Fix paren typo in the 'junk handling.

[gnus] / lisp / message.el

;;; message.el --- composing mail and news messages

;; Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: mail, news

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This mode provides mail-sending facilities from within Emacs.  It
;; consists mainly of large chunks of code from the sendmail.el,
;; gnus-msg.el and rnewspost.el files.

;;; Code:

(eval-and-compile
  (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
(eval-when-compile
  (require 'cl))

(require 'mailheader)
(require 'gmm-utils)
(require 'mail-utils)
;; Only for the trivial macros mail-header-from, mail-header-date
;; mail-header-references, mail-header-subject, mail-header-id
(eval-when-compile (require 'nnheader))
;; This is apparently necessary even though things are autoloaded.
;; Because we dynamically bind mail-abbrev-mode-regexp, we'd better
;; require mailabbrev here.
(if (featurep 'xemacs)
    (require 'mail-abbrevs)
  (require 'mailabbrev))
(require 'mail-parse)
(require 'mml)
(require 'rfc822)

(autoload 'mailclient-send-it "mailclient") ;; Emacs 22 or contrib/

(defvar gnus-message-group-art)
(defvar gnus-list-identifiers) ; gnus-sum is required where necessary
(defvar rmail-enable-mime-composing)

(defgroup message '((user-mail-address custom-variable)
                    (user-full-name custom-variable))
  "Mail and news message composing."
  :link '(custom-manual "(message)Top")
  :group 'mail
  :group 'news)

(put 'user-mail-address 'custom-type 'string)
(put 'user-full-name 'custom-type 'string)

(defgroup message-various nil
  "Various Message Variables."
  :link '(custom-manual "(message)Various Message Variables")
  :group 'message)

(defgroup message-buffers nil
  "Message Buffers."
  :link '(custom-manual "(message)Message Buffers")
  :group 'message)

(defgroup message-sending nil
  "Message Sending."
  :link '(custom-manual "(message)Sending Variables")
  :group 'message)

(defgroup message-interface nil
  "Message Interface."
  :link '(custom-manual "(message)Interface")
  :group 'message)

(defgroup message-forwarding nil
  "Message Forwarding."
  :link '(custom-manual "(message)Forwarding")
  :group 'message-interface)

(defgroup message-insertion nil
  "Message Insertion."
  :link '(custom-manual "(message)Insertion")
  :group 'message)

(defgroup message-headers nil
  "Message Headers."
  :link '(custom-manual "(message)Message Headers")
  :group 'message)

(defgroup message-news nil
  "Composing News Messages."
  :group 'message)

(defgroup message-mail nil
  "Composing Mail Messages."
  :group 'message)

(defgroup message-faces nil
  "Faces used for message composing."
  :group 'message
  :group 'faces)

(defcustom message-directory "~/Mail/"
  "*Directory from which all other mail file variables are derived."
  :group 'message-various
  :type 'directory)

(defcustom message-max-buffers 10
  "*How many buffers to keep before starting to kill them off."
  :group 'message-buffers
  :type 'integer)

(defcustom message-send-rename-function nil
  "Function called to rename the buffer after sending it."
  :group 'message-buffers
  :type '(choice function (const nil)))

(defcustom message-fcc-handler-function 'message-output
  "*A function called to save outgoing articles.
This function will be called with the name of the file to store the
article in.  The default function is `message-output' which saves in Unix
mailbox format."
  :type '(radio (function-item message-output)
                (function :tag "Other"))
  :group 'message-sending)

(defcustom message-fcc-externalize-attachments nil
  "If non-nil, attachments are included as external parts in Fcc copies."
  :version "22.1"
  :type 'boolean
  :group 'message-sending)

(defcustom message-courtesy-message
  "The following message is a courtesy copy of an article\nthat has been posted to %s as well.\n\n"
  "*This is inserted at the start of a mailed copy of a posted message.
If the string contains the format spec \"%s\", the Newsgroups
the article has been posted to will be inserted there.
If this variable is nil, no such courtesy message will be added."
  :group 'message-sending
  :type '(radio string (const nil)))

(defcustom message-ignored-bounced-headers
  "^\\(Received\\|Return-Path\\|Delivered-To\\):"
  "*Regexp that matches headers to be removed in resent bounced mail."
  :group 'message-interface
  :type 'regexp)

(defcustom message-from-style 'default
  "*Specifies how \"From\" headers look.

If nil, they contain just the return address like:
        king@grassland.com
If `parens', they look like:
        king@grassland.com (Elvis Parsley)
If `angles', they look like:
        Elvis Parsley <king@grassland.com>

Otherwise, most addresses look like `angles', but they look like
`parens' if `angles' would need quoting and `parens' would not."
  :version "23.2"
  :type '(choice (const :tag "simple" nil)
                 (const parens)
                 (const angles)
                 (const default))
  :group 'message-headers)

(defcustom message-insert-canlock t
  "Whether to insert a Cancel-Lock header in news postings."
  :version "22.1"
  :group 'message-headers
  :type 'boolean)

(defcustom message-syntax-checks
  (if message-insert-canlock '((sender . disabled)) nil)
  ;; Guess this one shouldn't be easy to customize...
  "*Controls what syntax checks should not be performed on outgoing posts.
To disable checking of long signatures, for instance, add
 `(signature . disabled)' to this list.

Don't touch this variable unless you really know what you're doing.

Checks include `approved', `bogus-recipient', `continuation-headers',
`control-chars', `empty', `existing-newsgroups', `from', `illegible-text',
`invisible-text', `long-header-lines', `long-lines', `message-id',
`multiple-headers', `new-text', `newsgroups', `quoting-style',
`repeated-newsgroups', `reply-to', `sender', `sendsys', `shoot',
`shorten-followup-to', `signature', `size', `subject', `subject-cmsg'
and `valid-newsgroups'."
  :group 'message-news
  :type '(repeat sexp))                 ; Fixme: improve this

(defcustom message-required-headers '((optional . References)
                                      From)
  "*Headers to be generated or prompted for when sending a message.
Also see `message-required-news-headers' and
`message-required-mail-headers'."
  :version "22.1"
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(repeat sexp))

(defcustom message-draft-headers '(References From Date)
  "*Headers to be generated when saving a draft message."
  :version "22.1"
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(repeat sexp))

(defcustom message-required-news-headers
  '(From Newsgroups Subject Date Message-ID
         (optional . Organization)
         (optional . User-Agent))
  "*Headers to be generated or prompted for when posting an article.
RFC977 and RFC1036 require From, Date, Newsgroups, Subject,
Message-ID.  Organization, Lines, In-Reply-To, Expires, and
User-Agent are optional.  If you don't want message to insert some
header, remove it from this list."
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(repeat sexp))

(defcustom message-required-mail-headers
  '(From Subject Date (optional . In-Reply-To) Message-ID
         (optional . User-Agent))
  "*Headers to be generated or prompted for when mailing a message.
It is recommended that From, Date, To, Subject and Message-ID be
included.  Organization and User-Agent are optional."
  :group 'message-mail
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(repeat sexp))

(defcustom message-prune-recipient-rules nil
  "Rules for how to prune the list of recipients when doing wide replies.
This is a list of regexps and regexp matches."
  :version "24.1"
  :group 'message-mail
  :group 'message-headers
  :link '(custom-manual "(message)Wide Reply")
  :type '(repeat regexp))

(defcustom message-deletable-headers '(Message-ID Date Lines)
  "Headers to be deleted if they already exist and were generated by message previously."
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type 'sexp)

(defcustom message-ignored-news-headers
  "^NNTP-Posting-Host:\\|^Xref:\\|^[BGF]cc:\\|^Resent-Fcc:\\|^X-Draft-From:\\|^X-Gnus-Agent-Meta-Information:"
  "*Regexp of headers to be removed unconditionally before posting."
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(repeat :value-to-internal (lambda (widget value)
                                      (custom-split-regexp-maybe value))
                 :match (lambda (widget value)
                          (or (stringp value)
                              (widget-editable-list-match widget value)))
                 regexp))

(defcustom message-ignored-mail-headers
  "^[GF]cc:\\|^Resent-Fcc:\\|^Xref:\\|^X-Draft-From:\\|^X-Gnus-Agent-Meta-Information:"
  "*Regexp of headers to be removed unconditionally before mailing."
  :group 'message-mail
  :group 'message-headers
  :link '(custom-manual "(message)Mail Headers")
  :type 'regexp)

(defcustom message-ignored-supersedes-headers "^Path:\\|^Date\\|^NNTP-Posting-Host:\\|^Xref:\\|^Lines:\\|^Received:\\|^X-From-Line:\\|^X-Trace:\\|^X-ID:\\|^X-Complaints-To:\\|Return-Path:\\|^Supersedes:\\|^NNTP-Posting-Date:\\|^X-Trace:\\|^X-Complaints-To:\\|^Cancel-Lock:\\|^Cancel-Key:\\|^X-Hashcash:\\|^X-Payment:\\|^Approved:"
  "*Header lines matching this regexp will be deleted before posting.
It's best to delete old Path and Date headers before posting to avoid
any confusion."
  :group 'message-interface
  :link '(custom-manual "(message)Superseding")
  :type '(repeat :value-to-internal (lambda (widget value)
                                      (custom-split-regexp-maybe value))
                 :match (lambda (widget value)
                          (or (stringp value)
                              (widget-editable-list-match widget value)))
                 regexp))

(defcustom message-subject-re-regexp
  "^[ \t]*\\([Rr][Ee]\\(\\[[0-9]*\\]\\)*:[ \t]*\\)*[ \t]*"
  "*Regexp matching \"Re: \" in the subject line."
  :group 'message-various
  :link '(custom-manual "(message)Message Headers")
  :type 'regexp)

;;; Start of variables adopted from `message-utils.el'.

(defcustom message-subject-trailing-was-query 'ask
  "*What to do with trailing \"(was: <old subject>)\" in subject lines.
If nil, leave the subject unchanged.  If it is the symbol `ask', query
the user what do do.  In this case, the subject is matched against
`message-subject-trailing-was-ask-regexp'.  If
`message-subject-trailing-was-query' is t, always strip the trailing
old subject.  In this case, `message-subject-trailing-was-regexp' is
used."
  :version "22.1"
  :type '(choice (const :tag "never" nil)
                 (const :tag "always strip" t)
                 (const ask))
  :link '(custom-manual "(message)Message Headers")
  :group 'message-various)

(defcustom message-subject-trailing-was-ask-regexp
  "[ \t]*\\([[(]+[Ww][Aa][Ss][ \t]*.*[\])]+\\)"
  "*Regexp matching \"(was: <old subject>)\" in the subject line.

The function `message-strip-subject-trailing-was' uses this regexp if
`message-subject-trailing-was-query' is set to the symbol `ask'.  If
the variable is t instead of `ask', use
`message-subject-trailing-was-regexp' instead.

It is okay to create some false positives here, as the user is asked."
  :version "22.1"
  :group 'message-various
  :link '(custom-manual "(message)Message Headers")
  :type 'regexp)

(defcustom message-subject-trailing-was-regexp
  "[ \t]*\\((*[Ww][Aa][Ss]:[ \t]*.*)\\)"
  "*Regexp matching \"(was: <old subject>)\" in the subject line.

