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;;; gnus-msg.el --- mail and post interface for Gnus
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;; Copyright (C) 1995-2012  Free Software Foundation, Inc.
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;; Author: Masanobu UMEDA <umerin@flab.flab.fujitsu.junet>
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;;	Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; Keywords: news

;; This file is part of GNU Emacs.

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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; 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
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

;;; Code:

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(eval-when-compile (require 'cl))

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(require 'gnus)
(require 'gnus-ems)
(require 'message)
(require 'gnus-art)
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(require 'gnus-util)
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(defcustom gnus-post-method 'current
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  "*Preferred method for posting USENET news.

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If this variable is `current' (which is the default), Gnus will use
the \"current\" select method when posting.  If it is `native', Gnus
will use the native select method when posting.
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This method will not be used in mail groups and the like, only in
\"real\" newsgroups.

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If not `native' nor `current', the value must be a valid method as discussed
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in the documentation of `gnus-select-method'.  It can also be a list of
methods.  If that is the case, the user will be queried for what select
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method to use when posting."
  :group 'gnus-group-foreign
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  :link '(custom-manual "(gnus)Posting Server")
  :type `(choice (const native)
		 (const current)
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		 (sexp :tag "Methods" ,gnus-select-method)))
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(defcustom gnus-outgoing-message-group nil
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  "All outgoing messages will be put in this group.
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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
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of names)."
  :group 'gnus-message
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  :type '(choice (const nil)
		 (function)
		 (string :tag "Group")
		 (repeat :tag "List of groups" (string :tag "Group"))))
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(make-obsolete-variable 'gnus-outgoing-message-group 'gnus-message-archive-group "24.1")

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(defcustom gnus-mailing-list-groups nil
  "*If non-nil a regexp matching groups that are really mailing lists.
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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
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the group."
  :group 'gnus-message
  :type '(choice (regexp)
		 (const nil)))
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(defcustom gnus-add-to-list nil
  "*If non-nil, add a `to-list' parameter automatically."
  :group 'gnus-message
  :type 'boolean)
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(defcustom gnus-crosspost-complaint
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  "Hi,

You posted the article below with the following Newsgroups header:

Newsgroups: %s

The %s group, at least, was an inappropriate recipient
of this message.  Please trim your Newsgroups header to exclude this
group before posting in the future.

Thank you.

"
  "Format string to be inserted when complaining about crossposts.
The first %s will be replaced by the Newsgroups header;
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the second with the current group name."
  :group 'gnus-message
  :type 'string)

(defcustom gnus-message-setup-hook nil
  "Hook run after setting up a message buffer."
  :group 'gnus-message
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  :options '(message-remove-blank-cited-lines)
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  :type 'hook)

(defcustom gnus-bug-create-help-buffer t
  "*Should we create the *Gnus Help Bug* buffer?"
  :group 'gnus-message
  :type 'boolean)

(defcustom gnus-posting-styles nil
  "*Alist of styles to use when posting.
See Info node `(gnus)Posting Styles'."
  :group 'gnus-message
  :link '(custom-manual "(gnus)Posting Styles")
  :type '(repeat (cons (choice (regexp)
			       (variable)
			       (list (const header)
				     (string :tag "Header")
				     (regexp :tag "Regexp"))
			       (function)
			       (sexp))
		       (repeat (list
				(choice (const signature)
					(const signature-file)
					(const organization)
					(const address)
					(const x-face-file)
					(const name)
					(const body)
					(symbol)
					(string :tag "Header"))
				(choice (string)
					(function)
					(variable)
					(sexp)))))))

(defcustom gnus-gcc-mark-as-read nil
  "If non-nil, automatically mark Gcc articles as read."
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  :version "22.1"
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  :group 'gnus-message
  :type 'boolean)

(make-obsolete-variable 'gnus-inews-mark-gcc-as-read
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			'gnus-gcc-mark-as-read "Emacs 22.1")
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(defcustom gnus-gcc-externalize-attachments nil
  "Should local-file attachments be included as external parts in Gcc copies?
If it is `all', attach files as external parts;
if a regexp and matches the Gcc group name, attach files as external parts;
if nil, attach files as normal parts."
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  :version "22.1"
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  :group 'gnus-message
  :type '(choice (const nil :tag "None")
		 (const all :tag "Any")
		 (string :tag "Regexp")))

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(defcustom gnus-gcc-self-resent-messages 'no-gcc-self
  "Like `gcc-self' group parameter, only for unmodified resent messages.
Applied to messages sent by `gnus-summary-resend-message'.  Non-nil
value of this variable takes precedence over any existing Gcc header.

