1 ;;; mm-util.el --- Utility functions for Mule and low level things
2 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003
3 ;; Free Software Foundation, Inc.
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
6 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to the
21 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
22 ;; Boston, MA 02111-1307, USA.
28 (eval-when-compile (require 'cl))
29 (eval-when-compile (require 'gnus-clfns))
30 (eval-when-compile (require 'static))
37 (let ((nfunc (intern (format "mm-%s" (car elem)))))
38 (if (fboundp (car elem))
39 (defalias nfunc (car elem))
40 (defalias nfunc (cdr elem)))))
41 '((decode-coding-string . (lambda (s a) s))
42 (encode-coding-string . (lambda (s a) s))
43 (encode-coding-region . ignore)
44 (coding-system-list . ignore)
45 (decode-coding-region . ignore)
47 (coding-system-equal . equal)
48 (annotationp . ignore)
49 (set-buffer-file-coding-system . ignore)
51 . (lambda (charset int)
59 (mapcar (lambda (e) (list (symbol-name (car e))))
60 mm-mime-mule-charset-alist)
63 . (lambda (from to string) ;; stolen (and renamed) from nnheader.el
64 "Replace characters in STRING from FROM to TO."
65 (let ((string (substring string 0)) ;Copy string.
68 ;; Replace all occurrences of FROM with TO.
70 (when (= (aref string idx) from)
74 (string-as-unibyte . identity)
75 (string-make-unibyte . identity)
76 (string-as-multibyte . identity)
77 (multibyte-string-p . ignore))))
80 (defalias 'mm-char-or-char-int-p
82 ((fboundp 'char-or-char-int-p) 'char-or-char-int-p)
83 ((fboundp 'char-valid-p) 'char-valid-p)
87 (defalias 'mm-read-coding-system
89 ((fboundp 'read-coding-system)
90 (if (and (featurep 'xemacs)
91 (<= (string-to-number emacs-version) 21.1))
92 (lambda (prompt &optional default-coding-system)
93 (read-coding-system prompt))
95 (t (lambda (prompt &optional default-coding-system)
96 "Prompt the user for a coding system."
98 prompt (mapcar (lambda (s) (list (symbol-name (car s))))
99 mm-mime-mule-charset-alist)))))))
101 (defvar mm-coding-system-list nil)
102 (defun mm-get-coding-system-list ()
103 "Get the coding system list."
104 (or mm-coding-system-list
105 (setq mm-coding-system-list (mm-coding-system-list))))
107 (defun mm-coding-system-p (sym)
108 "Return non-nil if SYM is a coding system."
109 (or (and (fboundp 'coding-system-p) (coding-system-p sym))
110 (memq sym (mm-get-coding-system-list))))
112 (defvar mm-charset-synonym-alist
114 ;; Perfectly fine? A valid MIME name, anyhow.
115 ,@(unless (mm-coding-system-p 'big5)
117 ;; Not in XEmacs, but it's not a proper MIME charset anyhow.
118 ,@(unless (mm-coding-system-p 'x-ctext)
119 '((x-ctext . ctext)))
120 ;; Apparently not defined in Emacs 20, but is a valid MIME name.
121 ,@(unless (mm-coding-system-p 'gb2312)
122 '((gb2312 . cn-gb-2312)))
123 ;; ISO-8859-15 is very similar to ISO-8859-1.
124 ,@(unless (mm-coding-system-p 'iso-8859-15) ; Emacs 21 defines it.
125 '((iso-8859-15 . iso-8859-1)))
126 ;; Windows-1252 is actually a superset of Latin-1. See also
127 ;; `gnus-article-dumbquotes-map'.
128 ,@(unless (mm-coding-system-p 'windows-1252)
129 (if (mm-coding-system-p 'cp1252)
130 '((windows-1252 . cp1252))
131 '((windows-1252 . iso-8859-1))))
132 ;; Windows-1250 is a variant of Latin-2 heavily used by Microsoft
133 ;; Outlook users in Czech republic. Use this to allow reading of their
134 ;; e-mails. cp1250 should be defined by M-x codepage-setup.
