1 ;;; mm-util.el --- Utility functions for Mule and low level things
2 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002 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))
33 (let ((nfunc (intern (format "mm-%s" (car elem)))))
34 (if (fboundp (car elem))
35 (defalias nfunc (car elem))
36 (defalias nfunc (cdr elem)))))
37 '((decode-coding-string . (lambda (s a) s))
38 (encode-coding-string . (lambda (s a) s))
39 (encode-coding-region . ignore)
40 (coding-system-list . ignore)
41 (decode-coding-region . ignore)
43 (device-type . ignore)
44 (coding-system-equal . equal)
45 (annotationp . ignore)
46 (set-buffer-file-coding-system . ignore)
48 . (lambda (charset int)
56 (mapcar (lambda (e) (list (symbol-name (car e))))
57 mm-mime-mule-charset-alist)
60 . (lambda (from to string) ;; stolen (and renamed) from nnheader.el
61 "Replace characters in STRING from FROM to TO."
62 (let ((string (substring string 0)) ;Copy string.
65 ;; Replace all occurrences of FROM with TO.
67 (when (= (aref string idx) from)
71 (string-as-unibyte . identity)
72 (string-as-multibyte . identity)
73 (multibyte-string-p . ignore))))
76 (defalias 'mm-char-or-char-int-p
78 ((fboundp 'char-or-char-int-p) 'char-or-char-int-p)
79 ((fboundp 'char-valid-p) 'char-valid-p)
83 (defalias 'mm-read-coding-system
85 ((fboundp 'read-coding-system)
86 (if (and (featurep 'xemacs)
87 (<= (string-to-number emacs-version) 21.1))
88 (lambda (prompt &optional default-coding-system)
89 (read-coding-system prompt))
91 (t (lambda (prompt &optional default-coding-system)
92 "Prompt the user for a coding system."
94 prompt (mapcar (lambda (s) (list (symbol-name (car s))))
95 mm-mime-mule-charset-alist)))))))
97 (defvar mm-coding-system-list nil)
98 (defun mm-get-coding-system-list ()
99 "Get the coding system list."
100 (or mm-coding-system-list
101 (setq mm-coding-system-list (mm-coding-system-list))))
103 (defun mm-coding-system-p (sym)
104 "Return non-nil if SYM is a coding system."
105 (or (and (fboundp 'coding-system-p) (coding-system-p sym))
106 (memq sym (mm-get-coding-system-list))))
108 (defvar mm-charset-synonym-alist
110 ;; Perfectly fine? A valid MIME name, anyhow.
111 ,@(unless (mm-coding-system-p 'big5)
113 ;; Not in XEmacs, but it's not a proper MIME charset anyhow.
114 ,@(unless (mm-coding-system-p 'x-ctext)
115 '((x-ctext . ctext)))
116 ;; Apparently not defined in Emacs 20, but is a valid MIME name.
117 ,@(unless (mm-coding-system-p 'gb2312)
118 '((gb2312 . cn-gb-2312)))
119 ;; ISO-8859-15 is very similar to ISO-8859-1.
120 ,@(unless (mm-coding-system-p 'iso-8859-15) ; Emacs 21 defines it.
121 '((iso-8859-15 . iso-8859-1)))
122 ;; Windows-1252 is actually a superset of Latin-1. See also
123 ;; `gnus-article-dumbquotes-map'.
124 ,@(unless (mm-coding-system-p 'windows-1252)
125 (if (mm-coding-system-p 'cp1252)
126 '((windows-1252 . cp1252))
127 '((windows-1252 . iso-8859-1))))
128 ;; Windows-1250 is a variant of Latin-2 heavily used by Microsoft
129 ;; Outlook users in Czech republic. Use this to allow reading of their
130 ;; e-mails. cp1250 should be defined by M-x codepage-setup.
131 ,@(if (and (not (mm-coding-system-p 'windows-1250))
132 (mm-coding-system-p 'cp1250))
133 '((windows-1250 . cp1250)))
135 "A mapping from invalid charset names to the real charset names.")