If this is `none', no Gcc copy will be made.  If this is t, messages
resent will be Gcc'd to the current group.  If this is a string, it
specifies a group to which resent messages will be Gcc'd.  If this is
nil, Gcc will be done according to existing Gcc header(s), if any.
If this is `no-gcc-self', resent messages will be Gcc'd to groups that
existing Gcc header specifies, except for the current group."
  :version "24.2"
  :group 'gnus-message
  :type '(choice (const none) (const t) string (const nil)
		 (const no-gcc-self)))

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(gnus-define-group-parameter
 posting-charset-alist
 :type list
 :function-document
 "Return the permitted unencoded charsets for posting of GROUP."
 :variable gnus-group-posting-charset-alist
 :variable-default
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  '(("^\\(no\\|fr\\)\\.[^,]*\\(,[ \t\n]*\\(no\\|fr\\)\\.[^,]*\\)*$" iso-8859-1 (iso-8859-1))
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    ("^\\(fido7\\|relcom\\)\\.[^,]*\\(,[ \t\n]*\\(fido7\\|relcom\\)\\.[^,]*\\)*$" koi8-r (koi8-r))
    (message-this-is-mail nil nil)
    (message-this-is-news nil t))
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 :variable-document
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  "Alist of regexps and permitted unencoded charsets for posting.
Each element of the alist has the form (TEST HEADER BODY-LIST), where
TEST is either a regular expression matching the newsgroup header or a
variable to query,
HEADER is the charset which may be left unencoded in the header (nil
means encode all charsets),
BODY-LIST is a list of charsets which may be encoded using 8bit
content-transfer encoding in the body, or one of the special values
nil (always encode using quoted-printable) or t (always use 8bit).

Note that any value other than nil for HEADER infringes some RFCs, so
use this option with care."
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 :variable-group gnus-charset
 :variable-type
 '(repeat (list :tag "Permitted unencoded charsets"
		(choice :tag "Where"
			(regexp :tag "Group")
			(const :tag "Mail message" :value message-this-is-mail)
			(const :tag "News article" :value message-this-is-news))
		(choice :tag "Header"
			(const :tag "None" nil)
			(symbol :tag "Charset"))
		(choice :tag "Body"
			(const :tag "Any" :value t)
			(const :tag "None" :value nil)
			(repeat :tag "Charsets"
				(symbol :tag "Charset")))))
 :parameter-type '(choice :tag "Permitted unencoded charsets"
			  :value nil
			  (repeat (symbol)))
 :parameter-document       "\
List of charsets that are permitted to be unencoded.")

(defcustom gnus-debug-files
  '("gnus.el" "gnus-sum.el" "gnus-group.el"
    "gnus-art.el" "gnus-start.el" "gnus-async.el"
    "gnus-msg.el" "gnus-score.el" "gnus-win.el" "gnus-topic.el"
    "gnus-agent.el" "gnus-cache.el" "gnus-srvr.el"
    "mm-util.el" "mm-decode.el" "nnmail.el" "message.el")
  "Files whose variables will be reported in `gnus-bug'."
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  :version "22.1"
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  :group 'gnus-message
  :type '(repeat (string :tag "File")))

(defcustom gnus-debug-exclude-variables
  '(mm-mime-mule-charset-alist
    nnmail-split-fancy message-minibuffer-local-map)
  "Variables that should not be reported in `gnus-bug'."
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  :version "22.1"
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  :group 'gnus-message
  :type '(repeat (symbol :tag "Variable")))

(defcustom gnus-discouraged-post-methods
  '(nndraft nnml nnimap nnmaildir nnmh nnfolder nndir)
  "A list of back ends that are not used in \"real\" newsgroups.
This variable is used only when `gnus-post-method' is `current'."
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  :version "22.1"
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  :group 'gnus-group-foreign
  :type '(repeat (symbol :tag "Back end")))

(defcustom gnus-message-replysign
  nil
  "Automatically sign replies to signed messages.
See also the `mml-default-sign-method' variable."
  :group 'gnus-message
  :type 'boolean)

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(defcustom gnus-message-replyencrypt t
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  "Automatically encrypt replies to encrypted messages.
See also the `mml-default-encrypt-method' variable."
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  :version "24.1"
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  :group 'gnus-message
  :type 'boolean)

(defcustom gnus-message-replysignencrypted
  t
  "Setting this causes automatically encrypted messages to also be signed."
  :group 'gnus-message
  :type 'boolean)

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(defcustom gnus-confirm-mail-reply-to-news (and gnus-novice-user
						(not gnus-expert-user))
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  "If non-nil, Gnus requests confirmation when replying to news.
This is done because new users often reply by mistake when reading
news.
This can also be a function receiving the group name as the only
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parameter, which should return non-nil if a confirmation is needed; or
a regexp, in which case a confirmation is asked for if the group name
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matches the regexp."
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  :version "23.1" ;; No Gnus (default changed)
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  :group 'gnus-message
  :type '(choice (const :tag "No" nil)
		 (const :tag "Yes" t)
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		 (regexp :tag "If group matches regexp")
		 (function :tag "If function evaluates to non-nil")))
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(defcustom gnus-confirm-treat-mail-like-news
  nil
  "If non-nil, Gnus will treat mail like news with regard to confirmation
when replying by mail.  See the `gnus-confirm-mail-reply-to-news' variable
for fine-tuning this.
If nil, Gnus will never ask for confirmation if replying to mail."
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  :version "22.1"
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  :group 'gnus-message
  :type 'boolean)