135 ,@(if (and (not (mm-coding-system-p 'windows-1250))
136 (mm-coding-system-p 'cp1250))
137 '((windows-1250 . cp1250)))
139 "A mapping from invalid charset names to the real charset names.")
141 (defvar mm-binary-coding-system
143 ((mm-coding-system-p 'binary) 'binary)
144 ((mm-coding-system-p 'no-conversion) 'no-conversion)
146 "100% binary coding system.")
148 (defvar mm-text-coding-system
149 (or (if (memq system-type '(windows-nt ms-dos ms-windows))
150 (and (mm-coding-system-p 'raw-text-dos) 'raw-text-dos)
151 (and (mm-coding-system-p 'raw-text) 'raw-text))
152 mm-binary-coding-system)
153 "Text-safe coding system (For removing ^M).")
155 (defvar mm-text-coding-system-for-write nil
156 "Text coding system for write.")
158 (defvar mm-auto-save-coding-system
160 ((mm-coding-system-p 'emacs-mule)
161 (if (memq system-type '(windows-nt ms-dos ms-windows))
162 (if (mm-coding-system-p 'emacs-mule-dos)
163 'emacs-mule-dos mm-binary-coding-system)
165 ((mm-coding-system-p 'escape-quoted) 'escape-quoted)
166 (t mm-binary-coding-system))
167 "Coding system of auto save file.")
169 (defvar mm-universal-coding-system mm-auto-save-coding-system
170 "The universal coding system.")
172 ;; Fixme: some of the cars here aren't valid MIME charsets. That
173 ;; should only matter with XEmacs, though.
174 (defvar mm-mime-mule-charset-alist
176 (iso-8859-1 latin-iso8859-1)
177 (iso-8859-2 latin-iso8859-2)
178 (iso-8859-3 latin-iso8859-3)
179 (iso-8859-4 latin-iso8859-4)
180 (iso-8859-5 cyrillic-iso8859-5)
181 ;; Non-mule (X)Emacs uses the last mule-charset for 8bit characters.
182 ;; The fake mule-charset, gnus-koi8-r, tells Gnus that the default
183 ;; charset is koi8-r, not iso-8859-5.
184 (koi8-r cyrillic-iso8859-5 gnus-koi8-r)
185 (iso-8859-6 arabic-iso8859-6)
186 (iso-8859-7 greek-iso8859-7)
187 (iso-8859-8 hebrew-iso8859-8)
188 (iso-8859-9 latin-iso8859-9)
189 (iso-8859-14 latin-iso8859-14)
190 (iso-8859-15 latin-iso8859-15)
191 (viscii vietnamese-viscii-lower)
192 (iso-2022-jp latin-jisx0201 japanese-jisx0208 japanese-jisx0208-1978)
193 (euc-kr korean-ksc5601)
194 (gb2312 chinese-gb2312)
195 (big5 chinese-big5-1 chinese-big5-2)
197 (thai-tis620 thai-tis620)
198 (iso-2022-7bit ethiopic arabic-1-column arabic-2-column)
199 (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
200 latin-jisx0201 japanese-jisx0208-1978
201 chinese-gb2312 japanese-jisx0208
202 korean-ksc5601 japanese-jisx0212
204 (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
205 latin-jisx0201 japanese-jisx0208-1978
206 chinese-gb2312 japanese-jisx0208
207 korean-ksc5601 japanese-jisx0212
208 chinese-cns11643-1 chinese-cns11643-2)
209 (iso-2022-int-1 latin-iso8859-1 latin-iso8859-2
210 cyrillic-iso8859-5 greek-iso8859-7
211 latin-jisx0201 japanese-jisx0208-1978
212 chinese-gb2312 japanese-jisx0208
213 korean-ksc5601 japanese-jisx0212
214 chinese-cns11643-1 chinese-cns11643-2
215 chinese-cns11643-3 chinese-cns11643-4
216 chinese-cns11643-5 chinese-cns11643-6
218 ,(if (or (not (fboundp 'charsetp)) ;; non-Mule case
219 (charsetp 'unicode-a)
220 (not (mm-coding-system-p 'mule-utf-8)))
221 '(utf-8 unicode-a unicode-b unicode-c unicode-d unicode-e)
222 ;; If we have utf-8 we're in Mule 5+.
