/usr/share/emacs/site-lisp/w3m/mew-w3m.el is in w3m-el 1.4.569+0.20170110-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2008, 2009, 2010
;; TSUCHIYA Masatoshi <tsuchiya@namazu.org>
;; Author: Shun-ichi GOTO <gotoh@taiyo.co.jp>,
;; Hideyuki SHIRAI <shirai@meadowy.org>
;; Created: Wed Feb 28 03:31:00 2001
;; Version: $Revision: 1.71 $
;; Keywords: Mew, mail, w3m, WWW, hypermedia
;; This file is a part of emacs-w3m.
;; This program 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.
;; This program 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 this program; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; This package is for viewing formatted (rendered) Text/Html content
;; in Mew's message buffer.
;;; Installation:
;; (1) Simply load this file and add followings in your ~/.mew file.
;;
;; (require 'mew-w3m)
;;
;; (2) And you can use keymap of w3m-mode as mew-w3m-minor-mode.
;; To activate this feaeture, add followings also:
;;
;; (setq mew-use-w3m-minor-mode t)
;; (add-hook 'mew-message-hook 'mew-w3m-minor-mode-setter)
;;
;; (3) If you use mew-1.95b118 or later on which Emacs 21, 22 or XEmacs,
;; can display the images in the Text/Html message.
;; To activate this feaeture, add following in your ~/.mew file.
;;
;; (define-key mew-summary-mode-map "T" 'mew-w3m-view-inline-image)
;;
;; Press "T": Toggle the visibility of the images included its message only.
;; Press "C-uT": Display the all images included its Text/Html part."
;;
;; (4) You can use emacs-w3m to fetch and/or browse
;; `external-body with URL access'. To activate this feaeture,
;; add followings also:
;;
;; (setq mew-ext-url-alist
;; '(("^application/" "Fetch by emacs-w3m" mew-w3m-ext-url-fetch nil)
;; (t "Browse by emacs-w3m" mew-w3m-ext-url-show nil)))
;; or
;; (setq mew-ext-url-alist
;; '((t "Browse by emacs-w3m" mew-w3m-ext-url-show nil)))
;;
;;; Usage:
;; There's nothing special. Browse messages in usual way.
;; On viewing Text/Html file, rendered text is appeared in message
;; buffer instead of usual "HTML" banner.
;; C-c C-e operation is also allowed to view with external browser.
;;
;; If mew-use-w3m-minor-mode is t, key operations of w3m-mode is
;; allowed (as minor-mode-map) and jump links in message buffer.
;; NOTE: This feature is not complete. You may confuse.
;;
;;
;;; Code:
(require 'mew)
(require 'w3m)
(eval-when-compile (require 'cl))
;;; initializer for mew
(defgroup mew-w3m nil
"mew-w3m - Inline HTML rendering extension of Mew"
:group 'w3m)
(defcustom mew-use-w3m-minor-mode nil
"*Use w3m minor mode in message buffer.
Non-nil means that the minor mode whose keymap contains keys binded to
some emacs-w3m commands are activated in message buffer, when viewing
Text/Html contents."
:group 'mew-w3m
:type 'boolean)
(defcustom mew-w3m-auto-insert-image nil
"*If non-nil, images are inserted automatically in Multipart/Related message.
This variable is effective only in XEmacs, Emacs 21 and Emacs 22."
:group 'mew-w3m
:type 'boolean)
(defcustom mew-w3m-cid-retrieve-hook nil
"*Hook run after cid retrieved"
:group 'mew-w3m
:type 'hook)
(defcustom mew-w3m-region-cite-mark "> "
"*Method of converting `blockquote'."
:group 'mew-w3m
:type '(choice (const :tag "Use Indent" nil)
(const :tag "Use Cite Mark \"> \"" "> ")
(string :tag "Use Other Mark")))
(defconst mew-w3m-safe-url-regexp "\\`cid:")
;; Avoid bytecompile error and warnings.
