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[gnus] / lisp / gnus-msg.el

;;; gnus-msg.el --- mail and post interface for Gnus
;; Copyright (C) 1995,96 Free Software Foundation, Inc.

;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
;;      Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; Keywords: 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 2, 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; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;; Code:

(require 'gnus)
(require 'sendmail)
(require 'gnus-ems)
(eval-when-compile (require 'cl))

;; Added by Sudish Joseph <joseph@cis.ohio-state.edu>.
(defvar gnus-post-method nil
  "*Preferred method for posting USENET news.
If this variable is nil, Gnus will use the current method to decide
which method to use when posting.  If it is non-nil, it will override
the current method.  This method will not be used in mail groups and
the like, only in \"real\" newsgroups.

The value must be a valid method as discussed in the documentation of
`gnus-select-method'.  It can also be a list of methods.  If that is
the case, the user will be queried for what select method to use when
posting.")

(defvar gnus-organization-file "/usr/lib/news/organization"
  "*Local news organization file.")

(defvar gnus-prepare-article-hook nil
  "*A hook called after preparing body, but before preparing header headers.")

(defvar gnus-post-prepare-function nil
  "*Function that is run after a post buffer has been prepared.
It is called with the name of the newsgroup that is posted to. It
might be used, for instance, for inserting signatures based on the
newsgroup name. (In that case, `gnus-signature-file' and
`mail-signature' should both be set to nil).")

(defvar gnus-post-prepare-hook nil
  "*Hook that is run after a post buffer has been prepared.
If you want to insert the signature, you might put
`gnus-inews-insert-signature' in this hook.")

(defvar gnus-use-followup-to 'ask
  "*Specifies what to do with Followup-To header.
If nil, ignore the header. If it is t, use its value, but ignore
\"poster\".  If it is the symbol `ask', query the user whether to
ignore the \"poster\" value.  If it is the symbol `use', always use
the value.")

(defvar gnus-followup-to-function nil
  "*A variable that contains a function that returns a followup address.
The function will be called in the buffer of the article that is being
followed up. The buffer will be narrowed to the headers of the
article. To pick header headers, one might use `mail-fetch-field'.  The
function will be called with the name of the current newsgroup as the
argument.

Here's an example `gnus-followup-to-function':

(setq gnus-followup-to-function
      (lambda (group)
        (cond ((string= group \"mail.list\")
               (or (mail-fetch-field \"sender\") 
                   (mail-fetch-field \"from\")))
              (t
               (or (mail-fetch-field \"reply-to\") 
                   (mail-fetch-field \"from\"))))))")

(defvar gnus-reply-to-function nil
  "*A variable that contains a function that returns a reply address.
See the `gnus-followup-to-function' variable for an explanation of how
this variable is used.

This function should return a string that will be used to fill in the
header.  This function may also return a list.  In that case, every
list element should be a cons where the first car should be a string
with the header name, and the cdr should be a string with the header
value.")

(defvar gnus-author-copy (getenv "AUTHORCOPY")
  "*Save outgoing articles in this file.
Initialized from the AUTHORCOPY environment variable.

If this variable begins with the character \"|\", outgoing articles
will be piped to the named program. It is possible to save an article
in an MH folder as follows:

\(setq gnus-author-copy \"|/usr/local/lib/mh/rcvstore +Article\")

If the first character is not a pipe, articles are saved using the
function specified by the `gnus-author-copy-saver' variable.")

(defvar gnus-mail-self-blind nil
  "*Non-nil means insert a BCC header in all outgoing articles.
This will result in having a copy of the article mailed to yourself.
The BCC header is inserted when the post buffer is initialized, so you
can remove or alter the BCC header to override the default.")

(defvar gnus-author-copy-saver (function rmail-output)
  "*A function called to save outgoing articles.
This function will be called with the same of the file to store the
article in. The default function is `rmail-output' which saves in Unix
mailbox format.")

(defvar gnus-outgoing-message-group nil
  "*All outgoing messages will be put in this group.
If you want to store all your outgoing mail and articles in the group
\"nnml:archive\", you set this variable to that value. This variable
can also be a list of group names. 

If you want to have greater control over what group to put each
message in, you can set this variable to a function that checks the
current newsgroup name and then returns a suitable group name (or list
of names).")

(defvar gnus-message-archive-group
  '((if (eq major-mode 'news-reply-mode) "misc-news" "misc-mail"))
  "*Name of the group in which to save the messages you've written.
This can either be a string, a list of strings; or an alist
of regexps/functions/forms to be evaluated to return a string (or a list
of strings).  The functions are called with the name of the current
group (or nil) as a parameter.")

(defvar gnus-mailing-list-groups nil
  "*Regexp matching groups that are really mailing lists.
This is useful when you're reading a mailing list that has been
gatewayed to a newsgroup, and you want to followup to an article in
the group.")

(defvar gnus-draft-group-directory 
  (expand-file-name
   (concat (file-name-as-directory gnus-article-save-directory)
           "drafts"))
  "*The directory where draft messages will be stored.")

(defvar gnus-use-draft t
  "*Whether Gnus should use the draft group.")

(defvar gnus-posting-styles nil
  "*Alist of styles to use when posting.")

(defvar gnus-posting-style-alist
  '((organization . gnus-organization-file)
    (signature . gnus-signature-file)
    (from . gnus-user-from-line))
  "*Mapping from style parameters to Gnus variables.")

(defvar gnus-user-login-name nil
  "*The login name of the user.
Got from the function `user-login-name' if undefined.")

(defvar gnus-user-full-name nil
  "*The full name of the user.
Got from the NAME environment variable if undefined.")

(defvar gnus-user-from-line nil
  "*Your full, complete e-mail address.  
Overrides the other Gnus variables if it is non-nil.

Here are two example values of this variable:

 \"Lars Magne Ingebrigtsen <larsi@ifi.uio.no>\"

and

 \"larsi@ifi.uio.no (Lars Magne Ingebrigtsen)\"

The first version is recommended, but the name has to be quoted if it
contains non-alphanumerical characters.")

(defvar gnus-signature-file "~/.signature"
  "*Your signature file.
If the variable is a string that doesn't correspond to a file, the
string itself is inserted.")

(defvar gnus-signature-function nil
  "*A function that should return a signature file name.
The function will be called with the name of the newsgroup being
posted to.
If the function returns a string that doesn't correspond to a file, the
string itself is inserted.
If the function returns nil, the `gnus-signature-file' variable will
be used instead.")

(defvar gnus-forward-start-separator 
  "------- Start of forwarded message -------\n"
  "*Delimiter inserted before forwarded messages.")

(defvar gnus-forward-end-separator
  "------- End of forwarded message -------\n"
  "*Delimiter inserted after forwarded messages.")

(defvar gnus-signature-before-forwarded-message t
  "*If non-nil, put the signature before any included forwarded message.")

(defvar gnus-forward-included-headers 
  "^From:\\|^Newsgroups:\\|^Subject:\\|^Date:\\|^Followup-To:\\|^Reply-To:\\|^Organization:\\|^Summary:\\|^Keywords:\\|^To:\\|^Cc:\\|^Posted-To:\\|^Mail-Copies-To:\\|^Apparently-To:\\|^Gnus-Warning:\\|^Resent-\\|^Message-ID:\\|^References:"
  "*Regexp matching headers to be included in forwarded messages.")

(defvar gnus-required-headers
  '(From Date Newsgroups Subject Message-ID Organization Lines X-Newsreader)
  "*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
X-Newsreader are optional.  If you want Gnus not to insert some
header, remove it from this list.")

(defvar gnus-required-mail-headers 
  '(From Date To Subject (optional . In-Reply-To) Message-ID Organization Lines)
  "*Headers to be generated or prompted for when mailing a message.
RFC822 required that From, Date, To, Subject and Message-ID be
included.  Organization, Lines and X-Mailer are optional.")

(defvar gnus-deletable-headers '(Message-ID Date)
  "*Headers to be deleted if they already exists and were generated by Gnus previously.")

(defvar gnus-removable-headers '(NNTP-Posting-Host Xref)
  "*Headers to be removed unconditionally before posting.")

(defvar gnus-ignored-resent-headers "^Return-receipt"
  "*All headers that match this regexp will be deleted when resending a message.")

(defvar gnus-article-expires 14
  "*Number of days before your article expires.
This variable isn't used unless you have the `Expires' element in
`gnus-required-headers'.")

(defvar gnus-distribution-function nil
  "*Function that should return the Distribution header for outgoing articles.
It will be called from the buffer where the outgoing article
is being prepared with the group name as the only parameter.
It should return a valid distribution.  

The function will only be called if you have the `Distribution' header in 
`gnus-required-headers'.")

(defvar gnus-check-before-posting 
  '(subject-cmsg multiple-headers sendsys message-id from
                 long-lines control-chars size new-text
                 redirected-followup signature approved sender 
                 empty empty-headers)
  "In non-nil, Gnus will attempt to run some checks on outgoing posts.
If this variable is t, Gnus will check everything it can.  If it is a
list, then those elements in that list will be checked.")

(defvar gnus-delete-supersedes-headers
  "^Path:\\|^Date\\|^NNTP-Posting-Host:\\|^Supersedes:\\|^Xref:\\|^Lines:"
  "*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.")

(defvar gnus-auto-mail-to-author nil
  "*If non-nil, mail the authors of articles a copy of your follow-ups.
If this variable is `ask', the user will be prompted for whether to
mail a copy.  The string given by `gnus-mail-courtesy-message' will be
inserted at the beginning of the mail copy.")

;; Added by Ethan Bradford <ethanb@ptolemy.astro.washington.edu>.
(defvar gnus-mail-courtesy-message
  "The following message is a courtesy copy of an article\nthat has been posted as well.\n\n"
  "*This is inserted at the start of a mailed copy of a posted message.
If this variable is nil, no such courtesy message will be added.")

(defvar gnus-mail-method 'sendmail
  "*Method to use for composing mail.
There are three legal values: `sendmail' (which is the default), `mh', 
and `vm'.")

(defvar gnus-mail-reply-method (function gnus-mail-reply-using-mail)
  "*Function to compose a reply.
Three pre-made functions are `gnus-mail-reply-using-mail' (sendmail);
`gnus-mail-reply-using-mhe' (MH-E); and `gnus-mail-reply-using-vm'.")

(defvar gnus-mail-forward-method (function gnus-mail-forward-using-mail)
  "*Function to forward the current message to another user.
Three pre-made functions are `gnus-mail-forward-using-mail' (sendmail);
`gnus-mail-forward-using-mhe' (MH-E); and `gnus-mail-forward-using-vm'.") 

(defvar gnus-mail-other-window-method 'gnus-mail-other-window-using-mail
  "*Function to compose mail in the other window.
Three pre-made functions are `gnus-mail-other-window-using-mail'
(sendmail); `gnus-mail-other-window-using-mhe' (MH-E); and
`gnus-mail-other-window-using-vm'.")

(defvar gnus-inews-article-function 'gnus-inews-article
  "*Function to post an article.")

(defvar gnus-bounced-headers-junk "^\\(Received\\):"
  "*Regexp that matches headers to be removed in resent bounced mail.")

(defvar gnus-sent-message-ids-file 
  (concat (file-name-as-directory gnus-article-save-directory)
          "Sent-Message-IDs")
  "File where Gnus saves a cache of sent message ids.")

(defvar gnus-sent-message-ids-length 1000
  "The number of sent Message-IDs to save.")

(defvar gnus-inews-article-hook (list 'gnus-inews-do-fcc)
  "*A hook called before finally posting an article.
The default hook (`gnus-inews-do-fcc') does FCC processing (ie. saves
the article to a file).")

(defvar gnus-inews-article-header-hook nil
  "*A hook called after inserting the headers in an article to be posted.
The hook is called from the *post-news* buffer, narrowed to the
headers.")

(defvar gnus-mail-hook nil
  "*A hook called as the last thing after setting up a mail buffer.")

(defvar gnus-message-sent-hook nil
  "*A hook run after an article has been sent (or attempted sent).")

;;; Internal variables.

(defvar gnus-post-news-buffer "*Post Gnus*")
(defvar gnus-mail-buffer "*Mail Gnus*")
(defvar gnus-article-copy nil)
(defvar gnus-reply-subject nil)
(defvar gnus-newsgroup-followup nil)
(defvar gnus-add-to-address nil)
(defvar gnus-in-reply-to nil)
(defvar gnus-last-posting-server nil)

(eval-and-compile
  (autoload 'gnus-uu-post-news "gnus-uu" nil t)
  (autoload 'news-setup "rnewspost")
  (autoload 'news-reply-mode "rnewspost")
  (autoload 'rmail-dont-reply-to "mail-utils")
  (autoload 'rmail-output "rmailout"))

\f
;;;
;;; Gnus Posting Functions
;;;

(gnus-define-keys 
 (gnus-summary-send-map "S" gnus-summary-mode-map)
 "p" gnus-summary-post-news
 "f" gnus-summary-followup
 "F" gnus-summary-followup-with-original
 "b" gnus-summary-followup-and-reply
 "B" gnus-summary-followup-and-reply-with-original
 "c" gnus-summary-cancel-article
 "s" gnus-summary-supersede-article
 "r" gnus-summary-reply
 "R" gnus-summary-reply-with-original
 "m" gnus-summary-mail-other-window
 "u" gnus-uu-post-news
 "om" gnus-summary-mail-forward
 "op" gnus-summary-post-forward
 "Om" gnus-uu-digest-mail-forward
 "Op" gnus-uu-digest-post-forward)

(gnus-define-keys
 (gnus-send-bounce-map "D" gnus-summary-send-map)
 "b" gnus-summary-resend-bounced-mail
 "c" gnus-summary-send-draft
 "r" gnus-summary-resend-message)

;;; Internal functions.

(defun gnus-number-base36 (num len)
  (if (if (< len 0) (<= num 0) (= len 0))
      ""
    (concat (gnus-number-base36 (/ num 36) (1- len))
            (char-to-string (aref "zyxwvutsrqponmlkjihgfedcba9876543210"
                                  (% num 36))))))

;;; Post news commands of Gnus group mode and summary mode

(defun gnus-group-mail ()
  "Start composing a mail."
  (interactive)
  (gnus-new-mail
   ;; We might want to prompt here.
   (when (and gnus-interactive-post
              (not gnus-expert-user))
     (read-string "To: ")))
  (gnus-configure-windows 'group-mail 'force))

(defun gnus-group-post-news (&optional arg)
  "Post an article.
The newsgroup under the cursor is used as the group to post to.

