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3fdc9c8f | 1 | ;;; gnus-mule.el --- Provide multilingual environment to GNUS |
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2 | |
3 | ;; Copyright (C) 1995 Free Software Foundation, Inc. | |
4 | ;; Copyright (C) 1995 Electrotechnical Laboratory, JAPAN. | |
5 | ||
6 | ;; Keywords: gnus, mule | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
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21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
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24 | |
25 | ;;; Commentary: | |
26 | ||
27 | ;; This package enables GNUS to code convert automatically | |
28 | ;; accoding to a coding system specified for each news group. | |
29 | ;; Please put the following line in your .emacs: | |
30 | ;; (add-hook 'gnus-startup-hook 'gnus-mule-initialize) | |
31 | ;; If you want to specify some coding system for a specific news | |
32 | ;; group, add the fllowing line in your .emacs: | |
33 | ;; (gnus-mule-add-group "xxx.yyy.zzz" 'some-coding-system) | |
34 | ;; | |
35 | ;; Decoding of summary buffer is not yet implemented. | |
36 | ||
37 | (require 'gnus) | |
38 | ||
39 | (defvar gnus-newsgroup-coding-systems nil | |
40 | "Assoc list of news groups vs corresponding coding systems. | |
41 | Each element is a list of news group name and cons of coding systems | |
42 | for reading and posting.") | |
43 | ||
44 | ;;;###autoload | |
45 | (defun gnus-mule-add-group (name coding-system) | |
46 | "Specify that articles of news group NAME are encoded in CODING-SYSTEM. | |
47 | All news groups deeper than NAME are also the target. | |
48 | If CODING-SYSTEM is a cons, the car and cdr part are regarded as | |
49 | coding-system for reading and writing respectively." | |
50 | (if (not (consp coding-system)) | |
51 | (setq coding-system (cons coding-system coding-system))) | |
52 | (setq name (concat "^" (regexp-quote name))) | |
53 | (let ((group (assoc name gnus-newsgroup-coding-systems))) | |
54 | (if group | |
55 | (setcdr group coding-system) | |
56 | (setq gnus-newsgroup-coding-systems | |
57 | (cons (cons name coding-system) gnus-newsgroup-coding-systems))))) | |
58 | ||
59 | (defun gnus-mule-get-coding-system (group) | |
60 | "Return the coding system for news group GROUP." | |
61 | (let ((groups gnus-newsgroup-coding-systems) | |
62 | (len -1) | |
63 | coding-system) | |
64 | ;; Find an entry which matches GROUP the best (i.e. longest). | |
65 | (while groups | |
66 | (if (and (string-match (car (car groups)) group) | |
67 | (> (match-end 0) len)) | |
68 | (setq len (match-end 0) | |
69 | coding-system (cdr (car groups)))) | |
70 | (setq groups (cdr groups))) | |
71 | coding-system)) | |
72 | ||
73 | ;; Flag to indicate if article buffer is already decoded or not.") | |
74 | (defvar gnus-mule-article-decoded nil) | |
75 | ;; Codingsystem for reading articles of the current news group. | |
76 | (defvar gnus-mule-coding-system nil) | |
77 | (defvar gnus-mule-subject nil) | |
78 | (defvar gnus-mule-decoded-subject nil) | |
79 | (defvar gnus-mule-original-subject nil) | |
80 | ||
81 | ;; Encode (if ENCODING is t) or decode (if ENCODING is nil) the | |
82 | ;; region from START to END by CODING-SYSTEM. | |
83 | (defun gnus-mule-code-convert1 (start end coding-system encoding) | |
84 | (if (< start end) | |
85 | (save-excursion | |
86 | (if encoding | |
87 | (encode-coding-region start end coding-system) | |
88 | (decode-coding-region start end coding-system))))) | |
89 | ||
90 | ;; Encode (if ENCODING is t) or decode (if ENCODING is nil) the | |
91 | ;; current buffer by CODING-SYSTEM. Try not to move positions of | |
92 | ;; (window-start) and (point). | |
93 | (defun gnus-mule-code-convert (coding-system encoding) | |
94 | (if coding-system | |
95 | (let ((win (get-buffer-window (current-buffer)))) | |
96 | (if win | |
97 | ;; We should keep (point) and (window-start). | |
98 | (save-window-excursion | |
99 | (select-window win) | |
100 | (if encoding | |
101 | ;; Simple way to assure point is on valid character boundary. | |
102 | (beginning-of-line)) | |
103 | (gnus-mule-code-convert1 (point-min) (window-start) | |
104 | coding-system encoding) | |
105 | (gnus-mule-code-convert1 (window-start) (point) | |