225 (coding-system-get 'mule-utf-8 'safe-charsets)))))
226 "Alist of MIME-charset/MULE-charsets.")
228 ;; Correct by construction, but should be unnecessary:
230 (when (and (not (featurep 'xemacs))
231 (fboundp 'coding-system-list)
232 (fboundp 'sort-coding-systems))
233 (setq mm-mime-mule-charset-alist
238 (when (and (coding-system-get cs 'mime-charset)
239 (not (eq t (coding-system-get cs 'safe-charsets))))
240 (list (cons (coding-system-get cs 'mime-charset)
242 (coding-system-get cs 'safe-charsets))))))
243 (sort-coding-systems (coding-system-list 'base-only))))))
245 (defvar mm-hack-charsets '(iso-8859-15 iso-2022-jp-2)
246 "A list of special charsets.
247 Valid elements include:
248 `iso-8859-15' convert ISO-8859-1, -9 to ISO-8859-15 if ISO-8859-15 exists.
249 `iso-2022-jp-2' convert ISO-2022-jp to ISO-2022-jp-2 if ISO-2022-jp-2 exists."
252 (defvar mm-iso-8859-15-compatible
253 '((iso-8859-1 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE")
254 (iso-8859-9 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE\xD0\xDD\xDE\xF0\xFD\xFE"))
255 "ISO-8859-15 exchangeable coding systems and inconvertible characters.")
257 (defvar mm-iso-8859-x-to-15-table
258 (and (fboundp 'coding-system-p)
259 (mm-coding-system-p 'iso-8859-15)
262 (if (mm-coding-system-p (car cs))
263 (let ((c (string-to-char
264 (decode-coding-string "\341" (car cs)))))
265 (cons (char-charset c)
268 (decode-coding-string "\341" 'iso-8859-15)) c)
269 (string-to-list (decode-coding-string (car (cdr cs))
272 mm-iso-8859-15-compatible))
273 "A table of the difference character between ISO-8859-X and ISO-8859-15.")
275 (defcustom mm-coding-system-priorities
276 (if (boundp 'current-language-environment)
277 (let ((lang (symbol-value 'current-language-environment)))
278 (cond ((string= lang "Japanese")
279 ;; Japanese users may prefer iso-2022-jp to shift-jis.
280 '(iso-2022-jp iso-2022-jp-2 japanese-shift-jis
281 iso-latin-1 utf-8)))))
282 "Preferred coding systems for encoding outgoing mails.
284 More than one suitable coding systems may be found for some texts. By
285 default, a coding system with the highest priority is used to encode
286 outgoing mails (see `sort-coding-systems'). If this variable is set,
287 it overrides the default priority."
288 :type '(repeat (symbol :tag "Coding system"))
291 (defvar mm-use-find-coding-systems-region
292 (fboundp 'find-coding-systems-region)
293 "Use `find-coding-systems-region' to find proper coding systems.
295 Setting it to nil is useful on Emacsen supporting Unicode if sending
296 mail with multiple parts is preferred to sending a Unicode one.")
298 ;;; Internal variables:
302 (defun mm-mule-charset-to-mime-charset (charset)
303 "Return the MIME charset corresponding to the given Mule CHARSET."
304 (if (and (fboundp 'find-coding-systems-for-charsets)
305 (fboundp 'sort-coding-systems))
307 (dolist (cs (sort-coding-systems
309 (find-coding-systems-for-charsets (list charset)))))
312 (setq mime (coding-system-get cs 'mime-charset)))))
314 (let ((alist mm-mime-mule-charset-alist)
317 (when (memq charset (cdar alist))
318 (setq out (caar alist)
323 (defun mm-charset-to-coding-system (charset &optional lbt)
324 "Return coding-system corresponding to CHARSET.
325 CHARSET is a symbol naming a MIME charset.
326 If optional argument LBT (`unix', `dos' or `mac') is specified, it is
327 used as the line break code type of the coding system."
328 (when (stringp charset)
329 (setq charset (intern (downcase charset))))
331 (setq charset (intern (format "%s-%s" charset lbt))))
335 ;; Running in a non-MULE environment.