137 (defvar mm-binary-coding-system
139 ((mm-coding-system-p 'binary) 'binary)
140 ((mm-coding-system-p 'no-conversion) 'no-conversion)
142 "100% binary coding system.")
144 (defvar mm-text-coding-system
145 (or (if (memq system-type '(windows-nt ms-dos ms-windows))
146 (and (mm-coding-system-p 'raw-text-dos) 'raw-text-dos)
147 (and (mm-coding-system-p 'raw-text) 'raw-text))
148 mm-binary-coding-system)
149 "Text-safe coding system (For removing ^M).")
151 (defvar mm-text-coding-system-for-write nil
152 "Text coding system for write.")
154 (defvar mm-auto-save-coding-system
156 ((mm-coding-system-p 'emacs-mule)
157 (if (memq system-type '(windows-nt ms-dos ms-windows))
158 (if (mm-coding-system-p 'emacs-mule-dos)
159 'emacs-mule-dos mm-binary-coding-system)
161 ((mm-coding-system-p 'escape-quoted) 'escape-quoted)
162 (t mm-binary-coding-system))
163 "Coding system of auto save file.")
165 (defvar mm-universal-coding-system mm-auto-save-coding-system
166 "The universal coding system.")
168 ;; Fixme: some of the cars here aren't valid MIME charsets. That
169 ;; should only matter with XEmacs, though.
170 (defvar mm-mime-mule-charset-alist
172 (iso-8859-1 latin-iso8859-1)
173 (iso-8859-2 latin-iso8859-2)
174 (iso-8859-3 latin-iso8859-3)
175 (iso-8859-4 latin-iso8859-4)
176 (iso-8859-5 cyrillic-iso8859-5)
177 ;; Non-mule (X)Emacs uses the last mule-charset for 8bit characters.
178 ;; The fake mule-charset, gnus-koi8-r, tells Gnus that the default
179 ;; charset is koi8-r, not iso-8859-5.
180 (koi8-r cyrillic-iso8859-5 gnus-koi8-r)
181 (iso-8859-6 arabic-iso8859-6)
182 (iso-8859-7 greek-iso8859-7)
183 (iso-8859-8 hebrew-iso8859-8)
184 (iso-8859-9 latin-iso8859-9)
185 (iso-8859-14 latin-iso8859-14)
186 (iso-8859-15 latin-iso8859-15)
187 (viscii vietnamese-viscii-lower)
188 (iso-2022-jp latin-jisx0201 japanese-jisx0208 japanese-jisx0208-1978)
189 (euc-kr korean-ksc5601)
190 (gb2312 chinese-gb2312)
191 (big5 chinese-big5-1 chinese-big5-2)
193 (thai-tis620 thai-tis620)
194 (iso-2022-7bit ethiopic arabic-1-column arabic-2-column)
195 (iso-2022-jp-2 latin-iso8859-1 greek-iso8859-7
196 latin-jisx0201 japanese-jisx0208-1978
197 chinese-gb2312 japanese-jisx0208
198 korean-ksc5601 japanese-jisx0212
200 (iso-2022-int-1 latin-iso8859-1 greek-iso8859-7
201 latin-jisx0201 japanese-jisx0208-1978
202 chinese-gb2312 japanese-jisx0208
203 korean-ksc5601 japanese-jisx0212
204 chinese-cns11643-1 chinese-cns11643-2)
205 (iso-2022-int-1 latin-iso8859-1 latin-iso8859-2
206 cyrillic-iso8859-5 greek-iso8859-7
207 latin-jisx0201 japanese-jisx0208-1978
208 chinese-gb2312 japanese-jisx0208
209 korean-ksc5601 japanese-jisx0212
210 chinese-cns11643-1 chinese-cns11643-2
211 chinese-cns11643-3 chinese-cns11643-4
212 chinese-cns11643-5 chinese-cns11643-6
214 ,(if (or (not (fboundp 'charsetp)) ;; non-Mule case
215 (charsetp 'unicode-a)
216 (not (mm-coding-system-p 'mule-utf-8)))
217 '(utf-8 unicode-a unicode-b unicode-c unicode-d unicode-e)
218 ;; If we have utf-8 we're in Mule 5+.
