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))
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 (device-type . 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-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 (defvar mm-coding-system-priorities nil
275 "Preferred coding systems for encoding outgoing mails.
277 More than one suitable coding systems may be found for some texts. By
278 default, a coding system with the highest priority is used to encode
279 outgoing mails (see `sort-coding-systems'). If this variable is set,
280 it overrides the default priority. For example, Japanese users may
281 prefer iso-2022-jp to japanese-shift-jis:
283 \(setq mm-coding-system-priorities
284 '(iso-2022-jp iso-2022-jp-2 japanese-shift-jis utf-8))
287 (defvar mm-use-find-coding-systems-region
288 (fboundp 'find-coding-systems-region)
289 "Use `find-coding-systems-region' to find proper coding systems.")
291 ;;; Internal variables:
295 (defun mm-mule-charset-to-mime-charset (charset)
296 "Return the MIME charset corresponding to the given Mule CHARSET."
297 (if (fboundp 'find-coding-systems-for-charsets)
299 (dolist (cs (find-coding-systems-for-charsets (list charset)))
302 (setq mime (coding-system-get cs 'mime-charset)))))
304 (let ((alist mm-mime-mule-charset-alist)
307 (when (memq charset (cdar alist))
308 (setq out (caar alist)
313 (defun mm-charset-to-coding-system (charset &optional lbt)
314 "Return coding-system corresponding to CHARSET.
315 CHARSET is a symbol naming a MIME charset.
316 If optional argument LBT (`unix', `dos' or `mac') is specified, it is
317 used as the line break code type of the coding system."
318 (when (stringp charset)
319 (setq charset (intern (downcase charset))))
321 (setq charset (intern (format "%s-%s" charset lbt))))
325 ;; Running in a non-MULE environment.
326 ((null (mm-get-coding-system-list))
329 ((eq charset 'us-ascii)
331 ;; Check to see whether we can handle this charset. (This depends
332 ;; on there being some coding system matching each `mime-charset'
333 ;; property defined, as there should be.)
334 ((and (mm-coding-system-p charset)
335 ;;; Doing this would potentially weed out incorrect charsets.
337 ;;; (eq charset (coding-system-get charset 'mime-charset))
340 ;; Translate invalid charsets.
341 ((let ((cs (cdr (assq charset mm-charset-synonym-alist))))
342 (and cs (mm-coding-system-p cs) cs)))
343 ;; Last resort: search the coding system list for entries which
344 ;; have the right mime-charset in case the canonical name isn't
345 ;; defined (though it should be).
347 ;; mm-get-coding-system-list returns a list of cs without lbt.
349 (dolist (c (mm-get-coding-system-list))
351 (eq charset (coding-system-get c 'mime-charset)))
355 (defsubst mm-replace-chars-in-string (string from to)
356 (mm-subst-char-in-string from to string))
359 (defvar mm-emacs-mule (and (not (featurep 'xemacs))
360 (boundp 'default-enable-multibyte-characters)
361 default-enable-multibyte-characters
362 (fboundp 'set-buffer-multibyte))
365 (defvar mm-mule4-p (and mm-emacs-mule
367 (not (charsetp 'eight-bit-control)))
371 (defun mm-enable-multibyte ()
372 "Set the multibyte flag of the current buffer.
373 Only do this if the default value of `enable-multibyte-characters' is
374 non-nil. This is a no-op in XEmacs."
375 (set-buffer-multibyte t))
376 (defalias 'mm-enable-multibyte 'ignore))
379 (defun mm-disable-multibyte ()
380 "Unset the multibyte flag of in the current buffer.
381 This is a no-op in XEmacs."
382 (set-buffer-multibyte nil))
383 (defalias 'mm-disable-multibyte 'ignore))
386 (defun mm-enable-multibyte-mule4 ()
387 "Enable multibyte in the current buffer.
388 Only used in Emacs Mule 4."
389 (set-buffer-multibyte t))
390 (defalias 'mm-enable-multibyte-mule4 'ignore))
393 (defun mm-disable-multibyte-mule4 ()
394 "Disable multibyte in the current buffer.
395 Only used in Emacs Mule 4."
396 (set-buffer-multibyte nil))
397 (defalias 'mm-disable-multibyte-mule4 'ignore)))
399 (defun mm-preferred-coding-system (charset)
400 ;; A typo in some Emacs versions.
401 (or (get-charset-property charset 'preferred-coding-system)
402 (get-charset-property charset 'prefered-coding-system)))
404 (defsubst mm-guess-charset ()
405 "Guess Mule charset from the language environment."
