Correct merge
[emacs.git] / lisp / files.el
blob34c66bbd1d6977358b8ff760769122da9295aed3
1 ;;; files.el --- file input and output commands for Emacs -*- lexical-binding:t -*-
3 ;; Copyright (C) 1985-1987, 1992-2014 Free Software Foundation, Inc.
5 ;; Maintainer: emacs-devel@gnu.org
6 ;; Package: emacs
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
23 ;;; Commentary:
25 ;; Defines most of Emacs's file- and directory-handling functions,
26 ;; including basic file visiting, backup generation, link handling,
27 ;; ITS-id version control, load- and write-hook handling, and the like.
29 ;;; Code:
31 (defvar font-lock-keywords)
33 (defgroup backup nil
34 "Backups of edited data files."
35 :group 'files)
37 (defgroup find-file nil
38 "Finding files."
39 :group 'files)
42 (defcustom delete-auto-save-files t
43 "Non-nil means delete auto-save file when a buffer is saved or killed.
45 Note that the auto-save file will not be deleted if the buffer is killed
46 when it has unsaved changes."
47 :type 'boolean
48 :group 'auto-save)
50 (defcustom directory-abbrev-alist
51 nil
52 "Alist of abbreviations for file directories.
53 A list of elements of the form (FROM . TO), each meaning to replace
54 FROM with TO when it appears in a directory name. This replacement is
55 done when setting up the default directory of a newly visited file.
57 FROM is matched against directory names anchored at the first
58 character, so it should start with a \"\\\\`\", or, if directory
59 names cannot have embedded newlines, with a \"^\".
61 FROM and TO should be equivalent names, which refer to the
62 same directory. Do not use `~' in the TO strings;
63 they should be ordinary absolute directory names.
65 Use this feature when you have directories which you normally refer to
66 via absolute symbolic links. Make TO the name of the link, and FROM
67 the name it is linked to."
68 :type '(repeat (cons :format "%v"
69 :value ("\\`" . "")
70 (regexp :tag "From")
71 (string :tag "To")))
72 :group 'abbrev
73 :group 'find-file)
75 (defcustom make-backup-files t
76 "Non-nil means make a backup of a file the first time it is saved.
77 This can be done by renaming the file or by copying.
79 Renaming means that Emacs renames the existing file so that it is a
80 backup file, then writes the buffer into a new file. Any other names
81 that the old file had will now refer to the backup file. The new file
82 is owned by you and its group is defaulted.
84 Copying means that Emacs copies the existing file into the backup
85 file, then writes the buffer on top of the existing file. Any other
86 names that the old file had will now refer to the new (edited) file.
87 The file's owner and group are unchanged.
89 The choice of renaming or copying is controlled by the variables
90 `backup-by-copying', `backup-by-copying-when-linked',
91 `backup-by-copying-when-mismatch' and
92 `backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
93 :type 'boolean
94 :group 'backup)
96 ;; Do this so that local variables based on the file name
97 ;; are not overridden by the major mode.
98 (defvar backup-inhibited nil
99 "If non-nil, backups will be inhibited.
100 This variable is intended for use by making it local to a buffer,
101 but it is not an automatically buffer-local variable.")
102 (put 'backup-inhibited 'permanent-local t)
104 (defcustom backup-by-copying nil
105 "Non-nil means always use copying to create backup files.
106 See documentation of variable `make-backup-files'."
107 :type 'boolean
108 :group 'backup)
110 (defcustom backup-by-copying-when-linked nil
111 "Non-nil means use copying to create backups for files with multiple names.
112 This causes the alternate names to refer to the latest version as edited.
113 This variable is relevant only if `backup-by-copying' is nil."
114 :type 'boolean
115 :group 'backup)
117 (defcustom backup-by-copying-when-mismatch t
118 "Non-nil means create backups by copying if this preserves owner or group.
119 Renaming may still be used (subject to control of other variables)
120 when it would not result in changing the owner or group of the file;
121 that is, for files which are owned by you and whose group matches
122 the default for a new file created there by you.
123 This variable is relevant only if `backup-by-copying' is nil."
124 :version "24.1"
125 :type 'boolean
126 :group 'backup)
127 (put 'backup-by-copying-when-mismatch 'permanent-local t)
129 (defcustom backup-by-copying-when-privileged-mismatch 200
130 "Non-nil means create backups by copying to preserve a privileged owner.
131 Renaming may still be used (subject to control of other variables)
132 when it would not result in changing the owner of the file or if the owner
133 has a user id greater than the value of this variable. This is useful
134 when low-numbered uid's are used for special system users (such as root)
135 that must maintain ownership of certain files.
136 This variable is relevant only if `backup-by-copying' and
137 `backup-by-copying-when-mismatch' are nil."
138 :type '(choice (const nil) integer)
139 :group 'backup)
141 (defvar backup-enable-predicate 'normal-backup-enable-predicate
142 "Predicate that looks at a file name and decides whether to make backups.
143 Called with an absolute file name as argument, it returns t to enable backup.")
145 (defcustom buffer-offer-save nil
146 "Non-nil in a buffer means always offer to save buffer on exit.
147 Do so even if the buffer is not visiting a file.
148 Automatically local in all buffers."
149 :type 'boolean
150 :group 'backup)
151 (make-variable-buffer-local 'buffer-offer-save)
152 (put 'buffer-offer-save 'permanent-local t)
154 (defcustom find-file-existing-other-name t
155 "Non-nil means find a file under alternative names, in existing buffers.
156 This means if any existing buffer is visiting the file you want
157 under another name, you get the existing buffer instead of a new buffer."
158 :type 'boolean
159 :group 'find-file)
161 (defcustom find-file-visit-truename nil
162 "Non-nil means visiting a file uses its truename as the visited-file name.
163 That is, the buffer visiting the file has the truename as the
164 value of `buffer-file-name'. The truename of a file is found by
165 chasing all links both at the file level and at the levels of the
166 containing directories."
167 :type 'boolean
168 :group 'find-file)
169 (put 'find-file-visit-truename 'safe-local-variable 'booleanp)
171 (defcustom revert-without-query nil
172 "Specify which files should be reverted without query.
173 The value is a list of regular expressions.
174 If the file name matches one of these regular expressions,
175 then `revert-buffer' reverts the file without querying
176 if the file has changed on disk and you have not edited the buffer."
177 :type '(repeat regexp)
178 :group 'find-file)
180 (defvar buffer-file-number nil
181 "The device number and file number of the file visited in the current buffer.
182 The value is a list of the form (FILENUM DEVNUM).
183 This pair of numbers uniquely identifies the file.
184 If the buffer is visiting a new file, the value is nil.")
185 (make-variable-buffer-local 'buffer-file-number)
186 (put 'buffer-file-number 'permanent-local t)
188 (defvar buffer-file-numbers-unique (not (memq system-type '(windows-nt)))
189 "Non-nil means that `buffer-file-number' uniquely identifies files.")
191 (defvar buffer-file-read-only nil
192 "Non-nil if visited file was read-only when visited.")
193 (make-variable-buffer-local 'buffer-file-read-only)
195 (defcustom small-temporary-file-directory
196 (if (eq system-type 'ms-dos) (getenv "TMPDIR"))
197 "The directory for writing small temporary files.
198 If non-nil, this directory is used instead of `temporary-file-directory'
199 by programs that create small temporary files. This is for systems that
200 have fast storage with limited space, such as a RAM disk."
201 :group 'files
202 :initialize 'custom-initialize-delay
203 :type '(choice (const nil) directory))
205 ;; The system null device. (Should reference NULL_DEVICE from C.)
206 (defvar null-device (purecopy "/dev/null") "The system null device.")
208 (declare-function msdos-long-file-names "msdos.c")
209 (declare-function w32-long-file-name "w32proc.c")
210 (declare-function dired-get-filename "dired" (&optional localp no-error-if-not-filep))
211 (declare-function dired-unmark "dired" (arg &optional interactive))
212 (declare-function dired-do-flagged-delete "dired" (&optional nomessage))
213 (declare-function dos-8+3-filename "dos-fns" (filename))
214 (declare-function dosified-file-name "dos-fns" (file-name))
216 (defvar file-name-invalid-regexp
217 (cond ((and (eq system-type 'ms-dos) (not (msdos-long-file-names)))
218 (purecopy
219 (concat "^\\([^A-Z[-`a-z]\\|..+\\)?:\\|" ; colon except after drive
220 "[+, ;=|<>\"?*]\\|\\[\\|\\]\\|" ; invalid characters
221 "[\000-\037]\\|" ; control characters
222 "\\(/\\.\\.?[^/]\\)\\|" ; leading dots
223 "\\(/[^/.]+\\.[^/.]*\\.\\)"))) ; more than a single dot
224 ((memq system-type '(ms-dos windows-nt cygwin))
225 (purecopy
226 (concat "^\\([^A-Z[-`a-z]\\|..+\\)?:\\|" ; colon except after drive
227 "[|<>\"?*\000-\037]"))) ; invalid characters
228 (t (purecopy "[\000]")))
229 "Regexp recognizing file names which aren't allowed by the filesystem.")
231 (defcustom file-precious-flag nil
232 "Non-nil means protect against I/O errors while saving files.
233 Some modes set this non-nil in particular buffers.
235 This feature works by writing the new contents into a temporary file
236 and then renaming the temporary file to replace the original.
237 In this way, any I/O error in writing leaves the original untouched,
238 and there is never any instant where the file is nonexistent.
240 Note that this feature forces backups to be made by copying.
241 Yet, at the same time, saving a precious file
242 breaks any hard links between it and other files.
244 This feature is advisory: for example, if the directory in which the
245 file is being saved is not writable, Emacs may ignore a non-nil value
246 of `file-precious-flag' and write directly into the file.
248 See also: `break-hardlink-on-save'."
249 :type 'boolean
250 :group 'backup)
252 (defcustom break-hardlink-on-save nil
253 "Whether to allow breaking hardlinks when saving files.
254 If non-nil, then when saving a file that exists under several
255 names \(i.e., has multiple hardlinks), break the hardlink
256 associated with `buffer-file-name' and write to a new file, so
257 that the other instances of the file are not affected by the
258 save.
260 If `buffer-file-name' refers to a symlink, do not break the symlink.
262 Unlike `file-precious-flag', `break-hardlink-on-save' is not advisory.
263 For example, if the directory in which a file is being saved is not
264 itself writable, then error instead of saving in some
265 hardlink-nonbreaking way.
267 See also `backup-by-copying' and `backup-by-copying-when-linked'."
268 :type 'boolean
269 :group 'files
270 :version "23.1")
272 (defcustom version-control nil
273 "Control use of version numbers for backup files.
274 When t, make numeric backup versions unconditionally.
275 When nil, make them for files that have some already.
276 The value `never' means do not make them."
277 :type '(choice (const :tag "Never" never)
278 (const :tag "If existing" nil)
279 (other :tag "Always" t))
280 :group 'backup
281 :group 'vc)
282 (put 'version-control 'safe-local-variable
283 (lambda (x) (or (booleanp x) (equal x 'never))))
285 (defcustom dired-kept-versions 2
286 "When cleaning directory, number of versions to keep."
287 :type 'integer
288 :group 'backup
289 :group 'dired)
291 (defcustom delete-old-versions nil
292 "If t, delete excess backup versions silently.
293 If nil, ask confirmation. Any other value prevents any trimming."
294 :type '(choice (const :tag "Delete" t)
295 (const :tag "Ask" nil)
296 (other :tag "Leave" other))
297 :group 'backup)
299 (defcustom kept-old-versions 2
300 "Number of oldest versions to keep when a new numbered backup is made."
301 :type 'integer
302 :group 'backup)
303 (put 'kept-old-versions 'safe-local-variable 'integerp)
305 (defcustom kept-new-versions 2
306 "Number of newest versions to keep when a new numbered backup is made.
307 Includes the new backup. Must be > 0"
308 :type 'integer
309 :group 'backup)
310 (put 'kept-new-versions 'safe-local-variable 'integerp)
312 (defcustom require-final-newline nil
313 "Whether to add a newline automatically at the end of the file.
315 A value of t means do this only when the file is about to be saved.
316 A value of `visit' means do this right after the file is visited.
317 A value of `visit-save' means do it at both of those times.
318 Any other non-nil value means ask user whether to add a newline, when saving.
319 A value of nil means don't add newlines.
321 Certain major modes set this locally to the value obtained
322 from `mode-require-final-newline'."
323 :safe #'symbolp
324 :type '(choice (const :tag "When visiting" visit)
325 (const :tag "When saving" t)
326 (const :tag "When visiting or saving" visit-save)
327 (const :tag "Don't add newlines" nil)
328 (other :tag "Ask each time" ask))
329 :group 'editing-basics)
331 (defcustom mode-require-final-newline t
332 "Whether to add a newline at end of file, in certain major modes.
333 Those modes set `require-final-newline' to this value when you enable them.
334 They do so because they are often used for files that are supposed
335 to end in newlines, and the question is how to arrange that.
337 A value of t means do this only when the file is about to be saved.
338 A value of `visit' means do this right after the file is visited.
339 A value of `visit-save' means do it at both of those times.
340 Any other non-nil value means ask user whether to add a newline, when saving.
342 A value of nil means do not add newlines. That is a risky choice in this
343 variable since this value is used for modes for files that ought to have
344 final newlines. So if you set this to nil, you must explicitly check and
345 add a final newline, whenever you save a file that really needs one."
346 :type '(choice (const :tag "When visiting" visit)
347 (const :tag "When saving" t)
348 (const :tag "When visiting or saving" visit-save)
349 (const :tag "Don't add newlines" nil)
350 (other :tag "Ask each time" ask))
351 :group 'editing-basics
352 :version "22.1")
354 (defcustom auto-save-default t
355 "Non-nil says by default do auto-saving of every file-visiting buffer."
356 :type 'boolean
357 :group 'auto-save)
359 (defcustom auto-save-file-name-transforms
360 `(("\\`/[^/]*:\\([^/]*/\\)*\\([^/]*\\)\\'"
361 ;; Don't put "\\2" inside expand-file-name, since it will be
362 ;; transformed to "/2" on DOS/Windows.
363 ,(concat temporary-file-directory "\\2") t))
364 "Transforms to apply to buffer file name before making auto-save file name.
365 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
366 REGEXP is a regular expression to match against the file name.
367 If it matches, `replace-match' is used to replace the
368 matching part with REPLACEMENT.
369 If the optional element UNIQUIFY is non-nil, the auto-save file name is
370 constructed by taking the directory part of the replaced file-name,
371 concatenated with the buffer file name with all directory separators
372 changed to `!' to prevent clashes. This will not work
373 correctly if your filesystem truncates the resulting name.
375 All the transforms in the list are tried, in the order they are listed.
376 When one transform applies, its result is final;
377 no further transforms are tried.
379 The default value is set up to put the auto-save file into the
380 temporary directory (see the variable `temporary-file-directory') for
381 editing a remote file.
383 On MS-DOS filesystems without long names this variable is always
384 ignored."
385 :group 'auto-save
386 :type '(repeat (list (string :tag "Regexp") (string :tag "Replacement")
387 (boolean :tag "Uniquify")))
388 :initialize 'custom-initialize-delay
389 :version "21.1")
391 (defcustom save-abbrevs t
392 "Non-nil means save word abbrevs too when files are saved.
393 If `silently', don't ask the user before saving."
394 :type '(choice (const t) (const nil) (const silently))
395 :group 'abbrev)
397 (defcustom find-file-run-dired t
398 "Non-nil means allow `find-file' to visit directories.
399 To visit the directory, `find-file' runs `find-directory-functions'."
400 :type 'boolean
401 :group 'find-file)
403 (defcustom find-directory-functions '(cvs-dired-noselect dired-noselect)
404 "List of functions to try in sequence to visit a directory.
405 Each function is called with the directory name as the sole argument
406 and should return either a buffer or nil."
407 :type '(hook :options (cvs-dired-noselect dired-noselect))
408 :group 'find-file)
410 ;; FIXME: also add a hook for `(thing-at-point 'filename)'
411 (defcustom file-name-at-point-functions '(ffap-guess-file-name-at-point)
412 "List of functions to try in sequence to get a file name at point.
413 Each function should return either nil or a file name found at the
414 location of point in the current buffer."
415 :type '(hook :options (ffap-guess-file-name-at-point))
416 :group 'find-file)
418 ;;;It is not useful to make this a local variable.
419 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
420 (define-obsolete-variable-alias 'find-file-not-found-hooks
421 'find-file-not-found-functions "22.1")
422 (defvar find-file-not-found-functions nil
423 "List of functions to be called for `find-file' on nonexistent file.
424 These functions are called as soon as the error is detected.
425 Variable `buffer-file-name' is already set up.
426 The functions are called in the order given until one of them returns non-nil.")
428 ;;;It is not useful to make this a local variable.
429 ;;;(put 'find-file-hooks 'permanent-local t)
430 (define-obsolete-variable-alias 'find-file-hooks 'find-file-hook "22.1")
431 (defcustom find-file-hook nil
432 "List of functions to be called after a buffer is loaded from a file.
433 The buffer's local variables (if any) will have been processed before the
434 functions are called."
435 :group 'find-file
436 :type 'hook
437 :options '(auto-insert)
438 :version "22.1")
440 (define-obsolete-variable-alias 'write-file-hooks 'write-file-functions "22.1")
441 (defvar write-file-functions nil
442 "List of functions to be called before writing out a buffer to a file.
443 If one of them returns non-nil, the file is considered already written
444 and the rest are not called.
445 These hooks are considered to pertain to the visited file.
446 So any buffer-local binding of this variable is discarded if you change
447 the visited file name with \\[set-visited-file-name], but not when you
448 change the major mode.
450 This hook is not run if any of the functions in
451 `write-contents-functions' returns non-nil. Both hooks pertain
452 to how to save a buffer to file, for instance, choosing a suitable
453 coding system and setting mode bits. (See Info
454 node `(elisp)Saving Buffers'.) To perform various checks or
455 updates before the buffer is saved, use `before-save-hook'.")
456 (put 'write-file-functions 'permanent-local t)
458 (defvar local-write-file-hooks nil)
459 (make-variable-buffer-local 'local-write-file-hooks)
460 (put 'local-write-file-hooks 'permanent-local t)
461 (make-obsolete-variable 'local-write-file-hooks 'write-file-functions "22.1")
463 (define-obsolete-variable-alias 'write-contents-hooks
464 'write-contents-functions "22.1")
465 (defvar write-contents-functions nil
466 "List of functions to be called before writing out a buffer to a file.
467 If one of them returns non-nil, the file is considered already written
468 and the rest are not called and neither are the functions in
469 `write-file-functions'.
471 This variable is meant to be used for hooks that pertain to the
472 buffer's contents, not to the particular visited file; thus,
473 `set-visited-file-name' does not clear this variable; but changing the
474 major mode does clear it.
476 For hooks that _do_ pertain to the particular visited file, use
477 `write-file-functions'. Both this variable and
478 `write-file-functions' relate to how a buffer is saved to file.
479 To perform various checks or updates before the buffer is saved,
480 use `before-save-hook'.")
481 (make-variable-buffer-local 'write-contents-functions)
483 (defcustom enable-local-variables t
484 "Control use of local variables in files you visit.
485 The value can be t, nil, :safe, :all, or something else.
487 A value of t means file local variables specifications are obeyed
488 if all the specified variable values are safe; if any values are
489 not safe, Emacs queries you, once, whether to set them all.
490 \(When you say yes to certain values, they are remembered as safe.)
492 :safe means set the safe variables, and ignore the rest.
493 :all means set all variables, whether safe or not.
494 (Don't set it permanently to :all.)
495 A value of nil means always ignore the file local variables.
497 Any other value means always query you once whether to set them all.
498 \(When you say yes to certain values, they are remembered as safe, but
499 this has no effect when `enable-local-variables' is \"something else\".)
501 This variable also controls use of major modes specified in
502 a -*- line.
504 The command \\[normal-mode], when used interactively,
505 always obeys file local variable specifications and the -*- line,
506 and ignores this variable."
507 :risky t
508 :type '(choice (const :tag "Query Unsafe" t)
509 (const :tag "Safe Only" :safe)
510 (const :tag "Do all" :all)
511 (const :tag "Ignore" nil)
512 (other :tag "Query" other))
513 :group 'find-file)
515 (defvar enable-dir-local-variables t
516 "Non-nil means enable use of directory-local variables.
517 Some modes may wish to set this to nil to prevent directory-local
518 settings being applied, but still respect file-local ones.")
520 ;; This is an odd variable IMO.
521 ;; You might wonder why it is needed, when we could just do:
522 ;; (set (make-local-variable 'enable-local-variables) nil)
523 ;; These two are not precisely the same.
524 ;; Setting this variable does not cause -*- mode settings to be
525 ;; ignored, whereas setting enable-local-variables does.
526 ;; Only three places in Emacs use this variable: tar and arc modes,
527 ;; and rmail. The first two don't need it. They already use
528 ;; inhibit-local-variables-regexps, which is probably enough, and
529 ;; could also just set enable-local-variables locally to nil.
530 ;; Them setting it has the side-effect that dir-locals cannot apply to
531 ;; eg tar files (?). FIXME Is this appropriate?
532 ;; AFAICS, rmail is the only thing that needs this, and the only
533 ;; reason it uses it is for BABYL files (which are obsolete).
534 ;; These contain "-*- rmail -*-" in the first line, which rmail wants
535 ;; to respect, so that find-file on a BABYL file will switch to
536 ;; rmail-mode automatically (this is nice, but hardly essential,
537 ;; since most people are used to explicitly running a command to
538 ;; access their mail; M-x gnus etc). Rmail files may happen to
539 ;; contain Local Variables sections in messages, which Rmail wants to
540 ;; ignore. So AFAICS the only reason this variable exists is for a
541 ;; minor convenience feature for handling of an obsolete Rmail file format.
542 (defvar local-enable-local-variables t
543 "Like `enable-local-variables' but meant for buffer-local bindings.
544 The meaningful values are nil and non-nil. The default is non-nil.
545 If a major mode sets this to nil, buffer-locally, then any local
546 variables list in a file visited in that mode will be ignored.
548 This variable does not affect the use of major modes specified
549 in a -*- line.")
551 (defcustom enable-local-eval 'maybe
552 "Control processing of the \"variable\" `eval' in a file's local variables.
553 The value can be t, nil or something else.
554 A value of t means obey `eval' variables.
555 A value of nil means ignore them; anything else means query."
556 :risky t
557 :type '(choice (const :tag "Obey" t)
558 (const :tag "Ignore" nil)
559 (other :tag "Query" other))
560 :group 'find-file)
562 (defcustom view-read-only nil
563 "Non-nil means buffers visiting files read-only do so in view mode.
564 In fact, this means that all read-only buffers normally have
565 View mode enabled, including buffers that are read-only because
566 you visit a file you cannot alter, and buffers you make read-only
567 using \\[toggle-read-only]."
568 :type 'boolean
569 :group 'view)
571 (defvar file-name-history nil
572 "History list of file names entered in the minibuffer.
574 Maximum length of the history list is determined by the value
575 of `history-length', which see.")
577 (put 'ange-ftp-completion-hook-function 'safe-magic t)
578 (defun ange-ftp-completion-hook-function (op &rest args)
579 "Provides support for ange-ftp host name completion.
580 Runs the usual ange-ftp hook, but only for completion operations."
581 ;; Having this here avoids the need to load ange-ftp when it's not
582 ;; really in use.
583 (if (memq op '(file-name-completion file-name-all-completions))
584 (apply 'ange-ftp-hook-function op args)
585 (let ((inhibit-file-name-handlers
586 (cons 'ange-ftp-completion-hook-function
587 (and (eq inhibit-file-name-operation op)
588 inhibit-file-name-handlers)))
589 (inhibit-file-name-operation op))
590 (apply op args))))
592 (declare-function dos-convert-standard-filename "dos-fns.el" (filename))
593 (declare-function w32-convert-standard-filename "w32-fns.el" (filename))
595 (defun convert-standard-filename (filename)
596 "Convert a standard file's name to something suitable for the OS.
597 This means to guarantee valid names and perhaps to canonicalize
598 certain patterns.
600 FILENAME should be an absolute file name since the conversion rules
601 sometimes vary depending on the position in the file name. E.g. c:/foo
602 is a valid DOS file name, but c:/bar/c:/foo is not.
604 This function's standard definition is trivial; it just returns
605 the argument. However, on Windows and DOS, replace invalid
606 characters. On DOS, make sure to obey the 8.3 limitations.
607 In the native Windows build, turn Cygwin names into native names,
608 and also turn slashes into backslashes if the shell requires it (see
609 `w32-shell-dos-semantics').
611 See Info node `(elisp)Standard File Names' for more details."
612 (cond
613 ((eq system-type 'cygwin)
614 (let ((name (copy-sequence filename))
615 (start 0))
616 ;; Replace invalid filename characters with !
617 (while (string-match "[?*:<>|\"\000-\037]" name start)
618 (aset name (match-beginning 0) ?!)
619 (setq start (match-end 0)))
620 name))
621 ((eq system-type 'windows-nt)
622 (w32-convert-standard-filename filename))
623 ((eq system-type 'ms-dos)
624 (dos-convert-standard-filename filename))
625 (t filename)))
627 (defun read-directory-name (prompt &optional dir default-dirname mustmatch initial)
628 "Read directory name, prompting with PROMPT and completing in directory DIR.
629 Value is not expanded---you must call `expand-file-name' yourself.
630 Default name to DEFAULT-DIRNAME if user exits with the same
631 non-empty string that was inserted by this function.
632 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
633 or just DIR if INITIAL is nil.)
634 If the user exits with an empty minibuffer, this function returns
635 an empty string. (This can only happen if the user erased the
636 pre-inserted contents or if `insert-default-directory' is nil.)
637 Fourth arg MUSTMATCH non-nil means require existing directory's name.
638 Non-nil and non-t means also require confirmation after completion.
639 Fifth arg INITIAL specifies text to start with.
640 DIR should be an absolute directory name. It defaults to
641 the value of `default-directory'."
642 (unless dir
643 (setq dir default-directory))
644 (read-file-name prompt dir (or default-dirname
645 (if initial (expand-file-name initial dir)
646 dir))
647 mustmatch initial
648 'file-directory-p))
651 (defun pwd ()
652 "Show the current default directory."
653 (interactive nil)
654 (message "Directory %s" default-directory))
656 (defvar cd-path nil
657 "Value of the CDPATH environment variable, as a list.
658 Not actually set up until the first time you use it.")
660 (defun parse-colon-path (search-path)
661 "Explode a search path into a list of directory names.
662 Directories are separated by `path-separator' (which is colon in
663 GNU and Unix systems). Substitute environment variables into the
664 resulting list of directory names. For an empty path element (i.e.,
665 a leading or trailing separator, or two adjacent separators), return
666 nil (meaning `default-directory') as the associated list element."
667 (when (stringp search-path)
668 (mapcar (lambda (f)
669 (if (equal "" f) nil
670 (substitute-in-file-name (file-name-as-directory f))))
671 (split-string search-path path-separator))))
673 (defun cd-absolute (dir)
674 "Change current directory to given absolute file name DIR."
675 ;; Put the name into directory syntax now,
676 ;; because otherwise expand-file-name may give some bad results.