221 (coding-system-get 'mule-utf-8 'safe-charsets)))))
222 "Alist of MIME-charset/MULE-charsets.")
224 ;; Correct by construction, but should be unnecessary:
226 (when (and (not (featurep 'xemacs))
227 (fboundp 'coding-system-list)
228 (fboundp 'sort-coding-systems))
229 (setq mm-mime-mule-charset-alist
234 (when (and (coding-system-get cs 'mime-charset)
235 (not (eq t (coding-system-get cs 'safe-charsets))))
236 (list (cons (coding-system-get cs 'mime-charset)
238 (coding-system-get cs 'safe-charsets))))))
239 (sort-coding-systems (coding-system-list 'base-only))))))
241 (defvar mm-hack-charsets '(iso-8859-15 iso-2022-jp-2)
242 "A list of special charsets.
243 Valid elements include:
244 `iso-8859-15' convert ISO-8859-1, -9 to ISO-8859-15 if ISO-8859-15 exists.
245 `iso-2022-jp-2' convert ISO-2022-jp to ISO-2022-jp-2 if ISO-2022-jp-2 exists."
248 (defvar mm-iso-8859-15-compatible
249 '((iso-8859-1 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE")
250 (iso-8859-9 "\xA4\xA6\xA8\xB4\xB8\xBC\xBD\xBE\xD0\xDD\xDE\xF0\xFD\xFE"))
251 "ISO-8859-15 exchangeable coding systems and inconvertible characters.")
253 (defvar mm-iso-8859-x-to-15-table
254 (and (fboundp 'coding-system-p)
255 (mm-coding-system-p 'iso-8859-15)
258 (if (mm-coding-system-p (car cs))
259 (let ((c (string-to-char
260 (decode-coding-string "\341" (car cs)))))
261 (cons (char-charset c)
264 (decode-coding-string "\341" 'iso-8859-15)) c)
265 (string-to-list (decode-coding-string (car (cdr cs))
268 mm-iso-8859-15-compatible))
269 "A table of the difference character between ISO-8859-X and ISO-8859-15.")
271 (defvar mm-coding-system-priorities nil
272 "Preferred coding systems for encoding outgoing mails.
274 More than one suitable coding systems may be found for some texts. By
275 default, a coding system with the highest priority is used to encode
276 outgoing mails (see `sort-coding-systems'). If this variable is set,
277 it overrides the default priority. For example, Japanese users may
278 prefer iso-2022-jp to japanese-shift-jis:
280 \(setq mm-coding-system-priorities
281 '(iso-2022-jp iso-2022-jp-2 japanese-shift-jis utf-8))
284 (defvar mm-use-find-coding-systems-region
285 (fboundp 'find-coding-systems-region)
286 "Use `find-coding-systems-region' to find proper coding systems.")
288 ;;; Internal variables:
292 (defun mm-mule-charset-to-mime-charset (charset)
293 "Return the MIME charset corresponding to the given Mule CHARSET."
294 (if (fboundp 'find-coding-systems-for-charsets)
296 (dolist (cs (find-coding-systems-for-charsets (list charset)))
299 (setq mime (coding-system-get cs 'mime-charset)))))
301 (let ((alist mm-mime-mule-charset-alist)
304 (when (memq charset (cdar alist))
305 (setq out (caar alist)
310 (defun mm-charset-to-coding-system (charset &optional lbt)
311 "Return coding-system corresponding to CHARSET.
312 CHARSET is a symbol naming a MIME charset.
313 If optional argument LBT (`unix', `dos' or `mac') is specified, it is
314 used as the line break code type of the coding system."
