1 ;;; mm-util.el --- Utility functions for Mule and low level things
2 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
5 ;; MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
27 (eval-when-compile (require 'cl))
28 (eval-when-compile (require 'gnus-clfns))
29 (eval-when-compile (require 'static))
36 (let ((nfunc (intern (format "mm-%s" (car elem)))))
37 (if (fboundp (car elem))
38 (defalias nfunc (car elem))
39 (defalias nfunc (cdr elem)))))
40 '((decode-coding-string . (lambda (s a) s))
41 (encode-coding-string . (lambda (s a) s))
42 (encode-coding-region . ignore)
43 (coding-system-list . ignore)
44 (decode-coding-region . ignore)
46 (coding-system-equal . equal)
47 (annotationp . ignore)
48 (set-buffer-file-coding-system . ignore)
50 . (lambda (charset int)
58 (mapcar (lambda (e) (list (symbol-name (car e))))
59 mm-mime-mule-charset-alist)
62 . (lambda (from to string) ;; stolen (and renamed) from nnheader.el
63 "Replace characters in STRING from FROM to TO."
64 (let ((string (substring string 0)) ;Copy string.
67 ;; Replace all occurrences of FROM with TO.
69 (when (= (aref string idx) from)
73 (string-as-unibyte . identity)
74 (string-make-unibyte . identity)
75 (string-as-multibyte . identity)
76 (multibyte-string-p . ignore))))
79 (defalias 'mm-char-or-char-int-p
81 ((fboundp 'char-or-char-int-p) 'char-or-char-int-p)
82 ((fboundp 'char-valid-p) 'char-valid-p)
86 (defalias 'mm-read-coding-system
88 ((fboundp 'read-coding-system)
89 (if (and (featurep 'xemacs)
90 (<= (string-to-number emacs-version) 21.1))
91 (lambda (prompt &optional default-coding-system)
92 (read-coding-system prompt))
94 (t (lambda (prompt &optional default-coding-system)
95 "Prompt the user for a coding system."
97 prompt (mapcar (lambda (s) (list (symbol-name (car s))))
98 mm-mime-mule-charset-alist)))))))
100 (defvar mm-coding-system-list nil)
101 (defun mm-get-coding-system-list ()
102 "Get the coding system list."
103 (or mm-coding-system-list
104 (setq mm-coding-system-list (mm-coding-system-list))))
106 (defun mm-coding-system-p (sym)
107 "Return non-nil if SYM is a coding system."
108 (or (and (fboundp 'coding-system-p) (coding-system-p sym))
109 (memq sym (mm-get-coding-system-list))))
111 (defvar mm-charset-synonym-alist
113 ;; Perfectly fine? A valid MIME name, anyhow.
114 ,@(unless (mm-coding-system-p 'big5)
116 ;; Not in XEmacs, but it's not a proper MIME charset anyhow.
117 ,@(unless (mm-coding-system-p 'x-ctext)
118 '((x-ctext . ctext)))
119 ;; Apparently not defined in Emacs 20, but is a valid MIME name.
120 ,@(unless (mm-coding-system-p 'gb2312)
121 '((gb2312 . cn-gb-2312)))
122 ;; ISO-8859-15 is very similar to ISO-8859-1.
123 ,@(unless (mm-coding-system-p 'iso-8859-15) ; Emacs 21 defines it.
124 '((iso-8859-15 . iso-8859-1)))
125 ;; Windows-1252 is actually a superset of Latin-1. See also
126 ;; `gnus-article-dumbquotes-map'.
127 ,@(unless (mm-coding-system-p 'windows-1252)
128 (if (mm-coding-system-p 'cp1252)
129 '((windows-1252 . cp1252))
130 '((windows-1252 . iso-8859-1))))
131 ;; Windows-1250 is a variant of Latin-2 heavily used by Microsoft
132 ;; Outlook users in Czech republic. Use this to allow reading of their
133 ;; e-mails. cp1250 should be defined by M-x codepage-setup.
134 ,@(if (and (not (mm-coding-system-p 'windows-1250))
135 (mm-coding-system-p 'cp1250))
136 '((windows-1250 . cp1250)))
138 "A mapping from invalid charset names to the real charset names.")
