributes))
(and comment
(insert " (" comment ")"))
(insert " [")
(and description
(insert description))
(insert "] " (expand-file-name filename))
(insert "\n"))
(defun mh-mhn-compose-anon-ftp (host filename type description)
"Add a directive for a MIME anonymous ftp external body part.
This directive tells MH to include a reference to a
message/external-body part retrievable by anonymous FTP. Arguments
are HOST and FILENAME, which tell where to find the file, TYPE, the
MIME content type, and DESCRIPTION, a line of text for the
Content-description header. See also \\[mh-edit-mhn]."
(interactive (list
(read-string "Remote host: ")
(read-string "Remote filename: ")
(completing-read "External Content-type: "
mh-mime-content-types nil nil nil)
(read-string "External Content-description: ")))
(mh-mhn-compose-external-type "anon-ftp" host filename
type description))
(defun mh-mhn-compose-external-compressed-tar (host filename description)
"Add a directive to include a MIME reference to a compressed tar file.
The file should be available via anonymous ftp. This directive
tells MH to include a reference to a message/external-body part.
Arguments are HOST and FILENAME, which tell where to find the file, and
DESCRIPTION, a line of text for the Content-description header.
See also \\[mh-edit-mhn]."
(interactive (list
(read-string "Remote host: ")
(read-string "Remote filename: ")
(read-string "Tar file Content-description: ")))
(mh-mhn-compose-external-type "anon-ftp" host filename
"application/octet-stream"
description
"type=tar; conversions=x-compress"
"mode=image"))
(defun mh-mhn-compose-external-type (access-type host filename type
&optional description
attributes extra-params comment)
(beginning-of-line)
(insert "#@" type)
(and attributes
(insert "; " attributes))
(and comment
(insert " (" comment ") "))
(insert " [")
(and description
(insert description))
(insert "] ")
(insert "access-type=" access-type "; ")
(insert "site=" host)
(insert "; name=" (file-name-nondirectory filename))
(insert "; directory=\"" (file-name-directory filename) "\"")
(and extra-params
(insert "; " extra-params))
(insert "\n"))
(defun mh-mhn-compose-forw (&optional description folder messages)
"Add a forw directive to this message, to forward a message with MIME.
This directive tells MH to include the named messages in this one.
Arguments are DESCRIPTION, a line of text for the Content-description header,
and FOLDER and MESSAGES, which name the message(s) to be forwarded.
See also \\[mh-edit-mhn]."
(interactive (list
(read-string "Forw Content-description: ")
(mh-prompt-for-folder "Message from" mh-sent-from-folder nil)
(read-string (format "Messages%s: "
(if mh-sent-from-msg
(format " [%d]" mh-sent-from-msg)
"")))))
(beginning-of-line)
(insert "#forw [")
(and description
(not (string= description ""))
(insert description))
(insert "]")
(and folder
(not (string= folder ""))
(insert " " folder))
(if (and messages
(not (string= messages "")))
(let ((start (point)))
(insert " " messages)
(subst-char-in-region start (point) ?, ? ))
(if mh-sent-from-msg
(insert " " (int-to-string mh-sent-from-msg))))
(insert "\n"))
(defun mh-edit-mhn (&optional extra-args)
"Format the current draft for MIME, expanding any mhn directives.
Process the current draft with the mhn program, which,
using directives already inserted in the draft, fills in
all the MIME components and header fields.
This step should be done last just before sending the message.
The mhn program is part of MH version 6.8 or later.
The `\\[mh-revert-mhn-edit]' command undoes this command.
The arguments in the list `mh-mhn-args' are passed to mhn
if this function is passed an argument.
For assistance with creating mhn directives to insert
various types of components in a message, see
\\[mh-mhn-compose-insertion] (generic insertion from a file),
\\[mh-mhn-compose-anon-ftp] (external reference to file via anonymous ftp),
\\[mh-mhn-compose-external-compressed-tar] \
\(reference to compressed tar file via anonymous ftp), and
\\[mh-mhn-compose-forw] (forward message)."
(interactive "*P")
(save-buffer)
(message "mhn editing...")
(mh-exec-cmd-error (format "mhdraft=%s" buffer-file-name)
"mhn" (if extra-args mh-mhn-args) buffer-file-name)
(revert-buffer t t)
(message "mhn editing...done")
(run-hooks 'mh-edit-mhn-hook))
(defun mh-revert-mhn-edit (noconfirm)
"Undoes the effect of \\[mh-edit-mhn] by reverting to the backup file.
Optional non-nil argument means don't ask for confirmation."
(interactive "*P")
(if (null buffer-file-name)
(error "Buffer does not seem to be associated with any file"))
(let ((backup-strings '("," "#"))
backup-file)
(while (and backup-strings
(not (file-exists-p
(setq backup-file
(concat (file-name-directory buffer-file-name)
(car backup-strings)
(file-name-nondirectory buffer-file-name)
".orig")))))
(setq backup-strings (cdr backup-strings)))
(or backup-strings
(error "mhn backup file for %s no longer exists!" buffer-file-name))
(or noconfirm
(yes-or-no-p (format "Revert buffer from file %s? "
backup-file))
(error "mhn edit revert not confirmed"))
(let ((buffer-read-only nil))
(erase-buffer)
(insert-file-contents backup-file))
(after-find-file nil)))