(defcustom gnus-summary-resend-default-address t
  "If non-nil, Gnus tries to suggest a default address to resend to.
If nil, the address field will always be empty after invoking
`gnus-summary-resend-message'."
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  :version "22.1"
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  :group 'gnus-message
  :type 'boolean)
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(defcustom gnus-message-highlight-citation
  t ;; gnus-treat-highlight-citation ;; gnus-cite dependency
  "Enable highlighting of different citation levels in message-mode."
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  :version "23.1" ;; No Gnus
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  :group 'gnus-cite
  :group 'gnus-message
  :type 'boolean)

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(defcustom gnus-gcc-pre-body-encode-hook nil
  "A hook called before encoding the body of the Gcc copy of a message.
The current buffer (when the hook is run) contains the message
including the message header.  Changes made to the message will
only affect the Gcc copy, but not the original message."
  :group 'gnus-message
  :type 'hook)

(defcustom gnus-gcc-post-body-encode-hook nil
    "A hook called after encoding the body of the Gcc copy of a message.
The current buffer (when the hook is run) contains the message
including the message header.  Changes made to the message will
only affect the Gcc copy, but not the original message."
  :group 'gnus-message
  :type 'hook)

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(autoload 'gnus-message-citation-mode "gnus-cite" nil t)

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;;; Internal variables.

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(defvar gnus-inhibit-posting-styles nil
  "Inhibit the use of posting styles.")

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(defvar gnus-article-yanked-articles nil)
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(defvar gnus-message-buffer "*Mail Gnus*")
(defvar gnus-article-copy nil)
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(defvar gnus-check-before-posting nil)
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(defvar gnus-last-posting-server nil)
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(defvar gnus-message-group-art nil)
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(defvar gnus-msg-force-broken-reply-to nil)

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(defconst gnus-bug-message
  "Sending a bug report to the Gnus Towers.
========================================

The buffer below is a mail buffer.  When you press `C-c C-c', it will
be sent to the Gnus Bug Exterminators.

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The thing near the bottom of the buffer is how the environment
settings will be included in the mail.  Please do not delete that.
They will tell the Bug People what your environment is, so that it
will be easier to locate the bugs.
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If you have found a bug that makes Emacs go \"beep\", set
debug-on-error to t (`M-x set-variable RET debug-on-error RET t RET')
and include the backtrace in your bug report.

Please describe the bug in annoying, painstaking detail.

Thank you for your help in stamping out bugs.
")

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(autoload 'gnus-uu-post-news "gnus-uu" nil t)
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;;;
;;; Gnus Posting Functions
;;;

(gnus-define-keys (gnus-summary-send-map "S" gnus-summary-mode-map)
  "p" gnus-summary-post-news
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  "i" gnus-summary-news-other-window
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  "f" gnus-summary-followup
  "F" gnus-summary-followup-with-original
  "c" gnus-summary-cancel-article
  "s" gnus-summary-supersede-article
  "r" gnus-summary-reply
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  "y" gnus-summary-yank-message
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  "R" gnus-summary-reply-with-original
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  "L" gnus-summary-reply-to-list-with-original
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  "w" gnus-summary-wide-reply
  "W" gnus-summary-wide-reply-with-original
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  "v" gnus-summary-very-wide-reply
  "V" gnus-summary-very-wide-reply-with-original
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  "n" gnus-summary-followup-to-mail
  "N" gnus-summary-followup-to-mail-with-original
  "m" gnus-summary-mail-other-window
  "u" gnus-uu-post-news
  "\M-c" gnus-summary-mail-crosspost-complaint
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  "Br" gnus-summary-reply-broken-reply-to
  "BR" gnus-summary-reply-broken-reply-to-with-original
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  "om" gnus-summary-mail-forward
  "op" gnus-summary-post-forward
  "Om" gnus-uu-digest-mail-forward
  "Op" gnus-uu-digest-post-forward)

(gnus-define-keys (gnus-send-bounce-map "D" gnus-summary-send-map)
  "b" gnus-summary-resend-bounced-mail
  ;; "c" gnus-summary-send-draft
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  "r" gnus-summary-resend-message
  "e" gnus-summary-resend-message-edit)
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;;; Internal functions.