677 (setq dir (file-name-as-directory dir))
678 ;; We used to additionally call abbreviate-file-name here, for an
679 ;; unknown reason. Problem is that most buffers are setup
680 ;; without going through cd-absolute and don't call
681 ;; abbreviate-file-name on their default-directory, so the few that
682 ;; do end up using a superficially different directory.
683 (setq dir (expand-file-name dir))
684 (if (not (file-directory-p dir))
685 (if (file-exists-p dir)
686 (error "%s is not a directory" dir)
687 (error "%s: no such directory" dir))
688 (unless (file-executable-p dir)
689 (error "Cannot cd to %s: Permission denied" dir))
690 (setq default-directory dir)
691 (setq list-buffers-directory dir)))
693 (defun cd (dir)
694 "Make DIR become the current buffer's default directory.
695 If your environment includes a `CDPATH' variable, try each one of
696 that list of directories (separated by occurrences of
697 `path-separator') when resolving a relative directory name.
698 The path separator is colon in GNU and GNU-like systems."
699 (interactive
700 (list
701 ;; FIXME: There's a subtle bug in the completion below. Seems linked
702 ;; to a fundamental difficulty of implementing `predicate' correctly.
703 ;; The manifestation is that TAB may list non-directories in the case where
704 ;; those files also correspond to valid directories (if your cd-path is (A/
705 ;; B/) and you have A/a a file and B/a a directory, then both `a' and `a/'
706 ;; will be listed as valid completions).
707 ;; This is because `a' (listed because of A/a) is indeed a valid choice
708 ;; (which will lead to the use of B/a).
709 (minibuffer-with-setup-hook
710 (lambda ()
711 (setq minibuffer-completion-table
712 (apply-partially #'locate-file-completion-table
713 cd-path nil))
714 (setq minibuffer-completion-predicate
715 (lambda (dir)
716 (locate-file dir cd-path nil
717 (lambda (f) (and (file-directory-p f) 'dir-ok))))))
718 (unless cd-path
719 (setq cd-path (or (parse-colon-path (getenv "CDPATH"))
720 (list "./"))))
721 (read-directory-name "Change default directory: "
722 default-directory default-directory
723 t))))
724 (unless cd-path
725 (setq cd-path (or (parse-colon-path (getenv "CDPATH"))
726 (list "./"))))
727 (cd-absolute
728 (or (locate-file dir cd-path nil
729 (lambda (f) (and (file-directory-p f) 'dir-ok)))
730 (error "No such directory found via CDPATH environment variable"))))
732 (defun load-file (file)
733 "Load the Lisp file named FILE."
734 ;; This is a case where .elc makes a lot of sense.
735 (interactive (list (let ((completion-ignored-extensions
736 (remove ".elc" completion-ignored-extensions)))
737 (read-file-name "Load file: " nil nil 'lambda))))
738 (load (expand-file-name file) nil nil t))
740 (defun locate-file (filename path &optional suffixes predicate)
741 "Search for FILENAME through PATH.
742 If found, return the absolute file name of FILENAME; otherwise
743 return nil.
744 PATH should be a list of directories to look in, like the lists in
745 `exec-path' or `load-path'.
746 If SUFFIXES is non-nil, it should be a list of suffixes to append to
747 file name when searching. If SUFFIXES is nil, it is equivalent to '(\"\").
748 Use '(\"/\") to disable PATH search, but still try the suffixes in SUFFIXES.
749 If non-nil, PREDICATE is used instead of `file-readable-p'.
751 This function will normally skip directories, so if you want it to find
752 directories, make sure the PREDICATE function returns `dir-ok' for them.
754 PREDICATE can also be an integer to pass to the `access' system call,
755 in which case file-name handlers are ignored. This usage is deprecated.
756 For compatibility, PREDICATE can also be one of the symbols
757 `executable', `readable', `writable', or `exists', or a list of
758 one or more of those symbols."
759 (if (and predicate (symbolp predicate) (not (functionp predicate)))
760 (setq predicate (list predicate)))
761 (when (and (consp predicate) (not (functionp predicate)))
762 (setq predicate
763 (logior (if (memq 'executable predicate) 1 0)
764 (if (memq 'writable predicate) 2 0)
765 (if (memq 'readable predicate) 4 0))))
766 (locate-file-internal filename path suffixes predicate))
768 (defun locate-file-completion-table (dirs suffixes string pred action)
769 "Do completion for file names passed to `locate-file'."
770 (cond
771 ((file-name-absolute-p string)
772 ;; FIXME: maybe we should use completion-file-name-table instead,
773 ;; tho at least for `load', the arg is passed through
774 ;; substitute-in-file-name for historical reasons.
775 (read-file-name-internal string pred action))
776 ((eq (car-safe action) 'boundaries)
777 (let ((suffix (cdr action)))
778 `(boundaries
779 ,(length (file-name-directory string))
780 ,@(let ((x (file-name-directory suffix)))
781 (if x (1- (length x)) (length suffix))))))
783 (let ((names '())
784 ;; If we have files like "foo.el" and "foo.elc", we could load one of
785 ;; them with "foo.el", "foo.elc", or "foo", where just "foo" is the
786 ;; preferred way. So if we list all 3, that gives a lot of redundant
787 ;; entries for the poor soul looking just for "foo". OTOH, sometimes
788 ;; the user does want to pay attention to the extension. We try to
789 ;; diffuse this tension by stripping the suffix, except when the
790 ;; result is a single element (i.e. usually we only list "foo" unless
791 ;; it's the only remaining element in the list, in which case we do
792 ;; list "foo", "foo.elc" and "foo.el").
793 (fullnames '())
794 (suffix (concat (regexp-opt suffixes t) "\\'"))
795 (string-dir (file-name-directory string))
796 (string-file (file-name-nondirectory string)))
797 (dolist (dir dirs)
798 (unless dir
799 (setq dir default-directory))
800 (if string-dir (setq dir (expand-file-name string-dir dir)))
801 (when (file-directory-p dir)
802 (dolist (file (file-name-all-completions
803 string-file dir))
804 (if (not (string-match suffix file))
805 (push file names)
806 (push file fullnames)
807 (push (substring file 0 (match-beginning 0)) names)))))
808 ;; Switching from names to names+fullnames creates a non-monotonicity
809 ;; which can cause problems with things like partial-completion.
810 ;; To minimize the problem, filter out completion-regexp-list, so that
811 ;; M-x load-library RET t/x.e TAB finds some files. Also remove elements
812 ;; from `names' which only matched `string' when they still had
813 ;; their suffix.
814 (setq names (all-completions string names))
815 ;; Remove duplicates of the first element, so that we can easily check
816 ;; if `names' really only contains a single element.
817 (when (cdr names) (setcdr names (delete (car names) (cdr names))))
818 (unless (cdr names)
819 ;; There's no more than one matching non-suffixed element, so expand
820 ;; the list by adding the suffixed elements as well.
821 (setq names (nconc names fullnames)))
822 (completion-table-with-context
823 string-dir names string-file pred action)))))
825 (defun locate-file-completion (string path-and-suffixes action)
826 "Do completion for file names passed to `locate-file'.
827 PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
828 (declare (obsolete locate-file-completion-table "23.1"))
829 (locate-file-completion-table (car path-and-suffixes)
830 (cdr path-and-suffixes)
831 string nil action))
833 (defvar locate-dominating-stop-dir-regexp
834 (purecopy "\\`\\(?:[\\/][\\/][^\\/]+[\\/]\\|/\\(?:net\\|afs\\|\\.\\.\\.\\)/\\)\\'")
835 "Regexp of directory names which stop the search in `locate-dominating-file'.
836 Any directory whose name matches this regexp will be treated like
837 a kind of root directory by `locate-dominating-file' which will stop its search
838 when it bumps into it.
839 The default regexp prevents fruitless and time-consuming attempts to find
840 special files in directories in which filenames are interpreted as hostnames,
841 or mount points potentially requiring authentication as a different user.")
843 ;; (defun locate-dominating-files (file regexp)
844 ;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
845 ;; Stop at the first parent where a matching file is found and return the list
846 ;; of files that that match in this directory."
847 ;; (catch 'found
848 ;; ;; `user' is not initialized yet because `file' may not exist, so we may
849 ;; ;; have to walk up part of the hierarchy before we find the "initial UID".
850 ;; (let ((user nil)
851 ;; ;; Abbreviate, so as to stop when we cross ~/.
852 ;; (dir (abbreviate-file-name (file-name-as-directory file)))
853 ;; files)
854 ;; (while (and dir
855 ;; ;; As a heuristic, we stop looking up the hierarchy of
856 ;; ;; directories as soon as we find a directory belonging to
857 ;; ;; another user. This should save us from looking in
858 ;; ;; things like /net and /afs. This assumes that all the
859 ;; ;; files inside a project belong to the same user.
860 ;; (let ((prev-user user))
861 ;; (setq user (nth 2 (file-attributes dir)))
862 ;; (or (null prev-user) (equal user prev-user))))
863 ;; (if (setq files (condition-case nil
864 ;; (directory-files dir 'full regexp 'nosort)
865 ;; (error nil)))
866 ;; (throw 'found files)
867 ;; (if (equal dir
868 ;; (setq dir (file-name-directory
869 ;; (directory-file-name dir))))
870 ;; (setq dir nil))))
871 ;; nil)))
873 (defun locate-dominating-file (file name)
874 "Look up the directory hierarchy from FILE for a directory containing NAME.
875 Stop at the first parent directory containing a file NAME,
876 and return the directory. Return nil if not found.
877 Instead of a string, NAME can also be a predicate taking one argument
878 \(a directory) and returning a non-nil value if that directory is the one for
879 which we're looking."
880 ;; We used to use the above locate-dominating-files code, but the
881 ;; directory-files call is very costly, so we're much better off doing
882 ;; multiple calls using the code in here.
884 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
885 ;; `name' in /home or in /.
886 (setq file (abbreviate-file-name file))
887 (let ((root nil)
888 ;; `user' is not initialized outside the loop because
889 ;; `file' may not exist, so we may have to walk up part of the
890 ;; hierarchy before we find the "initial UID". Note: currently unused
891 ;; (user nil)
892 try)
893 (while (not (or root
894 (null file)
895 ;; FIXME: Disabled this heuristic because it is sometimes
896 ;; inappropriate.
897 ;; As a heuristic, we stop looking up the hierarchy of
898 ;; directories as soon as we find a directory belonging
899 ;; to another user. This should save us from looking in
900 ;; things like /net and /afs. This assumes that all the
901 ;; files inside a project belong to the same user.
902 ;; (let ((prev-user user))
903 ;; (setq user (nth 2 (file-attributes file)))
904 ;; (and prev-user (not (equal user prev-user))))
905 (string-match locate-dominating-stop-dir-regexp file)))
906 (setq try (if (stringp name)
907 (file-exists-p (expand-file-name name file))
908 (funcall name file)))
909 (cond (try (setq root file))
910 ((equal file (setq file (file-name-directory
911 (directory-file-name file))))
912 (setq file nil))))
913 (if root (file-name-as-directory root))))
915 (defcustom user-emacs-directory-warning t
916 "Non-nil means warn if cannot access `user-emacs-directory'.
917 Set this to nil at your own risk..."
918 :type 'boolean
919 :group 'initialization
920 :version "24.4")
922 (defun locate-user-emacs-file (new-name &optional old-name)
923 "Return an absolute per-user Emacs-specific file name.
924 If NEW-NAME exists in `user-emacs-directory', return it.
925 Else if OLD-NAME is non-nil and ~/OLD-NAME exists, return ~/OLD-NAME.
926 Else return NEW-NAME in `user-emacs-directory', creating the
927 directory if it does not exist."
928 (convert-standard-filename
929 (let* ((home (concat "~" (or init-file-user "")))
930 (at-home (and old-name (expand-file-name old-name home)))
931 (bestname (abbreviate-file-name
932 (expand-file-name new-name user-emacs-directory))))
933 (if (and at-home (not (file-readable-p bestname))
934 (file-readable-p at-home))
935 at-home
936 ;; Make sure `user-emacs-directory' exists,
937 ;; unless we're in batch mode or dumping Emacs.
938 (or noninteractive
939 purify-flag
940 (let (errtype)
941 (if (file-directory-p user-emacs-directory)
942 (or (file-accessible-directory-p user-emacs-directory)
943 (setq errtype "access"))
944 (let ((umask (default-file-modes)))
945 (unwind-protect
946 (progn
947 (set-default-file-modes ?\700)
948 (condition-case nil
949 (make-directory user-emacs-directory)
950 (error (setq errtype "create"))))
951 (set-default-file-modes umask))))
952 (when (and errtype
953 user-emacs-directory-warning
954 (not (get 'user-emacs-directory-warning 'this-session)))
955 ;; Only warn once per Emacs session.
956 (put 'user-emacs-directory-warning 'this-session t)
957 (display-warning 'initialization
958 (format "\
959 Unable to %s `user-emacs-directory' (%s).
960 Any data that would normally be written there may be lost!
961 If you never want to see this message again,
962 customize the variable `user-emacs-directory-warning'."
963 errtype user-emacs-directory)))))
964 bestname))))
967 (defun executable-find (command)
968 "Search for COMMAND in `exec-path' and return the absolute file name.
969 Return nil if COMMAND is not found anywhere in `exec-path'."
970 ;; Use 1 rather than file-executable-p to better match the behavior of
971 ;; call-process.
972 (locate-file command exec-path exec-suffixes 1))
974 (defun load-library (library)
975 "Load the Emacs Lisp library named LIBRARY.
976 This is an interface to the function `load'. LIBRARY is searched
977 for in `load-path', both with and without `load-suffixes' (as
978 well as `load-file-rep-suffixes').
980 See Info node `(emacs)Lisp Libraries' for more details.
981 See `load-file' for a different interface to `load'."
982 (interactive
983 (list (completing-read "Load library: "
984 (apply-partially 'locate-file-completion-table
985 load-path
986 (get-load-suffixes)))))
987 (load library))
989 (defun file-remote-p (file &optional identification connected)
990 "Test whether FILE specifies a location on a remote system.
991 A file is considered remote if accessing it is likely to
992 be slower or less reliable than accessing local files.
994 `file-remote-p' never opens a new remote connection. It can
995 only reuse a connection that is already open.
997 Return nil or a string identifying the remote connection
998 \(ideally a prefix of FILE). Return nil if FILE is a relative
999 file name.
1001 When IDENTIFICATION is nil, the returned string is a complete
1002 remote identifier: with components method, user, and host. The
1003 components are those present in FILE, with defaults filled in for
1004 any that are missing.
1006 IDENTIFICATION can specify which part of the identification to
1007 return. IDENTIFICATION can be the symbol `method', `user',
1008 `host', or `localname'. Any other value is handled like nil and
1009 means to return the complete identification. The string returned
1010 for IDENTIFICATION `localname' can differ depending on whether
1011 there is an existing connection.
1013 If CONNECTED is non-nil, return an identification only if FILE is
1014 located on a remote system and a connection is established to
1015 that remote system.
1017 Tip: You can use this expansion of remote identifier components
1018 to derive a new remote file name from an existing one. For
1019 example, if FILE is \"/sudo::/path/to/file\" then
1021 \(concat \(file-remote-p FILE) \"/bin/sh\")
1023 returns a remote file name for file \"/bin/sh\" that has the
1024 same remote identifier as FILE but expanded; a name such as
1025 \"/sudo:root@myhost:/bin/sh\"."
1026 (let ((handler (find-file-name-handler file 'file-remote-p)))
1027 (if handler
1028 (funcall handler 'file-remote-p file identification connected)
1029 nil)))
1031 ;; Probably this entire variable should be obsolete now, in favor of
1032 ;; something Tramp-related (?). It is not used in many places.
1033 ;; It's not clear what the best file for this to be in is, but given
1034 ;; it uses custom-initialize-delay, it is easier if it is preloaded
1035 ;; rather than autoloaded.
1036 (defcustom remote-shell-program
1037 ;; This used to try various hard-coded places for remsh, rsh, and
1038 ;; rcmd, trying to guess based on location whether "rsh" was
1039 ;; "restricted shell" or "remote shell", but I don't see the point
1040 ;; in this day and age. Almost everyone will use ssh, and have
1041 ;; whatever command they want to use in PATH.
1042 (purecopy
1043 (let ((list '("ssh" "remsh" "rcmd" "rsh")))
1044 (while (and list
1045 (not (executable-find (car list)))
1046 (setq list (cdr list))))
1047 (or (car list) "ssh")))
1048 "Program to use to execute commands on a remote host (e.g. ssh or rsh)."
1049 :version "24.3" ; ssh rather than rsh, etc
1050 :initialize 'custom-initialize-delay
1051 :group 'environment
1052 :type 'file)
1054 (defcustom remote-file-name-inhibit-cache 10
1055 "Whether to use the remote file-name cache for read access.
1056 When `nil', never expire cached values (caution)
1057 When `t', never use the cache (safe, but may be slow)
1058 A number means use cached values for that amount of seconds since caching.
1060 The attributes of remote files are cached for better performance.
1061 If they are changed outside of Emacs's control, the cached values
1062 become invalid, and must be reread. If you are sure that nothing
1063 other than Emacs changes the files, you can set this variable to `nil'.
1065 If a remote file is checked regularly, it might be a good idea to
1066 let-bind this variable to a value less than the interval between
1067 consecutive checks. For example:
1069 (defun display-time-file-nonempty-p (file)
1070 (let ((remote-file-name-inhibit-cache (- display-time-interval 5)))
1071 (and (file-exists-p file)
1072 (< 0 (nth 7 (file-attributes (file-chase-links file)))))))"
1073 :group 'files
1074 :version "24.1"
1075 :type `(choice
1076 (const :tag "Do not inhibit file name cache" nil)
1077 (const :tag "Do not use file name cache" t)
1078 (integer :tag "Do not use file name cache"
1079 :format "Do not use file name cache older then %v seconds"
1080 :value 10)))
1082 (defun file-local-copy (file)
1083 "Copy the file FILE into a temporary file on this machine.
1084 Returns the name of the local copy, or nil, if FILE is directly
1085 accessible."
1086 ;; This formerly had an optional BUFFER argument that wasn't used by
1087 ;; anything.
1088 (let ((handler (find-file-name-handler file 'file-local-copy)))
1089 (if handler
1090 (funcall handler 'file-local-copy file)
1091 nil)))
1093 (defun file-truename (filename &optional counter prev-dirs)
1094 "Return the truename of FILENAME.
1095 If FILENAME is not absolute, first expands it against `default-directory'.
1096 The truename of a file name is found by chasing symbolic links
1097 both at the level of the file and at the level of the directories
1098 containing it, until no links are left at any level.
1100 \(fn FILENAME)" ;; Don't document the optional arguments.
1101 ;; COUNTER and PREV-DIRS are only used in recursive calls.
1102 ;; COUNTER can be a cons cell whose car is the count of how many
1103 ;; more links to chase before getting an error.
1104 ;; PREV-DIRS can be a cons cell whose car is an alist
1105 ;; of truenames we've just recently computed.
1106 (cond ((or (string= filename "") (string= filename "~"))
1107 (setq filename (expand-file-name filename))
1108 (if (string= filename "")
1109 (setq filename "/")))
1110 ((and (string= (substring filename 0 1) "~")
1111 (string-match "~[^/]*/?" filename))
1112 (let ((first-part
1113 (substring filename 0 (match-end 0)))
1114 (rest (substring filename (match-end 0))))
1115 (setq filename (concat (expand-file-name first-part) rest)))))
1117 (or counter (setq counter (list 100)))
1118 (let (done
1119 ;; For speed, remove the ange-ftp completion handler from the list.
1120 ;; We know it's not needed here.
1121 ;; For even more speed, do this only on the outermost call.
1122 (file-name-handler-alist
1123 (if prev-dirs file-name-handler-alist
1124 (let ((tem (copy-sequence file-name-handler-alist)))
1125 (delq (rassq 'ange-ftp-completion-hook-function tem) tem)))))
1126 (or prev-dirs (setq prev-dirs (list nil)))
1128 ;; andrewi@harlequin.co.uk - on Windows, there is an issue with
1129 ;; case differences being ignored by the OS, and short "8.3 DOS"
1130 ;; name aliases existing for all files. (The short names are not
1131 ;; reported by directory-files, but can be used to refer to files.)
1132 ;; It seems appropriate for file-truename to resolve these issues in
1133 ;; the most natural way, which on Windows is to call the function
1134 ;; `w32-long-file-name' - this returns the exact name of a file as
1135 ;; it is stored on disk (expanding short name aliases with the full
1136 ;; name in the process).
1137 (if (eq system-type 'windows-nt)
1138 (unless (string-match "[[*?]" filename)
1139 ;; If filename exists, use its long name. If it doesn't
1140 ;; exist, the recursion below on the directory of filename
1141 ;; will drill down until we find a directory that exists,
1142 ;; and use the long name of that, with the extra
1143 ;; non-existent path components concatenated.
1144 (let ((longname (w32-long-file-name filename)))
1145 (if longname
1146 (setq filename longname)))))
1148 ;; If this file directly leads to a link, process that iteratively
1149 ;; so that we don't use lots of stack.
1150 (while (not done)
1151 (setcar counter (1- (car counter)))
1152 (if (< (car counter) 0)
1153 (error "Apparent cycle of symbolic links for %s" filename))
1154 (let ((handler (find-file-name-handler filename 'file-truename)))
1155 ;; For file name that has a special handler, call handler.
1156 ;; This is so that ange-ftp can save time by doing a no-op.
1157 (if handler
1158 (setq filename (funcall handler 'file-truename filename)
1159 done t)
1160 (let ((dir (or (file-name-directory filename) default-directory))
1161 target dirfile)
1162 ;; Get the truename of the directory.
1163 (setq dirfile (directory-file-name dir))
1164 ;; If these are equal, we have the (or a) root directory.
1165 (or (string= dir dirfile)
1166 (and (memq system-type '(windows-nt ms-dos cygwin))
1167 (eq (compare-strings dir 0 nil dirfile 0 nil t) t))
1168 ;; If this is the same dir we last got the truename for,
1169 ;; save time--don't recalculate.
1170 (if (assoc dir (car prev-dirs))
1171 (setq dir (cdr (assoc dir (car prev-dirs))))
1172 (let ((old dir)
1173 (new (file-name-as-directory (file-truename dirfile counter prev-dirs))))
1174 (setcar prev-dirs (cons (cons old new) (car prev-dirs)))
1175 (setq dir new))))
1176 (if (equal ".." (file-name-nondirectory filename))
1177 (setq filename
1178 (directory-file-name (file-name-directory (directory-file-name dir)))
1179 done t)
1180 (if (equal "." (file-name-nondirectory filename))
1181 (setq filename (directory-file-name dir)
1182 done t)
1183 ;; Put it back on the file name.
1184 (setq filename (concat dir (file-name-nondirectory filename)))
1185 ;; Is the file name the name of a link?
1186 (setq target (file-symlink-p filename))
1187 (if target
1188 ;; Yes => chase that link, then start all over
1189 ;; since the link may point to a directory name that uses links.
1190 ;; We can't safely use expand-file-name here
1191 ;; since target might look like foo/../bar where foo
1192 ;; is itself a link. Instead, we handle . and .. above.
1193 (setq filename
1194 (if (file-name-absolute-p target)
1195 target
1196 (concat dir target))
1197 done nil)
1198 ;; No, we are done!
1199 (setq done t))))))))
1200 filename))
1202 (defun file-chase-links (filename &optional limit)
1203 "Chase links in FILENAME until a name that is not a link.
1204 Unlike `file-truename', this does not check whether a parent
1205 directory name is a symbolic link.
1206 If the optional argument LIMIT is a number,
1207 it means chase no more than that many links and then stop."
1208 (let (tem (newname filename)
1209 (count 0))
1210 (while (and (or (null limit) (< count limit))
1211 (setq tem (file-symlink-p newname)))
1212 (save-match-data
1213 (if (and (null limit) (= count 100))
1214 (error "Apparent cycle of symbolic links for %s" filename))
1215 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
1216 (while (string-match "//+" tem)
1217 (setq tem (replace-match "/" nil nil tem)))
1218 ;; Handle `..' by hand, since it needs to work in the
1219 ;; target of any directory symlink.
1220 ;; This code is not quite complete; it does not handle
1221 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
1222 (while (string-match "\\`\\.\\./" tem)
1223 (setq tem (substring tem 3))
1224 (setq newname (expand-file-name newname))
1225 ;; Chase links in the default dir of the symlink.
1226 (setq newname
1227 (file-chase-links
1228 (directory-file-name (file-name-directory newname))))
1229 ;; Now find the parent of that dir.
1230 (setq newname (file-name-directory newname)))
1231 (setq newname (expand-file-name tem (file-name-directory newname)))
1232 (setq count (1+ count))))
1233 newname))
1235 ;; A handy function to display file sizes in human-readable form.
1236 ;; See http://en.wikipedia.org/wiki/Kibibyte for the reference.
1237 (defun file-size-human-readable (file-size &optional flavor)
1238 "Produce a string showing FILE-SIZE in human-readable form.
1240 Optional second argument FLAVOR controls the units and the display format:
1242 If FLAVOR is nil or omitted, each kilobyte is 1024 bytes and the produced
1243 suffixes are \"k\", \"M\", \"G\", \"T\", etc.
1244 If FLAVOR is `si', each kilobyte is 1000 bytes and the produced suffixes
1245 are \"k\", \"M\", \"G\", \"T\", etc.
1246 If FLAVOR is `iec', each kilobyte is 1024 bytes and the produced suffixes
1247 are \"KiB\", \"MiB\", \"GiB\", \"TiB\", etc."
1248 (let ((power (if (or (null flavor) (eq flavor 'iec))
1249 1024.0
1250 1000.0))
1251 (post-fixes
1252 ;; none, kilo, mega, giga, tera, peta, exa, zetta, yotta
1253 (list "" "k" "M" "G" "T" "P" "E" "Z" "Y")))
1254 (while (and (>= file-size power) (cdr post-fixes))
1255 (setq file-size (/ file-size power)
1256 post-fixes (cdr post-fixes)))
1257 (format (if (> (mod file-size 1.0) 0.05)
1258 "%.1f%s%s"
1259 "%.0f%s%s")
1260 file-size
1261 (if (and (eq flavor 'iec) (string= (car post-fixes) "k"))
1263 (car post-fixes))
1264 (if (eq flavor 'iec) "iB" ""))))
1266 (defun make-temp-file (prefix &optional dir-flag suffix)
1267 "Create a temporary file.
1268 The returned file name (created by appending some random characters at the end
1269 of PREFIX, and expanding against `temporary-file-directory' if necessary),
1270 is guaranteed to point to a newly created empty file.
1271 You can then use `write-region' to write new data into the file.
1273 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1275 If SUFFIX is non-nil, add that at the end of the file name."
1276 (let ((umask (default-file-modes))
1277 file)
1278 (unwind-protect
1279 (progn
1280 ;; Create temp files with strict access rights. It's easy to
1281 ;; loosen them later, whereas it's impossible to close the
1282 ;; time-window of loose permissions otherwise.
