1 ;;; code-files.el --- File I/O functions for XEmacs.
3 ;; Copyright (C) 1992,93,94,95 Free Software Foundation, Inc.
4 ;; Copyright (C) 1995 Amdahl Corporation.
5 ;; Copyright (C) 1995 Sun Microsystems.
7 ;; This file is part of XEmacs.
9 ;; XEmacs is free software; you can redistribute it and/or modify it
10 ;; 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 ;; XEmacs is distributed in the hope that it will be useful, but
15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 ;; General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with XEmacs; 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.
24 ;;; Synched up with: Not synched.
28 ;; Derived from mule.el in the original Mule but heavily modified
31 ;; 1997/3/11 modified by MORIOKA Tomohiko to sync with Emacs 20 API.
33 ;; This file was derived from the former mule-files.el which has been removed
34 ;; as of XEmacs 21.2.15.
38 (setq-default buffer-file-coding-system 'no-conversion)
39 (put 'buffer-file-coding-system 'permanent-local t)
41 (define-obsolete-variable-alias
43 'buffer-file-coding-system)
45 (define-obsolete-variable-alias
46 'overriding-file-coding-system
47 'coding-system-for-read)
49 (defvar buffer-file-coding-system-for-read 'undecided
50 "Coding system used when reading a file.
51 This provides coarse-grained control; for finer-grained control, use
52 `file-coding-system-alist'. From a Lisp program, if you wish to
53 unilaterally specify the coding system used for one particular
54 operation, you should bind the variable `coding-system-for-read'
55 rather than setting this variable, which is intended to be used for
56 global environment specification.")
58 (define-obsolete-variable-alias
59 'file-coding-system-for-read
60 'buffer-file-coding-system-for-read)
62 (defvar file-coding-system-alist
64 ;; This must not be necessary, slb suggests -kkm
65 ;; ("loaddefs.el$" . (binary . binary))
67 #'(lambda (regexp) (cons regexp 'binary)) binary-file-regexps)
68 ("TUTORIAL\\.\\(?:hr\\|pl\\|ro\\)\\'" . iso-8859-2)
69 ;; ("\\.\\(el\\|emacs\\|info\\(-[0-9]+\\)?\\|texi\\)$" . iso-2022-8)
70 ;; ("\\(ChangeLog\\|CHANGES-beta\\)$" . iso-2022-8)
71 ("/spool/mail/.*$" . convert-mbox-coding-system))
72 "Alist to decide a coding system to use for a file I/O operation.
73 The format is ((PATTERN . VAL) ...),
74 where PATTERN is a regular expression matching a file name,
75 VAL is a coding system, a cons of coding systems, or a function symbol.
76 If VAL is a coding system, it is used for both decoding and encoding
78 If VAL is a cons of coding systems, the car part is used for decoding,
79 and the cdr part is used for encoding.
80 If VAL is a function symbol, the function must return a coding system
81 or a cons of coding systems which are used as above.
83 This overrides the more general specification in
84 `buffer-file-coding-system-for-read', but is overridden by
85 `coding-system-for-read'.")
87 (defun set-buffer-file-coding-system (coding-system &optional force)
88 "Set buffer-file-coding-system of the current buffer to CODING-SYSTEM.
89 If optional argument FORCE (interactively, the prefix argument) is not
90 given, attempt to match the EOL type of the new coding system to
91 the current value of `buffer-file-coding-system'."
92 (interactive "zFile coding system: \nP")
93 (get-coding-system coding-system) ;; correctness check
96 (subsidiary-coding-system
98 (coding-system-eol-type buffer-file-coding-system))))
99 (setq buffer-file-coding-system coding-system)
102 (defun toggle-buffer-file-coding-system ()
103 "Set EOL type of buffer-file-coding-system of the current buffer to
104 something other than what it is at the moment."
107 (coding-system-eol-type buffer-file-coding-system)))
108 (setq buffer-file-coding-system
109 (subsidiary-coding-system
110 (coding-system-base buffer-file-coding-system)
111 (cond ((eq eol-type 'lf) 'crlf)
112 ((eq eol-type 'crlf) 'lf)
113 ((eq eol-type 'cr) 'lf))))))
115 (define-obsolete-function-alias
116 'set-file-coding-system
117 'set-buffer-file-coding-system)
119 (defun set-buffer-file-coding-system-for-read (coding-system)
120 "Set the coding system used when reading in a file.