If `message-subject-trailing-was-query' is set to t, the subject is
matched against `message-subject-trailing-was-regexp' in
`message-strip-subject-trailing-was'.  You should use a regexp creating very
few false positives here."
  :version "22.1"
  :group 'message-various
  :link '(custom-manual "(message)Message Headers")
  :type 'regexp)

;;; marking inserted text

(defcustom message-mark-insert-begin
  "--8<---------------cut here---------------start------------->8---\n"
  "How to mark the beginning of some inserted text."
  :version "22.1"
  :type 'string
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-various)

(defcustom message-mark-insert-end
  "--8<---------------cut here---------------end--------------->8---\n"
  "How to mark the end of some inserted text."
  :version "22.1"
  :type 'string
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-various)

(defcustom message-archive-header "X-No-Archive: Yes\n"
  "Header to insert when you don't want your article to be archived.
Archives \(such as groups.google.com\) respect this header."
  :version "22.1"
  :type 'string
  :link '(custom-manual "(message)Header Commands")
  :group 'message-various)

(defcustom message-archive-note
  "X-No-Archive: Yes - save http://groups.google.com/"
  "Note to insert why you wouldn't want this posting archived.
If nil, don't insert any text in the body."
  :version "22.1"
  :type '(radio string (const nil))
  :link '(custom-manual "(message)Header Commands")
  :group 'message-various)

;;; Crossposts and Followups
;; inspired by JoH-followup-to by Jochem Huhman <joh  at gmx.de>
;; new suggestions by R. Weikusat <rw at another.de>

(defvar message-cross-post-old-target nil
  "Old target for cross-posts or follow-ups.")
(make-variable-buffer-local 'message-cross-post-old-target)

(defcustom message-cross-post-default t
  "When non-nil `message-cross-post-followup-to' will perform a crosspost.
If nil, `message-cross-post-followup-to' will only do a followup.  Note that
you can explicitly override this setting by calling
`message-cross-post-followup-to' with a prefix."
  :version "22.1"
  :type 'boolean
  :group 'message-various)

(defcustom message-cross-post-note "Crosspost & Followup-To: "
  "Note to insert before signature to notify of cross-post and follow-up."
  :version "22.1"
  :type 'string
  :group 'message-various)

(defcustom message-followup-to-note "Followup-To: "
  "Note to insert before signature to notify of follow-up only."
  :version "22.1"
  :type 'string
  :group 'message-various)

(defcustom message-cross-post-note-function 'message-cross-post-insert-note
  "Function to use to insert note about Crosspost or Followup-To.
The function will be called with four arguments.  The function should not only
insert a note, but also ensure old notes are deleted.  See the documentation
for `message-cross-post-insert-note'."
  :version "22.1"
  :type 'function
  :group 'message-various)

;;; End of variables adopted from `message-utils.el'.

(defcustom message-signature-separator "^-- $"
  "Regexp matching the signature separator.
This variable is used to strip off the signature from quoted text
when `message-cite-function' is
`message-cite-original-without-signature'.  Most useful values
are \"^-- $\" (strict) and \"^-- *$\" (loose; allow missing
whitespace)."
  :type '(choice (const :tag "strict" "^-- $")
                 (const :tag "loose" "^-- *$")
                 regexp)
  :version "22.3" ;; Gnus 5.10.12 (changed default)
  :link '(custom-manual "(message)Various Message Variables")
  :group 'message-various)

(defcustom message-elide-ellipsis "\n[...]\n\n"
  "*The string which is inserted for elided text."
  :type 'string
  :link '(custom-manual "(message)Various Commands")
  :group 'message-various)

(defcustom message-interactive t
  "Non-nil means when sending a message wait for and display errors.
A value of nil means let mailer mail back a message to report errors."
  :version "23.2"
  :group 'message-sending
  :group 'message-mail
  :link '(custom-manual "(message)Sending Variables")
  :type 'boolean)

(defcustom message-confirm-send nil
  "When non-nil, ask for confirmation when sending a message."
  :group 'message-sending
  :group 'message-mail
  :version "23.1" ;; No Gnus
  :link '(custom-manual "(message)Sending Variables")
  :type 'boolean)

(defcustom message-generate-new-buffers 'unsent
  "*Say whether to create a new message buffer to compose a message.
Valid values include:

nil
  Generate the buffer name in the Message way (e.g., *mail*, *news*,
  *mail to whom*, *news on group*, etc.) and continue editing in the
  existing buffer of that name.  If there is no such buffer, it will
  be newly created.

`unique' or t
  Create the new buffer with the name generated in the Message way.

`unsent'
  Similar to `unique' but the buffer name begins with \"*unsent \".

`standard'
  Similar to nil but the buffer name is simpler like *mail message*.

function
  If this is a function, call that function with three parameters:
  The type, the To address and the group name (any of these may be nil).
  The function should return the new buffer name."
  :version "24.1"
  :group 'message-buffers
  :link '(custom-manual "(message)Message Buffers")
  :type '(choice (const nil)
                 (sexp :tag "unique" :format "unique\n" :value unique
                       :match (lambda (widget value) (memq value '(unique t))))
                 (const unsent)
                 (const standard)
                 (function :format "\n    %{%t%}: %v")))

(defcustom message-kill-buffer-on-exit nil
  "*Non-nil means that the message buffer will be killed after sending a message."
  :group 'message-buffers
  :link '(custom-manual "(message)Message Buffers")
  :type 'boolean)

(defcustom message-kill-buffer-query t
  "*Non-nil means that killing a modified message buffer has to be confirmed.
This is used by `message-kill-buffer'."
  :version "23.1" ;; No Gnus
  :group 'message-buffers
  :type 'boolean)

(defvar gnus-local-organization)
(defcustom message-user-organization
  (or (and (boundp 'gnus-local-organization)
           (stringp gnus-local-organization)
           gnus-local-organization)
      (getenv "ORGANIZATION")
      t)
  "*String to be used as an Organization header.
If t, use `message-user-organization-file'."
  :group 'message-headers
  :type '(choice string
                 (const :tag "consult file" t)))

(defcustom message-user-organization-file
  (let (orgfile)
    (dolist (f (list "/etc/organization"
                     "/etc/news/organization"
                     "/usr/lib/news/organization"))
      (when (file-readable-p f)
        (setq orgfile f)))
    orgfile)
  "*Local news organization file."
  :type 'file
  :link '(custom-manual "(message)News Headers")
  :group 'message-headers)

(defcustom message-make-forward-subject-function
  #'message-forward-subject-name-subject
  "*List of functions called to generate subject headers for forwarded messages.
The subject generated by the previous function is passed into each
successive function.

The provided functions are:

* `message-forward-subject-author-subject' Source of article (author or
      newsgroup), in brackets followed by the subject
* `message-forward-subject-name-subject' Source of article (name of author
      or newsgroup), in brackets followed by the subject
* `message-forward-subject-fwd' Subject of article with 'Fwd:' prepended
      to it."
  :group 'message-forwarding
  :link '(custom-manual "(message)Forwarding")
  :type '(radio (function-item message-forward-subject-author-subject)
                (function-item message-forward-subject-fwd)
                (function-item message-forward-subject-name-subject)
                (repeat :tag "List of functions" function)))

(defcustom message-forward-as-mime t
  "*Non-nil means forward messages as an inline/rfc822 MIME section.
Otherwise, directly inline the old message in the forwarded message."
  :version "21.1"
  :group 'message-forwarding
  :link '(custom-manual "(message)Forwarding")
  :type 'boolean)

(defcustom message-forward-show-mml 'best
  "*Non-nil means show forwarded messages as MML (decoded from MIME).
Otherwise, forwarded messages are unchanged.
Can also be the symbol `best' to indicate that MML should be
used, except when it is a bad idea to use MML.  One example where
it is a bad idea is when forwarding a signed or encrypted
message, because converting MIME to MML would invalidate the
digital signature."
  :version "21.1"
  :group 'message-forwarding
  :type '(choice (const :tag "use MML" t)
                 (const :tag "don't use MML " nil)
                 (const :tag "use MML when appropriate" best)))

(defcustom message-forward-before-signature t
  "*Non-nil means put forwarded message before signature, else after."
  :group 'message-forwarding
  :type 'boolean)

(defcustom message-wash-forwarded-subjects nil
  "*Non-nil means try to remove as much cruft as possible from the subject.
Done before generating the new subject of a forward."
  :group 'message-forwarding
  :link '(custom-manual "(message)Forwarding")
  :type 'boolean)

(defcustom message-ignored-resent-headers
  ;; `Delivered-To' needs to be removed because some mailers use it to
  ;; detect loops, so if you resend a message to an address that ultimately
  ;; comes back to you (e.g. a mailing-list to which you subscribe, in which
  ;; case you may be removed from the list on the grounds that mail to you
  ;; bounced with a "mailing loop" error).
  "^Return-receipt\\|^X-Gnus\\|^Gnus-Warning:\\|^>?From \\|^Delivered-To:"
  "*All headers that match this regexp will be deleted when resending a message."
  :group 'message-interface
  :link '(custom-manual "(message)Resending")
  :type '(repeat :value-to-internal (lambda (widget value)
                                      (custom-split-regexp-maybe value))
                 :match (lambda (widget value)
                          (or (stringp value)
                              (widget-editable-list-match widget value)))
                 regexp))

(defcustom message-forward-ignored-headers "^Content-Transfer-Encoding:\\|^X-Gnus"
  "*All headers that match this regexp will be deleted when forwarding a message."
  :version "21.1"
  :group 'message-forwarding
  :type '(repeat :value-to-internal (lambda (widget value)
                                      (custom-split-regexp-maybe value))
                 :match (lambda (widget value)
                          (or (stringp value)
                              (widget-editable-list-match widget value)))
                 regexp))

(defcustom message-ignored-cited-headers "."
  "*Delete these headers from the messages you yank."
  :group 'message-insertion
  :link '(custom-manual "(message)Insertion Variables")
  :type 'regexp)

(defcustom message-cite-prefix-regexp
  (if (string-match "[[:digit:]]" "1")
      ;; Support POSIX?  XEmacs 21.5.27 doesn't.
      "\\([ \t]*[_.[:word:]]+>+\\|[ \t]*[]>|}]\\)+"
    ;; ?-, ?_ or ?. MUST NOT be in syntax entry w.
    (let (non-word-constituents)
      (with-syntax-table text-mode-syntax-table
        (setq non-word-constituents
              (concat
               (if (string-match "\\w" "_")  "" "_")
               (if (string-match "\\w" ".")  "" "."))))
      (if (equal non-word-constituents "")
          "\\([ \t]*\\(\\w\\)+>+\\|[ \t]*[]>|}]\\)+"
        (concat "\\([ \t]*\\(\\w\\|["
                non-word-constituents
                "]\\)+>+\\|[ \t]*[]>|}]\\)+"))))
  "*Regexp matching the longest possible citation prefix on a line."
  :version "23.2"
  :group 'message-insertion
  :link '(custom-manual "(message)Insertion Variables")
  :type 'regexp
  :set (lambda (symbol value)
         (prog1
             (custom-set-default symbol value)
           (if (boundp 'gnus-message-cite-prefix-regexp)
               (setq gnus-message-cite-prefix-regexp
                     (concat "^\\(?:" value "\\)"))))))

(defcustom message-cancel-message "I am canceling my own article.\n"
  "Message to be inserted in the cancel message."
  :group 'message-interface
  :link '(custom-manual "(message)Canceling News")
  :type 'string)

(defun message-send-mail-function ()
  "Return suitable value for the variable `message-send-mail-function'."
  (cond ((and (require 'sendmail)
              (boundp 'sendmail-program)
              sendmail-program
              (executable-find sendmail-program))
         'message-send-mail-with-sendmail)
        ((and (locate-library "smtpmail")
              (boundp 'smtpmail-default-smtp-server)
              smtpmail-default-smtp-server)
         'message-smtpmail-send-it)
        ((locate-library "mailclient")
         'message-send-mail-with-mailclient)
        (t
         (error "Don't know how to send mail.  Please customize `message-send-mail-function'"))))

;; Useful to set in site-init.el
(defcustom message-send-mail-function
  (cond ((eq send-mail-function 'smtpmail-send-it) 'message-smtpmail-send-it)
        ((eq send-mail-function 'feedmail-send-it) 'feedmail-send-it)
        ((eq send-mail-function 'mailclient-send-it)
         'message-send-mail-with-mailclient)
        (t (message-send-mail-function)))
  "Function to call to send the current buffer as mail.
The headers should be delimited by a line whose contents match the
variable `mail-header-separator'.

Valid values include `message-send-mail-with-sendmail'
`message-send-mail-with-mh', `message-send-mail-with-qmail',
`message-smtpmail-send-it', `smtpmail-send-it',
`feedmail-send-it' and `message-send-mail-with-mailclient'.  The
default is system dependent and determined by the function
`message-send-mail-function'.

