;;; gnus-art.el --- article mode commands for Gnus
;; Copyright (C) 1996 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@ifi.uio.no>
;; Keywords: news

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

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

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;; Code:

(require 'gnus-load)
(require 'gnus-sum)
(require 'article)
(require 'gnus-spec)
(require 'gnus-int)

(defvar gnus-article-save-directory gnus-directory
  "*Name of the directory articles will be saved in (default \"~/News\").")

(defvar gnus-save-all-headers t
  "*If non-nil, don't remove any headers before saving.")

(defvar 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.")

(defvar 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
will be kept while the rest will be deleted before saving.")

(defvar gnus-default-article-saver 'gnus-summary-save-in-rmail
  "*A function to save articles in your favorite format.
The function must be interactively callable (in other words, it must
be an Emacs command).

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).
* gnus-summary-save-in-vm (use VM's folder format).")

(defvar gnus-rmail-save-name (function 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.")

(defvar gnus-mail-save-name (function 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.")

(defvar gnus-folder-save-name (function 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.")

(defvar gnus-file-save-name (function 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.")

(defvar gnus-split-methods
  '((gnus-article-archive-name))
  "*Variable used to suggest where articles are to be saved.
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:

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

This variable is an alist where the where the key is the match and the
value is a list of possible files to save in if the match is non-nil.

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
parameter.  If it is a list, it will be evaled in the same buffer.

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.")

(defvar gnus-strict-mime t
  "*If nil, MIME-decode even if there is no Mime-Version header in the article.")

(defvar gnus-show-mime-method 'metamail-buffer
  "*Function to process a MIME message.
The function is called from the article buffer.")

(defvar gnus-decode-encoded-word-method (lambda ())
  "*Function to decode a MIME encoded-words.
The function is called from the article buffer.")

(defvar 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.")

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

(defvar gnus-article-mode-hook nil
  "*A hook for Gnus article mode.")

(defvar gnus-article-prepare-hook nil
  "*A hook called after an article has been prepared in the article buffer.
If you want to run a special decoding program like nkf, use this hook.")

;(defvar gnus-article-display-hook nil
;  "*A hook called after the article is displayed in the article buffer.
;The hook is designed to change the contents of the article
;buffer.  Typical functions that this hook may contain are
;`gnus-article-hide-headers' (hide selected headers),
;`gnus-article-maybe-highlight' (perform fancy article highlighting),
;`gnus-article-hide-signature' (hide signature) and
;`gnus-article-treat-overstrike' (turn \"^H_\" into bold characters).")
;(add-hook 'gnus-article-display-hook 'gnus-article-hide-headers-if-wanted)
;(add-hook 'gnus-article-display-hook 'gnus-article-treat-overstrike)
;(add-hook 'gnus-article-display-hook 'gnus-article-maybe-highlight)

;;; Internal variables

(defvar gnus-article-mode-line-format-alist
    (nconc '((?w (gnus-article-wash-status) ?s))
	   gnus-summary-mode-line-format-alist))

;;; Provide a mapping from `gnus-*' commands to Article commands.

(eval-and-compile
  (mapcar
   (lambda (func)
     (let (afunc gfunc)
       (if (consp func)
	   (setq afunc (car func)
		 gfunc (cdr func))
	 (setq afunc func
	       gfunc (intern (format "gnus-%s" func))))
       (fset gfunc 
	     `(lambda (&optional interactive &rest args)
		,(documentation afunc t)
		(interactive (list t))
		(save-excursion
		  (set-buffer gnus-article-buffer)
		  (if interactive
		      (call-interactively ',afunc)
		    (apply ',afunc args)))))))
   '(article-hide-headers
     article-hide-boring-headers
     article-treat-overstrike
     (article-fill . gnus-article-word-wrap)
     article-remove-cr
     article-remove-trailing-blank-lines
     article-display-x-face
     article-de-quoted-unreadable
     article-mime-decode-quoted-printable
     article-hide-pgp
     article-hide-pem
     article-hide-signature
     article-strip-leading-blank-lines
     article-date-local
     article-date-original
     article-date-lapsed
     article-emphasize
     (article-show-all . gnus-article-show-all-headers))))

(defalias 'gnus-decode-rfc1522 'article-decode-rfc1522)

;;; Saving functions.

(defun gnus-article-save (save-buffer file)
  "Save the currently selected article."
  (unless gnus-save-all-headers
    ;; Remove headers accoring to `gnus-saved-headers'.
    (let ((gnus-visible-headers
	   (or gnus-saved-headers gnus-visible-headers))
	  (gnus-article-buffer save-buffer))
      (gnus-article-hide-headers 1 t)))
  (save-window-excursion
    (if (not gnus-default-article-saver)
	(error "No default saver is defined.")
      ;; !!! Magic!  The saving functions all save
      ;; `gnus-original-article-buffer' (or so they think),
      ;; but we bind that variable to our save-buffer.
      (set-buffer gnus-article-buffer)
      (let ((gnus-original-article-buffer save-buffer))
	(set-buffer gnus-summary-buffer)
	(funcall
	 gnus-default-article-saver
	 (cond
	  ((not gnus-prompt-before-saving)
	   'default)
	  ((eq gnus-prompt-before-saving 'always)
	   nil)
	  (t file)))))))

