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;;; gnus-art.el --- article mode commands for Gnus
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;; Copyright (C) 1996-2016 Free Software Foundation, Inc.
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;; Author: 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
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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;; 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
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  (require 'cl))
(defvar tool-bar-map)
(defvar w3m-minor-mode-map)
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(require 'gnus)
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(require 'gnus-sum)
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(require 'gnus-spec)
(require 'gnus-int)
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(require 'gnus-win)
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(require 'mm-bodies)
(require 'mail-parse)
(require 'mm-decode)
(require 'mm-view)
(require 'wid-edit)
(require 'mm-uu)
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(require 'message)
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(require 'mouse)
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(autoload 'gnus-msg-mail "gnus-msg" nil t)
(autoload 'gnus-button-mailto "gnus-msg")
(autoload 'gnus-button-reply "gnus-msg" nil t)
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(autoload 'parse-time-string "parse-time" nil nil)
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(autoload 'ansi-color-apply-on-region "ansi-color")
(autoload 'mm-url-insert-file-contents-external "mm-url")
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(autoload 'mm-extern-cache-contents "mm-extern")
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(autoload 'url-expand-file-name "url-expand")
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(defgroup gnus-article nil
  "Article display."
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  :link '(custom-manual "(gnus)Article Buffer")
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  :group 'gnus)

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(defgroup gnus-article-treat nil
  "Treating article parts."
  :link '(custom-manual "(gnus)Article Hiding")
  :group 'gnus-article)

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(defgroup gnus-article-hiding nil
  "Hiding article parts."
  :link '(custom-manual "(gnus)Article Hiding")
  :group 'gnus-article)

(defgroup gnus-article-highlight nil
  "Article highlighting."
  :link '(custom-manual "(gnus)Article Highlighting")
  :group 'gnus-article
  :group 'gnus-visual)

(defgroup gnus-article-signature nil
  "Article signatures."
  :link '(custom-manual "(gnus)Article Signature")
  :group 'gnus-article)

(defgroup gnus-article-headers nil
  "Article headers."
  :link '(custom-manual "(gnus)Hiding Headers")
  :group 'gnus-article)

(defgroup gnus-article-washing nil
  "Special commands on articles."
  :link '(custom-manual "(gnus)Article Washing")
  :group 'gnus-article)

(defgroup gnus-article-emphasis nil
  "Fontisizing articles."
  :link '(custom-manual "(gnus)Article Fontisizing")
  :group 'gnus-article)

(defgroup gnus-article-saving nil
  "Saving articles."
  :link '(custom-manual "(gnus)Saving Articles")
  :group 'gnus-article)

(defgroup gnus-article-mime nil
  "Worshiping the MIME wonder."
  :link '(custom-manual "(gnus)Using MIME")
  :group 'gnus-article)

(defgroup gnus-article-buttons nil
  "Pushable buttons in the article buffer."
  :link '(custom-manual "(gnus)Article Buttons")
  :group 'gnus-article)

(defgroup gnus-article-various nil
  "Other article options."
  :link '(custom-manual "(gnus)Misc Article")
  :group 'gnus-article)

(defcustom gnus-ignored-headers
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  (mapcar
   (lambda (header)
     (concat "^" header ":"))
   '("Path" "Expires" "Date-Received" "References" "Xref" "Lines"
     "Relay-Version" "Message-ID" "Approved" "Sender" "Received"
     "X-UIDL" "MIME-Version" "Return-Path" "In-Reply-To"
     "Content-Type" "Content-Transfer-Encoding" "X-WebTV-Signature"
     "X-MimeOLE" "X-MSMail-Priority" "X-Priority" "X-Loop"
     "X-Authentication-Warning" "X-MIME-Autoconverted" "X-Face"
     "X-Attribution" "X-Originating-IP" "Delivered-To"
     "NNTP-[-A-Za-z]+" "Distribution" "X-no-archive" "X-Trace"
     "X-Complaints-To" "X-NNTP-Posting-Host" "X-Orig.*"
     "Abuse-Reports-To" "Cache-Post-Path" "X-Article-Creation-Date"
     "X-Poster" "X-Mail2News-Path" "X-Server-Date" "X-Cache"
     "Originator" "X-Problems-To" "X-Auth-User" "X-Post-Time"
     "X-Admin" "X-UID" "Resent-[-A-Za-z]+" "X-Mailing-List"
     "Precedence" "Original-[-A-Za-z]+" "X-filename" "X-Orcpt"
     "Old-Received" "X-Pgp" "X-Auth" "X-From-Line"
     "X-Gnus-Article-Number" "X-Majordomo" "X-Url" "X-Sender"
     "MBOX-Line" "Priority" "X400-[-A-Za-z]+"
     "Status" "X-Gnus-Mail-Source" "Cancel-Lock"
     "X-FTN" "X-EXP32-SerialNo" "Encoding" "Importance"
     "Autoforwarded" "Original-Encoded-Information-Types" "X-Ya-Pop3"
     "X-Face-Version" "X-Vms-To" "X-ML-NAME" "X-ML-COUNT"
     "Mailing-List" "X-finfo" "X-md5sum" "X-md5sum-Origin"
     "X-Sun-Charset" "X-Accept-Language" "X-Envelope-Sender"
     "List-[A-Za-z]+" "X-Listprocessor-Version"
     "X-Received" "X-Distribute" "X-Sequence" "X-Juno-Line-Breaks"
     "X-Notes-Item" "X-MS-TNEF-Correlator" "x-uunet-gateway"
     "X-Received" "Content-length" "X-precedence"
     "X-Authenticated-User" "X-Comment" "X-Report" "X-Abuse-Info"
     "X-HTTP-Proxy" "X-Mydeja-Info" "X-Copyright" "X-No-Markup"
     "X-Abuse-Info" "X-From_" "X-Accept-Language" "Errors-To"
     "X-BeenThere" "X-Mailman-Version" "List-Help" "List-Post"
     "List-Subscribe" "List-Id" "List-Unsubscribe" "List-Archive"
     "X-Content-length" "X-Posting-Agent" "Original-Received"
     "X-Request-PGP" "X-Fingerprint" "X-WRIEnvto" "X-WRIEnvfrom"
     "X-Virus-Scanned" "X-Delivery-Agent" "Posted-Date" "X-Gateway"
     "X-Local-Origin" "X-Local-Destination" "X-UserInfo1"
     "X-Received-Date" "X-Hashcash" "Face" "X-DMCA-Notifications"
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     "X-Abuse-and-DMCA-Info" "X-Postfilter" "X-Gpg-.*" "X-Disclaimer"
     "Envelope-To" "X-Spam-Score" "System-Type" "X-Injected-Via-Gmane"
     "X-Gmane-NNTP-Posting-Host" "Jabber-ID" "Archived-At"
     "Envelope-Sender" "Envelope-Recipients"))
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  "*All headers that start with this regexp will be hidden.
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This variable can also be a list of regexps of headers to be ignored.
If `gnus-visible-headers' is non-nil, this variable will be ignored."
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  :type '(choice regexp
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		 (repeat regexp))
  :group 'gnus-article-hiding)