140 (defvar mm-binary-coding-system
142 ((mm-coding-system-p 'binary) 'binary)
143 ((mm-coding-system-p 'no-conversion) 'no-conversion)
145 "100% binary coding system.")
147 (defvar mm-text-coding-system
148 (or (if (memq system-type '(windows-nt ms-dos ms-windows))
149 (and (mm-coding-system-p 'raw-text-dos) 'raw-text-dos)
150 (and (mm-coding-system-p 'raw-text) 'raw-text))
151 mm-binary-coding-system)
152 "Text-safe coding system (For removing ^M).")
154 (defvar mm-text-coding-system-for-write nil
155 "Text coding system for write.")
157 (defvar mm-auto-save-coding-system
159 ((mm-coding-system-p 'emacs-mule)
160 (if (memq system-type '(windows-nt ms-dos ms-windows))
161 (if (mm-coding-system-p 'emacs-mule-dos)
162 'emacs-mule-dos mm-binary-coding-system)
164 ((mm-coding-system-p 'escape-quoted) 'escape-quoted)
165 (t mm-binary-coding-system))
166 "Coding system of auto save file.")
168 (defvar mm-universal-coding-system mm-auto-save-coding-system
169 "The universal coding system.")
171 ;; Fixme: some of the cars here aren't valid MIME charsets. That
172 ;; should only matter with XEmacs, though.
173 (defvar mm-mime-mule-charset-alist
175 (iso-8859-1 latin-iso8859-1)
176 (iso-8859-2 latin-iso8859-2)
177 (iso-8859-3 latin-iso8859-3)
178 (iso-8859-4 latin-iso8859-4)
179 (iso-8859-5 cyrillic-iso8859-5)
180 ;; Non-mule (X)Emacs uses the last mule-charset for 8bit characters.
181 ;; The fake mule-charset, gnus-koi8-r, tells Gnus that the default
182 ;; charset is koi8-r, not iso-8859-5.
183 (koi8-r cyrillic-iso8859-5 gnus-koi8-r)
184 (iso-8859-6 arabic-iso8859-6)
185 (iso-8859-7 greek-iso8859-7)
186 (iso-8859-8 hebrew-iso8859-8)
187 (iso-8859-9 latin-iso8859-9)
188 (iso-8859-14 latin-iso8859-14)
189 (iso-8859-15 latin-iso8859-15)
190 (viscii vietnamese-viscii-lower)
191 (iso-2022-jp latin-jisx0201 japanese-jisx0208 japanese-jisx0208-1978)
192 (euc-kr korean-ksc5601)
193 (gb2312 chinese-gb2312)
194 (big5 chinese-big5-1 chinese-big5-2)
196 (thai-tis620 thai-tis620)
197 (iso-2022-7bit ethiopic arabic-1-column arabic-2-column)
198 (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
199 latin-jisx0201 japanese-jisx0208-1978
200 chinese-gb2312 japanese-jisx0208
201 korean-ksc5601 japanese-jisx0212
203 (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
204 latin-jisx0201 japanese-jisx0208-1978
205 chinese-gb2312 japanese-jisx0208
206 korean-ksc5601 japanese-jisx0212
207 chinese-cns11643-1 chinese-cns11643-2)
208 (iso-2022-int-1 latin-iso8859-1 latin-iso8859-2
209 cyrillic-iso8859-5 greek-iso8859-7
210 latin-jisx0201 japanese-jisx0208-1978
211 chinese-gb2312 japanese-jisx0208
212 korean-ksc5601 japanese-jisx0212
213 chinese-cns11643-1 chinese-cns11643-2
214 chinese-cns11643-3 chinese-cns11643-4
215 chinese-cns11643-5 chinese-cns11643-6
217 ,(if (or (not (fboundp 'charsetp)) ;; non-Mule case
218 (charsetp 'unicode-a)
219 (not (mm-coding-system-p 'mule-utf-8)))
220 '(utf-8 unicode-a unicode-b unicode-c unicode-d unicode-e)
221 ;; If we have utf-8 we're in Mule 5+.