1283 (set-default-file-modes ?\700)
1284 (while (condition-case ()
1285 (progn
1286 (setq file
1287 (make-temp-name
1288 (if (zerop (length prefix))
1289 (file-name-as-directory
1290 temporary-file-directory)
1291 (expand-file-name prefix
1292 temporary-file-directory))))
1293 (if suffix
1294 (setq file (concat file suffix)))
1295 (if dir-flag
1296 (make-directory file)
1297 (write-region "" nil file nil 'silent nil 'excl))
1298 nil)
1299 (file-already-exists t))
1300 ;; the file was somehow created by someone else between
1301 ;; `make-temp-name' and `write-region', let's try again.
1302 nil)
1303 file)
1304 ;; Reset the umask.
1305 (set-default-file-modes umask))))
1307 (defun recode-file-name (file coding new-coding &optional ok-if-already-exists)
1308 "Change the encoding of FILE's name from CODING to NEW-CODING.
1309 The value is a new name of FILE.
1310 Signals a `file-already-exists' error if a file of the new name
1311 already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
1312 is non-nil. A number as fourth arg means request confirmation if
1313 the new name already exists. This is what happens in interactive
1314 use with M-x."
1315 (interactive
1316 (let ((default-coding (or file-name-coding-system
1317 default-file-name-coding-system))
1318 (filename (read-file-name "Recode filename: " nil nil t))
1319 from-coding to-coding)
1320 (if (and default-coding
1321 ;; We provide the default coding only when it seems that
1322 ;; the filename is correctly decoded by the default
1323 ;; coding.
1324 (let ((charsets (find-charset-string filename)))
1325 (and (not (memq 'eight-bit-control charsets))
1326 (not (memq 'eight-bit-graphic charsets)))))
1327 (setq from-coding (read-coding-system
1328 (format "Recode filename %s from (default %s): "
1329 filename default-coding)
1330 default-coding))
1331 (setq from-coding (read-coding-system
1332 (format "Recode filename %s from: " filename))))
1334 ;; We provide the default coding only when a user is going to
1335 ;; change the encoding not from the default coding.
1336 (if (eq from-coding default-coding)
1337 (setq to-coding (read-coding-system
1338 (format "Recode filename %s from %s to: "
1339 filename from-coding)))
1340 (setq to-coding (read-coding-system
1341 (format "Recode filename %s from %s to (default %s): "
1342 filename from-coding default-coding)
1343 default-coding)))
1344 (list filename from-coding to-coding)))
1346 (let* ((default-coding (or file-name-coding-system
1347 default-file-name-coding-system))
1348 ;; FILE should have been decoded by DEFAULT-CODING.
1349 (encoded (encode-coding-string file default-coding))
1350 (newname (decode-coding-string encoded coding))
1351 (new-encoded (encode-coding-string newname new-coding))
1352 ;; Suppress further encoding.
1353 (file-name-coding-system nil)
1354 (default-file-name-coding-system nil)
1355 (locale-coding-system nil))
1356 (rename-file encoded new-encoded ok-if-already-exists)
1357 newname))
1359 (defcustom confirm-nonexistent-file-or-buffer 'after-completion
1360 "Whether confirmation is requested before visiting a new file or buffer.
1361 If nil, confirmation is not requested.
1362 If the value is `after-completion', confirmation is only
1363 requested if the user called `minibuffer-complete' right before
1364 `minibuffer-complete-and-exit'.
1365 Any other non-nil value means to request confirmation.
1367 This affects commands like `switch-to-buffer' and `find-file'."
1368 :group 'find-file
1369 :version "23.1"
1370 :type '(choice (const :tag "After completion" after-completion)
1371 (const :tag "Never" nil)
1372 (other :tag "Always" t)))
1374 (defun confirm-nonexistent-file-or-buffer ()
1375 "Whether to request confirmation before visiting a new file or buffer.
1376 The variable `confirm-nonexistent-file-or-buffer' determines the
1377 return value, which may be passed as the REQUIRE-MATCH arg to
1378 `read-buffer' or `find-file-read-args'."
1379 (cond ((eq confirm-nonexistent-file-or-buffer 'after-completion)
1380 'confirm-after-completion)
1381 (confirm-nonexistent-file-or-buffer
1382 'confirm)
1383 (t nil)))
1385 (defmacro minibuffer-with-setup-hook (fun &rest body)
1386 "Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
1387 BODY should use the minibuffer at most once.
1388 Recursive uses of the minibuffer are unaffected (FUN is not
1389 called additional times).
1391 This macro actually adds an auxiliary function that calls FUN,
1392 rather than FUN itself, to `minibuffer-setup-hook'."
1393 (declare (indent 1) (debug t))
1394 (let ((hook (make-symbol "setup-hook")))
1395 `(let (,hook)
1396 (setq ,hook
1397 (lambda ()
1398 ;; Clear out this hook so it does not interfere
1399 ;; with any recursive minibuffer usage.
1400 (remove-hook 'minibuffer-setup-hook ,hook)
1401 (funcall ,fun)))
1402 (unwind-protect
1403 (progn
1404 (add-hook 'minibuffer-setup-hook ,hook)
1405 ,@body)
1406 (remove-hook 'minibuffer-setup-hook ,hook)))))
1408 (defun find-file-read-args (prompt mustmatch)
1409 (list (read-file-name prompt nil default-directory mustmatch)
1412 (defun find-file (filename &optional wildcards)
1413 "Edit file FILENAME.
1414 Switch to a buffer visiting file FILENAME,
1415 creating one if none already exists.
1416 Interactively, the default if you just type RET is the current directory,
1417 but the visited file name is available through the minibuffer history:
1418 type M-n to pull it into the minibuffer.
1420 You can visit files on remote machines by specifying something
1421 like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
1422 also visit local files as a different user by specifying
1423 /sudo::FILE for the file name.
1424 See the Info node `(tramp)File name Syntax' in the Tramp Info
1425 manual, for more about this.
1427 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1428 expand wildcards (if any) and visit multiple files. You can
1429 suppress wildcard expansion by setting `find-file-wildcards' to nil.
1431 To visit a file without any kind of conversion and without
1432 automatically choosing a major mode, use \\[find-file-literally]."
1433 (interactive
1434 (find-file-read-args "Find file: "
1435 (confirm-nonexistent-file-or-buffer)))
1436 (let ((value (find-file-noselect filename nil nil wildcards)))
1437 (if (listp value)
1438 (mapcar 'switch-to-buffer (nreverse value))
1439 (switch-to-buffer value))))
1441 (defun find-file-other-window (filename &optional wildcards)
1442 "Edit file FILENAME, in another window.
1444 Like \\[find-file] (which see), but creates a new window or reuses
1445 an existing one. See the function `display-buffer'.
1447 Interactively, the default if you just type RET is the current directory,
1448 but the visited file name is available through the minibuffer history:
1449 type M-n to pull it into the minibuffer.
1451 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1452 expand wildcards (if any) and visit multiple files."
1453 (interactive
1454 (find-file-read-args "Find file in other window: "
1455 (confirm-nonexistent-file-or-buffer)))
1456 (let ((value (find-file-noselect filename nil nil wildcards)))
1457 (if (listp value)
1458 (progn
1459 (setq value (nreverse value))
1460 (cons (switch-to-buffer-other-window (car value))
1461 (mapcar 'switch-to-buffer (cdr value))))
1462 (switch-to-buffer-other-window value))))
1464 (defun find-file-other-frame (filename &optional wildcards)
1465 "Edit file FILENAME, in another frame.
1467 Like \\[find-file] (which see), but creates a new frame or reuses
1468 an existing one. See the function `display-buffer'.
1470 Interactively, the default if you just type RET is the current directory,
1471 but the visited file name is available through the minibuffer history:
1472 type M-n to pull it into the minibuffer.
1474 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1475 expand wildcards (if any) and visit multiple files."
1476 (interactive
1477 (find-file-read-args "Find file in other frame: "
1478 (confirm-nonexistent-file-or-buffer)))
1479 (let ((value (find-file-noselect filename nil nil wildcards)))
1480 (if (listp value)
1481 (progn
1482 (setq value (nreverse value))
1483 (cons (switch-to-buffer-other-frame (car value))
1484 (mapcar 'switch-to-buffer (cdr value))))
1485 (switch-to-buffer-other-frame value))))
1487 (defun find-file-existing (filename)
1488 "Edit the existing file FILENAME.
1489 Like \\[find-file], but only allow a file that exists, and do not allow
1490 file names with wildcards."
1491 (interactive (nbutlast (find-file-read-args "Find existing file: " t)))
1492 (if (and (not (called-interactively-p 'interactive))
1493 (not (file-exists-p filename)))
1494 (error "%s does not exist" filename)
1495 (find-file filename)
1496 (current-buffer)))
1498 (defun find-file--read-only (fun filename wildcards)
1499 (unless (or (and wildcards find-file-wildcards
1500 (not (string-match "\\`/:" filename))
1501 (string-match "[[*?]" filename))
1502 (file-exists-p filename))
1503 (error "%s does not exist" filename))
1504 (let ((value (funcall fun filename wildcards)))
1505 (mapc (lambda (b) (with-current-buffer b (read-only-mode 1)))
1506 (if (listp value) value (list value)))
1507 value))
1509 (defun find-file-read-only (filename &optional wildcards)
1510 "Edit file FILENAME but don't allow changes.
1511 Like \\[find-file], but marks buffer as read-only.
1512 Use \\[toggle-read-only] to permit editing."
1513 (interactive
1514 (find-file-read-args "Find file read-only: "
1515 (confirm-nonexistent-file-or-buffer)))
1516 (find-file--read-only #'find-file filename wildcards))
1518 (defun find-file-read-only-other-window (filename &optional wildcards)
1519 "Edit file FILENAME in another window but don't allow changes.
1520 Like \\[find-file-other-window], but marks buffer as read-only.
1521 Use \\[toggle-read-only] to permit editing."
1522 (interactive
1523 (find-file-read-args "Find file read-only other window: "
1524 (confirm-nonexistent-file-or-buffer)))
1525 (find-file--read-only #'find-file-other-window filename wildcards))
1527 (defun find-file-read-only-other-frame (filename &optional wildcards)
1528 "Edit file FILENAME in another frame but don't allow changes.
1529 Like \\[find-file-other-frame], but marks buffer as read-only.
1530 Use \\[toggle-read-only] to permit editing."
1531 (interactive
1532 (find-file-read-args "Find file read-only other frame: "
1533 (confirm-nonexistent-file-or-buffer)))
1534 (find-file--read-only #'find-file-other-frame filename wildcards))
1536 (defun find-alternate-file-other-window (filename &optional wildcards)
1537 "Find file FILENAME as a replacement for the file in the next window.
1538 This command does not select that window.
1540 See \\[find-file] for the possible forms of the FILENAME argument.
1542 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1543 expand wildcards (if any) and replace the file with multiple files."
1544 (interactive
1545 (save-selected-window
1546 (other-window 1)
1547 (let ((file buffer-file-name)
1548 (file-name nil)
1549 (file-dir nil))
1550 (and file
1551 (setq file-name (file-name-nondirectory file)
1552 file-dir (file-name-directory file)))
1553 (list (read-file-name
1554 "Find alternate file: " file-dir nil
1555 (confirm-nonexistent-file-or-buffer) file-name)
1556 t))))
1557 (if (one-window-p)
1558 (find-file-other-window filename wildcards)
1559 (save-selected-window
1560 (other-window 1)
1561 (find-alternate-file filename wildcards))))
1563 ;; Defined and used in buffer.c, but not as a DEFVAR_LISP.
1564 (defvar kill-buffer-hook nil
1565 "Hook run when a buffer is killed.
1566 The buffer being killed is current while the hook is running.
1567 See `kill-buffer'.
1569 Note: Be careful with let-binding this hook considering it is
1570 frequently used for cleanup.")
1572 (defun find-alternate-file (filename &optional wildcards)
1573 "Find file FILENAME, select its buffer, kill previous buffer.
1574 If the current buffer now contains an empty file that you just visited
1575 \(presumably by mistake), use this command to visit the file you really want.
1577 See \\[find-file] for the possible forms of the FILENAME argument.
1579 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1580 expand wildcards (if any) and replace the file with multiple files.
1582 If the current buffer is an indirect buffer, or the base buffer
1583 for one or more indirect buffers, the other buffer(s) are not
1584 killed."
1585 (interactive
1586 (let ((file buffer-file-name)
1587 (file-name nil)
1588 (file-dir nil))
1589 (and file
1590 (setq file-name (file-name-nondirectory file)
1591 file-dir (file-name-directory file)))
1592 (list (read-file-name
1593 "Find alternate file: " file-dir nil
1594 (confirm-nonexistent-file-or-buffer) file-name)
1595 t)))
1596 (unless (run-hook-with-args-until-failure 'kill-buffer-query-functions)
1597 (error "Aborted"))
1598 (and (buffer-modified-p) buffer-file-name
1599 (not (yes-or-no-p "Kill and replace the buffer without saving it? "))
1600 (error "Aborted"))
1601 (let ((obuf (current-buffer))
1602 (ofile buffer-file-name)
1603 (onum buffer-file-number)
1604 (odir dired-directory)
1605 (otrue buffer-file-truename)
1606 (oname (buffer-name)))
1607 ;; Run `kill-buffer-hook' here. It needs to happen before
1608 ;; variables like `buffer-file-name' etc are set to nil below,
1609 ;; because some of the hooks that could be invoked
1610 ;; (e.g., `save-place-to-alist') depend on those variables.
1612 ;; Note that `kill-buffer-hook' is not what queries whether to
1613 ;; save a modified buffer visiting a file. Rather, `kill-buffer'
1614 ;; asks that itself. Thus, there's no need to temporarily do
1615 ;; `(set-buffer-modified-p nil)' before running this hook.
1616 (run-hooks 'kill-buffer-hook)
1617 ;; Okay, now we can end-of-life the old buffer.
1618 (if (get-buffer " **lose**")
1619 (kill-buffer " **lose**"))
1620 (rename-buffer " **lose**")
1621 (unwind-protect
1622 (progn
1623 (unlock-buffer)
1624 ;; This prevents us from finding the same buffer
1625 ;; if we specified the same file again.
1626 (setq buffer-file-name nil)
1627 (setq buffer-file-number nil)
1628 (setq buffer-file-truename nil)
1629 ;; Likewise for dired buffers.
1630 (setq dired-directory nil)
1631 (find-file filename wildcards))
1632 (when (eq obuf (current-buffer))
1633 ;; This executes if find-file gets an error
1634 ;; and does not really find anything.
1635 ;; We put things back as they were.
1636 ;; If find-file actually finds something, we kill obuf below.
1637 (setq buffer-file-name ofile)
1638 (setq buffer-file-number onum)
1639 (setq buffer-file-truename otrue)
1640 (setq dired-directory odir)
1641 (lock-buffer)
1642 (rename-buffer oname)))
1643 (unless (eq (current-buffer) obuf)
1644 (with-current-buffer obuf
1645 ;; We already ran these; don't run them again.
1646 (let (kill-buffer-query-functions kill-buffer-hook)
1647 (kill-buffer obuf))))))
1649 (defun create-file-buffer (filename)
1650 "Create a suitably named buffer for visiting FILENAME, and return it.
1651 FILENAME (sans directory) is used unchanged if that name is free;
1652 otherwise a string <2> or <3> or ... is appended to get an unused name.
1654 Emacs treats buffers whose names begin with a space as internal buffers.
1655 To avoid confusion when visiting a file whose name begins with a space,
1656 this function prepends a \"|\" to the final result if necessary."
1657 (let ((lastname (file-name-nondirectory filename)))
1658 (if (string= lastname "")
1659 (setq lastname filename))
1660 (generate-new-buffer (if (string-match-p "\\` " lastname)
1661 (concat "|" lastname)
1662 lastname))))
1664 (defun generate-new-buffer (name)
1665 "Create and return a buffer with a name based on NAME.
1666 Choose the buffer's name using `generate-new-buffer-name'."
1667 (get-buffer-create (generate-new-buffer-name name)))
1669 (defcustom automount-dir-prefix (purecopy "^/tmp_mnt/")
1670 "Regexp to match the automounter prefix in a directory name."
1671 :group 'files
1672 :type 'regexp)
1673 (make-obsolete-variable 'automount-dir-prefix 'directory-abbrev-alist "24.3")
1675 (defvar abbreviated-home-dir nil
1676 "The user's homedir abbreviated according to `directory-abbrev-alist'.")
1678 (defun abbreviate-file-name (filename)
1679 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1680 This also substitutes \"~\" for the user's home directory (unless the
1681 home directory is a root directory) and removes automounter prefixes
1682 \(see the variable `automount-dir-prefix')."
1683 ;; Get rid of the prefixes added by the automounter.
1684 (save-match-data
1685 (if (and automount-dir-prefix
1686 (string-match automount-dir-prefix filename)
1687 (file-exists-p (file-name-directory
1688 (substring filename (1- (match-end 0))))))
1689 (setq filename (substring filename (1- (match-end 0)))))
1690 ;; Avoid treating /home/foo as /home/Foo during `~' substitution.
1691 ;; To fix this right, we need a `file-name-case-sensitive-p'
1692 ;; function, but we don't have that yet, so just guess.
1693 (let ((case-fold-search
1694 (memq system-type '(ms-dos windows-nt darwin cygwin))))
1695 ;; If any elt of directory-abbrev-alist matches this name,
1696 ;; abbreviate accordingly.
1697 (dolist (dir-abbrev directory-abbrev-alist)
1698 (if (string-match (car dir-abbrev) filename)
1699 (setq filename
1700 (concat (cdr dir-abbrev)
1701 (substring filename (match-end 0))))))
1702 ;; Compute and save the abbreviated homedir name.
1703 ;; We defer computing this until the first time it's needed, to
1704 ;; give time for directory-abbrev-alist to be set properly.
1705 ;; We include a slash at the end, to avoid spurious matches
1706 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1707 (or abbreviated-home-dir
1708 (setq abbreviated-home-dir
1709 (let ((abbreviated-home-dir "$foo"))
1710 (concat "\\`" (abbreviate-file-name (expand-file-name "~"))
1711 "\\(/\\|\\'\\)"))))
1713 ;; If FILENAME starts with the abbreviated homedir,
1714 ;; make it start with `~' instead.
1715 (if (and (string-match abbreviated-home-dir filename)
1716 ;; If the home dir is just /, don't change it.
1717 (not (and (= (match-end 0) 1)
1718 (= (aref filename 0) ?/)))
1719 ;; MS-DOS root directories can come with a drive letter;
1720 ;; Novell Netware allows drive letters beyond `Z:'.
1721 (not (and (memq system-type '(ms-dos windows-nt cygwin))
1722 (save-match-data
1723 (string-match "^[a-zA-`]:/$" filename)))))
1724 (setq filename
1725 (concat "~"
1726 (match-string 1 filename)
1727 (substring filename (match-end 0)))))
1728 filename)))
1730 (defun find-buffer-visiting (filename &optional predicate)
1731 "Return the buffer visiting file FILENAME (a string).
1732 This is like `get-file-buffer', except that it checks for any buffer
1733 visiting the same file, possibly under a different name.
1734 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1735 and others are ignored.
1736 If there is no such live buffer, return nil."
1737 (let ((predicate (or predicate #'identity))
1738 (truename (abbreviate-file-name (file-truename filename))))
1739 (or (let ((buf (get-file-buffer filename)))
1740 (when (and buf (funcall predicate buf)) buf))
1741 (let ((list (buffer-list)) found)
1742 (while (and (not found) list)
1743 (with-current-buffer (car list)
1744 (if (and buffer-file-name
1745 (string= buffer-file-truename truename)
1746 (funcall predicate (current-buffer)))
1747 (setq found (car list))))
1748 (setq list (cdr list)))
1749 found)
1750 (let* ((attributes (file-attributes truename))
1751 (number (nthcdr 10 attributes))
1752 (list (buffer-list)) found)
1753 (and buffer-file-numbers-unique
1754 (car-safe number) ;Make sure the inode is not just nil.
1755 (while (and (not found) list)
1756 (with-current-buffer (car list)
1757 (if (and buffer-file-name
1758 (equal buffer-file-number number)
1759 ;; Verify this buffer's file number
1760 ;; still belongs to its file.
1761 (file-exists-p buffer-file-name)
1762 (equal (file-attributes buffer-file-truename)
1763 attributes)
1764 (funcall predicate (current-buffer)))
1765 (setq found (car list))))
1766 (setq list (cdr list))))
1767 found))))
1769 (defcustom find-file-wildcards t
1770 "Non-nil means file-visiting commands should handle wildcards.
1771 For example, if you specify `*.c', that would visit all the files
1772 whose names match the pattern."
1773 :group 'files
1774 :version "20.4"
1775 :type 'boolean)
1777 (defcustom find-file-suppress-same-file-warnings nil
1778 "Non-nil means suppress warning messages for symlinked files.
1779 When nil, Emacs prints a warning when visiting a file that is already
1780 visited, but with a different name. Setting this option to t
1781 suppresses this warning."
1782 :group 'files
1783 :version "21.1"
1784 :type 'boolean)
1786 (defcustom large-file-warning-threshold 10000000
1787 "Maximum size of file above which a confirmation is requested.
1788 When nil, never request confirmation."
1789 :group 'files
1790 :group 'find-file
1791 :version "22.1"
1792 :type '(choice integer (const :tag "Never request confirmation" nil)))
1794 (defun abort-if-file-too-large (size op-type filename)
1795 "If file SIZE larger than `large-file-warning-threshold', allow user to abort.
1796 OP-TYPE specifies the file operation being performed (for message to user)."
1797 (when (and large-file-warning-threshold size
1798 (> size large-file-warning-threshold)
1799 (not (y-or-n-p (format "File %s is large (%s), really %s? "
1800 (file-name-nondirectory filename)
1801 (file-size-human-readable size) op-type))))
1802 (error "Aborted")))
1804 (defun find-file-noselect (filename &optional nowarn rawfile wildcards)
1805 "Read file FILENAME into a buffer and return the buffer.
1806 If a buffer exists visiting FILENAME, return that one, but
1807 verify that the file has not changed since visited or saved.
1808 The buffer is not selected, just returned to the caller.
1809 Optional second arg NOWARN non-nil means suppress any warning messages.
1810 Optional third arg RAWFILE non-nil means the file is read literally.
1811 Optional fourth arg WILDCARDS non-nil means do wildcard processing
1812 and visit all the matching files. When wildcards are actually
1813 used and expanded, return a list of buffers that are visiting
1814 the various files."
1815 (setq filename
1816 (abbreviate-file-name
1817 (expand-file-name filename)))
1818 (if (file-directory-p filename)
1819 (or (and find-file-run-dired
1820 (run-hook-with-args-until-success
1821 'find-directory-functions
1822 (if find-file-visit-truename
1823 (abbreviate-file-name (file-truename filename))
1824 filename)))
1825 (error "%s is a directory" filename))
1826 (if (and wildcards
1827 find-file-wildcards
1828 (not (string-match "\\`/:" filename))
1829 (string-match "[[*?]" filename))
1830 (let ((files (condition-case nil
1831 (file-expand-wildcards filename t)
1832 (error (list filename))))
1833 (find-file-wildcards nil))
1834 (if (null files)
1835 (find-file-noselect filename)
1836 (mapcar #'find-file-noselect files)))
1837 (let* ((buf (get-file-buffer filename))
1838 (truename (abbreviate-file-name (file-truename filename)))
1839 (attributes (file-attributes truename))
1840 (number (nthcdr 10 attributes))
1841 ;; Find any buffer for a file which has same truename.
1842 (other (and (not buf) (find-buffer-visiting filename))))
1843 ;; Let user know if there is a buffer with the same truename.
1844 (if other
1845 (progn
1846 (or nowarn
1847 find-file-suppress-same-file-warnings
1848 (string-equal filename (buffer-file-name other))
1849 (message "%s and %s are the same file"
1850 filename (buffer-file-name other)))
1851 ;; Optionally also find that buffer.
1852 (if (or find-file-existing-other-name find-file-visit-truename)
1853 (setq buf other))))
1854 ;; Check to see if the file looks uncommonly large.
1855 (when (not (or buf nowarn))
1856 (abort-if-file-too-large (nth 7 attributes) "open" filename))
1857 (if buf
1858 ;; We are using an existing buffer.
1859 (let (nonexistent)
1860 (or nowarn
1861 (verify-visited-file-modtime buf)
1862 (cond ((not (file-exists-p filename))
1863 (setq nonexistent t)
1864 (message "File %s no longer exists!" filename))
1865 ;; Certain files should be reverted automatically
1866 ;; if they have changed on disk and not in the buffer.
1867 ((and (not (buffer-modified-p buf))
1868 (let ((tail revert-without-query)
1869 (found nil))
1870 (while tail
1871 (if (string-match (car tail) filename)
1872 (setq found t))
1873 (setq tail (cdr tail)))
1874 found))
1875 (with-current-buffer buf
1876 (message "Reverting file %s..." filename)
1877 (revert-buffer t t)
1878 (message "Reverting file %s...done" filename)))
1879 ((yes-or-no-p
1880 (if (string= (file-name-nondirectory filename)
1881 (buffer-name buf))
1882 (format
1883 (if (buffer-modified-p buf)
1884 "File %s changed on disk. Discard your edits? "
1885 "File %s changed on disk. Reread from disk? ")
1886 (file-name-nondirectory filename))
1887 (format
1888 (if (buffer-modified-p buf)
1889 "File %s changed on disk. Discard your edits in %s? "
1890 "File %s changed on disk. Reread from disk into %s? ")
1891 (file-name-nondirectory filename)
1892 (buffer-name buf))))
1893 (with-current-buffer buf
1894 (revert-buffer t t)))))
1895 (with-current-buffer buf
1897 ;; Check if a formerly read-only file has become
1898 ;; writable and vice versa, but if the buffer agrees
1899 ;; with the new state of the file, that is ok too.
1900 (let ((read-only (not (file-writable-p buffer-file-name))))
1901 (unless (or nonexistent
1902 (eq read-only buffer-file-read-only)
1903 (eq read-only buffer-read-only))
1904 (when (or nowarn
1905 (let* ((new-status
1906 (if read-only "read-only" "writable"))
1907 (question
1908 (format "File %s is %s on disk. Make buffer %s, too? "
1909 buffer-file-name
1910 new-status new-status)))
1911 (y-or-n-p question)))
1912 (setq buffer-read-only read-only)))
1913 (setq buffer-file-read-only read-only))
1915 (unless (or (eq (null rawfile) (null find-file-literally))
1916 nonexistent
1917 ;; It is confusing to ask whether to visit
1918 ;; non-literally if they have the file in
1919 ;; hexl-mode or image-mode.
1920 (memq major-mode '(hexl-mode image-mode)))
1921 (if (buffer-modified-p)
1922 (if (y-or-n-p
1923 (format
1924 (if rawfile
1925 "The file %s is already visited normally,
1926 and you have edited the buffer. Now you have asked to visit it literally,
1927 meaning no coding system handling, format conversion, or local variables.
1928 Emacs can only visit a file in one way at a time.
1930 Do you want to save the file, and visit it literally instead? "
1931 "The file %s is already visited literally,
1932 meaning no coding system handling, format conversion, or local variables.
1933 You have edited the buffer. Now you have asked to visit the file normally,
1934 but Emacs can only visit a file in one way at a time.