(defcustom gnus-visible-headers
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  "^From:\\|^Newsgroups:\\|^Subject:\\|^Date:\\|^Followup-To:\\|^Reply-To:\\|^Organization:\\|^Summary:\\|^Keywords:\\|^To:\\|^[BGF]?Cc:\\|^Posted-To:\\|^Mail-Copies-To:\\|^Mail-Followup-To:\\|^Apparently-To:\\|^Gnus-Warning:\\|^Resent-From:"
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  "*All headers that do not match this regexp will be hidden.
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This variable can also be a list of regexp of headers to remain visible.
If this variable is non-nil, `gnus-ignored-headers' will be ignored."
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  :type '(choice
	  (repeat :value-to-internal (lambda (widget value)
				       (custom-split-regexp-maybe value))
		  :match (lambda (widget value)
			   (or (stringp value)
			       (widget-editable-list-match widget value)))
		  regexp)
	  (const :tag "Use gnus-ignored-headers" nil)
	  regexp)
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  :group 'gnus-article-hiding)

(defcustom gnus-sorted-header-list
  '("^From:" "^Subject:" "^Summary:" "^Keywords:" "^Newsgroups:"
    "^Followup-To:" "^To:" "^Cc:" "^Date:" "^Organization:")
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  "*This variable is a list of regular expressions.
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If it is non-nil, headers that match the regular expressions will
be placed first in the article buffer in the sequence specified by
this list."
  :type '(repeat regexp)
  :group 'gnus-article-hiding)

(defcustom gnus-boring-article-headers '(empty followup-to reply-to)
  "Headers that are only to be displayed if they have interesting data.
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Possible values in this list are:

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  `empty'       Headers with no content.
  `newsgroups'  Newsgroup identical to Gnus group.
  `to-address'  To identical to To-address.
  `to-list'     To identical to To-list.
  `cc-list'     CC identical to To-list.
  `followup-to' Followup-to identical to Newsgroups.
  `reply-to'    Reply-to identical to From.
  `date'        Date less than four days old.
  `long-to'     To and/or Cc longer than 1024 characters.
  `many-to'     Multiple To and/or Cc."
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  :type '(set (const :tag "Headers with no content." empty)
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	      (const :tag "Newsgroups identical to Gnus group." newsgroups)
	      (const :tag "To identical to To-address." to-address)
	      (const :tag "To identical to To-list." to-list)
	      (const :tag "CC identical to To-list." cc-list)
	      (const :tag "Followup-to identical to Newsgroups." followup-to)
	      (const :tag "Reply-to identical to From." reply-to)
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	      (const :tag "Date less than four days old." date)
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	      (const :tag "To and/or Cc longer than 1024 characters." long-to)
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	      (const :tag "Multiple To and/or Cc headers." many-to))
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  :group 'gnus-article-hiding)

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(defcustom gnus-article-skip-boring nil
  "Skip over text that is not worth reading.
By default, if you set this t, then Gnus will display citations and
signatures, but will never scroll down to show you a page consisting
only of boring text.  Boring text is controlled by
`gnus-article-boring-faces'."
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  :version "22.1"
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  :type 'boolean
  :group 'gnus-article-hiding)

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(defcustom gnus-signature-separator '("^-- $" "^-- *$")
  "Regexp matching signature separator.
This can also be a list of regexps.  In that case, it will be checked
from head to tail looking for a separator.  Searches will be done from
the end of the buffer."
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  :type '(choice :format "%{%t%}: %[Value Menu%]\n%v"
		 (regexp)
		 (repeat :tag "List of regexp" regexp))
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  :group 'gnus-article-signature)

(defcustom gnus-signature-limit nil
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  "Provide a limit to what is considered a signature.
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If it is a number, no signature may not be longer (in characters) than
that number.  If it is a floating point number, no signature may be
longer (in lines) than that number.  If it is a function, the function
will be called without any parameters, and if it returns nil, there is
no signature in the buffer.  If it is a string, it will be used as a
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regexp.  If it matches, the text in question is not a signature.

This can also be a list of the above values."
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  :type '(choice (const nil)
		 (integer :value 200)
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		 (number :value 4.0)
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		 function
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		 (regexp :value ".*"))
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  :group 'gnus-article-signature)

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(defcustom gnus-hidden-properties
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  ;; We use to have `intangible' here as well, but Emacs's command loop moves
  ;; point out of invisible text anyway, so `intangible' is clearly not
  ;; needed there.  And XEmacs doesn't handle `intangible' anyway.
  '(invisible t)
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  "Property list to use for hiding text."
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  :type 'plist
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  :group 'gnus-article-hiding)