336 ((null (mm-get-coding-system-list))
339 ((eq charset 'us-ascii)
341 ;; Check to see whether we can handle this charset. (This depends
342 ;; on there being some coding system matching each `mime-charset'
343 ;; property defined, as there should be.)
344 ((and (mm-coding-system-p charset)
345 ;;; Doing this would potentially weed out incorrect charsets.
347 ;;; (eq charset (coding-system-get charset 'mime-charset))
350 ;; Translate invalid charsets.
351 ((let ((cs (cdr (assq charset mm-charset-synonym-alist))))
352 (and cs (mm-coding-system-p cs) cs)))
353 ;; Last resort: search the coding system list for entries which
354 ;; have the right mime-charset in case the canonical name isn't
355 ;; defined (though it should be).
357 ;; mm-get-coding-system-list returns a list of cs without lbt.
359 (dolist (c (mm-get-coding-system-list))
361 (eq charset (coding-system-get c 'mime-charset)))
365 (defsubst mm-replace-chars-in-string (string from to)
366 (mm-subst-char-in-string from to string))
369 (defvar mm-emacs-mule (and (not (featurep 'xemacs))
370 (boundp 'default-enable-multibyte-characters)
371 default-enable-multibyte-characters
372 (fboundp 'set-buffer-multibyte))
375 (defvar mm-mule4-p (and mm-emacs-mule
377 (not (charsetp 'eight-bit-control)))
381 (defun mm-enable-multibyte ()
382 "Set the multibyte flag of the current buffer.
383 Only do this if the default value of `enable-multibyte-characters' is
384 non-nil. This is a no-op in XEmacs."
385 (set-buffer-multibyte t))
386 (defalias 'mm-enable-multibyte 'ignore))
389 (defun mm-disable-multibyte ()
390 "Unset the multibyte flag of in the current buffer.
391 This is a no-op in XEmacs."
392 (set-buffer-multibyte nil))
393 (defalias 'mm-disable-multibyte 'ignore))
396 (defun mm-enable-multibyte-mule4 ()
397 "Enable multibyte in the current buffer.
398 Only used in Emacs Mule 4."
399 (set-buffer-multibyte t))
400 (defalias 'mm-enable-multibyte-mule4 'ignore))
403 (defun mm-disable-multibyte-mule4 ()
404 "Disable multibyte in the current buffer.
405 Only used in Emacs Mule 4."
406 (set-buffer-multibyte nil))
407 (defalias 'mm-disable-multibyte-mule4 'ignore)))
409 (defun mm-preferred-coding-system (charset)
410 ;; A typo in some Emacs versions.
411 (or (get-charset-property charset 'preferred-coding-system)
412 (get-charset-property charset 'prefered-coding-system)))
414 (defsubst mm-guess-charset ()
415 "Guess Mule charset from the language environment."
417 mail-parse-mule-charset ;; cached mule-charset
419 (setq mail-parse-mule-charset
420 (and (boundp 'current-language-environment)
423 (assoc current-language-environment
424 language-info-alist))))))
425 (if (or (not mail-parse-mule-charset)
426 (eq mail-parse-mule-charset 'ascii))
427 (setq mail-parse-mule-charset
428 (or (car (last (assq mail-parse-charset
429 mm-mime-mule-charset-alist)))
432 mail-parse-mule-charset)))
434 (defun mm-charset-after (&optional pos)
435 "Return charset of a character in current buffer at position POS.
436 If POS is nil, it defauls to the current point.
437 If POS is out of range, the value is nil.
438 If the charset is `composition', return the actual one."
439 (let ((char (char-after pos)) charset)
440 (if (< (mm-char-int char) 128)
441 (setq charset 'ascii)
442 ;; charset-after is fake in some Emacsen.
443 (setq charset (and (fboundp 'char-charset) (char-charset char)))
444 (if (eq charset 'composition)
445 (let ((p (or pos (point))))
446 (cadr (find-charset-region p (1+ p))))
447 (if (and charset (not (memq charset '(ascii eight-bit-control
448 eight-bit-graphic))))
450 (mm-guess-charset))))))
452 (defun mm-mime-charset (charset)
453 "Return the MIME charset corresponding to the given Mule CHARSET."