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(defun gnus-inews-make-draft (articles)
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  `(lambda ()
     (gnus-inews-make-draft-meta-information
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      ,(gnus-group-decoded-name gnus-newsgroup-name) ',articles)))
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(defvar gnus-article-reply nil)
(defmacro gnus-setup-message (config &rest forms)
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  (let ((winconf (make-symbol "gnus-setup-message-winconf"))
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	(winconf-name (make-symbol "gnus-setup-message-winconf-name"))
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	(buffer (make-symbol "gnus-setup-message-buffer"))
	(article (make-symbol "gnus-setup-message-article"))
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	(yanked (make-symbol "gnus-setup-yanked-articles"))
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	(group (make-symbol "gnus-setup-message-group")))
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    `(let ((,winconf (current-window-configuration))
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	   (,winconf-name gnus-current-window-configuration)
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	   (,buffer (buffer-name (current-buffer)))
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	   (,article gnus-article-reply)
	   (,yanked gnus-article-yanked-articles)
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	   (,group gnus-newsgroup-name)
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	   (message-header-setup-hook
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	    (copy-sequence message-header-setup-hook))
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	   (mbl mml-buffer-list)
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	   (message-mode-hook (copy-sequence message-mode-hook)))
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       (setq mml-buffer-list nil)
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       (add-hook 'message-header-setup-hook 'gnus-inews-insert-gcc)
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       ;; message-newsreader and message-mailer were formerly set in
       ;; gnus-inews-add-send-actions, but this is too late when
       ;; message-generate-headers-first is used. --ansel
       (add-hook 'message-mode-hook
		 (lambda nil
		   (setq message-newsreader
			 (setq message-mailer (gnus-extended-version)))))
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       ;; #### FIXME: for a reason that I did not manage to identify yet,
       ;; the variable `gnus-newsgroup-name' does not honor a dynamically
       ;; scoped or setq'ed value from a caller like `C-u gnus-summary-mail'.
       ;; After evaluation of @forms below, it gets the value we actually want
       ;; to override, and the posting styles are used. For that reason, I've
       ;; added an optional argument to `gnus-configure-posting-styles' to
       ;; make sure that the correct value for the group name is used. -- drv
       (add-hook 'message-mode-hook
		 (if (memq ,config '(reply-yank reply))
		     (lambda ()
		       (gnus-configure-posting-styles ,group))
		   (lambda ()
		     ;; There may be an old " *gnus article copy*" buffer.
		     (let (gnus-article-copy)
		       (gnus-configure-posting-styles ,group)))))
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       (gnus-alist-pull ',(intern gnus-draft-meta-information-header)
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		  message-required-headers)
       (when (and ,group
		  (not (string= ,group "")))
	 (push (cons
		(intern gnus-draft-meta-information-header)
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		(gnus-inews-make-draft (or ,yanked ,article)))
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	       message-required-headers))
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       (unwind-protect
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	   (progn
	     ,@forms)
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	 (gnus-inews-add-send-actions ,winconf ,buffer ,article ,config
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				      ,yanked ,winconf-name)
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	 (setq gnus-message-buffer (current-buffer))
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	 (set (make-local-variable 'gnus-message-group-art)
	      (cons ,group ,article))
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	 (set (make-local-variable 'gnus-newsgroup-name) ,group)
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	 ;; Enable highlighting of different citation levels
	 (when gnus-message-highlight-citation
	   (gnus-message-citation-mode 1))
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	 (gnus-run-hooks 'gnus-message-setup-hook)
	 (if (eq major-mode 'message-mode)
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	     (let ((mbl1 mml-buffer-list))
	       (setq mml-buffer-list mbl)  ;; Global value
	       (set (make-local-variable 'mml-buffer-list) mbl1);; Local value
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	       (gnus-make-local-hook 'kill-buffer-hook)
	       (gnus-make-local-hook 'change-major-mode-hook)
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	       (add-hook 'change-major-mode-hook 'mml-destroy-buffers nil t)
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	       (add-hook 'kill-buffer-hook 'mml-destroy-buffers t t))
	   (mml-destroy-buffers)
	   (setq mml-buffer-list mbl)))
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       (message-hide-headers)
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       (gnus-add-buffer)
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       (gnus-configure-windows ,config t)
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       (run-hooks 'post-command-hook)
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       (set-buffer-modified-p nil))))

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(defun gnus-inews-make-draft-meta-information (group articles)
  (when (numberp articles)
    (setq articles (list articles)))
  (concat "(\"" group "\""
	  (if articles
	      (concat " "
		      (mapconcat
		       (lambda (elem)
			 (number-to-string
			  (if (consp elem)
			      (car elem)
			    elem)))
		       articles " "))
	    "")
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	  ")"))

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;;;###autoload
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(defun gnus-msg-mail (&optional to subject other-headers continue
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				switch-action yank-action send-actions
				return-action)
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  "Start editing a mail message to be sent.
Like `message-mail', but with Gnus paraphernalia, particularly the
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Gcc: header for archiving purposes.
If Gnus isn't running, a plain `message-mail' setup is used
instead."
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  (interactive)
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  (if (not (gnus-alive-p))
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      (progn
	(message "Gnus not running; using plain Message mode")
	(message-mail to subject other-headers continue
		      nil yank-action send-actions return-action))
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    (let ((buf (current-buffer))
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	  (gnus-newsgroup-name (or gnus-newsgroup-name ""))
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	  mail-buf)
      (gnus-setup-message 'message
	(message-mail to subject other-headers continue
		      nil yank-action send-actions return-action))
      (when switch-action
	(setq mail-buf (current-buffer))
	(switch-to-buffer buf)
	(apply switch-action mail-buf nil))
      ;; COMPOSEFUNC should return t if succeed.  Undocumented ???
      t)))
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;;;###autoload
(defun gnus-button-mailto (address)
  "Mail to ADDRESS."
  (set-buffer (gnus-copy-article-buffer))
  (gnus-setup-message 'message
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    (message-reply address)))
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;;;###autoload
(defun gnus-button-reply (&optional to-address wide)
  "Like `message-reply'."
  (interactive)
  (gnus-setup-message 'message
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    (message-reply to-address wide)))
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;;;###autoload
(define-mail-user-agent 'gnus-user-agent
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  'gnus-msg-mail 'message-send-and-exit
  'message-kill-buffer 'message-send-hook)
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(defun gnus-setup-posting-charset (group)
  (let ((alist gnus-group-posting-charset-alist)
	(group (or group ""))
	elem)
    (when group
      (catch 'found
	(while (setq elem (pop alist))
	  (when (or (and (stringp (car elem))
			 (string-match (car elem) group))
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		    (and (functionp (car elem))
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			 (funcall (car elem) group))
		    (and (symbolp (car elem))
			 (symbol-value (car elem))))
	    (throw 'found (cons (cadr elem) (caddr elem)))))))))