If you wish to get an empty post buffer, use a prefix ARG.  You can
also do this by calling this function from the bottom of the Group
buffer."
  (interactive "P")
  (let ((gnus-newsgroup-name nil)
        (group (unless arg (gnus-group-group-name))))
    ;; We might want to prompt here.
    (when (and gnus-interactive-post
               (not gnus-expert-user))
      (setq gnus-newsgroup-name
            (setq group 
                  (completing-read "Group: " gnus-active-hashtb nil nil
                                   (cons (or group "") 0)))))
    (gnus-post-news 'post group nil gnus-article-buffer)
    (if (eq major-mode 'news-reply-mode)
        (gnus-configure-windows 'group-post t)
      (gnus-configure-windows 'group-mail t))))

(defun gnus-summary-post-news ()
  "Post an article."
  (interactive)
  (gnus-set-global-variables)
  (gnus-post-news 'post gnus-newsgroup-name))

(defun gnus-summary-followup (yank &optional yank-articles)
  "Compose a followup to an article.
If prefix argument YANK is non-nil, original article is yanked automatically."
  (interactive "P")
  (gnus-set-global-variables)
  (if yank-articles (gnus-summary-goto-subject (car yank-articles)))
  (save-window-excursion
    (gnus-summary-select-article))
  (let ((headers (gnus-summary-article-header (gnus-summary-article-number)))
        (gnus-newsgroup-name gnus-newsgroup-name))
    ;; Check Followup-To: poster.
    (set-buffer gnus-article-buffer)
    (if (and gnus-use-followup-to
             (string-equal "poster" (gnus-fetch-field "followup-to"))
             (or (not (memq gnus-use-followup-to '(t ask)))
                 (not (gnus-y-or-n-p 
                       "Do you want to ignore `Followup-To: poster'? "))))
        ;; Mail to the poster. 
        (progn
          (set-buffer gnus-summary-buffer)
          (gnus-summary-reply yank))
      ;; Send a followup.
      (gnus-post-news nil gnus-newsgroup-name
                      headers gnus-article-buffer 
                      (or yank-articles (not (not yank)))))))

(defun gnus-summary-followup-with-original (n)
  "Compose a followup to an article and include the original article."
  (interactive "P")
  (gnus-summary-followup t (gnus-summary-work-articles n)))

;; Suggested by Daniel Quinlan <quinlan@best.com>.
(defun gnus-summary-followup-and-reply (yank &optional yank-articles)
  "Compose a followup and do an auto mail to author."
  (interactive "P")
  (gnus-set-global-variables)
  (let ((gnus-auto-mail-to-author 'force))
    (gnus-summary-followup yank yank-articles)))

(defun gnus-summary-followup-and-reply-with-original (n)
  "Compose a followup, include the original, and do an auto mail to author."
  (interactive "P")
  (gnus-summary-followup-and-reply t (gnus-summary-work-articles n)))

(defun gnus-summary-cancel-article (n)
  "Cancel an article you posted."
  (interactive "P")
  (gnus-set-global-variables)
  (let ((articles (gnus-summary-work-articles n))
        article)
    (while (setq article (pop articles))
      (when (gnus-summary-select-article t nil nil article)
        (when (gnus-eval-in-buffer-window 
               gnus-original-article-buffer (gnus-cancel-news))
          (gnus-summary-mark-as-read article gnus-canceled-mark))
        (gnus-article-hide-headers-if-wanted))
      (gnus-summary-remove-process-mark article))))

(defun gnus-summary-supersede-article ()
  "Compose an article that will supersede a previous article.
This is done simply by taking the old article and adding a Supersedes
header line with the old Message-ID."
  (interactive)
  (gnus-set-global-variables)
  (gnus-summary-select-article t)
  ;; Check whether the user owns the article that is to be superseded. 
  (unless (string-equal
           (downcase (gnus-mail-strip-quoted-names 
                      (mail-header-from gnus-current-headers)))
           (downcase (gnus-mail-strip-quoted-names (gnus-inews-user-name))))
    (error "This article is not yours."))
  ;; Get a normal *Post News* buffer.
  (gnus-new-news gnus-newsgroup-name t)
  (erase-buffer)
  (insert-buffer-substring gnus-original-article-buffer)
  (nnheader-narrow-to-headers)
  ;; Remove unwanted headers.
  (when gnus-delete-supersedes-headers
    (nnheader-remove-header gnus-delete-supersedes-headers t))
  (goto-char (point-min))
  (if (not (re-search-forward "^Message-ID: " nil t))
      (error "No Message-ID in this article")
    (replace-match "Supersedes: " t t))
  (goto-char (point-max))
  (insert mail-header-separator)
  (widen)
  (forward-line 1))

\f
;;;###autoload
(defalias 'sendnews 'gnus-post-news)

;;;###autoload
(defalias 'postnews 'gnus-post-news)

(defun gnus-copy-article-buffer (&optional article-buffer)
  ;; make a copy of the article buffer with all text properties removed
  ;; this copy is in the buffer gnus-article-copy.
  ;; if ARTICLE-BUFFER is nil, gnus-article-buffer is used
  ;; this buffer should be passed to all mail/news reply/post routines.
  (setq gnus-article-copy (get-buffer-create " *gnus article copy*"))
  (buffer-disable-undo gnus-article-copy)
  (or (memq gnus-article-copy gnus-buffer-list)
      (setq gnus-buffer-list (cons gnus-article-copy gnus-buffer-list)))
  (let ((article-buffer (or article-buffer gnus-article-buffer)))
    (if (and (get-buffer article-buffer)
             (buffer-name (get-buffer article-buffer)))
        (save-excursion
          (set-buffer article-buffer)
          (widen)
          (copy-to-buffer gnus-article-copy (point-min) (point-max))
          (gnus-set-text-properties (point-min) (point-max) 
                                    nil gnus-article-copy)))))

(defun gnus-post-news (post &optional group header article-buffer yank subject)
  "Begin editing a new USENET news article to be posted.
Type \\[describe-mode] in the buffer to get a list of commands."
  (interactive (list t))
  (let* ((group (or group gnus-newsgroup-name))
         (pgroup group)
         to-address to-group mailing-list to-list)
    (when group
      (setq to-address (gnus-group-get-parameter group 'to-address)
            to-group (gnus-group-get-parameter group 'to-group)
            to-list (gnus-group-get-parameter group 'to-list)
            mailing-list (when gnus-mailing-list-groups
                           (string-match gnus-mailing-list-groups group))
            group (gnus-group-real-name group)))
    (if (or (and to-group
                 (gnus-news-group-p to-group))
            (and (gnus-news-group-p 
                  (or pgroup gnus-newsgroup-name)
                  (if header (mail-header-number header) gnus-current-article))
                 (not mailing-list)
                 (not to-list)
                 (not to-address)))
        ;; This is news.
        (if post
            (gnus-new-news (or to-group group))
          (gnus-news-followup yank (or to-group group)))
      ;; The is mail.
      (if post
          (progn
            (gnus-new-mail (or to-address to-list))
            ;; Arrange for mail groups that have no `to-address' to
            ;; get that when the user sends off the mail.
            (unless to-address
              (make-local-variable 'gnus-add-to-address)
              (setq gnus-add-to-address group)))
        (gnus-mail-reply yank to-address 'followup)))))

(defun gnus-post-method (group query-method &optional silent)
  "Return the posting method based on GROUP and query-method.
If SILENT, don't prompt the user."
  (let ((group-method (if (stringp group)
                          (gnus-find-method-for-group group)
                        group)))
    (cond 
     ;; If the group-method is nil (which shouldn't happen) we use 
     ;; the default method.
     ((null group-method)
      (or gnus-post-method gnus-select-method))
     ;; We want this group's method.
     ((and query-method (not (eq query-method 0)))
      group-method)
     ;; We query the user for a post method.
     ((or query-method
          (and gnus-post-method
               (listp (car gnus-post-method))))
      (let* ((methods
              ;; Collect all methods we know about.
              (append
               (when gnus-post-method
                 (if (listp (car gnus-post-method))
                     gnus-post-method
                   (listp gnus-post-method)))
               gnus-secondary-select-methods
               (list gnus-select-method)
               (list group-method)))
             method-alist post-methods method)
        ;; Weed out all mail methods.
        (while methods
          (setq method (gnus-server-get-method "" (pop methods)))
          (when (or (gnus-method-option-p method 'post)
                    (gnus-method-option-p method 'post-mail))
            (push method post-methods)))
        ;; Create a name-method alist.
        (setq method-alist
              (mapcar 
               (lambda (m)
                 (list (concat (cadr m) " (" (symbol-name (car m)) ")") m))
               post-methods))
        ;; Query the user.
        (cadr
         (assoc
          (setq gnus-last-posting-server
                (if (and silent
                         gnus-last-posting-server)
                    ;; Just use the last value.
                    gnus-last-posting-server
                  (completing-read
                   "Posting method: " method-alist nil t
                   (cons (or gnus-last-posting-server "") 0))))
          method-alist))))
     ;; Override normal method.
     ((and gnus-post-method
           (or (gnus-method-option-p group-method 'post)
               (gnus-method-option-p group-method 'post-mail)))
      gnus-post-method)
     ;; Perhaps this is a mail group?
     ((and (not (gnus-member-of-valid 'post group))
           (not (gnus-method-option-p group-method 'post-mail)))
      group-method)
     ;; Use the normal select method.
     (t gnus-select-method))))

(defun gnus-news-group-p (group &optional article)
  "Return non-nil if GROUP (and ARTICLE) come from a news server."
  (or (gnus-member-of-valid 'post group) ; Ordinary news group.
      (and (gnus-member-of-valid 'post-mail group) ; Combined group.
           (eq (gnus-request-type group article) 'news))))
           
(defun gnus-inews-news (&optional use-group-method)
  "Send a news message.

If given a non-zero prefix and the group is a foreign group, this
function will attempt to use the foreign server to post the article.

If given an zero prefix, the user will be prompted for a posting
method to use."
  (interactive "P")
  (unless (gnus-alive-p)
    (error "Gnus is dead; you can't post anything."))
  (or gnus-current-select-method
      (setq gnus-current-select-method gnus-select-method))
  (let* ((case-fold-search nil)
         (reply gnus-article-reply)
         error post-result)
    (save-excursion
      (gnus-start-news-server)          ;Use default server.
      (widen)
      (goto-char (point-min))
      (run-hooks 'news-inews-hook)

      ;; Send to server. 
      (gnus-message 5 "Posting to USENET...")
      (setq post-result (funcall gnus-inews-article-function use-group-method))
      (cond 
       ((eq post-result 'illegal)
        (setq error t)
        (ding))
       (post-result
        (gnus-message 5 "Posting to USENET...done")
        (set-buffer-modified-p nil)
        ;; We mark the article as replied.
        (when (gnus-buffer-exists-p (car-safe reply))
          (save-excursion
            (set-buffer gnus-summary-buffer)
            (gnus-summary-mark-article-as-replied (cdr reply)))))
       (t
        ;; We cannot signal an error.
        (setq error t)
        (ding)
        (gnus-message 
         1 "Article rejected: %s" 
         (gnus-status-message
          (gnus-post-method gnus-newsgroup-name use-group-method t))))))

    (let ((conf gnus-prev-winconf))
      (unless error
        (bury-buffer)
        ;; Restore last window configuration.
        (and conf (set-window-configuration conf))))))

(defun gnus-inews-narrow-to-headers ()
  (widen)
  (narrow-to-region
   (goto-char (point-min))
   (or (and (re-search-forward 
             (concat "^" (regexp-quote mail-header-separator) "$") nil t)
            (match-beginning 0))
       (point-max)))
  (goto-char (point-min)))

(defun gnus-inews-send-mail-copy ()
  ;; Mail the message if To, Bcc or Cc exists.
  (let* ((types '("to" "bcc" "cc"))
         (ty types)
         (buffer (current-buffer)))
    (save-restriction
      (widen)
      (gnus-inews-narrow-to-headers)

      (while ty
        (or (mail-fetch-field (car ty) nil t)
            (setq types (delete (car ty) types)))
        (setq ty (cdr ty)))

      (if (not types)
          ;; We do not want to send mail.
          ()
        (gnus-message 5 "Sending via mail...")
        (widen)
        (save-excursion
          ;; We copy the article over to a temp buffer since we are
          ;; going to modify it a little.  
          (nnheader-set-temp-buffer " *Gnus-mailing*")
          (insert-buffer-substring buffer)
          ;; We remove Fcc, because we don't want the mailer to see
          ;; that header.  
          (gnus-inews-narrow-to-headers)
          (nnheader-remove-header "fcc")

          ;; Insert the X-Courtesy-Message header.
          (and (or (member "to" types)
                   (member "cc" types))
               (progn
                (goto-char (point-max))
                (insert "Posted-To: " 
                        (mail-fetch-field "newsgroups") "\n")))
          
          (widen)
          
          (if (and gnus-mail-courtesy-message
                   (or (member "to" types)
                       (member "cc" types)))
              ;; We only want to insert the courtesy mail message if
              ;; we use To or Cc; Bcc should not have one. Well, if
              ;; both Bcc and To are present, it will get one
              ;; anyway.
              (progn
                ;; Insert "courtesy" mail message.
                (goto-char (point-min))
                (re-search-forward
                 (concat "^" (regexp-quote mail-header-separator) "$"))
                (forward-line 1)
                (insert gnus-mail-courtesy-message)))

          (gnus-mail-send t)
          (kill-buffer (current-buffer))
          (gnus-message 5 "Sending via mail...done"))))))

(defun gnus-inews-remove-headers-after-mail ()
  (save-excursion
    (save-restriction
      (let ((case-fold-search t))
        (gnus-inews-narrow-to-headers)
        ;; Remove Bcc completely.
        (nnheader-remove-header "bcc")
        ;; We transform To and Cc headers to avoid re-mailing if the user
        ;; accidentally (or purposefully) leans on the `C-c C-c' keys
        ;; and the news server rejects the posting.
        (while (re-search-forward "^\\(to\\|[bcf]cc\\|cc\\):" nil t)
          (beginning-of-line)
          (insert "X-"))
        (widen)))))