315 (when (stringp charset)
316 (setq charset (intern (downcase charset))))
318 (setq charset (intern (format "%s-%s" charset lbt))))
322 ;; Running in a non-MULE environment.
323 ((null (mm-get-coding-system-list))
326 ((eq charset 'us-ascii)
328 ;; Check to see whether we can handle this charset. (This depends
329 ;; on there being some coding system matching each `mime-charset'
330 ;; property defined, as there should be.)
331 ((and (mm-coding-system-p charset)
332 ;;; Doing this would potentially weed out incorrect charsets.
334 ;;; (eq charset (coding-system-get charset 'mime-charset))
337 ;; Translate invalid charsets.
338 ((let ((cs (cdr (assq charset mm-charset-synonym-alist))))
339 (and cs (mm-coding-system-p charset) cs)))
340 ;; Last resort: search the coding system list for entries which
341 ;; have the right mime-charset in case the canonical name isn't
342 ;; defined (though it should be).
344 ;; mm-get-coding-system-list returns a list of cs without lbt.
346 (dolist (c (mm-get-coding-system-list))
348 (eq charset (coding-system-get c 'mime-charset)))
352 (defsubst mm-replace-chars-in-string (string from to)
353 (mm-subst-char-in-string from to string))
356 (defvar mm-emacs-mule (and (not (featurep 'xemacs))
357 (boundp 'default-enable-multibyte-characters)
358 default-enable-multibyte-characters
359 (fboundp 'set-buffer-multibyte))
362 (defvar mm-mule4-p (and mm-emacs-mule
364 (not (charsetp 'eight-bit-control)))
368 (defun mm-enable-multibyte ()
369 "Set the multibyte flag of the current buffer.
370 Only do this if the default value of `enable-multibyte-characters' is
371 non-nil. This is a no-op in XEmacs."
372 (set-buffer-multibyte t))
373 (defalias 'mm-enable-multibyte 'ignore))
376 (defun mm-disable-multibyte ()
377 "Unset the multibyte flag of in the current buffer.
378 This is a no-op in XEmacs."
379 (set-buffer-multibyte nil))
380 (defalias 'mm-disable-multibyte 'ignore))
383 (defun mm-enable-multibyte-mule4 ()
384 "Enable multibyte in the current buffer.
385 Only used in Emacs Mule 4."
386 (set-buffer-multibyte t))
387 (defalias 'mm-enable-multibyte-mule4 'ignore))
390 (defun mm-disable-multibyte-mule4 ()
391 "Disable multibyte in the current buffer.
392 Only used in Emacs Mule 4."
393 (set-buffer-multibyte nil))
394 (defalias 'mm-disable-multibyte-mule4 'ignore)))
396 (defun mm-preferred-coding-system (charset)
397 ;; A typo in some Emacs versions.
398 (or (get-charset-property charset 'preferred-coding-system)
399 (get-charset-property charset 'prefered-coding-system)))
401 (defsubst mm-guess-charset ()
402 "Guess Mule charset from the language environment."
404 mail-parse-mule-charset ;; cached mule-charset
406 (setq mail-parse-mule-charset
407 (and (boundp 'current-language-environment)
410 (assoc current-language-environment
411 language-info-alist))))))
412 (if (or (not mail-parse-mule-charset)
413 (eq mail-parse-mule-charset 'ascii))
414 (setq mail-parse-mule-charset
415 (or (car (last (assq mail-parse-charset
416 mm-mime-mule-charset-alist)))
419 mail-parse-mule-charset)))
421 (defun mm-charset-after (&optional pos)
422 "Return charset of a character in current buffer at position POS.
423 If POS is nil, it defauls to the current point.
424 If POS is out of range, the value is nil.
425 If the charset is `composition', return the actual one."
426 (let ((char (char-after pos)) charset)
427 (if (< (mm-char-int char) 128)
428 (setq charset 'ascii)
429 ;; charset-after is fake in some Emacsen.