See also `send-mail-function'."
  :type '(radio (function-item message-send-mail-with-sendmail)
                (function-item message-send-mail-with-mh)
                (function-item message-send-mail-with-qmail)
                (function-item message-smtpmail-send-it)
                (function-item smtpmail-send-it)
                (function-item feedmail-send-it)
                (function-item message-send-mail-with-mailclient
                               :tag "Use Mailclient package")
                (function :tag "Other"))
  :group 'message-sending
  :version "23.2"
  :initialize 'custom-initialize-default
  :link '(custom-manual "(message)Mail Variables")
  :group 'message-mail)

(defcustom message-send-news-function 'message-send-news
  "Function to call to send the current buffer as news.
The headers should be delimited by a line whose contents match the
variable `mail-header-separator'."
  :group 'message-sending
  :group 'message-news
  :link '(custom-manual "(message)News Variables")
  :type 'function)

(defcustom message-reply-to-function nil
  "If non-nil, function that should return a list of headers.
This function should pick out addresses from the To, Cc, and From headers
and respond with new To and Cc headers."
  :group 'message-interface
  :link '(custom-manual "(message)Reply")
  :type '(choice function (const nil)))

(defcustom message-wide-reply-to-function nil
  "If non-nil, function that should return a list of headers.
This function should pick out addresses from the To, Cc, and From headers
and respond with new To and Cc headers."
  :group 'message-interface
  :link '(custom-manual "(message)Wide Reply")
  :type '(choice function (const nil)))

(defcustom message-followup-to-function nil
  "If non-nil, function that should return a list of headers.
This function should pick out addresses from the To, Cc, and From headers
and respond with new To and Cc headers."
  :group 'message-interface
  :link '(custom-manual "(message)Followup")
  :type '(choice function (const nil)))

(defcustom message-extra-wide-headers nil
  "If non-nil, a list of additional address headers.
These are used when composing a wide reply."
  :group 'message-sending
  :type '(repeat string))

(defcustom message-use-followup-to 'ask
  "*Specifies what to do with Followup-To header.
If nil, always ignore the header.  If it is t, use its value, but
query before using the \"poster\" value.  If it is the symbol `ask',
always query the user whether to use the value.  If it is the symbol
`use', always use the value."
  :group 'message-interface
  :link '(custom-manual "(message)Followup")
  :type '(choice (const :tag "ignore" nil)
                 (const :tag "use & query" t)
                 (const use)
                 (const ask)))

(defcustom message-use-mail-followup-to 'use
  "*Specifies what to do with Mail-Followup-To header.
If nil, always ignore the header.  If it is the symbol `ask', always
query the user whether to use the value.  If it is the symbol `use',
always use the value."
  :version "22.1"
  :group 'message-interface
  :link '(custom-manual "(message)Mailing Lists")
  :type '(choice (const :tag "ignore" nil)
                 (const use)
                 (const ask)))

(defcustom message-subscribed-address-functions nil
  "*Specifies functions for determining list subscription.
If nil, do not attempt to determine list subscription with functions.
If non-nil, this variable contains a list of functions which return
regular expressions to match lists.  These functions can be used in
conjunction with `message-subscribed-regexps' and
`message-subscribed-addresses'."
  :version "22.1"
  :group 'message-interface
  :link '(custom-manual "(message)Mailing Lists")
  :type '(repeat sexp))

(defcustom message-subscribed-address-file nil
  "*A file containing addresses the user is subscribed to.
If nil, do not look at any files to determine list subscriptions.  If
non-nil, each line of this file should be a mailing list address."
  :version "22.1"
  :group 'message-interface
  :link '(custom-manual "(message)Mailing Lists")
  :type '(radio file (const nil)))

(defcustom message-subscribed-addresses nil
  "*Specifies a list of addresses the user is subscribed to.
If nil, do not use any predefined list subscriptions.  This list of
addresses can be used in conjunction with
`message-subscribed-address-functions' and `message-subscribed-regexps'."
  :version "22.1"
  :group 'message-interface
  :link '(custom-manual "(message)Mailing Lists")
  :type '(repeat string))

(defcustom message-subscribed-regexps nil
  "*Specifies a list of addresses the user is subscribed to.
If nil, do not use any predefined list subscriptions.  This list of
regular expressions can be used in conjunction with
`message-subscribed-address-functions' and `message-subscribed-addresses'."
  :version "22.1"
  :group 'message-interface
  :link '(custom-manual "(message)Mailing Lists")
  :type '(repeat regexp))

(defcustom message-allow-no-recipients 'ask
  "Specifies what to do when there are no recipients other than Gcc/Fcc.
If it is the symbol `always', the posting is allowed.  If it is the
symbol `never', the posting is not allowed.  If it is the symbol
`ask', you are prompted."
  :version "22.1"
  :group 'message-interface
  :link '(custom-manual "(message)Message Headers")
  :type '(choice (const always)
                 (const never)
                 (const ask)))

(defcustom message-sendmail-f-is-evil nil
  "*Non-nil means don't add \"-f username\" to the sendmail command line.
Doing so would be even more evil than leaving it out."
  :group 'message-sending
  :link '(custom-manual "(message)Mail Variables")
  :type 'boolean)

(defcustom message-sendmail-envelope-from nil
  "*Envelope-from when sending mail with sendmail.
If this is nil, use `user-mail-address'.  If it is the symbol
`header', use the From: header of the message."
  :version "23.2"
  :type '(choice (string :tag "From name")
                 (const :tag "Use From: header from message" header)
                 (const :tag "Use `user-mail-address'" nil))
  :link '(custom-manual "(message)Mail Variables")
  :group 'message-sending)

(defcustom message-sendmail-extra-arguments nil
  "Additional arguments to `sendmail-program'."
  ;; E.g. '("-a" "account") for msmtp
  :version "23.1" ;; No Gnus
  :type '(repeat string)
  ;; :link '(custom-manual "(message)Mail Variables")
  :group 'message-sending)

;; qmail-related stuff
(defcustom message-qmail-inject-program "/var/qmail/bin/qmail-inject"
  "Location of the qmail-inject program."
  :group 'message-sending
  :link '(custom-manual "(message)Mail Variables")
  :type 'file)

(defcustom message-qmail-inject-args nil
  "Arguments passed to qmail-inject programs.
This should be a list of strings, one string for each argument.
It may also be a function.

For e.g., if you wish to set the envelope sender address so that bounces
go to the right place or to deal with listserv's usage of that address, you
might set this variable to '(\"-f\" \"you@some.where\")."
  :group 'message-sending
  :link '(custom-manual "(message)Mail Variables")
  :type '(choice (function)
                 (repeat string)))

(defvar gnus-post-method)
(defvar gnus-select-method)
(defcustom message-post-method
  (cond ((and (boundp 'gnus-post-method)
              (listp gnus-post-method)
              gnus-post-method)
         gnus-post-method)
        ((boundp 'gnus-select-method)
         gnus-select-method)
        (t '(nnspool "")))
  "*Method used to post news.
Note that when posting from inside Gnus, for instance, this
variable isn't used."
  :group 'message-news
  :group 'message-sending
  ;; This should be the `gnus-select-method' widget, but that might
  ;; create a dependence to `gnus.el'.
  :type 'sexp)

;; FIXME: This should be a temporary workaround until someone implements a
;; proper solution.  If a crash happens while replying, the auto-save file
;; will *not* have a `References:' header if `message-generate-headers-first'
;; is nil.  See: http://article.gmane.org/gmane.emacs.gnus.general/51138
(defcustom message-generate-headers-first '(references)
  "Which headers should be generated before starting to compose a message.
If t, generate all required headers.  This can also be a list of headers to
generate.  The variables `message-required-news-headers' and
`message-required-mail-headers' specify which headers to generate.

Note that the variable `message-deletable-headers' specifies headers which
are to be deleted and then re-generated before sending, so this variable
will not have a visible effect for those headers."
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(choice (const :tag "None" nil)
                 (const :tag "References" '(references))
                 (const :tag "All" t)
                 (repeat (sexp :tag "Header"))))

(defcustom message-fill-column 72
  "Column beyond which automatic line-wrapping should happen.
Local value for message buffers.  If non-nil, also turn on
auto-fill in message buffers."
  :group 'message-various
  ;; :link '(custom-manual "(message)Message Headers")
  :type '(choice (const :tag "Don't turn on auto fill" nil)
                 (integer)))

(defcustom message-setup-hook nil
  "Normal hook, run each time a new outgoing message is initialized.
The function `message-setup' runs this hook."
  :group 'message-various
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-cancel-hook nil
  "Hook run when cancelling articles."
  :group 'message-various
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-signature-setup-hook nil
  "Normal hook, run each time a new outgoing message is initialized.
It is run after the headers have been inserted and before
the signature is inserted."
  :group 'message-various
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-mode-hook nil
  "Hook run in message mode buffers."
  :group 'message-various
  :type 'hook)

(defcustom message-header-hook nil
  "Hook run in a message mode buffer narrowed to the headers."
  :group 'message-various
  :type 'hook)

(defcustom message-header-setup-hook nil
  "Hook called narrowed to the headers when setting up a message buffer."
  :group 'message-various
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-minibuffer-local-map
  (let ((map (make-sparse-keymap 'message-minibuffer-local-map)))
    (set-keymap-parent map minibuffer-local-map)
    map)
  "Keymap for `message-read-from-minibuffer'."
  :version "22.1"
  :group 'message-various)

(defcustom message-citation-line-function 'message-insert-citation-line
  "*Function called to insert the \"Whomever writes:\" line.

Predefined functions include `message-insert-citation-line' and
`message-insert-formatted-citation-line' (see the variable
`message-citation-line-format').

Note that Gnus provides a feature where the reader can click on
`writes:' to hide the cited text.  If you change this line too much,
people who read your message will have to change their Gnus
configuration.  See the variable `gnus-cite-attribution-suffix'."
  :type '(choice
          (function-item :tag "plain" message-insert-citation-line)
          (function-item :tag "formatted" message-insert-formatted-citation-line)
          (function :tag "Other"))
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-citation-line-format "On %a, %b %d %Y, %N wrote:\n"
  "Format of the \"Whomever writes:\" line.

The string is formatted using `format-spec'.  The following
constructs are replaced:

  %f   The full From, e.g. \"John Doe <john.doe@example.invalid>\".
  %n   The mail address, e.g. \"john.doe@example.invalid\".
  %N   The real name if present, e.g.: \"John Doe\", else fall
       back to the mail address.
  %F   The first name if present, e.g.: \"John\".
  %L   The last name if present, e.g.: \"Doe\".

All other format specifiers are passed to `format-time-string'
which is called using the date from the article your replying to.
Extracting the first (%F) and last name (%L) is done
heuristically, so you should always check it yourself.