(defun gnus-inews-dex-headers ()
  "Remove \"X-\" prefixes from To and Cc headers."
  (save-excursion
    (save-restriction
      (let ((case-fold-search t))
        (nnheader-narrow-to-headers)
        (while (re-search-forward "^X-\\(to\\|[bcf]cc\\|cc\\):" nil t)
          (beginning-of-line)
          (delete-char 2))
        (widen)))))

(defun gnus-inews-remove-empty-headers ()
  "Remove empty headers from news and mail.
The buffer should be narrowed to the headers before this function is
called."
  (save-excursion
    (goto-char (point-min))
    (while (re-search-forward "^[^ \t:]+:\\([ \t]*\n\\)+[^ \t]" nil t)
      (delete-region (match-beginning 0) (1- (match-end 0)))
      (beginning-of-line))))

(defun gnus-inews-check-post ()
  "Check whether the post looks ok."
  (or
   (not gnus-check-before-posting)
   (and 
    ;; We narrow to the headers and check them first.
    (save-excursion
      (save-restriction
        (gnus-inews-narrow-to-headers)
        (and 
         ;; Check for commands in Subject.
         (or 
          (gnus-check-before-posting 'subject-cmsg)
          (save-excursion
            (if (string-match "^cmsg " (mail-fetch-field "subject"))
                (gnus-y-or-n-p
                 "The control code \"cmsg \" is in the subject. Really post? ")
              t)))
         ;; Check for multiple identical headers.
         (or (gnus-check-before-posting 'multiple-headers)
             (save-excursion
               (let (found)
                 (while (and (not found) 
                             (re-search-forward "^[^ \t:]+: " nil t))
                   (save-excursion
                     (or (re-search-forward 
                          (concat "^" (setq found
                                            (buffer-substring 
                                             (match-beginning 0) 
                                             (- (match-end 0) 2))))
                          nil t)
                         (setq found nil))))
                 (if found
                     (gnus-y-or-n-p 
                      (format "Multiple %s headers. Really post? " found))
                   t))))
         ;; Check for Version and Sendsys.
         (or (gnus-check-before-posting 'sendsys)
             (save-excursion
               (if (re-search-forward "^Sendsys:\\|^Version:" nil t)
                   (gnus-y-or-n-p
                    (format "The article contains a %s command. Really post? "
                            (buffer-substring (match-beginning 0) 
                                              (1- (match-end 0)))))
                 t)))
         ;; Check for Approved.
         (or (gnus-check-before-posting 'approved)
             (save-excursion
               (if (re-search-forward "^Approved:" nil t)
                   (gnus-y-or-n-p
                    "The article contains an Approved header. Really post? ")
                 t)))
         ;; Check whether a Followup-To has redirected the newsgroup.
         (or
          (gnus-check-before-posting 'redirected-followup)
          (not gnus-newsgroup-followup)
          (save-excursion
            (let ((followups (gnus-tokenize-header
                              (mail-fetch-field "Newsgroups")))
                  (newsgroups (gnus-tokenize-header
                               (car gnus-newsgroup-followup))))
              (while (and followups
                          (member (car followups) newsgroups))
                (setq followups (cdr followups)))
              (if (not followups)
                  t
                (gnus-y-or-n-p
                 "Followup redirected from original newsgroups.  Really post? "
                 )))))
         ;; Check the Message-ID header.
         (or (gnus-check-before-posting 'message-id)
             (save-excursion
               (let* ((case-fold-search t)
                      (message-id (mail-fetch-field "message-id")))
                 (or (not message-id)
                     (and (string-match "@" message-id)
                          (string-match "@[^\\.]*\\." message-id))
                     (gnus-y-or-n-p
                      (format 
                       "The Message-ID looks strange: \"%s\". Really post? "
                       message-id))))))
         ;; Check whether any headers are empty.
         (or (gnus-check-before-posting 'empty-headers)
             (save-excursion
               (let ((post t))
                 (goto-char (point-min))
                 (while (and post (not (eobp)))
                   (when (looking-at "\\([^ :]+\\):[ \t]\n[^ \t]")
                     (setq post
                           (gnus-y-or-n-p
                            (format
                             "The %s header is empty.  Really post? "
                             (match-string 1)))))
                   (forward-line 1))
                 post)))
         ;; Check the From header.
         (or 
          (gnus-check-before-posting 'from)
          (save-excursion
            (let* ((case-fold-search t)
                   (from (mail-fetch-field "from")))
              (cond
               ((not from)
                (gnus-y-or-n-p "There is no From line. Really post? "))
               ((not (string-match "@[^\\.]*\\." from))
                (gnus-y-or-n-p
                 (format 
                  "The address looks strange: \"%s\". Really post? " from)))
               ((string-match "(.*).*(.*)" from)
                (gnus-y-or-n-p
                 (format
                  "The From header looks strange: \"%s\". Really post? " 
                  from)))
               ((string-match "<[^>]+> *$" from)
                (let ((name (substring from 0 (match-beginning 0))))
                  (or 
                   (string-match "^ *\"[^\"]*\" *$" name)
                   (not (string-match "[][.!()<>@,;:\\]" name))
                   (gnus-y-or-n-p
                    (format
                     "The From header name has bogus characters.  Really post? " 
                     from)))))
               (t t)))))
         )))
    ;; Check for long lines.
    (or (gnus-check-before-posting 'long-lines)
        (save-excursion
          (goto-char (point-min))
          (re-search-forward
           (concat "^" (regexp-quote mail-header-separator) "$"))
          (while (and
                  (progn
                    (end-of-line)
                    (< (current-column) 80))
                  (zerop (forward-line 1))))
          (or (bolp)
              (eobp)
              (gnus-y-or-n-p
               "You have lines longer than 79 characters.  Really post? "))))
    ;; Check whether the article is empty.
    (or (gnus-check-before-posting 'empty)
        (save-excursion
          (goto-char (point-min))
          (re-search-forward
           (concat "^" (regexp-quote mail-header-separator) "$"))
          (forward-line 1)
          (or (re-search-forward "[^ \n\t]" nil t)
              (gnus-y-or-n-p "Empty article.  Really post?"))))
    ;; Check for control characters.
    (or (gnus-check-before-posting 'control-chars)
        (save-excursion
          (if (re-search-forward "[\000-\007\013\015-\037\200-\237]" nil t)
              (gnus-y-or-n-p 
               "The article contains control characters. Really post? ")
            t)))
    ;; Check excessive size.
    (or (gnus-check-before-posting 'size)
        (if (> (buffer-size) 60000)
            (gnus-y-or-n-p
             (format "The article is %d octets long. Really post? "
                     (buffer-size)))
          t))
    ;; Use the (size . checksum) variable to see whether the
    ;; article is empty or has only quoted text.
    (or
     (gnus-check-before-posting 'new-text)
     (not gnus-article-check-size)
     (if (and (= (buffer-size) (car gnus-article-check-size))
              (= (gnus-article-checksum) (cdr gnus-article-check-size)))
         (gnus-y-or-n-p
          "It looks like there's no new text in your article. Really post? ")
       t))
    ;; Check the length of the signature.
    (or (gnus-check-before-posting 'signature)
        (progn
          (goto-char (point-max))
          (if (not (re-search-backward gnus-signature-separator nil t))
              t
            (if (> (count-lines (point) (point-max)) 5)
                (gnus-y-or-n-p
                 (format
                  "Your .sig is %d lines; it should be max 4.  Really post? "
                  (count-lines (point) (point-max))))
              t)))))))

(defvar gnus-inews-sent-ids nil)

(defun gnus-inews-reject-message ()
  "Check whether this message has already been sent."
  (when gnus-sent-message-ids-file
    (let ((message-id (save-restriction (gnus-inews-narrow-to-headers)
                                        (mail-fetch-field "message-id")))
          end)
      (when message-id
        (unless gnus-inews-sent-ids
          (condition-case ()
              (load  t t t)
            (error nil)))
        (if (member message-id gnus-inews-sent-ids)
            ;; Reject this message.
            (not (gnus-yes-or-no-p 
                  (format "Message %s already sent.  Send anyway? "
                          message-id)))
          (push message-id gnus-inews-sent-ids)
          ;; Chop off the last Message-IDs.
          (when (setq end (nthcdr gnus-sent-message-ids-length 
                                  gnus-inews-sent-ids))
            (setcdr end nil))
          (nnheader-temp-write gnus-sent-message-ids-file
            (prin1 `(setq gnus-inews-sent-ids ',gnus-inews-sent-ids)
                   (current-buffer)))
          nil)))))

(defun gnus-tokenize-header (header &optional separator)
  "Split HEADER into a list of header elements.
\",\" is used as the separator."
  (let* ((beg 0)
         (separator (or separator ","))
         (regexp
          (format "[ \t]*\\([^%s]+\\)?\\([%s]+\\|\\'\\)" separator separator))
         elems)
    (while (and (string-match regexp header beg)
                (< beg (length header)))
      (when (match-beginning 1)
        (push (match-string 1 header) elems))
      (setq beg (match-end 0)))
    (nreverse elems)))

(defun gnus-article-checksum ()
  (let ((sum 0))
    (save-excursion
      (while (not (eobp))
        (setq sum (logxor sum (following-char)))
        (forward-char 1)))
    sum))

;; Returns non-nil if this type is not to be checked.
(defun gnus-check-before-posting (type)
  (not 
   (or (not gnus-check-before-posting)
       (if (listp gnus-check-before-posting)
           (memq type gnus-check-before-posting)
         t))))

(defun gnus-cancel-news ()
  "Cancel an article you posted."
  (interactive)
  (if (or gnus-expert-user
          (gnus-yes-or-no-p "Do you really want to cancel this article? "))
      (let ((from nil)
            (newsgroups nil)
            (message-id nil)
            (distribution nil))
        (or (gnus-news-group-p gnus-newsgroup-name)
            (error "This backend does not support canceling"))
        (save-excursion
          ;; Get header info. from original article.
          (save-restriction
            (gnus-article-show-all-headers)
            (goto-char (point-min))
            (search-forward "\n\n" nil 'move)
            (narrow-to-region (point-min) (point))
            (setq from (mail-fetch-field "from"))
            (setq newsgroups (mail-fetch-field "newsgroups"))
            (setq message-id (mail-fetch-field "message-id"))
            (setq distribution (mail-fetch-field "distribution")))
          ;; Verify if the article is absolutely user's by comparing
          ;; user id with value of its From: field.
          (if (not
               (string-equal
                (downcase (gnus-mail-strip-quoted-names from))
                (downcase (gnus-mail-strip-quoted-names
                           (gnus-inews-user-name)))))
              (progn
                (ding) (gnus-message 3 "This article is not yours.")
                nil)
            ;; Make control article.
            (set-buffer (get-buffer-create " *Gnus-canceling*"))
            (buffer-disable-undo (current-buffer))
            (erase-buffer)
            (insert "Newsgroups: " newsgroups "\n"
                    "From: " (gnus-inews-user-name) "\n"
                    "Subject: cancel " message-id "\n"
                    "Control: cancel " message-id "\n"
                    (if distribution
                        (concat "Distribution: " distribution "\n")
                      "")
                    mail-header-separator "\n"
                    "This is a cancel message from " from ".\n")
            ;; Send the control article to NNTP server.
            (gnus-message 5 "Canceling your article...")
            (prog1
                (if (funcall gnus-inews-article-function)
                    (gnus-message 5 "Canceling your article...done")
                  (progn
                    (ding) 
                    (gnus-message 1 "Cancel failed; %s" 
                                  (gnus-status-message gnus-newsgroup-name))
                    nil)
                  t)
              ;; Kill the article buffer.
              (kill-buffer (current-buffer))))))))

(defun gnus-inews-remove-signature ()
  "Remove the signature from the text between point and mark.
The text will also be indented the normal way.
This function can be used in `mail-citation-hook', for instance."
  (save-excursion
    (let ((start (point))
          mark)
    (if (not (re-search-forward gnus-signature-separator (mark t) t))
        ;; No signature here, so we just indent the cited text.
        (mail-indent-citation)
      ;; Find the last non-empty line.
      (forward-line -1)
      (while (looking-at "[ \t]*$")
        (forward-line -1))
      (forward-line 1)
      (setq mark (set-marker (make-marker) (point)))
      (goto-char start)
      (mail-indent-citation)
      ;; Enable undoing the deletion.
      (undo-boundary)
      (delete-region mark (mark t))
      (set-marker mark nil)))))

\f

;; Dummy to avoid byte-compile warning.
(defvar nnspool-rejected-article-hook)

(defun gnus-inews-article (&optional use-group-method)
  "Post an article in current buffer using NNTP protocol."
  (let ((artbuf (current-buffer))
        gcc result)
    (widen)
    (goto-char (point-max))
    ;; Require a newline at the end of the buffer since inews may
    ;; append a .signature.
    (or (= (preceding-char) ?\n)
        (insert ?\n))
    ;; Prepare article headers.  All message body such as signature
    ;; must be inserted before Lines: field is prepared.
    (save-restriction
      (gnus-inews-narrow-to-headers)
      ;; Fix some headers.
      (gnus-inews-cleanup-headers)
      ;; Remove some headers.
      (gnus-inews-remove-headers)
      ;; Insert some headers.
      (gnus-inews-insert-headers)
      ;; Let the user do all of the above.
      (run-hooks 'gnus-inews-article-header-hook)
      ;; Copy the Gcc header, if any.
      (setq gcc (mail-fetch-field "gcc"))
      (widen))
    ;; Check whether the article is a good Net Citizen.
    (if (not (gnus-inews-check-post))
        ;; Aber nein!
        'illegal
      ;; We fudge a hook for nnspool.
      (setq nnspool-rejected-article-hook
            `((lambda ()
                (condition-case ()
                    (save-excursion
                      (set-buffer ,(buffer-name))
                      (gnus-associate-buffer-with-draft nil 'silent))
                  (error 
                   (ding)
                   (gnus-message 
                    1 "Couldn't enter rejected article into draft group"))))))
                                   