407 mail-parse-mule-charset ;; cached mule-charset
409 (setq mail-parse-mule-charset
410 (and (boundp 'current-language-environment)
413 (assoc current-language-environment
414 language-info-alist))))))
415 (if (or (not mail-parse-mule-charset)
416 (eq mail-parse-mule-charset 'ascii))
417 (setq mail-parse-mule-charset
418 (or (car (last (assq mail-parse-charset
419 mm-mime-mule-charset-alist)))
422 mail-parse-mule-charset)))
424 (defun mm-charset-after (&optional pos)
425 "Return charset of a character in current buffer at position POS.
426 If POS is nil, it defauls to the current point.
427 If POS is out of range, the value is nil.
428 If the charset is `composition', return the actual one."
429 (let ((char (char-after pos)) charset)
430 (if (< (mm-char-int char) 128)
431 (setq charset 'ascii)
432 ;; charset-after is fake in some Emacsen.
433 (setq charset (and (fboundp 'char-charset) (char-charset char)))
434 (if (eq charset 'composition)
435 (let ((p (or pos (point))))
436 (cadr (find-charset-region p (1+ p))))
437 (if (and charset (not (memq charset '(ascii eight-bit-control
438 eight-bit-graphic))))
440 (mm-guess-charset))))))
442 (defun mm-mime-charset (charset)
443 "Return the MIME charset corresponding to the given Mule CHARSET."
444 (if (eq charset 'unknown)
445 (error "The message contains non-printable characters, please use attachment"))
446 (if (and (fboundp 'coding-system-get) (fboundp 'get-charset-property))
447 ;; This exists in Emacs 20.
449 (and (mm-preferred-coding-system charset)
451 (mm-preferred-coding-system charset) 'mime-charset))
452 (and (eq charset 'ascii)
454 (mm-preferred-coding-system charset)
455 (mm-mule-charset-to-mime-charset charset))
456 ;; This is for XEmacs.
457 (mm-mule-charset-to-mime-charset charset)))
459 (defun mm-delete-duplicates (list)
460 "Simple substitute for CL `delete-duplicates', testing with `equal'."
463 (setq head (car list))
464 (setq list (delete head list))
465 (setq result (cons head result)))
468 (if (and (not (featurep 'xemacs))
469 (boundp 'enable-multibyte-characters))
470 (defalias 'mm-multibyte-p
472 "Say whether multibyte is enabled in the current buffer."
473 enable-multibyte-characters))
474 (defalias 'mm-multibyte-p (lambda () (featurep 'mule))))
476 (defun mm-iso-8859-x-to-15-region (&optional b e)
477 (if (fboundp 'char-charset)
478 (let (charset item c inconvertible)
480 (if e (narrow-to-region b e))
481 (goto-char (point-min))
482 (skip-chars-forward "\0-\177")
485 ((not (setq item (assq (char-charset (setq c (char-after)))
486 mm-iso-8859-x-to-15-table)))
488 ((memq c (cdr (cdr item)))
489 (setq inconvertible t)
492 (insert-before-markers (prog1 (+ c (car (cdr item)))
494 (skip-chars-forward "\0-\177"))))
495 (not inconvertible))))
497 (defun mm-sort-coding-systems-predicate (a b)
498 (> (length (memq a mm-coding-system-priorities))
499 (length (memq b mm-coding-system-priorities))))
501 (defun mm-find-mime-charset-region (b e &optional hack-charsets)
502 "Return the MIME charsets needed to encode the region between B and E.
503 nil means ASCII, a single-element list represents an appropriate MIME
504 charset, and a longer list means no appropriate charset."
506 ;; The return possibilities of this function are a mess...
507 (or (and (mm-multibyte-p)
508 mm-use-find-coding-systems-region
509 ;; Find the mime-charset of the most preferred coding
510 ;; system that has one.
511 (let ((systems (find-coding-systems-region b e)))
512 (when mm-coding-system-priorities
514 (sort systems 'mm-sort-coding-systems-predicate)))
515 ;; Fixme: The `mime-charset' (`x-ctext') of `compound-text'
516 ;; is not in the IANA list.
517 (setq systems (delq 'compound-text systems))
518 (unless (equal systems '(undecided))
520 (let ((cs (coding-system-get (pop systems) 'mime-charset)))
523 charsets (list cs))))))
525 ;; Otherwise we're not multibyte, XEmacs or a single coding
526 ;; system won't cover it.