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(defun gnus-inews-add-send-actions (winconf buffer article
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					    &optional config yanked
					    winconf-name)
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  (gnus-make-local-hook 'message-sent-hook)
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  (add-hook 'message-sent-hook (if gnus-agent 'gnus-agent-possibly-do-gcc
				 'gnus-inews-do-gcc) nil t)
  (when gnus-agent
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    (gnus-make-local-hook 'message-header-hook)
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    (add-hook 'message-header-hook 'gnus-agent-possibly-save-gcc nil t))
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  (setq message-post-method
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	`(lambda (&optional arg)
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	   (gnus-post-method arg ,gnus-newsgroup-name)))
  (message-add-action
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   `(progn
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      (setq gnus-current-window-configuration ',winconf-name)
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      (when (gnus-buffer-exists-p ,buffer)
	(set-window-configuration ,winconf)))
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   'exit 'postpone 'kill)
  (let ((to-be-marked (cond
		       (yanked
			(mapcar
			 (lambda (x) (if (listp x) (car x) x)) yanked))
		       (article (if (listp article) article (list article)))
		       (t nil))))
    (message-add-action
     `(when (gnus-buffer-exists-p ,buffer)
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	(with-current-buffer ,buffer
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	  ,(when to-be-marked
	     (if (eq config 'forward)
		 `(gnus-summary-mark-article-as-forwarded ',to-be-marked)
	       `(gnus-summary-mark-article-as-replied ',to-be-marked)))))
     'send)))
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(put 'gnus-setup-message 'lisp-indent-function 1)
(put 'gnus-setup-message 'edebug-form-spec '(form body))

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

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(defun gnus-group-mail (&optional arg)
  "Start composing a mail.
If ARG, use the group under the point to find a posting style.
If ARG is 1, prompt for a group name to find the posting style."
  (interactive "P")
  ;; We can't `let' gnus-newsgroup-name here, since that leads
  ;; to local variables leaking.
  (let ((group gnus-newsgroup-name)
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	;; make sure last viewed article doesn't affect posting styles:
	(gnus-article-copy)
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	(buffer (current-buffer)))
    (unwind-protect
	(progn
	  (setq gnus-newsgroup-name
		(if arg
		    (if (= 1 (prefix-numeric-value arg))
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			(gnus-group-completing-read
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			 "Use posting style of group"
			 nil (gnus-read-active-file-p))
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		      (gnus-group-group-name))
		  ""))
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	  ;; #### see comment in gnus-setup-message -- drv
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	  (gnus-setup-message 'message (message-mail)))
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      (with-current-buffer buffer
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	(setq gnus-newsgroup-name group)))))
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(defun gnus-group-news (&optional arg)
  "Start composing a news.
If ARG, post to group under point.
If ARG is 1, prompt for group name to post to.

This function prepares a news even when using mail groups.  This is useful
for posting messages to mail groups without actually sending them over the
network.  The corresponding back end must have a 'request-post method."
  (interactive "P")
  ;; We can't `let' gnus-newsgroup-name here, since that leads
  ;; to local variables leaking.
  (let ((group gnus-newsgroup-name)
	;; make sure last viewed article doesn't affect posting styles:
	(gnus-article-copy)
	(buffer (current-buffer)))
    (unwind-protect
	(progn
	  (setq gnus-newsgroup-name
		(if arg
		    (if (= 1 (prefix-numeric-value arg))
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			(gnus-group-completing-read "Use group"
						    nil
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						    (gnus-read-active-file-p))
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		      (gnus-group-group-name))
		  ""))
	  ;; #### see comment in gnus-setup-message -- drv
	  (gnus-setup-message 'message
	    (message-news (gnus-group-real-name gnus-newsgroup-name))))
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      (with-current-buffer buffer
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	(setq gnus-newsgroup-name group)))))

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(defun gnus-group-post-news (&optional arg)
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  "Start composing a message (a news by default).
If ARG, post to group under point.  If ARG is 1, prompt for group name.
Depending on the selected group, the message might be either a mail or
a news."
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  (interactive "P")
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  ;; Bind this variable here to make message mode hooks work ok.
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  (let ((gnus-newsgroup-name
	 (if arg
	     (if (= 1 (prefix-numeric-value arg))
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		 (gnus-group-completing-read "Newsgroup" nil
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					     (gnus-read-active-file-p))
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	       (or (gnus-group-group-name) ""))
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	   ""))
	;; make sure last viewed article doesn't affect posting styles:
	(gnus-article-copy))
    (gnus-post-news 'post gnus-newsgroup-name nil nil nil nil
		    (string= gnus-newsgroup-name ""))))