      ;; Looks ok, so we do the nasty.
      (save-excursion
        ;; This hook may insert a signature.
        (save-excursion
          (goto-char (point-min))
          (let ((gnus-newsgroup-name (or (mail-fetch-field "newsgroups")
                                         gnus-newsgroup-name)))
            (run-hooks 'gnus-prepare-article-hook)))
        ;; Send off copies using mail, if that is wanted.
        (gnus-inews-send-mail-copy)
        ;; Remove more headers.
        (gnus-inews-remove-headers-after-mail)
        ;; Copy the article over to a temp buffer.
        (nnheader-set-temp-buffer " *Gnus-posting*")
        (insert-buffer-substring artbuf)
        ;; Remove the header separator.
        (goto-char (point-min))
        (re-search-forward
         (concat "^" (regexp-quote mail-header-separator) "$"))
        (replace-match "" t t)
        ;; Remove X- prefixes to headers.
        (gnus-inews-dex-headers)
        ;; Run final inews hooks.  This hook may do FCC.
        ;; The article must be saved before being posted because
        ;; `gnus-request-post' modifies the buffer.
        (run-hooks 'gnus-inews-article-hook)
        ;; Copy the article over to some group, possibly.
        (and gcc (gnus-inews-do-gcc gcc))
        ;; Post the article.
        (setq result (gnus-request-post
                      (gnus-post-method gnus-newsgroup-name use-group-method)))
        (kill-buffer (current-buffer)))
      (run-hooks 'gnus-message-sent-hook)
      ;; If the posting was unsuccessful (that it, it was rejected) we
      ;; put it into the draft group.
      (or result (gnus-associate-buffer-with-draft))
      result)))

(defun gnus-inews-cleanup-headers ()
  ;; Remove empty lines in the header.
  (save-restriction
    (gnus-inews-narrow-to-headers)
    (while (re-search-forward "^[ \t]*\n" nil t)
      (replace-match "" t t)))

  ;; Correct newsgroups field: change sequence of spaces to comma and 
  ;; eliminate spaces around commas.  Eliminate imbedded line breaks.
  (goto-char (point-min))
  (when (re-search-forward "^Newsgroups: +" nil t)
    (save-restriction
      (narrow-to-region
       (point)
       (if (re-search-forward "^[^ \t]" nil t)
           (match-beginning 0)
         (forward-line 1)
         (point)))
      (goto-char (point-min))
      (while (re-search-forward "\n[ \t]+" nil t)
        (replace-match " " t t))        ;No line breaks (too confusing)
      (goto-char (point-min))
      (while (re-search-forward "[ \t\n]*,[ \t\n]*\\|[ \t]+" nil t)
        (replace-match "," t t))
      (goto-char (point-min))
      ;; Remove trailing commas.
      (when (re-search-forward ",+$" nil t)
        (replace-match "" t t))))
 
  ;; Added by Per Abrahamsen <abraham@iesd.auc.dk>.
  ;; Help save the the world!
  (unless gnus-expert-user
    (let ((newsgroups (mail-fetch-field "newsgroups"))
          (followup-to (mail-fetch-field "followup-to"))
          to)
      (when (and newsgroups (string-match "," newsgroups)
                 (not followup-to)
                 (not
                  (zerop
                   (length
                    (setq to (completing-read 
                              "Followups to: (default all groups) " 
                              (mapcar (lambda (g) (list g))
                                      (cons "poster" 
                                            (gnus-tokenize-header 
                                             newsgroups)))))))))
        (goto-char (point-min))
        (insert "Followup-To: " to "\n"))))

  ;; Cleanup Followup-To.
  (goto-char (point-min))
  (when (search-forward-regexp "^Followup-To: +" nil t)
    (save-restriction
      (narrow-to-region
       (point)
       (if (re-search-forward "^[^ \t]" nil 'end)
           (match-beginning 0)
         (point-max)))
      (goto-char (point-min))
      ;; No line breaks (too confusing)
      (while (re-search-forward "\n[ \t]+" nil t )
        (replace-match " " t ))
      (goto-char (point-min))
      (while (re-search-forward "[ \t\n]*,[ \t\n]*\\|[ \t]+" nil t)
        (replace-match "," t t)))))

(defun gnus-inews-remove-headers ()
  (let ((case-fold-search t)
        (headers gnus-removable-headers))
    ;; Remove toxic headers.
    (while headers
      (goto-char (point-min))
      (and (re-search-forward 
            (concat "^" (downcase (format "%s" (car headers))))
            nil t)
           (delete-region (progn (beginning-of-line) (point))
                          (progn (forward-line 1) (point))))
      (setq headers (cdr headers)))))

;;; Since the X-Newsreader/X-Mailer are ``vanity'' headers, they might
;;; as well include the Emacs version as well.
;;; The following function works with later GNU Emacs, and XEmacs.
(defun gnus-extended-version ()
  "Stringified Gnus version and Emacs version"
  (interactive)
  (concat
   gnus-version
   "/"
   (cond
    ((string-match "^\\([0-9]+\\.[0-9]+\\)\\.[.0-9]+$" emacs-version)
     (concat "Emacs " (substring emacs-version
                                 (match-beginning 1)
                                 (match-end 1))))
    ((string-match "\\([A-Z]*[Mm][Aa][Cc][Ss]\\)" emacs-version)
     (concat (substring emacs-version
                        (match-beginning 1)
                        (match-end 1))
             (format " %d.%d" emacs-major-version emacs-minor-version)))
    (t emacs-version))))

(defun gnus-inews-insert-headers (&optional headers)
  "Prepare article headers.
Headers already prepared in the buffer are not modified.
Headers in `gnus-required-headers' will be generated."
  (let* ((Date (gnus-inews-date))
         (Message-ID (gnus-inews-message-id))
         (Organization (gnus-inews-organization))
         (From (gnus-inews-user-name))
         (Path (gnus-inews-path))
         (Subject nil)
         (Newsgroups nil)
         (In-Reply-To (gnus-inews-in-reply-to))
         (To nil)
         (Distribution (gnus-inews-distribution))
         (Lines (gnus-inews-lines))
         (X-Newsreader (gnus-extended-version))
         (X-Mailer X-Newsreader)
         (Expires (gnus-inews-expires))
         (headers (or headers gnus-required-headers))
         (case-fold-search t)
         header value elem)
    ;; First we remove any old generated headers.
    (let ((headers gnus-deletable-headers))
      (while headers
        (goto-char (point-min))
        (and (re-search-forward 
              (concat "^" (symbol-name (car headers)) ": *") nil t)
             (get-text-property (1+ (match-beginning 0)) 'gnus-deletable)
             (gnus-delete-line))
        (setq headers (cdr headers))))
    ;; If there are References, and no "Re: ", then the thread has
    ;; changed name. See Son-of-1036.
    (if (and (mail-fetch-field "references")
             (get-buffer gnus-article-buffer))
        (let ((psubject (gnus-simplify-subject-re
                         (mail-fetch-field "subject"))))
          (or (and psubject gnus-reply-subject 
                   (string= (gnus-simplify-subject-re gnus-reply-subject)
                            psubject))
              (progn
                (string-match "@" Message-ID)
                (setq Message-ID
                      (concat (substring Message-ID 0 (match-beginning 0))
                              "_-_" 
                              (substring Message-ID (match-beginning 0))))))))
    ;; Go through all the required headers and see if they are in the
    ;; articles already. If they are not, or are empty, they are
    ;; inserted automatically - except for Subject, Newsgroups and
    ;; Distribution. 
    (while headers
      (goto-char (point-min))
      (setq elem (pop headers))
      (if (consp elem)
          (setq header (car elem))
        (setq header elem))
      (when (or (not (re-search-forward 
                      (concat "^" (downcase (symbol-name header)) ":") nil t))
                (progn
                  ;; The header was found. We insert a space after the
                  ;; colon, if there is none.
                  (if (/= (following-char) ? ) (insert " "))
                  ;; Find out whether the header is empty...
                  (looking-at "[ \t]*$")))
        ;; So we find out what value we should insert.
        (setq value
              (cond 
               ((and (consp elem) (eq (car elem) 'optional))
                ;; This is an optional header.  If the cdr of this
                ;; is something that is nil, then we do not insert
                ;; this header.
                (setq header (cdr elem))
                (or (and (fboundp (cdr elem)) (funcall (cdr elem)))
                    (and (boundp (cdr elem)) (symbol-value (cdr elem)))))
               ((consp elem)
                ;; The element is a cons.  Either the cdr is a
                ;; string to be inserted verbatim, or it is a
                ;; function, and we insert the value returned from
                ;; this function.
                (or (and (stringp (cdr elem)) (cdr elem))
                    (and (fboundp (cdr elem)) (funcall (cdr elem)))))
               ((and (boundp header) (symbol-value header))
                ;; The element is a symbol.  We insert the value
                ;; of this symbol, if any.
                (symbol-value header))
               (t
                ;; We couldn't generate a value for this header,
                ;; so we just ask the user.
                (read-from-minibuffer
                 (format "Empty header for %s; enter value: " header)))))
        ;; Finally insert the header.
        (when (and value 
                   (not (equal value "")))
          (save-excursion
            (if (bolp)
                (progn
                  ;; This header didn't exist, so we insert it.
                  (goto-char (point-max))
                  (insert (symbol-name header) ": " value "\n")
                  (forward-line -1))
              ;; The value of this header was empty, so we clear
              ;; totally and insert the new value.
              (delete-region (point) (gnus-point-at-eol))
              (insert value))
            ;; Add the deletable property to the headers that require it.
            (and (memq header gnus-deletable-headers)
                 (progn (beginning-of-line) (looking-at "[^:]+: "))
                 (add-text-properties 
                  (point) (match-end 0)
                  '(gnus-deletable t face italic) (current-buffer)))))))
    ;; Insert new Sender if the From is strange. 
    (let ((from (mail-fetch-field "from"))
          (sender (mail-fetch-field "sender"))
          (secure-sender (gnus-inews-real-user-address)))
      (when (and from 
                 (not (gnus-check-before-posting 'sender))
                 (not (string=
                       (downcase (cadr (gnus-extract-address-components from)))
                       (downcase (gnus-inews-real-user-address))))
                 (or (null sender)
                     (not 
                      (string=
                       (downcase
                        (cadr (gnus-extract-address-components sender)))
                       (downcase secure-sender)))))
        (goto-char (point-min))    
        ;; Rename any old Sender headers to Original-Sender.
        (when (re-search-forward "^Sender:" nil t)
          (beginning-of-line)
          (insert "Original-")
          (beginning-of-line))
        (insert "Sender: " secure-sender "\n")))))

(defun gnus-inews-insert-signature ()
  "Insert a signature file.
If `gnus-signature-function' is bound and returns a string, this
string is used instead of the variable `gnus-signature-file'.
In either case, if the string is a file name, this file is
inserted. If the string is not a file name, the string itself is
inserted. 

If you never want any signature inserted, set both of these variables to
nil."
  (save-excursion
    (let ((signature 
           (or (and gnus-signature-function
                    (funcall gnus-signature-function gnus-newsgroup-name))
               gnus-signature-file)))
      (if (and signature
               (or (file-exists-p signature)
                   (string-match " " signature)
                   (not (string-match 
                         "^/[^/]+/" (expand-file-name signature)))))
          (progn
            (goto-char (point-max))
            (if (and mail-signature (search-backward "\n-- \n" nil t))
                ()
              ;; Delete any previous signatures.
              (if (search-backward "\n-- \n" nil t)
                  (delete-region (point) (point-max)))
              (or (eolp) (insert "\n"))
              (insert "-- \n")
              (if (file-exists-p signature)
                  (insert-file-contents signature)
                (insert signature))
              (goto-char (point-max))
              (or (bolp) (insert "\n"))))))))

;; Written by "Mr. Per Persson" <pp@solace.mh.se>.
(defun gnus-inews-insert-mime-headers ()
  (goto-char (point-min))
  (let ((mail-header-separator 
         (progn 
           (goto-char (point-min))
           (if (and (search-forward (concat "\n" mail-header-separator "\n")
                                    nil t)
                    (not (search-backward "\n\n" nil t)))
               mail-header-separator
             ""))))
    (or (mail-position-on-field "Mime-Version")
        (insert "1.0")
        (cond ((save-restriction
                 (widen)
                 (goto-char (point-min))
                 (re-search-forward "[\200-\377]" nil t))
               (or (mail-position-on-field "Content-Type")
                   (insert "text/plain; charset=ISO-8859-1"))
               (or (mail-position-on-field "Content-Transfer-Encoding")
                   (insert "8bit")))
              (t (or (mail-position-on-field "Content-Type")
                     (insert "text/plain; charset=US-ASCII"))
                 (or (mail-position-on-field "Content-Transfer-Encoding")
                     (insert "7bit")))))))

(defun gnus-inews-do-fcc ()
  "Process Fcc headers in the current buffer.
Unless the first character of the field is `|', the article is saved
to the specified file using the function specified by the variable
gnus-author-copy-saver.  The default function rmail-output saves in
Unix mailbox format.