528 (mm-delete-duplicates
529 (mapcar 'mm-mime-charset
531 (mm-find-charset-region b e))))))
532 (if (and (memq 'iso-8859-15 charsets)
533 (memq 'iso-8859-15 hack-charsets)
534 (save-excursion (mm-iso-8859-x-to-15-region b e)))
535 (mapcar (lambda (x) (setq charsets (delq (car x) charsets)))
536 mm-iso-8859-15-compatible))
537 (if (and (memq 'iso-2022-jp-2 charsets)
538 (memq 'iso-2022-jp-2 hack-charsets))
539 (setq charsets (delq 'iso-2022-jp charsets)))
542 (defmacro mm-with-unibyte-buffer (&rest forms)
543 "Create a temporary buffer, and evaluate FORMS there like `progn'.
544 Use unibyte mode for this."
545 `(let (default-enable-multibyte-characters)
546 (with-temp-buffer ,@forms)))
547 (put 'mm-with-unibyte-buffer 'lisp-indent-function 0)
548 (put 'mm-with-unibyte-buffer 'edebug-form-spec '(body))
550 (defmacro mm-with-unibyte-current-buffer (&rest forms)
551 "Evaluate FORMS with current current buffer temporarily made unibyte.
552 Also bind `default-enable-multibyte-characters' to nil.
553 Equivalent to `progn' in XEmacs"
554 (let ((multibyte (make-symbol "multibyte"))
555 (buffer (make-symbol "buffer")))
557 (let ((,multibyte enable-multibyte-characters)
558 (,buffer (current-buffer)))
560 (let (default-enable-multibyte-characters)
561 (set-buffer-multibyte nil)
564 (set-buffer-multibyte ,multibyte)))
565 (let (default-enable-multibyte-characters)
567 (put 'mm-with-unibyte-current-buffer 'lisp-indent-function 0)
568 (put 'mm-with-unibyte-current-buffer 'edebug-form-spec '(body))
570 (defmacro mm-with-unibyte-current-buffer-mule4 (&rest forms)
571 "Evaluate FORMS there like `progn' in current buffer.
573 (let ((multibyte (make-symbol "multibyte"))
574 (buffer (make-symbol "buffer")))
576 (let ((,multibyte enable-multibyte-characters)
577 (,buffer (current-buffer)))
579 (let (default-enable-multibyte-characters)
580 (set-buffer-multibyte nil)
583 (set-buffer-multibyte ,multibyte)))
584 (let (default-enable-multibyte-characters)
586 (put 'mm-with-unibyte-current-buffer-mule4 'lisp-indent-function 0)
587 (put 'mm-with-unibyte-current-buffer-mule4 'edebug-form-spec '(body))
589 (defmacro mm-with-unibyte (&rest forms)
590 "Eval the FORMS with the default value of `enable-multibyte-characters' nil, ."
591 `(let (default-enable-multibyte-characters)
593 (put 'mm-with-unibyte 'lisp-indent-function 0)
594 (put 'mm-with-unibyte 'edebug-form-spec '(body))
596 (defun mm-find-charset-region (b e)
597 "Return a list of Emacs charsets in the region B to E."
599 ((and (mm-multibyte-p)
600 (fboundp 'find-charset-region))
601 ;; Remove composition since the base charsets have been included.
602 ;; Remove eight-bit-*, treat them as ascii.
603 (let ((css (find-charset-region b e)))
604 (mapcar (lambda (cs) (setq css (delq cs css)))
605 '(composition eight-bit-control eight-bit-graphic
609 ;; We are in a unibyte buffer or XEmacs non-mule, so we futz around a bit.
612 (narrow-to-region b e)
613 (goto-char (point-min))
614 (skip-chars-forward "\0-\177")
619 (and (boundp 'current-language-environment)
620 (car (last (assq 'charset
621 (assoc current-language-environment
622 language-info-alist))))))
623 (if (eq charset 'ascii) (setq charset nil))
626 (car (last (assq mail-parse-charset
627 mm-mime-mule-charset-alist)))))
628 (list 'ascii (or charset 'latin-iso8859-1)))))))))
630 (static-if (fboundp 'shell-quote-argument)
631 (defalias 'mm-quote-arg 'shell-quote-argument)
632 (defun mm-quote-arg (arg)
633 "Return a version of ARG that is safe to evaluate in a shell."