(defun gnus-summary-mail-other-window (&optional arg)
  "Start composing a mail in another window.
Use the posting of the current group by default.
If ARG, don't do that.  If ARG is 1, prompt for group name to find the
posting style."
  (interactive "P")
  ;; We can't `let' gnus-newsgroup-name here, since that leads
  ;; to local variables leaking.
  (let ((group gnus-newsgroup-name)
	;; make sure last viewed article doesn't affect posting styles:
	(gnus-article-copy)
	(buffer (current-buffer)))
    (unwind-protect
	(progn
	  (setq gnus-newsgroup-name
		(if arg
		    (if (= 1 (prefix-numeric-value arg))
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			(gnus-group-completing-read "Use group"
						    nil
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						    (gnus-read-active-file-p))
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		      "")
		  gnus-newsgroup-name))
	  ;; #### see comment in gnus-setup-message -- drv
	  (gnus-setup-message 'message (message-mail)))
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      (with-current-buffer buffer
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	(setq gnus-newsgroup-name group)))))

(defun gnus-summary-news-other-window (&optional arg)
  "Start composing a news in another window.
Post to the current group by default.
If ARG, don't do that.  If ARG is 1, prompt for group name to post to.

This function prepares a news even when using mail groups.  This is useful
for posting messages to mail groups without actually sending them over the
network.  The corresponding back end must have a 'request-post method."
  (interactive "P")
  ;; We can't `let' gnus-newsgroup-name here, since that leads
  ;; to local variables leaking.
  (let ((group gnus-newsgroup-name)
	;; make sure last viewed article doesn't affect posting styles:
	(gnus-article-copy)
	(buffer (current-buffer)))
    (unwind-protect
	(progn
	  (setq gnus-newsgroup-name
		(if arg
		    (if (= 1 (prefix-numeric-value arg))
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			(gnus-group-completing-read "Use group"
						    nil
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						    (gnus-read-active-file-p))
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		      "")
		  gnus-newsgroup-name))
	  ;; #### see comment in gnus-setup-message -- drv
	  (gnus-setup-message 'message
	    (progn
	      (message-news (gnus-group-real-name gnus-newsgroup-name))
	      (set (make-local-variable 'gnus-discouraged-post-methods)
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		   (remove
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		    (car (gnus-find-method-for-group gnus-newsgroup-name))
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		    gnus-discouraged-post-methods)))))
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      (with-current-buffer buffer
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	(setq gnus-newsgroup-name group)))))

(defun gnus-summary-post-news (&optional arg)
  "Start composing a message.  Post to the current group by default.
If ARG, don't do that.  If ARG is 1, prompt for a group name to post to.
Depending on the selected group, the message might be either a mail or
a news."
  (interactive "P")
  ;; Bind this variable here to make message mode hooks work ok.
  (let ((gnus-newsgroup-name
	 (if arg
	     (if (= 1 (prefix-numeric-value arg))
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		 (gnus-group-completing-read "Newsgroup" nil
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					     (gnus-read-active-file-p))
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	       "")
	   gnus-newsgroup-name))
	;; make sure last viewed article doesn't affect posting styles:
	(gnus-article-copy))
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    (gnus-post-news 'post gnus-newsgroup-name)))


(defun gnus-summary-followup (yank &optional force-news)
  "Compose a followup to an article.
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If prefix argument YANK is non-nil, the original article is yanked
automatically.
YANK is a list of elements, where the car of each element is the
article number, and the cdr is the string to be yanked."
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  (interactive
   (list (and current-prefix-arg
	      (gnus-summary-work-articles 1))))
  (when yank
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    (gnus-summary-goto-subject
     (if (listp (car yank))
	 (caar yank)
       (car yank))))
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  (save-window-excursion
    (gnus-summary-select-article))
  (let ((headers (gnus-summary-article-header (gnus-summary-article-number)))
	(gnus-newsgroup-name gnus-newsgroup-name))
    ;; Send a followup.
    (gnus-post-news nil gnus-newsgroup-name
		    headers gnus-article-buffer
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		    yank nil force-news)
    (gnus-summary-handle-replysign)))
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(defun gnus-summary-followup-with-original (n &optional force-news)
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  "Compose a followup to an article and include the original article.
The text in the region will be yanked.  If the region isn't
active, the entire article will be yanked."
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  (interactive "P")
  (gnus-summary-followup (gnus-summary-work-articles n) force-news))

(defun gnus-summary-followup-to-mail (&optional arg)
  "Followup to the current mail message via news."
  (interactive
   (list (and current-prefix-arg
	      (gnus-summary-work-articles 1))))
  (gnus-summary-followup arg t))

(defun gnus-summary-followup-to-mail-with-original (&optional arg)
  "Followup to the current mail message via news."
  (interactive "P")
  (gnus-summary-followup (gnus-summary-work-articles arg) t))