430 (setq charset (and (fboundp 'char-charset) (char-charset char)))
431 (if (eq charset 'composition)
432 (let ((p (or pos (point))))
433 (cadr (find-charset-region p (1+ p))))
434 (if (and charset (not (memq charset '(ascii eight-bit-control
435 eight-bit-graphic))))
437 (mm-guess-charset))))))
439 (defun mm-mime-charset (charset)
440 "Return the MIME charset corresponding to the given Mule CHARSET."
441 (if (eq charset 'unknown)
442 (error "The message contains non-printable characters, please use attachment"))
443 (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
444 ;; This exists in Emacs 20.
446 (and (mm-preferred-coding-system charset)
448 (mm-preferred-coding-system charset) 'mime-charset))
449 (and (eq charset 'ascii)
451 (mm-preferred-coding-system charset)
452 (mm-mule-charset-to-mime-charset charset))
453 ;; This is for XEmacs.
454 (mm-mule-charset-to-mime-charset charset)))
456 (defun mm-delete-duplicates (list)
457 "Simple substitute for CL `delete-duplicates', testing with `equal'."
460 (setq head (car list))
461 (setq list (delete head list))
462 (setq result (cons head result)))
465 (if (and (not (featurep 'xemacs))
466 (boundp 'enable-multibyte-characters))
467 (defalias 'mm-multibyte-p
469 "Say whether multibyte is enabled in the current buffer."
470 enable-multibyte-characters))
471 (defalias 'mm-multibyte-p (lambda () (featurep 'mule))))
473 (defun mm-iso-8859-x-to-15-region (&optional b e)
474 (if (fboundp 'char-charset)
475 (let (charset item c inconvertible)
477 (if e (narrow-to-region b e))
478 (goto-char (point-min))
479 (skip-chars-forward "\0-\177")
482 ((not (setq item (assq (char-charset (setq c (char-after)))
483 mm-iso-8859-x-to-15-table)))
485 ((memq c (cdr (cdr item)))
486 (setq inconvertible t)
489 (insert-before-markers (prog1 (+ c (car (cdr item)))
491 (skip-chars-forward "\0-\177"))))
492 (not inconvertible))))
494 (defun mm-sort-coding-systems-predicate (a b)
495 (> (length (memq a mm-coding-system-priorities))
496 (length (memq b mm-coding-system-priorities))))
498 (defun mm-find-mime-charset-region (b e &optional hack-charsets)
499 "Return the MIME charsets needed to encode the region between B and E.
500 nil means ASCII, a single-element list represents an appropriate MIME
501 charset, and a longer list means no appropriate charset."
503 ;; The return possibilities of this function are a mess...
504 (or (and (mm-multibyte-p)
505 mm-use-find-coding-systems-region
506 ;; Find the mime-charset of the most preferred coding
507 ;; system that has one.
508 (let ((systems (find-coding-systems-region b e)))
509 (when mm-coding-system-priorities
511 (sort systems 'mm-sort-coding-systems-predicate)))
512 ;; Fixme: The `mime-charset' (`x-ctext') of `compound-text'
513 ;; is not in the IANA list.
514 (setq systems (delq 'compound-text systems))
515 (unless (equal systems '(undecided))
517 (let ((cs (coding-system-get (pop systems) 'mime-charset)))
520 charsets (list cs))))))
522 ;; Otherwise we're not multibyte, XEmacs or a single coding
523 ;; system won't cover it.
525 (mm-delete-duplicates
526 (mapcar 'mm-mime-charset
528 (mm-find-charset-region b e))))))
529 (if (and (memq 'iso-8859-15 charsets)
530 (memq 'iso-8859-15 hack-charsets)
531 (save-excursion (mm-iso-8859-x-to-15-region b e)))
532 (mapcar (lambda (x) (setq charsets (delq (car x) charsets)))
533 mm-iso-8859-15-compatible))
534 (if (and (memq 'iso-2022-jp-2 charsets)
535 (memq 'iso-2022-jp-2 hack-charsets))
536 (setq charsets (delq 'iso-2022-jp charsets)))
539 (defmacro mm-with-unibyte-buffer (&rest forms)
540 "Create a temporary buffer, and evaluate FORMS there like `progn'.