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;; Fixme: This isn't the right thing for mixed graphical and non-graphical
;; frames in a session.
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(defcustom gnus-article-x-face-command
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  (if (featurep 'xemacs)
      (if (or (gnus-image-type-available-p 'xface)
	      (gnus-image-type-available-p 'pbm))
	  'gnus-display-x-face-in-from
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	"{ echo \
'/* Format_version=1, Width=48, Height=48, Depth=1, Valid_bits_per_item=16 */'\
; uncompface; } | icontopbm | ee -")
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    (if (gnus-image-type-available-p 'pbm)
	'gnus-display-x-face-in-from
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      "{ echo \
'/* Format_version=1, Width=48, Height=48, Depth=1, Valid_bits_per_item=16 */'\
; uncompface; } | icontopbm | display -"))
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  "*String or function to be executed to display an X-Face header.
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If it is a string, the command will be executed in a sub-shell
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asynchronously.  The compressed face will be piped to this command."
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  :type `(choice string
		 (function-item gnus-display-x-face-in-from)
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		 function)
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  :version "21.1"
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  :group 'gnus-picon
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  :group 'gnus-article-washing)

(defcustom gnus-article-x-face-too-ugly nil
  "Regexp matching posters whose face shouldn't be shown automatically."
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  :type '(choice regexp (const nil))
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  :group 'gnus-article-washing)

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(defcustom gnus-article-banner-alist nil
  "Banner alist for stripping.
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For example,
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     ((egroups . \"^[ \\t\\n]*-------------------+\\\\( \\\\(e\\\\|Yahoo! \\\\)Groups Sponsor -+\\\\)?....\\n\\\\(.+\\n\\\\)+\"))"
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  :version "21.1"
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  :type '(repeat (cons symbol regexp))
  :group 'gnus-article-washing)

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(gnus-define-group-parameter
 banner
 :variable-document
 "Alist of regexps (to match group names) and banner."
 :variable-group gnus-article-washing
 :parameter-type
 '(choice :tag "Banner"
	  :value nil
	  (const :tag "Remove signature" signature)
	  (symbol :tag "Item in `gnus-article-banner-alist'" none)
	  regexp
	  (const :tag "None" nil))
 :parameter-document
 "If non-nil, specify how to remove `banners' from articles.

Symbol `signature' means to remove signatures delimited by
`gnus-signature-separator'.  Any other symbol is used to look up a
regular expression to match the banner in `gnus-article-banner-alist'.
A string is used as a regular expression to match the banner
directly.")

(defcustom gnus-article-address-banner-alist nil
  "Alist of mail addresses and banners.
Each element has the form (ADDRESS . BANNER), where ADDRESS is a regexp
to match a mail address in the From: header, BANNER is one of a symbol
`signature', an item in `gnus-article-banner-alist', a regexp and nil.
If ADDRESS matches author's mail address, it will remove things like
advertisements.  For example:

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\((\"@yoo-hoo\\\\.co\\\\.jp\\\\\\='\" . \"\\n_+\\nDo You Yoo-hoo!\\\\?\\n.*\\n.*\\n\"))
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"
  :type '(repeat
	  (cons
	   (regexp :tag "Address")
	   (choice :tag "Banner" :value nil
		   (const :tag "Remove signature" signature)
		   (symbol :tag "Item in `gnus-article-banner-alist'" none)
		   regexp
		   (const :tag "None" nil))))
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  :version "22.1"
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  :group 'gnus-article-washing)

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(defmacro gnus-emphasis-custom-with-format (&rest body)
  `(let ((format "\
\\(\\s-\\|^\\|\\=\\|[-\"]\\|\\s(\\)\\(%s\\(\\w+\\(\\s-+\\w+\\)*[.,]?\\)%s\\)\
\\(\\([-,.;:!?\"]\\|\\s)\\)+\\s-\\|[?!.]\\s-\\|\\s)\\|\\s-\\)"))
     ,@body))

(defun gnus-emphasis-custom-value-to-external (value)
  (gnus-emphasis-custom-with-format
   (if (consp (car value))
       (list (format format (car (car value)) (cdr (car value)))
	     2
	     (if (nth 1 value) 2 3)
	     (nth 2 value))
     value)))

(defun gnus-emphasis-custom-value-to-internal (value)
  (gnus-emphasis-custom-with-format
   (let ((regexp (concat "\\`"
			 (format (regexp-quote format)
				 "\\([^()]+\\)" "\\([^()]+\\)")
			 "\\'"))
	 pattern)
     (if (string-match regexp (setq pattern (car value)))
	 (list (cons (match-string 1 pattern) (match-string 2 pattern))
	       (= (nth 2 value) 2)
	       (nth 3 value))
       value))))

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(defcustom gnus-emphasis-alist
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  (let ((types
	 '(("\\*" "\\*" bold nil 2)
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	   ("_" "_" underline)
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	   ("/" "/" italic)
	   ("_/" "/_" underline-italic)
	   ("_\\*" "\\*_" underline-bold)
	   ("\\*/" "/\\*" bold-italic)
	   ("_\\*/" "/\\*_" underline-bold-italic))))
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    (nconc
     (gnus-emphasis-custom-with-format
      (mapcar (lambda (spec)
		(list (format format (car spec) (cadr spec))
		      (or (nth 3 spec) 2)
		      (or (nth 4 spec) 3)
		      (intern (format "gnus-emphasis-%s" (nth 2 spec)))))
	      types))
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     '(;; I've never seen anyone use this strikethru convention whereas I've
       ;; several times seen it triggered by normal text.  --Stef
       ;; Miles suggests that this form is sometimes used but for italics,
       ;; so maybe we should map it to `italic'.
       ;; ("\\(\\s-\\|^\\)\\(-\\(\\(\\w\\|-[^-]\\)+\\)-\\)\\(\\s-\\|[?!.,;]\\)"
       ;; 2 3 gnus-emphasis-strikethru)
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       ("\\(\\s-\\|^\\)\\(_\\(\\(\\w\\|_[^_]\\)+\\)_\\)\\(\\s-\\|[?!.,;]\\)"
	2 3 gnus-emphasis-underline))))
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  "*Alist that says how to fontify certain phrases.
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Each item looks like this:

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  (\"_\\\\(\\\\w+\\\\)_\" 0 1 \\='underline)
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The first element is a regular expression to be matched.  The second
is a number that says what regular expression grouping used to find
the entire emphasized word.  The third is a number that says what
regexp grouping should be displayed and highlighted.  The fourth
is the face used for highlighting."
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  :type
  '(repeat
    (menu-choice
     :format "%[Customizing Style%]\n%v"
     :indent 2
     (group :tag "Default"
	    :value ("" 0 0 default)
	    :value-create
	    (lambda (widget)
	      (let ((value (widget-get
			    (cadr (widget-get (widget-get widget :parent)
					      :args))
			    :value)))
		(if (not (eq (nth 2 value) 'default))
		    (widget-put
		     widget
		     :value
		     (gnus-emphasis-custom-value-to-external value))))
	      (widget-group-value-create widget))
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	    regexp
	    (integer :format "Match group: %v")
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	    (integer :format "Emphasize group: %v")
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	    face)
     (group :tag "Simple"
	    :value (("_" . "_") nil default)
	    (cons :format "%v"
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		  (regexp :format "Start regexp: %v")
		  (regexp :format "End regexp: %v"))
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	    (boolean :format "Show start and end patterns: %[%v%]\n"
		     :on " On " :off " Off ")
	    face)))
  :get (lambda (symbol)
	 (mapcar 'gnus-emphasis-custom-value-to-internal
		 (default-value symbol)))
  :set (lambda (symbol value)
	 (set-default symbol (mapcar 'gnus-emphasis-custom-value-to-external
				     value)))
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  :group 'gnus-article-emphasis)

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(defcustom gnus-emphasize-whitespace-regexp "^[ \t]+\\|[ \t]*\n"
  "A regexp to describe whitespace which should not be emphasized.
Typical values are \"^[ \\t]+\\\\|[ \\t]*\\n\" and \"[ \\t]+\\\\|[ \\t]*\\n\".
The former avoids underlining of leading and trailing whitespace,
and the latter avoids underlining any whitespace at all."
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  :version "21.1"
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  :group 'gnus-article-emphasis
  :type 'regexp)

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(defface gnus-emphasis-bold '((t (:bold t)))
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  "Face used for displaying strong emphasized text (*word*)."
  :group 'gnus-article-emphasis)

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(defface gnus-emphasis-italic '((t (:italic t)))
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  "Face used for displaying italic emphasized text (/word/)."
  :group 'gnus-article-emphasis)

(defface gnus-emphasis-underline '((t (:underline t)))
  "Face used for displaying underlined emphasized text (_word_)."
  :group 'gnus-article-emphasis)

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(defface gnus-emphasis-underline-bold '((t (:bold t :underline t)))
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  "Face used for displaying underlined bold emphasized text (_*word*_)."
  :group 'gnus-article-emphasis)

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(defface gnus-emphasis-underline-italic '((t (:italic t :underline t)))
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  "Face used for displaying underlined italic emphasized text (_/word/_)."
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  :group 'gnus-article-emphasis)

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(defface gnus-emphasis-bold-italic '((t (:bold t :italic t)))
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  "Face used for displaying bold italic emphasized text (/*word*/)."
  :group 'gnus-article-emphasis)

(defface gnus-emphasis-underline-bold-italic
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  '((t (:bold t :italic t :underline t)))
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  "Face used for displaying underlined bold italic emphasized text.
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Typos.  
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Example: (_/*word*/_)."
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  :group 'gnus-article-emphasis)

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(defface gnus-emphasis-strikethru (if (featurep 'xemacs)
				      '((t (:strikethru t)))
				    '((t (:strike-through t))))
  "Face used for displaying strike-through text (-word-)."
  :group 'gnus-article-emphasis)

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(defface gnus-emphasis-highlight-words
  '((t (:background "black" :foreground "yellow")))
  "Face used for displaying highlighted words."
  :group 'gnus-article-emphasis)

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(defcustom gnus-article-time-format "%a, %d %b %Y %T %Z"
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  "Format for display of Date headers in article bodies.
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See `format-time-string' for the possible values.

The variable can also be function, which should return a complete Date
header.  The function is called with one argument, the time, which can
be fed to `format-time-string'."
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  :type '(choice string function)
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  :link '(custom-manual "(gnus)Article Date")
  :group 'gnus-article-washing)

(defcustom gnus-save-all-headers t
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  "*If non-nil, don't remove any headers before saving.
This will be overridden by the `:headers' property that the symbol of
the saver function, which is specified by `gnus-default-article-saver',
might have."
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  :group 'gnus-article-saving
  :type 'boolean)

(defcustom gnus-prompt-before-saving 'always
  "*This variable says how much prompting is to be done when saving articles.
If it is nil, no prompting will be done, and the articles will be
saved to the default files.  If this variable is `always', each and
every article that is saved will be preceded by a prompt, even when
saving large batches of articles.  If this variable is neither nil not
`always', there the user will be prompted once for a file name for
each invocation of the saving commands."
  :group 'gnus-article-saving
  :type '(choice (item always)
		 (item :tag "never" nil)
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		 (sexp :tag "once" :format "%t\n" :value t)))
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(defcustom gnus-saved-headers gnus-visible-headers
  "Headers to keep if `gnus-save-all-headers' is nil.
If `gnus-save-all-headers' is non-nil, this variable will be ignored.
If that variable is nil, however, all headers that match this regexp
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will be kept while the rest will be deleted before saving.  This and
`gnus-save-all-headers' will be overridden by the `:headers' property
that the symbol of the saver function, which is specified by
`gnus-default-article-saver', might have."
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  :group 'gnus-article-saving
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  :type 'regexp)
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;; Note that "Rmail format" is mbox since Emacs 23, but Babyl before.
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(defcustom gnus-default-article-saver 'gnus-summary-save-in-rmail
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  "A function to save articles in your favorite format.
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The function will be called by way of the `gnus-summary-save-article'
command, and friends such as `gnus-summary-save-article-rmail'.
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Gnus provides the following functions:

* gnus-summary-save-in-rmail (Rmail format)
* gnus-summary-save-in-mail (Unix mail format)
* gnus-summary-save-in-folder (MH folder)
* gnus-summary-save-in-file (article format)
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* gnus-summary-save-body-in-file (article body)
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* gnus-summary-save-in-vm (use VM's folder format)
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* gnus-summary-write-to-file (article format -- overwrite)
* gnus-summary-write-body-to-file (article body -- overwrite)
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* gnus-summary-save-in-pipe (article format)
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The symbol of each function may have the following properties:

* :decode
The value non-nil means save decoded articles.  This is meaningful
only with `gnus-summary-save-in-file', `gnus-summary-save-body-in-file',
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`gnus-summary-write-to-file', `gnus-summary-write-body-to-file', and
`gnus-summary-save-in-pipe'.
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* :function
The value specifies an alternative function which appends, not
overwrites, articles to a file.  This implies that when saving many
articles at a time, `gnus-prompt-before-saving' is bound to t and all
articles are saved in a single file.  This is meaningful only with
`gnus-summary-write-to-file' and `gnus-summary-write-body-to-file'.