(defun gnus-read-save-file-name (prompt default-name)
  (let* ((split-name (gnus-get-split-value gnus-split-methods))
	 (file
	  ;; Let the split methods have their say.
	  (cond
	   ;; No split name was found.
	   ((null split-name)
	    (read-file-name
	     (concat prompt " (default "
		     (file-name-nondirectory default-name) ") ")
	     (file-name-directory default-name)
	     default-name))
	   ;; A single split name was found
	   ((= 1 (length split-name))
 	    (let* ((name (car split-name))
 		   (dir (cond ((file-directory-p name)
 			       (file-name-as-directory name))
 			      ((file-exists-p name) name)
 			      (t gnus-article-save-directory))))
 	      (read-file-name
 	       (concat prompt " (default " name ") ")
 	       dir name)))
	   ;; A list of splits was found.
	   (t
	    (setq split-name (nreverse split-name))
	    (let (result)
	      (let ((file-name-history (nconc split-name file-name-history)))
		(setq result
		      (read-file-name
		       (concat prompt " (`M-p' for defaults) ")
		       gnus-article-save-directory
		       (car split-name))))
	      (car (push result file-name-history)))))))
    ;; Create the directory.
    (unless (equal (directory-file-name file) file)
      (make-directory (file-name-directory file) t))
    ;; If we have read a directory, we append the default file name.
    (when (file-directory-p file)
      (setq file (concat (file-name-as-directory file)
			 (file-name-nondirectory default-name))))
    ;; Possibly translate some characters.
    (nnheader-translate-file-chars file)))

(defun gnus-article-archive-name (group)
  "Return the first instance of an \"Archive-name\" in the current buffer."
  (let ((case-fold-search t))
    (when (re-search-forward "archive-name: *\\([^ \n\t]+\\)[ \t]*$" nil t)
      (nnheader-concat gnus-article-save-directory
		       (match-string 1)))))

(defun gnus-summary-save-in-rmail (&optional filename)
  "Append this article to Rmail file.
Optional argument FILENAME specifies file name.
Directory to save to is default to `gnus-article-save-directory'."
  (interactive)
  (gnus-set-global-variables)
  (let ((default-name
	  (funcall gnus-rmail-save-name gnus-newsgroup-name
		   gnus-current-headers gnus-newsgroup-last-rmail)))
    (setq filename
	  (cond ((eq filename 'default)
		 default-name)
		(filename filename)
		(t (gnus-read-save-file-name
		    "Save in rmail file:" default-name))))
    (make-directory (file-name-directory filename) t)
    (gnus-eval-in-buffer-window gnus-original-article-buffer
      (save-excursion
	(save-restriction
	  (widen)
	  (gnus-output-to-rmail filename))))
    ;; Remember the directory name to save articles
    (setq gnus-newsgroup-last-rmail filename)))

(defun gnus-summary-save-in-mail (&optional filename)
  "Append this article to Unix mail file.
Optional argument FILENAME specifies file name.
Directory to save to is default to `gnus-article-save-directory'."
  (interactive)
  (gnus-set-global-variables)
  (let ((default-name
	  (funcall gnus-mail-save-name gnus-newsgroup-name
		   gnus-current-headers gnus-newsgroup-last-mail)))
    (setq filename
	  (cond ((eq filename 'default)
		 default-name)
		(filename filename)
		(t (gnus-read-save-file-name
		    "Save in Unix mail file:" default-name))))
    (setq filename
	  (expand-file-name filename
			    (and default-name
				 (file-name-directory default-name))))
    (make-directory (file-name-directory filename) t)
    (gnus-eval-in-buffer-window gnus-original-article-buffer
      (save-excursion
	(save-restriction
	  (widen)
	  (if (and (file-readable-p filename) (mail-file-babyl-p filename))
	      (gnus-output-to-rmail filename)
	    (let ((mail-use-rfc822 t))
	      (rmail-output filename 1 t t))))))
    ;; Remember the directory name to save articles.
    (setq gnus-newsgroup-last-mail filename)))

(defun gnus-summary-save-in-file (&optional filename)
  "Append this article to file.
Optional argument FILENAME specifies file name.
Directory to save to is default to `gnus-article-save-directory'."
  (interactive)
  (gnus-set-global-variables)
  (let ((default-name
	  (funcall gnus-file-save-name gnus-newsgroup-name
		   gnus-current-headers gnus-newsgroup-last-file)))
    (setq filename
	  (cond ((eq filename 'default)
		 default-name)
		(filename filename)
		(t (gnus-read-save-file-name
		    "Save in file:" default-name))))
    (make-directory (file-name-directory filename) t)
    (gnus-eval-in-buffer-window gnus-original-article-buffer
      (save-excursion
	(save-restriction
	  (widen)
	  (gnus-output-to-file filename))))
    ;; Remember the directory name to save articles.
    (setq gnus-newsgroup-last-file filename)))

(defun gnus-summary-save-body-in-file (&optional filename)
  "Append this article body to a file.
Optional argument FILENAME specifies file name.
The directory to save in defaults to `gnus-article-save-directory'."
  (interactive)
  (gnus-set-global-variables)
  (let ((default-name
	  (funcall gnus-file-save-name gnus-newsgroup-name
		   gnus-current-headers gnus-newsgroup-last-file)))
    (setq filename
	  (cond ((eq filename 'default)
		 default-name)
		(filename filename)
		(t (gnus-read-save-file-name
		    "Save body in file:" default-name))))
    (make-directory (file-name-directory filename) t)
    (gnus-eval-in-buffer-window gnus-original-article-buffer
      (save-excursion
	(save-restriction
	  (widen)
	  (goto-char (point-min))
	  (and (search-forward "\n\n" nil t)
	       (narrow-to-region (point) (point-max)))
	  (gnus-output-to-file filename))))
    ;; Remember the directory name to save articles.
    (setq gnus-newsgroup-last-file filename)))