224 (coding-system-get 'mule-utf-8 'safe-charsets)))))
225 "Alist of MIME-charset/MULE-charsets.")
227 ;; Correct by construction, but should be unnecessary:
229 (when (and (not (featurep 'xemacs))
230 (fboundp 'coding-system-list)
231 (fboundp 'sort-coding-systems))
232 (setq mm-mime-mule-charset-alist
237 (when (and (coding-system-get cs 'mime-charset)
238 (not (eq t (coding-system-get cs 'safe-charsets))))
239 (list (cons (coding-system-get cs 'mime-charset)
241 (coding-system-get cs 'safe-charsets))))))
242 (sort-coding-systems (coding-system-list 'base-only))))))
244 (defvar mm-hack-charsets '(iso-8859-15 iso-2022-jp-2)
245 "A list of special charsets.
246 Valid elements include:
247 `iso-8859-15' convert ISO-8859-1, -9 to ISO-8859-15 if ISO-8859-15 exists.
248 `iso-2022-jp-2' convert ISO-2022-jp to ISO-2022-jp-2 if ISO-2022-jp-2 exists."
251 (defvar mm-iso-8859-15-compatible
252 '((iso-8859-1 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE")
253 (iso-8859-9 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE\xD0\xDD\xDE\xF0\xFD\xFE"))
254 "ISO-8859-15 exchangeable coding systems and inconvertible characters.")
256 (defvar mm-iso-8859-x-to-15-table
257 (and (fboundp 'coding-system-p)
258 (mm-coding-system-p 'iso-8859-15)
261 (if (mm-coding-system-p (car cs))
262 (let ((c (string-to-char
263 (decode-coding-string "\341" (car cs)))))
264 (cons (char-charset c)
267 (decode-coding-string "\341" 'iso-8859-15)) c)
268 (string-to-list (decode-coding-string (car (cdr cs))
271 mm-iso-8859-15-compatible))
272 "A table of the difference character between ISO-8859-X and ISO-8859-15.")
274 (defcustom mm-coding-system-priorities
275 (if (boundp 'current-language-environment)
276 (let ((lang (symbol-value 'current-language-environment)))
277 (cond ((string= lang "Japanese")
278 ;; Japanese users may prefer iso-2022-jp to shift-jis.
279 '(iso-2022-jp iso-2022-jp-2 japanese-shift-jis
280 iso-latin-1 utf-8)))))
281 "Preferred coding systems for encoding outgoing mails.
283 More than one suitable coding systems may be found for some texts. By
284 default, a coding system with the highest priority is used to encode
285 outgoing mails (see `sort-coding-systems'). If this variable is set,
286 it overrides the default priority."
287 :type '(repeat (symbol :tag "Coding system"))
290 (defvar mm-use-find-coding-systems-region
291 (fboundp 'find-coding-systems-region)
292 "Use `find-coding-systems-region' to find proper coding systems.
294 Setting it to nil is useful on Emacsen supporting Unicode if sending
295 mail with multiple parts is preferred to sending a Unicode one.")
297 ;;; Internal variables:
301 (defun mm-mule-charset-to-mime-charset (charset)
302 "Return the MIME charset corresponding to the given Mule CHARSET."
303 (if (fboundp 'find-coding-systems-for-charsets)
305 (dolist (cs (find-coding-systems-for-charsets (list charset)))
308 (setq mime (coding-system-get cs 'mime-charset)))))
310 (let ((alist mm-mime-mule-charset-alist)
313 (when (memq charset (cdar alist))
314 (setq out (caar alist)
319 (defun mm-charset-to-coding-system (charset &optional lbt)
320 "Return coding-system corresponding to CHARSET.
321 CHARSET is a symbol naming a MIME charset.
322 If optional argument LBT (`unix', `dos' or `mac') is specified, it is
323 used as the line break code type of the coding system."
324 (when (stringp charset)
325 (setq charset (intern (downcase charset))))
327 (setq charset (intern (format "%s-%s" charset lbt))))
331 ;; Running in a non-MULE environment.