1936 Do you want to save the file, and visit it normally instead? ")
1937 (file-name-nondirectory filename)))
1938 (progn
1939 (save-buffer)
1940 (find-file-noselect-1 buf filename nowarn
1941 rawfile truename number))
1942 (if (y-or-n-p
1943 (format
1944 (if rawfile
1946 Do you want to discard your changes, and visit the file literally now? "
1948 Do you want to discard your changes, and visit the file normally now? ")))
1949 (find-file-noselect-1 buf filename nowarn
1950 rawfile truename number)
1951 (error (if rawfile "File already visited non-literally"
1952 "File already visited literally"))))
1953 (if (y-or-n-p
1954 (format
1955 (if rawfile
1956 "The file %s is already visited normally.
1957 You have asked to visit it literally,
1958 meaning no coding system decoding, format conversion, or local variables.
1959 But Emacs can only visit a file in one way at a time.
1961 Do you want to revisit the file literally now? "
1962 "The file %s is already visited literally,
1963 meaning no coding system decoding, format conversion, or local variables.
1964 You have asked to visit it normally,
1965 but Emacs can only visit a file in one way at a time.
1967 Do you want to revisit the file normally now? ")
1968 (file-name-nondirectory filename)))
1969 (find-file-noselect-1 buf filename nowarn
1970 rawfile truename number)
1971 (error (if rawfile "File already visited non-literally"
1972 "File already visited literally"))))))
1973 ;; Return the buffer we are using.
1974 buf)
1975 ;; Create a new buffer.
1976 (setq buf (create-file-buffer filename))
1977 ;; find-file-noselect-1 may use a different buffer.
1978 (find-file-noselect-1 buf filename nowarn
1979 rawfile truename number))))))
1981 (defun find-file-noselect-1 (buf filename nowarn rawfile truename number)
1982 (let (error)
1983 (with-current-buffer buf
1984 (kill-local-variable 'find-file-literally)
1985 ;; Needed in case we are re-visiting the file with a different
1986 ;; text representation.
1987 (kill-local-variable 'buffer-file-coding-system)
1988 (kill-local-variable 'cursor-type)
1989 (let ((inhibit-read-only t))
1990 (erase-buffer))
1991 (and (default-value 'enable-multibyte-characters)
1992 (not rawfile)
1993 (set-buffer-multibyte t))
1994 (if rawfile
1995 (condition-case ()
1996 (let ((inhibit-read-only t))
1997 (insert-file-contents-literally filename t))
1998 (file-error
1999 (when (and (file-exists-p filename)
2000 (not (file-readable-p filename)))
2001 (kill-buffer buf)
2002 (signal 'file-error (list "File is not readable"
2003 filename)))
2004 ;; Unconditionally set error
2005 (setq error t)))
2006 (condition-case ()
2007 (let ((inhibit-read-only t))
2008 (insert-file-contents filename t))
2009 (file-error
2010 (when (and (file-exists-p filename)
2011 (not (file-readable-p filename)))
2012 (kill-buffer buf)
2013 (signal 'file-error (list "File is not readable"
2014 filename)))
2015 ;; Run find-file-not-found-functions until one returns non-nil.
2016 (or (run-hook-with-args-until-success 'find-file-not-found-functions)
2017 ;; If they fail too, set error.
2018 (setq error t)))))
2019 ;; Record the file's truename, and maybe use that as visited name.
2020 (if (equal filename buffer-file-name)
2021 (setq buffer-file-truename truename)
2022 (setq buffer-file-truename
2023 (abbreviate-file-name (file-truename buffer-file-name))))
2024 (setq buffer-file-number number)
2025 (if find-file-visit-truename
2026 (setq buffer-file-name (expand-file-name buffer-file-truename)))
2027 ;; Set buffer's default directory to that of the file.
2028 (setq default-directory (file-name-directory buffer-file-name))
2029 ;; Turn off backup files for certain file names. Since
2030 ;; this is a permanent local, the major mode won't eliminate it.
2031 (and backup-enable-predicate
2032 (not (funcall backup-enable-predicate buffer-file-name))
2033 (progn
2034 (make-local-variable 'backup-inhibited)
2035 (setq backup-inhibited t)))
2036 (if rawfile
2037 (progn
2038 (set-buffer-multibyte nil)
2039 (setq buffer-file-coding-system 'no-conversion)
2040 (set-buffer-major-mode buf)
2041 (setq-local find-file-literally t))
2042 (after-find-file error (not nowarn)))
2043 (current-buffer))))
2045 (defun insert-file-contents-literally (filename &optional visit beg end replace)
2046 "Like `insert-file-contents', but only reads in the file literally.
2047 A buffer may be modified in several ways after reading into the buffer,
2048 to Emacs features such as format decoding, character code
2049 conversion, `find-file-hook', automatic uncompression, etc.
2051 This function ensures that none of these modifications will take place."
2052 (let ((format-alist nil)
2053 (after-insert-file-functions nil)
2054 (coding-system-for-read 'no-conversion)
2055 (coding-system-for-write 'no-conversion)
2056 (inhibit-file-name-handlers
2057 ;; FIXME: Yuck!! We should turn insert-file-contents-literally
2058 ;; into a file operation instead!
2059 (append '(jka-compr-handler image-file-handler epa-file-handler)
2060 inhibit-file-name-handlers))
2061 (inhibit-file-name-operation 'insert-file-contents))
2062 (insert-file-contents filename visit beg end replace)))
2064 (defun insert-file-1 (filename insert-func)
2065 (if (file-directory-p filename)
2066 (signal 'file-error (list "Opening input file" "file is a directory"
2067 filename)))
2068 ;; Check whether the file is uncommonly large
2069 (abort-if-file-too-large (nth 7 (file-attributes filename)) "insert" filename)
2070 (let* ((buffer (find-buffer-visiting (abbreviate-file-name (file-truename filename))
2071 #'buffer-modified-p))
2072 (tem (funcall insert-func filename)))
2073 (push-mark (+ (point) (car (cdr tem))))
2074 (when buffer
2075 (message "File %s already visited and modified in buffer %s"
2076 filename (buffer-name buffer)))))
2078 (defun insert-file-literally (filename)
2079 "Insert contents of file FILENAME into buffer after point with no conversion.
2081 This function is meant for the user to run interactively.
2082 Don't call it from programs! Use `insert-file-contents-literally' instead.
2083 \(Its calling sequence is different; see its documentation)."
2084 (declare (interactive-only insert-file-contents-literally))
2085 (interactive "*fInsert file literally: ")
2086 (insert-file-1 filename #'insert-file-contents-literally))
2088 (defvar find-file-literally nil
2089 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
2090 This has the `permanent-local' property, which takes effect if you
2091 make the variable buffer-local.")
2092 (put 'find-file-literally 'permanent-local t)
2094 (defun find-file-literally (filename)
2095 "Visit file FILENAME with no conversion of any kind.
2096 Format conversion and character code conversion are both disabled,
2097 and multibyte characters are disabled in the resulting buffer.
2098 The major mode used is Fundamental mode regardless of the file name,
2099 and local variable specifications in the file are ignored.
2100 Automatic uncompression and adding a newline at the end of the
2101 file due to `require-final-newline' is also disabled.
2103 You cannot absolutely rely on this function to result in
2104 visiting the file literally. If Emacs already has a buffer
2105 which is visiting the file, you get the existing buffer,
2106 regardless of whether it was created literally or not.
2108 In a Lisp program, if you want to be sure of accessing a file's
2109 contents literally, you should create a temporary buffer and then read
2110 the file contents into it using `insert-file-contents-literally'."
2111 (interactive
2112 (list (read-file-name
2113 "Find file literally: " nil default-directory
2114 (confirm-nonexistent-file-or-buffer))))
2115 (switch-to-buffer (find-file-noselect filename nil t)))
2117 (defun after-find-file (&optional error warn noauto
2118 _after-find-file-from-revert-buffer
2119 nomodes)
2120 "Called after finding a file and by the default revert function.
2121 Sets buffer mode, parses local variables.
2122 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
2123 error in reading the file. WARN non-nil means warn if there
2124 exists an auto-save file more recent than the visited file.
2125 NOAUTO means don't mess with auto-save mode.
2126 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER is ignored
2127 \(see `revert-buffer-in-progress-p' for similar functionality).
2128 Fifth arg NOMODES non-nil means don't alter the file's modes.
2129 Finishes by calling the functions in `find-file-hook'
2130 unless NOMODES is non-nil."
2131 (setq buffer-read-only (not (file-writable-p buffer-file-name)))
2132 (if noninteractive
2134 (let* (not-serious
2135 (msg
2136 (cond
2137 ((not warn) nil)
2138 ((and error (file-attributes buffer-file-name))
2139 (setq buffer-read-only t)
2140 (if (and (file-symlink-p buffer-file-name)
2141 (not (file-exists-p
2142 (file-chase-links buffer-file-name))))
2143 "Symbolic link that points to nonexistent file"
2144 "File exists, but cannot be read"))
2145 ((not buffer-read-only)
2146 (if (and warn
2147 ;; No need to warn if buffer is auto-saved
2148 ;; under the name of the visited file.
2149 (not (and buffer-file-name
2150 auto-save-visited-file-name))
2151 (file-newer-than-file-p (or buffer-auto-save-file-name
2152 (make-auto-save-file-name))
2153 buffer-file-name))
2154 (format "%s has auto save data; consider M-x recover-this-file"
2155 (file-name-nondirectory buffer-file-name))
2156 (setq not-serious t)
2157 (if error "(New file)" nil)))
2158 ((not error)
2159 (setq not-serious t)
2160 "Note: file is write protected")
2161 ((file-attributes (directory-file-name default-directory))
2162 "File not found and directory write-protected")
2163 ((file-exists-p (file-name-directory buffer-file-name))
2164 (setq buffer-read-only nil))
2166 (setq buffer-read-only nil)
2167 "Use M-x make-directory RET RET to create the directory and its parents"))))
2168 (when msg
2169 (message "%s" msg)
2170 (or not-serious (sit-for 1 t))))
2171 (when (and auto-save-default (not noauto))
2172 (auto-save-mode 1)))
2173 ;; Make people do a little extra work (C-x C-q)
2174 ;; before altering a backup file.
2175 (when (backup-file-name-p buffer-file-name)
2176 (setq buffer-read-only t))
2177 ;; When a file is marked read-only,
2178 ;; make the buffer read-only even if root is looking at it.
2179 (when (and (file-modes (buffer-file-name))
2180 (zerop (logand (file-modes (buffer-file-name)) #o222)))
2181 (setq buffer-read-only t))
2182 (unless nomodes
2183 (when (and view-read-only view-mode)
2184 (view-mode -1))
2185 (normal-mode t)
2186 ;; If requested, add a newline at the end of the file.
2187 (and (memq require-final-newline '(visit visit-save))
2188 (> (point-max) (point-min))
2189 (/= (char-after (1- (point-max))) ?\n)
2190 (not (and (eq selective-display t)
2191 (= (char-after (1- (point-max))) ?\r)))
2192 (not buffer-read-only)
2193 (save-excursion
2194 (goto-char (point-max))
2195 (ignore-errors (insert "\n"))))
2196 (when (and buffer-read-only
2197 view-read-only
2198 (not (eq (get major-mode 'mode-class) 'special)))
2199 (view-mode-enter))
2200 (run-hooks 'find-file-hook)))
2202 (defmacro report-errors (format &rest body)
2203 "Eval BODY and turn any error into a FORMAT message.
2204 FORMAT can have a %s escape which will be replaced with the actual error.
2205 If `debug-on-error' is set, errors are not caught, so that you can
2206 debug them.
2207 Avoid using a large BODY since it is duplicated."
2208 (declare (debug t) (indent 1))
2209 `(if debug-on-error
2210 (progn . ,body)
2211 (condition-case err
2212 (progn . ,body)
2213 (error (message ,format (prin1-to-string err))))))
2215 (defun normal-mode (&optional find-file)
2216 "Choose the major mode for this buffer automatically.
2217 Also sets up any specified local variables of the file.
2218 Uses the visited file name, the -*- line, and the local variables spec.
2220 This function is called automatically from `find-file'. In that case,
2221 we may set up the file-specified mode and local variables,
2222 depending on the value of `enable-local-variables'.
2223 In addition, if `local-enable-local-variables' is nil, we do
2224 not set local variables (though we do notice a mode specified with -*-.)
2226 `enable-local-variables' is ignored if you run `normal-mode' interactively,
2227 or from Lisp without specifying the optional argument FIND-FILE;
2228 in that case, this function acts as if `enable-local-variables' were t."
2229 (interactive)
2230 (fundamental-mode)
2231 (let ((enable-local-variables (or (not find-file) enable-local-variables)))
2232 ;; FIXME this is less efficient than it could be, since both
2233 ;; s-a-m and h-l-v may parse the same regions, looking for "mode:".
2234 (report-errors "File mode specification error: %s"
2235 (set-auto-mode))
2236 (report-errors "File local-variables error: %s"
2237 (hack-local-variables)))
2238 ;; Turn font lock off and on, to make sure it takes account of
2239 ;; whatever file local variables are relevant to it.
2240 (when (and font-lock-mode
2241 ;; Font-lock-mode (now in font-core.el) can be ON when
2242 ;; font-lock.el still hasn't been loaded.
2243 (boundp 'font-lock-keywords)
2244 (eq (car font-lock-keywords) t))
2245 (setq font-lock-keywords (cadr font-lock-keywords))
2246 (font-lock-mode 1)))
2248 (defcustom auto-mode-case-fold t
2249 "Non-nil means to try second pass through `auto-mode-alist'.
2250 This means that if the first case-sensitive search through the alist fails
2251 to find a matching major mode, a second case-insensitive search is made.
2252 On systems with case-insensitive file names, this variable is ignored,
2253 since only a single case-insensitive search through the alist is made."
2254 :group 'files
2255 :version "22.1"
2256 :type 'boolean)
2258 (defvar auto-mode-alist
2259 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
2260 ;; c++-mode, java-mode and more) are added through autoload
2261 ;; directives in that file. That way is discouraged since it
2262 ;; spreads out the definition of the initial value.
2263 (mapcar
2264 (lambda (elt)
2265 (cons (purecopy (car elt)) (cdr elt)))
2266 `(;; do this first, so that .html.pl is Polish html, not Perl
2267 ("\\.[sx]?html?\\(\\.[a-zA-Z_]+\\)?\\'" . html-mode)
2268 ("\\.svgz?\\'" . image-mode)
2269 ("\\.svgz?\\'" . xml-mode)
2270 ("\\.x[bp]m\\'" . image-mode)
2271 ("\\.x[bp]m\\'" . c-mode)
2272 ("\\.p[bpgn]m\\'" . image-mode)
2273 ("\\.tiff?\\'" . image-mode)
2274 ("\\.gif\\'" . image-mode)
2275 ("\\.png\\'" . image-mode)
2276 ("\\.jpe?g\\'" . image-mode)
2277 ("\\.te?xt\\'" . text-mode)
2278 ("\\.[tT]e[xX]\\'" . tex-mode)
2279 ("\\.ins\\'" . tex-mode) ;Installation files for TeX packages.
2280 ("\\.ltx\\'" . latex-mode)
2281 ("\\.dtx\\'" . doctex-mode)
2282 ("\\.org\\'" . org-mode)
2283 ("\\.el\\'" . emacs-lisp-mode)
2284 ("Project\\.ede\\'" . emacs-lisp-mode)
2285 ("\\.\\(scm\\|stk\\|ss\\|sch\\)\\'" . scheme-mode)
2286 ("\\.l\\'" . lisp-mode)
2287 ("\\.li?sp\\'" . lisp-mode)
2288 ("\\.[fF]\\'" . fortran-mode)
2289 ("\\.for\\'" . fortran-mode)
2290 ("\\.p\\'" . pascal-mode)
2291 ("\\.pas\\'" . pascal-mode)
2292 ("\\.\\(dpr\\|DPR\\)\\'" . delphi-mode)
2293 ("\\.ad[abs]\\'" . ada-mode)
2294 ("\\.ad[bs].dg\\'" . ada-mode)
2295 ("\\.\\([pP]\\([Llm]\\|erl\\|od\\)\\|al\\)\\'" . perl-mode)
2296 ("Imakefile\\'" . makefile-imake-mode)
2297 ("Makeppfile\\(?:\\.mk\\)?\\'" . makefile-makepp-mode) ; Put this before .mk
2298 ("\\.makepp\\'" . makefile-makepp-mode)
2299 ,@(if (memq system-type '(berkeley-unix darwin))
2300 '(("\\.mk\\'" . makefile-bsdmake-mode)
2301 ("\\.make\\'" . makefile-bsdmake-mode)
2302 ("GNUmakefile\\'" . makefile-gmake-mode)
2303 ("[Mm]akefile\\'" . makefile-bsdmake-mode))
2304 '(("\\.mk\\'" . makefile-gmake-mode) ; Might be any make, give Gnu the host advantage
2305 ("\\.make\\'" . makefile-gmake-mode)
2306 ("[Mm]akefile\\'" . makefile-gmake-mode)))
2307 ("\\.am\\'" . makefile-automake-mode)
2308 ;; Less common extensions come here
2309 ;; so more common ones above are found faster.
2310 ("\\.texinfo\\'" . texinfo-mode)
2311 ("\\.te?xi\\'" . texinfo-mode)
2312 ("\\.[sS]\\'" . asm-mode)
2313 ("\\.asm\\'" . asm-mode)
2314 ("\\.css\\'" . css-mode)
2315 ("\\.mixal\\'" . mixal-mode)
2316 ("\\.gcov\\'" . compilation-mode)
2317 ;; Besides .gdbinit, gdb documents other names to be usable for init
2318 ;; files, cross-debuggers can use something like
2319 ;; .PROCESSORNAME-gdbinit so that the host and target gdbinit files
2320 ;; don't interfere with each other.
2321 ("/\\.[a-z0-9-]*gdbinit" . gdb-script-mode)
2322 ;; GDB 7.5 introduced OBJFILE-gdb.gdb script files; e.g. a file
2323 ;; named 'emacs-gdb.gdb', if it exists, will be automatically
2324 ;; loaded when GDB reads an objfile called 'emacs'.
2325 ("-gdb\\.gdb" . gdb-script-mode)
2326 ("[cC]hange\\.?[lL]og?\\'" . change-log-mode)
2327 ("[cC]hange[lL]og[-.][0-9]+\\'" . change-log-mode)
2328 ("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode)
2329 ("\\.scm\\.[0-9]*\\'" . scheme-mode)
2330 ("\\.[ck]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode)
2331 ("\\.bash\\'" . sh-mode)
2332 ("\\(/\\|\\`\\)\\.\\(bash_\\(profile\\|history\\|log\\(in\\|out\\)\\)\\|z?log\\(in\\|out\\)\\)\\'" . sh-mode)
2333 ("\\(/\\|\\`\\)\\.\\(shrc\\|[kz]shrc\\|bashrc\\|t?cshrc\\|esrc\\)\\'" . sh-mode)
2334 ("\\(/\\|\\`\\)\\.\\([kz]shenv\\|xinitrc\\|startxrc\\|xsession\\)\\'" . sh-mode)
2335 ("\\.m?spec\\'" . sh-mode)
2336 ("\\.m[mes]\\'" . nroff-mode)
2337 ("\\.man\\'" . nroff-mode)
2338 ("\\.sty\\'" . latex-mode)
2339 ("\\.cl[so]\\'" . latex-mode) ;LaTeX 2e class option
2340 ("\\.bbl\\'" . latex-mode)
2341 ("\\.bib\\'" . bibtex-mode)
2342 ("\\.bst\\'" . bibtex-style-mode)
2343 ("\\.sql\\'" . sql-mode)
2344 ("\\.m[4c]\\'" . m4-mode)
2345 ("\\.mf\\'" . metafont-mode)
2346 ("\\.mp\\'" . metapost-mode)
2347 ("\\.vhdl?\\'" . vhdl-mode)
2348 ("\\.article\\'" . text-mode)
2349 ("\\.letter\\'" . text-mode)
2350 ("\\.i?tcl\\'" . tcl-mode)
2351 ("\\.exp\\'" . tcl-mode)
2352 ("\\.itk\\'" . tcl-mode)
2353 ("\\.icn\\'" . icon-mode)
2354 ("\\.sim\\'" . simula-mode)
2355 ("\\.mss\\'" . scribe-mode)
2356 ;; The Fortran standard does not say anything about file extensions.
2357 ;; .f90 was widely used for F90, now we seem to be trapped into
2358 ;; using a different extension for each language revision.
2359 ;; Anyway, the following extensions are supported by gfortran.
2360 ("\\.f9[05]\\'" . f90-mode)
2361 ("\\.f0[38]\\'" . f90-mode)
2362 ("\\.indent\\.pro\\'" . fundamental-mode) ; to avoid idlwave-mode
2363 ("\\.\\(pro\\|PRO\\)\\'" . idlwave-mode)
2364 ("\\.srt\\'" . srecode-template-mode)
2365 ("\\.prolog\\'" . prolog-mode)
2366 ("\\.tar\\'" . tar-mode)
2367 ;; The list of archive file extensions should be in sync with
2368 ;; `auto-coding-alist' with `no-conversion' coding system.
2369 ("\\.\\(\
2370 arc\\|zip\\|lzh\\|lha\\|zoo\\|[jew]ar\\|xpi\\|rar\\|7z\\|\
2371 ARC\\|ZIP\\|LZH\\|LHA\\|ZOO\\|[JEW]AR\\|XPI\\|RAR\\|7Z\\)\\'" . archive-mode)
2372 ("\\.oxt\\'" . archive-mode) ;(Open|Libre)Office extensions.
2373 ("\\.\\(deb\\|[oi]pk\\)\\'" . archive-mode) ; Debian/Opkg packages.
2374 ;; Mailer puts message to be edited in
2375 ;; /tmp/Re.... or Message
2376 ("\\`/tmp/Re" . text-mode)
2377 ("/Message[0-9]*\\'" . text-mode)
2378 ;; some news reader is reported to use this
2379 ("\\`/tmp/fol/" . text-mode)
2380 ("\\.oak\\'" . scheme-mode)
2381 ("\\.sgml?\\'" . sgml-mode)
2382 ("\\.x[ms]l\\'" . xml-mode)
2383 ("\\.dbk\\'" . xml-mode)
2384 ("\\.dtd\\'" . sgml-mode)
2385 ("\\.ds\\(ss\\)?l\\'" . dsssl-mode)
2386 ("\\.js\\'" . javascript-mode)
2387 ("\\.json\\'" . javascript-mode)
2388 ("\\.[ds]?vh?\\'" . verilog-mode)
2389 ("\\.by\\'" . bovine-grammar-mode)
2390 ("\\.wy\\'" . wisent-grammar-mode)
2391 ;; .emacs or .gnus or .viper following a directory delimiter in
2392 ;; Unix, MSDOG or VMS syntax.
2393 ("[]>:/\\]\\..*\\(emacs\\|gnus\\|viper\\)\\'" . emacs-lisp-mode)
2394 ("\\`\\..*emacs\\'" . emacs-lisp-mode)
2395 ;; _emacs following a directory delimiter
2396 ;; in MsDos syntax
2397 ("[:/]_emacs\\'" . emacs-lisp-mode)
2398 ("/crontab\\.X*[0-9]+\\'" . shell-script-mode)
2399 ("\\.ml\\'" . lisp-mode)
2400 ;; Linux-2.6.9 uses some different suffix for linker scripts:
2401 ;; "ld", "lds", "lds.S", "lds.in", "ld.script", and "ld.script.balo".
2402 ;; eCos uses "ld" and "ldi". Netbsd uses "ldscript.*".
2403 ("\\.ld[si]?\\'" . ld-script-mode)
2404 ("ld\\.?script\\'" . ld-script-mode)
2405 ;; .xs is also used for ld scripts, but seems to be more commonly
2406 ;; associated with Perl .xs files (C with Perl bindings). (Bug#7071)
2407 ("\\.xs\\'" . c-mode)
2408 ;; Explained in binutils ld/genscripts.sh. Eg:
2409 ;; A .x script file is the default script.
2410 ;; A .xr script is for linking without relocation (-r flag). Etc.
2411 ("\\.x[abdsru]?[cnw]?\\'" . ld-script-mode)
2412 ("\\.zone\\'" . dns-mode)
2413 ("\\.soa\\'" . dns-mode)
2414 ;; Common Lisp ASDF package system.
2415 ("\\.asd\\'" . lisp-mode)
2416 ("\\.\\(asn\\|mib\\|smi\\)\\'" . snmp-mode)
2417 ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode)
2418 ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode)
2419 ("\\.\\(dif\\|pat\\)\\'" . diff-mode) ; for MSDOG
2420 ("\\.[eE]?[pP][sS]\\'" . ps-mode)
2421 ("\\.\\(?:PDF\\|DVI\\|OD[FGPST]\\|DOCX?\\|XLSX?\\|PPTX?\\|pdf\\|djvu\\|dvi\\|od[fgpst]\\|docx?\\|xlsx?\\|pptx?\\)\\'" . doc-view-mode-maybe)
2422 ("configure\\.\\(ac\\|in\\)\\'" . autoconf-mode)
2423 ("\\.s\\(v\\|iv\\|ieve\\)\\'" . sieve-mode)
2424 ("BROWSE\\'" . ebrowse-tree-mode)
2425 ("\\.ebrowse\\'" . ebrowse-tree-mode)
2426 ("#\\*mail\\*" . mail-mode)
2427 ("\\.g\\'" . antlr-mode)
2428 ("\\.mod\\'" . m2-mode)
2429 ("\\.ses\\'" . ses-mode)
2430 ("\\.docbook\\'" . sgml-mode)
2431 ("\\.com\\'" . dcl-mode)
2432 ("/config\\.\\(?:bat\\|log\\)\\'" . fundamental-mode)
2433 ;; Windows candidates may be opened case sensitively on Unix
2434 ("\\.\\(?:[iI][nN][iI]\\|[lL][sS][tT]\\|[rR][eE][gG]\\|[sS][yY][sS]\\)\\'" . conf-mode)
2435 ("\\.\\(?:desktop\\|la\\)\\'" . conf-unix-mode)
2436 ("\\.ppd\\'" . conf-ppd-mode)
2437 ("java.+\\.conf\\'" . conf-javaprop-mode)
2438 ("\\.properties\\(?:\\.[a-zA-Z0-9._-]+\\)?\\'" . conf-javaprop-mode)
2439 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
2440 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
2441 ;; ChangeLog.old etc. Other change-log-mode entries are above;
2442 ;; this has lower priority to avoid matching changelog.sgml etc.
2443 ("[cC]hange[lL]og[-.][-0-9a-z]+\\'" . change-log-mode)
2444 ;; either user's dot-files or under /etc or some such
2445 ("/\\.?\\(?:gnokiirc\\|kde.*rc\\|mime\\.types\\|wgetrc\\)\\'" . conf-mode)
2446 ;; alas not all ~/.*rc files are like this
2447 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
2448 ("/\\.\\(?:gdbtkinit\\|grip\\|orbital/.+txt\\|rhosts\\|tuxracer/options\\)\\'" . conf-mode)
2449 ("/\\.?X\\(?:default\\|resource\\|re\\)s\\>" . conf-xdefaults-mode)
2450 ("/X11.+app-defaults/" . conf-xdefaults-mode)
2451 ("/X11.+locale/.+/Compose\\'" . conf-colon-mode)
2452 ;; this contains everything twice, with space and with colon :-(
2453 ("/X11.+locale/compose\\.dir\\'" . conf-javaprop-mode)
2454 ;; Get rid of any trailing .n.m and try again.