121 This is equivalent to setting the variable
122 `buffer-file-coding-system-for-read'. You can also use
123 `file-coding-system-alist' to specify the coding system for
125 (interactive "zFile coding system for read: ")
126 (get-coding-system coding-system) ;; correctness check
127 (setq buffer-file-coding-system-for-read coding-system))
129 (define-obsolete-function-alias
130 'set-file-coding-system-for-read
131 'set-buffer-file-coding-system-for-read)
133 (defun set-default-buffer-file-coding-system (coding-system)
134 "Set the default value of `buffer-file-coding-system' to CODING-SYSTEM.
135 The default value is used both for buffers without associated files
136 and for files with no apparent coding system (i.e. primarily ASCII).
137 See `buffer-file-coding-system' for more information."
138 (interactive "zDefault file coding system: ")
139 (setq-default buffer-file-coding-system coding-system)
142 (define-obsolete-function-alias
143 'set-default-file-coding-system
144 'set-default-buffer-file-coding-system)
146 (defun find-file-coding-system-for-read-from-filename (filename)
147 "Look up coding system to read a file in `file-coding-system-alist'.
148 The return value will be nil (no applicable entry) or a coding system
149 object (the entry specified a coding system)."
150 (let ((alist file-coding-system-alist)
153 (let ((case-fold-search nil))
154 (setq filename (file-name-sans-versions filename))
155 (while (and (not found) alist)
156 (if (string-match (car (car alist)) filename)
157 (setq codesys (cdr (car alist))
159 (setq alist (cdr alist))))
161 (if (functionp codesys)
162 (setq codesys (funcall codesys 'insert-file-contents filename))
164 (cond ((consp codesys) (find-coding-system (car codesys)))
165 ((find-coding-system codesys))
168 (define-obsolete-function-alias
169 'find-file-coding-system-from-filename
170 'find-file-coding-system-for-read-from-filename)
172 (defun find-file-coding-system-for-write-from-filename (filename)
173 "Look up coding system to write a file in `file-coding-system-alist'.
174 The return value will be nil (no applicable entry) or a coding system
175 object (the entry specified a coding system)."
176 (let ((alist file-coding-system-alist)
179 (let ((case-fold-search nil))
180 (setq filename (file-name-sans-versions filename))
181 (while (and (not found) alist)
182 (if (string-match (car (car alist)) filename)
183 (setq codesys (cdr (car alist))
185 (setq alist (cdr alist))))
187 (if (functionp codesys)
188 (setq codesys (funcall codesys 'write-region filename))
190 (cond ((consp codesys) (find-coding-system (cdr codesys)))
191 ((find-coding-system codesys))
194 (defun convert-mbox-coding-system (filename visit start end)
195 "Decoding function for Unix mailboxes.
196 Does separate detection and decoding on each message, since each
197 message might be in a different encoding."
198 (let ((buffer-read-only nil))
200 (narrow-to-region start end)
201 (goto-char (point-min))
203 (let ((start (point))
206 (if (re-search-forward "^From" nil 'move)
209 (decode-coding-region start end 'undecided))))))
211 (defun find-coding-system-magic-cookie ()
212 "Look for the coding-system magic cookie in the current buffer.\n"
213 "The coding-system magic cookie is the exact string\n"
214 "\";;;###coding system: \" followed by a valid coding system symbol,\n"
215 "somewhere within the first 3000 characters of the file. If found,\n"
216 "the coding system symbol is returned; otherwise nil is returned.\n"
217 "Note that it is extremely unlikely that such a string would occur\n"
218 "coincidentally as the result of encoding some characters in a non-ASCII\n"
219 "charset, and that the spaces make it even less likely since the space\n"
220 "character is not a valid octet in any ISO 2022 encoding of most non-ASCII\n"
223 (goto-char (point-min))
225 "^[^\n]*-\\*-[^\n]*coding: \\([^ \t\n;]+\\)[^\n]*-\\*-")
226 (let ((codesys (intern (buffer-substring
227 (match-beginning 1)(match-end 1)))))
228 (if (find-coding-system codesys) codesys)))
231 ;; (and (re-search-forward "^;+[ \t]*Local Variables:" nil t)
232 ;; (setq start (match-end 0))
233 ;; (re-search-forward "\n;+[ \t]*End:")
234 ;; (setq end (match-beginning 0))
236 ;; (narrow-to-region start end)
238 ;; (re-search-forward "^;;; coding: \\([^\n]+\\)$" nil t)
241 ;; (intern (buffer-substring
242 ;; (match-beginning 1)(match-end 1)))))
243 ;; (if (find-coding-system codesys) codesys))
245 (let ((case-fold-search nil))
247 ";;;###coding system: " (+ (point-min) 3000) t)
248 (let ((start (point))
250 (skip-chars-forward "^ \t\n\r")
253 (let ((codesys (intern (buffer-substring start end))))
254 (if (find-coding-system codesys) codesys)))
258 (defun load (file &optional noerror nomessage nosuffix)
259 "Execute a file of Lisp code named FILE.