454 (if (eq charset 'unknown)
455 (error "The message contains non-printable characters, please use attachment"))
456 (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
457 ;; This exists in Emacs 20.
459 (and (mm-preferred-coding-system charset)
461 (mm-preferred-coding-system charset) 'mime-charset))
462 (and (eq charset 'ascii)
464 (mm-preferred-coding-system charset)
465 (mm-mule-charset-to-mime-charset charset))
466 ;; This is for XEmacs.
467 (mm-mule-charset-to-mime-charset charset)))
469 (defun mm-delete-duplicates (list)
470 "Simple substitute for CL `delete-duplicates', testing with `equal'."
473 (setq head (car list))
474 (setq list (delete head list))
475 (setq result (cons head result)))
478 (if (and (not (featurep 'xemacs))
479 (boundp 'enable-multibyte-characters))
480 (defalias 'mm-multibyte-p
482 "Say whether multibyte is enabled in the current buffer."
483 enable-multibyte-characters))
484 (defalias 'mm-multibyte-p (lambda () (featurep 'mule))))
486 (defun mm-iso-8859-x-to-15-region (&optional b e)
487 (if (fboundp 'char-charset)
488 (let (charset item c inconvertible)
490 (if e (narrow-to-region b e))
491 (goto-char (point-min))
492 (skip-chars-forward "\0-\177")
495 ((not (setq item (assq (char-charset (setq c (char-after)))
496 mm-iso-8859-x-to-15-table)))
498 ((memq c (cdr (cdr item)))
499 (setq inconvertible t)
502 (insert-before-markers (prog1 (+ c (car (cdr item)))
504 (skip-chars-forward "\0-\177")))
505 (not inconvertible))))
507 (defun mm-sort-coding-systems-predicate (a b)
508 (> (length (memq a mm-coding-system-priorities))
509 (length (memq b mm-coding-system-priorities))))
511 (defun mm-find-mime-charset-region (b e &optional hack-charsets)
512 "Return the MIME charsets needed to encode the region between B and E.
513 nil means ASCII, a single-element list represents an appropriate MIME
514 charset, and a longer list means no appropriate charset."
516 ;; The return possibilities of this function are a mess...
517 (or (and (mm-multibyte-p)
518 mm-use-find-coding-systems-region
519 ;; Find the mime-charset of the most preferred coding
520 ;; system that has one.
521 (let ((systems (find-coding-systems-region b e)))
522 (when mm-coding-system-priorities
524 (sort systems 'mm-sort-coding-systems-predicate)))
525 ;; Fixme: The `mime-charset' (`x-ctext') of `compound-text'
526 ;; is not in the IANA list.
527 (setq systems (delq 'compound-text systems))
528 (unless (equal systems '(undecided))
530 (let ((cs (coding-system-get (pop systems) 'mime-charset)))
533 charsets (list cs))))))
535 ;; Otherwise we're not multibyte, XEmacs or a single coding
536 ;; system won't cover it.
538 (mm-delete-duplicates
539 (mapcar 'mm-mime-charset
541 (mm-find-charset-region b e))))))
542 (if (and (> (length charsets) 1)
543 (memq 'iso-8859-15 charsets)
544 (memq 'iso-8859-15 hack-charsets)
545 (save-excursion (mm-iso-8859-x-to-15-region b e)))
546 (mapcar (lambda (x) (setq charsets (delq (car x) charsets)))
547 mm-iso-8859-15-compatible))
548 (if (and (memq 'iso-2022-jp-2 charsets)
549 (memq 'iso-2022-jp-2 hack-charsets))
550 (setq charsets (delq 'iso-2022-jp charsets)))
553 (defmacro mm-with-unibyte-buffer (&rest forms)
554 "Create a temporary buffer, and evaluate FORMS there like `progn'.
555 Use unibyte mode for this."
556 `(let (default-enable-multibyte-characters)
557 (with-temp-buffer ,@forms)))
558 (put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
559 (put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
561 (defmacro mm-with-unibyte-current-buffer (&rest forms)
562 "Evaluate FORMS with current current buffer temporarily made unibyte.