2455 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
2456 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
2457 ;; Using mode nil rather than `ignore' would let the search continue
2458 ;; through this list (with the shortened name) rather than start over.
2459 ("\\.~?[0-9]+\\.[0-9][-.0-9]*~?\\'" nil t)
2460 ("\\.\\(?:orig\\|in\\|[bB][aA][kK]\\)\\'" nil t)
2461 ;; This should come after "in" stripping (e.g. config.h.in).
2462 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
2463 ("[/.]c\\(?:on\\)?f\\(?:i?g\\)?\\(?:\\.[a-zA-Z0-9._-]+\\)?\\'" . conf-mode-maybe)
2464 ;; The following should come after the ChangeLog pattern
2465 ;; for the sake of ChangeLog.1, etc.
2466 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
2467 ("\\.[1-9]\\'" . nroff-mode)))
2468 "Alist of filename patterns vs corresponding major mode functions.
2469 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
2470 \(NON-NIL stands for anything that is not nil; the value does not matter.)
2471 Visiting a file whose name matches REGEXP specifies FUNCTION as the
2472 mode function to use. FUNCTION will be called, unless it is nil.
2474 If the element has the form (REGEXP FUNCTION NON-NIL), then after
2475 calling FUNCTION (if it's not nil), we delete the suffix that matched
2476 REGEXP and search the list again for another match.
2478 The extensions whose FUNCTION is `archive-mode' should also
2479 appear in `auto-coding-alist' with `no-conversion' coding system.
2481 See also `interpreter-mode-alist', which detects executable script modes
2482 based on the interpreters they specify to run,
2483 and `magic-mode-alist', which determines modes based on file contents.")
2484 (put 'auto-mode-alist 'risky-local-variable t)
2486 (defun conf-mode-maybe ()
2487 "Select Conf mode or XML mode according to start of file."
2488 (if (save-excursion
2489 (save-restriction
2490 (widen)
2491 (goto-char (point-min))
2492 (looking-at "<\\?xml \\|<!-- \\|<!DOCTYPE ")))
2493 (xml-mode)
2494 (conf-mode)))
2496 (defvar interpreter-mode-alist
2497 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
2498 ;; and pike-mode) are added through autoload directives in that
2499 ;; file. That way is discouraged since it spreads out the
2500 ;; definition of the initial value.
2501 (mapcar
2502 (lambda (l)
2503 (cons (purecopy (car l)) (cdr l)))
2504 '(("\\(mini\\)?perl5?" . perl-mode)
2505 ("wishx?" . tcl-mode)
2506 ("tcl\\(sh\\)?" . tcl-mode)
2507 ("expect" . tcl-mode)
2508 ("octave" . octave-mode)
2509 ("scm" . scheme-mode)
2510 ("[acjkwz]sh" . sh-mode)
2511 ("r?bash2?" . sh-mode)
2512 ("dash" . sh-mode)
2513 ("\\(dt\\|pd\\|w\\)ksh" . sh-mode)
2514 ("es" . sh-mode)
2515 ("i?tcsh" . sh-mode)
2516 ("oash" . sh-mode)
2517 ("rc" . sh-mode)
2518 ("rpm" . sh-mode)
2519 ("sh5?" . sh-mode)
2520 ("tail" . text-mode)
2521 ("more" . text-mode)
2522 ("less" . text-mode)
2523 ("pg" . text-mode)
2524 ("make" . makefile-gmake-mode) ; Debian uses this
2525 ("guile" . scheme-mode)
2526 ("clisp" . lisp-mode)
2527 ("emacs" . emacs-lisp-mode)))
2528 "Alist mapping interpreter names to major modes.
2529 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
2530 Each element looks like (REGEXP . MODE).
2531 If \\\\`REGEXP\\\\' matches the name (minus any directory part) of
2532 the interpreter specified in the first line of a script, enable
2533 major mode MODE.
2535 See also `auto-mode-alist'.")
2537 (define-obsolete-variable-alias 'inhibit-first-line-modes-regexps
2538 'inhibit-file-local-variables-regexps "24.1")
2540 ;; TODO really this should be a list of modes (eg tar-mode), not regexps,
2541 ;; because we are duplicating info from auto-mode-alist.
2542 ;; TODO many elements of this list are also in auto-coding-alist.
2543 (defvar inhibit-local-variables-regexps
2544 (mapcar 'purecopy '("\\.tar\\'" "\\.t[bg]z\\'"
2545 "\\.arc\\'" "\\.zip\\'" "\\.lzh\\'" "\\.lha\\'"
2546 "\\.zoo\\'" "\\.[jew]ar\\'" "\\.xpi\\'" "\\.rar\\'"
2547 "\\.7z\\'"
2548 "\\.sx[dmicw]\\'" "\\.odt\\'"
2549 "\\.diff\\'" "\\.patch\\'"
2550 "\\.tiff?\\'" "\\.gif\\'" "\\.png\\'" "\\.jpe?g\\'"))
2551 "List of regexps matching file names in which to ignore local variables.
2552 This includes `-*-' lines as well as trailing \"Local Variables\" sections.
2553 Files matching this list are typically binary file formats.
2554 They may happen to contain sequences that look like local variable
2555 specifications, but are not really, or they may be containers for
2556 member files with their own local variable sections, which are
2557 not appropriate for the containing file.
2558 The function `inhibit-local-variables-p' uses this.")
2560 (define-obsolete-variable-alias 'inhibit-first-line-modes-suffixes
2561 'inhibit-local-variables-suffixes "24.1")
2563 (defvar inhibit-local-variables-suffixes nil
2564 "List of regexps matching suffixes to remove from file names.
2565 The function `inhibit-local-variables-p' uses this: when checking
2566 a file name, it first discards from the end of the name anything that
2567 matches one of these regexps.")
2569 ;; Can't think of any situation in which you'd want this to be nil...
2570 (defvar inhibit-local-variables-ignore-case t
2571 "Non-nil means `inhibit-local-variables-p' ignores case.")
2573 (defun inhibit-local-variables-p ()
2574 "Return non-nil if file local variables should be ignored.
2575 This checks the file (or buffer) name against `inhibit-local-variables-regexps'
2576 and `inhibit-local-variables-suffixes'. If
2577 `inhibit-local-variables-ignore-case' is non-nil, this ignores case."
2578 (let ((temp inhibit-local-variables-regexps)
2579 (name (if buffer-file-name
2580 (file-name-sans-versions buffer-file-name)
2581 (buffer-name)))
2582 (case-fold-search inhibit-local-variables-ignore-case))
2583 (while (let ((sufs inhibit-local-variables-suffixes))
2584 (while (and sufs (not (string-match (car sufs) name)))
2585 (setq sufs (cdr sufs)))
2586 sufs)
2587 (setq name (substring name 0 (match-beginning 0))))
2588 (while (and temp
2589 (not (string-match (car temp) name)))
2590 (setq temp (cdr temp)))
2591 temp))
2593 (defvar auto-mode-interpreter-regexp
2594 (purecopy "#![ \t]?\\([^ \t\n]*\
2595 /bin/env[ \t]\\)?\\([^ \t\n]+\\)")
2596 "Regexp matching interpreters, for file mode determination.
2597 This regular expression is matched against the first line of a file
2598 to determine the file's mode in `set-auto-mode'. If it matches, the file
2599 is assumed to be interpreted by the interpreter matched by the second group
2600 of the regular expression. The mode is then determined as the mode
2601 associated with that interpreter in `interpreter-mode-alist'.")
2603 (defvar magic-mode-alist nil
2604 "Alist of buffer beginnings vs. corresponding major mode functions.
2605 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2606 After visiting a file, if REGEXP matches the text at the beginning of the
2607 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2608 call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
2609 major mode.
2611 If FUNCTION is nil, then it is not called. (That is a way of saying
2612 \"allow `auto-mode-alist' to decide for these files.\")")
2613 (put 'magic-mode-alist 'risky-local-variable t)
2615 (defvar magic-fallback-mode-alist
2616 (purecopy
2617 `((image-type-auto-detected-p . image-mode)
2618 ("\\(PK00\\)?[P]K\003\004" . archive-mode) ; zip
2619 ;; The < comes before the groups (but the first) to reduce backtracking.
2620 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
2621 ;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
2622 (,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
2623 (comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
2624 (concat "\\(?:<\\?xml[ \t\r\n]+[^>]*>\\)?[ \t\r\n]*<"
2625 comment-re "*"
2626 "\\(?:!DOCTYPE[ \t\r\n]+[^>]*>[ \t\r\n]*<[ \t\r\n]*" comment-re "*\\)?"
2627 "[Hh][Tt][Mm][Ll]"))
2628 . html-mode)
2629 ("<!DOCTYPE[ \t\r\n]+[Hh][Tt][Mm][Ll]" . html-mode)
2630 ;; These two must come after html, because they are more general:
2631 ("<\\?xml " . xml-mode)
2632 (,(let* ((incomment-re "\\(?:[^-]\\|-[^-]\\)")
2633 (comment-re (concat "\\(?:!--" incomment-re "*-->[ \t\r\n]*<\\)")))
2634 (concat "[ \t\r\n]*<" comment-re "*!DOCTYPE "))
2635 . sgml-mode)
2636 ("%!PS" . ps-mode)
2637 ("# xmcd " . conf-unix-mode)))
2638 "Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
2639 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2640 After visiting a file, if REGEXP matches the text at the beginning of the
2641 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2642 call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
2643 have not specified a mode for this file.
2645 If FUNCTION is nil, then it is not called.")
2646 (put 'magic-fallback-mode-alist 'risky-local-variable t)
2648 (defvar magic-mode-regexp-match-limit 4000
2649 "Upper limit on `magic-mode-alist' regexp matches.
2650 Also applies to `magic-fallback-mode-alist'.")
2652 (defun set-auto-mode (&optional keep-mode-if-same)
2653 "Select major mode appropriate for current buffer.
2655 To find the right major mode, this function checks for a -*- mode tag
2656 checks for a `mode:' entry in the Local Variables section of the file,
2657 checks if it uses an interpreter listed in `interpreter-mode-alist',
2658 matches the buffer beginning against `magic-mode-alist',
2659 compares the filename against the entries in `auto-mode-alist',
2660 then matches the buffer beginning against `magic-fallback-mode-alist'.
2662 If `enable-local-variables' is nil, or if the file name matches
2663 `inhibit-local-variables-regexps', this function does not check
2664 for any mode: tag anywhere in the file. If `local-enable-local-variables'
2665 is nil, then the only mode: tag that can be relevant is a -*- one.
2667 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2668 set the major mode only if that would change it. In other words
2669 we don't actually set it to the same mode the buffer already has."
2670 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2671 (let ((try-locals (not (inhibit-local-variables-p)))
2672 end done mode modes)
2673 ;; Once we drop the deprecated feature where mode: is also allowed to
2674 ;; specify minor-modes (ie, there can be more than one "mode:"), we can
2675 ;; remove this section and just let (hack-local-variables t) handle it.
2676 ;; Find a -*- mode tag.
2677 (save-excursion
2678 (goto-char (point-min))
2679 (skip-chars-forward " \t\n")
2680 ;; Note by design local-enable-local-variables does not matter here.
2681 (and enable-local-variables
2682 try-locals
2683 (setq end (set-auto-mode-1))
2684 (if (save-excursion (search-forward ":" end t))
2685 ;; Find all specifications for the `mode:' variable
2686 ;; and execute them left to right.
2687 (while (let ((case-fold-search t))
2688 (or (and (looking-at "mode:")
2689 (goto-char (match-end 0)))
2690 (re-search-forward "[ \t;]mode:" end t)))
2691 (skip-chars-forward " \t")
2692 (let ((beg (point)))
2693 (if (search-forward ";" end t)
2694 (forward-char -1)
2695 (goto-char end))
2696 (skip-chars-backward " \t")
2697 (push (intern (concat (downcase (buffer-substring beg (point))) "-mode"))
2698 modes)))
2699 ;; Simple -*-MODE-*- case.
2700 (push (intern (concat (downcase (buffer-substring (point) end))
2701 "-mode"))
2702 modes))))
2703 ;; If we found modes to use, invoke them now, outside the save-excursion.
2704 (if modes
2705 (catch 'nop
2706 (dolist (mode (nreverse modes))
2707 (if (not (functionp mode))
2708 (message "Ignoring unknown mode `%s'" mode)
2709 (setq done t)
2710 (or (set-auto-mode-0 mode keep-mode-if-same)
2711 ;; continuing would call minor modes again, toggling them off
2712 (throw 'nop nil))))))
2713 ;; hack-local-variables checks local-enable-local-variables etc, but
2714 ;; we might as well be explicit here for the sake of clarity.
2715 (and (not done)
2716 enable-local-variables
2717 local-enable-local-variables
2718 try-locals
2719 (setq mode (hack-local-variables t))
2720 (not (memq mode modes)) ; already tried and failed
2721 (if (not (functionp mode))
2722 (message "Ignoring unknown mode `%s'" mode)
2723 (setq done t)
2724 (set-auto-mode-0 mode keep-mode-if-same)))
2725 ;; If we didn't, look for an interpreter specified in the first line.
2726 ;; As a special case, allow for things like "#!/bin/env perl", which
2727 ;; finds the interpreter anywhere in $PATH.
2728 (and (not done)
2729 (setq mode (save-excursion
2730 (goto-char (point-min))
2731 (if (looking-at auto-mode-interpreter-regexp)
2732 (match-string 2))))
2733 ;; Map interpreter name to a mode, signaling we're done at the
2734 ;; same time.
2735 (setq done (assoc-default
2736 (file-name-nondirectory mode)
2737 (mapcar (lambda (e)
2738 (cons
2739 (format "\\`%s\\'" (car e))
2740 (cdr e)))
2741 interpreter-mode-alist)
2742 #'string-match-p))
2743 ;; If we found an interpreter mode to use, invoke it now.
2744 (set-auto-mode-0 done keep-mode-if-same))
2745 ;; Next try matching the buffer beginning against magic-mode-alist.
2746 (unless done
2747 (if (setq done (save-excursion
2748 (goto-char (point-min))
2749 (save-restriction
2750 (narrow-to-region (point-min)
2751 (min (point-max)
2752 (+ (point-min) magic-mode-regexp-match-limit)))
2753 (assoc-default nil magic-mode-alist
2754 (lambda (re _dummy)
2755 (if (functionp re)
2756 (funcall re)
2757 (looking-at re)))))))
2758 (set-auto-mode-0 done keep-mode-if-same)))
2759 ;; Next compare the filename against the entries in auto-mode-alist.
2760 (unless done
2761 (if buffer-file-name
2762 (let ((name buffer-file-name)
2763 (remote-id (file-remote-p buffer-file-name)))
2764 ;; Remove backup-suffixes from file name.
2765 (setq name (file-name-sans-versions name))
2766 ;; Remove remote file name identification.
2767 (when (and (stringp remote-id)
2768 (string-match (regexp-quote remote-id) name))
2769 (setq name (substring name (match-end 0))))
2770 (while name
2771 ;; Find first matching alist entry.
2772 (setq mode
2773 (if (memq system-type '(windows-nt cygwin))
2774 ;; System is case-insensitive.
2775 (let ((case-fold-search t))
2776 (assoc-default name auto-mode-alist
2777 'string-match))
2778 ;; System is case-sensitive.
2780 ;; First match case-sensitively.
2781 (let ((case-fold-search nil))
2782 (assoc-default name auto-mode-alist
2783 'string-match))
2784 ;; Fallback to case-insensitive match.
2785 (and auto-mode-case-fold
2786 (let ((case-fold-search t))
2787 (assoc-default name auto-mode-alist
2788 'string-match))))))
2789 (if (and mode
2790 (consp mode)
2791 (cadr mode))
2792 (setq mode (car mode)
2793 name (substring name 0 (match-beginning 0)))
2794 (setq name nil))
2795 (when mode
2796 (set-auto-mode-0 mode keep-mode-if-same)
2797 (setq done t))))))
2798 ;; Next try matching the buffer beginning against magic-fallback-mode-alist.
2799 (unless done
2800 (if (setq done (save-excursion
2801 (goto-char (point-min))
2802 (save-restriction
2803 (narrow-to-region (point-min)
2804 (min (point-max)
2805 (+ (point-min) magic-mode-regexp-match-limit)))
2806 (assoc-default nil magic-fallback-mode-alist
2807 (lambda (re _dummy)
2808 (if (functionp re)
2809 (funcall re)
2810 (looking-at re)))))))
2811 (set-auto-mode-0 done keep-mode-if-same)))
2812 (unless done
2813 (set-buffer-major-mode (current-buffer)))))
2815 ;; When `keep-mode-if-same' is set, we are working on behalf of
2816 ;; set-visited-file-name. In that case, if the major mode specified is the
2817 ;; same one we already have, don't actually reset it. We don't want to lose
2818 ;; minor modes such as Font Lock.
2819 (defun set-auto-mode-0 (mode &optional keep-mode-if-same)
2820 "Apply MODE and return it.
2821 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2822 any aliases and compared to current major mode. If they are the
2823 same, do nothing and return nil."
2824 (unless (and keep-mode-if-same
2825 (eq (indirect-function mode)
2826 (indirect-function major-mode)))
2827 (when mode
2828 (funcall mode)
2829 mode)))
2831 (defvar file-auto-mode-skip "^\\(#!\\|'\\\\\"\\)"
2832 "Regexp of lines to skip when looking for file-local settings.
2833 If the first line matches this regular expression, then the -*-...-*- file-
2834 local settings will be consulted on the second line instead of the first.")
2836 (defun set-auto-mode-1 ()
2837 "Find the -*- spec in the buffer.
2838 Call with point at the place to start searching from.
2839 If one is found, set point to the beginning and return the position
2840 of the end. Otherwise, return nil; may change point.
2841 The variable `inhibit-local-variables-regexps' can cause a -*- spec to
2842 be ignored; but `enable-local-variables' and `local-enable-local-variables'
2843 have no effect."
2844 (let (beg end)
2845 (and
2846 ;; Don't look for -*- if this file name matches any
2847 ;; of the regexps in inhibit-local-variables-regexps.
2848 (not (inhibit-local-variables-p))
2849 (search-forward "-*-" (line-end-position
2850 ;; If the file begins with "#!" (exec
2851 ;; interpreter magic), look for mode frobs
2852 ;; in the first two lines. You cannot
2853 ;; necessarily put them in the first line
2854 ;; of such a file without screwing up the
2855 ;; interpreter invocation. The same holds
2856 ;; for '\" in man pages (preprocessor
2857 ;; magic for the `man' program).
2858 (and (looking-at file-auto-mode-skip) 2)) t)
2859 (progn
2860 (skip-chars-forward " \t")
2861 (setq beg (point))
2862 (search-forward "-*-" (line-end-position) t))
2863 (progn
2864 (forward-char -3)
2865 (skip-chars-backward " \t")
2866 (setq end (point))
2867 (goto-char beg)
2868 end))))
2870 ;;; Handling file local variables
2872 (defvar ignored-local-variables
2873 '(ignored-local-variables safe-local-variable-values
2874 file-local-variables-alist dir-local-variables-alist)
2875 "Variables to be ignored in a file's local variable spec.")
2876 (put 'ignored-local-variables 'risky-local-variable t)
2878 (defvar hack-local-variables-hook nil
2879 "Normal hook run after processing a file's local variables specs.
2880 Major modes can use this to examine user-specified local variables
2881 in order to initialize other data structure based on them.")
2883 (defcustom safe-local-variable-values nil
2884 "List variable-value pairs that are considered safe.
2885 Each element is a cons cell (VAR . VAL), where VAR is a variable
2886 symbol and VAL is a value that is considered safe."
2887 :risky t
2888 :group 'find-file
2889 :type 'alist)
2891 (defcustom safe-local-eval-forms
2892 ;; This should be here at least as long as Emacs supports write-file-hooks.
2893 '((add-hook 'write-file-hooks 'time-stamp)
2894 (add-hook 'write-file-functions 'time-stamp)
2895 (add-hook 'before-save-hook 'time-stamp nil t)
2896 (add-hook 'before-save-hook 'delete-trailing-whitespace nil t))
2897 "Expressions that are considered safe in an `eval:' local variable.
2898 Add expressions to this list if you want Emacs to evaluate them, when
2899 they appear in an `eval' local variable specification, without first
2900 asking you for confirmation."
2901 :risky t
2902 :group 'find-file
2903 :version "24.1" ; added write-file-hooks
2904 :type '(repeat sexp))
2906 ;; Risky local variables:
2907 (mapc (lambda (var) (put var 'risky-local-variable t))
2908 '(after-load-alist
2909 buffer-auto-save-file-name
2910 buffer-file-name
2911 buffer-file-truename
2912 buffer-undo-list
2913 debugger
2914 default-text-properties
2915 eval
2916 exec-directory
2917 exec-path
2918 file-name-handler-alist
2919 frame-title-format
2920 global-mode-string
2921 header-line-format
2922 icon-title-format
2923 inhibit-quit
2924 load-path
2925 max-lisp-eval-depth
2926 max-specpdl-size
2927 minor-mode-map-alist
2928 minor-mode-overriding-map-alist
2929 mode-line-format
2930 mode-name
2931 overriding-local-map
2932 overriding-terminal-local-map
2933 process-environment
2934 standard-input
2935 standard-output
2936 unread-command-events))
2938 ;; Safe local variables:
2940 ;; For variables defined by major modes, the safety declarations can go into
2941 ;; the major mode's file, since that will be loaded before file variables are
2942 ;; processed.
2944 ;; For variables defined by minor modes, put the safety declarations in the
2945 ;; file defining the minor mode after the defcustom/defvar using an autoload
2946 ;; cookie, e.g.:
2948 ;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
2950 ;; Otherwise, when Emacs visits a file specifying that local variable, the
2951 ;; minor mode file may not be loaded yet.
2953 ;; For variables defined in the C source code the declaration should go here:
2955 (dolist (pair
2956 '((buffer-read-only . booleanp) ;; C source code
2957 (default-directory . stringp) ;; C source code
2958 (fill-column . integerp) ;; C source code
2959 (indent-tabs-mode . booleanp) ;; C source code
2960 (left-margin . integerp) ;; C source code
2961 (no-update-autoloads . booleanp)
2962 (lexical-binding . booleanp) ;; C source code
2963 (tab-width . integerp) ;; C source code
2964 (truncate-lines . booleanp) ;; C source code
2965 (word-wrap . booleanp) ;; C source code
2966 (bidi-display-reordering . booleanp))) ;; C source code
2967 (put (car pair) 'safe-local-variable (cdr pair)))
2969 (put 'bidi-paragraph-direction 'safe-local-variable
2970 (lambda (v) (memq v '(nil right-to-left left-to-right))))
2972 (put 'c-set-style 'safe-local-eval-function t)
2974 (defvar file-local-variables-alist nil
2975 "Alist of file-local variable settings in the current buffer.
2976 Each element in this list has the form (VAR . VALUE), where VAR
2977 is a file-local variable (a symbol) and VALUE is the value
2978 specified. The actual value in the buffer may differ from VALUE,
2979 if it is changed by the major or minor modes, or by the user.")
2980 (make-variable-buffer-local 'file-local-variables-alist)
2981 (put 'file-local-variables-alist 'permanent-local t)
2983 (defvar dir-local-variables-alist nil
2984 "Alist of directory-local variable settings in the current buffer.
2985 Each element in this list has the form (VAR . VALUE), where VAR
2986 is a directory-local variable (a symbol) and VALUE is the value
2987 specified in .dir-locals.el. The actual value in the buffer
2988 may differ from VALUE, if it is changed by the major or minor modes,
2989 or by the user.")
2990 (make-variable-buffer-local 'dir-local-variables-alist)
2992 (defvar before-hack-local-variables-hook nil
2993 "Normal hook run before setting file-local variables.
2994 It is called after checking for unsafe/risky variables and
2995 setting `file-local-variables-alist', and before applying the
2996 variables stored in `file-local-variables-alist'. A hook
2997 function is allowed to change the contents of this alist.
2999 This hook is called only if there is at least one file-local
3000 variable to set.")
3002 (defun hack-local-variables-confirm (all-vars unsafe-vars risky-vars dir-name)
3003 "Get confirmation before setting up local variable values.
3004 ALL-VARS is the list of all variables to be set up.
3005 UNSAFE-VARS is the list of those that aren't marked as safe or risky.
3006 RISKY-VARS is the list of those that are marked as risky.
3007 If these settings come from directory-local variables, then
3008 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3009 (unless noninteractive
3010 (let ((name (cond (dir-name)
3011 (buffer-file-name
3012 (file-name-nondirectory buffer-file-name))
3013 ((concat "buffer " (buffer-name)))))
3014 (offer-save (and (eq enable-local-variables t)
3015 unsafe-vars))
3016 (buf (get-buffer-create "*Local Variables*")))
3017 ;; Set up the contents of the *Local Variables* buffer.
3018 (with-current-buffer buf
3019 (erase-buffer)
3020 (cond
3021 (unsafe-vars
3022 (insert "The local variables list in " name
3023 "\ncontains values that may not be safe (*)"
3024 (if risky-vars
3025 ", and variables that are risky (**)."
3026 ".")))
3027 (risky-vars
3028 (insert "The local variables list in " name
3029 "\ncontains variables that are risky (**)."))
3031 (insert "A local variables list is specified in " name ".")))
3032 (insert "\n\nDo you want to apply it? You can type
3033 y -- to apply the local variables list.
3034 n -- to ignore the local variables list.")
3035 (if offer-save
3036 (insert "
3037 ! -- to apply the local variables list, and permanently mark these
3038 values (*) as safe (in the future, they will be set automatically.)\n\n")
3039 (insert "\n\n"))
3040 (dolist (elt all-vars)
3041 (cond ((member elt unsafe-vars)
3042 (insert " * "))
3043 ((member elt risky-vars)
3044 (insert " ** "))
3046 (insert " ")))
3047 (princ (car elt) buf)
3048 (insert " : ")
3049 ;; Make strings with embedded whitespace easier to read.
3050 (let ((print-escape-newlines t))
3051 (prin1 (cdr elt) buf))
3052 (insert "\n"))
3053 (set (make-local-variable 'cursor-type) nil)
3054 (set-buffer-modified-p nil)
3055 (goto-char (point-min)))
3057 ;; Display the buffer and read a choice.
3058 (save-window-excursion
3059 (pop-to-buffer buf)
3060 (let* ((exit-chars '(?y ?n ?\s ?\C-g ?\C-v))
3061 (prompt (format "Please type %s%s: "
3062 (if offer-save "y, n, or !" "y or n")
3063 (if (< (line-number-at-pos (point-max))
3064 (window-body-height))
3066 (push ?\C-v exit-chars)
3067 ", or C-v to scroll")))
3068 char)
3069 (if offer-save (push ?! exit-chars))
3070 (while (null char)
3071 (setq char (read-char-choice prompt exit-chars t))
3072 (when (eq char ?\C-v)
3073 (condition-case nil
3074 (scroll-up)
3075 (error (goto-char (point-min))
3076 (recenter 1)))
3077 (setq char nil)))
3078 (when (and offer-save (= char ?!) unsafe-vars)
3079 (customize-push-and-save 'safe-local-variable-values unsafe-vars))
3080 (prog1 (memq char '(?! ?\s ?y))
3081 (quit-window t)))))))
3083 (defconst hack-local-variable-regexp
3084 "[ \t]*\\([^][;\"'?()\\ \t\n]+\\)[ \t]*:[ \t]*")
3086 (defun hack-local-variables-prop-line (&optional mode-only)
3087 "Return local variables specified in the -*- line.