(defun gnus-summary-save-in-pipe (&optional command)
  "Pipe this article to subprocess."
  (interactive)
  (gnus-set-global-variables)
  (setq command
	(cond ((eq command 'default)
	       gnus-last-shell-command)
	      (command command)
	      (t (read-string "Shell command on article: "
			      gnus-last-shell-command))))
  (if (string-equal command "")
      (setq command gnus-last-shell-command))
  (gnus-eval-in-buffer-window gnus-article-buffer
    (save-restriction
      (widen)
      (shell-command-on-region (point-min) (point-max) command nil)))
  (setq gnus-last-shell-command command))

;;; Article file names when saving.

(defun gnus-capitalize-newsgroup (newsgroup)
  "Capitalize NEWSGROUP name."
  (and (not (zerop (length newsgroup)))
       (concat (char-to-string (upcase (aref newsgroup 0)))
	       (substring newsgroup 1))))

(defun gnus-Numeric-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is nil, it is ~/News/News.group/num.
Otherwise, it is like ~/News/news/group/num."
  (let ((default
	  (expand-file-name
	   (concat (if (gnus-use-long-file-name 'not-save)
		       (gnus-capitalize-newsgroup newsgroup)
		     (gnus-newsgroup-directory-form newsgroup))
		   "/" (int-to-string (mail-header-number headers)))
	   gnus-article-save-directory)))
    (if (and last-file
	     (string-equal (file-name-directory default)
			   (file-name-directory last-file))
	     (string-match "^[0-9]+$" (file-name-nondirectory last-file)))
	default
      (or last-file default))))

(defun gnus-numeric-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is non-nil, it is
~/News/news.group/num.	Otherwise, it is like ~/News/news/group/num."
  (let ((default
	  (expand-file-name
	   (concat (if (gnus-use-long-file-name 'not-save)
		       newsgroup
		     (gnus-newsgroup-directory-form newsgroup))
		   "/" (int-to-string (mail-header-number headers)))
	   gnus-article-save-directory)))
    (if (and last-file
	     (string-equal (file-name-directory default)
			   (file-name-directory last-file))
	     (string-match "^[0-9]+$" (file-name-nondirectory last-file)))
	default
      (or last-file default))))

(defun gnus-Plain-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is non-nil, it is
~/News/News.group.  Otherwise, it is like ~/News/news/group/news."
  (or last-file
      (expand-file-name
       (if (gnus-use-long-file-name 'not-save)
	   (gnus-capitalize-newsgroup newsgroup)
	 (concat (gnus-newsgroup-directory-form newsgroup) "/news"))
       gnus-article-save-directory)))

(defun gnus-plain-save-name (newsgroup headers &optional last-file)
  "Generate file name from NEWSGROUP, HEADERS, and optional LAST-FILE.
If variable `gnus-use-long-file-name' is non-nil, it is
~/News/news.group.  Otherwise, it is like ~/News/news/group/news."
  (or last-file
      (expand-file-name
       (if (gnus-use-long-file-name 'not-save)
	   newsgroup
	 (concat (gnus-newsgroup-directory-form newsgroup) "/news"))
       gnus-article-save-directory)))


;;;
;;; Gnus article mode
;;;

(put 'gnus-article-mode 'mode-class 'special)

(when t
  (gnus-define-keys gnus-article-mode-map
    " " gnus-article-goto-next-page
    "\177" gnus-article-goto-prev-page
    [delete] gnus-article-goto-prev-page
    "\C-c^" gnus-article-refer-article
    "h" gnus-article-show-summary
    "s" gnus-article-show-summary
    "\C-c\C-m" gnus-article-mail
    "?" gnus-article-describe-briefly
    gnus-mouse-2 gnus-article-push-button
    "\r" gnus-article-press-button
    "\t" gnus-article-next-button
    "\M-\t" gnus-article-prev-button
    "<" beginning-of-buffer
    ">" end-of-buffer
    "\C-c\C-i" gnus-info-find-node
    "\C-c\C-b" gnus-bug)

  (substitute-key-definition
   'undefined 'gnus-article-read-summary-keys gnus-article-mode-map))

(defun gnus-article-mode ()
  "Major mode for displaying an article.

All normal editing commands are switched off.

The following commands are available:

\\<gnus-article-mode-map>
\\[gnus-article-next-page]\t Scroll the article one page forwards
\\[gnus-article-prev-page]\t Scroll the article one page backwards
\\[gnus-article-refer-article]\t Go to the article referred to by an article id near point
\\[gnus-article-show-summary]\t Display the summary buffer
\\[gnus-article-mail]\t Send a reply to the address near point
\\[gnus-article-describe-briefly]\t Describe the current mode briefly
\\[gnus-info-find-node]\t Go to the Gnus info node"
  (interactive)
  (when (and menu-bar-mode
	     (gnus-visual-p 'article-menu 'menu))
    (gnus-article-make-menu-bar))
  (kill-all-local-variables)
  (gnus-simplify-mode-line)
  (setq mode-name "Article")
  (setq major-mode 'gnus-article-mode)
  (make-local-variable 'minor-mode-alist)
  (or (assq 'gnus-show-mime minor-mode-alist)
      (setq minor-mode-alist
	    (cons (list 'gnus-show-mime " MIME") minor-mode-alist)))
  (use-local-map gnus-article-mode-map)
  (gnus-update-format-specifications nil 'article-mode)
  (make-local-variable 'page-delimiter)
  (setq page-delimiter gnus-page-delimiter)
  (buffer-disable-undo (current-buffer))
  (setq buffer-read-only t)		;Disable modification
  (run-hooks 'gnus-article-mode-hook))