(defun gnus-inews-yank-articles (articles)
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  (let (beg article yank-string)
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    (message-goto-body)
    (while (setq article (pop articles))
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      (when (listp article)
	(setq yank-string (nth 1 article)
	      article (nth 0 article)))
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      (save-window-excursion
	(set-buffer gnus-summary-buffer)
	(gnus-summary-select-article nil nil nil article)
	(gnus-summary-remove-process-mark article))
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      (gnus-copy-article-buffer nil yank-string)
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      (let ((message-reply-buffer gnus-article-copy)
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	    (message-reply-headers
	     ;; The headers are decoded.
	     (with-current-buffer gnus-article-copy
	       (save-restriction
		 (nnheader-narrow-to-headers)
		 (nnheader-parse-naked-head)))))
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	(message-yank-original)
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	(message-exchange-point-and-mark)
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	(setq beg (or beg (mark t))))
      (when articles
	(insert "\n")))
    (push-mark)
    (goto-char beg)))

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(defun gnus-summary-cancel-article (&optional n symp)
  "Cancel an article you posted.
Uses the process-prefix convention.  If given the symbolic
prefix `a', cancel using the standard posting method; if not
post using the current select method."
  (interactive (gnus-interactive "P\ny"))
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  (let ((message-post-method
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	 `(lambda (arg)
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	    (gnus-post-method (eq ',symp 'a) ,gnus-newsgroup-name)))
	(user-mail-address user-mail-address))
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    (dolist (article (gnus-summary-work-articles n))
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      (when (gnus-summary-select-article t nil nil article)
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	;; Pretend that we're doing a followup so that we can see what
	;; the From header would have ended up being.
	(save-window-excursion
	  (save-excursion
	    (gnus-summary-followup nil)
	    (let ((from (message-fetch-field "from")))
	      (when from
		(setq user-mail-address
		      (car (mail-header-parse-address from)))))
	    (kill-buffer (current-buffer))))
	;; Now cancel the article using the From header we got.
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	(when (gnus-eval-in-buffer-window gnus-original-article-buffer
		(message-cancel-news))
	  (gnus-summary-mark-as-read article gnus-canceled-mark)
	  (gnus-cache-remove-article 1))
	(gnus-article-hide-headers-if-wanted))
      (gnus-summary-remove-process-mark article))))

(defun gnus-summary-supersede-article ()
  "Compose an article that will supersede a previous article.
This is done simply by taking the old article and adding a Supersedes
header line with the old Message-ID."
  (interactive)
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  (let ((article (gnus-summary-article-number))
	(mail-parse-charset gnus-newsgroup-charset))
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    (gnus-setup-message 'reply-yank
      (gnus-summary-select-article t)
      (set-buffer gnus-original-article-buffer)
      (message-supersede)
      (push
       `((lambda ()
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	   (when (gnus-buffer-exists-p ,gnus-summary-buffer)
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	     (with-current-buffer ,gnus-summary-buffer
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	       (gnus-cache-possibly-remove-article ,article nil nil nil t)
	       (gnus-summary-mark-as-read ,article gnus-canceled-mark)))))
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       message-send-actions)
      ;; Add Gcc header.
      (gnus-inews-insert-gcc))))
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(defun gnus-copy-article-buffer (&optional article-buffer yank-string)
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  ;; 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.
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  (setq gnus-article-copy (gnus-get-buffer-create " *gnus article copy*"))
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  (with-current-buffer gnus-article-copy
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    (mm-enable-multibyte))
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  (let ((article-buffer (or article-buffer gnus-article-buffer))
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	end beg)
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    (if (not (and (get-buffer article-buffer)
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		  (gnus-buffer-exists-p article-buffer)))
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	(error "Can't find any article buffer")
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      (with-current-buffer article-buffer
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	(let ((gnus-newsgroup-charset (or gnus-article-charset
					  gnus-newsgroup-charset))
	      (gnus-newsgroup-ignored-charsets
	       (or gnus-article-ignored-charsets
		   gnus-newsgroup-ignored-charsets)))
	  (save-restriction
	    ;; Copy over the (displayed) article buffer, delete
	    ;; hidden text and remove text properties.
	    (widen)
	    (copy-to-buffer gnus-article-copy (point-min) (point-max))
	    (set-buffer gnus-article-copy)
	    (when yank-string
	      (message-goto-body)
	      (delete-region (point) (point-max))
	      (insert yank-string))
	    (gnus-article-delete-text-of-type 'annotation)
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	    (gnus-article-delete-text-of-type 'multipart)
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	    (gnus-remove-text-with-property 'gnus-prev)
	    (gnus-remove-text-with-property 'gnus-next)
	    (gnus-remove-text-with-property 'gnus-decoration)
	    (insert
	     (prog1
		 (buffer-substring-no-properties (point-min) (point-max))
	       (erase-buffer)))
	    ;; Find the original headers.
	    (set-buffer gnus-original-article-buffer)
	    (goto-char (point-min))
	    (while (looking-at message-unix-mail-delimiter)
	      (forward-line 1))
	    (let ((mail-header-separator ""))
	      (setq beg (point)
		    end (or (message-goto-body)
			    ;; There may be just a header.
			    (point-max))))
	    ;; Delete the headers from the displayed articles.
	    (set-buffer gnus-article-copy)
	    (let ((mail-header-separator ""))
	      (delete-region (goto-char (point-min))
			     (or (message-goto-body) (point-max))))
	    ;; Insert the original article headers.
	    (insert-buffer-substring gnus-original-article-buffer beg end)
	    ;; Decode charsets.
	    (let ((gnus-article-decode-hook
		   (delq 'article-decode-charset
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			 (copy-sequence gnus-article-decode-hook)))
		  (rfc2047-quote-decoded-words-containing-tspecials t))
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	      (run-hooks 'gnus-article-decode-hook)))))
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      gnus-article-copy)))

