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1 | ;;; metamail.el --- Metamail interface for GNU Emacs |
2 | ||
f2e3589a | 3 | ;; Copyright (C) 1993, 1996, 2001, 2002, 2003, 2004, |
d7a0267c | 4 | ;; 2005, 2006, 2007 Free Software Foundation, Inc. |
9ed9f36f RS |
5 | |
6 | ;; Author: Masanobu UMEDA <umerin@mse.kyutech.ac.jp> | |
9ed9f36f RS |
7 | ;; Keywords: mail, news, mime, multimedia |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 | 22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
3a35cf56 LK |
23 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
24 | ;; Boston, MA 02110-1301, USA. | |
9ed9f36f RS |
25 | |
26 | ;;; Commentary: | |
27 | ||
e873dcf5 DL |
28 | ;; Note: Metamail does not have all the options which are compatible with |
29 | ;; the environment variables. For that reason, metamail.el has to | |
9ed9f36f RS |
30 | ;; hack the environment variables. In addition, there is no way to |
31 | ;; display all header fields without extra informative body messages | |
e873dcf5 | 32 | ;; which are suppressed by the "-q" option. |
9ed9f36f RS |
33 | |
34 | ;; The idea of using metamail to process MIME messages is from | |
35 | ;; gnus-mime.el by Spike <Spike@world.std.com>. | |
36 | ||
37 | ;;; Code: | |
38 | ||
3675c8b1 JB |
39 | (defvar rmail-current-message) |
40 | (defvar rmail-message-vector) | |
41 | ||
69c1dd37 RS |
42 | (defgroup metamail nil |
43 | "Metamail interface for Emacs." | |
44 | :group 'mail | |
45 | :group 'hypermedia | |
46 | :group 'processes) | |
9ed9f36f | 47 | |
69c1dd37 RS |
48 | (defcustom metamail-program-name "metamail" |
49 | "*Metamail program name." | |
50 | :type 'string | |
51 | :group 'metamail) | |
52 | ||
53 | (defcustom metamail-mailer-name "emacs" | |
54 | "*Mailer name set to MM_MAILER environment variable." | |
55 | :type 'string | |
56 | :group 'metamail) | |
55be1314 RS |
57 | |
58 | (defvar metamail-environment '("KEYHEADS=*" "MM_QUIET=1") | |
9ed9f36f | 59 | "*Environment variables passed to `metamail'. |
55be1314 RS |
60 | It must be a list of strings that have the format ENVVARNAME=VALUE. |
61 | It is not expected to be altered globally by `set' or `setq'. | |
62 | Instead, change its value temporary using `let' or `let*' form.") | |
9ed9f36f | 63 | |
69c1dd37 | 64 | (defcustom metamail-switches '("-x" "-d" "-z") |
9ed9f36f | 65 | "*Switches for `metamail' program. |
55be1314 RS |
66 | `-z' is required to remove zap file. |
67 | It is not expected to be altered globally by `set' or `setq'. | |
68 | Instead, change its value temporary using `let' or `let*' form. | |
69 | `-m MAILER' argument is automatically generated from the | |
69c1dd37 RS |
70 | `metamail-mailer-name' variable." |
71 | :type '(repeat (string :tag "Switch")) | |
72 | :group 'metamail) | |
55be1314 RS |
73 | |
74 | ;;;###autoload | |
75 | (defun metamail-interpret-header () | |
76 | "Interpret a header part of a MIME message in current buffer. | |
77 | Its body part is not interpreted at all." | |
78 | (interactive) | |
79 | (save-excursion | |
80 | (let* ((buffer-read-only nil) | |
81 | (metamail-switches ;Inhibit processing an empty body. | |
82 | (append metamail-switches '("-c" "text/plain" "-E" "7bit"))) | |
83 | (end (progn | |
84 | (goto-char (point-min)) | |
85 | (search-forward "\n\n" nil 'move) | |
86 | ;; An extra newline is inserted by metamail if there | |
87 | ;; is no body part. So, insert a dummy body by | |
88 | ;; itself. | |
89 | (insert "\n") | |
90 | (point)))) | |
91 | (metamail-region (point-min) end nil nil 'nodisplay) | |
92 | ;; Remove an extra newline inserted by myself. | |
93 | (goto-char (point-min)) | |
94 | (if (search-forward "\n\n\n" nil t) | |
95 | (delete-char -1)) | |
96 | ))) | |
9ed9f36f | 97 | |
55be1314 RS |
98 | ;;;###autoload |
99 | (defun metamail-interpret-body (&optional viewmode nodisplay) | |
100 | "Interpret a body part of a MIME message in current buffer. | |
101 | Optional argument VIEWMODE specifies the value of the | |
102 | EMACS_VIEW_MODE environment variable (defaulted to 1). | |
103 | Optional argument NODISPLAY non-nil means buffer is not | |
104 | redisplayed as output is inserted. | |
105 | Its header part is not interpreted at all." | |
106 | (interactive "p") | |
107 | (save-excursion | |