(defun gnus-article-setup-buffer ()
  "Initialize the article buffer."
  (let* ((name (if gnus-single-article-buffer "*Article*"
		 (concat "*Article " gnus-newsgroup-name "*")))
	 (original
	  (progn (string-match "\\*Article" name)
		 (concat " *Original Article"
			 (substring name (match-end 0))))))
    (setq gnus-article-buffer name)
    (setq gnus-original-article-buffer original)
    ;; This might be a variable local to the summary buffer.
    (unless gnus-single-article-buffer
      (save-excursion
	(set-buffer gnus-summary-buffer)
	(setq gnus-article-buffer name)
	(setq gnus-original-article-buffer original)
	(gnus-set-global-variables))
      (make-local-variable 'gnus-summary-buffer))
    ;; Init original article buffer.
    (save-excursion
      (set-buffer (get-buffer-create gnus-original-article-buffer))
      (buffer-disable-undo (current-buffer))
      (setq major-mode 'gnus-original-article-mode)
      (gnus-add-current-to-buffer-list)
      (make-local-variable 'gnus-original-article))
    (if (get-buffer name)
	(save-excursion
	  (set-buffer name)
	  (buffer-disable-undo (current-buffer))
	  (setq buffer-read-only t)
	  (gnus-add-current-to-buffer-list)
	  (or (eq major-mode 'gnus-article-mode)
	      (gnus-article-mode))
	  (current-buffer))
      (save-excursion
	(set-buffer (get-buffer-create name))
	(gnus-add-current-to-buffer-list)
	(gnus-article-mode)
	(current-buffer)))))

;; Set article window start at LINE, where LINE is the number of lines
;; from the head of the article.
(defun gnus-article-set-window-start (&optional line)
  (set-window-start
   (get-buffer-window gnus-article-buffer t)
   (save-excursion
     (set-buffer gnus-article-buffer)
     (goto-char (point-min))
     (if (not line)
	 (point-min)
       (gnus-message 6 "Moved to bookmark")
       (search-forward "\n\n" nil t)
       (forward-line line)
       (point)))))

(defun gnus-article-prepare (article &optional all-headers header)
  "Prepare ARTICLE in article mode buffer.
ARTICLE should either be an article number or a Message-ID.
If ARTICLE is an id, HEADER should be the article headers.
If ALL-HEADERS is non-nil, no headers are hidden."
  (save-excursion
    ;; Make sure we start in a summary buffer.
    (unless (eq major-mode 'gnus-summary-mode)
      (set-buffer gnus-summary-buffer))
    (setq gnus-summary-buffer (current-buffer))
    ;; Make sure the connection to the server is alive.
    (unless (gnus-server-opened
	     (gnus-find-method-for-group gnus-newsgroup-name))
      (gnus-check-server (gnus-find-method-for-group gnus-newsgroup-name))
      (gnus-request-group gnus-newsgroup-name t))
    (let* ((article (if header (mail-header-number header) article))
	   (summary-buffer (current-buffer))
	   (internal-hook gnus-article-internal-prepare-hook)
	   (group gnus-newsgroup-name)
	   result)
      (save-excursion
	(gnus-article-setup-buffer)
	(set-buffer gnus-article-buffer)
	;; Deactivate active regions.
	(when (and (boundp 'transient-mark-mode)
		   transient-mark-mode)
	  (setq mark-active nil))
	(if (not (setq result (let ((buffer-read-only nil))
				(gnus-request-article-this-buffer
				 article group))))
	    ;; There is no such article.
	    (save-excursion
	      (when (and (numberp article)
			 (not (memq article gnus-newsgroup-sparse)))
		(setq gnus-article-current
		      (cons gnus-newsgroup-name article))
		(set-buffer gnus-summary-buffer)
		(setq gnus-current-article article)
		(gnus-summary-mark-article article gnus-canceled-mark))
	      (unless (memq article gnus-newsgroup-sparse)
		(gnus-error
		 1 "No such article (may have expired or been canceled)")))
	  (if (or (eq result 'pseudo) (eq result 'nneething))
	      (progn
		(save-excursion
		  (set-buffer summary-buffer)
		  (setq gnus-last-article gnus-current-article
			gnus-newsgroup-history (cons gnus-current-article
						     gnus-newsgroup-history)
			gnus-current-article 0
			gnus-current-headers nil
			gnus-article-current nil)
		  (if (eq result 'nneething)
		      (gnus-configure-windows 'summary)
		    (gnus-configure-windows 'article))
		  (gnus-set-global-variables))
		(gnus-set-mode-line 'article))
	    ;; The result from the `request' was an actual article -
	    ;; or at least some text that is now displayed in the
	    ;; article buffer.
	    (if (and (numberp article)
		     (not (eq article gnus-current-article)))
		;; Seems like a new article has been selected.
		;; `gnus-current-article' must be an article number.
		(save-excursion
		  (set-buffer summary-buffer)
		  (setq gnus-last-article gnus-current-article
			gnus-newsgroup-history (cons gnus-current-article
						     gnus-newsgroup-history)
			gnus-current-article article
			gnus-current-headers
			(gnus-summary-article-header gnus-current-article)
			gnus-article-current
			(cons gnus-newsgroup-name gnus-current-article))
		  (unless (vectorp gnus-current-headers)
		    (setq gnus-current-headers nil))
		  (gnus-summary-show-thread)
		  (run-hooks 'gnus-mark-article-hook)
		  (gnus-set-mode-line 'summary)
		  (and (gnus-visual-p 'article-highlight 'highlight)
		       (run-hooks 'gnus-visual-mark-article-hook))
		  ;; Set the global newsgroup variables here.
		  ;; Suggested by Jim Sisolak
		  ;; <sisolak@trans4.neep.wisc.edu>.
		  (gnus-set-global-variables)
		  (setq gnus-have-all-headers
			(or all-headers gnus-show-all-headers))
		  (and gnus-use-cache
		       (vectorp (gnus-summary-article-header article))
		       (gnus-cache-possibly-enter-article
			group article
			(gnus-summary-article-header article)
			(memq article gnus-newsgroup-marked)
			(memq article gnus-newsgroup-dormant)
			(memq article gnus-newsgroup-unreads)))))
	    (when (or (numberp article)
		      (stringp article))
	      ;; Hooks for getting information from the article.
	      ;; This hook must be called before being narrowed.
	      (let (buffer-read-only)
		(run-hooks 'internal-hook)
		(run-hooks 'gnus-article-prepare-hook)
		;; Decode MIME message.
		(if gnus-show-mime
		    (if (or (not gnus-strict-mime)
			    (gnus-fetch-field "Mime-Version"))
			(funcall gnus-show-mime-method)
		      (funcall gnus-decode-encoded-word-method)))
		;; Perform the article display hooks.
		(run-hooks 'gnus-article-display-hook))
	      ;; Do page break.
	      (goto-char (point-min))
	      (and gnus-break-pages (gnus-narrow-to-page)))
	    (gnus-set-mode-line 'article)
	    (gnus-configure-windows 'article)
	    (goto-char (point-min))
	    t))))))