If the first character is `|', the contents of the article is sent to
a program specified by the rest of the value."
  (let ((case-fold-search t)            ;Should ignore case.
        list file)
    (save-excursion
      (save-restriction
        (nnheader-narrow-to-headers)
        (while (setq file (mail-fetch-field "fcc"))
          (push file list)
          (nnheader-remove-header "fcc" nil t))
        ;; Process FCC operations.
        (widen)
        (while list
          (setq file (pop list))
          (if (string-match "^[ \t]*|[ \t]*\\(.*\\)[ \t]*$" file)
              ;; Pipe the article to the program in question.
              (call-process-region (point-min) (point-max) shell-file-name
                                   nil nil nil "-c" (match-string 1 file))
            ;; Save the article.
            (setq file (expand-file-name file))
            (gnus-make-directory (file-name-directory file))
            (if (and gnus-author-copy-saver
                     (not (eq gnus-author-copy-saver 'rmail-output)))
                (funcall gnus-author-copy-saver file)
              (if (and (file-readable-p file) (mail-file-babyl-p file))
                  (gnus-output-to-rmail file)
                (let ((mail-use-rfc822 t))
                  (rmail-output file 1 t t))))))))))

(defun gnus-inews-path ()
  "Return uucp path."
  (let ((login-name (gnus-inews-login-name)))
    (cond ((null gnus-use-generic-path)
           (concat (nth 1 gnus-select-method) "!" login-name))
          ((stringp gnus-use-generic-path)
           ;; Support GENERICPATH.  Suggested by vixie@decwrl.dec.com.
           (concat gnus-use-generic-path "!" login-name))
          (t login-name))))

(defun gnus-inews-user-name ()
  "Return user's network address as \"NAME@DOMAIN (FULL-NAME)\"."
  (let ((full-name (gnus-inews-full-name))
        (address (if (or gnus-user-login-name gnus-use-generic-from
                         gnus-local-domain (getenv "DOMAINNAME"))
                     (concat (gnus-inews-login-name) "@"
                             (gnus-inews-domain-name gnus-use-generic-from))
                   user-mail-address))) 
    (or gnus-user-from-line
        (concat address
                ;; User's full name.
                (cond ((string-equal full-name "&") ;Unix hack.
                       (concat " (" (user-login-name) ")"))
                      ((string-match "[^ ]+@[^ ]+ +(.*)" address)
                       "")
                      (t
                       (concat " (" full-name ")")))))))

(defun gnus-inews-real-user-address ()
  "Return the \"real\" user address.
This function tries to ignore all user modifications, and 
give as trustworthy answer as possible."
  (concat (user-login-name) "@" (system-name)))

(defun gnus-inews-login-name ()
  "Return login name."
  (or gnus-user-login-name (getenv "LOGNAME") (user-login-name)))

(defun gnus-inews-full-name ()
  "Return full user name."
  (or gnus-user-full-name (getenv "NAME") (user-full-name)))

(defun gnus-inews-domain-name (&optional genericfrom)
  "Return user's domain name.
If optional argument GENERICFROM is a string, use it as the domain
name; if it is non-nil, strip off local host name from the domain name.
If the function `system-name' returns full internet name and the
domain is undefined, the domain name is got from it."
  (if (or genericfrom gnus-local-domain (getenv "DOMAINNAME"))
      (let* ((system-name (system-name))
             (domain 
              (or (if (stringp genericfrom) genericfrom)
                  (getenv "DOMAINNAME")
                  (and (boundp 'mail-host-address)
                       mail-host-address)
                  gnus-local-domain
                  ;; Function `system-name' may return full internet name.
                  ;; Suggested by Mike DeCorte <mrd@sun.soe.clarkson.edu>.
                  (if (string-match "\\.." system-name)
                      ;; Some machines return "name.", and that's not
                      ;; very nice. 
                      (substring system-name (1- (match-end 0))))
                  (read-string "Domain name (no host): ")))
             (host (or (if (string-match "\\." system-name)
                           (substring system-name 0 (match-beginning 0)))
                       system-name)))
        (if (string-equal "." (substring domain 0 1))
            (setq domain (substring domain 1)))
        ;; Support GENERICFROM as same as standard Bnews system.
        ;; Suggested by ohm@kaba.junet and vixie@decwrl.dec.com.
        (cond ((null genericfrom)
               (concat host "." domain))
              ;;((stringp genericfrom) genericfrom)
              (t domain)))
    (if (string-match "\\." (system-name))
        (system-name)
      (if (string-match "@\\([^ ]+\\)\\($\\| \\)" user-mail-address)
          (substring user-mail-address 
                     (match-beginning 1) (match-end 1))
        "bogus-domain"))))

(defun gnus-inews-full-address ()
  (let ((domain (gnus-inews-domain-name))
        (system (system-name))
        (case-fold-search t))
    (if (string-match "\\." system) system
      (if (string-match (concat "^" (regexp-quote system)) domain) domain
        (concat system "." domain)))))

(defun gnus-inews-expires ()
  "Return an Expires header based on `gnus-article-expires'."
  (let ((current (current-time))
        (future (* 1.0 gnus-article-expires 60 60 24)))
    ;; Add the future to current.
    (setcar current (+ (car current) (round (/ future (expt 2 16)))))
    (setcar (cdr current) (+ (nth 1 current) (% (round future) (expt 2 16))))
    ;; Return the date in the future in UT.
    (timezone-make-date-arpa-standard 
     (current-time-string current) (current-time-zone) '(0 "UT"))))

(defun gnus-inews-distribution ()
  "Return the current Distribution header, if any."
  (when (and gnus-distribution-function
             (fboundp gnus-distribution-function))
    (funcall gnus-distribution-function (or gnus-newsgroup-name ""))))

(defun gnus-inews-message-id ()
  "Generate unique Message-ID for user."
  ;; Message-ID should not contain a slash and should be terminated by
  ;; a number.  I don't know the reason why it is so.
  (concat "<" (gnus-inews-unique-id) "@" (gnus-inews-full-address) ">"))

(defvar gnus-unique-id-char nil)

;; If you ever change this function, make sure the new version
;; cannot generate IDs that the old version could.
;; You might for example insert a "." somewhere (not next to another dot
;; or string boundary), or modify the newsreader name to "Ding".
(defun gnus-inews-unique-id ()
  ;; Don't use microseconds from (current-time), they may be unsupported.
  ;; Instead we use this randomly inited counter.
  (setq gnus-unique-id-char
        (% (1+ (or gnus-unique-id-char (logand (random t) (1- (lsh 1 20)))))
           ;; (current-time) returns 16-bit ints,
           ;; and 2^16*25 just fits into 4 digits i base 36.
           (* 25 25)))
  (let ((tm (if (fboundp 'current-time)
                (current-time) '(12191 46742 287898))))
    (concat
     (if (memq system-type '(ms-dos emx vax-vms))
         (let ((user (downcase (gnus-inews-login-name))))
           (while (string-match "[^a-z0-9_]" user)
             (aset user (match-beginning 0) ?_))
           user)
       (gnus-number-base36 (user-uid) -1))
     (gnus-number-base36 (+ (car   tm) (lsh (% gnus-unique-id-char 25) 16)) 4)
     (gnus-number-base36 (+ (nth 1 tm) (lsh (/ gnus-unique-id-char 25) 16)) 4)
     ;; Append the newsreader name, because while the generated
     ;; ID is unique to this newsreader, other newsreaders might
     ;; otherwise generate the same ID via another algorithm.
     ".fsf")))

(defun gnus-inews-date ()
  "Current time string."
  (let ((now (current-time)))
    (timezone-make-date-arpa-standard 
     (current-time-string now) (current-time-zone now))))

(defun gnus-inews-organization ()
  "Return user's organization.
The ORGANIZATION environment variable is used if defined.
If not, the variable `gnus-local-organization' is used instead.
If it is a function, the function will be called with the current
newsgroup name as the argument.
If this is a file name, the contents of this file will be used as the
organization."
  (let* ((organization 
          (or (getenv "ORGANIZATION")
              (if gnus-local-organization
                  (if (gnus-functionp gnus-local-organization)
                      (funcall gnus-local-organization gnus-newsgroup-name)
                    gnus-local-organization))
              gnus-organization-file
              "~/.organization")))
    (and (stringp organization)
         (> (length organization) 0)
         (or (file-exists-p organization)
             (string-match " " organization)
             (not (string-match "^/usr/lib/\\|^~/" organization)))
         (save-excursion
           (gnus-set-work-buffer)
           (if (file-exists-p organization)
               (insert-file-contents organization)
             (insert organization))
           (goto-char (point-min))
           (while (re-search-forward " *\n *" nil t)
             (replace-match " " t t))
           (buffer-substring (point-min) (point-max))))))

(defun gnus-inews-lines ()
  "Count the number of lines and return numeric string."
  (save-excursion
    (save-restriction
      (widen)
      (goto-char (point-min))
      (re-search-forward 
       (concat "^" (regexp-quote mail-header-separator) "$"))
      (forward-line 1)
      (int-to-string (count-lines (point) (point-max))))))

(defun gnus-inews-in-reply-to ()
  "Return the In-Reply-To header for this message."
  gnus-in-reply-to)

\f
;;;
;;; Gnus Mail Functions 
;;;

;;; Mail reply commands of Gnus summary mode

(defun gnus-summary-reply (yank &optional yank-articles)
  "Reply mail to news author.
If prefix argument YANK is non-nil, original article is yanked automatically.
Customize the variable gnus-mail-reply-method to use another mailer."
  (interactive "P")
  ;; Bug fix by jbw@bigbird.bu.edu (Joe Wells)
  ;; Stripping headers should be specified with mail-yank-ignored-headers.
  (gnus-set-global-variables)
  (if yank-articles (gnus-summary-goto-subject (car yank-articles)))
  (gnus-summary-select-article)
  (bury-buffer gnus-article-buffer)
  (gnus-mail-reply (or yank-articles (not (not yank)))))

(defun gnus-summary-reply-with-original (n)
  "Reply mail to news author with original article.
Customize the variable gnus-mail-reply-method to use another mailer."
  (interactive "P")
  (gnus-summary-reply t (gnus-summary-work-articles n)))

(defun gnus-summary-mail-forward (post)
  "Forward the current message to another user.
Customize the variable gnus-mail-forward-method to use another mailer."
  (interactive "P")
  (gnus-set-global-variables)
  (gnus-summary-select-article)
  (gnus-copy-article-buffer)
  (if post
      (gnus-forward-using-post gnus-original-article-buffer)
    (gnus-mail-forward gnus-original-article-buffer)))

(defun gnus-summary-resend-message (address)
  "Resend the current article to ADDRESS."
  (interactive "sResend message to: ")
  (gnus-summary-select-article)
  (save-excursion
    (let (beg)
      ;; We first set up a normal mail buffer.
      (nnheader-set-temp-buffer " *Gnus resend*")
      ;; This code from sendmail.el
      (insert "To: ")
      (let ((fill-prefix "\t")
            (address-start (point)))
        (insert address "\n")
        (fill-region-as-paragraph address-start (point-max)))
      (insert mail-header-separator "\n")
      ;; Insert our usual headers.
      (gnus-inews-narrow-to-headers)
      (gnus-inews-insert-headers '(From Date To))
      (goto-char (point-min))
      ;; Rename them all to "Resent-*".
      (while (re-search-forward "^[A-Za-z]" nil t)
        (forward-char -1)
        (insert "Resent-"))
      (widen)
      (forward-line)
      (delete-region (point) (point-max))
      (setq beg (point))
      ;; Insert the message to be resent.
      (insert-buffer-substring gnus-original-article-buffer)
      (goto-char (point-min))
      (search-forward "\n\n")
      (forward-char -1)
      (save-restriction
        (narrow-to-region beg (point))
        (nnheader-remove-header gnus-ignored-resent-headers t)
        (goto-char (point-max)))
      (insert mail-header-separator)
      ;; Rename all old ("Also-")Resent headers.
      (while (re-search-backward "^\\(Also-\\)?Resent-" beg t)
        (beginning-of-line)
        (insert "Also-"))
      ;; Send it.
      (mail-send)
      (kill-buffer (current-buffer)))))

(defun gnus-summary-post-forward ()
  "Forward the current article to a newsgroup."
  (interactive)
  (gnus-summary-mail-forward t))

(defvar gnus-nastygram-message 
  "The following article was inappropriately posted to %s.\n"
  "Format string to insert in nastygrams.
The current group name will be inserted at \"%s\".")

(defun gnus-summary-mail-nastygram (n)
  "Send a nastygram to the author of the current article."
  (interactive "P")
  (if (or gnus-expert-user
          (gnus-y-or-n-p 
           "Really send a nastygram to the author of the current article? "))
      (let ((group gnus-newsgroup-name))
        (gnus-summary-reply-with-original n)
        (set-buffer gnus-mail-buffer)
        (insert (format gnus-nastygram-message group))
        (gnus-mail-send-and-exit))))

(defun gnus-summary-mail-other-window ()
  "Compose mail in other window.
Customize the variable `gnus-mail-other-window-method' to use another
mailer."
  (interactive)
  (gnus-set-global-variables)
  (gnus-new-mail
   ;; We might want to prompt here.
   (when (and gnus-interactive-post
              (not gnus-expert-user))
     (read-string "To: ")))
  (gnus-configure-windows 'summary-mail 'force))

(defun gnus-new-mail (&optional to)
  (let (subject)
    (when (and gnus-interactive-post
               (not gnus-expert-user))
      (setq subject (read-string "Subject: ")))
    (pop-to-buffer gnus-mail-buffer)
    (erase-buffer)
    (gnus-mail-setup 'new to subject)
    (gnus-inews-insert-gcc)
    (gnus-inews-insert-archive-gcc)
    (run-hooks 'gnus-mail-hook)))

(defun gnus-new-empty-mail ()
  "Create a new, virtually empty mail mode buffer."
  (pop-to-buffer gnus-mail-buffer)
  (gnus-mail-setup 'new "" ""))

(defun gnus-mail-reply (&optional yank to-address followup)
  (save-excursion
    (set-buffer gnus-summary-buffer)
    (let ((group (gnus-group-real-name gnus-newsgroup-name))
          (cur (cons (current-buffer) (cdr gnus-article-current)))
          (winconf (current-window-configuration))
          from subject date reply-to message-of to cc
          references message-id sender follow-to sendto elt new-cc new-to
          mct mctdo gnus-warning)
      (set-buffer (get-buffer-create gnus-mail-buffer))
      (mail-mode)
      (if (and (buffer-modified-p)
               (> (buffer-size) 0)
               (not (gnus-y-or-n-p 
                     "Unsent message being composed; erase it? ")))
          ()
        (erase-buffer)
        (save-excursion
          (gnus-copy-article-buffer)
          (save-restriction
            (set-buffer gnus-article-copy)
            (nnheader-narrow-to-headers)
            (if (not followup)
                ;; This is a regular reply.
                (if (gnus-functionp gnus-reply-to-function)
                    (setq follow-to (funcall gnus-reply-to-function group)))
              ;; This is a followup.
              (if (gnus-functionp gnus-followup-to-function)
                  (save-excursion
                    (setq follow-to
                          (funcall gnus-followup-to-function group)))))
            (setq from (mail-fetch-field "from"))
            (setq date (or (mail-fetch-field "date") 
                           (mail-header-date gnus-current-headers)))
            (setq message-of (gnus-message-of from date))
            (setq sender (mail-fetch-field "sender"))
            (setq subject (or (mail-fetch-field "subject") "none"))
            ;; Remove any (buggy) Re:'s that are present and make a
            ;; proper one.
            (and (string-match "^[ \t]*[Re][Ee]:[ \t]*" subject)
                 (setq subject (substring subject (match-end 0))))
            (setq subject (concat "Re: " subject))
            (setq to (mail-fetch-field "to"))
            (setq cc (mail-fetch-field "cc"))
            (setq mct (mail-fetch-field "mail-copies-to"))
            (setq reply-to
                  (unless (gnus-group-get-parameter group 'broken-reply-to)
                    (mail-fetch-field "reply-to")))
            (setq references (mail-fetch-field "references"))
            (setq message-id (mail-fetch-field "message-id"))
            (when (and (setq gnus-warning (mail-fetch-field "gnus-warning"))
                       (string-match "<[^>]+>" gnus-warning))
              (setq message-id (match-string 0 gnus-warning)))
            