3088 Returns an alist of elements (VAR . VAL), where VAR is a variable
3089 and VAL is the specified value. Ignores any specification for
3090 `mode:' and `coding:' (which should have already been handled
3091 by `set-auto-mode' and `set-auto-coding', respectively).
3092 Return nil if the -*- line is malformed.
3094 If MODE-ONLY is non-nil, just returns the symbol specifying the
3095 mode, if there is one, otherwise nil."
3096 (catch 'malformed-line
3097 (save-excursion
3098 (goto-char (point-min))
3099 (let ((end (set-auto-mode-1))
3100 result)
3101 (cond ((not end)
3102 nil)
3103 ((looking-at "[ \t]*\\([^ \t\n\r:;]+\\)\\([ \t]*-\\*-\\)")
3104 ;; Simple form: "-*- MODENAME -*-".
3105 (if mode-only
3106 (intern (concat (match-string 1) "-mode"))))
3108 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
3109 ;; (last ";" is optional).
3110 ;; If MODE-ONLY, just check for `mode'.
3111 ;; Otherwise, parse the -*- line into the RESULT alist.
3112 (while (not (or (and mode-only result)
3113 (>= (point) end)))
3114 (unless (looking-at hack-local-variable-regexp)
3115 (message "Malformed mode-line: %S"
3116 (buffer-substring-no-properties (point) end))
3117 (throw 'malformed-line nil))
3118 (goto-char (match-end 0))
3119 ;; There used to be a downcase here,
3120 ;; but the manual didn't say so,
3121 ;; and people want to set var names that aren't all lc.
3122 (let* ((key (intern (match-string 1)))
3123 (val (save-restriction
3124 (narrow-to-region (point) end)
3125 (let ((read-circle nil))
3126 (read (current-buffer)))))
3127 ;; It is traditional to ignore
3128 ;; case when checking for `mode' in set-auto-mode,
3129 ;; so we must do that here as well.
3130 ;; That is inconsistent, but we're stuck with it.
3131 ;; The same can be said for `coding' in set-auto-coding.
3132 (keyname (downcase (symbol-name key))))
3133 (if mode-only
3134 (and (equal keyname "mode")
3135 (setq result
3136 (intern (concat (downcase (symbol-name val))
3137 "-mode"))))
3138 (or (equal keyname "coding")
3139 (condition-case nil
3140 (push (cons (cond ((eq key 'eval) 'eval)
3141 ;; Downcase "Mode:".
3142 ((equal keyname "mode") 'mode)
3143 (t (indirect-variable key)))
3144 val) result)
3145 (error nil))))
3146 (skip-chars-forward " \t;")))
3147 result))))))
3149 (defun hack-local-variables-filter (variables dir-name)
3150 "Filter local variable settings, querying the user if necessary.
3151 VARIABLES is the alist of variable-value settings. This alist is
3152 filtered based on the values of `ignored-local-variables',
3153 `enable-local-eval', `enable-local-variables', and (if necessary)
3154 user interaction. The results are added to
3155 `file-local-variables-alist', without applying them.
3156 If these settings come from directory-local variables, then
3157 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3158 ;; Find those variables that we may want to save to
3159 ;; `safe-local-variable-values'.
3160 (let (all-vars risky-vars unsafe-vars)
3161 (dolist (elt variables)
3162 (let ((var (car elt))
3163 (val (cdr elt)))
3164 (cond ((memq var ignored-local-variables)
3165 ;; Ignore any variable in `ignored-local-variables'.
3166 nil)
3167 ;; Obey `enable-local-eval'.
3168 ((eq var 'eval)
3169 (when enable-local-eval
3170 (let ((safe (or (hack-one-local-variable-eval-safep val)
3171 ;; In case previously marked safe (bug#5636).
3172 (safe-local-variable-p var val))))
3173 ;; If not safe and e-l-v = :safe, ignore totally.
3174 (when (or safe (not (eq enable-local-variables :safe)))
3175 (push elt all-vars)
3176 (or (eq enable-local-eval t)
3177 safe
3178 (push elt unsafe-vars))))))
3179 ;; Ignore duplicates (except `mode') in the present list.
3180 ((and (assq var all-vars) (not (eq var 'mode))) nil)
3181 ;; Accept known-safe variables.
3182 ((or (memq var '(mode unibyte coding))
3183 (safe-local-variable-p var val))
3184 (push elt all-vars))
3185 ;; The variable is either risky or unsafe:
3186 ((not (eq enable-local-variables :safe))
3187 (push elt all-vars)
3188 (if (risky-local-variable-p var val)
3189 (push elt risky-vars)
3190 (push elt unsafe-vars))))))
3191 (and all-vars
3192 ;; Query, unless all vars are safe or user wants no querying.
3193 (or (and (eq enable-local-variables t)
3194 (null unsafe-vars)
3195 (null risky-vars))
3196 (memq enable-local-variables '(:all :safe))
3197 (hack-local-variables-confirm all-vars unsafe-vars
3198 risky-vars dir-name))
3199 (dolist (elt all-vars)
3200 (unless (memq (car elt) '(eval mode))
3201 (unless dir-name
3202 (setq dir-local-variables-alist
3203 (assq-delete-all (car elt) dir-local-variables-alist)))
3204 (setq file-local-variables-alist
3205 (assq-delete-all (car elt) file-local-variables-alist)))
3206 (push elt file-local-variables-alist)))))
3208 ;; TODO? Warn once per file rather than once per session?
3209 (defvar hack-local-variables--warned-lexical nil)
3211 (defun hack-local-variables (&optional mode-only)
3212 "Parse and put into effect this buffer's local variables spec.
3213 Uses `hack-local-variables-apply' to apply the variables.
3215 If MODE-ONLY is non-nil, all we do is check whether a \"mode:\"
3216 is specified, and return the corresponding mode symbol, or nil.
3217 In this case, we try to ignore minor-modes, and only return a
3218 major-mode.
3220 If `enable-local-variables' or `local-enable-local-variables' is nil,
3221 this function does nothing. If `inhibit-local-variables-regexps'
3222 applies to the file in question, the file is not scanned for
3223 local variables, but directory-local variables may still be applied."
3224 ;; We don't let inhibit-local-variables-p influence the value of
3225 ;; enable-local-variables, because then it would affect dir-local
3226 ;; variables. We don't want to search eg tar files for file local
3227 ;; variable sections, but there is no reason dir-locals cannot apply
3228 ;; to them. The real meaning of inhibit-local-variables-p is "do
3229 ;; not scan this file for local variables".
3230 (let ((enable-local-variables
3231 (and local-enable-local-variables enable-local-variables))
3232 result)
3233 (unless mode-only
3234 (setq file-local-variables-alist nil)
3235 (report-errors "Directory-local variables error: %s"
3236 ;; Note this is a no-op if enable-local-variables is nil.
3237 (hack-dir-local-variables)))
3238 ;; This entire function is basically a no-op if enable-local-variables
3239 ;; is nil. All it does is set file-local-variables-alist to nil.
3240 (when enable-local-variables
3241 ;; This part used to ignore enable-local-variables when mode-only
3242 ;; was non-nil. That was inappropriate, eg consider the
3243 ;; (artificial) example of:
3244 ;; (setq local-enable-local-variables nil)
3245 ;; Open a file foo.txt that contains "mode: sh".
3246 ;; It correctly opens in text-mode.
3247 ;; M-x set-visited-file name foo.c, and it incorrectly stays in text-mode.
3248 (unless (or (inhibit-local-variables-p)
3249 ;; If MODE-ONLY is non-nil, and the prop line specifies a
3250 ;; mode, then we're done, and have no need to scan further.
3251 (and (setq result (hack-local-variables-prop-line mode-only))
3252 mode-only))
3253 ;; Look for "Local variables:" line in last page.
3254 (save-excursion
3255 (goto-char (point-max))
3256 (search-backward "\n\^L" (max (- (point-max) 3000) (point-min))
3257 'move)
3258 (when (let ((case-fold-search t))
3259 (search-forward "Local Variables:" nil t))
3260 (skip-chars-forward " \t")
3261 ;; suffix is what comes after "local variables:" in its line.
3262 ;; prefix is what comes before "local variables:" in its line.
3263 (let ((suffix
3264 (concat
3265 (regexp-quote (buffer-substring (point)
3266 (line-end-position)))
3267 "$"))
3268 (prefix
3269 (concat "^" (regexp-quote
3270 (buffer-substring (line-beginning-position)
3271 (match-beginning 0))))))
3273 (forward-line 1)
3274 (let ((startpos (point))
3275 endpos
3276 (thisbuf (current-buffer)))
3277 (save-excursion
3278 (unless (let ((case-fold-search t))
3279 (re-search-forward
3280 (concat prefix "[ \t]*End:[ \t]*" suffix)
3281 nil t))
3282 ;; This used to be an error, but really all it means is
3283 ;; that this may simply not be a local-variables section,
3284 ;; so just ignore it.
3285 (message "Local variables list is not properly terminated"))
3286 (beginning-of-line)
3287 (setq endpos (point)))
3289 (with-temp-buffer
3290 (insert-buffer-substring thisbuf startpos endpos)
3291 (goto-char (point-min))
3292 (subst-char-in-region (point) (point-max) ?\^m ?\n)
3293 (while (not (eobp))
3294 ;; Discard the prefix.
3295 (if (looking-at prefix)
3296 (delete-region (point) (match-end 0))
3297 (error "Local variables entry is missing the prefix"))
3298 (end-of-line)
3299 ;; Discard the suffix.
3300 (if (looking-back suffix)
3301 (delete-region (match-beginning 0) (point))
3302 (error "Local variables entry is missing the suffix"))
3303 (forward-line 1))
3304 (goto-char (point-min))
3306 (while (not (or (eobp)
3307 (and mode-only result)))
3308 ;; Find the variable name;
3309 (unless (looking-at hack-local-variable-regexp)
3310 (error "Malformed local variable line: %S"
3311 (buffer-substring-no-properties
3312 (point) (line-end-position))))
3313 (goto-char (match-end 1))
3314 (let* ((str (match-string 1))
3315 (var (intern str))
3316 val val2)
3317 (and (equal (downcase (symbol-name var)) "mode")
3318 (setq var 'mode))
3319 ;; Read the variable value.
3320 (skip-chars-forward "^:")
3321 (forward-char 1)
3322 (let ((read-circle nil))
3323 (setq val (read (current-buffer))))
3324 (if mode-only
3325 (and (eq var 'mode)
3326 ;; Specifying minor-modes via mode: is
3327 ;; deprecated, but try to reject them anyway.
3328 (not (string-match
3329 "-minor\\'"
3330 (setq val2 (downcase (symbol-name val)))))
3331 (setq result (intern (concat val2 "-mode"))))
3332 (cond ((eq var 'coding))
3333 ((eq var 'lexical-binding)
3334 (unless hack-local-variables--warned-lexical
3335 (setq hack-local-variables--warned-lexical t)
3336 (display-warning
3337 :warning
3338 (format "%s: `lexical-binding' at end of file unreliable"
3339 (file-name-nondirectory
3340 (or buffer-file-name ""))))))
3342 (ignore-errors
3343 (push (cons (if (eq var 'eval)
3344 'eval
3345 (indirect-variable var))
3346 val) result))))))
3347 (forward-line 1))))))))
3348 ;; Now we've read all the local variables.
3349 ;; If MODE-ONLY is non-nil, return whether the mode was specified.
3350 (if mode-only result
3351 ;; Otherwise, set the variables.
3352 (hack-local-variables-filter result nil)
3353 (hack-local-variables-apply)))))
3355 (defun hack-local-variables-apply ()
3356 "Apply the elements of `file-local-variables-alist'.
3357 If there are any elements, runs `before-hack-local-variables-hook',
3358 then calls `hack-one-local-variable' to apply the alist elements one by one.
3359 Finishes by running `hack-local-variables-hook', regardless of whether
3360 the alist is empty or not.
3362 Note that this function ignores a `mode' entry if it specifies the same
3363 major mode as the buffer already has."
3364 (when file-local-variables-alist
3365 ;; Any 'evals must run in the Right sequence.
3366 (setq file-local-variables-alist
3367 (nreverse file-local-variables-alist))
3368 (run-hooks 'before-hack-local-variables-hook)
3369 (dolist (elt file-local-variables-alist)
3370 (hack-one-local-variable (car elt) (cdr elt))))
3371 (run-hooks 'hack-local-variables-hook))
3373 (defun safe-local-variable-p (sym val)
3374 "Non-nil if SYM is safe as a file-local variable with value VAL.
3375 It is safe if any of these conditions are met:
3377 * There is a matching entry (SYM . VAL) in the
3378 `safe-local-variable-values' user option.
3380 * The `safe-local-variable' property of SYM is a function that
3381 evaluates to a non-nil value with VAL as an argument."
3382 (or (member (cons sym val) safe-local-variable-values)
3383 (let ((safep (get sym 'safe-local-variable)))
3384 (and (functionp safep)
3385 ;; If the function signals an error, that means it
3386 ;; can't assure us that the value is safe.
3387 (with-demoted-errors (funcall safep val))))))
3389 (defun risky-local-variable-p (sym &optional _ignored)
3390 "Non-nil if SYM could be dangerous as a file-local variable.
3391 It is dangerous if either of these conditions are met:
3393 * Its `risky-local-variable' property is non-nil.
3395 * Its name ends with \"hook(s)\", \"function(s)\", \"form(s)\", \"map\",
3396 \"program\", \"command(s)\", \"predicate(s)\", \"frame-alist\",
3397 \"mode-alist\", \"font-lock-(syntactic-)keyword*\",
3398 \"map-alist\", or \"bindat-spec\"."
3399 ;; If this is an alias, check the base name.
3400 (condition-case nil
3401 (setq sym (indirect-variable sym))
3402 (error nil))
3403 (or (get sym 'risky-local-variable)
3404 (string-match "-hooks?$\\|-functions?$\\|-forms?$\\|-program$\\|\
3405 -commands?$\\|-predicates?$\\|font-lock-keywords$\\|font-lock-keywords\
3406 -[0-9]+$\\|font-lock-syntactic-keywords$\\|-frame-alist$\\|-mode-alist$\\|\
3407 -map$\\|-map-alist$\\|-bindat-spec$" (symbol-name sym))))
3409 (defun hack-one-local-variable-quotep (exp)
3410 (and (consp exp) (eq (car exp) 'quote) (consp (cdr exp))))
3412 (defun hack-one-local-variable-constantp (exp)
3413 (or (and (not (symbolp exp)) (not (consp exp)))
3414 (memq exp '(t nil))
3415 (keywordp exp)
3416 (hack-one-local-variable-quotep exp)))
3418 (defun hack-one-local-variable-eval-safep (exp)
3419 "Return t if it is safe to eval EXP when it is found in a file."
3420 (or (not (consp exp))
3421 ;; Detect certain `put' expressions.
3422 (and (eq (car exp) 'put)
3423 (hack-one-local-variable-quotep (nth 1 exp))
3424 (hack-one-local-variable-quotep (nth 2 exp))
3425 (let ((prop (nth 1 (nth 2 exp)))
3426 (val (nth 3 exp)))
3427 (cond ((memq prop '(lisp-indent-hook
3428 lisp-indent-function
3429 scheme-indent-function))
3430 ;; Only allow safe values (not functions).
3431 (or (numberp val)
3432 (and (hack-one-local-variable-quotep val)
3433 (eq (nth 1 val) 'defun))))
3434 ((eq prop 'edebug-form-spec)
3435 ;; Only allow indirect form specs.
3436 ;; During bootstrapping, edebug-basic-spec might not be
3437 ;; defined yet.
3438 (and (fboundp 'edebug-basic-spec)
3439 (hack-one-local-variable-quotep val)
3440 (edebug-basic-spec (nth 1 val)))))))
3441 ;; Allow expressions that the user requested.
3442 (member exp safe-local-eval-forms)
3443 ;; Certain functions can be allowed with safe arguments
3444 ;; or can specify verification functions to try.
3445 (and (symbolp (car exp))
3446 ;; Allow (minor)-modes calls with no arguments.
3447 ;; This obsoletes the use of "mode:" for such things. (Bug#8613)
3448 (or (and (member (cdr exp) '(nil (1) (0) (-1)))
3449 (string-match "-mode\\'" (symbol-name (car exp))))
3450 (let ((prop (get (car exp) 'safe-local-eval-function)))
3451 (cond ((eq prop t)
3452 (let ((ok t))
3453 (dolist (arg (cdr exp))
3454 (unless (hack-one-local-variable-constantp arg)
3455 (setq ok nil)))
3456 ok))
3457 ((functionp prop)
3458 (funcall prop exp))
3459 ((listp prop)
3460 (let ((ok nil))
3461 (dolist (function prop)
3462 (if (funcall function exp)
3463 (setq ok t)))
3464 ok))))))))
3466 (defun hack-one-local-variable--obsolete (var)
3467 (let ((o (get var 'byte-obsolete-variable)))
3468 (when o
3469 (let ((instead (nth 0 o))
3470 (since (nth 2 o)))
3471 (message "%s is obsolete%s; %s"
3472 var (if since (format " (since %s)" since))
3473 (if (stringp instead) instead
3474 (format "use `%s' instead" instead)))))))
3476 (defun hack-one-local-variable (var val)
3477 "Set local variable VAR with value VAL.
3478 If VAR is `mode', call `VAL-mode' as a function unless it's
3479 already the major mode."
3480 (pcase var
3481 (`mode
3482 (let ((mode (intern (concat (downcase (symbol-name val))
3483 "-mode"))))
3484 (unless (eq (indirect-function mode)
3485 (indirect-function major-mode))
3486 (funcall mode))))
3487 (`eval
3488 (pcase val
3489 (`(add-hook ',hook . ,_) (hack-one-local-variable--obsolete hook)))
3490 (save-excursion (eval val)))
3492 (hack-one-local-variable--obsolete var)
3493 ;; Make sure the string has no text properties.
3494 ;; Some text properties can get evaluated in various ways,
3495 ;; so it is risky to put them on with a local variable list.
3496 (if (stringp val)
3497 (set-text-properties 0 (length val) nil val))
3498 (set (make-local-variable var) val))))
3500 ;;; Handling directory-local variables, aka project settings.
3502 (defvar dir-locals-class-alist '()
3503 "Alist mapping directory-local variable classes (symbols) to variable lists.")
3505 (defvar dir-locals-directory-cache '()
3506 "List of cached directory roots for directory-local variable classes.
3507 Each element in this list has the form (DIR CLASS MTIME).
3508 DIR is the name of the directory.
3509 CLASS is the name of a variable class (a symbol).
3510 MTIME is the recorded modification time of the directory-local
3511 variables file associated with this entry. This time is a list
3512 of integers (the same format as `file-attributes'), and is
3513 used to test whether the cache entry is still valid.
3514 Alternatively, MTIME can be nil, which means the entry is always
3515 considered valid.")
3517 (defsubst dir-locals-get-class-variables (class)
3518 "Return the variable list for CLASS."
3519 (cdr (assq class dir-locals-class-alist)))
3521 (defun dir-locals-collect-mode-variables (mode-variables variables)
3522 "Collect directory-local variables from MODE-VARIABLES.
3523 VARIABLES is the initial list of variables.
3524 Returns the new list."
3525 (dolist (pair mode-variables variables)
3526 (let* ((variable (car pair))
3527 (value (cdr pair))
3528 (slot (assq variable variables)))
3529 ;; If variables are specified more than once, only use the last. (Why?)
3530 ;; The pseudo-variables mode and eval are different (bug#3430).
3531 (if (and slot (not (memq variable '(mode eval))))
3532 (setcdr slot value)
3533 ;; Need a new cons in case we setcdr later.
3534 (push (cons variable value) variables)))))
3536 (defun dir-locals-collect-variables (class-variables root variables)
3537 "Collect entries from CLASS-VARIABLES into VARIABLES.
3538 ROOT is the root directory of the project.
3539 Return the new variables list."
3540 (let* ((file-name (buffer-file-name))
3541 (sub-file-name (if file-name
3542 ;; FIXME: Why not use file-relative-name?
3543 (substring file-name (length root)))))
3544 (condition-case err
3545 (dolist (entry class-variables variables)
3546 (let ((key (car entry)))
3547 (cond
3548 ((stringp key)
3549 ;; Don't include this in the previous condition, because we
3550 ;; want to filter all strings before the next condition.
3551 (when (and sub-file-name
3552 (>= (length sub-file-name) (length key))
3553 (string-prefix-p key sub-file-name))
3554 (setq variables (dir-locals-collect-variables
3555 (cdr entry) root variables))))
3556 ((or (not key)
3557 (derived-mode-p key))
3558 (let* ((alist (cdr entry))
3559 (subdirs (assq 'subdirs alist)))
3560 (if (or (not subdirs)
3561 (progn
3562 (setq alist (delq subdirs alist))
3563 (cdr-safe subdirs))
3564 ;; TODO someone might want to extend this to allow
3565 ;; integer values for subdir, where N means
3566 ;; variables apply to this directory and N levels
3567 ;; below it (0 == nil).
3568 (equal root default-directory))
3569 (setq variables (dir-locals-collect-mode-variables
3570 alist variables))))))))
3571 (error
3572 ;; The file's content might be invalid (e.g. have a merge conflict), but
3573 ;; that shouldn't prevent the user from opening the file.
3574 (message ".dir-locals error: %s" (error-message-string err))
3575 nil))))
3577 (defun dir-locals-set-directory-class (directory class &optional mtime)
3578 "Declare that the DIRECTORY root is an instance of CLASS.
3579 DIRECTORY is the name of a directory, a string.
3580 CLASS is the name of a project class, a symbol.
3581 MTIME is either the modification time of the directory-local
3582 variables file that defined this class, or nil.
3584 When a file beneath DIRECTORY is visited, the mode-specific
3585 variables from CLASS are applied to the buffer. The variables
3586 for a class are defined using `dir-locals-set-class-variables'."
3587 (setq directory (file-name-as-directory (expand-file-name directory)))
3588 (unless (assq class dir-locals-class-alist)
3589 (error "No such class `%s'" (symbol-name class)))
3590 (push (list directory class mtime) dir-locals-directory-cache))
3592 (defun dir-locals-set-class-variables (class variables)
3593 "Map the type CLASS to a list of variable settings.
3594 CLASS is the project class, a symbol. VARIABLES is a list
3595 that declares directory-local variables for the class.
3596 An element in VARIABLES is either of the form:
3597 (MAJOR-MODE . ALIST)
3599 (DIRECTORY . LIST)
3601 In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
3602 whose elements are of the form (VARIABLE . VALUE).
3604 In the second form, DIRECTORY is a directory name (a string), and
3605 LIST is a list of the form accepted by the function.
3607 When a file is visited, the file's class is found. A directory
3608 may be assigned a class using `dir-locals-set-directory-class'.
3609 Then variables are set in the file's buffer according to the
3610 VARIABLES list of the class. The list is processed in order.
3612 * If the element is of the form (MAJOR-MODE . ALIST), and the
3613 buffer's major mode is derived from MAJOR-MODE (as determined
3614 by `derived-mode-p'), then all the variables in ALIST are
3615 applied. A MAJOR-MODE of nil may be used to match any buffer.
3616 `make-local-variable' is called for each variable before it is
3617 set.
3619 * If the element is of the form (DIRECTORY . LIST), and DIRECTORY
3620 is an initial substring of the file's directory, then LIST is
3621 applied by recursively following these rules."
3622 (let ((elt (assq class dir-locals-class-alist)))
3623 (if elt
3624 (setcdr elt variables)
3625 (push (cons class variables) dir-locals-class-alist))))
3627 (defconst dir-locals-file ".dir-locals.el"
3628 "File that contains directory-local variables.
3629 It has to be constant to enforce uniform values
3630 across different environments and users.")
3632 (defun dir-locals-find-file (file)
3633 "Find the directory-local variables for FILE.
3634 This searches upward in the directory tree from FILE.
3635 It stops at the first directory that has been registered in
3636 `dir-locals-directory-cache' or contains a `dir-locals-file'.
3637 If it finds an entry in the cache, it checks that it is valid.
3638 A cache entry with no modification time element (normally, one that
3639 has been assigned directly using `dir-locals-set-directory-class', not
3640 set from a file) is always valid.
3641 A cache entry based on a `dir-locals-file' is valid if the modification
3642 time stored in the cache matches the current file modification time.
3643 If not, the cache entry is cleared so that the file will be re-read.
3645 This function returns either nil (no directory local variables found),
3646 or the matching entry from `dir-locals-directory-cache' (a list),
3647 or the full path to the `dir-locals-file' (a string) in the case
3648 of no valid cache entry."
3649 (setq file (expand-file-name file))
3650 (let* ((dir-locals-file-name
3651 (if (eq system-type 'ms-dos)
3652 (dosified-file-name dir-locals-file)
3653 dir-locals-file))
3654 (locals-file (locate-dominating-file file dir-locals-file-name))
3655 (dir-elt nil))
3656 ;; `locate-dominating-file' may have abbreviated the name.
3657 (and locals-file
3658 (setq locals-file (expand-file-name dir-locals-file-name locals-file)))
3659 ;; Let dir-locals-read-from-file inform us via demoted-errors
3660 ;; about unreadable files, etc.
3661 ;; Maybe we'd want to keep searching though - that is
3662 ;; a locate-dominating-file issue.
3663 ;;; (or (not (file-readable-p locals-file))
3664 ;;; (not (file-regular-p locals-file)))
3665 ;;; (setq locals-file nil))
3666 ;; Find the best cached value in `dir-locals-directory-cache'.
3667 (dolist (elt dir-locals-directory-cache)
3668 (when (and (eq t (compare-strings file nil (length (car elt))
3669 (car elt) nil nil
3670 (memq system-type
3671 '(windows-nt cygwin ms-dos))))
3672 (> (length (car elt)) (length (car dir-elt))))
3673 (setq dir-elt elt)))
3674 (if (and dir-elt
3675 (or (null locals-file)
3676 (<= (length (file-name-directory locals-file))
3677 (length (car dir-elt)))))
3678 ;; Found a potential cache entry. Check validity.
3679 ;; A cache entry with no MTIME is assumed to always be valid
3680 ;; (ie, set directly, not from a dir-locals file).
3681 ;; Note, we don't bother to check that there is a matching class
3682 ;; element in dir-locals-class-alist, since that's done by
3683 ;; dir-locals-set-directory-class.
3684 (if (or (null (nth 2 dir-elt))
3685 (let ((cached-file (expand-file-name dir-locals-file-name
3686 (car dir-elt))))
3687 (and (file-readable-p cached-file)
3688 (equal (nth 2 dir-elt)
3689 (nth 5 (file-attributes cached-file))))))
3690 ;; This cache entry is OK.
3691 dir-elt
3692 ;; This cache entry is invalid; clear it.
3693 (setq dir-locals-directory-cache
3694 (delq dir-elt dir-locals-directory-cache))
3695 ;; Return the first existing dir-locals file. Might be the same
3696 ;; as dir-elt's, might not (eg latter might have been deleted).