Please also read the note in the documentation of
`message-citation-line-function'."
  :type '(choice (const :tag "Plain" "%f writes:")
                 (const :tag "Include date" "On %a, %b %d %Y, %n wrote:")
                 string)
  :link '(custom-manual "(message)Insertion Variables")
  :version "23.1" ;; No Gnus
  :group 'message-insertion)

(defcustom message-yank-prefix "> "
  "*Prefix inserted on the lines of yanked messages.
Fix `message-cite-prefix-regexp' if it is set to an abnormal value.
See also `message-yank-cited-prefix' and `message-yank-empty-prefix'."
  :version "23.2"
  :type 'string
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-yank-cited-prefix ">"
  "*Prefix inserted on cited lines of yanked messages.
Fix `message-cite-prefix-regexp' if it is set to an abnormal value.
See also `message-yank-prefix' and `message-yank-empty-prefix'."
  :version "22.1"
  :type 'string
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-yank-empty-prefix ">"
  "*Prefix inserted on empty lines of yanked messages.
See also `message-yank-prefix' and `message-yank-cited-prefix'."
  :version "22.1"
  :type 'string
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-indentation-spaces 3
  "*Number of spaces to insert at the beginning of each cited line.
Used by `message-yank-original' via `message-yank-cite'."
  :version "23.2"
  :group 'message-insertion
  :link '(custom-manual "(message)Insertion Variables")
  :type 'integer)

(defcustom message-cite-function 'message-cite-original-without-signature
  "*Function for citing an original message.
Predefined functions include `message-cite-original' and
`message-cite-original-without-signature'.
Note that these functions use `mail-citation-hook' if that is non-nil."
  :type '(radio (function-item message-cite-original)
                (function-item message-cite-original-without-signature)
                (function-item sc-cite-original)
                (function :tag "Other"))
  :link '(custom-manual "(message)Insertion Variables")
  :version "22.3" ;; Gnus 5.10.12 (changed default)
  :group 'message-insertion)

(defcustom message-indent-citation-function 'message-indent-citation
  "*Function for modifying a citation just inserted in the mail buffer.
This can also be a list of functions.  Each function can find the
citation between (point) and (mark t).  And each function should leave
point and mark around the citation text as modified."
  :type 'function
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-signature t
  "*String to be inserted at the end of the message buffer.
If t, the `message-signature-file' file will be inserted instead.
If a function, the result from the function will be used instead.
If a form, the result from the form will be used instead."
  :version "23.2"
  :type 'sexp
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-signature-file "~/.signature"
  "*Name of file containing the text inserted at end of message buffer.
Ignored if the named file doesn't exist.
If nil, don't insert a signature.
If a path is specified, the value of `message-signature-directory' is ignored,
even if set."
  :version "23.2"
  :type '(choice file (const :tags "None" nil))
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-signature-directory nil
  "*Name of directory containing signature files.
Comes in handy if you have many such files, handled via posting styles for
instance.
If nil, `message-signature-file' is expected to specify the directory if
needed."
  :type '(choice string (const :tags "None" nil))
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-signature-insert-empty-line t
  "*If non-nil, insert an empty line before the signature separator."
  :version "22.1"
  :type 'boolean
  :link '(custom-manual "(message)Insertion Variables")
  :group 'message-insertion)

(defcustom message-distribution-function nil
  "*Function called to return a Distribution header."
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)News Headers")
  :type '(choice function (const nil)))

(defcustom message-expires 14
  "Number of days before your article expires."
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)News Headers")
  :type 'integer)

(defcustom message-user-path nil
  "If nil, use the NNTP server name in the Path header.
If stringp, use this; if non-nil, use no host name (user name only)."
  :group 'message-news
  :group 'message-headers
  :link '(custom-manual "(message)News Headers")
  :type '(choice (const :tag "nntp" nil)
                 (string :tag "name")
                 (sexp :tag "none" :format "%t" t)))

;; This can be the name of a buffer, or a cons cell (FUNCTION . ARGS)
;; for yanking the original buffer.
(defvar message-reply-buffer nil)
(defvar message-reply-headers nil
  "The headers of the current replied article.
It is a vector of the following headers:
\[number subject from date id references chars lines xref extra].")
(defvar message-newsreader nil)
(defvar message-mailer nil)
(defvar message-sent-message-via nil)
(defvar message-checksum nil)
(defvar message-send-actions nil
  "A list of actions to be performed upon successful sending of a message.")
(defvar message-exit-actions nil
  "A list of actions to be performed upon exiting after sending a message.")
(defvar message-kill-actions nil
  "A list of actions to be performed before killing a message buffer.")
(defvar message-postpone-actions nil
  "A list of actions to be performed after postponing a message.")

(define-widget 'message-header-lines 'text
  "All header lines must be LFD terminated."
  :format "%{%t%}:%n%v"
  :valid-regexp "^\\'"
  :error "All header lines must be newline terminated")

(defcustom message-default-headers ""
  "*A string containing header lines to be inserted in outgoing messages.
It is inserted before you edit the message, so you can edit or delete
these lines."
  :version "23.2"
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type 'message-header-lines)

(defcustom message-default-mail-headers
  ;; Ease the transition from mail-mode to message-mode.  See bugs#4431, 5555.
  (concat (if (and (boundp 'mail-default-reply-to)
                   (stringp mail-default-reply-to))
              (format "Reply-to: %s\n" mail-default-reply-to))
          (if (and (boundp 'mail-self-blind)
                   mail-self-blind)
              (format "BCC: %s\n" user-mail-address))
          (if (and (boundp 'mail-archive-file-name)
                   (stringp mail-archive-file-name))
              (format "FCC: %s\n" mail-archive-file-name))
          ;; Use the value of `mail-default-headers' if available.
          ;; Note: as for Emacs 21, XEmacs 21.4 and 21.5, it is
          ;; unavailable unless sendmail.el is loaded.
          (if (boundp 'mail-default-headers)
              mail-default-headers))
  "*A string of header lines to be inserted in outgoing mails."
  :version "23.2"
  :group 'message-headers
  :group 'message-mail
  :link '(custom-manual "(message)Mail Headers")
  :type 'message-header-lines)

(defcustom message-default-news-headers ""
  "*A string of header lines to be inserted in outgoing news articles."
  :group 'message-headers
  :group 'message-news
  :link '(custom-manual "(message)News Headers")
  :type 'message-header-lines)

;; Note: could use /usr/ucb/mail instead of sendmail;
;; options -t, and -v if not interactive.
(defcustom message-mailer-swallows-blank-line
  (if (and (string-match "sparc-sun-sunos\\(\\'\\|[^5]\\)"
                         system-configuration)
           (file-readable-p "/etc/sendmail.cf")
           (let ((buffer (get-buffer-create " *temp*")))
             (unwind-protect
                 (with-current-buffer buffer
                   (insert-file-contents "/etc/sendmail.cf")
                   (goto-char (point-min))
                   (let ((case-fold-search nil))
                     (re-search-forward "^OR\\>" nil t)))
               (kill-buffer buffer))))
      ;; According to RFC822, "The field-name must be composed of printable
      ;; ASCII characters (i. e., characters that have decimal values between
      ;; 33 and 126, except colon)", i. e., any chars except ctl chars,
      ;; space, or colon.
      '(looking-at "[ \t]\\|[][!\"#$%&'()*+,-./0-9;<=>?@A-Z\\\\^_`a-z{|}~]+:"))
  "*Set this non-nil if the system's mailer runs the header and body together.
\(This problem exists on Sunos 4 when sendmail is run in remote mode.)
The value should be an expression to test whether the problem will
actually occur."
  :group 'message-sending
  :link '(custom-manual "(message)Mail Variables")
  :type 'sexp)

;;;###autoload
(define-mail-user-agent 'message-user-agent
  'message-mail 'message-send-and-exit
  'message-kill-buffer 'message-send-hook)

(defvar message-mh-deletable-headers '(Message-ID Date Lines Sender)
  "If non-nil, delete the deletable headers before feeding to mh.")

(defvar message-send-method-alist
  '((news message-news-p message-send-via-news)
    (mail message-mail-p message-send-via-mail))
  "Alist of ways to send outgoing messages.
Each element has the form

  \(TYPE PREDICATE FUNCTION)

where TYPE is a symbol that names the method; PREDICATE is a function
called without any parameters to determine whether the message is
a message of type TYPE; and FUNCTION is a function to be called if
PREDICATE returns non-nil.  FUNCTION is called with one parameter --
the prefix.")

(defcustom message-mail-alias-type 'abbrev
  "*What alias expansion type to use in Message buffers.
The default is `abbrev', which uses mailabbrev.  `ecomplete' uses
an electric completion mode.  nil switches mail aliases off.
This can also be a list of values."
  :group 'message
  :link '(custom-manual "(message)Mail Aliases")
  :type '(choice (const :tag "Use Mailabbrev" abbrev)
                 (const :tag "Use ecomplete" ecomplete)
                 (const :tag "No expansion" nil)))

(defcustom message-self-insert-commands '(self-insert-command)
  "List of `self-insert-command's used to trigger ecomplete.
When one of those commands is invoked to enter a character in To or Cc
header, ecomplete will suggest the candidates of recipients (see also
`message-mail-alias-type').  If you use some tool to enter non-ASCII
text and it replaces `self-insert-command' with the other command, e.g.
`egg-self-insert-command', you may want to add it to this list."
  :group 'message-various
  :type '(repeat function))

(defcustom message-auto-save-directory
  (file-name-as-directory (expand-file-name "drafts" message-directory))
  "*Directory where Message auto-saves buffers if Gnus isn't running.
If nil, Message won't auto-save."
  :group 'message-buffers
  :link '(custom-manual "(message)Various Message Variables")
  :type '(choice directory (const :tag "Don't auto-save" nil)))

(defcustom message-default-charset
  (and (not (mm-multibyte-p)) 'iso-8859-1)
  "Default charset used in non-MULE Emacsen.
If nil, you might be asked to input the charset."
  :version "21.1"
  :group 'message
  :link '(custom-manual "(message)Various Message Variables")
  :type 'symbol)

(defcustom message-dont-reply-to-names
  (and (boundp 'rmail-dont-reply-to-names) rmail-dont-reply-to-names)
  "*Addresses to prune when doing wide replies.
This can be a regexp or a list of regexps.  Also, a value of nil means
exclude your own user name only."
  :version "21.1"
  :group 'message
  :link '(custom-manual "(message)Wide Reply")
  :type '(choice (const :tag "Yourself" nil)
                 regexp
                 (repeat :tag "Regexp List" regexp)))

(defsubst message-dont-reply-to-names ()
  (gmm-regexp-concat message-dont-reply-to-names))

(defvar message-shoot-gnksa-feet nil
  "*A list of GNKSA feet you are allowed to shoot.
Gnus gives you all the opportunity you could possibly want for
shooting yourself in the foot.  Also, Gnus allows you to shoot the
feet of Good Net-Keeping Seal of Approval.  The following are foot
candidates:
`empty-article'     Allow you to post an empty article;
`quoted-text-only'  Allow you to post quoted text only;
`multiple-copies'   Allow you to post multiple copies;
`cancel-messages'   Allow you to cancel or supersede messages from
                    your other email addresses.")

(defsubst message-gnksa-enable-p (feature)
  (or (not (listp message-shoot-gnksa-feet))
      (memq feature message-shoot-gnksa-feet)))

(defcustom message-hidden-headers '("^References:" "^Face:" "^X-Face:"
                                    "^X-Draft-From:")
  "Regexp of headers to be hidden when composing new messages.
This can also be a list of regexps to match headers.  Or a list
starting with `not' and followed by regexps."
  :version "22.1"
  :group 'message
  :link '(custom-manual "(message)Message Headers")
  :type '(choice
          :format "%{%t%}: %[Value Type%] %v"
          (regexp :menu-tag "regexp" :format "regexp\n%t: %v")
          (repeat :menu-tag "(regexp ...)" :format "(regexp ...)\n%v%i"
                  (regexp :format "%t: %v"))
          (cons :menu-tag "(not regexp ...)" :format "(not regexp ...)\n%v"
                (const not)
                (repeat :format "%v%i"
                        (regexp :format "%t: %v")))))

(defcustom message-cite-articles-with-x-no-archive t
  "If non-nil, cite text from articles that has X-No-Archive set."
  :group 'message
  :type 'boolean)

;;; Internal variables.
;;; Well, not really internal.

(defvar message-mode-syntax-table
  (let ((table (copy-syntax-table text-mode-syntax-table)))
    (modify-syntax-entry ?% ". " table)
    (modify-syntax-entry ?> ". " table)
    (modify-syntax-entry ?< ". " table)
    table)
  "Syntax table used while in Message mode.")