260 First tries FILE with .elc appended, then tries with .el,
261 then tries FILE unmodified. Searches directories in load-path.
262 If optional second arg NOERROR is non-nil,
263 report no error if FILE doesn't exist.
264 Print messages at start and end of loading unless
265 optional third arg NOMESSAGE is non-nil.
266 If optional fourth arg NOSUFFIX is non-nil, don't try adding
267 suffixes .elc or .el to the specified name FILE.
268 Return t if file exists."
269 (let* ((filename (substitute-in-file-name file))
270 (handler (find-file-name-handler filename 'load))
273 (funcall handler 'load filename noerror nomessage nosuffix)
274 (if (or (<= (length filename) 0)
276 (locate-file filename load-path
277 (and (not nosuffix) '(".elc" ".el" ""))))))
279 (signal 'file-error (list "Cannot open load file" filename)))
280 ;; now use the internal load to actually load the file.
282 file noerror nomessage nosuffix
283 (let ((elc ; use string= instead of string-match to keep match-data.
284 (string= ".elc" (downcase (substring path -4)))))
285 (or (and (not elc) coding-system-for-read) ; prefer for source file
288 (set-buffer (get-buffer-create " *load*"))
290 (let ((coding-system-for-read 'no-conversion))
291 (insert-file-contents path nil 1 3001))
292 (find-coding-system-magic-cookie))
294 ;; if reading a byte-compiled file and we didn't find
295 ;; a coding-system magic cookie, then use `binary'.
296 ;; We need to guarantee that we never do autodetection
297 ;; on byte-compiled files because confusion here would
298 ;; be a very bad thing. Pre-existing byte-compiled
299 ;; files are always in the `binary' coding system.
300 ;; Also, byte-compiled files always use `lf' to terminate
301 ;; a line; don't risk confusion here either.
303 (or (find-file-coding-system-for-read-from-filename path)
304 ;; looking up in `file-coding-system-alist'.
305 ;; otherwise use `buffer-file-coding-system-for-read',
307 buffer-file-coding-system-for-read)
311 (defvar insert-file-contents-access-hook nil
312 "A hook to make a file accessible before reading it.
313 `insert-file-contents' calls this hook before doing anything else.
314 Called with two arguments: FILENAME and VISIT, the same as the
315 corresponding arguments in the call to `insert-file-contents'.")
317 (defvar insert-file-contents-pre-hook nil
318 "A special hook to decide the coding system used for reading in a file.
320 Before reading a file, `insert-file-contents' calls the functions on
321 this hook with arguments FILENAME and VISIT, the same as the
322 corresponding arguments in the call to `insert-file-contents'. In
323 these functions, you may refer to the global variable
324 `buffer-file-coding-system-for-read'.
326 The return value of the functions should be either
329 -- A coding system or a symbol denoting it, indicating the coding system
330 to be used for reading the file
331 -- A list of two elements (absolute pathname and length of data inserted),
332 which is used as the return value to `insert-file-contents'. In this
333 case, `insert-file-contents' assumes that the function has inserted
334 the file for itself and suppresses further reading.