(eval-when-compile
(defvar mew-use-text/html)
(unless (fboundp 'mew-current-get-fld)
(autoload 'mew-coding-system-p "mew")
(autoload 'mew-current-get-fld "mew")
(autoload 'mew-current-get-msg "mew")
(autoload 'mew-syntax-get-entry-by-cid "mew")
(defun mew-cache-hit (&rest args) ())))
(defmacro mew-w3m-add-text-properties (props)
`(add-text-properties (point-min)
(min (1+ (point-min)) (point-max))
,props))
(defun mew-w3m-minor-mode-setter ()
"Check message buffer and activate w3m-minor-mode."
(w3m-minor-mode (or (and (get-text-property (point-min) 'w3m)
mew-use-w3m-minor-mode)
0)))
(defvar mew-w3m-use-safe-url-regexp t)
(defun mew-w3m-view-inline-image (&optional allimage)
"Display the images of Text/Html part.
\\<mew-summary-mode-map>
'\\[mew-w3m-view-inline-image]' Toggle display the images included its message only.
'\\[universal-argument]\\[mew-w3m-view-inline-image]' Display the all images included its Text/Html part."
(interactive "P")
(mew-summary-msg-or-part
(if allimage
(let ((mew-use-text/html t)
(mew-w3m-auto-insert-image t)
(mew-w3m-use-safe-url-regexp nil))
(mew-summary-display 'force))
(with-current-buffer (mew-buffer-message)
(let* ((image (get-text-property (point-min) 'w3m-images))
(w3m-display-inline-images image)
(w3m-safe-url-regexp (when mew-w3m-use-safe-url-regexp
mew-w3m-safe-url-regexp)))
(w3m-toggle-inline-images)
(mew-elet
(mew-w3m-add-text-properties `(w3m-images ,(not image)))
(set-buffer-modified-p nil)))))))
(defun mew-w3m-cite-blockquote (&optional inside-blockquote)
"Quote paragraphs in <blockquote>...</blockquote> with the citation mark.
The variable `mew-w3m-region-cite-mark' specifies the citation mark."
(let ((case-fold-search t))
(while (and (re-search-forward "\
\[\t\n ]*<[\t\n ]*blockquote\\(?:[\t\n ]*>\\|[\t\n ]+[^>]+>\\)" nil t)
(w3m-end-of-tag "blockquote" t))
(save-restriction
(narrow-to-region (match-beginning 0) (match-end 0))
(delete-region (goto-char (match-end 3)) (match-end 0))
(insert "\n")
(delete-region (goto-char (point-min)) (match-beginning 3))
(insert "\n")
(while (and (re-search-forward
"<[\t\n ]*pre\\(?:[\t\n ]*>\\|[\t\n ]+[^>]+>\\)" nil t)
(w3m-end-of-tag "pre" t))
(delete-region (goto-char (match-end 2)) (match-end 0))
(if (bolp)
(when (looking-at "\n+") (replace-match ""))
(insert "\n"))
(delete-region (goto-char (match-beginning 0)) (match-beginning 2))
(if (bolp)
(when (looking-at "\n+") (replace-match ""))
(insert "\n")))
(goto-char (point-min))
(mew-w3m-cite-blockquote 'inside-blockquote)
(goto-char (point-min))
(while (re-search-forward
"[\t\n ]*<br\\(?:[\t\n ]*>\\|[\t\n ]+[^>]+>\\)" nil t)
(replace-match "\n"))
(goto-char (point-min))
(while (and (re-search-forward
"[\t\n ]*<div\\(?:[\t\n ]*>\\|[\t\n ]+[^>]+>\\)" nil t)
(w3m-end-of-tag "div"))
(goto-char (match-beginning 0))
(insert "\n")
(goto-char (1+ (match-end 0)))
(insert "\n"))
(goto-char (point-min))
(while (re-search-forward "^[\t <>]+$" nil t)
(replace-match ""))
(goto-char (point-min))
(while (re-search-forward "\n\n\n+" nil t)
(replace-match "\n\n"))
(goto-char (point-min))
(when mew-w3m-region-cite-mark
(goto-char (point-min))
(while (re-search-forward "[^\t\n ]" nil t)
(beginning-of-line)
(if (looking-at "[\t ]+")
(replace-match mew-w3m-region-cite-mark)
(insert mew-w3m-region-cite-mark))
(end-of-line)))
(unless inside-blockquote
; "> > > " --> ">>> "
(when (and mew-w3m-region-cite-mark
(string-match " \\'" mew-w3m-region-cite-mark))
(let ((base (substring mew-w3m-region-cite-mark
0 (match-beginning 0)))
(regexp (regexp-quote mew-w3m-region-cite-mark)))
(setq regexp (concat "^" regexp "\\(?:" regexp "\\)+"))
(goto-char (point-min))
(while (re-search-forward regexp nil t)
(dotimes (i (prog1
(/ (- (match-end 0) (match-beginning 0))
(length mew-w3m-region-cite-mark))
(delete-region (match-beginning 0)
(match-end 0))))
(insert base))
(insert " "))))
(goto-char (point-min))
(insert "<pre>")
(goto-char (point-max))
(insert "</pre>\n"))))))
(defun mew-w3m-region (start end &optional url charset)
"w3m-region with inserting the cite mark."