3697 locals-file)
3698 ;; No cache entry.
3699 locals-file)))
3701 (defun dir-locals-read-from-file (file)
3702 "Load a variables FILE and register a new class and instance.
3703 FILE is the name of the file holding the variables to apply.
3704 The new class name is the same as the directory in which FILE
3705 is found. Returns the new class name."
3706 (with-temp-buffer
3707 (with-demoted-errors "Error reading dir-locals: %S"
3708 (insert-file-contents file)
3709 (unless (zerop (buffer-size))
3710 (let* ((dir-name (file-name-directory file))
3711 (class-name (intern dir-name))
3712 (variables (let ((read-circle nil))
3713 (read (current-buffer)))))
3714 (dir-locals-set-class-variables class-name variables)
3715 (dir-locals-set-directory-class dir-name class-name
3716 (nth 5 (file-attributes file)))
3717 class-name)))))
3719 (defcustom enable-remote-dir-locals nil
3720 "Non-nil means dir-local variables will be applied to remote files."
3721 :version "24.3"
3722 :type 'boolean
3723 :group 'find-file)
3725 (defvar hack-dir-local-variables--warned-coding nil)
3727 (defun hack-dir-local-variables ()
3728 "Read per-directory local variables for the current buffer.
3729 Store the directory-local variables in `dir-local-variables-alist'
3730 and `file-local-variables-alist', without applying them.
3732 This does nothing if either `enable-local-variables' or
3733 `enable-dir-local-variables' are nil."
3734 (when (and enable-local-variables
3735 enable-dir-local-variables
3736 (or enable-remote-dir-locals
3737 (not (file-remote-p (or (buffer-file-name)
3738 default-directory)))))
3739 ;; Find the variables file.
3740 (let ((variables-file (dir-locals-find-file
3741 (or (buffer-file-name) default-directory)))
3742 (class nil)
3743 (dir-name nil))
3744 (cond
3745 ((stringp variables-file)
3746 (setq dir-name (file-name-directory variables-file)
3747 class (dir-locals-read-from-file variables-file)))
3748 ((consp variables-file)
3749 (setq dir-name (nth 0 variables-file))
3750 (setq class (nth 1 variables-file))))
3751 (when class
3752 (let ((variables
3753 (dir-locals-collect-variables
3754 (dir-locals-get-class-variables class) dir-name nil)))
3755 (when variables
3756 (dolist (elt variables)
3757 (if (eq (car elt) 'coding)
3758 (unless hack-dir-local-variables--warned-coding
3759 (setq hack-dir-local-variables--warned-coding t)
3760 (display-warning :warning
3761 "Coding cannot be specified by dir-locals"))
3762 (unless (memq (car elt) '(eval mode))
3763 (setq dir-local-variables-alist
3764 (assq-delete-all (car elt) dir-local-variables-alist)))
3765 (push elt dir-local-variables-alist)))
3766 (hack-local-variables-filter variables dir-name)))))))
3768 (defun hack-dir-local-variables-non-file-buffer ()
3769 "Apply directory-local variables to a non-file buffer.
3770 For non-file buffers, such as Dired buffers, directory-local
3771 variables are looked for in `default-directory' and its parent
3772 directories."
3773 (hack-dir-local-variables)
3774 (hack-local-variables-apply))
3777 (defcustom change-major-mode-with-file-name t
3778 "Non-nil means \\[write-file] should set the major mode from the file name.
3779 However, the mode will not be changed if
3780 \(1) a local variables list or the `-*-' line specifies a major mode, or
3781 \(2) the current major mode is a \"special\" mode,
3782 \ not suitable for ordinary files, or
3783 \(3) the new file name does not particularly specify any mode."
3784 :type 'boolean
3785 :group 'editing-basics)
3787 (defun set-visited-file-name (filename &optional no-query along-with-file)
3788 "Change name of file visited in current buffer to FILENAME.
3789 This also renames the buffer to correspond to the new file.
3790 The next time the buffer is saved it will go in the newly specified file.
3791 FILENAME nil or an empty string means mark buffer as not visiting any file.
3792 Remember to delete the initial contents of the minibuffer
3793 if you wish to pass an empty string as the argument.
3795 The optional second argument NO-QUERY, if non-nil, inhibits asking for
3796 confirmation in the case where another buffer is already visiting FILENAME.
3798 The optional third argument ALONG-WITH-FILE, if non-nil, means that
3799 the old visited file has been renamed to the new name FILENAME."
3800 (interactive "FSet visited file name: ")
3801 (if (buffer-base-buffer)
3802 (error "An indirect buffer cannot visit a file"))
3803 (let (truename old-try-locals)
3804 (if filename
3805 (setq filename
3806 (if (string-equal filename "")
3808 (expand-file-name filename))))
3809 (if filename
3810 (progn
3811 (setq truename (file-truename filename))
3812 (if find-file-visit-truename
3813 (setq filename truename))))
3814 (if filename
3815 (let ((new-name (file-name-nondirectory filename)))
3816 (if (string= new-name "")
3817 (error "Empty file name"))))
3818 (let ((buffer (and filename (find-buffer-visiting filename))))
3819 (and buffer (not (eq buffer (current-buffer)))
3820 (not no-query)
3821 (not (y-or-n-p (format "A buffer is visiting %s; proceed? "
3822 filename)))
3823 (error "Aborted")))
3824 (or (equal filename buffer-file-name)
3825 (progn
3826 (and filename (lock-buffer filename))
3827 (unlock-buffer)))
3828 (setq old-try-locals (not (inhibit-local-variables-p))
3829 buffer-file-name filename)
3830 (if filename ; make buffer name reflect filename.
3831 (let ((new-name (file-name-nondirectory buffer-file-name)))
3832 (setq default-directory (file-name-directory buffer-file-name))
3833 ;; If new-name == old-name, renaming would add a spurious <2>
3834 ;; and it's considered as a feature in rename-buffer.
3835 (or (string= new-name (buffer-name))
3836 (rename-buffer new-name t))))
3837 (setq buffer-backed-up nil)
3838 (or along-with-file
3839 (clear-visited-file-modtime))
3840 ;; Abbreviate the file names of the buffer.
3841 (if truename
3842 (progn
3843 (setq buffer-file-truename (abbreviate-file-name truename))
3844 (if find-file-visit-truename
3845 (setq buffer-file-name truename))))
3846 (setq buffer-file-number
3847 (if filename
3848 (nthcdr 10 (file-attributes buffer-file-name))
3849 nil))
3850 ;; write-file-functions is normally used for things like ftp-find-file
3851 ;; that visit things that are not local files as if they were files.
3852 ;; Changing to visit an ordinary local file instead should flush the hook.
3853 (kill-local-variable 'write-file-functions)
3854 (kill-local-variable 'local-write-file-hooks)
3855 (kill-local-variable 'revert-buffer-function)
3856 (kill-local-variable 'backup-inhibited)
3857 ;; If buffer was read-only because of version control,
3858 ;; that reason is gone now, so make it writable.
3859 (if vc-mode
3860 (setq buffer-read-only nil))
3861 (kill-local-variable 'vc-mode)
3862 ;; Turn off backup files for certain file names.
3863 ;; Since this is a permanent local, the major mode won't eliminate it.
3864 (and buffer-file-name
3865 backup-enable-predicate
3866 (not (funcall backup-enable-predicate buffer-file-name))
3867 (progn
3868 (make-local-variable 'backup-inhibited)
3869 (setq backup-inhibited t)))
3870 (let ((oauto buffer-auto-save-file-name))
3871 ;; If auto-save was not already on, turn it on if appropriate.
3872 (if (not buffer-auto-save-file-name)
3873 (and buffer-file-name auto-save-default
3874 (auto-save-mode t))
3875 ;; If auto save is on, start using a new name.
3876 ;; We deliberately don't rename or delete the old auto save
3877 ;; for the old visited file name. This is because perhaps
3878 ;; the user wants to save the new state and then compare with the
3879 ;; previous state from the auto save file.
3880 (setq buffer-auto-save-file-name
3881 (make-auto-save-file-name)))
3882 ;; Rename the old auto save file if any.
3883 (and oauto buffer-auto-save-file-name
3884 (file-exists-p oauto)
3885 (rename-file oauto buffer-auto-save-file-name t)))
3886 (and buffer-file-name
3887 (not along-with-file)
3888 (set-buffer-modified-p t))
3889 ;; Update the major mode, if the file name determines it.
3890 (condition-case nil
3891 ;; Don't change the mode if it is special.
3892 (or (not change-major-mode-with-file-name)
3893 (get major-mode 'mode-class)
3894 ;; Don't change the mode if the local variable list specifies it.
3895 ;; The file name can influence whether the local variables apply.
3896 (and old-try-locals
3897 ;; h-l-v also checks it, but might as well be explicit.
3898 (not (inhibit-local-variables-p))
3899 (hack-local-variables t))
3900 ;; TODO consider making normal-mode handle this case.
3901 (let ((old major-mode))
3902 (set-auto-mode t)
3903 (or (eq old major-mode)
3904 (hack-local-variables))))
3905 (error nil))))
3907 (defun write-file (filename &optional confirm)
3908 "Write current buffer into file FILENAME.
3909 This makes the buffer visit that file, and marks it as not modified.
3911 If you specify just a directory name as FILENAME, that means to use
3912 the default file name but in that directory. You can also yank
3913 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
3915 If the buffer is not already visiting a file, the default file name
3916 for the output file is the buffer name.
3918 If optional second arg CONFIRM is non-nil, this function
3919 asks for confirmation before overwriting an existing file.
3920 Interactively, confirmation is required unless you supply a prefix argument."
3921 ;; (interactive "FWrite file: ")
3922 (interactive
3923 (list (if buffer-file-name
3924 (read-file-name "Write file: "
3925 nil nil nil nil)
3926 (read-file-name "Write file: " default-directory
3927 (expand-file-name
3928 (file-name-nondirectory (buffer-name))
3929 default-directory)
3930 nil nil))
3931 (not current-prefix-arg)))
3932 (or (null filename) (string-equal filename "")
3933 (progn
3934 ;; If arg is just a directory,
3935 ;; use the default file name, but in that directory.
3936 (if (file-directory-p filename)
3937 (setq filename (concat (file-name-as-directory filename)
3938 (file-name-nondirectory
3939 (or buffer-file-name (buffer-name))))))
3940 (and confirm
3941 (file-exists-p filename)
3942 ;; NS does its own confirm dialog.
3943 (not (and (eq (framep-on-display) 'ns)
3944 (listp last-nonmenu-event)
3945 use-dialog-box))
3946 (or (y-or-n-p (format "File `%s' exists; overwrite? " filename))
3947 (error "Canceled")))
3948 (set-visited-file-name filename (not confirm))))
3949 (set-buffer-modified-p t)
3950 ;; Make buffer writable if file is writable.
3951 (and buffer-file-name
3952 (file-writable-p buffer-file-name)
3953 (setq buffer-read-only nil))
3954 (save-buffer)
3955 ;; It's likely that the VC status at the new location is different from
3956 ;; the one at the old location.
3957 (vc-find-file-hook))
3959 (defun file-extended-attributes (filename)
3960 "Return an alist of extended attributes of file FILENAME.
3962 Extended attributes are platform-specific metadata about the file,
3963 such as SELinux context, list of ACL entries, etc."
3964 `((acl . ,(file-acl filename))
3965 (selinux-context . ,(file-selinux-context filename))))
3967 (defun set-file-extended-attributes (filename attributes)
3968 "Set extended attributes of file FILENAME to ATTRIBUTES.
3970 ATTRIBUTES must be an alist of file attributes as returned by
3971 `file-extended-attributes'."
3972 (dolist (elt attributes)
3973 (let ((attr (car elt))
3974 (val (cdr elt)))
3975 (cond ((eq attr 'acl)
3976 (set-file-acl filename val))
3977 ((eq attr 'selinux-context)
3978 (set-file-selinux-context filename val))))))
3980 (defun backup-buffer ()
3981 "Make a backup of the disk file visited by the current buffer, if appropriate.
3982 This is normally done before saving the buffer the first time.
3984 A backup may be done by renaming or by copying; see documentation of
3985 variable `make-backup-files'. If it's done by renaming, then the file is
3986 no longer accessible under its old name.
3988 The value is non-nil after a backup was made by renaming.
3989 It has the form (MODES EXTENDED-ATTRIBUTES BACKUPNAME).
3990 MODES is the result of `file-modes' on the original
3991 file; this means that the caller, after saving the buffer, should change
3992 the modes of the new file to agree with the old modes.
3993 EXTENDED-ATTRIBUTES is the result of `file-extended-attributes'
3994 on the original file; this means that the caller, after saving
3995 the buffer, should change the extended attributes of the new file
3996 to agree with the old attributes.
3997 BACKUPNAME is the backup file name, which is the old file renamed."
3998 (if (and make-backup-files (not backup-inhibited)
3999 (not buffer-backed-up)
4000 (file-exists-p buffer-file-name)
4001 (memq (aref (elt (file-attributes buffer-file-name) 8) 0)
4002 '(?- ?l)))
4003 (let ((real-file-name buffer-file-name)
4004 backup-info backupname targets setmodes)
4005 ;; If specified name is a symbolic link, chase it to the target.
4006 ;; Thus we make the backups in the directory where the real file is.
4007 (setq real-file-name (file-chase-links real-file-name))
4008 (setq backup-info (find-backup-file-name real-file-name)
4009 backupname (car backup-info)
4010 targets (cdr backup-info))
4011 ;; (if (file-directory-p buffer-file-name)
4012 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
4013 (if backup-info
4014 (condition-case ()
4015 (let ((delete-old-versions
4016 ;; If have old versions to maybe delete,
4017 ;; ask the user to confirm now, before doing anything.
4018 ;; But don't actually delete til later.
4019 (and targets
4020 (or (eq delete-old-versions t) (eq delete-old-versions nil))
4021 (or delete-old-versions
4022 (y-or-n-p (format "Delete excess backup versions of %s? "
4023 real-file-name)))))
4024 (modes (file-modes buffer-file-name))
4025 (extended-attributes
4026 (file-extended-attributes buffer-file-name)))
4027 ;; Actually write the back up file.
4028 (condition-case ()
4029 (if (or file-precious-flag
4030 ; (file-symlink-p buffer-file-name)
4031 backup-by-copying
4032 ;; Don't rename a suid or sgid file.
4033 (and modes (< 0 (logand modes #o6000)))
4034 (not (file-writable-p (file-name-directory real-file-name)))
4035 (and backup-by-copying-when-linked
4036 (> (file-nlinks real-file-name) 1))
4037 (and (or backup-by-copying-when-mismatch
4038 (integerp backup-by-copying-when-privileged-mismatch))
4039 (let ((attr (file-attributes real-file-name)))
4040 (and (or backup-by-copying-when-mismatch
4041 (and (integerp (nth 2 attr))
4042 (integerp backup-by-copying-when-privileged-mismatch)
4043 (<= (nth 2 attr) backup-by-copying-when-privileged-mismatch)))
4044 (not (file-ownership-preserved-p
4045 real-file-name t))))))
4046 (backup-buffer-copy real-file-name
4047 backupname modes
4048 extended-attributes)
4049 ;; rename-file should delete old backup.
4050 (rename-file real-file-name backupname t)
4051 (setq setmodes (list modes extended-attributes
4052 backupname)))
4053 (file-error
4054 ;; If trouble writing the backup, write it in
4055 ;; .emacs.d/%backup%.
4056 (setq backupname (locate-user-emacs-file "%backup%~"))
4057 (message "Cannot write backup file; backing up in %s"
4058 backupname)
4059 (sleep-for 1)
4060 (backup-buffer-copy real-file-name backupname
4061 modes extended-attributes)))
4062 (setq buffer-backed-up t)
4063 ;; Now delete the old versions, if desired.
4064 (if delete-old-versions
4065 (while targets
4066 (condition-case ()
4067 (delete-file (car targets))
4068 (file-error nil))
4069 (setq targets (cdr targets))))
4070 setmodes)
4071 (file-error nil))))))
4073 (defun backup-buffer-copy (from-name to-name modes extended-attributes)
4074 (let ((umask (default-file-modes)))
4075 (unwind-protect
4076 (progn
4077 ;; Create temp files with strict access rights. It's easy to
4078 ;; loosen them later, whereas it's impossible to close the
4079 ;; time-window of loose permissions otherwise.
4080 (set-default-file-modes ?\700)
4081 (when (condition-case nil
4082 ;; Try to overwrite old backup first.
4083 (copy-file from-name to-name t t t)
4084 (error t))
4085 (while (condition-case nil
4086 (progn
4087 (when (file-exists-p to-name)
4088 (delete-file to-name))
4089 (copy-file from-name to-name nil t t)
4090 nil)
4091 (file-already-exists t))
4092 ;; The file was somehow created by someone else between
4093 ;; `delete-file' and `copy-file', so let's try again.
4094 ;; rms says "I think there is also a possible race
4095 ;; condition for making backup files" (emacs-devel 20070821).
4096 nil)))
4097 ;; Reset the umask.
4098 (set-default-file-modes umask)))
4099 ;; If set-file-extended-attributes fails, fall back on set-file-modes.
4100 (unless (and extended-attributes
4101 (with-demoted-errors
4102 (set-file-extended-attributes to-name extended-attributes)))
4103 (and modes
4104 (set-file-modes to-name (logand modes #o1777)))))
4106 (defvar file-name-version-regexp
4107 "\\(?:~\\|\\.~[-[:alnum:]:#@^._]+\\(?:~[[:digit:]]+\\)?~\\)"
4108 ;; The last ~[[:digit]]+ matches relative versions in git,
4109 ;; e.g. `foo.js.~HEAD~1~'.
4110 "Regular expression matching the backup/version part of a file name.
4111 Used by `file-name-sans-versions'.")
4113 (defun file-name-sans-versions (name &optional keep-backup-version)
4114 "Return file NAME sans backup versions or strings.
4115 This is a separate procedure so your site-init or startup file can
4116 redefine it.
4117 If the optional argument KEEP-BACKUP-VERSION is non-nil,
4118 we do not remove backup version numbers, only true file version numbers.
4119 See also `file-name-version-regexp'."
4120 (let ((handler (find-file-name-handler name 'file-name-sans-versions)))
4121 (if handler
4122 (funcall handler 'file-name-sans-versions name keep-backup-version)
4123 (substring name 0
4124 (unless keep-backup-version
4125 (string-match (concat file-name-version-regexp "\\'")
4126 name))))))
4128 (defun file-ownership-preserved-p (file &optional group)
4129 "Return t if deleting FILE and rewriting it would preserve the owner.
4130 Return nil if FILE does not exist, or if deleting and recreating it
4131 might not preserve the owner. If GROUP is non-nil, check whether
4132 the group would be preserved too."
4133 (let ((handler (find-file-name-handler file 'file-ownership-preserved-p)))
4134 (if handler
4135 (funcall handler 'file-ownership-preserved-p file group)
4136 (let ((attributes (file-attributes file 'integer)))
4137 ;; Return t if the file doesn't exist, since it's true that no
4138 ;; information would be lost by an (attempted) delete and create.
4139 (or (null attributes)
4140 (and (or (= (nth 2 attributes) (user-uid))
4141 ;; Files created on Windows by Administrator (RID=500)
4142 ;; have the Administrators group (RID=544) recorded as
4143 ;; their owner. Rewriting them will still preserve the
4144 ;; owner.
4145 (and (eq system-type 'windows-nt)
4146 (= (user-uid) 500) (= (nth 2 attributes) 544)))
4147 (or (not group)
4148 ;; On BSD-derived systems files always inherit the parent
4149 ;; directory's group, so skip the group-gid test.
4150 (memq system-type '(berkeley-unix darwin gnu/kfreebsd))
4151 (= (nth 3 attributes) (group-gid)))
4152 (let* ((parent (or (file-name-directory file) "."))
4153 (parent-attributes (file-attributes parent 'integer)))
4154 (and parent-attributes
4155 ;; On some systems, a file created in a setuid directory
4156 ;; inherits that directory's owner.
4158 (= (nth 2 parent-attributes) (user-uid))
4159 (string-match "^...[^sS]" (nth 8 parent-attributes)))
4160 ;; On many systems, a file created in a setgid directory
4161 ;; inherits that directory's group. On some systems
4162 ;; this happens even if the setgid bit is not set.
4163 (or (not group)
4164 (= (nth 3 parent-attributes)
4165 (nth 3 attributes)))))))))))
4167 (defun file-name-sans-extension (filename)
4168 "Return FILENAME sans final \"extension\".
4169 The extension, in a file name, is the part that follows the last `.',
4170 except that a leading `.', if any, doesn't count."
4171 (save-match-data
4172 (let ((file (file-name-sans-versions (file-name-nondirectory filename)))
4173 directory)
4174 (if (and (string-match "\\.[^.]*\\'" file)
4175 (not (eq 0 (match-beginning 0))))
4176 (if (setq directory (file-name-directory filename))
4177 ;; Don't use expand-file-name here; if DIRECTORY is relative,
4178 ;; we don't want to expand it.
4179 (concat directory (substring file 0 (match-beginning 0)))
4180 (substring file 0 (match-beginning 0)))
4181 filename))))
4183 (defun file-name-extension (filename &optional period)
4184 "Return FILENAME's final \"extension\".
4185 The extension, in a file name, is the part that follows the last `.',
4186 excluding version numbers and backup suffixes,
4187 except that a leading `.', if any, doesn't count.
4188 Return nil for extensionless file names such as `foo'.
4189 Return the empty string for file names such as `foo.'.
4191 If PERIOD is non-nil, then the returned value includes the period
4192 that delimits the extension, and if FILENAME has no extension,
4193 the value is \"\"."
4194 (save-match-data
4195 (let ((file (file-name-sans-versions (file-name-nondirectory filename))))
4196 (if (and (string-match "\\.[^.]*\\'" file)
4197 (not (eq 0 (match-beginning 0))))
4198 (substring file (+ (match-beginning 0) (if period 0 1)))
4199 (if period
4200 "")))))
4202 (defun file-name-base (&optional filename)
4203 "Return the base name of the FILENAME: no directory, no extension.
4204 FILENAME defaults to `buffer-file-name'."
4205 (file-name-sans-extension
4206 (file-name-nondirectory (or filename (buffer-file-name)))))
4208 (defcustom make-backup-file-name-function
4209 #'make-backup-file-name--default-function
4210 "A function that `make-backup-file-name' uses to create backup file names.
4211 The function receives a single argument, the original file name.
4213 If you change this, you may need to change `backup-file-name-p' and
4214 `file-name-sans-versions' too.
4216 You could make this buffer-local to do something special for specific files.
4218 For historical reasons, a value of nil means to use the default function.
4219 This should not be relied upon.
4221 See also `backup-directory-alist'."
4222 :version "24.4" ; nil -> make-backup-file-name--default-function
4223 :group 'backup
4224 :type '(choice (const :tag "Deprecated way to get the default function" nil)
4225 (function :tag "Function")))
4227 (defcustom backup-directory-alist nil
4228 "Alist of filename patterns and backup directory names.
4229 Each element looks like (REGEXP . DIRECTORY). Backups of files with
4230 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
4231 relative or absolute. If it is absolute, so that all matching files
4232 are backed up into the same directory, the file names in this
4233 directory will be the full name of the file backed up with all
4234 directory separators changed to `!' to prevent clashes. This will not
4235 work correctly if your filesystem truncates the resulting name.
4237 For the common case of all backups going into one directory, the alist
4238 should contain a single element pairing \".\" with the appropriate
4239 directory name.
4241 If this variable is nil, or it fails to match a filename, the backup
4242 is made in the original file's directory.
4244 On MS-DOS filesystems without long names this variable is always
4245 ignored."
4246 :group 'backup
4247 :type '(repeat (cons (regexp :tag "Regexp matching filename")
4248 (directory :tag "Backup directory name"))))
4250 (defun normal-backup-enable-predicate (name)
4251 "Default `backup-enable-predicate' function.
4252 Checks for files in `temporary-file-directory',
4253 `small-temporary-file-directory', and /tmp."
4254 (let ((temporary-file-directory temporary-file-directory)
4255 caseless)
4256 ;; On MS-Windows, file-truename will convert short 8+3 aliases to
4257 ;; their long file-name equivalents, so compare-strings does TRT.
4258 (if (memq system-type '(ms-dos windows-nt))
4259 (setq temporary-file-directory (file-truename temporary-file-directory)
4260 name (file-truename name)
4261 caseless t))
4262 (not (or (let ((comp (compare-strings temporary-file-directory 0 nil
4263 name 0 nil caseless)))
4264 ;; Directory is under temporary-file-directory.
4265 (and (not (eq comp t))
4266 (< comp (- (length temporary-file-directory)))))
4267 (let ((comp (compare-strings "/tmp" 0 nil
4268 name 0 nil)))
4269 ;; Directory is under /tmp.
4270 (and (not (eq comp t))
4271 (< comp (- (length "/tmp")))))
4272 (if small-temporary-file-directory
4273 (let ((comp (compare-strings small-temporary-file-directory
4274 0 nil
4275 name 0 nil caseless)))
4276 ;; Directory is under small-temporary-file-directory.
4277 (and (not (eq comp t))
4278 (< comp (- (length small-temporary-file-directory))))))))))
4280 (defun make-backup-file-name (file)
4281 "Create the non-numeric backup file name for FILE.
4282 This calls the function that `make-backup-file-name-function' specifies,
4283 with a single argument FILE."
4284 (funcall (or make-backup-file-name-function
4285 #'make-backup-file-name--default-function)
4286 file))
4288 (defun make-backup-file-name--default-function (file)
4289 "Default function for `make-backup-file-name'.
4290 Normally this just returns FILE's name with `~' appended.
4291 It searches for a match for FILE in `backup-directory-alist'.
4292 If the directory for the backup doesn't exist, it is created."
4293 (if (and (eq system-type 'ms-dos)
4294 (not (msdos-long-file-names)))
4295 (let ((fn (file-name-nondirectory file)))
4296 (concat (file-name-directory file)
4297 (or (and (string-match "\\`[^.]+\\'" fn)
4298 (concat (match-string 0 fn) ".~"))
4299 (and (string-match "\\`[^.]+\\.\\(..?\\)?" fn)
4300 (concat (match-string 0 fn) "~")))))
4301 (concat (make-backup-file-name-1 file) "~")))
4303 (defun make-backup-file-name-1 (file)
4304 "Subroutine of `make-backup-file-name--default-function'.
4305 The function `find-backup-file-name' also uses this."
4306 (let ((alist backup-directory-alist)
4307 elt backup-directory abs-backup-directory)
4308 (while alist
4309 (setq elt (pop alist))
4310 (if (string-match (car elt) file)
4311 (setq backup-directory (cdr elt)
4312 alist nil)))
4313 ;; If backup-directory is relative, it should be relative to the
4314 ;; file's directory. By expanding explicitly here, we avoid
4315 ;; depending on default-directory.
4316 (if backup-directory
4317 (setq abs-backup-directory
4318 (expand-file-name backup-directory
4319 (file-name-directory file))))
4320 (if (and abs-backup-directory (not (file-exists-p abs-backup-directory)))
4321 (condition-case nil
4322 (make-directory abs-backup-directory 'parents)
4323 (file-error (setq backup-directory nil
4324 abs-backup-directory nil))))
4325 (if (null backup-directory)
4326 file
4327 (if (file-name-absolute-p backup-directory)
4328 (progn
4329 (when (memq system-type '(windows-nt ms-dos cygwin))
4330 ;; Normalize DOSish file names: downcase the drive
4331 ;; letter, if any, and replace the leading "x:" with
4332 ;; "/drive_x".