(defun gnus-article-wash-status ()
  "Return a string which display status of article washing."
  (save-excursion
    (set-buffer gnus-article-buffer)
    (let ((cite (article-hidden-text-p 'cite))
	  (headers (article-hidden-text-p 'headers))
	  (boring (article-hidden-text-p 'boring-headers))
	  (pgp (article-hidden-text-p 'pgp))
	  (pem (article-hidden-text-p 'pem))
	  (signature (article-hidden-text-p 'signature))
	  (overstrike (article-hidden-text-p 'overstrike))
	  (emphasis (article-hidden-text-p 'emphasis))
	  (mime gnus-show-mime))
      (format "%c%c%c%c%c%c%c"
	      (if cite ?c ? )
	      (if (or headers boring) ?h ? )
	      (if (or pgp pem) ?p ? )
	      (if signature ?s ? )
	      (if overstrike ?o ? )
	      (if mime ?m ? )
	      (if emphasis ?e ? )))))

(defun gnus-article-hide-headers-if-wanted ()
  "Hide unwanted headers if `gnus-have-all-headers' is nil.
Provided for backwards compatibility."
  (or (save-excursion (set-buffer gnus-summary-buffer) gnus-have-all-headers)
      gnus-inhibit-hiding
      (gnus-article-hide-headers)))

;;; Article savers.

(defun gnus-output-to-rmail (file-name)
  "Append the current article to an Rmail file named FILE-NAME."
  (require 'rmail)
  ;; Most of these codes are borrowed from rmailout.el.
  (setq file-name (expand-file-name file-name))
  (setq rmail-default-rmail-file file-name)
  (let ((artbuf (current-buffer))
	(tmpbuf (get-buffer-create " *Gnus-output*")))
    (save-excursion
      (or (get-file-buffer file-name)
	  (file-exists-p file-name)
	  (if (gnus-yes-or-no-p
	       (concat "\"" file-name "\" does not exist, create it? "))
	      (let ((file-buffer (create-file-buffer file-name)))
		(save-excursion
		  (set-buffer file-buffer)
		  (rmail-insert-rmail-file-header)
		  (let ((require-final-newline nil))
		    (write-region (point-min) (point-max) file-name t 1)))
		(kill-buffer file-buffer))
	    (error "Output file does not exist")))
      (set-buffer tmpbuf)
      (buffer-disable-undo (current-buffer))
      (erase-buffer)
      (insert-buffer-substring artbuf)
      (gnus-convert-article-to-rmail)
      ;; Decide whether to append to a file or to an Emacs buffer.
      (let ((outbuf (get-file-buffer file-name)))
	(if (not outbuf)
	    (append-to-file (point-min) (point-max) file-name)
	  ;; File has been visited, in buffer OUTBUF.
	  (set-buffer outbuf)
	  (let ((buffer-read-only nil)
		(msg (and (boundp 'rmail-current-message)
			  (symbol-value 'rmail-current-message))))
	    ;; If MSG is non-nil, buffer is in RMAIL mode.
	    (if msg
		(progn (widen)
		       (narrow-to-region (point-max) (point-max))))
	    (insert-buffer-substring tmpbuf)
	    (if msg
		(progn
		  (goto-char (point-min))
		  (widen)
		  (search-backward "\^_")
		  (narrow-to-region (point) (point-max))
		  (goto-char (1+ (point-min)))
		  (rmail-count-new-messages t)
		  (rmail-show-message msg)))))))
    (kill-buffer tmpbuf)))