(if (null mew-w3m-region-cite-mark)
(w3m-region start end url charset)
(save-restriction
(narrow-to-region (goto-char start) end)
(mew-w3m-cite-blockquote)
(w3m-region (point-min) (point-max) url charset)
(goto-char (point-min))
(while (re-search-forward "^[\t ]+$" nil t)
(replace-match ""))
(goto-char (point-min))
(while (re-search-forward "\n\n\n+" nil t)
(replace-match "\n\n"))
(goto-char (point-min))
(skip-chars-forward "\n")
(delete-region (point-min) (point))
(goto-char (point-max))
(skip-chars-backward "\n")
(delete-region (point) (point-max))
(insert "\n"))))
;; processing Text/Html contents with w3m.
(defun mew-mime-text/html-w3m (&rest args)
"View Text/Html contents with w3m rendering output."
(let ((w3m-display-inline-images mew-w3m-auto-insert-image)
(w3m-safe-url-regexp (when mew-w3m-use-safe-url-regexp
mew-w3m-safe-url-regexp))
w3m-force-redisplay ;; don't redraw
charset wcs xref
cache begin end params execute)
(if (= (length args) 2)
;; Mew-2
(setq begin (nth 0 args) end (nth 1 args))
;; Old Mew
(setq cache (nth 0 args))
(setq begin (nth 1 args))
(setq end (nth 2 args))
(setq params (nth 3 args))
(setq execute (nth 4 args)))
(if (and cache (or execute (<= end begin)))
;; 'C-cC-e' + Old Mew
(apply 'mew-mime-text/html (list cache begin end params execute))
(save-excursion
;; search Xref: Header in SHIMBUN article
(when cache (set-buffer cache))
(goto-char (point-min))
(when (re-search-forward mew-eoh nil t)
(let ((eoh (point))
(case-fold-search t))
(goto-char (point-min))
(when (and (re-search-forward "^X-Shimbun-Id: " eoh t)
(goto-char (point-min))
(re-search-forward "^Xref: \\(.+\\)\n" eoh t))
(setq xref (match-string 1))
(w3m-static-if (fboundp 'match-string-no-properties)
(setq xref (match-string-no-properties 1))
(setq xref (match-string 1))
(set-text-properties 0 (length xref) nil xref))))))
(mew-elet
(cond
((and (null cache) (eq w3m-type 'w3m-m17n))
;; Mew-2 + w3m-m17n.
;; Coding-system and charset are decided by Mew.