563 Also bind `default-enable-multibyte-characters' to nil.
564 Equivalent to `progn' in XEmacs"
565 (let ((multibyte (make-symbol "multibyte"))
566 (buffer (make-symbol "buffer")))
568 (let ((,multibyte enable-multibyte-characters)
569 (,buffer (current-buffer)))
571 (let (default-enable-multibyte-characters)
572 (set-buffer-multibyte nil)
575 (set-buffer-multibyte ,multibyte)))
576 (let (default-enable-multibyte-characters)
578 (put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
579 (put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
581 (defmacro mm-with-unibyte-current-buffer-mule4 (&rest forms)
582 "Evaluate FORMS there like `progn' in current buffer.
584 (let ((multibyte (make-symbol "multibyte"))
585 (buffer (make-symbol "buffer")))
587 (let ((,multibyte enable-multibyte-characters)
588 (,buffer (current-buffer)))
590 (let (default-enable-multibyte-characters)
591 (set-buffer-multibyte nil)
594 (set-buffer-multibyte ,multibyte)))
595 (let (default-enable-multibyte-characters)
597 (put 'mm-with-unibyte-current-buffer-mule4 'lisp-indent-function 0)
598 (put 'mm-with-unibyte-current-buffer-mule4 'edebug-form-spec '(body))
600 (defmacro mm-with-unibyte (&rest forms)
601 "Eval the FORMS with the default value of `enable-multibyte-characters' nil, ."
602 `(let (default-enable-multibyte-characters)
604 (put 'mm-with-unibyte 'lisp-indent-function 0)
605 (put 'mm-with-unibyte 'edebug-form-spec '(body))
607 (defun mm-find-charset-region (b e)
608 "Return a list of Emacs charsets in the region B to E."
610 ((and (mm-multibyte-p)
611 (fboundp 'find-charset-region))
612 ;; Remove composition since the base charsets have been included.
613 ;; Remove eight-bit-*, treat them as ascii.
614 (let ((css (find-charset-region b e)))
615 (mapcar (lambda (cs) (setq css (delq cs css)))
616 '(composition eight-bit-control eight-bit-graphic
620 ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
623 (narrow-to-region b e)
624 (goto-char (point-min))
625 (skip-chars-forward "\0-\177")
630 (and (boundp 'current-language-environment)
631 (car (last (assq 'charset
632 (assoc current-language-environment
633 language-info-alist))))))
634 (if (eq charset 'ascii) (setq charset nil))
637 (car (last (assq mail-parse-charset
638 mm-mime-mule-charset-alist)))))
639 (list 'ascii (or charset 'latin-iso8859-1)))))))))
641 (static-if (fboundp 'shell-quote-argument)
642 (defalias 'mm-quote-arg 'shell-quote-argument)
643 (defun mm-quote-arg (arg)
644 "Return a version of ARG that is safe to evaluate in a shell."
645 (let ((pos 0) new-pos accum)
646 ;; *** bug: we don't handle newline characters properly
647 (while (setq new-pos (string-match "[]*[;!'`\"$\\& \t{} |()<>]" arg pos))
648 (push (substring arg pos new-pos) accum)
650 (push (list (aref arg new-pos)) accum)
651 (setq pos (1+ new-pos)))
654 (apply 'concat (nconc (nreverse accum) (list (substring arg pos))))))))
656 (defun mm-auto-mode-alist ()
657 "Return an `auto-mode-alist' with only the .gz (etc) thingies."
658 (let ((alist auto-mode-alist)
661 (when (listp (cdar alist))
662 (push (car alist) out))
666 (defvar mm-inhibit-file-name-handlers
667 '(jka-compr-handler image-file-handler)
668 "A list of handlers doing (un)compression (etc) thingies.")
670 (defun mm-insert-file-contents (filename &optional visit beg end replace
672 "Like `insert-file-contents', q.v., but only reads in the file.
673 A buffer may be modified in several ways after reading into the buffer due
674 to advanced Emacs features, such as file-name-handlers, format decoding,
675 find-file-hooks, etc.
676 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers.