(defface message-header-to
  '((((class color)
      (background dark))
     (:foreground "DarkOliveGreen1" :bold t))
    (((class color)
      (background light))
     (:foreground "MidnightBlue" :bold t))
    (t
     (:bold t :italic t)))
  "Face used for displaying From headers."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-to-face 'face-alias 'message-header-to)
(put 'message-header-to-face 'obsolete-face "22.1")

(defface message-header-cc
  '((((class color)
      (background dark))
     (:foreground "chartreuse1" :bold t))
    (((class color)
      (background light))
     (:foreground "MidnightBlue"))
    (t
     (:bold t)))
  "Face used for displaying Cc headers."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-cc-face 'face-alias 'message-header-cc)
(put 'message-header-cc-face 'obsolete-face "22.1")

(defface message-header-subject
  '((((class color)
      (background dark))
     (:foreground "OliveDrab1"))
    (((class color)
      (background light))
     (:foreground "navy blue" :bold t))
    (t
     (:bold t)))
  "Face used for displaying subject headers."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-subject-face 'face-alias 'message-header-subject)
(put 'message-header-subject-face 'obsolete-face "22.1")

(defface message-header-newsgroups
  '((((class color)
      (background dark))
     (:foreground "yellow" :bold t :italic t))
    (((class color)
      (background light))
     (:foreground "blue4" :bold t :italic t))
    (t
     (:bold t :italic t)))
  "Face used for displaying newsgroups headers."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-newsgroups-face 'face-alias 'message-header-newsgroups)
(put 'message-header-newsgroups-face 'obsolete-face "22.1")

(defface message-header-other
  '((((class color)
      (background dark))
     (:foreground "VioletRed1"))
    (((class color)
      (background light))
     (:foreground "steel blue"))
    (t
     (:bold t :italic t)))
  "Face used for displaying newsgroups headers."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-other-face 'face-alias 'message-header-other)
(put 'message-header-other-face 'obsolete-face "22.1")

(defface message-header-name
  '((((class color)
      (background dark))
     (:foreground "green"))
    (((class color)
      (background light))
     (:foreground "cornflower blue"))
    (t
     (:bold t)))
  "Face used for displaying header names."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-name-face 'face-alias 'message-header-name)
(put 'message-header-name-face 'obsolete-face "22.1")

(defface message-header-xheader
  '((((class color)
      (background dark))
     (:foreground "DeepSkyBlue1"))
    (((class color)
      (background light))
     (:foreground "blue"))
    (t
     (:bold t)))
  "Face used for displaying X-Header headers."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-header-xheader-face 'face-alias 'message-header-xheader)
(put 'message-header-xheader-face 'obsolete-face "22.1")

(defface message-separator
  '((((class color)
      (background dark))
     (:foreground "LightSkyBlue1"))
    (((class color)
      (background light))
     (:foreground "brown"))
    (t
     (:bold t)))
  "Face used for displaying the separator."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-separator-face 'face-alias 'message-separator)
(put 'message-separator-face 'obsolete-face "22.1")

(defface message-cited-text
  '((((class color)
      (background dark))
     (:foreground "LightPink1"))
    (((class color)
      (background light))
     (:foreground "red"))
    (t
     (:bold t)))
  "Face used for displaying cited text names."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-cited-text-face 'face-alias 'message-cited-text)
(put 'message-cited-text-face 'obsolete-face "22.1")

(defface message-mml
  '((((class color)
      (background dark))
     (:foreground "MediumSpringGreen"))
    (((class color)
      (background light))
     (:foreground "ForestGreen"))
    (t
     (:bold t)))
  "Face used for displaying MML."
  :group 'message-faces)
;; backward-compatibility alias
(put 'message-mml-face 'face-alias 'message-mml)
(put 'message-mml-face 'obsolete-face "22.1")

(defun message-font-lock-make-header-matcher (regexp)
  (let ((form
         `(lambda (limit)
            (let ((start (point)))
              (save-restriction
                (widen)
                (goto-char (point-min))
                (if (re-search-forward
                     (concat "^" (regexp-quote mail-header-separator) "$")
                     nil t)
                    (setq limit (min limit (match-beginning 0))))
                (goto-char start))
              (and (< start limit)
                   (re-search-forward ,regexp limit t))))))
    (if (featurep 'bytecomp)
        (byte-compile form)
      form)))

(defvar message-font-lock-keywords
  (let ((content "[ \t]*\\(.+\\(\n[ \t].*\\)*\\)\n?"))
    `((,(message-font-lock-make-header-matcher
         (concat "^\\([Tt]o:\\)" content))
       (1 'message-header-name)
       (2 'message-header-to nil t))
      (,(message-font-lock-make-header-matcher
         (concat "^\\(^[GBF]?[Cc][Cc]:\\|^[Rr]eply-[Tt]o:\\)" content))
       (1 'message-header-name)
       (2 'message-header-cc nil t))
      (,(message-font-lock-make-header-matcher
         (concat "^\\([Ss]ubject:\\)" content))
       (1 'message-header-name)
       (2 'message-header-subject nil t))
      (,(message-font-lock-make-header-matcher
         (concat "^\\([Nn]ewsgroups:\\|Followup-[Tt]o:\\)" content))
       (1 'message-header-name)
       (2 'message-header-newsgroups nil t))
      (,(message-font-lock-make-header-matcher
         (concat "^\\(X-[A-Za-z0-9-]+:\\|In-Reply-To:\\)" content))
       (1 'message-header-name)
       (2 'message-header-xheader))
      (,(message-font-lock-make-header-matcher
         (concat "^\\([A-Z][^: \n\t]+:\\)" content))
       (1 'message-header-name)
       (2 'message-header-other nil t))
      ,@(if (and mail-header-separator
                 (not (equal mail-header-separator "")))
            `((,(concat "^\\(" (regexp-quote mail-header-separator) "\\)$")
               1 'message-separator))
          nil)
      ((lambda (limit)
         (re-search-forward (concat "^\\("
                                    message-cite-prefix-regexp
                                    "\\).*")
                            limit t))
       (0 'message-cited-text))
      ("<#/?\\(multipart\\|part\\|external\\|mml\\|secure\\)[^>]*>"
       (0 'message-mml))))
  "Additional expressions to highlight in Message mode.")


;; XEmacs does it like this.  For Emacs, we have to set the
;; `font-lock-defaults' buffer-local variable.
(put 'message-mode 'font-lock-defaults '(message-font-lock-keywords t))

(defvar message-face-alist
  '((bold . message-bold-region)
    (underline . underline-region)
    (default . (lambda (b e)
                 (message-unbold-region b e)
                 (ununderline-region b e))))
  "Alist of mail and news faces for facemenu.
The cdr of each entry is a function for applying the face to a region.")

(defcustom message-send-hook nil
  "Hook run before sending messages.
This hook is run quite early when sending."
  :group 'message-various
  :options '(ispell-message)
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-send-mail-hook nil
  "Hook run before sending mail messages.
This hook is run very late -- just before the message is sent as
mail."
  :group 'message-various
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-send-news-hook nil
  "Hook run before sending news messages.
This hook is run very late -- just before the message is sent as
news."
  :group 'message-various
  :link '(custom-manual "(message)Various Message Variables")
  :type 'hook)

(defcustom message-sent-hook nil
  "Hook run after sending messages."
  :group 'message-various
  :type 'hook)

(defvar message-send-coding-system 'binary
  "Coding system to encode outgoing mail.")

(defvar message-draft-coding-system
  mm-auto-save-coding-system
  "*Coding system to compose mail.
If you'd like to make it possible to share draft files between XEmacs
and Emacs, you may use `iso-2022-7bit' for this value at your own risk.
Note that the coding-system `iso-2022-7bit' isn't suitable to all data.")

(defcustom message-send-mail-partially-limit nil
  "The limitation of messages sent as message/partial.
The lower bound of message size in characters, beyond which the message
should be sent in several parts.  If it is nil, the size is unlimited."
  :version "24.1"
  :group 'message-buffers
  :link '(custom-manual "(message)Mail Variables")
  :type '(choice (const :tag "unlimited" nil)
                 (integer 1000000)))

(defcustom message-alternative-emails nil
  "*Regexp matching alternative email addresses.
The first address in the To, Cc or From headers of the original
article matching this variable is used as the From field of
outgoing messages.

This variable has precedence over posting styles and anything that runs
off `message-setup-hook'."
  :group 'message-headers
  :link '(custom-manual "(message)Message Headers")
  :type '(choice (const :tag "Always use primary" nil)
                 regexp))

(defcustom message-hierarchical-addresses nil
  "A list of hierarchical mail address definitions.

Inside each entry, the first address is the \"top\" address, and
subsequent addresses are subaddresses; this is used to indicate that
mail sent to the first address will automatically be delivered to the
subaddresses.  So if the first address appears in the recipient list
for a message, the subaddresses will be removed (if present) before
the mail is sent.  All addresses in this structure should be
downcased."
  :version "22.1"
  :group 'message-headers
  :type '(repeat (repeat string)))

(defcustom message-mail-user-agent nil
  "Like `mail-user-agent'.
Except if it is nil, use Gnus native MUA; if it is t, use
`mail-user-agent'."
  :version "22.1"
  :type '(radio (const :tag "Gnus native"
                       :format "%t\n"
                       nil)
                (const :tag "`mail-user-agent'"
                       :format "%t\n"
                       t)
                (function-item :tag "Default Emacs mail"
                               :format "%t\n"
                               sendmail-user-agent)
                (function-item :tag "Emacs interface to MH"
                               :format "%t\n"
                               mh-e-user-agent)
                (function :tag "Other"))
  :version "21.1"
  :group 'message)

(defcustom message-wide-reply-confirm-recipients nil
  "Whether to confirm a wide reply to multiple email recipients.
If this variable is nil, don't ask whether to reply to all recipients.
If this variable is non-nil, pose the question \"Reply to all
recipients?\" before a wide reply to multiple recipients.  If the user
answers yes, reply to all recipients as usual.  If the user answers
no, only reply back to the author."
  :version "22.1"
  :group 'message-headers
  :link '(custom-manual "(message)Wide Reply")
  :type 'boolean)

(defcustom message-user-fqdn nil
  "*Domain part of Message-Ids."
  :version "22.1"
  :group 'message-headers
  :link '(custom-manual "(message)News Headers")
  :type '(radio (const :format "%v  " nil)
                (string :format "FQDN: %v")))

(defcustom message-use-idna (and (condition-case nil (require 'idna)
                                   (file-error))
                                 (mm-coding-system-p 'utf-8)
                                 (executable-find idna-program)
                                 (string= (idna-to-ascii "räksmörgås")
                                          "xn--rksmrgs-5wao1o")
                                 t)
  "Whether to encode non-ASCII in domain names into ASCII according to IDNA.
GNU Libidn, and in particular the elisp package \"idna.el\" and
the external program \"idn\", must be installed for this
functionality to work."
  :version "22.1"
  :group 'message-headers
  :link '(custom-manual "(message)IDNA")
  :type '(choice (const :tag "Ask" ask)
                 (const :tag "Never" nil)
                 (const :tag "Always" t)))

(defcustom message-generate-hashcash (if (executable-find "hashcash") 'opportunistic)
  "*Whether to generate X-Hashcash: headers.
If t, always generate hashcash headers.  If `opportunistic',
only generate hashcash headers if it can be done without the user
waiting (i.e., only asynchronously).

You must have the \"hashcash\" binary installed, see `hashcash-path'."
  :version "24.1"
  :group 'message-headers
  :link '(custom-manual "(message)Mail Headers")
  :type '(choice (const :tag "Always" t)
                 (const :tag "Never" nil)
                 (const :tag "Opportunistic" opportunistic)))

;;; Internal variables.