* :headers
The value specifies the symbol of a variable of which the value
specifies headers to be saved.  If it is omitted,
`gnus-save-all-headers' and `gnus-saved-headers' control what
headers should be saved."
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  :group 'gnus-article-saving
  :type '(radio (function-item gnus-summary-save-in-rmail)
		(function-item gnus-summary-save-in-mail)
		(function-item gnus-summary-save-in-folder)
		(function-item gnus-summary-save-in-file)
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		(function-item gnus-summary-save-body-in-file)
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		(function-item gnus-summary-save-in-vm)
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		(function-item gnus-summary-write-to-file)
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		(function-item gnus-summary-write-body-to-file)
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		(function-item gnus-summary-save-in-pipe)
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		(function)))
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(defcustom gnus-article-save-coding-system
  (or (and (mm-coding-system-p 'utf-8) 'utf-8)
      (and (mm-coding-system-p 'iso-2022-7bit) 'iso-2022-7bit)
      (and (mm-coding-system-p 'emacs-mule) 'emacs-mule)
      (and (mm-coding-system-p 'escape-quoted) 'escape-quoted))
  "Coding system used to save decoded articles to a file.

The recommended coding systems are `utf-8', `iso-2022-7bit' and so on,
which can safely encode any characters in text.  This is used by the
commands including:

* gnus-summary-save-article-file
* gnus-summary-save-article-body-file
* gnus-summary-write-article-file
* gnus-summary-write-article-body-file

and the functions to which you may set `gnus-default-article-saver':

* gnus-summary-save-in-file
* gnus-summary-save-body-in-file
* gnus-summary-write-to-file
* gnus-summary-write-body-to-file

Those commands and functions save just text displayed in the article
buffer to a file if the value of this variable is non-nil.  Note that
buttonized MIME parts will be lost in a saved file in that case.
Otherwise, raw articles will be saved."
  :group 'gnus-article-saving
  :type `(choice
	  :format "%{%t%}:\n %[Value Menu%] %v"
	  (const :tag "Save raw articles" nil)
	  ,@(delq nil
		  (mapcar
		   (lambda (arg) (if (mm-coding-system-p (nth 3 arg)) arg))
		   '((const :tag "UTF-8" utf-8)
		     (const :tag "iso-2022-7bit" iso-2022-7bit)
		     (const :tag "Emacs internal" emacs-mule)
		     (const :tag "escape-quoted" escape-quoted))))
	  (symbol :tag "Coding system")))

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(defcustom gnus-rmail-save-name 'gnus-plain-save-name
  "A function generating a file name to save articles in Rmail format.
The function is called with NEWSGROUP, HEADERS, and optional LAST-FILE."
  :group 'gnus-article-saving
  :type 'function)

(defcustom gnus-mail-save-name 'gnus-plain-save-name
  "A function generating a file name to save articles in Unix mail format.
The function is called with NEWSGROUP, HEADERS, and optional LAST-FILE."
  :group 'gnus-article-saving
  :type 'function)

(defcustom gnus-folder-save-name 'gnus-folder-save-name
  "A function generating a file name to save articles in MH folder.
The function is called with NEWSGROUP, HEADERS, and optional LAST-FOLDER."
  :group 'gnus-article-saving
  :type 'function)

(defcustom gnus-file-save-name 'gnus-numeric-save-name
  "A function generating a file name to save articles in article format.
The function is called with NEWSGROUP, HEADERS, and optional
LAST-FILE."
  :group 'gnus-article-saving
  :type 'function)

(defcustom gnus-split-methods
  '((gnus-article-archive-name)
    (gnus-article-nndoc-name))
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  "*Variable used to suggest where articles are to be saved.
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For instance, if you would like to save articles related to Gnus in
the file \"gnus-stuff\", and articles related to VM in \"vm-stuff\",
you could set this variable to something like:

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  ((\"^Subject:.*gnus\\|^Newsgroups:.*gnus\" \"gnus-stuff\")
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   (\"^Subject:.*vm\\|^Xref:.*vm\" \"vm-stuff\"))

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This variable is an alist where the key is the match and the
value is a list of possible files to save in if the match is
non-nil.
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If the match is a string, it is used as a regexp match on the
article.  If the match is a symbol, that symbol will be funcalled
from the buffer of the article to be saved with the newsgroup as the
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parameter.  If it is a list, it will be evalled in the same buffer.
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If this form or function returns a string, this string will be used as a
possible file name; and if it returns a non-nil list, that list will be
used as possible file names."
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  :group 'gnus-article-saving
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  :type '(repeat (choice (list :value (fun) function)
			 (cons :value ("" "") regexp (repeat string))
			 (sexp :value nil))))
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(defcustom gnus-page-delimiter "^\^L"
  "*Regexp describing what to use as article page delimiters.
The default value is \"^\^L\", which is a form linefeed at the
beginning of a line."
  :type 'regexp
  :group 'gnus-article-various)

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(defcustom gnus-article-mode-line-format "Gnus: %g %S%m"
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  "*The format specification for the article mode line.
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See `gnus-summary-mode-line-format' for a closer description.

