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[gnus] / lisp / gnus-msg.el

;;; gnus-msg.el --- mail and post interface for Gnus
;; Copyright (C) 1995 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, 675 Mass Ave, Cambridge, MA 02139, USA.

;;; Commentary:

;;; Code:

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

(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 t
  "*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 before posting.
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-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-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)))

(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-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 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 Bcc Xref)
  "*Headers to be removed unconditionally before posting.")

(defvar gnus-check-before-posting 
  '(subject-cmsg multiple-headers sendsys message-id from
                 long-lines control-chars size new-text
                 signature approved sender)
  "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-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-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-news*")
(defvar gnus-mail-buffer "*mail*")
(defvar gnus-summary-send-map nil)
(defvar gnus-article-copy nil)
(defvar gnus-reply-subject nil)
(defvar gnus-add-to-address nil)
(defvar gnus-in-reply-to nil)

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

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

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

;;; 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: "))))

(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)))
        subject)
    ;; 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 group 0)))))
    (gnus-post-news 'post group nil gnus-article-buffer)))

(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. 
        (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)))
    (while articles
      (gnus-summary-select-article t nil nil (car articles))
      (and (gnus-eval-in-buffer-window gnus-article-buffer (gnus-cancel-news))
           (gnus-summary-mark-as-read (car articles) gnus-canceled-mark))
      (gnus-summary-remove-process-mark (car articles))
      (gnus-article-hide-headers-if-wanted)
      (setq articles (cdr articles)))))

(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 (mail-strip-quoted-names 
                      (mail-header-from gnus-current-headers)))
           (downcase (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)
  (gnus-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))
          (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 
          (when group
            (gnus-group-get-parameter group 'to-address)))
         (to-group
          (when group
            (gnus-group-get-parameter group 'to-group)))
         (mailing-list
          (and group gnus-mailing-list-groups
               (string-match gnus-mailing-list-groups group))))
    (when group
      (setq group (gnus-group-real-name group)))
    (if (or to-group
            (and (gnus-member-of-valid 'post (or pgroup gnus-newsgroup-name))
                 (not mailing-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 to-address)
            ;; Arrange for mail groups that have no `to-address' to
            ;; get that when the user sends off the mail.
            (or to-address
                (progn
                  (make-local-variable 'gnus-add-to-address)
                  (setq gnus-add-to-address group))))
        (gnus-mail-reply yank to-address 'followup)))))

(defun gnus-inews-news (&optional use-group-method)
  "Send a news message.
If given a prefix, and the group is a foreign group, this function
will attempt to use the foreign server to post the article."
  (interactive "P")
  (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")
             (if (gnus-buffer-exists-p (car-safe reply))
                 (progn
                   (save-excursion
                     (set-buffer gnus-summary-buffer)
                     (gnus-summary-mark-article-as-replied 
                      (cdr reply)))))
             (set-buffer-modified-p nil))
            (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))))))

    (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))))

(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))
         fcc)
    (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)
          (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))
        (gnus-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
        (goto-char (point-min))
        (narrow-to-region 
         (point) 
         (progn
           (re-search-forward 
            (concat "^" (regexp-quote mail-header-separator) "$"))
           (match-beginning 0)))
        (goto-char (point-min))
        (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 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 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
               (format
                "You have lines longer than 79 characters.  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)
     (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)))))))

(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-member-of-valid 'post 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 (mail-strip-quoted-names from))
                (downcase (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-real-user-address) "\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))))))))

\f
;;; Lowlevel inews interface.

;; 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 (and gnus-article-check-size
             (not (gnus-inews-check-post)))
        ;; Aber nein!
        'illegal
      ;; We fudge a hook for nnspool.
      (setq nnspool-rejected-article-hook
            (`
             (list
              (lambda ()
                (condition-case ()
                    (save-excursion
                      (set-buffer (, (buffer-name)))
                      (gnus-put-in-draft-group 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)
        ;; 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)
        ;; Remove X- prefixes to headers.
        (gnus-inews-dex-headers)
        ;; Copy the article over to some group, possibly.
        (and gcc (gnus-inews-do-gcc gcc))
        ;; Post the article.
        (let ((method (gnus-post-method gnus-newsgroup-name use-group-method)))
          (setq result (gnus-request-post 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-put-in-draft-group))
      result)))

(defun gnus-inews-cleanup-headers ()
  ;; Correct newsgroups field: change sequence of spaces to comma and 
  ;; eliminate spaces around commas.  Eliminate imbedded line breaks.
  (goto-char (point-min))
  (if (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 a trailing comma.
        (if (re-search-forward ",$" nil t)
            (replace-match "" t t))))