(defun gnus-output-to-file (file-name)
  "Append the current article to a file named FILE-NAME."
  (let ((artbuf (current-buffer)))
    (nnheader-temp-write nil
      (insert-buffer-substring artbuf)
      ;; Append newline at end of the buffer as separator, and then
      ;; save it to file.
      (goto-char (point-max))
      (insert "\n")
      (append-to-file (point-min) (point-max) file-name))))

(defun gnus-convert-article-to-rmail ()
  "Convert article in current buffer to Rmail message format."
  (let ((buffer-read-only nil))
    ;; Convert article directly into Babyl format.
    ;; Suggested by Rob Austein <sra@lcs.mit.edu>
    (goto-char (point-min))
    (insert "\^L\n0, unseen,,\n*** EOOH ***\n")
    (while (search-forward "\n\^_" nil t) ;single char
      (replace-match "\n^_" t t))	;2 chars: "^" and "_"
    (goto-char (point-max))
    (insert "\^_")))

(defun gnus-narrow-to-page (&optional arg)
  "Narrow the article buffer to a page.
If given a numerical ARG, move forward ARG pages."
  (interactive "P")
  (setq arg (if arg (prefix-numeric-value arg) 0))
  (save-excursion
    (set-buffer gnus-article-buffer)
    (goto-char (point-min))
    (widen)
    (when (gnus-visual-p 'page-marker)
      (let ((buffer-read-only nil))
	(gnus-remove-text-with-property 'gnus-prev)
	(gnus-remove-text-with-property 'gnus-next)))
    (when
	(cond ((< arg 0)
	       (re-search-backward page-delimiter nil 'move (1+ (abs arg))))
	      ((> arg 0)
	       (re-search-forward page-delimiter nil 'move arg)))
      (goto-char (match-end 0)))
    (narrow-to-region
     (point)
     (if (re-search-forward page-delimiter nil 'move)
	 (match-beginning 0)
       (point)))
    (when (and (gnus-visual-p 'page-marker)
	       (not (= (point-min) 1)))
      (save-excursion
	(goto-char (point-min))
	(gnus-insert-prev-page-button)))
    (when (and (gnus-visual-p 'page-marker)
	       (not (= (1- (point-max)) (buffer-size))))
      (save-excursion
	(goto-char (point-max))
	(gnus-insert-next-page-button)))))

;; Article mode commands

(defun gnus-article-goto-next-page ()
  "Show the next page of the article."
  (interactive)
  (when (gnus-article-next-page)
    (gnus-article-read-summary-keys nil (gnus-character-to-event ?n))))

(defun gnus-article-goto-prev-page ()
  "Show the next page of the article."
  (interactive)
  (if (bobp) (gnus-article-read-summary-keys nil (gnus-character-to-event ?n))
    (gnus-article-prev-page nil)))

(defun gnus-article-next-page (&optional lines)
  "Show the next page of the current article.
If end of article, return non-nil.  Otherwise return nil.
Argument LINES specifies lines to be scrolled up."
  (interactive "p")
  (move-to-window-line -1)
  ;; Fixed by enami@ptgd.sony.co.jp (enami tsugutomo)
  (if (save-excursion
	(end-of-line)
	(and (pos-visible-in-window-p)	;Not continuation line.
	     (eobp)))
      ;; Nothing in this page.
      (if (or (not gnus-break-pages)
	      (save-excursion
		(save-restriction
		  (widen) (forward-line 1) (eobp)))) ;Real end-of-buffer?
	  t				;Nothing more.
	(gnus-narrow-to-page 1)		;Go to next page.
	nil)
    ;; More in this page.
    (condition-case ()
	(scroll-up lines)
      (end-of-buffer
       ;; Long lines may cause an end-of-buffer error.
       (goto-char (point-max))))
    (move-to-window-line 0)
    nil))

(defun gnus-article-prev-page (&optional lines)
  "Show previous page of current article.
Argument LINES specifies lines to be scrolled down."
  (interactive "p")
  (move-to-window-line 0)
  (if (and gnus-break-pages
	   (bobp)
	   (not (save-restriction (widen) (bobp)))) ;Real beginning-of-buffer?
      (progn
	(gnus-narrow-to-page -1)	;Go to previous page.
	(goto-char (point-max))
	(recenter -1))
    (prog1
	(condition-case ()
	    (scroll-down lines)
	  (error nil))
      (move-to-window-line 0))))

(defun gnus-article-refer-article ()
  "Read article specified by message-id around point."
  (interactive)
  (let ((point (point)))
    (search-forward ">" nil t)		;Move point to end of "<....>".
    (if (re-search-backward "\\(<[^<> \t\n]+>\\)" nil t)
	(let ((message-id (match-string 1)))
	  (goto-char point)
	  (set-buffer gnus-summary-buffer)
	  (gnus-summary-refer-article message-id))
      (goto-char (point))
      (error "No references around point"))))

(defun gnus-article-show-summary ()
  "Reconfigure windows to show summary buffer."
  (interactive)
  (gnus-configure-windows 'article)
  (gnus-summary-goto-subject gnus-current-article))

(defun gnus-article-describe-briefly ()
  "Describe article mode commands briefly."
  (interactive)
  (gnus-message 6
		(substitute-command-keys "\\<gnus-article-mode-map>\\[gnus-article-goto-next-page]:Next page	 \\[gnus-article-goto-prev-page]:Prev page  \\[gnus-article-show-summary]:Show summary  \\[gnus-info-find-node]:Run Info  \\[gnus-article-describe-briefly]:This help")))