The following additional specs are available:

%w  The article washing status.
%m  The number of MIME parts in the article."
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  :version "24.1"
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  :type 'string
  :group 'gnus-article-various)

(defcustom gnus-article-mode-hook nil
  "*A hook for Gnus article mode."
  :type 'hook
  :group 'gnus-article-various)

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(when (featurep 'xemacs)
  ;; Extracted from gnus-xmas-define in order to preserve user settings
  (when (fboundp 'turn-off-scroll-in-place)
    (add-hook 'gnus-article-mode-hook 'turn-off-scroll-in-place))
  ;; Extracted from gnus-xmas-redefine in order to preserve user settings
  (add-hook 'gnus-article-mode-hook 'gnus-xmas-article-menu-add))

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(defcustom gnus-article-menu-hook nil
  "*Hook run after the creation of the article mode menu."
  :type 'hook
  :group 'gnus-article-various)

(defcustom gnus-article-prepare-hook nil
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  "*A hook called after an article has been prepared in the article buffer."
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  :type 'hook
  :group 'gnus-article-various)

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(defcustom gnus-copy-article-ignored-headers nil
  "List of headers to be removed when copying an article.
Each element is a regular expression."
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  :version "23.1" ;; No Gnus
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  :type '(repeat regexp)
  :group 'gnus-article-various)

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(make-obsolete-variable 'gnus-article-hide-pgp-hook nil
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			"Gnus 5.10 (Emacs 22.1)")
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(defface gnus-button
  '((t (:weight bold)))
  "Face used for highlighting a button in the article buffer."
  :group 'gnus-article-buttons)

(defcustom gnus-article-button-face 'gnus-button
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  "Face used for highlighting buttons in the article buffer.

An article button is a piece of text that you can activate by pressing
`RET' or `mouse-2' above it."
  :type 'face
  :group 'gnus-article-buttons)

(defcustom gnus-article-mouse-face 'highlight
  "Face used for mouse highlighting in the article buffer.

Article buttons will be displayed in this face when the cursor is
above them."
  :type 'face
  :group 'gnus-article-buttons)

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(defcustom gnus-signature-face 'gnus-signature
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  "Face used for highlighting a signature in the article buffer.
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Obsolete; use the face `gnus-signature' for customizations instead."
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  :type 'face
  :group 'gnus-article-highlight
  :group 'gnus-article-signature)

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(defface gnus-signature
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  '((t
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     (:italic t)))
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  "Face used for highlighting a signature in the article buffer."
  :group 'gnus-article-highlight
  :group 'gnus-article-signature)
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;; backward-compatibility alias
(put 'gnus-signature-face 'face-alias 'gnus-signature)
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(put 'gnus-signature-face 'obsolete-face "22.1")
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(defface gnus-header-from
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  '((((class color)
      (background dark))
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     (:foreground "PaleGreen1"))
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    (((class color)
      (background light))
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     (:foreground "red3"))
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    (t
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     (:italic t)))
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  "Face used for displaying from headers."
  :group 'gnus-article-headers
  :group 'gnus-article-highlight)
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;; backward-compatibility alias
(put 'gnus-header-from-face 'face-alias 'gnus-header-from)
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(put 'gnus-header-from-face 'obsolete-face "22.1")
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(defface gnus-header-subject
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  '((((class color)
      (background dark))
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     (:foreground "SeaGreen1"))
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    (((class color)
      (background light))
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     (:foreground "red4"))
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    (t
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     (:bold t :italic t)))
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  "Face used for displaying subject headers."
  :group 'gnus-article-headers
  :group 'gnus-article-highlight)
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;; backward-compatibility alias
(put 'gnus-header-subject-face 'face-alias 'gnus-header-subject)
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(put 'gnus-header-subject-face 'obsolete-face "22.1")
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(defface gnus-header-newsgroups
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  '((((class color)
      (background dark))
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     (:foreground "yellow" :italic t))
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    (((class color)
      (background light))
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     (:foreground "MidnightBlue" :italic t))
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    (t
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     (:italic t)))
  "Face used for displaying newsgroups headers.
In the default setup this face is only used for crossposted
articles."
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  :group 'gnus-article-headers
  :group 'gnus-article-highlight)
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;; backward-compatibility alias
(put 'gnus-header-newsgroups-face 'face-alias 'gnus-header-newsgroups)
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(put 'gnus-header-newsgroups-face 'obsolete-face "22.1")
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(defface gnus-header-name
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  '((((class color)
      (background dark))
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     (:foreground "SpringGreen2"))
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    (((class color)
      (background light))
     (:foreground "maroon"))
    (t
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     (:bold t)))
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  "Face used for displaying header names."
  :group 'gnus-article-headers
  :group 'gnus-article-highlight)
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;; backward-compatibility alias
(put 'gnus-header-name-face 'face-alias 'gnus-header-name)
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(put 'gnus-header-name-face 'obsolete-face "22.1")
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(defface gnus-header-content
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  '((((class color)
      (background dark))
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     (:foreground "SpringGreen1" :italic t))
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    (((class color)
      (background light))
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     (:foreground "indianred4" :italic t))
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    (t
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     (:italic t)))  "Face used for displaying header content."
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  :group 'gnus-article-headers
  :group 'gnus-article-highlight)
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;; backward-compatibility alias
(put 'gnus-header-content-face 'face-alias 'gnus-header-content)
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(put 'gnus-header-content-face 'obsolete-face "22.1")
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(defcustom gnus-header-face-alist
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  '(("From" nil gnus-header-from)
    ("Subject" nil gnus-header-subject)
    ("Newsgroups:.*," nil gnus-header-newsgroups)
    ("" gnus-header-name gnus-header-content))
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  "*Controls highlighting of article headers.
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An alist of the form (HEADER NAME CONTENT).