108 | (let ((contype nil) | |
109 | (encoding nil) | |
110 | (end (progn | |
111 | (goto-char (point-min)) | |
112 | (search-forward "\n\n" nil t) | |
113 | (point)))) | |
114 | ;; Find Content-Type and Content-Transfer-Encoding from the header. | |
115 | (save-restriction | |
116 | (narrow-to-region (point-min) end) | |
a1506d29 | 117 | (setq contype |
55be1314 | 118 | (or (mail-fetch-field "Content-Type") "text/plain")) |
a1506d29 | 119 | (setq encoding |
55be1314 RS |
120 | (or (mail-fetch-field "Content-Transfer-Encoding") "7bit"))) |
121 | ;; Interpret the body part only. | |
122 | (let ((metamail-switches ;Process body part only. | |
123 | (append metamail-switches | |
124 | (list "-b" "-c" contype "-E" encoding)))) | |
125 | (metamail-region end (point-max) viewmode nil nodisplay)) | |
126 | ;; Mode specific hack. | |
127 | (cond ((eq major-mode 'rmail-mode) | |
128 | ;; Adjust the marker of this message if in Rmail mode buffer. | |
129 | (set-marker (aref rmail-message-vector (1+ rmail-current-message)) | |
130 | (point-max)))) | |
131 | ))) | |
132 | ||
133 | ;;;###autoload | |
134 | (defun metamail-buffer (&optional viewmode buffer nodisplay) | |
9ed9f36f | 135 | "Process current buffer through `metamail'. |
55be1314 RS |
136 | Optional argument VIEWMODE specifies the value of the |
137 | EMACS_VIEW_MODE environment variable (defaulted to 1). | |
138 | Optional argument BUFFER specifies a buffer to be filled (nil | |
9ed9f36f | 139 | means current). |
55be1314 | 140 | Optional argument NODISPLAY non-nil means buffer is not |
9ed9f36f | 141 | redisplayed as output is inserted." |
55be1314 RS |
142 | (interactive "p") |
143 | (metamail-region (point-min) (point-max) viewmode buffer nodisplay)) | |
9ed9f36f | 144 | |
55be1314 RS |
145 | ;;;###autoload |
146 | (defun metamail-region (beg end &optional viewmode buffer nodisplay) | |
9ed9f36f | 147 | "Process current region through 'metamail'. |
55be1314 RS |
148 | Optional argument VIEWMODE specifies the value of the |
149 | EMACS_VIEW_MODE environment variable (defaulted to 1). | |
150 | Optional argument BUFFER specifies a buffer to be filled (nil | |
9ed9f36f | 151 | means current). |
55be1314 | 152 | Optional argument NODISPLAY non-nil means buffer is not |
9ed9f36f | 153 | redisplayed as output is inserted." |
55be1314 | 154 | (interactive "r\np") |
9ed9f36f RS |
155 | (let ((curbuf (current-buffer)) |
156 | (buffer-read-only nil) | |
767d12f2 | 157 | (metafile (make-temp-file "metamail")) |
55be1314 | 158 | (option-environment |
a1506d29 | 159 | (list (format "EMACS_VIEW_MODE=%d" |
55be1314 | 160 | (if (numberp viewmode) viewmode 1))))) |
9ed9f36f | 161 | (save-excursion |
55be1314 | 162 | ;; Gee! Metamail does not ouput to stdout if input comes from |
9ed9f36f | 163 | ;; stdin. |
5ab5daad | 164 | (let ((selective-display nil)) ;Disable ^M to nl translation. |
55be1314 | 165 | (write-region beg end metafile nil 'nomessage)) |
9ed9f36f RS |
166 | (if buffer |
167 | (set-buffer buffer)) | |
168 | (setq buffer-read-only nil) | |
169 | ;; Clear destination buffer. | |
170 | (if (eq curbuf (current-buffer)) | |
171 | (delete-region beg end) | |
172 | (delete-region (point-min) (point-max))) | |
173 | ;; We have to pass the environment variable KEYHEADS to display | |
174 | ;; all header fields. Metamail should have an optional argument | |
175 | ;; to pass such information directly. | |
176 | (let ((process-environment | |
55be1314 | 177 | (append process-environment |
5ab5daad RS |
178 | metamail-environment option-environment)) |
179 | (coding-system-for-read 'undecided)) | |
9ed9f36f RS |
180 | (apply (function call-process) |
181 | metamail-program-name | |
182 | nil | |
183 | t ;Output to current buffer | |
184 | (not nodisplay) ;Force redisplay | |
55be1314 RS |
185 | (append metamail-switches |
186 | (list "-m" (or metamail-mailer-name "emacs")) | |
187 | (list metafile)))) | |
9ed9f36f RS |
188 | ;; `metamail' may not delete the temporary file! |
189 | (condition-case error | |
190 | (delete-file metafile) | |
191 | (error nil)) | |
192 | ))) | |
193 | ||
9ed9f36f RS |
194 | (provide 'metamail) |
195 | ||
ab5796a9 | 196 | ;;; arch-tag: 52c0cb6f-d800-4776-9789-f0275cb5490e |
9ed9f36f | 197 | ;;; metamail.el ends here |