(defvar message-sending-message "Sending...")
(defvar message-buffer-list nil)
(defvar message-this-is-news nil)
(defvar message-this-is-mail nil)
(defvar message-draft-article nil)
(defvar message-mime-part nil)
(defvar message-posting-charset nil)
(defvar message-inserted-headers nil)
(defvar message-inhibit-ecomplete nil)

;; Byte-compiler warning
(defvar gnus-active-hashtb)
(defvar gnus-read-active-file)

;;; Regexp matching the delimiter of messages in UNIX mail format
;;; (UNIX From lines), minus the initial ^.  It should be a copy
;;; of rmail.el's rmail-unix-mail-delimiter.
(defvar message-unix-mail-delimiter
  (let ((time-zone-regexp
         (concat "\\([A-Z]?[A-Z]?[A-Z][A-Z]\\( DST\\)?"
                 "\\|[-+]?[0-9][0-9][0-9][0-9]"
                 "\\|"
                 "\\) *")))
    (concat
     "From "

     ;; Many things can happen to an RFC 822 mailbox before it is put into
     ;; a `From' line.  The leading phrase can be stripped, e.g.
     ;; `Joe <@w.x:joe@y.z>' -> `<@w.x:joe@y.z>'.  The <> can be stripped, e.g.
     ;; `<@x.y:joe@y.z>' -> `@x.y:joe@y.z'.  Everything starting with a CRLF
     ;; can be removed, e.g.
     ;;         From: joe@y.z (Joe      K
     ;;                 User)
     ;; can yield `From joe@y.z (Joe    K Fri Mar 22 08:11:15 1996', and
     ;;         From: Joe User
     ;;                 <joe@y.z>
     ;; can yield `From Joe User Fri Mar 22 08:11:15 1996'.
     ;; The mailbox can be removed or be replaced by white space, e.g.
     ;;         From: "Joe User"{space}{tab}
     ;;                 <joe@y.z>
     ;; can yield `From {space}{tab} Fri Mar 22 08:11:15 1996',
     ;; where {space} and {tab} represent the Ascii space and tab characters.
     ;; We want to match the results of any of these manglings.
     ;; The following regexp rejects names whose first characters are
     ;; obviously bogus, but after that anything goes.
     "\\([^\0-\b\n-\r\^?].*\\)?"

     ;; The time the message was sent.
     "\\([^\0-\r \^?]+\\) +"            ; day of the week
     "\\([^\0-\r \^?]+\\) +"            ; month
     "\\([0-3]?[0-9]\\) +"              ; day of month
     "\\([0-2][0-9]:[0-5][0-9]\\(:[0-6][0-9]\\)?\\) *" ; time of day

     ;; Perhaps a time zone, specified by an abbreviation, or by a
     ;; numeric offset.
     time-zone-regexp

     ;; The year.
     " \\([0-9][0-9]+\\) *"

     ;; On some systems the time zone can appear after the year, too.
     time-zone-regexp

     ;; Old uucp cruft.
     "\\(remote from .*\\)?"

     "\n"))
  "Regexp matching the delimiter of messages in UNIX mail format.")

(defvar message-unsent-separator
  (concat "^ *---+ +Unsent message follows +---+ *$\\|"
          "^ *---+ +Returned message +---+ *$\\|"
          "^Start of returned message$\\|"
          "^ *---+ +Original message +---+ *$\\|"
          "^ *--+ +begin message +--+ *$\\|"
          "^ *---+ +Original message follows +---+ *$\\|"
          "^ *---+ +Undelivered message follows +---+ *$\\|"
          "^------ This is a copy of the message, including all the headers. ------ *$\\|"
          "^|? *---+ +Message text follows: +---+ *|?$")
  "A regexp that matches the separator before the text of a failed message.")

(defvar message-field-fillers
  '((To message-fill-field-address)
    (Cc message-fill-field-address)
    (From message-fill-field-address))
  "Alist of header names/filler functions.")

(defvar message-header-format-alist
  `((From)
    (Newsgroups)
    (To)
    (Cc)
    (Subject)
    (In-Reply-To)
    (Fcc)
    (Bcc)
    (Date)
    (Organization)
    (Distribution)
    (Lines)
    (Expires)
    (Message-ID)
    (References . message-shorten-references)
    (User-Agent))
  "Alist used for formatting headers.")

(defvar message-options nil
  "Some saved answers when sending message.")

(defvar message-send-mail-real-function nil
  "Internal send mail function.")

(defvar message-bogus-system-names "^localhost\\.\\|\\.local$"
  "The regexp of bogus system names.")

(defcustom message-valid-fqdn-regexp
  (concat "[a-z0-9][-.a-z0-9]+\\." ;; [hostname.subdomain.]domain.
          ;; valid TLDs:
          "\\([a-z][a-z]\\|" ;; two letter country TDLs
          "aero\\|arpa\\|bitnet\\|biz\\|bofh\\|"
          "cat\\|com\\|coop\\|edu\\|gov\\|"
          "info\\|int\\|jobs\\|"
          "mil\\|mobi\\|museum\\|name\\|net\\|"
          "org\\|pro\\|travel\\|uucp\\)")
  ;; http://en.wikipedia.org/wiki/List_of_Internet_top-level_domains
  ;; http://en.wikipedia.org/wiki/GTLD
  ;; `in the process of being approved': .asia .post .tel .sex
  ;; "dead" nato bitnet uucp
  "Regular expression that matches a valid FQDN."
  ;; see also: gnus-button-valid-fqdn-regexp
  :version "22.1"
  :group 'message-headers
  :type 'regexp)

(autoload 'gnus-alive-p "gnus-util")
(autoload 'gnus-delay-article "gnus-delay")
(autoload 'gnus-extract-address-components "gnus-util")
(autoload 'gnus-find-method-for-group "gnus")
(autoload 'gnus-group-decoded-name "gnus-group")
(autoload 'gnus-group-name-charset "gnus-group")
(autoload 'gnus-group-name-decode "gnus-group")
(autoload 'gnus-groups-from-server "gnus")
(autoload 'gnus-make-local-hook "gnus-util")
(autoload 'gnus-open-server "gnus-int")
(autoload 'gnus-output-to-mail "gnus-util")
(autoload 'gnus-output-to-rmail "gnus-util")
(autoload 'gnus-request-post "gnus-int")
(autoload 'gnus-select-frame-set-input-focus "gnus-util")
(autoload 'gnus-server-string "gnus")
(autoload 'idna-to-ascii "idna")
(autoload 'message-setup-toolbar "messagexmas")
(autoload 'mh-new-draft-name "mh-comp")
(autoload 'mh-send-letter "mh-comp")
(autoload 'nndraft-request-associate-buffer "nndraft")
(autoload 'nndraft-request-expire-articles "nndraft")
(autoload 'nnvirtual-find-group-art "nnvirtual")
(autoload 'rmail-dont-reply-to "mail-utils")
(autoload 'rmail-msg-is-pruned "rmail")
(autoload 'rmail-output "rmailout")

\f

;;;
;;; Utility functions.
;;;

(defmacro message-y-or-n-p (question show &rest text)
  "Ask QUESTION, displaying remaining args in a temporary buffer if SHOW."
  `(message-talkative-question 'y-or-n-p ,question ,show ,@text))

(defmacro message-delete-line (&optional n)
  "Delete the current line (and the next N lines)."
  `(delete-region (progn (beginning-of-line) (point))
                  (progn (forward-line ,(or n 1)) (point))))

(defun message-mark-active-p ()
  "Non-nil means the mark and region are currently active in this buffer."
  mark-active)

(defun message-unquote-tokens (elems)
  "Remove double quotes (\") from strings in list ELEMS."
  (mapcar (lambda (item)
            (while (string-match "^\\(.*\\)\"\\(.*\\)$" item)
              (setq item (concat (match-string 1 item)
                                 (match-string 2 item))))
            item)
          elems))

(defun message-tokenize-header (header &optional separator)
  "Split HEADER into a list of header elements.
SEPARATOR is a string of characters to be used as separators.  \",\"
is used by default."
  (if (not header)
      nil
    (let ((regexp (format "[%s]+" (or separator ",")))
          (first t)
          beg quoted elems paren)
      (with-temp-buffer
        (mm-enable-multibyte)
        (setq beg (point-min))
        (insert header)
        (goto-char (point-min))
        (while (not (eobp))
          (if first
              (setq first nil)
            (forward-char 1))
          (cond ((and (> (point) beg)
                      (or (eobp)
                          (and (looking-at regexp)
                               (not quoted)
                               (not paren))))
                 (push (buffer-substring beg (point)) elems)
                 (setq beg (match-end 0)))
                ((eq (char-after) ?\")
                 (setq quoted (not quoted)))
                ((and (eq (char-after) ?\()
                      (not quoted))
                 (setq paren t))
                ((and (eq (char-after) ?\))
                      (not quoted))
                 (setq paren nil))))
        (nreverse elems)))))

(autoload 'nnheader-insert-file-contents "nnheader")

(defun message-mail-file-mbox-p (file)
  "Say whether FILE looks like a Unix mbox file."
  (when (and (file-exists-p file)
             (file-readable-p file)
             (file-regular-p file))
    (with-temp-buffer
      (nnheader-insert-file-contents file)
      (goto-char (point-min))
      (looking-at message-unix-mail-delimiter))))

(defun message-fetch-field (header &optional not-all)
  "The same as `mail-fetch-field', only remove all newlines.
The buffer is expected to be narrowed to just the header of the message;
see `message-narrow-to-headers-or-head'."
  (let* ((inhibit-point-motion-hooks t)
         (value (mail-fetch-field header nil (not not-all))))
    (when value
      (while (string-match "\n[\t ]+" value)
        (setq value (replace-match " " t t value)))
      value)))

(defun message-field-value (header &optional not-all)
  "The same as `message-fetch-field', only narrow to the headers first."
  (save-excursion
    (save-restriction
      (message-narrow-to-headers-or-head)
      (message-fetch-field header not-all))))

(defun message-narrow-to-field ()
  "Narrow the buffer to the header on the current line."
  (beginning-of-line)
  (while (looking-at "[ \t]")
    (forward-line -1))
  (narrow-to-region
   (point)
   (progn
     (forward-line 1)
     (if (re-search-forward "^[^ \n\t]" nil t)
         (point-at-bol)
       (point-max))))
  (goto-char (point-min)))

(defun message-add-header (&rest headers)
  "Add the HEADERS to the message header, skipping those already present."
  (while headers
    (let (hclean)
      (unless (string-match "^\\([^:]+\\):[ \t]*[^ \t]" (car headers))
        (error "Invalid header `%s'" (car headers)))
      (setq hclean (match-string 1 (car headers)))
      (save-restriction
        (message-narrow-to-headers)
        (unless (re-search-forward (concat "^" (regexp-quote hclean) ":") nil t)
          (goto-char (point-max))
          (if (string-match "\n$" (car headers))
              (insert (car headers))
            (insert (car headers) ?\n)))))
    (setq headers (cdr headers))))

(defmacro message-with-reply-buffer (&rest forms)
  "Evaluate FORMS in the reply buffer, if it exists."
  `(when (and (bufferp message-reply-buffer)
              (buffer-name message-reply-buffer))
     (with-current-buffer message-reply-buffer
       ,@forms)))

(put 'message-with-reply-buffer 'lisp-indent-function 0)
(put 'message-with-reply-buffer 'edebug-form-spec '(body))

(defun message-fetch-reply-field (header)
  "Fetch field HEADER from the message we're replying to."
  (message-with-reply-buffer
    (save-restriction
      (mail-narrow-to-head)
      (message-fetch-field header))))

(defun message-strip-list-identifiers (subject)
  "Remove list identifiers in `gnus-list-identifiers' from string SUBJECT."
  (require 'gnus-sum)                   ; for gnus-list-identifiers
  (let ((regexp (if (stringp gnus-list-identifiers)
                    gnus-list-identifiers
                  (mapconcat 'identity gnus-list-identifiers " *\\|"))))
    (if (string-match (concat "\\(\\(\\(Re: +\\)?\\(" regexp
                              " *\\)\\)+\\(Re: +\\)?\\)") subject)
        (concat (substring subject 0 (match-beginning 1))
                (or (match-string 3 subject)
                    (match-string 5 subject))
                (substring subject
                           (match-end 1)))
      subject)))

(defun message-strip-subject-re (subject)
  "Remove \"Re:\" from subject lines in string SUBJECT."
  (if (string-match message-subject-re-regexp subject)
      (substring subject (match-end 0))
    subject))

(defcustom message-replacement-char "."
  "Replacement character used instead of unprintable or not decodable chars."
  :group 'message-various
  :version "22.1" ;; Gnus 5.10.9
  :type '(choice string
                 (const ".")
                 (const "?")))