(let ((w3m-input-coding-system w3m-input-coding-system)
(w3m-output-coding-system w3m-output-coding-system)
(w3m-halfdump-command-arguments w3m-halfdump-command-arguments))
(when (setq charset (mew-charset-guess-region begin end))
(setq wcs (mew-charset-to-cs charset)))
(when (and charset wcs (mew-coding-system-p wcs))
;; guess correctly and not us-ascii
(setq w3m-input-coding-system wcs)
(setq w3m-output-coding-system wcs)
(setq w3m-halfdump-command-arguments
(list "-halfdump"
"-I" charset "-O" charset
"-o" "ext_halfdump=1"
"-o" "pre_conv=1"
"-o" "strict_iso2022=0")))
(mew-w3m-region begin end xref)))
((null cache) ;; Mew-2 + w3m, w3mmee
(mew-w3m-region begin end xref (mew-charset-guess-region begin end)))
(t ;; Old Mew
(setq charset (or (mew-syntax-get-param params "charset")
(with-current-buffer cache
(mew-charset-guess-region begin end))))
(if charset
(setq wcs (mew-charset-to-cs charset))
(setq wcs mew-cs-text-for-write))
(mew-frwlet
mew-cs-dummy wcs
(mew-w3m-region (point)
(progn (insert-buffer-substring cache begin end)
(point))
xref))))
(mew-w3m-add-text-properties `(w3m t w3m-images ,mew-w3m-auto-insert-image))))))
(defvar w3m-mew-support-cid (and (boundp 'mew-version-number)
(fboundp 'mew-syntax-get-entry-by-cid)))
(defun mew-w3m-cid-retrieve (url &rest args)
(let ((output-buffer (current-buffer)))
(with-current-buffer w3m-current-buffer
(when (and w3m-mew-support-cid
(string-match "^cid:\\(.+\\)" url))
(setq url (match-string 1 url))
(let* ((fld (mew-current-get-fld (mew-frame-id)))
(msg (mew-current-get-msg (mew-frame-id)))
(cache (mew-cache-hit fld msg 'must-hit))
(syntax (mew-cache-decode-syntax cache))
cidstx beg end)
(if (string< "4.0.53" mew-version-number)
(setq cidstx (mew-syntax-get-entry-by-cid syntax (concat "<" url ">")))
(setq cidstx (mew-syntax-get-entry-by-cid syntax url)))
(when cidstx
(setq beg (mew-syntax-get-begin cidstx))
(setq end (mew-syntax-get-end cidstx))
(prog1
(with-current-buffer output-buffer
(set-buffer-multibyte t)
(insert-buffer-substring cache beg end)
(set-buffer-multibyte nil)
(downcase (car (mew-syntax-get-ct cidstx))))
(run-hooks 'mew-w3m-cid-retrieve-hook))))))))
(when w3m-mew-support-cid
(push (cons 'mew-message-mode 'mew-w3m-cid-retrieve)
w3m-cid-retrieve-function-alist))
(defun mew-w3m-ext-url-show (dummy url)
(pop-to-buffer (mew-buffer-message))
(w3m url))
(defun mew-w3m-ext-url-fetch (dummy url)
(lexical-let ((url url)
(name (file-name-nondirectory url))
handler)
(w3m-process-do
(success (prog1
(w3m-download url nil nil handler)
(message "Download: %s..." name)))
(if success
(message "Download: %s...done" name)
(message "Download: %s...failed" name))
(sit-for 1))))
(defun w3m-mail-compose-with-mew (source url charset content-type
to subject other-headers)
"Compose a mail using Mew."
(when (one-window-p)
(split-window))
(select-window (next-window))
(condition-case nil
(unless (and (boundp 'mew-init-p) mew-init-p
(progn
(mew-summary-jump-to-draft-buffer)
(and (eq major-mode 'mew-draft-mode)
(y-or-n-p "Attatch this draft? "))))
(mew-user-agent-compose to subject other-headers))
(quit
(if (y-or-n-p "Create new draft? ")
(mew-user-agent-compose to subject other-headers)
(delete-window)
(error "Abort mail composing"))))
(let* ((basename (file-name-nondirectory (w3m-url-strip-query url)))
(ct (downcase content-type))
(mew-attach-move-next-after-copy nil)
(i 1)
(pos -1)
(csorig (mew-charset-to-cs (symbol-name charset)))
last filename cs)
(unless (mew-attach-p)
(mew-draft-prepare-attachments))
;; goto last attachment
(setq last (catch 'last
(while (not (= pos (point)))
(setq i (1+ i))
(mew-attach-goto-number 'here `(,i))
(when (mew-attach-line-lastp)
(throw 'last t)))))
(when (eq csorig mew-cs-unknown)
(setq csorig nil))
(if (or (not last) (not (mew-attach-not-line012-1)))
(message "Can not attach from emacs-w3m here!")