            (setq mctdo (and mct (not (equal mct "never"))))
            (when (and mct (string= (downcase mct) "always"))
              (setq mct (or reply-to from)))

            (if (not (and followup (not to-address)))
                (setq new-to (or reply-to from)
                      new-cc 
                      (if (and mctdo
                               (not (string= 
                                     (gnus-mail-strip-quoted-names mct)
                                     (gnus-mail-strip-quoted-names
                                      (or to-address 
                                          (if (and follow-to 
                                                   (not (stringp follow-to)))
                                              sendto
                                            (or follow-to new-to
                                                sender "")))))))
                          mct))
              (let (ccalist)
                (save-excursion
                  (gnus-set-work-buffer)
                  (unless (equal mct "never")
                    (insert (or reply-to from "")))
                  (insert 
                   (if (bolp) "" ", ") (or to "")
                   (if (or (not mct) (not mctdo)) ""
                     (concat (if (bolp) "" ", ") mct))
                   (if cc (concat (if (bolp) "" ", ") cc) ""))
                  ;; Remove addresses that match `rmail-dont-reply-to-names'. 
                  (insert (prog1 (rmail-dont-reply-to (buffer-string))
                            (erase-buffer)))
                  (goto-char (point-min))
                  (setq ccalist
                        (mapcar
                         (lambda (addr)
                           (cons (gnus-mail-strip-quoted-names addr) addr))
                         (nreverse (gnus-mail-parse-comma-list))))
                  (let ((s ccalist))
                    (while s
                      (setq ccalist (delq (assoc (car (pop s)) s) ccalist)))))
                (setq new-to (cdr (pop ccalist)))
                (setq new-cc 
                      (mapconcat 
                       (lambda (addr) (cdr addr))
                       ccalist ", "))))
            (widen)))

        (setq news-reply-yank-from (or from "(nobody)"))
        (setq news-reply-yank-message-id
              (or message-id "(unknown Message-ID)"))

        ;; Gather the "to" addresses out of the follow-to list and remove
        ;; them as we go.
        (if (and follow-to (listp follow-to))
            (while (setq elt (assoc "To" follow-to))
              (setq sendto (concat sendto (and sendto ", ") (cdr elt)))
              (setq follow-to (delq elt follow-to))))

        (gnus-mail-setup 
         (if followup 'followup 'reply)
         (or to-address 
             (if (and follow-to (not (stringp follow-to))) sendto
               (or follow-to new-to sender "")))
         subject message-of
         (if (zerop (length new-cc)) nil new-cc)
         gnus-article-copy)

        (make-local-variable 'gnus-article-reply)
        (setq gnus-article-reply cur)
        (make-local-variable 'gnus-prev-winconf)
        (setq gnus-prev-winconf winconf)
        (make-local-variable 'gnus-reply-subject)
        (setq gnus-reply-subject subject)
        (make-local-variable 'gnus-in-reply-to)
        (setq gnus-in-reply-to message-of)

        (auto-save-mode auto-save-default)
        (gnus-inews-insert-gcc)
        (gnus-inews-insert-archive-gcc group)

        (when (and follow-to (listp follow-to))
          (let (beg)
            (gnus-inews-narrow-to-headers)
            (re-search-forward "^To:" nil t)
            (beginning-of-line)
            (forward-line 1)
            (setq beg (point))
            ;; Insert the rest of the Follow-To headers.
            (while follow-to
              (goto-char (point-min))
              (if (not (re-search-forward 
                        (concat "^" (caar follow-to) ": *") nil t))
                  (progn
                    (goto-char beg)
                    (insert (caar follow-to) ": " (cdar follow-to) "\n"))
                (unless (eolp)
                  (insert ", "))
                (insert (cdar follow-to)))
              (setq follow-to (cdr follow-to)))
            (widen)))
        (nnheader-insert-references references message-id)

        ;; Now the headers should be ok, so we do the yanking.
        (goto-char (point-min))
        (re-search-forward
         (concat "^" (regexp-quote mail-header-separator) "$"))
        (forward-line 1)
        (if (not yank)
            (gnus-configure-windows 'reply 'force)
          (let ((last (point))
                end)
            (if (not (listp yank))
                (progn
                  ;; Just a single article being yanked.
                  (save-excursion
                    (mail-yank-original nil))
                  (or mail-yank-hooks mail-citation-hook
                      (run-hooks 'news-reply-header-hook)))
              (while yank
                (save-window-excursion
                  (set-buffer gnus-summary-buffer)
                  (gnus-summary-select-article nil nil nil (car yank))
                  (gnus-summary-remove-process-mark (car yank)))
                (save-excursion
                  (setq end (point))
                  (gnus-copy-article-buffer)
                  (mail-yank-original nil)
                  (save-restriction
                    (narrow-to-region (point-min) (point))
                    (goto-char (mark t))
                    (let ((news-reply-yank-from
                           (save-excursion 
                             (set-buffer gnus-article-buffer)
                             (or (mail-fetch-field "from") "(nobody)")))
                          (news-reply-yank-message-id
                           (save-excursion 
                             (set-buffer gnus-article-buffer)
                             (or (mail-fetch-field "message-id")
                                 "(unknown Message-ID)"))))
                      (or mail-yank-hooks mail-citation-hook
                          (run-hooks 'news-reply-header-hook))
                      (setq end (point-max)))))
                (goto-char end)
                (setq yank (cdr yank))))
            (goto-char last))
          (forward-line 2)
          (gnus-configure-windows 'reply-yank 'force))
        (run-hooks 'gnus-mail-hook)
        ;; Mark this buffer as unchanged.
        (set-buffer-modified-p nil)))))

(defun gnus-mail-parse-comma-list ()
  (let (accumulated
        beg)
    (skip-chars-forward " ")
    (while (not (eobp))
      (setq beg (point))
      (skip-chars-forward "^,")
      (while (zerop
              (save-excursion 
                (save-restriction
                  (let ((i 0))
                    (narrow-to-region beg (point))
                    (goto-char beg)
                    (logand (progn
                              (while (search-forward "\"" nil t)
                                (incf i))
                              (if (zerop i) 2 i)) 2)))))
        (skip-chars-forward ",")
        (skip-chars-forward "^,"))
      (skip-chars-backward " ")
      (setq accumulated
            (cons (buffer-substring beg (point))
                  accumulated))
      (skip-chars-forward "^,")
      (skip-chars-forward ", "))
    accumulated))

(defun gnus-new-news (&optional group inhibit-prompt)
  "Set up a *Post Gnus* buffer that points to GROUP.
If INHIBIT-PROMPT, never prompt for a Subject."
  (let ((winconf (current-window-configuration))
        subject)
    (when (and gnus-interactive-post
               (not inhibit-prompt)
               (not gnus-expert-user))
      (setq subject (read-string "Subject: ")))
    (pop-to-buffer gnus-post-news-buffer)  
    (erase-buffer)
    (news-reply-mode)
    ;; Let posting styles be configured.
    (gnus-configure-posting-styles)
    (news-setup nil subject nil (and group (gnus-group-real-name group)) nil)
    ;; Associate this buffer with the draft group.
    (gnus-enter-buffer-into-draft)
    (goto-char (point-min))

    (unless (re-search-forward 
             (concat "^" (regexp-quote mail-header-separator) "$") nil t)
      (goto-char (point-max)))
    (insert "\n\n")

    (gnus-inews-insert-bfcc)
    (gnus-inews-insert-gcc)
    (gnus-inews-insert-archive-gcc group)
    (gnus-inews-insert-signature)
    (and gnus-post-prepare-function
         (gnus-functionp gnus-post-prepare-function)
         (funcall gnus-post-prepare-function group))
    (run-hooks 'gnus-post-prepare-hook)
    (gnus-inews-set-point)
    (make-local-variable 'gnus-prev-winconf)
    (setq gnus-prev-winconf winconf)
    (gnus-inews-modify-mail-mode-map)
    (local-set-key "\C-c\C-c" 'gnus-inews-news)))

(defun gnus-news-followup (&optional yank group)
  (save-excursion
    (set-buffer gnus-summary-buffer)
    (if (not (or (not gnus-novice-user)
                 gnus-expert-user
                 (gnus-y-or-n-p
                  "Are you sure you want to post to all of USENET? ")))
        ()
      (let ((group (gnus-group-real-name (or group gnus-newsgroup-name)))
            (cur (cons (current-buffer) (cdr gnus-article-current)))
            (winconf (current-window-configuration))
            from subject date message-of
            references message-id follow-to sendto elt 
            followup-to distribution newsgroups gnus-warning)
        (set-buffer (get-buffer-create gnus-post-news-buffer))
        (news-reply-mode)
        ;; Associate this buffer with the draft group.
        (gnus-enter-buffer-into-draft)
        (if (and (buffer-modified-p)
                 (> (buffer-size) 0)
                 (not (gnus-y-or-n-p 
                       "Unsent message being composed; erase it? ")))
            ()
          (erase-buffer)
          (save-excursion
            (gnus-copy-article-buffer)
            (save-restriction
              (set-buffer gnus-article-copy)
              (nnheader-narrow-to-headers)
              (if (gnus-functionp gnus-followup-to-function)
                  (save-excursion
                    (setq follow-to
                          (funcall gnus-followup-to-function group))))
              (setq from (mail-fetch-field "from"))
              (setq date (or (mail-fetch-field "date") 
                             (mail-header-date gnus-current-headers)))
              (setq message-of (gnus-message-of from date))
              (setq subject (or (mail-fetch-field "subject") "none"))
              ;; Remove any (buggy) Re:'s that are present and make a
              ;; proper one.
              (and (string-match "^[ \t]*[Re][Ee]:[ \t]*" subject)
                   (setq subject (substring subject (match-end 0))))
              (setq subject (concat "Re: " subject))
              (setq references (mail-fetch-field "references"))
              (setq message-id (mail-fetch-field "message-id"))
              (when (and (setq gnus-warning (mail-fetch-field "gnus-warning"))
                         (string-match "<[^>]+>" gnus-warning))
                (setq message-id (match-string 0 gnus-warning)))
              (setq followup-to (mail-fetch-field "followup-to"))
              (setq newsgroups (mail-fetch-field "newsgroups"))
              (setq distribution (mail-fetch-field "distribution"))
              ;; Remove bogus distribution.
              (and (stringp distribution)
                   (string-match "world" distribution)
                   (setq distribution nil))
              (widen)))

          (setq news-reply-yank-from (or from "(nobody)"))
          (setq news-reply-yank-message-id
                (or message-id "(unknown Message-ID)"))

          ;; Gather the "to" addresses out of the follow-to list and remove
          ;; them as we go.
          (if (and follow-to (listp follow-to))
              (while (setq elt (assoc "Newsgroups" follow-to))
                (setq sendto (concat sendto (and sendto ", ") (cdr elt)))
                (setq follow-to (delq elt follow-to))))

          ;; Let posting styles be configured.
          (gnus-configure-posting-styles)

          (news-setup
           nil subject nil 
           (or sendto 
               (if (equal followup-to "poster")
                   (or newsgroups group "")
                 (and followup-to
                      gnus-use-followup-to
                      (or (not (eq gnus-use-followup-to 'ask))
                          (equal followup-to newsgroups)
                          (gnus-y-or-n-p 
                           (format "Use Followup-To %s? " followup-to)))
                      followup-to))
               newsgroups group "")
           gnus-article-copy)

          (make-local-variable 'gnus-article-reply)
          (setq gnus-article-reply cur)
          (make-local-variable 'gnus-prev-winconf)
          (setq gnus-prev-winconf winconf)
          (make-local-variable 'gnus-reply-subject)
          (setq gnus-reply-subject (mail-header-subject gnus-current-headers))
          (make-local-variable 'gnus-in-reply-to)
          (setq gnus-in-reply-to message-of)
          (when (and followup-to newsgroups)
            (make-local-variable 'gnus-newsgroup-followup)
            (setq gnus-newsgroup-followup
                  (cons newsgroups followup-to)))

          (gnus-inews-insert-signature)

          (and gnus-post-prepare-function
               (gnus-functionp gnus-post-prepare-function)
               (funcall gnus-post-prepare-function group))
          (run-hooks 'gnus-post-prepare-hook)

          (auto-save-mode auto-save-default)
          (gnus-inews-modify-mail-mode-map)
          (local-set-key "\C-c\C-c" 'gnus-inews-news)

          (if (and follow-to (listp follow-to))
              (progn
                (goto-char (point-min))
                (and (re-search-forward "^Newsgroups:" nil t)
                     (forward-line 1))
                (while follow-to
                  (insert (caar follow-to) ": " (cdar follow-to) "\n")
                  (setq follow-to (cdr follow-to)))))
          
          ;; If a distribution existed, we use it.
          (if distribution
              (progn
                (mail-position-on-field "Distribution")
                (insert distribution)))
          
          (nnheader-insert-references references message-id)

          ;; Handle `gnus-auto-mail-to-author'.
          ;; Suggested by Daniel Quinlan <quinlan@best.com>.
          ;; Revised to respect Reply-To by Ulrik Dickow <dickow@nbi.dk>.
          (let ((to (if (if (eq gnus-auto-mail-to-author 'ask)
                            (y-or-n-p "Also send mail to author? ")
                          gnus-auto-mail-to-author)
                        (or (save-excursion
                              (set-buffer gnus-article-copy)
                              (unless (gnus-group-get-parameter
                                       group 'broken-reply-to)
                                (gnus-fetch-field "reply-to")))
                            from)))
                (x-mail (save-excursion
                          (set-buffer gnus-article-copy)
                          (gnus-fetch-field "x-mail-copy-to"))))
            ;; Deny sending copy if there's a negative X-Mail-Copy-To
            ;; header. 
            (if x-mail
                (if (and (string= x-mail "never")
                         (not (eq gnus-auto-mail-to-author 'force)))
                    (setq to nil)
                  (setq to x-mail)))
            ;; Insert a To or Cc header.
            (if to
                (if (mail-fetch-field "To")
                    (progn
                      (beginning-of-line)
                      (insert "Cc: " to "\n"))
                  (mail-position-on-field "To")
                  (insert to))))