;; FIXME: We also should call `message-strip-subject-encoded-words'
;; when forwarding.  Probably in `message-make-forward-subject' and
;; `message-forward-make-body'.

(defun message-strip-subject-encoded-words (subject)
  "Fix non-decodable words in SUBJECT."
  ;; Cf. `gnus-simplify-subject-fully'.
  (let* ((case-fold-search t)
         (replacement-chars (format "[%s%s%s]"
                                    message-replacement-char
                                    message-replacement-char
                                    message-replacement-char))
         (enc-word-re "=\\?\\([^?]+\\)\\?\\([QB]\\)\\?\\([^?]+\\)\\(\\?=\\)")
         cs-string
         (have-marker
          (with-temp-buffer
            (insert subject)
            (goto-char (point-min))
            (when (re-search-forward enc-word-re nil t)
              (setq cs-string (match-string 1)))))
         cs-coding q-or-b word-beg word-end)
    (if (or (not have-marker) ;; No encoded word found...
            ;; ... or double encoding was correct:
            (and (stringp cs-string)
                 (setq cs-string (downcase cs-string))
                 (mm-coding-system-p (intern cs-string))
                 (not (prog1
                          (y-or-n-p
                           (format "\
Decoded Subject \"%s\"
contains a valid encoded word.  Decode again? "
                                   subject))
                        (setq cs-coding (intern cs-string))))))
        subject
      (with-temp-buffer
        (insert subject)
        (goto-char (point-min))
        (while (re-search-forward enc-word-re nil t)
          (setq cs-string (downcase (match-string 1))
                q-or-b    (match-string 2)
                word-beg (match-beginning 0)
                word-end (match-end 0))
          (setq cs-coding
                (if (mm-coding-system-p (intern cs-string))
                    (setq cs-coding (intern cs-string))
                  nil))
          ;; No double encoded subject? => bogus charset.
          (unless cs-coding
            (setq cs-coding
                  (mm-read-coding-system
                   (format "\
Decoded Subject \"%s\"
contains an encoded word.  The charset `%s' is unknown or invalid.
Hit RET to replace non-decodable characters with \"%s\" or enter replacement
charset: "
                           subject cs-string message-replacement-char)))
            (if cs-coding
                (replace-match (concat "=?" (symbol-name cs-coding)
                                       "?\\2?\\3\\4\\5"))
              (save-excursion
                (goto-char word-beg)
                (re-search-forward "=\\?\\([^?]+\\)\\?\\([QB]\\)\\?" word-end t)
                (replace-match "")
                ;; QP or base64
                (if (string-match "\\`Q\\'" q-or-b)
                    ;; QP
                    (progn
                      (message "Replacing non-decodable characters with \"%s\"."
                               message-replacement-char)
                      (while (re-search-forward "\\(=[A-F0-9][A-F0-9]\\)+"
                                                word-end t)
                        (replace-match message-replacement-char)))
                  ;; base64
                  (message "Replacing non-decodable characters with \"%s\"."
                           replacement-chars)
                  (re-search-forward "[^?]+" word-end t)
                  (replace-match replacement-chars))
                (re-search-forward "\\?=")
                (replace-match "")))))
        (rfc2047-decode-region (point-min) (point-max))
        (buffer-string)))))

;;; Start of functions adopted from `message-utils.el'.

(defun message-strip-subject-trailing-was (subject)
  "Remove trailing \"(was: <old subject>)\" from SUBJECT lines.
Leading \"Re: \" is not stripped by this function.  Use the function
`message-strip-subject-re' for this."
  (let* ((query message-subject-trailing-was-query)
         (new) (found))
    (setq found
          (string-match
           (if (eq query 'ask)
               message-subject-trailing-was-ask-regexp
             message-subject-trailing-was-regexp)
           subject))
    (if found
        (setq new (substring subject 0 (match-beginning 0))))
    (if (or (not found) (eq query nil))
        subject
      (if (eq query 'ask)
          (if (message-y-or-n-p
               "Strip `(was: <old subject>)' in subject? " t
               (concat
                "Strip `(was: <old subject>)' in subject "
                "and use the new one instead?\n\n"
                "Current subject is:   \""
                subject "\"\n\n"
                "New subject would be: \""
                new "\"\n\n"
                "See the variable `message-subject-trailing-was-query' "
                "to get rid of this query."
                ))
              new subject)
        new))))

;;; Suggested by Jonas Steverud  @  www.dtek.chalmers.se/~d4jonas/

(defun message-change-subject (new-subject)
  "Ask for NEW-SUBJECT header, append (was: <Old Subject>)."
  ;; <URL:http://www.landfield.com/usefor/drafts/draft-ietf-usefor-useage--1.02.unpaged>
  (interactive
   (list
    (read-from-minibuffer "New subject: ")))
  (cond ((and (not (or (null new-subject) ; new subject not empty
                       (zerop (string-width new-subject))
                       (string-match "^[ \t]*$" new-subject))))
         (save-excursion
           (let ((old-subject
                  (save-restriction
                    (message-narrow-to-headers)
                    (message-fetch-field "Subject"))))
             (cond ((not old-subject)
                    (error "No current subject"))
                   ((not (string-match
                          (concat "^[ \t]*"
                                  (regexp-quote new-subject)
                                  " \t]*$")
                          old-subject))  ; yes, it really is a new subject
                    ;; delete eventual Re: prefix
                    (setq old-subject
                          (message-strip-subject-re old-subject))
                    (message-goto-subject)
                    (message-delete-line)
                    (insert (concat "Subject: "
                                    new-subject
                                    " (was: "
                                    old-subject ")\n")))))))))

(defun message-mark-inserted-region (beg end &optional verbatim)
  "Mark some region in the current article with enclosing tags.
See `message-mark-insert-begin' and `message-mark-insert-end'.
If VERBATIM, use slrn style verbatim marks (\"#v+\" and \"#v-\")."
  (interactive "r\nP")
  (save-excursion
    ;; add to the end of the region first, otherwise end would be invalid
    (goto-char end)
    (insert (if verbatim "#v-\n" message-mark-insert-end))
    (goto-char beg)
    (insert (if verbatim "#v+\n" message-mark-insert-begin))))

(defun message-mark-insert-file (file &optional verbatim)
  "Insert FILE at point, marking it with enclosing tags.
See `message-mark-insert-begin' and `message-mark-insert-end'.
If VERBATIM, use slrn style verbatim marks (\"#v+\" and \"#v-\")."
  (interactive "fFile to insert: \nP")
    ;; reverse insertion to get correct result.
  (let ((p (point)))
    (insert (if verbatim "#v-\n" message-mark-insert-end))
    (goto-char p)
    (insert-file-contents file)
    (goto-char p)
    (insert (if verbatim "#v+\n" message-mark-insert-begin))))

(defun message-add-archive-header ()
  "Insert \"X-No-Archive: Yes\" in the header and a note in the body.
The note can be customized using `message-archive-note'.  When called with a
prefix argument, ask for a text to insert.  If you don't want the note in the
body, set  `message-archive-note' to nil."
  (interactive)
  (if current-prefix-arg
      (setq message-archive-note
            (read-from-minibuffer "Reason for No-Archive: "
                                  (cons message-archive-note 0))))
    (save-excursion
      (if (message-goto-signature)
          (re-search-backward message-signature-separator))
      (when message-archive-note
        (insert message-archive-note)
        (newline))
      (message-add-header message-archive-header)
      (message-sort-headers)))

(defun message-cross-post-followup-to-header (target-group)
  "Mangles FollowUp-To and Newsgroups header to point to TARGET-GROUP.
With prefix-argument just set Follow-Up, don't cross-post."
  (interactive
   (list ; Completion based on Gnus
    (completing-read "Followup To: "
                     (if (boundp 'gnus-newsrc-alist)
                         gnus-newsrc-alist)
                     nil nil '("poster" . 0)
                     (if (boundp 'gnus-group-history)
                         'gnus-group-history))))
  (message-remove-header "Follow[Uu]p-[Tt]o" t)
  (message-goto-newsgroups)
  (beginning-of-line)
  ;; if we already did a crosspost before, kill old target
  (if (and message-cross-post-old-target
           (re-search-forward
            (regexp-quote (concat "," message-cross-post-old-target))
            nil t))
      (replace-match ""))
  ;; unless (followup is to poster or user explicitly asked not
  ;; to cross-post, or target-group is already in Newsgroups)
  ;; add target-group to Newsgroups line.
  (cond ((and (or
               ;; def: cross-post, req:no
               (and message-cross-post-default (not current-prefix-arg))
               ;; def: no-cross-post, req:yes
               (and (not message-cross-post-default) current-prefix-arg))
              (not (string-match "poster" target-group))
              (not (string-match (regexp-quote target-group)
                                 (message-fetch-field "Newsgroups"))))
         (end-of-line)
         (insert (concat "," target-group))))
  (end-of-line) ; ensure Followup: comes after Newsgroups:
  ;; unless new followup would be identical to Newsgroups line
  ;; make a new Followup-To line
  (if (not (string-match (concat "^[ \t]*"
                                 target-group
                                 "[ \t]*$")
                         (message-fetch-field "Newsgroups")))
      (insert (concat "\nFollowup-To: " target-group)))
  (setq message-cross-post-old-target target-group))

(defun message-cross-post-insert-note (target-group cross-post in-old
                                                    old-groups)
  "Insert a in message body note about a set Followup or Crosspost.
If there have been previous notes, delete them.  TARGET-GROUP specifies the
group to Followup-To.  When CROSS-POST is t, insert note about
crossposting.  IN-OLD specifies whether TARGET-GROUP is a member of
OLD-GROUPS.  OLD-GROUPS lists the old-groups the posting would have
been made to before the user asked for a Crosspost."
  ;; start scanning body for previous uses
  (message-goto-signature)
  (let ((head (re-search-backward
               (concat "^" mail-header-separator)
               nil t))) ; just search in body
    (message-goto-signature)
    (while (re-search-backward
            (concat "^" (regexp-quote message-cross-post-note) ".*")
            head t)
      (message-delete-line))
    (message-goto-signature)
    (while (re-search-backward
            (concat "^" (regexp-quote message-followup-to-note) ".*")
            head t)
      (message-delete-line))
    ;; insert new note
    (if (message-goto-signature)
        (re-search-backward message-signature-separator))
    (if (or in-old
            (not cross-post)
            (string-match "^[ \t]*poster[ \t]*$" target-group))
        (insert (concat message-followup-to-note target-group "\n"))
      (insert (concat message-cross-post-note target-group "\n")))))

(defun message-cross-post-followup-to (target-group)
  "Crossposts message and set Followup-To to TARGET-GROUP.
With prefix-argument just set Follow-Up, don't cross-post."
  (interactive
   (list ; Completion based on Gnus
    (completing-read "Followup To: "
                     (if (boundp 'gnus-newsrc-alist)
                         gnus-newsrc-alist)
                     nil nil '("poster" . 0)
                     (if (boundp 'gnus-group-history)
                         'gnus-group-history))))
  (cond ((not (or (null target-group) ; new subject not empty
                  (zerop (string-width target-group))
                  (string-match "^[ \t]*$" target-group)))
         (save-excursion
           (let* ((old-groups (message-fetch-field "Newsgroups"))
                  (in-old (string-match
                           (regexp-quote target-group)
                           (or old-groups ""))))
             ;; check whether target exactly matches old Newsgroups
             (cond ((not old-groups)
                    (error "No current newsgroup"))
                   ((or (not in-old)
                        (not (string-match
                              (concat "^[ \t]*"
                                      (regexp-quote target-group)
                                      "[ \t]*$")
                              old-groups)))
                    ;; yes, Newsgroups line must change
                    (message-cross-post-followup-to-header target-group)
                    ;; insert note whether we do cross-post or followup-to
                    (funcall message-cross-post-note-function
                             target-group
                             (if (or (and message-cross-post-default
                                          (not current-prefix-arg))
                                     (and (not message-cross-post-default)
                                          current-prefix-arg)) t)
                             in-old old-groups))))))))

;;; Reduce To: to Cc: or Bcc: header

(defun message-reduce-to-to-cc ()
 "Replace contents of To: header with contents of Cc: or Bcc: header."
 (interactive)
 (let ((cc-content
        (save-restriction (message-narrow-to-headers)
                          (message-fetch-field "cc")))
       (bcc nil))
   (if (and (not cc-content)
            (setq cc-content
                  (save-restriction
                    (message-narrow-to-headers)
                    (message-fetch-field "bcc"))))
       (setq bcc t))
   (cond (cc-content
          (save-excursion
            (message-goto-to)
            (message-delete-line)
            (insert (concat "To: " cc-content "\n"))
            (save-restriction
              (message-narrow-to-headers)
              (message-remove-header (if bcc
                                         "bcc"
                                       "cc"))))))))

;;; End of functions adopted from `message-utils.el'.