332 ((null (mm-get-coding-system-list))
335 ((eq charset 'us-ascii)
337 ;; Check to see whether we can handle this charset. (This depends
338 ;; on there being some coding system matching each `mime-charset'
339 ;; property defined, as there should be.)
340 ((and (mm-coding-system-p charset)
341 ;;; Doing this would potentially weed out incorrect charsets.
343 ;;; (eq charset (coding-system-get charset 'mime-charset))
346 ;; Translate invalid charsets.
347 ((let ((cs (cdr (assq charset mm-charset-synonym-alist))))
348 (and cs (mm-coding-system-p cs) cs)))
349 ;; Last resort: search the coding system list for entries which
350 ;; have the right mime-charset in case the canonical name isn't
351 ;; defined (though it should be).
353 ;; mm-get-coding-system-list returns a list of cs without lbt.
355 (dolist (c (mm-get-coding-system-list))
357 (eq charset (coding-system-get c 'mime-charset)))
361 (defsubst mm-replace-chars-in-string (string from to)
362 (mm-subst-char-in-string from to string))
365 (defvar mm-emacs-mule (and (not (featurep 'xemacs))
366 (boundp 'default-enable-multibyte-characters)
367 default-enable-multibyte-characters
368 (fboundp 'set-buffer-multibyte))
371 (defvar mm-mule4-p (and mm-emacs-mule
373 (not (charsetp 'eight-bit-control)))
377 (defun mm-enable-multibyte ()
378 "Set the multibyte flag of the current buffer.
379 Only do this if the default value of `enable-multibyte-characters' is
380 non-nil. This is a no-op in XEmacs."
381 (set-buffer-multibyte t))
382 (defalias 'mm-enable-multibyte 'ignore))
385 (defun mm-disable-multibyte ()
386 "Unset the multibyte flag of in the current buffer.
387 This is a no-op in XEmacs."
388 (set-buffer-multibyte nil))
389 (defalias 'mm-disable-multibyte 'ignore))
392 (defun mm-enable-multibyte-mule4 ()
393 "Enable multibyte in the current buffer.
394 Only used in Emacs Mule 4."
395 (set-buffer-multibyte t))
396 (defalias 'mm-enable-multibyte-mule4 'ignore))
399 (defun mm-disable-multibyte-mule4 ()
400 "Disable multibyte in the current buffer.
401 Only used in Emacs Mule 4."
402 (set-buffer-multibyte nil))
403 (defalias 'mm-disable-multibyte-mule4 'ignore)))
405 (defun mm-preferred-coding-system (charset)
406 ;; A typo in some Emacs versions.
407 (or (get-charset-property charset 'preferred-coding-system)
408 (get-charset-property charset 'prefered-coding-system)))
410 (defsubst mm-guess-charset ()
411 "Guess Mule charset from the language environment."
413 mail-parse-mule-charset ;; cached mule-charset
415 (setq mail-parse-mule-charset
416 (and (boundp 'current-language-environment)
419 (assoc current-language-environment
420 language-info-alist))))))
421 (if (or (not mail-parse-mule-charset)
422 (eq mail-parse-mule-charset 'ascii))
423 (setq mail-parse-mule-charset
424 (or (car (last (assq mail-parse-charset
425 mm-mime-mule-charset-alist)))
428 mail-parse-mule-charset)))
430 (defun mm-charset-after (&optional pos)
431 "Return charset of a character in current buffer at position POS.
432 If POS is nil, it defauls to the current point.
433 If POS is out of range, the value is nil.
434 If the charset is `composition', return the actual one."
435 (let ((char (char-after pos)) charset)
436 (if (< (mm-char-int char) 128)
437 (setq charset 'ascii)
438 ;; charset-after is fake in some Emacsen.
439 (setq charset (and (fboundp 'char-charset) (char-charset char)))
440 (if (eq charset 'composition)
441 (let ((p (or pos (point))))
442 (cadr (find-charset-region p (1+ p))))
443 (if (and charset (not (memq charset '(ascii eight-bit-control
444 eight-bit-graphic))))
446 (mm-guess-charset))))))
448 (defun mm-mime-charset (charset)
449 "Return the MIME charset corresponding to the given Mule CHARSET."