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HEADER is a regular expression which should match the name of a
header and NAME and CONTENT are either face names or nil.
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The name of each header field will be displayed using the face
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specified by the first element in the list where HEADER matches
the header name and NAME is non-nil.  Similarly, the content will
be displayed by the first non-nil matching CONTENT face."
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  :group 'gnus-article-headers
  :group 'gnus-article-highlight
  :type '(repeat (list (regexp :tag "Header")
		       (choice :tag "Name"
			       (item :tag "skip" nil)
			       (face :value default))
		       (choice :tag "Content"
			       (item :tag "skip" nil)
			       (face :value default)))))

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(defcustom gnus-face-properties-alist (if (featurep 'xemacs)
					  '((xface . (:face gnus-x-face)))
					'((pbm . (:face gnus-x-face))
					  (png . nil)))
  "Alist of image types and properties applied to Face and X-Face images.
Here are examples:

;; Specify the altitude of Face images in the From header.
\(setq gnus-face-properties-alist
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      \\='((pbm . (:face gnus-x-face :ascent 80))
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	(png . (:ascent 80))))

;; Show Face images as pressed buttons.
\(setq gnus-face-properties-alist
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      \\='((pbm . (:face gnus-x-face :relief -2))
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	(png . (:relief -2))))

See the manual for the valid properties for various image types.
Currently, `pbm' is used for X-Face images and `png' is used for Face
images in Emacs.  Only the `:face' property is effective on the `xface'
image type in XEmacs if it is built with the libcompface library."
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  :version "23.1" ;; No Gnus
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  :group 'gnus-article-headers
  :type '(repeat (cons :format "%v" (symbol :tag "Image type") plist)))

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(defcustom gnus-article-decode-hook
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  '(article-decode-charset article-decode-encoded-words
			   article-decode-group-name article-decode-idna-rhs)
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  "*Hook run to decode charsets in articles."
  :group 'gnus-article-headers
  :type 'hook)

(defcustom gnus-display-mime-function 'gnus-display-mime
  "Function to display MIME articles."
  :group 'gnus-article-mime
  :type 'function)

(defvar gnus-decode-header-function 'mail-decode-encoded-word-region
  "Function used to decode headers.")

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(defvar gnus-decode-address-function 'mail-decode-encoded-address-region
  "Function used to decode addresses.")

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(defvar gnus-article-dumbquotes-map
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  '((?\200 "EUR")
    (?\202 ",")
    (?\203 "f")
    (?\204 ",,")
    (?\205 "...")
    (?\213 "<")
    (?\214 "OE")
    (?\221 "`")
    (?\222 "'")
    (?\223 "``")
    (?\224 "\"")
    (?\225 "*")
    (?\226 "-")
    (?\227 "--")
    (?\230 "~")
    (?\231 "(TM)")
    (?\233 ">")
    (?\234 "oe")
    (?\264 "'"))
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  "Table for MS-to-Latin1 translation.")

(defcustom gnus-ignored-mime-types nil
  "List of MIME types that should be ignored by Gnus."
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  :version "21.1"
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  :group 'gnus-article-mime
  :type '(repeat regexp))

(defcustom gnus-unbuttonized-mime-types '(".*/.*")
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  "List of MIME types that should not be given buttons when rendered inline.
See also `gnus-buttonized-mime-types' which may override this variable.
This variable is only used when `gnus-inhibit-mime-unbuttonizing' is nil."
  :version "21.1"
  :group 'gnus-article-mime
  :type '(repeat regexp))

(defcustom gnus-buttonized-mime-types nil
  "List of MIME types that should be given buttons when rendered inline.
If set, this variable overrides `gnus-unbuttonized-mime-types'.
To see e.g. security buttons you could set this to
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`(\"multipart/signed\")'.  You could also add \"multipart/alternative\" to
this list to display radio buttons that allow you to choose one of two
media types those mails include.  See also `mm-discouraged-alternatives'.
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This variable is only used when `gnus-inhibit-mime-unbuttonizing' is nil."
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  :version "22.1"
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  :group 'gnus-article-mime
  :type '(repeat regexp))

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(defcustom gnus-inhibit-mime-unbuttonizing nil
  "If non-nil, all MIME parts get buttons.
When nil (the default value), then some MIME parts do not get buttons,
as described by the variables `gnus-buttonized-mime-types' and
`gnus-unbuttonized-mime-types'."
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  :version "22.1"
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  :group 'gnus-article-mime
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  :type 'boolean)

(defcustom gnus-body-boundary-delimiter "_"
  "String used to delimit header and body.
This variable is used by `gnus-article-treat-body-boundary' which can
be controlled by `gnus-treat-body-boundary'."
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  :version "22.1"
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  :group 'gnus-article-various
  :type '(choice (item :tag "None" :value nil)
		 string))

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(defcustom gnus-picon-databases '("/usr/lib/picon" "/usr/local/faces"
				  "/usr/share/picons")
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  "Defines the location of the faces database.
For information on obtaining this database of pretty pictures, please
see http://www.cs.indiana.edu/picons/ftp/index.html"
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  :version "22.1"
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  :type '(repeat directory)
  :link '(url-link :tag "download"
		   "http://www.cs.indiana.edu/picons/ftp/index.html")
  :link '(custom-manual "(gnus)Picons")
  :group 'gnus-picon)

(defun gnus-picons-installed-p ()
  "Say whether picons are installed on your machine."
  (let ((installed nil))
    (dolist (database gnus-picon-databases)
      (when (file-exists-p database)
	(setq installed t)))
    installed))

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(defcustom gnus-article-mime-part-function nil
  "Function called with a MIME handle as the argument.
This is meant for people who want to do something automatic based
on parts -- for instance, adding Vcard info to a database."
  :group 'gnus-article-mime
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  :type '(choice (const nil)
		 function))
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(defcustom gnus-mime-multipart-functions nil
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  "An alist of MIME types to functions to display them."
  :version "21.1"
  :group 'gnus-article-mime
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  :type '(repeat (cons :format "%v" (string :tag "MIME type") function)))
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(defcustom gnus-article-date-headers '(combined-lapsed)
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  "A list of Date header formats to display.
Valid formats are `ut' (universal time), `local' (local time
zone), `english' (readable English), `lapsed' (elapsed time),
`combined-lapsed' (both the original date and the elapsed time),
`original' (the original date header), `iso8601' (ISO8601
format), and `user-defined' (a user-defined format defined by the
`gnus-article-time-format' variable).