(defun gnus-post-news (post &optional group header article-buffer yank subject
			    force-news)
  (when article-buffer
    (gnus-copy-article-buffer))
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  (let ((gnus-article-reply (and article-buffer (gnus-summary-article-number)))
	(gnus-article-yanked-articles yank)
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	(add-to-list gnus-add-to-list))
    (gnus-setup-message (cond (yank 'reply-yank)
			      (article-buffer 'reply)
			      (t 'message))
      (let* ((group (or group gnus-newsgroup-name))
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	     (charset (gnus-group-name-charset nil group))
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	     (pgroup group)
	     to-address to-group mailing-list to-list
	     newsgroup-p)
	(when group
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	  (setq to-address (gnus-parameter-to-address group)
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		to-group (gnus-group-find-parameter group 'to-group)
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		to-list (gnus-parameter-to-list group)
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		newsgroup-p (gnus-group-find-parameter group 'newsgroup)
		mailing-list (when gnus-mailing-list-groups
			       (string-match gnus-mailing-list-groups group))
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		group (gnus-group-name-decode (gnus-group-real-name group)
					      charset)))
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	(if (or (and to-group
		     (gnus-news-group-p to-group))
		newsgroup-p
		force-news
		(and (gnus-news-group-p
		      (or pgroup gnus-newsgroup-name)
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		      (or header gnus-current-article))
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		     (not mailing-list)
		     (not to-list)
		     (not to-address)))
	    ;; This is news.
	    (if post
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		(message-news
		 (or to-group
		     (and (not (gnus-virtual-group-p pgroup)) group)))
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	      (set-buffer gnus-article-copy)
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	      (gnus-msg-treat-broken-reply-to)
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	      (message-followup (if (or newsgroup-p force-news)
				    (if (save-restriction
					  (article-narrow-to-head)
					  (message-fetch-field "newsgroups"))
					nil
				      "")
				  to-group)))
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	  ;; The is mail.
	  (if post
	      (progn
		(message-mail (or to-address to-list))
		;; Arrange for mail groups that have no `to-address' to
		;; get that when the user sends off the mail.
		(when (and (not to-list)
			   (not to-address)
			   add-to-list)
		  (push (list 'gnus-inews-add-to-address pgroup)
			message-send-actions)))
	    (set-buffer gnus-article-copy)
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	    (gnus-msg-treat-broken-reply-to)
	    (message-wide-reply to-address)))
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	(when yank
	  (gnus-inews-yank-articles yank))))))

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(defun gnus-msg-treat-broken-reply-to (&optional force)
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  "Remove the Reply-to header if broken-reply-to."
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  (when (or force
	    (gnus-group-find-parameter
	     gnus-newsgroup-name 'broken-reply-to))
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    (save-restriction
      (message-narrow-to-head)
      (message-remove-header "reply-to"))))

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(defun gnus-post-method (arg group &optional silent)
  "Return the posting method based on GROUP and ARG.
If SILENT, don't prompt the user."
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  (let ((gnus-post-method (or (gnus-parameter-post-method group)
			      gnus-post-method))
	(group-method (gnus-find-method-for-group group)))
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    (cond
     ;; If the group-method is nil (which shouldn't happen) we use
     ;; the default method.
     ((null group-method)
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      (or (and (listp gnus-post-method)	;If not current/native/nil
	       (not (listp (car gnus-post-method))) ; and not a list of methods
	       gnus-post-method)	;then use it.
	  gnus-select-method
	  message-post-method))
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     ;; We want the inverse of the default
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     ((and arg (not (eq arg 0)))
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      (if (eq gnus-post-method 'current)
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	  gnus-select-method
	group-method))
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     ;; We query the user for a post method.
     ((or arg
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	  (and (listp gnus-post-method)
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	       (listp (car gnus-post-method))))
      (let* ((methods
	      ;; Collect all methods we know about.
	      (append
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	       (when (listp gnus-post-method)
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		 (if (listp (car gnus-post-method))
		     gnus-post-method
		   (list gnus-post-method)))
	       gnus-secondary-select-methods
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	       (mapcar 'cdr gnus-server-alist)
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	       (mapcar 'car gnus-opened-servers)
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	       (list gnus-select-method)
	       (list group-method)))
	     method-alist post-methods method)
	;; Weed out all mail methods.
	(while methods
	  (setq method (gnus-server-get-method "" (pop methods)))
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	  (when (and (or (gnus-method-option-p method 'post)
			 (gnus-method-option-p method 'post-mail))
		     (not (member method post-methods)))
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	    (push method post-methods)))
	;; Create a name-method alist.
	(setq method-alist
	      (mapcar
	       (lambda (m)