450 (if (eq charset 'unknown)
451 (error "The message contains non-printable characters, please use attachment"))
452 (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
453 ;; This exists in Emacs 20.
455 (and (mm-preferred-coding-system charset)
457 (mm-preferred-coding-system charset) 'mime-charset))
458 (and (eq charset 'ascii)
460 (mm-preferred-coding-system charset)
461 (mm-mule-charset-to-mime-charset charset))
462 ;; This is for XEmacs.
463 (mm-mule-charset-to-mime-charset charset)))
465 (defun mm-delete-duplicates (list)
466 "Simple substitute for CL `delete-duplicates', testing with `equal'."
469 (setq head (car list))
470 (setq list (delete head list))
471 (setq result (cons head result)))
474 (if (and (not (featurep 'xemacs))
475 (boundp 'enable-multibyte-characters))
476 (defalias 'mm-multibyte-p
478 "Say whether multibyte is enabled in the current buffer."
479 enable-multibyte-characters))
480 (defalias 'mm-multibyte-p (lambda () (featurep 'mule))))
482 (defun mm-iso-8859-x-to-15-region (&optional b e)
483 (if (fboundp 'char-charset)
484 (let (charset item c inconvertible)
486 (if e (narrow-to-region b e))
487 (goto-char (point-min))
488 (skip-chars-forward "\0-\177")
491 ((not (setq item (assq (char-charset (setq c (char-after)))
492 mm-iso-8859-x-to-15-table)))
494 ((memq c (cdr (cdr item)))
495 (setq inconvertible t)
498 (insert-before-markers (prog1 (+ c (car (cdr item)))
500 (skip-chars-forward "\0-\177"))))
501 (not inconvertible))))
503 (defun mm-sort-coding-systems-predicate (a b)
504 (> (length (memq a mm-coding-system-priorities))
505 (length (memq b mm-coding-system-priorities))))
507 (defun mm-find-mime-charset-region (b e &optional hack-charsets)
508 "Return the MIME charsets needed to encode the region between B and E.
509 nil means ASCII, a single-element list represents an appropriate MIME
510 charset, and a longer list means no appropriate charset."
512 ;; The return possibilities of this function are a mess...
513 (or (and (mm-multibyte-p)
514 mm-use-find-coding-systems-region
515 ;; Find the mime-charset of the most preferred coding
516 ;; system that has one.
517 (let ((systems (find-coding-systems-region b e)))
518 (when mm-coding-system-priorities
520 (sort systems 'mm-sort-coding-systems-predicate)))
521 ;; Fixme: The `mime-charset' (`x-ctext') of `compound-text'
522 ;; is not in the IANA list.
523 (setq systems (delq 'compound-text systems))
524 (unless (equal systems '(undecided))
526 (let ((cs (coding-system-get (pop systems) 'mime-charset)))
529 charsets (list cs))))))
531 ;; Otherwise we're not multibyte, XEmacs or a single coding
532 ;; system won't cover it.
534 (mm-delete-duplicates
535 (mapcar 'mm-mime-charset
537 (mm-find-charset-region b e))))))
538 (if (and (memq 'iso-8859-15 charsets)
539 (memq 'iso-8859-15 hack-charsets)
540 (save-excursion (mm-iso-8859-x-to-15-region b e)))
541 (mapcar (lambda (x) (setq charsets (delq (car x) charsets)))
542 mm-iso-8859-15-compatible))
543 (if (and (memq 'iso-2022-jp-2 charsets)
544 (memq 'iso-2022-jp-2 hack-charsets))
545 (setq charsets (delq 'iso-2022-jp charsets)))
548 (defmacro mm-with-unibyte-buffer (&rest forms)
549 "Create a temporary buffer, and evaluate FORMS there like `progn'.
550 Use unibyte mode for this."
551 `(let (default-enable-multibyte-characters)
552 (with-temp-buffer ,@forms)))
553 (put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
554 (put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
556 (defmacro mm-with-unibyte-current-buffer (&rest forms)
557 "Evaluate FORMS with current current buffer temporarily made unibyte.