(defun gnus-article-summary-command ()
  "Execute the last keystroke in the summary buffer."
  (interactive)
  (let ((obuf (current-buffer))
	(owin (current-window-configuration))
	func)
    (switch-to-buffer gnus-summary-buffer 'norecord)
    (setq func (lookup-key (current-local-map) (this-command-keys)))
    (call-interactively func)
    (set-buffer obuf)
    (set-window-configuration owin)
    (set-window-point (get-buffer-window (current-buffer)) (point))))

(defun gnus-article-summary-command-nosave ()
  "Execute the last keystroke in the summary buffer."
  (interactive)
  (let (func)
    (pop-to-buffer gnus-summary-buffer 'norecord)
    (setq func (lookup-key (current-local-map) (this-command-keys)))
    (call-interactively func)))

(defun gnus-article-read-summary-keys (&optional arg key not-restore-window)
  "Read a summary buffer key sequence and execute it from the article buffer."
  (interactive "P")
  (let ((nosaves
	 '("q" "Q"  "c" "r" "R" "\C-c\C-f" "m"	"a" "f" "F"
	   "Zc" "ZC" "ZE" "ZQ" "ZZ" "Zn" "ZR" "ZG" "ZN" "ZP"
	   "=" "^" "\M-^" "|"))
	(nosave-but-article
	 '("A\r"))
	keys)
    (save-excursion
      (set-buffer gnus-summary-buffer)
      (push (or key last-command-event) unread-command-events)
      (setq keys (read-key-sequence nil)))
    (message "")

    (if (or (member keys nosaves)
	    (member keys nosave-but-article))
	(let (func)
	  (save-window-excursion
	    (pop-to-buffer gnus-summary-buffer 'norecord)
	    (setq func (lookup-key (current-local-map) keys)))
	  (if (not func)
	      (ding)
	    (set-buffer gnus-summary-buffer)
	    (call-interactively func))
	  (when (member keys nosave-but-article)
	    (pop-to-buffer gnus-article-buffer 'norecord)))
      (let ((obuf (current-buffer))
	    (owin (current-window-configuration))
	    (opoint (point))
	    func in-buffer)
	(if not-restore-window
	    (pop-to-buffer gnus-summary-buffer 'norecord)
	  (switch-to-buffer gnus-summary-buffer 'norecord))
	(setq in-buffer (current-buffer))
	(if (setq func (lookup-key (current-local-map) keys))
	    (call-interactively func)
	  (ding))
	(when (eq in-buffer (current-buffer))
	  (set-buffer obuf)
	  (unless not-restore-window
	    (set-window-configuration owin))
	  (set-window-point (get-buffer-window (current-buffer)) opoint))))))

(defun gnus-article-hide (&optional arg force)
  "Hide all the gruft in the current article.
This means that PGP stuff, signatures, cited text and (some)
headers will be hidden.
If given a prefix, show the hidden text instead."
  (interactive (list current-prefix-arg 'force))
  (gnus-article-hide-headers arg)
  (gnus-article-hide-pgp arg)
  (gnus-article-hide-citation-maybe arg force)
  (gnus-article-hide-signature arg))

(defun gnus-article-maybe-highlight ()
  "Do some article highlighting if `article-visual' is non-nil."
  (if (gnus-visual-p 'article-highlight 'highlight)
      (gnus-article-highlight-some)))

(defun gnus-request-article-this-buffer (article group)
  "Get an article and insert it into this buffer."
  (let (do-update-line)
    (prog1
	(save-excursion
	  (erase-buffer)
	  (gnus-kill-all-overlays)
	  (setq group (or group gnus-newsgroup-name))

	  ;; Open server if it has closed.
	  (gnus-check-server (gnus-find-method-for-group group))

	  ;; Using `gnus-request-article' directly will insert the article into
	  ;; `nntp-server-buffer' - so we'll save some time by not having to
	  ;; copy it from the server buffer into the article buffer.

	  ;; We only request an article by message-id when we do not have the
	  ;; headers for it, so we'll have to get those.
	  (when (stringp article)
	    (let ((gnus-override-method gnus-refer-article-method))
	      (gnus-read-header article)))

	  ;; If the article number is negative, that means that this article
	  ;; doesn't belong in this newsgroup (possibly), so we find its
	  ;; message-id and request it by id instead of number.
	  (when (and (numberp article)
		     gnus-summary-buffer
		     (get-buffer gnus-summary-buffer)
		     (buffer-name (get-buffer gnus-summary-buffer)))
	    (save-excursion
	      (set-buffer gnus-summary-buffer)
	      (let ((header (gnus-summary-article-header article)))
		(if (< article 0)
		    (cond 
		     ((memq article gnus-newsgroup-sparse)
		      ;; This is a sparse gap article.
		      (setq do-update-line article)
		      (setq article (mail-header-id header))
		      (let ((gnus-override-method gnus-refer-article-method))
			(gnus-read-header article))
		      (setq gnus-newsgroup-sparse
			    (delq article gnus-newsgroup-sparse)))
		     ((vectorp header)
		      ;; It's a real article.
		      (setq article (mail-header-id header)))
		     (t
		      ;; It is an extracted pseudo-article.
		      (setq article 'pseudo)
		      (gnus-request-pseudo-article header))))
		