          (gnus-inews-insert-bfcc)
          (gnus-inews-insert-gcc)
          (gnus-inews-insert-archive-gcc group)

          ;; Now the headers should be ok, so we do the yanking.
          (goto-char (point-min))
          (re-search-forward
           (concat "^" (regexp-quote mail-header-separator) "$"))
          (forward-line 1)
          (if (not yank)
              (progn
                (gnus-configure-windows 'followup 'force)
                (insert "\n\n")
                (forward-line -2))
            (let ((last (point))
                  end)
              (if (not (listp yank))
                  (progn
                    (save-excursion
                      (mail-yank-original nil))
                    (or mail-yank-hooks mail-citation-hook
                        (run-hooks 'news-reply-header-hook)))
                (while yank
                  (save-window-excursion
                    (set-buffer gnus-summary-buffer)
                    (gnus-summary-select-article nil nil nil (car yank))
                    (gnus-summary-remove-process-mark (car yank)))
                  (save-excursion
                    (gnus-copy-article-buffer)
                    (mail-yank-original nil)
                    (setq end (set-marker (make-marker) (point))))
                  (or mail-yank-hooks mail-citation-hook
                      (run-hooks 'news-reply-header-hook))
                  (goto-char end)
                  (set-marker end nil)
                  (setq yank (cdr yank))))
              (goto-char last))
            (gnus-configure-windows 'followup-yank 'force))
        
          (make-local-variable 'gnus-article-check-size)
          (setq gnus-article-check-size
                (cons (buffer-size) (gnus-article-checksum)))
          (gnus-inews-set-point))))))

(defun gnus-message-of (from date)
  "Take a FROM and a DATE and return an IN-REPLY-TO."
  (when from
    (let ((stop-pos 
           (string-match "  *at \\|  *@ \\| *(\\| *<" from)))
      (concat (if stop-pos (substring from 0 stop-pos) from)
              "'s message of " 
              (if (or (not date) (string= date ""))
                  "(unknown date)" date)))))

(defun gnus-mail-yank-original ()
  (interactive)
  (save-excursion
    (mail-yank-original nil))
  (or mail-yank-hooks mail-citation-hook
      (run-hooks 'news-reply-header-hook)))

(defun gnus-mail-send-and-exit (&optional dont-send)
  "Send the current mail and return to Gnus."
  (interactive)
  (let* ((reply gnus-article-reply)
         (winconf gnus-prev-winconf)
         (address-group gnus-add-to-address)
         (to-address (and address-group
                          (mail-fetch-field "to"))))
    (setq gnus-add-to-address nil)
    (let ((buffer-file-name nil))
      (or dont-send (gnus-mail-send)))
    (bury-buffer)
    (when (gnus-alive-p)
      ;; This mail group doesn't have a `to-list', so we add one
      ;; here.  Magic!  
      (when to-address
        (gnus-group-add-parameter address-group (cons 'to-list to-address)))
      (when (and (gnus-buffer-exists-p (car reply))
                 (cdr reply))
        (save-excursion
          (set-buffer (car reply))
          (gnus-summary-mark-article-as-replied (cdr reply))))
      (and winconf (set-window-configuration winconf)))))

(defun gnus-kill-message-buffer ()
  "Kill the current buffer after dissociating it from the draft group."
  (interactive)
  (when (gnus-y-or-n-p "Dissociate and kill the current buffer? ")
    (gnus-dissociate-buffer-from-draft)
    (let ((winconf gnus-prev-winconf))
      (kill-buffer (current-buffer))
      (when winconf 
        (set-window-configuration winconf)))))

(defun gnus-put-message ()
  "Put the current message in some group and return to Gnus."
  (interactive)
  (let ((reply gnus-article-reply)
        (winconf gnus-prev-winconf)
        (group gnus-newsgroup-name))
    
    (or (and group (not (gnus-group-read-only-p group)))
        (setq group (read-string "Put in group: " nil
                                 (gnus-writable-groups))))
    (and (gnus-gethash group gnus-newsrc-hashtb)
         (error "No such group: %s" group))

    (save-excursion
      (save-restriction
        (widen)
        (gnus-inews-narrow-to-headers)
        (let (gnus-deletable-headers)
          (if (eq major-mode 'mail-mode)
              (gnus-inews-insert-headers gnus-required-mail-headers)
            (gnus-inews-insert-headers)))
        (goto-char (point-max))
        (insert "Gcc: " group "\n")
        (widen)))

    (gnus-inews-do-gcc)

    (if (get-buffer gnus-group-buffer)
        (progn
          (if (gnus-buffer-exists-p (car-safe reply))
              (progn
                (set-buffer (car reply))
                (and (cdr reply)
                     (gnus-summary-mark-article-as-replied 
                      (cdr reply)))))
          (and winconf (set-window-configuration winconf))))))

(defun gnus-forward-make-subject (buffer)
  (save-excursion
    (set-buffer buffer)
    (concat "[" (if (memq 'mail (assoc (symbol-name 
                                        (car (gnus-find-method-for-group 
                                              gnus-newsgroup-name)))
                                       gnus-valid-select-methods))
                    (gnus-fetch-field "From")
                  gnus-newsgroup-name)
            "] " (or (gnus-fetch-field "Subject") ""))))

(defun gnus-forward-insert-buffer (buffer)
  (save-excursion
    (save-restriction
      ;; Put point where we want it before inserting the forwarded
      ;; message. 
      (if gnus-signature-before-forwarded-message
          (goto-char (point-max))
        (goto-char (point-min))
        (re-search-forward
         (concat "^" (regexp-quote mail-header-separator) "$"))
        (forward-line 1))
      ;; Narrow to the area we are to insert.
      (narrow-to-region (point) (point))
      ;; Insert the separators and the forwarded buffer.
      (insert gnus-forward-start-separator)
      (insert-buffer-substring buffer)
      (goto-char (point-max))
      (insert gnus-forward-end-separator)
      (gnus-set-text-properties (point-min) (point-max) nil)
      ;; Remove all unwanted headers.
      (goto-char (point-min))
      (forward-line 1)
      (save-restriction
        (narrow-to-region (point) (if (search-forward "\n\n" nil t)
                                      (1- (point))
                                    (point)))
        (goto-char (point-min))
        (let ((case-fold-search t))
          (delete-non-matching-lines gnus-forward-included-headers))))))

(defun gnus-mail-forward (&optional buffer)
  "Forward the current message to another user using mail."
  (let* ((forward-buffer (or buffer (current-buffer)))
         (winconf (current-window-configuration))
         (subject (gnus-forward-make-subject forward-buffer)))
    (set-buffer (get-buffer-create gnus-mail-buffer))
    (if (and (buffer-modified-p)
             (> (buffer-size) 0)
             (not (gnus-y-or-n-p 
                   "Unsent message being composed; erase it? ")))
        ()
      (erase-buffer)
      (gnus-mail-setup 'forward nil subject)
      (make-local-variable 'gnus-prev-winconf)
      (setq gnus-prev-winconf winconf)
      (gnus-forward-insert-buffer forward-buffer)
      (goto-char (point-min))
      (re-search-forward "^To: ?" nil t)
      (gnus-configure-windows 'mail-forward 'force)
      ;; You have a chance to arrange the message.
      (run-hooks 'gnus-mail-forward-hook)
      (run-hooks 'gnus-mail-hook))))

(defun gnus-forward-using-post (&optional buffer)
  (save-excursion
    (let* ((forward-buffer (or buffer (current-buffer))) 
           (subject (gnus-forward-make-subject forward-buffer))
           (gnus-newsgroup-name nil))
      (gnus-post-news 'post nil nil nil nil subject)
      (save-excursion
        (gnus-forward-insert-buffer forward-buffer)
        ;; You have a chance to arrange the message.
        (run-hooks 'gnus-mail-forward-hook)))))

(defun gnus-mail-other-window-using-mail ()
  "Compose mail other window using mail."
  (let ((winconf (current-window-configuration)))
    (mail-other-window nil nil nil nil nil (get-buffer gnus-article-buffer))
    (gnus-inews-modify-mail-mode-map)
    (make-local-variable 'gnus-prev-winconf)
    (setq gnus-prev-winconf winconf)
    (run-hooks 'gnus-mail-hook)
    (gnus-configure-windows 'summary-mail 'force)))

(defun gnus-article-mail (yank)
  "Send a reply to the address near point.
If YANK is non-nil, include the original article."
  (interactive "P")
  (let ((address 
         (buffer-substring
          (save-excursion (re-search-backward "[ \t\n]" nil t) (1+ (point)))
          (save-excursion (re-search-forward "[ \t\n]" nil t) (1- (point))))))
    (and address
         (progn
           (switch-to-buffer gnus-summary-buffer)
           (gnus-mail-reply yank address)))))

(defun gnus-bug ()
  "Send a bug report to the Gnus maintainers."
  (interactive)
  (let ((winconf (current-window-configuration)))
    (delete-other-windows)
    (switch-to-buffer "*Gnus Help Bug*")
    (erase-buffer)
    (insert gnus-bug-message)
    (goto-char (point-min))
    (pop-to-buffer "*Gnus Bug*")
    (erase-buffer)
    (mail-mode)
    (mail-setup gnus-maintainer nil nil nil nil nil)
    (auto-save-mode auto-save-default)
    (make-local-variable 'gnus-prev-winconf)
    (setq gnus-prev-winconf winconf)
    (gnus-inews-modify-mail-mode-map)
    (local-set-key "\C-c\C-c" 'gnus-bug-mail-send-and-exit)
    (goto-char (point-min))
    (re-search-forward (concat "^" (regexp-quote mail-header-separator) "$"))
    (forward-line 1)
    (insert (gnus-version) "\n")
    (insert (emacs-version))
    (insert "\n\n\n\n\n")
    (gnus-debug)
    (goto-char (point-min))
    (search-forward "Subject: " nil t)
    (message "")))

(defun gnus-bug-mail-send-and-exit ()
  "Send the bug message and exit."
  (interactive)
  (let ((cur (current-buffer)))
    (and (get-buffer "*Gnus Help Bug*")
         (kill-buffer "*Gnus Help Bug*"))
    (gnus-mail-send-and-exit)
    (when (buffer-name cur)
      (kill-buffer cur))))

(defun gnus-debug ()
  "Attemps to go through the Gnus source file and report what variables have been changed.
The source file has to be in the Emacs load path."
  (interactive)
  (let ((files '("gnus.el" "gnus-msg.el" "gnus-score.el" "nnmail.el"))
        file dirs expr olist sym)
    (message "Please wait while we snoop your variables...")
    (sit-for 0)
    (save-excursion
      (set-buffer (get-buffer-create " *gnus bug info*"))
      (buffer-disable-undo (current-buffer))
      (while files
        (erase-buffer)
        (setq dirs load-path)
        (while dirs
          (if (or (not (car dirs))
                  (not (stringp (car dirs)))
                  (not (file-exists-p 
                        (setq file (concat (file-name-as-directory 
                                            (car dirs)) (car files))))))
              (setq dirs (cdr dirs))
            (setq dirs nil)
            (insert-file-contents file)
            (goto-char (point-min))
            (if (not (re-search-forward "^;;* *Internal variables" nil t))
                (message "Malformed sources in file %s" file)
              (narrow-to-region (point-min) (point))
              (goto-char (point-min))
              (while (setq expr (condition-case () 
                                    (read (current-buffer)) (error nil)))
                (condition-case ()
                    (and (eq (car expr) 'defvar)
                         (stringp (nth 3 expr))
                         (or (not (boundp (nth 1 expr)))
                             (not (equal (eval (nth 2 expr))
                                         (symbol-value (nth 1 expr)))))
                         (setq olist (cons (nth 1 expr) olist)))
                  (error nil))))))
        (setq files (cdr files)))
      (kill-buffer (current-buffer)))
    (when (setq olist (nreverse olist))
      (insert "------------------ Environment follows ------------------\n\n"))
    (while olist
      (if (boundp (car olist))
          (condition-case ()
              (pp `(setq ,(car olist)
                         ,(if (or (consp (setq sym (symbol-value (car olist))))
                                  (and (symbolp sym)
                                       (not (or (eq sym nil)
                                                (eq sym t)))))
                              (list 'quote (symbol-value (car olist)))
                            (symbol-value (car olist))))
                  (current-buffer))
            (error
             (format "(setq %s 'whatever)\n" (car olist))))
        (insert ";; (makeunbound '" (symbol-name (car olist)) ")\n"))
      (setq olist (cdr olist)))
    (insert "\n\n")
    ;; Remove any null chars - they seem to cause trouble for some
    ;; mailers. (Byte-compiled output from the stuff above.) 
    (goto-char (point-min))
    (while (re-search-forward "[\000\200]" nil t)
      (replace-match "" t t))))

;;; Treatment of rejected articles.
;;; Bounced mail.

(defvar mail-unsent-separator)

(defun gnus-summary-resend-bounced-mail (fetch)
  "Re-mail the current message.
This only makes sense if the current message is a bounce message than
contains some mail you have written which has been bounced back to
you.
If FETCH, try to fetch the article that this is a reply to, if indeed
this is a reply."
  (interactive "P")
  (require 'rmail)
  (gnus-summary-select-article t)
  ;; Create a mail buffer.
  (gnus-new-empty-mail)
  (erase-buffer)
  (insert-buffer-substring gnus-article-buffer)
  (goto-char (point-min))
  (or (re-search-forward mail-unsent-separator nil t)
      (and (search-forward "\n\n" nil t)
           (re-search-forward "^Return-Path:.*\n" nil t)))
  ;; We remove everything before the bounced mail.
  (delete-region 
   (point-min)
   (if (re-search-forward "[^ \t]*:" nil t)
       (match-beginning 0)
     (point)))
  (let (references)
    (save-excursion
      (save-restriction
        (nnheader-narrow-to-headers)
        (nnheader-remove-header gnus-bounced-headers-junk t)
        (setq references (mail-fetch-field "references"))
        (goto-char (point-max))
        (insert mail-header-separator)))
    ;; If there are references, we fetch the article we answered to.  
    (and fetch 
         references
         (string-match "\\(<[^]+>\\)[ \t]*$" references)
         (gnus-summary-refer-article 
          (substring references (match-beginning 1) (match-end 1)))
         (progn
           (gnus-summary-show-all-headers)
           (gnus-configure-windows 'compose-bounce))))
  (goto-char (point-min)))

;;; Sending mail.