558 Also bind `default-enable-multibyte-characters' to nil.
559 Equivalent to `progn' in XEmacs"
560 (let ((multibyte (make-symbol "multibyte"))
561 (buffer (make-symbol "buffer")))
563 (let ((,multibyte enable-multibyte-characters)
564 (,buffer (current-buffer)))
566 (let (default-enable-multibyte-characters)
567 (set-buffer-multibyte nil)
570 (set-buffer-multibyte ,multibyte)))
571 (let (default-enable-multibyte-characters)
573 (put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
574 (put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
576 (defmacro mm-with-unibyte-current-buffer-mule4 (&rest forms)
577 "Evaluate FORMS there like `progn' in current buffer.
579 (let ((multibyte (make-symbol "multibyte"))
580 (buffer (make-symbol "buffer")))
582 (let ((,multibyte enable-multibyte-characters)
583 (,buffer (current-buffer)))
585 (let (default-enable-multibyte-characters)
586 (set-buffer-multibyte nil)
589 (set-buffer-multibyte ,multibyte)))
590 (let (default-enable-multibyte-characters)
592 (put 'mm-with-unibyte-current-buffer-mule4 'lisp-indent-function 0)
593 (put 'mm-with-unibyte-current-buffer-mule4 'edebug-form-spec '(body))
595 (defmacro mm-with-unibyte (&rest forms)
596 "Eval the FORMS with the default value of `enable-multibyte-characters' nil, ."
597 `(let (default-enable-multibyte-characters)
599 (put 'mm-with-unibyte 'lisp-indent-function 0)
600 (put 'mm-with-unibyte 'edebug-form-spec '(body))
602 (defun mm-find-charset-region (b e)
603 "Return a list of Emacs charsets in the region B to E."
605 ((and (mm-multibyte-p)
606 (fboundp 'find-charset-region))
607 ;; Remove composition since the base charsets have been included.
608 ;; Remove eight-bit-*, treat them as ascii.
609 (let ((css (find-charset-region b e)))
610 (mapcar (lambda (cs) (setq css (delq cs css)))
611 '(composition eight-bit-control eight-bit-graphic
615 ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
618 (narrow-to-region b e)
619 (goto-char (point-min))
620 (skip-chars-forward "\0-\177")
625 (and (boundp 'current-language-environment)
626 (car (last (assq 'charset
627 (assoc current-language-environment
628 language-info-alist))))))
629 (if (eq charset 'ascii) (setq charset nil))
632 (car (last (assq mail-parse-charset
633 mm-mime-mule-charset-alist)))))
634 (list 'ascii (or charset 'latin-iso8859-1)))))))))
636 (static-if (fboundp 'shell-quote-argument)
637 (defalias 'mm-quote-arg 'shell-quote-argument)
638 (defun mm-quote-arg (arg)
639 "Return a version of ARG that is safe to evaluate in a shell."
640 (let ((pos 0) new-pos accum)
641 ;; *** bug: we don't handle newline characters properly
642 (while (setq new-pos (string-match "[]*[;!'`\"$\\& \t{} |()<>]" arg pos))
643 (push (substring arg pos new-pos) accum)
645 (push (list (aref arg new-pos)) accum)
646 (setq pos (1+ new-pos)))
649 (apply 'concat (nconc (nreverse accum) (list (substring arg pos))))))))
651 (defun mm-auto-mode-alist ()
652 "Return an `auto-mode-alist' with only the .gz (etc) thingies."
653 (let ((alist auto-mode-alist)
656 (when (listp (cdar alist))
657 (push (car alist) out))
661 (defvar mm-inhibit-file-name-handlers
662 '(jka-compr-handler image-file-handler)
663 "A list of handlers doing (un)compression (etc) thingies.")
665 (defun mm-insert-file-contents (filename &optional visit beg end replace
667 "Like `insert-file-contents', q.v., but only reads in the file.
668 A buffer may be modified in several ways after reading into the buffer due
669 to advanced Emacs features, such as file-name-handlers, format decoding,
670 find-file-hooks, etc.
671 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers.