You have as many date headers as you want in the article buffer.
Some of these headers are updated automatically.  See
`gnus-article-update-date-headers' for details."
  :version "24.1"
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  :group 'gnus-article-headers
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  :type '(set
	  (const :tag "Universal time (UT)" ut)
	  (const :tag "Local time zone" local)
	  (const :tag "Readable English" english)
	  (const :tag "Elapsed time" lapsed)
	  (const :tag "Original and elapsed time" combined-lapsed)
	  (const :tag "Original date header" original)
	  (const :tag "ISO8601 format" iso8601)
	  (const :tag "User-defined" user-defined)))
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(defcustom gnus-article-update-date-headers nil
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  "A number that says how often to update the date header (in seconds).
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If nil, don't update it at all."
  :version "24.1"
  :group 'gnus-article-headers
  :type '(choice
	  (item :tag "Don't update" :value nil)
	  integer))

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(defcustom gnus-article-mime-match-handle-function 'undisplayed-alternative
  "Function called with a MIME handle as the argument.
This is meant for people who want to view first matched part.
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For `undisplayed-alternative' (default), the first undisplayed
part or alternative part is used.  For `undisplayed', the first
undisplayed part is used.  For a function, the first part which
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the function return t is used.  For nil, the first part is
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used."
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  :version "21.1"
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  :group 'gnus-article-mime
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  :type '(choice
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	  (item :tag "first" :value nil)
	  (item :tag "undisplayed" :value undisplayed)
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	  (item :tag "undisplayed or alternative"
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		:value undisplayed-alternative)
	  (function)))

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(defcustom gnus-mime-action-alist
  '(("save to file" . gnus-mime-save-part)
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    ("save and strip" . gnus-mime-save-part-and-strip)
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    ("replace with file" . gnus-mime-replace-part)
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    ("delete part" . gnus-mime-delete-part)
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    ("display as text" . gnus-mime-inline-part)
    ("view the part" . gnus-mime-view-part)
    ("pipe to command" . gnus-mime-pipe-part)
    ("toggle display" . gnus-article-press-button)
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    ("toggle display" . gnus-article-view-part-as-charset)
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    ("view as type" . gnus-mime-view-part-as-type)
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    ("view internally" . gnus-mime-view-part-internally)
    ("view externally" . gnus-mime-view-part-externally))
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  "An alist of actions that run on the MIME attachment."
  :group 'gnus-article-mime
  :type '(repeat (cons (string :tag "name")
		       (function))))

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(defcustom gnus-auto-select-part 1
  "Advance to next MIME part when deleting or stripping parts.

When 0, point will be placed on the same part as before.  When
positive (negative), move point forward (backwards) this many
parts.  When nil, redisplay article."
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  :version "23.1" ;; No Gnus
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  :group 'gnus-article-mime
  :type '(choice (const nil :tag "Redisplay article.")
		 (const 1 :tag "Next part.")
		 (const 0 :tag "Current part.")
		 integer))

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;;;
;;; The treatment variables
;;;

(defvar gnus-part-display-hook nil
  "Hook called on parts that are to receive treatment.")

(defvar gnus-article-treat-custom
  '(choice (const :tag "Off" nil)
	   (const :tag "On" t)
	   (const :tag "Header" head)
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	   (const :tag "First" first)
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	   (const :tag "Last" last)
	   (integer :tag "Less")
	   (repeat :tag "Groups" regexp)
	   (sexp :tag "Predicate")))

(defvar gnus-article-treat-head-custom
  '(choice (const :tag "Off" nil)
	   (const :tag "Header" head)))

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(defvar gnus-article-treat-types '("text/plain" "text/x-verbatim"
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				   "text/x-patch" "text/html")
  "Part types eligible for treatment.")
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(defvar gnus-inhibit-treatment nil
  "Whether to inhibit treatment.")

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(defcustom gnus-treat-highlight-signature '(or t (typep "text/x-vcard"))
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  "Highlight the signature.
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Valid values are nil, t, `head', `first', `last', an integer or a
predicate.  See Info node `(gnus)Customizing Articles'."
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  :group 'gnus-article-treat
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  :link '(custom-manual "(gnus)Customizing Articles")
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  :type gnus-article-treat-custom)
(put 'gnus-treat-highlight-signature 'highlight t)

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(defcustom gnus-treat-buttonize '(and 100000 (typep "text/plain"))
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  "Add buttons.
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Valid values are nil, t, `head', `first', `last', an integer or a
predicate.  See Info node `(gnus)Customizing Articles'."
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  :group 'gnus-article-treat
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  :link '(custom-manual "(gnus)Customizing Articles")
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  :type gnus-article-treat-custom)
(put 'gnus-treat-buttonize 'highlight t)

(defcustom gnus-treat-buttonize-head 'head
  "Add buttons to the head.
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Valid values are nil, t, `head', `first', `last', an integer or a
predicate.  See Info node `(gnus)Customizing Articles'."
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  :group 'gnus-article-treat
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  :link '(custom-manual "(gnus)Customizing Articles")
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  :type gnus-article-treat-head-custom)
(put 'gnus-treat-buttonize-head 'highlight t)

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(defcustom gnus-treat-date 'head
  "Display dates according to the `gnus-article-date-headers' variable.
Valid values are nil, t, `head', `first', `last', an integer or a
predicate.  See Info node `(gnus)Customizing Articles'."
  :version "24.1"
  :group 'gnus-article-treat
  :link '(custom-manual "(gnus)Customizing Articles")
  :type gnus-article-treat-head-custom)

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(defcustom gnus-treat-emphasize 50000
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  "Emphasize text.
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Valid values are nil, t, `head', `first', `last', an integer or a
predicate.  See Info node `(gnus)Customizing Articles'."
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  :group 'gnus-article-treat
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  :link '(custom-manual "(gnus)Customizing Articles")
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  :type gnus-article-treat-custom)
(put 'gnus-treat-emphasize 'highlight t)

(defcustom gnus-treat-strip-cr nil
  "Remove carriage returns.