541 Use unibyte mode for this."
542 `(let (default-enable-multibyte-characters)
543 (with-temp-buffer ,@forms)))
544 (put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
545 (put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
547 (defmacro mm-with-unibyte-current-buffer (&rest forms)
548 "Evaluate FORMS with current current buffer temporarily made unibyte.
549 Also bind `default-enable-multibyte-characters' to nil.
550 Equivalent to `progn' in XEmacs"
551 (let ((multibyte (make-symbol "multibyte"))
552 (buffer (make-symbol "buffer")))
554 (let ((,multibyte enable-multibyte-characters)
555 (,buffer (current-buffer)))
557 (let (default-enable-multibyte-characters)
558 (set-buffer-multibyte nil)
561 (set-buffer-multibyte ,multibyte)))
562 (let (default-enable-multibyte-characters)
564 (put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
565 (put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
567 (defmacro mm-with-unibyte-current-buffer-mule4 (&rest forms)
568 "Evaluate FORMS there like `progn' in current buffer.
570 (let ((multibyte (make-symbol "multibyte"))
571 (buffer (make-symbol "buffer")))
573 (let ((,multibyte enable-multibyte-characters)
574 (,buffer (current-buffer)))
576 (let (default-enable-multibyte-characters)
577 (set-buffer-multibyte nil)
580 (set-buffer-multibyte ,multibyte)))
581 (let (default-enable-multibyte-characters)
583 (put 'mm-with-unibyte-current-buffer-mule4 'lisp-indent-function 0)
584 (put 'mm-with-unibyte-current-buffer-mule4 'edebug-form-spec '(body))
586 (defmacro mm-with-unibyte (&rest forms)
587 "Eval the FORMS with the default value of `enable-multibyte-characters' nil, ."
588 `(let (default-enable-multibyte-characters)
590 (put 'mm-with-unibyte 'lisp-indent-function 0)
591 (put 'mm-with-unibyte 'edebug-form-spec '(body))
593 (defun mm-find-charset-region (b e)
594 "Return a list of Emacs charsets in the region B to E."
596 ((and (mm-multibyte-p)
597 (fboundp 'find-charset-region))
598 ;; Remove composition since the base charsets have been included.
599 ;; Remove eight-bit-*, treat them as ascii.
600 (let ((css (find-charset-region b e)))
601 (mapcar (lambda (cs) (setq css (delq cs css)))
602 '(composition eight-bit-control eight-bit-graphic
606 ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
609 (narrow-to-region b e)
610 (goto-char (point-min))
611 (skip-chars-forward "\0-\177")
616 (and (boundp 'current-language-environment)
617 (car (last (assq 'charset
618 (assoc current-language-environment
619 language-info-alist))))))
620 (if (eq charset 'ascii) (setq charset nil))
623 (car (last (assq mail-parse-charset
624 mm-mime-mule-charset-alist)))))
625 (list 'ascii (or charset 'latin-iso8859-1)))))))))
627 (if (fboundp 'shell-quote-argument)
628 (defalias 'mm-quote-arg 'shell-quote-argument)
629 (defun mm-quote-arg (arg)
630 "Return a version of ARG that is safe to evaluate in a shell."
631 (let ((pos 0) new-pos accum)
632 ;; *** bug: we don't handle newline characters properly
633 (while (setq new-pos (string-match "[]*[;!'`\"$\\& \t{} |()<>]" arg pos))
634 (push (substring arg pos new-pos) accum)
636 (push (list (aref arg new-pos)) accum)
637 (setq pos (1+ new-pos)))
640 (apply 'concat (nconc (nreverse accum) (list (substring arg pos))))))))
642 (defun mm-auto-mode-alist ()
643 "Return an `auto-mode-alist' with only the .gz (etc) thingies."