672 This function ensures that none of these modifications will take place."
673 (let ((format-alist nil)
674 (auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
675 (default-major-mode 'fundamental-mode)
676 (enable-local-variables nil)
677 (after-insert-file-functions nil)
678 (enable-local-eval nil)
679 (find-file-hooks nil)
680 (inhibit-file-name-operation (if inhibit
681 'insert-file-contents
682 inhibit-file-name-operation))
683 (inhibit-file-name-handlers
685 (append mm-inhibit-file-name-handlers
686 inhibit-file-name-handlers)
687 inhibit-file-name-handlers)))
688 (insert-file-contents filename visit beg end replace)))
690 (defun mm-append-to-file (start end filename &optional codesys inhibit)
691 "Append the contents of the region to the end of file FILENAME.
692 When called from a function, expects three arguments,
693 START, END and FILENAME. START and END are buffer positions
694 saying what text to write.
695 Optional fourth argument specifies the coding system to use when
697 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
698 (let ((coding-system-for-write
699 (or codesys mm-text-coding-system-for-write
700 mm-text-coding-system))
701 (inhibit-file-name-operation (if inhibit
703 inhibit-file-name-operation))
704 (inhibit-file-name-handlers
706 (append mm-inhibit-file-name-handlers
707 inhibit-file-name-handlers)
708 inhibit-file-name-handlers)))
709 (append-to-file start end filename)))
711 (defun mm-write-region (start end filename &optional append visit lockname
712 coding-system inhibit)
714 "Like `write-region'.
715 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
716 (let ((coding-system-for-write
717 (or coding-system mm-text-coding-system-for-write
718 mm-text-coding-system))
719 (inhibit-file-name-operation (if inhibit
721 inhibit-file-name-operation))
722 (inhibit-file-name-handlers
724 (append mm-inhibit-file-name-handlers
725 inhibit-file-name-handlers)
726 inhibit-file-name-handlers)))
727 (write-region start end filename append visit lockname)))
729 (defun mm-image-load-path (&optional package)
731 (dolist (path load-path (nreverse result))
732 (if (file-directory-p
733 (setq dir (concat (file-name-directory
734 (directory-file-name path))
735 "etc/" (or package "gnus/"))))
737 (push path result))))
739 (if (fboundp 'detect-coding-region)
740 (defun mm-detect-coding-region (start end)
741 "Like 'detect-coding-region' except returning the best one."
742 (let ((coding-systems
743 (detect-coding-region (point) (point-max))))
744 (or (car-safe coding-systems)
746 (defun mm-detect-coding-region (start end)
747 (let ((point (point)))
749 (skip-chars-forward "\0-\177" end)
751 (if (eq (point) end) 'ascii (mm-guess-charset))
752 (goto-char point)))))
754 (if (fboundp 'coding-system-get)
755 (defun mm-detect-mime-charset-region (start end)
756 "Detect MIME charset of the text in the region between START and END."
757 (let ((cs (mm-detect-coding-region start end)))
758 (coding-system-get cs 'mime-charset)))
759 (defun mm-detect-mime-charset-region (start end)
760 "Detect MIME charset of the text in the region between START and END."
761 (let ((cs (mm-detect-coding-region start end)))
764 (defun mm-guess-mime-charset ()
765 "Guess the default MIME charset from the language environment."
767 (and (boundp 'current-language-environment)
768 (assoc current-language-environment
769 language-info-alist)))
772 ((null language-info)
776 (or (assq 'coding-priority language-info)
777 (assq 'coding-system language-info))))
778 (if (fboundp 'coding-system-get)
779 (or (coding-system-get item 'mime-charset)
782 ((setq item (car (last (assq 'charset language-info))))
785 (mm-mime-charset item)))
789 ;; It is not a MIME function, but some MIME functions use it.
790 (defalias 'mm-make-temp-file
791 (if (fboundp 'make-temp-file)
793 (lambda (prefix &optional dir-flag)
794 (let ((file (expand-file-name
795 (make-temp-name prefix)
796 (if (fboundp 'temp-directory)
798 temporary-file-directory))))
800 (make-directory file))
805 ;;; mm-util.el ends here