(defun gnus-mail-send (&optional no-generated-headers)
  "Send the current buffer as mail.
Headers will be generated before sending."
  (interactive)
  (unless no-generated-headers
    (save-excursion
      (save-restriction
        (widen)
        (gnus-inews-narrow-to-headers)
        (gnus-inews-insert-headers gnus-required-mail-headers)
        (gnus-inews-remove-empty-headers))))
  (widen)
  (when (not (gnus-inews-reject-message))
    ;; Remove the header separator.
    (goto-char (point-min))
    (and (re-search-forward
          (concat "^" (regexp-quote mail-header-separator) "$") nil t)
         (replace-match "" t t))
    ;; Run final inews hooks.  This hook may do FCC.
    (run-hooks 'gnus-inews-article-hook)
    (gnus-inews-do-gcc)
    (nnheader-narrow-to-headers)
    (nnheader-remove-header "^[gf]cc:" t)
    (widen)
    (goto-char (point-min))
    (search-forward "\n\n")
    (forward-char -1)
    (insert mail-header-separator)
    (mail-send)
    (run-hooks 'gnus-message-sent-hook)))

(defun gnus-inews-modify-mail-mode-map ()
  (use-local-map (copy-keymap (current-local-map)))
  (gnus-local-set-keys
   "\C-c\C-c" gnus-mail-send-and-exit
   "\C-c\M-\C-p" gnus-put-message
   "\C-c\C-q" gnus-kill-message-buffer
   "\C-c\M-d" gnus-dissociate-buffer-from-draft
   "\C-c\C-d" gnus-associate-buffer-with-draft))

(defun gnus-mail-setup (type &optional to subject in-reply-to cc
                             replybuffer actions)
  ;; Let posting styles be configured.
  (gnus-configure-posting-styles)
  (funcall
   (cond
    ((or 
      (eq gnus-mail-method 'mh)
      (and (or (eq type 'reply) (eq type 'followup))
           (eq gnus-mail-reply-method 'gnus-mail-reply-using-mhe))
      (and (eq type 'forward)
           (eq gnus-mail-forward-method 'gnus-mail-forward-using-mhe))
      (and (eq type 'new) 
           (eq gnus-mail-other-window-method 
               'gnus-mail-other-window-using-mhe)))
     'gnus-mh-mail-setup)
    ((or 
      (eq gnus-mail-method 'vm)
      (and (or (eq type 'reply) (eq type 'followup)) 
           (eq gnus-mail-reply-method 'gnus-mail-reply-using-vm))
      (and (eq type 'forward)
           (eq gnus-mail-forward-method 'gnus-mail-forward-using-vm))
      (and (eq type 'new) 
           (eq gnus-mail-other-window-method 
               'gnus-mail-other-window-using-vm)))
     'gnus-vm-mail-setup)
    ((or
      (eq gnus-mail-method 'sendmail)
      (and (or (eq type 'reply) (eq type 'followup)) 
           (eq gnus-mail-reply-method 'gnus-mail-reply-using-mail))
      (and (eq type 'forward)
           (eq gnus-mail-forward-method 'gnus-mail-forward-using-mail))
      (and (eq type 'new) 
           (eq gnus-mail-other-window-method 
               'gnus-mail-other-window-using-mail)))
     'gnus-sendmail-mail-setup)
    (t
     (cond ((or (eq type 'reply) (eq type 'followup))
            gnus-mail-reply-method)
           ((eq type 'forward)
            gnus-mail-forward-method)
           ((eq type 'new) 
            gnus-mail-other-window-method))))
   to subject in-reply-to cc replybuffer actions)
  ;; Associate this mail buffer with the draft group.
  (gnus-enter-buffer-into-draft))

(defun gnus-sendmail-mail-setup (to subject in-reply-to cc replybuffer actions)
  (mail-mode)
  (mail-setup to subject nil cc replybuffer actions)
  (gnus-inews-set-point)
  (gnus-inews-modify-mail-mode-map))
  
;;; Gcc handling.

;; Do Gcc handling, which copied the message over to some group. 
(defun gnus-inews-do-gcc (&optional gcc)
  (save-excursion
    (save-restriction
      (nnheader-narrow-to-headers)
      (let ((gcc (or gcc (mail-fetch-field "gcc" nil t)))
            (cur (current-buffer))
            groups group method)
        (when gcc
          (nnheader-remove-header "gcc")
          (widen)
          (setq groups (gnus-tokenize-header gcc " ,"))
          ;; Copy the article over to some group(s).
          (while (setq group (pop groups))
            (gnus-check-server 
             (setq method
                   (cond ((and (null (gnus-get-info group))
                               (eq (car gnus-message-archive-method)
                                   (car 
                                    (gnus-server-to-method
                                     (gnus-group-method group)))))
                          ;; If the group doesn't exist, we assume
                          ;; it's an archive group...
                          gnus-message-archive-method)
                         (t (gnus-group-method group)))))
            (unless (gnus-request-group group t method)
              (gnus-request-create-group group method))
            (gnus-check-server method)
            (save-excursion
              (nnheader-set-temp-buffer " *acc*")
              (insert-buffer-substring cur)
              (unless (condition-case ()
                          (gnus-request-accept-article group t method)
                        (error nil))
                (gnus-message 1 "Couldn't store article in group %s: %s" 
                              group (gnus-status-message method))
                (sit-for 2))
              (kill-buffer (current-buffer)))))))))

(defun gnus-inews-insert-bfcc ()
  "Insert Bcc and Fcc headers."
  (save-excursion
    ;; Handle author copy using BCC field.
    (when (and gnus-mail-self-blind
               (not (mail-fetch-field "bcc")))
      (mail-position-on-field "Bcc")
      (insert (if (stringp gnus-mail-self-blind)
                  gnus-mail-self-blind
                (user-login-name))))
    ;; Handle author copy using FCC field.
    (when gnus-author-copy
      (mail-position-on-field "Fcc")
      (insert gnus-author-copy))))

(defun gnus-inews-insert-gcc ()
  "Insert Gcc headers based on `gnus-outgoing-message-group'."
  (save-excursion
    (save-restriction
      (gnus-inews-narrow-to-headers)
      (let* ((group gnus-outgoing-message-group)
             (gcc (cond 
                   ((gnus-functionp group)
                    (funcall group))
                   ((or (stringp group) (list group))
                    group))))
        (when gcc
          (insert "Gcc: "
                  (if (stringp gcc) gcc
                    (mapconcat 'identity gcc " "))
                  "\n"))))))

(defun gnus-inews-insert-archive-gcc (&optional group)
  "Insert the Gcc to say where the article is to be archived."
  (let* ((var gnus-message-archive-group)
         (group (or group gnus-newsgroup-name ""))
         result
         (groups
          (cond 
           ((null gnus-message-archive-method)
            ;; Ignore.
            nil)
           ((stringp var)
            ;; Just a single group.
            (list var))
           ((null var)
            ;; We don't want this.
            nil)
           ((and (listp var) (stringp (car var)))
            ;; A list of groups.
            var)
           ((gnus-functionp var)
            ;; A function.
            (funcall var group))
           (t
            ;; An alist of regexps/functions/forms.
            (while (and var
                        (not
                         (setq result
                               (cond 
                                ((stringp (caar var))
                                 ;; Regexp.
                                 (when (string-match (caar var) group)
                                   (cdar var)))
                                ((gnus-functionp (car var))
                                 ;; Function.
                                 (funcall (car var) group))
                                (t
                                 (eval (car var)))))))
              (setq var (cdr var)))
            result))))
    (when groups
      (when (stringp groups)
        (setq groups (list groups)))
      (save-excursion
        (save-restriction
          (gnus-inews-narrow-to-headers)
          (goto-char (point-max))
          (insert "Gcc: ")
          (while groups
            (insert (gnus-group-prefixed-name 
                     (pop groups) gnus-message-archive-method))
            (insert " "))
          (insert "\n"))))))

;;; Handling rejected (and postponed) news.

(defun gnus-draft-group ()
  "Return the name of the draft group."
  (gnus-group-prefixed-name 
   (file-name-nondirectory (directory-file-name gnus-draft-group-directory))
   (list 'nndraft gnus-draft-group-directory)))

(defun gnus-make-draft-group ()
  "Make the draft group or die trying."
  (let* ((method `(nndraft "private" 
                           (nndraft-directory 
                            ,gnus-draft-group-directory)))
         (group (gnus-draft-group)))
    (or (gnus-gethash group gnus-newsrc-hashtb)
        (gnus-group-make-group (gnus-group-real-name group) method)
        (error "Can't create the draft group"))
    (gnus-check-server method)
    group))

(defun gnus-associate-buffer-with-draft (&optional generate silent)
  "Enter the current buffer into the draft group."
  (interactive)
  (when (gnus-request-accept-article (gnus-make-draft-group) t)
    (unless silent
      ;; This function does the proper marking of articles.
      (gnus-mail-send-and-exit 'dont-send))
    (set-buffer-modified-p nil)))

(defun gnus-enter-buffer-into-draft ()
  (when gnus-use-draft
    (save-excursion
      ;; Make sure the draft group exists.
      (gnus-make-draft-group)
      ;; Associate the buffer with the draft group.
      (let ((article (gnus-request-associate-buffer (gnus-draft-group))))
        ;; Arrange for deletion of the draft after successful sending.
        (make-local-variable 'gnus-message-sent-hook)
        (setq gnus-message-sent-hook
              (list
               `(lambda ()
                  (let ((gnus-verbose-backends nil))
                    (gnus-request-expire-articles 
                     (quote ,(list article))
                     ,(gnus-draft-group) t)))))))))

(defun gnus-dissociate-buffer-from-draft ()
  "Disable auto-saving and association to the draft group of the current buffer."
  (interactive)
  (run-hooks 'gnus-message-sent-hook)
  (setq buffer-file-name nil)
  (setq buffer-auto-save-file-name nil))

(defun gnus-summary-send-draft ()
  "Enter a mail/post buffer to edit and send the draft."
  (interactive)
  (gnus-set-global-variables)
  (unless (equal gnus-newsgroup-name (gnus-draft-group))
    (error "This function can only be used in the draft buffer"))
  (let (buf)
    (if (not (setq buf (gnus-request-restore-buffer 
                        (gnus-summary-article-number) gnus-newsgroup-name)))
        (error "Couldn't restore the article")
      (switch-to-buffer buf)
      (gnus-inews-modify-mail-mode-map)
      (when (eq major-mode 'news-reply-mode)
        (local-set-key "\C-c\C-c" 'gnus-inews-news))
      (gnus-enter-buffer-into-draft) 
      ;; Insert the separator.
      (goto-char (point-min))
      (search-forward "\n\n")
      (forward-char -1)
      (insert mail-header-separator)
      ;; Configure windows.
      (let ((gnus-draft-buffer (current-buffer)))
        (gnus-configure-windows 'draft t)
        (goto-char (point))))))
  
(defun gnus-configure-posting-styles ()
  "Configure posting styles according to `gnus-posting-styles'."
  (let ((styles gnus-posting-styles)
        (gnus-newsgroup-name (or gnus-newsgroup-name ""))
        style match variable attribute value value-value)
    ;; Go through all styles and look for matches.
    (while styles
      (setq style (pop styles)
            match (pop style))
      (when (cond ((stringp match)
                   ;; Regexp string match on the group name.
                   (string-match match gnus-newsgroup-name))
                  ((or (symbolp match)
                       (gnus-functionp match))
                   (cond ((gnus-functionp match)
                          ;; Function to be called.
                          (funcall match))
                         ((boundp match)
                          ;; Variable to be checked.
                          (symbol-value match))))
                  ((listp match)
                   ;; This is a form to be evaled.
                   (eval match)))
        ;; We have a match, so we set the variables.
        (while style
          (setq attribute (pop style)
                value (cdr attribute))
          ;; We find the variable that is to be modified.
          (if (and (not (stringp (car attribute)))
                   (not (setq variable (cdr (assq (car attribute) 
                                                  gnus-posting-style-alist)))))
              (message "Couldn't find attribute %s" (car attribute))
            ;; We set the variable.
            (setq value-value
                  (cond ((stringp value)
                         value)
                        ((or (symbolp value)
                             (gnus-functionp value))
                         (cond ((gnus-functionp value)
                                (funcall value))
                               ((boundp value)
                                (symbol-value value))))
                        ((listp value)
                         (eval value))))
            (if variable
                (progn
                  ;; This is an ordinary variable.
                  (make-local-variable variable)
                  (set variable value-value))
              ;; This is a header to be added to the headers when
              ;; posting. 
              (when value-value
                (make-local-variable gnus-required-headers)
                (make-local-variable gnus-required-mail-headers)
                (push (cons (car attribute) value-value) 
                      gnus-required-headers)
                (push (cons (car attribute) value-value) 
                      gnus-required-mail-headers)))))))))

(defun gnus-inews-set-point ()
  "Move point to where the user probably wants to find it."
  (gnus-inews-narrow-to-headers)
  (cond 
   ((re-search-forward "^[^:]+:[ \t]*$" nil t)
    (search-backward ":" )
    (widen)
    (forward-char 2))
   (t
    (goto-char (point-max))
    (widen)
    (forward-line 1)
    (unless (looking-at "$")
      (forward-line 2)))
   (sit-for 0)))

(gnus-add-shutdown 'gnus-inews-close 'gnus)

(defun gnus-inews-close ()
  (setq gnus-inews-sent-ids nil))
  
;;; Allow redefinition of functions.

(gnus-ems-redefine)

(provide 'gnus-msg)

;;; gnus-msg.el ends here