677 This function ensures that none of these modifications will take place."
678 (let ((format-alist nil)
679 (auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
680 (default-major-mode 'fundamental-mode)
681 (enable-local-variables nil)
682 (after-insert-file-functions nil)
683 (enable-local-eval nil)
684 (find-file-hooks nil)
685 (inhibit-file-name-operation (if inhibit
686 'insert-file-contents
687 inhibit-file-name-operation))
688 (inhibit-file-name-handlers
690 (append mm-inhibit-file-name-handlers
691 inhibit-file-name-handlers)
692 inhibit-file-name-handlers)))
693 (insert-file-contents filename visit beg end replace)))
695 (defun mm-append-to-file (start end filename &optional codesys inhibit)
696 "Append the contents of the region to the end of file FILENAME.
697 When called from a function, expects three arguments,
698 START, END and FILENAME. START and END are buffer positions
699 saying what text to write.
700 Optional fourth argument specifies the coding system to use when
702 If INHIBIT is non-nil, inhibit `mm-inhibit-file-name-handlers'."
703 (let ((coding-system-for-write
704 (or codesys mm-text-coding-system-for-write
705 mm-text-coding-system))
706 (inhibit-file-name-operation (if inhibit
708 inhibit-file-name-operation))
709 (inhibit-file-name-handlers
711 (append mm-inhibit-file-name-handlers
712 inhibit-file-name-handlers)
713 inhibit-file-name-handlers)))
714 (append-to-file start end filename)))
716 (defun mm-write-region (start end filename &optional append visit lockname
717 coding-system inhibit)
719 "Like `write-region'.
720 If INHIBIT is non-nil, inhibit `mm-inhibit-file-name-handlers'."
721 (let ((coding-system-for-write
722 (or coding-system mm-text-coding-system-for-write
723 mm-text-coding-system))
724 (inhibit-file-name-operation (if inhibit
726 inhibit-file-name-operation))
727 (inhibit-file-name-handlers
729 (append mm-inhibit-file-name-handlers
730 inhibit-file-name-handlers)
731 inhibit-file-name-handlers)))
732 (write-region start end filename append visit lockname)))
734 (defun mm-image-load-path (&optional package)
736 (dolist (path load-path (nreverse result))
737 (if (file-directory-p
738 (setq dir (concat (file-name-directory
739 (directory-file-name path))
740 "etc/" (or package "gnus/"))))
742 (push path result))))
744 (if (fboundp 'detect-coding-region)
745 (defun mm-detect-coding-region (start end)
746 "Like `detect-coding-region' except returning the best one."
747 (let ((coding-systems
748 (detect-coding-region (point) (point-max))))
749 (or (car-safe coding-systems)
751 (defun mm-detect-coding-region (start end)
752 (let ((point (point)))
754 (skip-chars-forward "\0-\177" end)
756 (if (eq (point) end) 'ascii (mm-guess-charset))
757 (goto-char point)))))
759 (if (fboundp 'coding-system-get)
760 (defun mm-detect-mime-charset-region (start end)
761 "Detect MIME charset of the text in the region between START and END."
762 (let ((cs (mm-detect-coding-region start end)))
763 (coding-system-get cs 'mime-charset)))
764 (defun mm-detect-mime-charset-region (start end)
765 "Detect MIME charset of the text in the region between START and END."
766 (let ((cs (mm-detect-coding-region start end)))
769 (defun mm-guess-mime-charset ()
770 "Guess the default MIME charset from the language environment."
772 (and (boundp 'current-language-environment)
773 (assoc current-language-environment
774 language-info-alist)))
777 ((null language-info)
781 (or (assq 'coding-priority language-info)
782 (assq 'coding-system language-info))))
783 (if (fboundp 'coding-system-get)
784 (or (coding-system-get item 'mime-charset)
787 ((setq item (car (last (assq 'charset language-info))))
790 (mm-mime-charset item)))
794 ;; It is not a MIME function, but some MIME functions use it.
795 (defalias 'mm-make-temp-file
796 (if (fboundp 'make-temp-file)
798 (lambda (prefix &optional dir-flag)
799 (let ((file (expand-file-name
800 (make-temp-name prefix)
801 (if (fboundp 'temp-directory)
803 temporary-file-directory))))
805 (make-directory file))
810 ;;; mm-util.el ends here