644 (let ((alist auto-mode-alist)
647 (when (listp (cdar alist))
648 (push (car alist) out))
652 (defvar mm-inhibit-file-name-handlers
653 '(jka-compr-handler image-file-handler)
654 "A list of handlers doing (un)compression (etc) thingies.")
656 (defun mm-insert-file-contents (filename &optional visit beg end replace
658 "Like `insert-file-contents', q.v., but only reads in the file.
659 A buffer may be modified in several ways after reading into the buffer due
660 to advanced Emacs features, such as file-name-handlers, format decoding,
661 find-file-hooks, etc.
662 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers.
663 This function ensures that none of these modifications will take place."
664 (let ((format-alist nil)
665 (auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
666 (default-major-mode 'fundamental-mode)
667 (enable-local-variables nil)
668 (after-insert-file-functions nil)
669 (enable-local-eval nil)
670 (find-file-hooks nil)
671 (inhibit-file-name-operation (if inhibit
672 'insert-file-contents
673 inhibit-file-name-operation))
674 (inhibit-file-name-handlers
676 (append mm-inhibit-file-name-handlers
677 inhibit-file-name-handlers)
678 inhibit-file-name-handlers)))
679 (insert-file-contents filename visit beg end replace)))
681 (defun mm-append-to-file (start end filename &optional codesys inhibit)
682 "Append the contents of the region to the end of file FILENAME.
683 When called from a function, expects three arguments,
684 START, END and FILENAME. START and END are buffer positions
685 saying what text to write.
686 Optional fourth argument specifies the coding system to use when
688 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
689 (let ((coding-system-for-write
690 (or codesys mm-text-coding-system-for-write
691 mm-text-coding-system))
692 (inhibit-file-name-operation (if inhibit
694 inhibit-file-name-operation))
695 (inhibit-file-name-handlers
697 (append mm-inhibit-file-name-handlers
698 inhibit-file-name-handlers)
699 inhibit-file-name-handlers)))
700 (append-to-file start end filename)))
702 (defun mm-write-region (start end filename &optional append visit lockname
703 coding-system inhibit)
705 "Like `write-region'.
706 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
707 (let ((coding-system-for-write
708 (or coding-system mm-text-coding-system-for-write
709 mm-text-coding-system))
710 (inhibit-file-name-operation (if inhibit
712 inhibit-file-name-operation))
713 (inhibit-file-name-handlers
715 (append mm-inhibit-file-name-handlers
716 inhibit-file-name-handlers)
717 inhibit-file-name-handlers)))
718 (write-region start end filename append visit lockname)))
720 (defun mm-image-load-path (&optional package)
722 (dolist (path load-path (nreverse result))
723 (if (file-directory-p
724 (setq dir (concat (file-name-directory
725 (directory-file-name path))
726 "etc/" (or package "gnus/"))))
728 (push path result))))
730 (if (fboundp 'detect-coding-region)
731 (defun mm-detect-coding-region (start end)
732 "Like 'detect-coding-region' except returning the best one."
733 (let ((coding-systems
734 (detect-coding-region (point) (point-max))))
735 (or (car-safe coding-systems)
737 (defun mm-detect-coding-region (start end)
738 (let ((point (point)))
740 (skip-chars-forward "\0-\177" end)
742 (if (eq (point) end) 'ascii (mm-guess-charset))
743 (goto-char point)))))
745 (if (fboundp 'coding-system-get)
746 (defun mm-detect-mime-charset-region (start end)
747 "Detect MIME charset of the text in the region between START and END."
748 (let ((cs (mm-detect-coding-region start end)))
749 (coding-system-get cs 'mime-charset)))
750 (defun mm-detect-mime-charset-region (start end)
751 "Detect MIME charset of the text in the region between START and END."
752 (let ((cs (mm-detect-coding-region start end)))
757 ;;; mm-util.el ends here