		(let ((method (gnus-find-method-for-group 
			       gnus-newsgroup-name)))
		  (if (not (eq (car method) 'nneething))
		      ()
		    (let ((dir (concat (file-name-as-directory (nth 1 method))
				       (mail-header-subject header))))
		      (if (file-directory-p dir)
			  (progn
			    (setq article 'nneething)
			    (gnus-group-enter-directory dir)))))))))

	  (cond
	   ;; Refuse to select canceled articles.
	   ((and (numberp article)
		 gnus-summary-buffer
		 (get-buffer gnus-summary-buffer)
		 (buffer-name (get-buffer gnus-summary-buffer))
		 (eq (cdr (save-excursion
			    (set-buffer gnus-summary-buffer)
			    (assq article gnus-newsgroup-reads)))
		     gnus-canceled-mark))
	    nil)
	   ;; We first check `gnus-original-article-buffer'.
	   ((and (get-buffer gnus-original-article-buffer)
		 (numberp article)
		 (save-excursion
		   (set-buffer gnus-original-article-buffer)
		   (and (equal (car gnus-original-article) group)
			(eq (cdr gnus-original-article) article))))
	    (insert-buffer-substring gnus-original-article-buffer)
	    'article)
	   ;; Check the backlog.
	   ((and gnus-keep-backlog
		 (gnus-backlog-request-article group article (current-buffer)))
	    'article)
	   ;; Check asynchronous pre-fetch.
	   ((gnus-async-request-fetched-article group article (current-buffer))
	    (gnus-async-prefetch-next group article gnus-summary-buffer)
	    'article)
	   ;; Check the cache.
	   ((and gnus-use-cache
		 (numberp article)
		 (gnus-cache-request-article article group))
	    'article)
	   ;; Get the article and put into the article buffer.
	   ((or (stringp article) (numberp article))
	    (let ((gnus-override-method
		   (and (stringp article) gnus-refer-article-method))
		  (buffer-read-only nil))
	      (erase-buffer)
	      (gnus-kill-all-overlays)
	      (when (gnus-request-article article group (current-buffer))
		(when (numberp article)
		  (gnus-async-prefetch-next group article gnus-summary-buffer)
		  (when gnus-keep-backlog
		    (gnus-backlog-enter-article 
		     group article (current-buffer))))
		'article)))
	   ;; It was a pseudo.
	   (t article)))

      ;; Take the article from the original article buffer
      ;; and place it in the buffer it's supposed to be in.
      (when (and (get-buffer gnus-article-buffer)
		 ;;(numberp article)
		 (equal (buffer-name (current-buffer))
			(buffer-name (get-buffer gnus-article-buffer))))
	(save-excursion
	  (if (get-buffer gnus-original-article-buffer)
	      (set-buffer (get-buffer gnus-original-article-buffer))
	    (set-buffer (get-buffer-create gnus-original-article-buffer))
	    (buffer-disable-undo (current-buffer))
	    (setq major-mode 'gnus-original-article-mode)
	    (setq buffer-read-only t)
	    (gnus-add-current-to-buffer-list))
	  (let (buffer-read-only)
	    (erase-buffer)
	    (insert-buffer-substring gnus-article-buffer))
	  (setq gnus-original-article (cons group article))))
    
      ;; Update sparse articles.
      (when (and do-update-line
		 (or (numberp article)
		     (stringp article)))
	(let ((buf (current-buffer)))
	  (set-buffer gnus-summary-buffer)
	  (gnus-summary-update-article do-update-line)
	  (gnus-summary-goto-subject do-update-line nil t)
	  (set-window-point (get-buffer-window (current-buffer) t)
			    (point))
	  (set-buffer buf))))))

(defun gnus-article-date-ut (&optional type highlight)
  "Convert DATE date to universal time in the current article.
If TYPE is `local', convert to local time; if it is `lapsed', output
how much time has lapsed since DATE."
  (interactive (list 'ut t))
  (let ((headers (or gnus-current-headers (gnus-summary-article-header))))
    (save-excursion
      (set-buffer gnus-article-buffer)
      (article-date-ut type highlight headers))))

;;;
;;; Article editing
;;;

(defvar gnus-article-edit-mode-hook nil
  "*Hook run in article edit mode buffers.")

(defvar gnus-article-edit-mode-map nil)

(unless gnus-article-edit-mode-map 
  (setq gnus-article-edit-mode-map (copy-keymap text-mode-map))

  (gnus-define-keys gnus-article-edit-mode-map
    "\C-c\C-c" 'gnus-summary-edit-article-done)

  (gnus-define-keys (gnus-article-edit-wash-map
		     "\C-c\C-w" gnus-article-edit-mode-map)
    "f" gnus-article-edit-full-stops))

(defun gnus-article-edit-mode ()
  "Major mode for editing articles.
This is an extended text-mode.

\\{gnus-article-edit-mode-map}"
  (interactive)
  (kill-all-local-variables)
  (setq major-mode 'gnus-article-edit-mode)
  (setq mode-name "Article Edit")
  (make-local-variable 'minor-mode-alist)
  (use-local-map gnus-article-edit-mode-map)
  (run-hooks 'text-mode 'gnus-article-edit-mode-hook))

(defun gnus-article-edit-full-stops ()
  "Interactively repair spacing at end of sentences."
  (interactive)
  (save-excursion
    (goto-char (point-min))
    (search-forward-regexp "^$" nil t)
    (let ((case-fold-search nil))
      (query-replace-regexp "\\([.!?][])}]* \\)\\([[({A-Z]\\)" "\\1 \\2"))))

(provide 'gnus-art)

;;; gnus-art.el ends here