(defun message-remove-header (header &optional is-regexp first reverse)
  "Remove HEADER in the narrowed buffer.
If IS-REGEXP, HEADER is a regular expression.
If FIRST, only remove the first instance of the header.
Return the number of headers removed."
  (goto-char (point-min))
  (let ((regexp (if is-regexp header (concat "^" (regexp-quote header) ":")))
        (number 0)
        (case-fold-search t)
        last)
    (while (and (not (eobp))
                (not last))
      (if (if reverse
              (not (looking-at regexp))
            (looking-at regexp))
          (progn
            (incf number)
            (when first
              (setq last t))
            (delete-region
             (point)
             ;; There might be a continuation header, so we have to search
             ;; until we find a new non-continuation line.
             (progn
               (forward-line 1)
               (if (re-search-forward "^[^ \t]" nil t)
                   (goto-char (match-beginning 0))
                 (point-max)))))
        (forward-line 1)
        (if (re-search-forward "^[^ \t]" nil t)
            (goto-char (match-beginning 0))
          (goto-char (point-max)))))
    number))

(defun message-remove-first-header (header)
  "Remove the first instance of HEADER if there is more than one."
  (let ((count 0)
        (regexp (concat "^" (regexp-quote header) ":")))
    (save-excursion
      (goto-char (point-min))
      (while (re-search-forward regexp nil t)
        (incf count)))
    (while (> count 1)
      (message-remove-header header nil t)
      (decf count))))

(defun message-narrow-to-headers ()
  "Narrow the buffer to the head of the message."
  (widen)
  (narrow-to-region
   (goto-char (point-min))
   (if (re-search-forward
        (concat "^" (regexp-quote mail-header-separator) "\n") nil t)
       (match-beginning 0)
     (point-max)))
  (goto-char (point-min)))

(defun message-narrow-to-head-1 ()
  "Like `message-narrow-to-head'.  Don't widen."
  (narrow-to-region
   (goto-char (point-min))
   (if (search-forward "\n\n" nil 1)
       (1- (point))
     (point-max)))
  (goto-char (point-min)))

;; FIXME: clarify diffference: message-narrow-to-head,
;; message-narrow-to-headers-or-head, message-narrow-to-headers
(defun message-narrow-to-head ()
  "Narrow the buffer to the head of the message.
Point is left at the beginning of the narrowed-to region."
  (widen)
  (message-narrow-to-head-1))

(defun message-narrow-to-headers-or-head ()
  "Narrow the buffer to the head of the message."
  (widen)
  (narrow-to-region
   (goto-char (point-min))
   (if (re-search-forward (concat "\\(\n\\)\n\\|^\\("
                                  (regexp-quote mail-header-separator)
                                  "\n\\)")
                          nil t)
       (or (match-end 1) (match-beginning 2))
     (point-max)))
  (goto-char (point-min)))

(defun message-news-p ()
  "Say whether the current buffer contains a news message."
  (and (not message-this-is-mail)
       (or message-this-is-news
           (save-excursion
             (save-restriction
               (message-narrow-to-headers)
               (and (message-fetch-field "newsgroups")
                    (not (message-fetch-field "posted-to"))))))))

(defun message-mail-p ()
  "Say whether the current buffer contains a mail message."
  (and (not message-this-is-news)
       (or message-this-is-mail
           (save-excursion
             (save-restriction
               (message-narrow-to-headers)
               (or (message-fetch-field "to")
                   (message-fetch-field "cc")
                   (message-fetch-field "bcc")))))))

(defun message-subscribed-p ()
  "Say whether we need to insert a MFT header."
  (or message-subscribed-regexps
      message-subscribed-addresses
      message-subscribed-address-file
      message-subscribed-address-functions))

(defun message-next-header ()
  "Go to the beginning of the next header."
  (beginning-of-line)
  (or (eobp) (forward-char 1))
  (not (if (re-search-forward "^[^ \t]" nil t)
           (beginning-of-line)
         (goto-char (point-max)))))

(defun message-sort-headers-1 ()
  "Sort the buffer as headers using `message-rank' text props."
  (goto-char (point-min))
  (require 'sort)
  (sort-subr
   nil 'message-next-header
   (lambda ()
     (message-next-header)
     (unless (bobp)
       (forward-char -1)))
   (lambda ()
     (or (get-text-property (point) 'message-rank)
         10000))))

(defun message-sort-headers ()
  "Sort the headers of the current message according to `message-header-format-alist'."
  (interactive)
  (save-excursion
    (save-restriction
      (let ((max (1+ (length message-header-format-alist)))
            rank)
        (message-narrow-to-headers)
        (while (re-search-forward "^[^ \n]+:" nil t)
          (put-text-property
           (match-beginning 0) (1+ (match-beginning 0))
           'message-rank
           (if (setq rank (length (memq (assq (intern (buffer-substring
                                                       (match-beginning 0)
                                                       (1- (match-end 0))))
                                              message-header-format-alist)
                                        message-header-format-alist)))
               (- max rank)
             (1+ max)))))
      (message-sort-headers-1))))

(defun message-kill-address ()
  "Kill the address under point."
  (interactive)
  (let ((start (point)))
    (message-skip-to-next-address)
    (kill-region start (point))))


(autoload 'Info-goto-node "info")
(defvar mml2015-use)

(defun message-info (&optional arg)
  "Display the Message manual.

Prefixed with one \\[universal-argument], display the Emacs MIME
manual.  With two \\[universal-argument]'s, display the EasyPG or
PGG manual, depending on the value of `mml2015-use'."
  (interactive "p")
  ;; Don't use `info' because support for `(filename)nodename' is not
  ;; available in XEmacs < 21.5.12.
  (Info-goto-node (format "(%s)Top"
                          (cond ((eq arg 16)
                                 (require 'mml2015)
                                 mml2015-use)
                                ((eq arg  4) 'emacs-mime)
                                ;; `booleanp' only available in Emacs 22+
                                ((and (not (memq arg '(nil t)))
                                      (symbolp arg))
                                 arg)
                                (t
                                 'message)))))

\f

;;;
;;; Message mode
;;;

;;; Set up keymap.

(defvar message-mode-map nil)

(unless message-mode-map
  (setq message-mode-map (make-keymap))
  (set-keymap-parent message-mode-map text-mode-map)
  (define-key message-mode-map "\C-c?" 'describe-mode)

  (define-key message-mode-map "\C-c\C-f\C-t" 'message-goto-to)
  (define-key message-mode-map "\C-c\C-f\C-o" 'message-goto-from)
  (define-key message-mode-map "\C-c\C-f\C-b" 'message-goto-bcc)
  (define-key message-mode-map "\C-c\C-f\C-w" 'message-goto-fcc)
  (define-key message-mode-map "\C-c\C-f\C-c" 'message-goto-cc)
  (define-key message-mode-map "\C-c\C-f\C-s" 'message-goto-subject)
  (define-key message-mode-map "\C-c\C-f\C-r" 'message-goto-reply-to)
  (define-key message-mode-map "\C-c\C-f\C-n" 'message-goto-newsgroups)
  (define-key message-mode-map "\C-c\C-f\C-d" 'message-goto-distribution)
  (define-key message-mode-map "\C-c\C-f\C-f" 'message-goto-followup-to)
  (define-key message-mode-map "\C-c\C-f\C-m" 'message-goto-mail-followup-to)
  (define-key message-mode-map "\C-c\C-f\C-k" 'message-goto-keywords)
  (define-key message-mode-map "\C-c\C-f\C-u" 'message-goto-summary)
  (define-key message-mode-map "\C-c\C-f\C-i"
    'message-insert-or-toggle-importance)
  (define-key message-mode-map "\C-c\C-f\C-a"
    'message-generate-unsubscribed-mail-followup-to)

  ;; modify headers (and insert notes in body)
  (define-key message-mode-map "\C-c\C-fs"    'message-change-subject)
  ;;
  (define-key message-mode-map "\C-c\C-fx"    'message-cross-post-followup-to)
  ;; prefix+message-cross-post-followup-to = same w/o cross-post
  (define-key message-mode-map "\C-c\C-ft"    'message-reduce-to-to-cc)
  (define-key message-mode-map "\C-c\C-fa"    'message-add-archive-header)
  ;; mark inserted text
  (define-key message-mode-map "\C-c\M-m" 'message-mark-inserted-region)
  (define-key message-mode-map "\C-c\M-f" 'message-mark-insert-file)

  (define-key message-mode-map "\C-c\C-b" 'message-goto-body)
  (define-key message-mode-map "\C-c\C-i" 'message-goto-signature)

  (define-key message-mode-map "\C-c\C-t" 'message-insert-to)
  (define-key message-mode-map "\C-c\C-fw" 'message-insert-wide-reply)
  (define-key message-mode-map "\C-c\C-n" 'message-insert-newsgroups)
  (define-key message-mode-map "\C-c\C-l" 'message-to-list-only)
  (define-key message-mode-map "\C-c\C-f\C-e" 'message-insert-expires)

  (define-key message-mode-map "\C-c\C-u" 'message-insert-or-toggle-importance)
  (define-key message-mode-map "\C-c\M-n"
    'message-insert-disposition-notification-to)

  (define-key message-mode-map "\C-c\C-y" 'message-yank-original)
  (define-key message-mode-map "\C-c\M-\C-y" 'message-yank-buffer)
  (define-key message-mode-map "\C-c\C-q" 'message-fill-yanked-message)
  (define-key message-mode-map "\C-c\C-w" 'message-insert-signature)
  (define-key message-mode-map "\C-c\M-h" 'message-insert-headers)
  (define-key message-mode-map "\C-c\C-r" 'message-caesar-buffer-body)
  (define-key message-mode-map "\C-c\C-o" 'message-sort-headers)
  (define-key message-mode-map "\C-c\M-r" 'message-rename-buffer)

  (define-key message-mode-map "\C-c\C-c" 'message-send-and-exit)
  (define-key message-mode-map "\C-c\C-s" 'message-send)
  (define-key message-mode-map "\C-c\C-k" 'message-kill-buffer)
  (define-key message-mode-map "\C-c\C-d" 'message-dont-send)
  (define-key message-mode-map "\C-c\n" 'gnus-delay-article)

  (define-key message-mode-map "\C-c\M-k" 'message-kill-address)
  (define-key message-mode-map "\C-c\C-e" 'message-elide-region)
  (define-key message-mode-map "\C-c\C-v" 'message-delete-not-region)
  (define-key message-mode-map "\C-c\C-z" 'message-kill-to-signature)
  (define-key message-mode-map "\M-\r" 'message-newline-and-reformat)
  (define-key message-mode-map [remap split-line]  'message-split-line)

  (define-key message-mode-map "\C-c\C-a" 'mml-attach-file)

  (define-key message-mode-map "\C-a" 'message-beginning-of-line)
  (define-key message-mode-map "\t" 'message-tab)
  (define-key message-mode-map "\M-;" 'comment-region)

  (define-key message-mode-map "\M-n" 'message-display-abbrev))

(easy-menu-define
  message-mode-menu message-mode-map "Message Menu."