  ;; Added by Per Abrahamsen <abraham@iesd.auc.dk>.
  ;; Help save the the world!
  (or 
   gnus-expert-user
   (let ((newsgroups (mail-fetch-field "newsgroups"))
         (followup-to (mail-fetch-field "followup-to"))
         groups to)
     (if (and newsgroups
              (string-match "," newsgroups) (not followup-to))
         (progn
           (while (string-match "," newsgroups)
             (setq groups
                   (cons (list (substring newsgroups 0 (match-beginning 0)))
                         groups))
             (setq newsgroups (substring newsgroups (match-end 0))))
           (setq groups (nreverse (cons (list newsgroups) groups)))

           (setq to (completing-read 
                     "Followups to: (default all groups) " groups))
           (if (> (length to) 0)
               (progn
                 (goto-char (point-min))
                 (insert "Followup-To: " to "\n")))))))

  ;; Cleanup Followup-To.
  (goto-char (point-min))
  (if (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))
        (replace-regexp "\n[ \t]+" " ") ;No line breaks (too confusing)
        (goto-char (point-min))
        (replace-regexp "[ \t\n]*,[ \t\n]*\\|[ \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)))))
  
(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 nil)
        (Lines (gnus-inews-lines))
        (X-Newsreader gnus-version)
        (X-Mailer gnus-version)
        (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-bol))
              (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")))
      (if (and from 
               (not (gnus-check-before-posting 'sender))
               (not (string=
                     (downcase (car (gnus-extract-address-components from)))
                     (downcase (gnus-inews-real-user-address))))
               (or (null sender)
                   (not 
                    (string=
                     (downcase (car (gnus-extract-address-components sender)))
                     (downcase (gnus-inews-real-user-address))))))
          (progn
            (goto-char (point-min))    
            (and (re-search-forward "^Sender:" nil t)
                 (progn
                   (beginning-of-line)
                   (insert "Original-")
                   (beginning-of-line)))
            (insert "Sender: " (gnus-inews-real-user-address) "\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 ((progn
                 (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
        (gnus-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)
                (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) "@" (gnus-inews-full-address)))

(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")
                  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)
      (substring user-mail-address 
                 (1+ (string-match "@" user-mail-address))))))

(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-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 ()
  ;; Dont 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."
  (timezone-make-date-arpa-standard 
   (current-time-string) (current-time-zone)))

(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 (and (symbolp gnus-local-organization)
                           (fboundp 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-article-copy)
    (gnus-mail-forward gnus-article-copy)))

(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))

(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)
    (run-hooks 'gnus-mail-hook)))

(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)
      (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)
            (gnus-narrow-to-headers)
            (if (not followup)
                ;; This is a regular reply.
                (if (and (symbolp gnus-reply-to-function)
                         (fboundp gnus-reply-to-function))
                    (setq follow-to (funcall gnus-reply-to-function group)))
              ;; This is a followup.
              (if (and (symbolp gnus-followup-to-function)
                       (fboundp 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 reply-to (mail-fetch-field "reply-to"))
            (setq references (mail-fetch-field "references"))
            (setq message-id (mail-fetch-field "message-id"))

            (if (not followup)
                ()
              ;; When we followup, we want all the headers, I would think.
              (setq new-cc (rmail-dont-reply-to 
                            (concat (or to "")
                                    (if cc (concat (if to ", " "") cc) ""))))
              (let ((rmail-dont-reply-to-names 
                     (regexp-quote (mail-strip-quoted-names
                                    (or to-address reply-to from "")))))
                (setq new-cc (rmail-dont-reply-to new-cc))))

            (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 reply-to from 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)

        (if (and follow-to (listp follow-to))
            (progn
              (goto-char (point-min))
              (re-search-forward "^To:" nil t)
              (beginning-of-line)
              (forward-line 1)
              (while follow-to
                (insert (car (car follow-to)) ": " (cdr (car follow-to)) "\n")
                (setq follow-to (cdr follow-to)))))
        (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
                  (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 (point)))
                (or mail-yank-hooks mail-citation-hook
                    (run-hooks 'news-reply-header-hook))
                (goto-char end)
                (setq yank (cdr yank))))
            (goto-char last))
          (forward-line 2)
          (gnus-configure-windows 'reply-yank 'force))
        (run-hooks 'gnus-mail-hook)))))