336 If any function returns non-nil, the remaining functions are not called.")
338 (defvar insert-file-contents-error-hook nil
339 "A hook to set `buffer-file-coding-system' when a read error has occurred.
341 When a file error (e.g. nonexistent file) occurs while read a file,
342 `insert-file-contents' calls the functions on this hook with three
343 arguments: FILENAME and VISIT (the same as the corresponding arguments
344 in the call to `insert-file-contents') and a cons (SIGNALED-CONDITIONS
347 After calling this hook, the error is signalled for real and
348 propagates to the caller of `insert-file-contents'.")
350 (defvar insert-file-contents-post-hook nil
351 "A hook to set `buffer-file-coding-system' for the current buffer.
353 After successful reading, `insert-file-contents' calls the functions
354 on this hook with four arguments: FILENAME and VISIT (the same as the
355 corresponding arguments in the call to `insert-file-contents'),
356 CODING-SYSTEM (the actual coding system used to decode the file), and
357 a cons of absolute pathname and length of data inserted (the same
358 thing as will be returned from `insert-file-contents').")
360 (defun insert-file-contents (filename &optional visit beg end replace)
361 "Insert contents of file FILENAME after point.
362 Returns list of absolute file name and length of data inserted.
363 If second argument VISIT is non-nil, the buffer's visited filename
364 and last save file modtime are set, and it is marked unmodified.
365 If visiting and the file does not exist, visiting is completed
366 before the error is signaled.
368 The optional third and fourth arguments BEG and END
369 specify what portion of the file to insert.
370 If VISIT is non-nil, BEG and END must be nil.
371 If optional fifth argument REPLACE is non-nil,
372 it means replace the current buffer contents (in the accessible portion)
373 with the file contents. This is better than simply deleting and inserting
374 the whole thing because (1) it preserves some marker positions
375 and (2) it puts less data in the undo list.
377 NOTE: When Mule support is enabled, the REPLACE argument is
380 The coding system used for decoding the file is determined as follows:
382 1. `coding-system-for-read', if non-nil.
383 2. The result of `insert-file-contents-pre-hook', if non-nil.
384 3. The matching value for this filename from
385 `file-coding-system-alist', if any.
386 4. `buffer-file-coding-system-for-read', if non-nil.
387 5. The coding system 'no-conversion.
389 If a local value for `buffer-file-coding-system' in the current buffer
390 does not exist, it is set to the coding system which was actually used
393 See also `insert-file-contents-access-hook',
394 `insert-file-contents-pre-hook', `insert-file-contents-error-hook',
395 and `insert-file-contents-post-hook'."
396 (let (return-val coding-system used-codesys)
397 ;; OK, first load the file.
400 (run-hook-with-args 'insert-file-contents-access-hook
402 ;; determine the coding system to use, as described above.
406 coding-system-for-read
408 (run-hook-with-args-until-success
409 'insert-file-contents-pre-hook
412 (find-file-coding-system-for-read-from-filename filename)
414 buffer-file-coding-system-for-read
417 (if (consp coding-system)
418 (setq return-val coding-system)
419 (if (null (find-coding-system coding-system))
422 "Invalid coding-system (%s), using 'undecided"
424 (setq coding-system 'undecided)))
426 (insert-file-contents-internal filename visit beg end
427 replace coding-system
432 (run-hook-with-args 'insert-file-contents-error-hook
434 (signal (car err) (cdr err))))
435 (setq coding-system used-codesys)
436 ;; call any `post-read-conversion' for the coding system that
439 (coding-system-property coding-system 'post-read-conversion))
440 (endmark (make-marker)))
441 (set-marker endmark (+ (point) (nth 1 return-val)))
445 (let (buffer-read-only)
446 (funcall func (point) (marker-position endmark))))
449 (set-buffer-auto-saved)
450 (set-buffer-modified-p nil)))))
451 (setcar (cdr return-val) (- (marker-position endmark) (point))))
452 ;; now finally set the buffer's `buffer-file-coding-system'.