;; Application/.*xml is not inline view with Mew.
(cond
((string= "application/xhtml+xml" ct)
(setq ct "text/html"))
((string-match "^application/.*xml$" ct)
(setq ct "text/xml")))
(setq filename (expand-file-name (cond
((and (string-match "^[\t ]*$" basename)
(string= ct "text/html"))
"index.html")
((and (string-match "^[\t ]*$" basename)
(string= ct "text/xml"))
"index.xml")
((string-match "^[\t ]*$" basename)
"dummy")
(t
basename))
mew-temp-dir))
(with-temp-buffer
(cond
((string= "text/html" ct)
(insert source)
(setq cs (w3m-static-if (fboundp 'mew-text/html-detect-cs)
(mew-text/html-detect-cs (point-min) (point-max))))
(when (or (eq cs mew-cs-unknown) (not cs))
(cond
(csorig
(setq cs csorig))
(t
(setq cs mew-cs-autoconv)))))
((string= "text/xml" ct)
(insert source)
(setq cs (w3m-static-if (fboundp 'mew-text/html-detect-cs)
(mew-text/html-detect-cs (point-min) (point-max))))
(when (or (eq cs mew-cs-unknown) (not cs))
(cond
(csorig
(setq cs csorig))
((mew-coding-system-p 'utf-8)
(setq cs 'utf-8))
(t
(setq cs mew-cs-autoconv)))))
((string-match "^text/" ct)
(insert source)
(setq cs mew-cs-autoconv))
(t
(mew-set-buffer-multibyte nil)
(insert source)
(setq cs mew-cs-binary)))
(setq charset (cond
((eq cs mew-cs-autoconv)
(mew-charset-guess-region (point-min) (point-max)))
((eq cs mew-cs-binary)
nil)
(t
(mew-cs-to-charset cs))))
(mew-frwlet
mew-cs-text-for-read cs
(write-region (point-min) (point-max) filename nil 'nomsg)))
(when ct
(setq ct (mew-capitalize ct)))
(mew-attach-copy filename (file-name-nondirectory filename))
;; content-type check & set
(let* ((nums (mew-syntax-nums))
(syntax (mew-syntax-get-entry mew-encode-syntax nums))
(file (mew-syntax-get-file syntax))
(ctl (mew-syntax-get-ct syntax))
(ct-orig (mew-syntax-get-value ctl 'cap))
cte)
(unless (string= ct ct-orig)
(setq ctl (list ct))
(mew-syntax-set-ct syntax ctl)
(setq cte (mew-ctdb-cte (mew-ctdb-by-ct ct)))
(mew-syntax-set-cte syntax cte)
(mew-syntax-set-cdp syntax (mew-syntax-cdp-format ct file))
(mew-encode-syntax-print mew-encode-syntax)))
;; charset set
(let* ((nums (mew-syntax-nums))
(syntax (mew-syntax-get-entry mew-encode-syntax nums))
(file (mew-syntax-get-file syntax))
(ctl (mew-syntax-get-ct syntax))
(ct (mew-syntax-get-value ctl 'cap))
(params (mew-syntax-get-params ctl))
(ocharset "charset"))
(when (and (string-match "^Text" ct) charset)
(setq params (mew-delete ocharset params))
(setq ctl (cons ct (cons (list ocharset charset) params)))
(mew-syntax-set-ct syntax ctl))
(mew-syntax-set-cd syntax url)
(mew-encode-syntax-print mew-encode-syntax))
(message "Compose a mail using Mew with %s...done" url)
(when (and (file-exists-p filename) (file-writable-p filename))
(delete-file filename)))))
;;;
(provide 'mew-w3m)
;; mew-w3m.el ends here
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