(defun gnus-new-news (&optional group inhibit-prompt)
  "Set up a *post-news* 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)
    (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-signature)
    (and gnus-post-prepare-function
         (symbolp gnus-post-prepare-function)
         (fboundp gnus-post-prepare-function)
         (funcall gnus-post-prepare-function group))
    (goto-char (point-min))
    (if group
        (re-search-forward "^Subject: " nil t)
      (re-search-forward "^Newsgroups: " nil t))
    (run-hooks 'gnus-post-prepare-hook)
    (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 reply-to message-of
            references message-id sender follow-to sendto elt 
            followup-to distribution newsgroups)
        (set-buffer (get-buffer-create gnus-post-news-buffer))
        (news-reply-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)
              (gnus-narrow-to-headers)
              (if (and (symbolp gnus-followup-to-function)
                       (fboundp 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"))
              (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 
                          (and followup-to
                               gnus-use-followup-to
                               (or (not (eq gnus-use-followup-to 'ask))
                                   (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)

          (gnus-inews-insert-signature)

          (and gnus-post-prepare-function
               (symbolp gnus-post-prepare-function)
               (fboundp 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 (car (car follow-to)) ": " 
                          (cdr (car 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)
                              (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)

          ;; 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 (point)))
                  (or mail-yank-hooks mail-citation-hook
                      (run-hooks 'news-reply-header-hook))
                  (goto-char end)
                  (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))))))))

(defun gnus-message-of (from date)
  "Take a FROM and a DATE and create an IN-REPLY-TO."
  (cond 
   ((not from)
    nil)
   (t
    (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)
    (or dont-send (gnus-mail-send))
    (bury-buffer)
    ;; This mail group doesn't have a `to-address', so we add one
    ;; here.  Magic!  
    (and to-address
         (gnus-group-add-parameter 
          address-group (cons 'to-address to-address)))
    (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-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)
        buf)
    
    (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)
  (let ((beg (goto-char (point-max))))
    (insert "------- Start of forwarded message -------\n")
    (insert-buffer-substring buffer)
    (goto-char (point-max))
    (insert "------- End of forwarded message -------\n")
    ;; Suggested by Sudish Joseph <joseph@cis.ohio-state.edu>. 
    (goto-char beg)
    (while (setq beg (next-single-property-change (point) 'invisible))
      (goto-char beg)
      (delete-region beg (or (next-single-property-change 
                              (point) 'invisible)
                             (point-max))))))

(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 (format "%s\n%s\n\n\n\n\n" (gnus-version) (emacs-version)))
    (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)
  (and (get-buffer "*Gnus Help Bug*")
       (kill-buffer "*Gnus Help Bug*"))
  (gnus-mail-send-and-exit))

(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"))
        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))
            (or (re-search-forward "^;;* *Internal variables" nil t)
                (error "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)))
    (insert "------------------- Environment follows -------------------\n\n")
    (while olist
      (if (boundp (car olist))
          (insert "(setq " (symbol-name (car olist)) 
                  (if (or (consp (setq sym (symbol-value (car olist))))
                          (and (symbolp sym)
                               (not (or (eq sym nil)
                                        (eq sym t)))))
                      " '" " ")
                  (prin1-to-string (symbol-value (car olist))) ")\n")
        (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.

(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")
  (gnus-summary-select-article t)
  ;; Create a mail buffer.
  (gnus-new-mail)
  (erase-buffer)
  (insert-buffer-substring gnus-article-buffer)
  (goto-char (point-min))
  (search-forward "\n\n")
  ;; 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
        (gnus-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 ()
  "Send the current buffer as mail.
Headers will be generated before sending."
  (interactive)
  (save-excursion
    (save-restriction
      (widen)
      (gnus-inews-narrow-to-headers)
      (gnus-inews-insert-headers gnus-required-mail-headers)
      (gnus-inews-remove-empty-headers)))
  (widen)
  ;; 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)
  (gnus-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)))
  (local-set-key "\C-c\C-c" 'gnus-mail-send-and-exit)
  (local-set-key "\C-c\C-p" 'gnus-put-message)
  (local-set-key "\C-c\C-d" 'gnus-enter-into-draft-group))

(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 
      (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 
      (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)
    (t 'gnus-sendmail-mail-setup))
   to subject in-reply-to cc replybuffer actions))

(defun gnus-sendmail-mail-setup (to subject in-reply-to cc replybuffer actions)
  (mail-mode)
  (mail-setup to subject nil cc replybuffer actions)
  (goto-char (point-min))
  (if (re-search-forward 
       (concat "^" (regexp-quote mail-header-separator) "$") nil t)
      (forward-line 1)
    (goto-char (point-max)))
;  (insert "\n\n")
  (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
      (gnus-narrow-to-headers)
      (let ((gcc (or gcc (mail-fetch-field "gcc" nil t)))
            end)
        (if (not gcc)
            () ; Nothing to be done.
          (nnheader-remove-header "gcc")
          ;; Copy the article over to some group(s).
          (while (string-match
                  "^[ \t]*\\([^ \t]+\\)\\([ \t]+\\|$\\)" gcc)
            (setq end (match-end 0))
            (condition-case ()
                (gnus-request-accept-article 
                 (substring gcc (match-beginning 1) (match-end 1)) t)
              (error nil))
            (setq gcc (substring gcc end))))))))