634 (let ((pos 0) new-pos accum)
635 ;; *** bug: we don't handle newline characters properly
636 (while (setq new-pos (string-match "[]*[;!'`\"$\\& \t{} |()<>]" arg pos))
637 (push (substring arg pos new-pos) accum)
639 (push (list (aref arg new-pos)) accum)
640 (setq pos (1+ new-pos)))
643 (apply 'concat (nconc (nreverse accum) (list (substring arg pos))))))))
645 (defun mm-auto-mode-alist ()
646 "Return an `auto-mode-alist' with only the .gz (etc) thingies."
647 (let ((alist auto-mode-alist)
650 (when (listp (cdar alist))
651 (push (car alist) out))
655 (defvar mm-inhibit-file-name-handlers
656 '(jka-compr-handler image-file-handler)
657 "A list of handlers doing (un)compression (etc) thingies.")
659 (defun mm-insert-file-contents (filename &optional visit beg end replace
661 "Like `insert-file-contents', q.v., but only reads in the file.
662 A buffer may be modified in several ways after reading into the buffer due
663 to advanced Emacs features, such as file-name-handlers, format decoding,
664 find-file-hooks, etc.
665 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers.
666 This function ensures that none of these modifications will take place."
667 (let ((format-alist nil)
668 (auto-mode-alist (if inhibit nil (mm-auto-mode-alist)))
669 (default-major-mode 'fundamental-mode)
670 (enable-local-variables nil)
671 (after-insert-file-functions nil)
672 (enable-local-eval nil)
673 (find-file-hooks nil)
674 (inhibit-file-name-operation (if inhibit
675 'insert-file-contents
676 inhibit-file-name-operation))
677 (inhibit-file-name-handlers
679 (append mm-inhibit-file-name-handlers
680 inhibit-file-name-handlers)
681 inhibit-file-name-handlers)))
682 (insert-file-contents filename visit beg end replace)))
684 (defun mm-append-to-file (start end filename &optional codesys inhibit)
685 "Append the contents of the region to the end of file FILENAME.
686 When called from a function, expects three arguments,
687 START, END and FILENAME. START and END are buffer positions
688 saying what text to write.
689 Optional fourth argument specifies the coding system to use when
691 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
692 (let ((coding-system-for-write
693 (or codesys mm-text-coding-system-for-write
694 mm-text-coding-system))
695 (inhibit-file-name-operation (if inhibit
697 inhibit-file-name-operation))
698 (inhibit-file-name-handlers
700 (append mm-inhibit-file-name-handlers
701 inhibit-file-name-handlers)
702 inhibit-file-name-handlers)))
703 (append-to-file start end filename)))
705 (defun mm-write-region (start end filename &optional append visit lockname
706 coding-system inhibit)
708 "Like `write-region'.
709 If INHIBIT is non-nil, inhibit mm-inhibit-file-name-handlers."
710 (let ((coding-system-for-write
711 (or coding-system mm-text-coding-system-for-write
712 mm-text-coding-system))
713 (inhibit-file-name-operation (if inhibit
715 inhibit-file-name-operation))
716 (inhibit-file-name-handlers
718 (append mm-inhibit-file-name-handlers
719 inhibit-file-name-handlers)
720 inhibit-file-name-handlers)))
721 (write-region start end filename append visit lockname)))
723 (defun mm-image-load-path (&optional package)
725 (dolist (path load-path (nreverse result))
726 (if (file-directory-p
727 (setq dir (concat (file-name-directory
728 (directory-file-name path))
729 "etc/" (or package "gnus/"))))
731 (push path result))))
733 (if (fboundp 'detect-coding-region)
734 (defun mm-detect-coding-region (start end)
735 "Like 'detect-coding-region' except returning the best one."
736 (let ((coding-systems
737 (detect-coding-region (point) (point-max))))
738 (or (car-safe coding-systems)
740 (defun mm-detect-coding-region (start end)
741 (let ((point (point)))
743 (skip-chars-forward "\0-\177" end)
745 (if (eq (point) end) 'ascii (mm-guess-charset))
746 (goto-char point)))))
748 (if (fboundp 'coding-system-get)
749 (defun mm-detect-mime-charset-region (start end)
750 "Detect MIME charset of the text in the region between START and END."
751 (let ((cs (mm-detect-coding-region start end)))
752 (coding-system-get cs 'mime-charset)))
753 (defun mm-detect-mime-charset-region (start end)
754 "Detect MIME charset of the text in the region between START and END."
755 (let ((cs (mm-detect-coding-region start end)))
760 ;;; mm-util.el ends here