106 | coding-system encoding) | |
107 | (gnus-mule-code-convert1 (point) (point-max) | |
108 | coding-system encoding) | |
109 | (if (not (pos-visible-in-window-p)) | |
110 | ;; point went out of window, move to the bottom of window. | |
111 | (move-to-window-line -1))) | |
112 | ;; No window for the buffer, no need to worry about (point) | |
113 | ;; and (windos-start). | |
114 | (gnus-mule-code-convert1 (point-min) (point-max) | |
115 | coding-system encoding)) | |
116 | ))) | |
117 | ||
118 | ;; Set `gnus-mule-coding-system' to the coding system articles of the | |
119 | ;; current news group is encoded. This function is set in | |
120 | ;; `gnus-select-group-hook'. | |
121 | (defun gnus-mule-select-coding-system () | |
122 | (let ((coding-system (gnus-mule-get-coding-system gnus-newsgroup-name))) | |
123 | (setq gnus-mule-coding-system | |
124 | (if (and coding-system (coding-system-p (car coding-system))) | |
125 | (car coding-system))))) | |
126 | ||
127 | ;; Decode the current article. This function is set in | |
128 | ;; `gnus-article-prepare-hook'. | |
129 | (defun gnus-mule-decode-article () | |
130 | (gnus-mule-code-convert gnus-mule-coding-system nil) | |
131 | (setq gnus-mule-article-decoded t)) | |
132 | ||
133 | ;; Decode the current summary buffer. This function is set in | |
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134 | ;; `gnus-summary-generate-hook'. |
135 | ;; Made by <sangil@hugsvr.kaist.ac.kr>, | |
136 | ;; coded by <crisp@hugsvr.kaist.ac.kr>. | |
4ed46869 | 137 | (defun gnus-mule-decode-summary () |
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138 | (if gnus-mule-coding-system |
139 | (mapcar | |
140 | (lambda (headers) | |
141 | (let ((subject (aref headers 1)) | |
142 | (author (aref headers 2))) | |
143 | (aset headers 1 | |
144 | (decode-coding-string subject gnus-mule-coding-system)) | |
145 | (aset headers 2 | |
146 | (decode-coding-string author gnus-mule-coding-system)))) | |
147 | gnus-newsgroup-headers))) | |
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148 | |
149 | (defun gnus-mule-toggle-article-format () | |
150 | "Toggle decoding/encoding of the current article buffer." | |
151 | (interactive) | |
152 | (let ((buf (get-buffer gnus-article-buffer))) | |
153 | (if (and gnus-mule-coding-system buf) | |
154 | (save-excursion | |
155 | (set-buffer buf) | |
156 | (let ((modif (buffer-modified-p)) | |
157 | buffer-read-only) | |
158 | (gnus-mule-code-convert gnus-mule-coding-system | |
159 | gnus-mule-article-decoded) | |
160 | (setq gnus-mule-article-decoded (not gnus-mule-article-decoded)) | |
161 | (set-buffer-modified-p modif)))))) | |
162 | ||
163 | ;;;###autoload | |
164 | (defun gnus-mule-initialize () | |
165 | "Do several settings for GNUS to enable automatic code conversion." | |
166 | ;; Convenient key definitions | |
167 | (define-key gnus-article-mode-map "z" 'gnus-mule-toggle-article-format) | |
168 | (define-key gnus-summary-mode-map "z" 'gnus-mule-toggle-article-format) | |
169 | ;; Hook definition | |
170 | (add-hook 'gnus-select-group-hook 'gnus-mule-select-coding-system) | |
a1a45cd2 | 171 | (add-hook 'gnus-summary-generate-hook 'gnus-mule-decode-summary) |
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172 | (add-hook 'gnus-article-prepare-hook 'gnus-mule-decode-article)) |
173 | ||
a1a45cd2 | 174 | (gnus-mule-add-group "" 'iso-2022-7) ;; default coding system |
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175 | (gnus-mule-add-group "alt" 'no-conversion) |
176 | (gnus-mule-add-group "comp" 'no-conversion) | |
177 | (gnus-mule-add-group "gnu" 'no-conversion) | |
178 | (gnus-mule-add-group "rec" 'no-conversion) | |
179 | (gnus-mule-add-group "sci" 'no-conversion) | |
180 | (gnus-mule-add-group "soc" 'no-conversion) | |
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181 | (gnus-mule-add-group "alt.chinese.text" 'hz-gb-2312) |
182 | (gnus-mule-add-group "alt.hk" 'hz-gb-2312) | |
183 | (gnus-mule-add-group "alt.chinese.text.big5" 'cn-big5) | |
184 | (gnus-mule-add-group "soc.culture.vietnamese" '(nil . viqr)) | |
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185 | |
186 | (add-hook 'gnus-startup-hook 'gnus-mule-initialize) | |
187 | ||
188 | ;; gnus-mule.el ends here |