(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 ()
  (let* ((group gnus-outgoing-message-group)
         (gcc (cond 
               ((and (symbolp group) (fboundp group))
                (funcall group))
               ((or (stringp group) (list group))
                group))))
    (when gcc
      (insert "Gcc: "
              (if (stringp group) group
                (mapconcat 'identity group " "))
              "\n"))))

;;; Handling rejected (and postponed) news.

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

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

(defun gnus-enter-into-draft-group ()
  "Enter the current buffer into the draft group."
  (interactive)
  (gnus-put-in-draft-group t))

(defun gnus-put-in-draft-group (&optional generate silent)
  "Does the actual putting."
  (let ((group (gnus-make-draft-group))
        (type (list major-mode (buffer-name) gnus-newsgroup-name
                    (point)))
        (mode major-mode)
        (buf (current-buffer)))
    (widen)
    (save-excursion
      (nnheader-set-temp-buffer " *enter-draft*")
      (insert-buffer-substring buf)
      (save-restriction
        (widen)
        (gnus-inews-narrow-to-headers)
        (let (gnus-deletable-headers)
          (if (eq mode 'mail-mode)
              (gnus-inews-insert-headers gnus-required-mail-headers)
            (gnus-inews-insert-headers)))
        (widen))

      (goto-char (point-min))
      ;; We have to store whether we are in a mail group or news group. 
      (insert (format "X-Gnus-Draft-Type: %S\n" type))
      (and (re-search-forward
            (concat "^" (regexp-quote mail-header-separator) "$") nil t)
           (replace-match "" t t))
      (if (prog1
              (gnus-request-accept-article group t)
            (kill-buffer (current-buffer)))
          (or silent
              (gnus-mail-send-and-exit 'dont-send))))
    (set-buffer-modified-p nil)))

(defun gnus-summary-send-draft ()
  "Enter a mail/post buffer to edit and send the draft."
  (interactive)
  (gnus-set-global-variables)
  (gnus-summary-select-article t)
  ;; First we find the draft type.
  (let (type)
    (save-excursion 
      (set-buffer gnus-article-buffer)
      (widen)
      (gnus-narrow-to-headers)
      (setq type (condition-case ()
                     (read (mail-fetch-field "x-gnus-draft-type"))
                   (error nil)))
      (widen))
    (or type
        (error "Unknown draft type"))
    ;; Get to the proper buffer.
    (set-buffer (get-buffer-create (nth 1 type)))
    ;; It might be modified.
    (and (buffer-modified-p)
         (or (gnus-yes-or-no-p "Unsent message being composed; discard it? ")
             (error "Break")))
    (setq buffer-read-only nil)
    (buffer-enable-undo (current-buffer))
    (erase-buffer)
    ;; Set proper mode.
    (funcall (car type))
    (and (eq major-mode 'mail-mode)
         (gnus-inews-modify-mail-mode-map))
    ;; Arrange for deletion of the draft after successful sending.
    (make-local-variable 'gnus-message-sent-hook)
    (setq gnus-message-sent-hook
          (list
           (`
            (lambda ()
              (gnus-request-expire-articles 
               (quote (, (list (cdr gnus-article-current))))
               (, gnus-newsgroup-name) t)))))
    ;; Insert the draft.
    (insert-buffer-substring gnus-article-buffer)
    ;; Insert the separator.
    (goto-char (point-min))
    (search-forward "\n\n")
    (forward-char -1)
    (insert mail-header-separator)
    ;; Remove the draft header.
    (gnus-inews-narrow-to-headers)
    (nnheader-remove-header "x-gnus-draft-type")
    (widen)
    ;; Configure windows.
    (let ((gnus-draft-buffer (current-buffer)))
      (gnus-configure-windows 'draft))
    ;; Put point where you left it.
    (goto-char (nth 3 type))))
  
(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))
                  ((symbolp match)
                   (cond ((fboundp 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)
                        ((symbolp value)
                         (cond ((fboundp 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)))))))))

;;; Allow redefinition of functions.

(gnus-ems-redefine)

(provide 'gnus-msg)

;;; gnus-msg.el ends here