453 (if (run-hook-with-args-until-success 'insert-file-contents-post-hook
454 filename visit return-val)
456 (if (local-variable-p 'buffer-file-coding-system (current-buffer))
457 ;; if buffer-file-coding-system is already local, just
458 ;; set its eol type to what was found, if it wasn't
460 (set-buffer-file-coding-system
461 (subsidiary-coding-system buffer-file-coding-system
462 (coding-system-eol-type coding-system)))
463 ;; otherwise actually set buffer-file-coding-system.
464 (set-buffer-file-coding-system coding-system)))
467 (defvar write-region-pre-hook nil
468 "A special hook to decide the coding system used for writing out a file.
470 Before writing a file, `write-region' calls the functions on this hook
471 with arguments START, END, FILENAME, APPEND, VISIT, and CODING-SYSTEM,
472 the same as the corresponding arguments in the call to
475 The return value of the functions should be either
478 -- A coding system or a symbol denoting it, indicating the coding system
479 to be used for reading the file
480 -- A list of two elements (absolute pathname and length of data written),
481 which is used as the return value to `write-region'. In this
482 case, `write-region' assumes that the function has written
483 the file for itself and suppresses further writing.
485 If any function returns non-nil, the remaining functions are not called.")
487 (defvar write-region-post-hook nil
488 "A hook called by `write-region' after a file has been written out.
490 The functions on this hook are called with arguments START, END,
491 FILENAME, APPEND, VISIT, and CODING-SYSTEM, the same as the
492 corresponding arguments in the call to `write-region'.")
494 (defun write-region (start end filename &optional append visit lockname coding-system)
495 "Write current region into specified file.
496 By default the file's existing contents are replaced by the specified region.
497 When called from a program, takes three arguments:
498 START, END and FILENAME. START and END are buffer positions.
499 Optional fourth argument APPEND if non-nil means
500 append to existing file contents (if any).
501 Optional fifth argument VISIT if t means
502 set last-save-file-modtime of buffer to this file's modtime
503 and mark buffer not modified.
504 If VISIT is a string, it is a second file name;
505 the output goes to FILENAME, but the buffer is marked as visiting VISIT.
506 VISIT is also the file name to lock and unlock for clash detection.
507 If VISIT is neither t nor nil nor a string,
508 that means do not print the \"Wrote file\" message.
509 The optional sixth arg LOCKNAME, if non-nil, specifies the name to
510 use for locking and unlocking, overriding FILENAME and VISIT.
511 Kludgy feature: if START is a string, then that string is written
512 to the file, instead of any buffer contents, and END is ignored.
513 Optional seventh argument CODING-SYSTEM specifies the coding system
514 used to encode the text when it is written out, and defaults to
515 the value of `buffer-file-coding-system' in the current buffer.
516 Interactively, with a prefix arg, you will be prompted for the
518 See also `write-region-pre-hook' and `write-region-post-hook'."
519 (interactive "r\nFWrite region to file: \ni\ni\ni\nZCoding-system: ")
521 (or coding-system-for-write
522 (run-hook-with-args-until-success
523 'write-region-pre-hook start end filename append visit lockname)
525 buffer-file-coding-system
526 (find-file-coding-system-for-write-from-filename filename)
528 (if (consp coding-system)
531 (coding-system-property coding-system 'pre-write-conversion)))
533 (let ((curbuf (current-buffer))
534 (tempbuf (generate-new-buffer " *temp-write-buffer*"))
535 (modif (buffer-modified-p)))
540 (insert-buffer-substring curbuf start end)
541 (funcall func (point-min) (point-max))
542 (write-region-internal (point-min) (point-max) filename
544 (if (eq visit t) nil visit)
547 ;; leaving a buffer associated with file will cause problems
548 ;; when next visiting.
549 (kill-buffer tempbuf)
550 (if (or visit (null modif))
552 (set-buffer-auto-saved)
553 (set-buffer-modified-p nil)
554 (if (buffer-file-name) (set-visited-file-modtime))))))
555 (write-region-internal start end filename append visit lockname
557 (run-hook-with-args 'write-region-post-hook
558 start end filename append visit lockname
561 ;;; The following was all that remained in mule-files.el, so I moved it
562 ;;; here for neatness. -sb
563 (when (featurep 'mule)
564 (setq-default buffer-file-coding-system 'iso-2022-8))
566 ;;; code-files.el ends here