4333 (or (file-name-absolute-p file)
4334 (setq file (expand-file-name file))) ; make defaults explicit
4335 ;; Replace any invalid file-name characters (for the
4336 ;; case of backing up remote files).
4337 (setq file (expand-file-name (convert-standard-filename file)))
4338 (if (eq (aref file 1) ?:)
4339 (setq file (concat "/"
4340 "drive_"
4341 (char-to-string (downcase (aref file 0)))
4342 (if (eq (aref file 2) ?/)
4344 "/")
4345 (substring file 2)))))
4346 ;; Make the name unique by substituting directory
4347 ;; separators. It may not really be worth bothering about
4348 ;; doubling `!'s in the original name...
4349 (expand-file-name
4350 (subst-char-in-string
4351 ?/ ?!
4352 (replace-regexp-in-string "!" "!!" file))
4353 backup-directory))
4354 (expand-file-name (file-name-nondirectory file)
4355 (file-name-as-directory abs-backup-directory))))))
4357 (defun backup-file-name-p (file)
4358 "Return non-nil if FILE is a backup file name (numeric or not).
4359 This is a separate function so you can redefine it for customization.
4360 You may need to redefine `file-name-sans-versions' as well."
4361 (string-match "~\\'" file))
4363 (defvar backup-extract-version-start)
4365 ;; This is used in various files.
4366 ;; The usage of backup-extract-version-start is not very clean,
4367 ;; but I can't see a good alternative, so as of now I am leaving it alone.
4368 (defun backup-extract-version (fn)
4369 "Given the name of a numeric backup file, FN, return the backup number.
4370 Uses the free variable `backup-extract-version-start', whose value should be
4371 the index in the name where the version number begins."
4372 (if (and (string-match "[0-9]+~/?$" fn backup-extract-version-start)
4373 (= (match-beginning 0) backup-extract-version-start))
4374 (string-to-number (substring fn backup-extract-version-start -1))
4377 (defun find-backup-file-name (fn)
4378 "Find a file name for a backup file FN, and suggestions for deletions.
4379 Value is a list whose car is the name for the backup file
4380 and whose cdr is a list of old versions to consider deleting now.
4381 If the value is nil, don't make a backup.
4382 Uses `backup-directory-alist' in the same way as
4383 `make-backup-file-name--default-function' does."
4384 (let ((handler (find-file-name-handler fn 'find-backup-file-name)))
4385 ;; Run a handler for this function so that ange-ftp can refuse to do it.
4386 (if handler
4387 (funcall handler 'find-backup-file-name fn)
4388 (if (or (eq version-control 'never)
4389 ;; We don't support numbered backups on plain MS-DOS
4390 ;; when long file names are unavailable.
4391 (and (eq system-type 'ms-dos)
4392 (not (msdos-long-file-names))))
4393 (list (make-backup-file-name fn))
4394 (let* ((basic-name (make-backup-file-name-1 fn))
4395 (base-versions (concat (file-name-nondirectory basic-name)
4396 ".~"))
4397 (backup-extract-version-start (length base-versions))
4398 (high-water-mark 0)
4399 (number-to-delete 0)
4400 possibilities deserve-versions-p versions)
4401 (condition-case ()
4402 (setq possibilities (file-name-all-completions
4403 base-versions
4404 (file-name-directory basic-name))
4405 versions (sort (mapcar #'backup-extract-version
4406 possibilities)
4407 #'<)
4408 high-water-mark (apply 'max 0 versions)
4409 deserve-versions-p (or version-control
4410 (> high-water-mark 0))
4411 number-to-delete (- (length versions)
4412 kept-old-versions
4413 kept-new-versions
4414 -1))
4415 (file-error (setq possibilities nil)))
4416 (if (not deserve-versions-p)
4417 (list (make-backup-file-name fn))
4418 (cons (format "%s.~%d~" basic-name (1+ high-water-mark))
4419 (if (and (> number-to-delete 0)
4420 ;; Delete nothing if there is overflow
4421 ;; in the number of versions to keep.
4422 (>= (+ kept-new-versions kept-old-versions -1) 0))
4423 (mapcar (lambda (n)
4424 (format "%s.~%d~" basic-name n))
4425 (let ((v (nthcdr kept-old-versions versions)))
4426 (rplacd (nthcdr (1- number-to-delete) v) ())
4427 v))))))))))
4429 (defun file-nlinks (filename)
4430 "Return number of names file FILENAME has."
4431 (car (cdr (file-attributes filename))))
4433 ;; (defun file-relative-name (filename &optional directory)
4434 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4435 ;; This function returns a relative file name which is equivalent to FILENAME
4436 ;; when used with that default directory as the default.
4437 ;; If this is impossible (which can happen on MSDOS and Windows
4438 ;; when the file name and directory use different drive names)
4439 ;; then it returns FILENAME."
4440 ;; (save-match-data
4441 ;; (let ((fname (expand-file-name filename)))
4442 ;; (setq directory (file-name-as-directory
4443 ;; (expand-file-name (or directory default-directory))))
4444 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
4445 ;; ;; drive names, they can't be relative, so return the absolute name.
4446 ;; (if (and (or (eq system-type 'ms-dos)
4447 ;; (eq system-type 'cygwin)
4448 ;; (eq system-type 'windows-nt))
4449 ;; (not (string-equal (substring fname 0 2)
4450 ;; (substring directory 0 2))))
4451 ;; filename
4452 ;; (let ((ancestor ".")
4453 ;; (fname-dir (file-name-as-directory fname)))
4454 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
4455 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
4456 ;; (setq directory (file-name-directory (substring directory 0 -1))
4457 ;; ancestor (if (equal ancestor ".")
4458 ;; ".."
4459 ;; (concat "../" ancestor))))
4460 ;; ;; Now ancestor is empty, or .., or ../.., etc.
4461 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
4462 ;; ;; We matched within FNAME's directory part.
4463 ;; ;; Add the rest of FNAME onto ANCESTOR.
4464 ;; (let ((rest (substring fname (match-end 0))))
4465 ;; (if (and (equal ancestor ".")
4466 ;; (not (equal rest "")))
4467 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
4468 ;; rest
4469 ;; (concat (file-name-as-directory ancestor) rest)))
4470 ;; ;; We matched FNAME's directory equivalent.
4471 ;; ancestor))))))
4473 (defun file-relative-name (filename &optional directory)
4474 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4475 This function returns a relative file name which is equivalent to FILENAME
4476 when used with that default directory as the default.
4477 If FILENAME is a relative file name, it will be interpreted as existing in
4478 `default-directory'.
4479 If FILENAME and DIRECTORY lie on different machines or on different drives
4480 on a DOS/Windows machine, it returns FILENAME in expanded form."
4481 (save-match-data
4482 (setq directory
4483 (file-name-as-directory (expand-file-name (or directory
4484 default-directory))))
4485 (setq filename (expand-file-name filename))
4486 (let ((fremote (file-remote-p filename))
4487 (dremote (file-remote-p directory))
4488 (fold-case (or (memq system-type '(ms-dos cygwin windows-nt))
4489 read-file-name-completion-ignore-case)))
4490 (if ;; Conditions for separate trees
4492 ;; Test for different filesystems on DOS/Windows
4493 (and
4494 ;; Should `cygwin' really be included here? --stef
4495 (memq system-type '(ms-dos cygwin windows-nt))
4497 ;; Test for different drive letters
4498 (not (eq t (compare-strings filename 0 2 directory 0 2 fold-case)))
4499 ;; Test for UNCs on different servers
4500 (not (eq t (compare-strings
4501 (progn
4502 (if (string-match "\\`//\\([^:/]+\\)/" filename)
4503 (match-string 1 filename)
4504 ;; Windows file names cannot have ? in
4505 ;; them, so use that to detect when
4506 ;; neither FILENAME nor DIRECTORY is a
4507 ;; UNC.
4508 "?"))
4509 0 nil
4510 (progn
4511 (if (string-match "\\`//\\([^:/]+\\)/" directory)
4512 (match-string 1 directory)
4513 "?"))
4514 0 nil t)))))
4515 ;; Test for different remote file system identification
4516 (not (equal fremote dremote)))
4517 filename
4518 (let ((ancestor ".")
4519 (filename-dir (file-name-as-directory filename)))
4520 (while (not
4522 (eq t (compare-strings filename-dir nil (length directory)
4523 directory nil nil fold-case))
4524 (eq t (compare-strings filename nil (length directory)
4525 directory nil nil fold-case))))
4526 (setq directory (file-name-directory (substring directory 0 -1))
4527 ancestor (if (equal ancestor ".")
4528 ".."
4529 (concat "../" ancestor))))
4530 ;; Now ancestor is empty, or .., or ../.., etc.
4531 (if (eq t (compare-strings filename nil (length directory)
4532 directory nil nil fold-case))
4533 ;; We matched within FILENAME's directory part.
4534 ;; Add the rest of FILENAME onto ANCESTOR.
4535 (let ((rest (substring filename (length directory))))
4536 (if (and (equal ancestor ".") (not (equal rest "")))
4537 ;; But don't bother with ANCESTOR if it would give us `./'.
4538 rest
4539 (concat (file-name-as-directory ancestor) rest)))
4540 ;; We matched FILENAME's directory equivalent.
4541 ancestor))))))
4543 (defun save-buffer (&optional arg)
4544 "Save current buffer in visited file if modified.
4545 Variations are described below.
4547 By default, makes the previous version into a backup file
4548 if previously requested or if this is the first save.
4549 Prefixed with one \\[universal-argument], marks this version
4550 to become a backup when the next save is done.
4551 Prefixed with two \\[universal-argument]'s,
4552 unconditionally makes the previous version into a backup file.
4553 Prefixed with three \\[universal-argument]'s, marks this version
4554 to become a backup when the next save is done,
4555 and unconditionally makes the previous version into a backup file.
4557 With a numeric prefix argument of 0, never make the previous version
4558 into a backup file.
4560 If a file's name is FOO, the names of its numbered backup versions are
4561 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
4562 Numeric backups (rather than FOO~) will be made if value of
4563 `version-control' is not the atom `never' and either there are already
4564 numeric versions of the file being backed up, or `version-control' is
4565 non-nil.
4566 We don't want excessive versions piling up, so there are variables
4567 `kept-old-versions', which tells Emacs how many oldest versions to keep,
4568 and `kept-new-versions', which tells how many newest versions to keep.
4569 Defaults are 2 old versions and 2 new.
4570 `dired-kept-versions' controls dired's clean-directory (.) command.
4571 If `delete-old-versions' is nil, system will query user
4572 before trimming versions. Otherwise it does it silently.
4574 If `vc-make-backup-files' is nil, which is the default,
4575 no backup files are made for files managed by version control.
4576 (This is because the version control system itself records previous versions.)
4578 See the subroutine `basic-save-buffer' for more information."
4579 (interactive "p")
4580 (let ((modp (buffer-modified-p))
4581 (make-backup-files (or (and make-backup-files (not (eq arg 0)))
4582 (memq arg '(16 64)))))
4583 (and modp (memq arg '(16 64)) (setq buffer-backed-up nil))
4584 ;; We used to display the message below only for files > 50KB, but
4585 ;; then Rmail-mbox never displays it due to buffer swapping. If
4586 ;; the test is ever re-introduced, be sure to handle saving of
4587 ;; Rmail files.
4588 (if (and modp (buffer-file-name))
4589 (message "Saving file %s..." (buffer-file-name)))
4590 (basic-save-buffer)
4591 (and modp (memq arg '(4 64)) (setq buffer-backed-up nil))))
4593 (defun delete-auto-save-file-if-necessary (&optional force)
4594 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
4595 Normally delete only if the file was written by this Emacs since
4596 the last real save, but optional arg FORCE non-nil means delete anyway."
4597 (and buffer-auto-save-file-name delete-auto-save-files
4598 (not (string= buffer-file-name buffer-auto-save-file-name))
4599 (or force (recent-auto-save-p))
4600 (progn
4601 (condition-case ()
4602 (delete-file buffer-auto-save-file-name)
4603 (file-error nil))
4604 (set-buffer-auto-saved))))
4606 (defvar auto-save-hook nil
4607 "Normal hook run just before auto-saving.")
4609 (defcustom before-save-hook nil
4610 "Normal hook that is run before a buffer is saved to its file."
4611 :options '(copyright-update time-stamp)
4612 :type 'hook
4613 :group 'files)
4615 (defcustom after-save-hook nil
4616 "Normal hook that is run after a buffer is saved to its file."
4617 :options '(executable-make-buffer-file-executable-if-script-p)
4618 :type 'hook
4619 :group 'files)
4621 (defvar save-buffer-coding-system nil
4622 "If non-nil, use this coding system for saving the buffer.
4623 More precisely, use this coding system in place of the
4624 value of `buffer-file-coding-system', when saving the buffer.
4625 Calling `write-region' for any purpose other than saving the buffer
4626 will still use `buffer-file-coding-system'; this variable has no effect
4627 in such cases.")
4629 (make-variable-buffer-local 'save-buffer-coding-system)
4630 (put 'save-buffer-coding-system 'permanent-local t)
4632 (defun basic-save-buffer ()
4633 "Save the current buffer in its visited file, if it has been modified.
4634 The hooks `write-contents-functions' and `write-file-functions' get a chance
4635 to do the job of saving; if they do not, then the buffer is saved in
4636 the visited file in the usual way.
4637 Before and after saving the buffer, this function runs
4638 `before-save-hook' and `after-save-hook', respectively."
4639 (interactive)
4640 (save-current-buffer
4641 ;; In an indirect buffer, save its base buffer instead.
4642 (if (buffer-base-buffer)
4643 (set-buffer (buffer-base-buffer)))
4644 (if (or (buffer-modified-p)
4645 ;; handle the case when no modification has been made but
4646 ;; the file disappeared since visited
4647 (and buffer-file-name
4648 (not (file-exists-p buffer-file-name))))
4649 (let ((recent-save (recent-auto-save-p))
4650 setmodes)
4651 ;; If buffer has no file name, ask user for one.
4652 (or buffer-file-name
4653 (let ((filename
4654 (expand-file-name
4655 (read-file-name "File to save in: "
4656 nil (expand-file-name (buffer-name))))))
4657 (if (file-exists-p filename)
4658 (if (file-directory-p filename)
4659 ;; Signal an error if the user specified the name of an
4660 ;; existing directory.
4661 (error "%s is a directory" filename)
4662 (unless (y-or-n-p (format "File `%s' exists; overwrite? "
4663 filename))
4664 (error "Canceled"))))
4665 (set-visited-file-name filename)))
4666 (or (verify-visited-file-modtime (current-buffer))
4667 (not (file-exists-p buffer-file-name))
4668 (yes-or-no-p
4669 (format
4670 "%s has changed since visited or saved. Save anyway? "
4671 (file-name-nondirectory buffer-file-name)))
4672 (user-error "Save not confirmed"))
4673 (save-restriction
4674 (widen)
4675 (save-excursion
4676 (and (> (point-max) (point-min))
4677 (not find-file-literally)
4678 (/= (char-after (1- (point-max))) ?\n)
4679 (not (and (eq selective-display t)
4680 (= (char-after (1- (point-max))) ?\r)))
4681 (or (eq require-final-newline t)
4682 (eq require-final-newline 'visit-save)
4683 (and require-final-newline
4684 (y-or-n-p
4685 (format "Buffer %s does not end in newline. Add one? "
4686 (buffer-name)))))
4687 (save-excursion
4688 (goto-char (point-max))
4689 (insert ?\n))))
4690 ;; Support VC version backups.
4691 (vc-before-save)
4692 ;; Don't let errors prevent saving the buffer.
4693 (with-demoted-errors (run-hooks 'before-save-hook))
4694 (or (run-hook-with-args-until-success 'write-contents-functions)
4695 (run-hook-with-args-until-success 'local-write-file-hooks)
4696 (run-hook-with-args-until-success 'write-file-functions)
4697 ;; If a hook returned t, file is already "written".
4698 ;; Otherwise, write it the usual way now.
4699 (let ((dir (file-name-directory
4700 (expand-file-name buffer-file-name))))
4701 (unless (file-exists-p dir)
4702 (if (y-or-n-p
4703 (format "Directory `%s' does not exist; create? " dir))
4704 (make-directory dir t)
4705 (error "Canceled")))
4706 (setq setmodes (basic-save-buffer-1))))
4707 ;; Now we have saved the current buffer. Let's make sure
4708 ;; that buffer-file-coding-system is fixed to what
4709 ;; actually used for saving by binding it locally.
4710 (if save-buffer-coding-system
4711 (setq save-buffer-coding-system last-coding-system-used)
4712 (setq buffer-file-coding-system last-coding-system-used))
4713 (setq buffer-file-number
4714 (nthcdr 10 (file-attributes buffer-file-name)))
4715 (if setmodes
4716 (condition-case ()
4717 (progn
4718 (unless
4719 (with-demoted-errors
4720 (set-file-modes buffer-file-name (car setmodes)))
4721 (set-file-extended-attributes buffer-file-name
4722 (nth 1 setmodes))))
4723 (error nil))))
4724 ;; If the auto-save file was recent before this command,
4725 ;; delete it now.
4726 (delete-auto-save-file-if-necessary recent-save)
4727 ;; Support VC `implicit' locking.
4728 (vc-after-save)
4729 (run-hooks 'after-save-hook))
4730 (message "(No changes need to be saved)"))))
4732 ;; This does the "real job" of writing a buffer into its visited file
4733 ;; and making a backup file. This is what is normally done
4734 ;; but inhibited if one of write-file-functions returns non-nil.
4735 ;; It returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4736 ;; backup-buffer.
4737 (defun basic-save-buffer-1 ()
4738 (prog1
4739 (if save-buffer-coding-system
4740 (let ((coding-system-for-write save-buffer-coding-system))
4741 (basic-save-buffer-2))
4742 (basic-save-buffer-2))
4743 (if buffer-file-coding-system-explicit
4744 (setcar buffer-file-coding-system-explicit last-coding-system-used))))
4746 ;; This returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4747 ;; backup-buffer.
4748 (defun basic-save-buffer-2 ()
4749 (let (tempsetmodes setmodes writecoding)
4750 (if (not (file-writable-p buffer-file-name))
4751 (let ((dir (file-name-directory buffer-file-name)))
4752 (if (not (file-directory-p dir))
4753 (if (file-exists-p dir)
4754 (error "%s is not a directory" dir)
4755 (error "%s: no such directory" dir))
4756 (if (not (file-exists-p buffer-file-name))
4757 (error "Directory %s write-protected" dir)
4758 (if (yes-or-no-p
4759 (format
4760 "File %s is write-protected; try to save anyway? "
4761 (file-name-nondirectory
4762 buffer-file-name)))
4763 (setq tempsetmodes t)
4764 (error "Attempt to save to a file which you aren't allowed to write"))))))
4765 ;; This may involve prompting, so do it now before backing up the file.
4766 ;; Otherwise there can be a delay while the user answers the
4767 ;; prompt during which the original file has been renamed. (Bug#13522)
4768 (setq writecoding
4769 ;; Args here should match write-region call below around
4770 ;; which we use writecoding.
4771 (choose-write-coding-system nil nil buffer-file-name nil t
4772 buffer-file-truename))
4773 (or buffer-backed-up
4774 (setq setmodes (backup-buffer)))
4775 (let* ((dir (file-name-directory buffer-file-name))
4776 (dir-writable (file-writable-p dir)))
4777 (if (or (and file-precious-flag dir-writable)
4778 (and break-hardlink-on-save
4779 (file-exists-p buffer-file-name)
4780 (> (file-nlinks buffer-file-name) 1)
4781 (or dir-writable
4782 (error (concat (format
4783 "Directory %s write-protected; " dir)
4784 "cannot break hardlink when saving")))))
4785 ;; Write temp name, then rename it.
4786 ;; This requires write access to the containing dir,
4787 ;; which is why we don't try it if we don't have that access.
4788 (let ((realname buffer-file-name)
4789 tempname succeed
4790 (umask (default-file-modes))
4791 (old-modtime (visited-file-modtime)))
4792 ;; Create temp files with strict access rights. It's easy to
4793 ;; loosen them later, whereas it's impossible to close the
4794 ;; time-window of loose permissions otherwise.
4795 (unwind-protect
4796 (progn
4797 (clear-visited-file-modtime)
4798 (set-default-file-modes ?\700)
4799 ;; Try various temporary names.
4800 ;; This code follows the example of make-temp-file,
4801 ;; but it calls write-region in the appropriate way
4802 ;; for saving the buffer.
4803 (while (condition-case ()
4804 (progn
4805 (setq tempname
4806 (make-temp-name
4807 (expand-file-name "tmp" dir)))
4808 ;; Pass in nil&nil rather than point-min&max
4809 ;; cause we're saving the whole buffer.
4810 ;; write-region-annotate-functions may use it.
4811 (write-region nil nil
4812 tempname nil realname
4813 buffer-file-truename 'excl)
4814 nil)
4815 (file-already-exists t))
4816 ;; The file was somehow created by someone else between
4817 ;; `make-temp-name' and `write-region', let's try again.
4818 nil)
4819 (setq succeed t))
4820 ;; Reset the umask.
4821 (set-default-file-modes umask)
4822 ;; If we failed, restore the buffer's modtime.
4823 (unless succeed
4824 (set-visited-file-modtime old-modtime)))
4825 ;; Since we have created an entirely new file,
4826 ;; make sure it gets the right permission bits set.
4827 (setq setmodes (or setmodes
4828 (list (or (file-modes buffer-file-name)
4829 (logand ?\666 umask))
4830 (file-extended-attributes buffer-file-name)
4831 buffer-file-name)))
4832 ;; We succeeded in writing the temp file,
4833 ;; so rename it.
4834 (rename-file tempname buffer-file-name t))
4835 ;; If file not writable, see if we can make it writable
4836 ;; temporarily while we write it.
4837 ;; But no need to do so if we have just backed it up
4838 ;; (setmodes is set) because that says we're superseding.
4839 (cond ((and tempsetmodes (not setmodes))
4840 ;; Change the mode back, after writing.
4841 (setq setmodes (list (file-modes buffer-file-name)
4842 (file-extended-attributes buffer-file-name)
4843 buffer-file-name))
4844 ;; If set-file-extended-attributes fails, fall back on
4845 ;; set-file-modes.
4846 (unless
4847 (with-demoted-errors
4848 (set-file-extended-attributes buffer-file-name
4849 (nth 1 setmodes)))
4850 (set-file-modes buffer-file-name
4851 (logior (car setmodes) 128))))))
4852 (let (success)
4853 (unwind-protect
4854 ;; Pass in nil&nil rather than point-min&max to indicate
4855 ;; we're saving the buffer rather than just a region.
4856 ;; write-region-annotate-functions may make us of it.
4857 (let ((coding-system-for-write writecoding)
4858 (coding-system-require-warning nil))
4859 (write-region nil nil
4860 buffer-file-name nil t buffer-file-truename)
4861 (setq success t))
4862 ;; If we get an error writing the new file, and we made
4863 ;; the backup by renaming, undo the backing-up.
4864 (and setmodes (not success)
4865 (progn
4866 (rename-file (nth 2 setmodes) buffer-file-name t)
4867 (setq buffer-backed-up nil))))))
4868 setmodes))
4870 (declare-function diff-no-select "diff"
4871 (old new &optional switches no-async buf))
4873 (defvar save-some-buffers-action-alist
4874 `((?\C-r
4875 ,(lambda (buf)
4876 (if (not enable-recursive-minibuffers)
4877 (progn (display-buffer buf)
4878 (setq other-window-scroll-buffer buf))
4879 (view-buffer buf (lambda (_) (exit-recursive-edit)))
4880 (recursive-edit))
4881 ;; Return nil to ask about BUF again.
4882 nil)
4883 ,(purecopy "view this buffer"))
4884 (?d ,(lambda (buf)
4885 (if (null (buffer-file-name buf))
4886 (message "Not applicable: no file")
4887 (require 'diff) ;for diff-no-select.
4888 (let ((diffbuf (diff-no-select (buffer-file-name buf) buf
4889 nil 'noasync)))
4890 (if (not enable-recursive-minibuffers)
4891 (progn (display-buffer diffbuf)
4892 (setq other-window-scroll-buffer diffbuf))
4893 (view-buffer diffbuf (lambda (_) (exit-recursive-edit)))
4894 (recursive-edit))))
4895 ;; Return nil to ask about BUF again.
4896 nil)
4897 ,(purecopy "view changes in this buffer")))
4898 "ACTION-ALIST argument used in call to `map-y-or-n-p'.")
4899 (put 'save-some-buffers-action-alist 'risky-local-variable t)
4901 (defvar buffer-save-without-query nil
4902 "Non-nil means `save-some-buffers' should save this buffer without asking.")
4903 (make-variable-buffer-local 'buffer-save-without-query)
4905 (defun save-some-buffers (&optional arg pred)
4906 "Save some modified file-visiting buffers. Asks user about each one.
4907 You can answer `y' to save, `n' not to save, `C-r' to look at the
4908 buffer in question with `view-buffer' before deciding or `d' to
4909 view the differences using `diff-buffer-with-file'.
4911 This command first saves any buffers where `buffer-save-without-query' is
4912 non-nil, without asking.
4914 Optional argument (the prefix) non-nil means save all with no questions.
4915 Optional second argument PRED determines which buffers are considered:
4916 If PRED is nil, all the file-visiting buffers are considered.
4917 If PRED is t, then certain non-file buffers will also be considered.
4918 If PRED is a zero-argument function, it indicates for each buffer whether
4919 to consider it or not when called with that buffer current.
4921 See `save-some-buffers-action-alist' if you want to
4922 change the additional actions you can take on files."
4923 (interactive "P")
4924 (save-window-excursion
4925 (let* (queried autosaved-buffers
4926 files-done abbrevs-done)
4927 (dolist (buffer (buffer-list))
4928 ;; First save any buffers that we're supposed to save unconditionally.
4929 ;; That way the following code won't ask about them.
4930 (with-current-buffer buffer
4931 (when (and buffer-save-without-query (buffer-modified-p))
4932 (push (buffer-name) autosaved-buffers)
4933 (save-buffer))))
4934 ;; Ask about those buffers that merit it,
4935 ;; and record the number thus saved.
4936 (setq files-done
4937 (map-y-or-n-p
4938 (lambda (buffer)
4939 ;; Note that killing some buffers may kill others via
4940 ;; hooks (e.g. Rmail and its viewing buffer).
4941 (and (buffer-live-p buffer)
4942 (buffer-modified-p buffer)
4943 (not (buffer-base-buffer buffer))
4945 (buffer-file-name buffer)
4946 (and pred
4947 (progn
4948 (set-buffer buffer)
4949 (and buffer-offer-save (> (buffer-size) 0)))))
4950 (or (not (functionp pred))
4951 (with-current-buffer buffer (funcall pred)))
4952 (if arg
4954 (setq queried t)
4955 (if (buffer-file-name buffer)
4956 (format "Save file %s? "
4957 (buffer-file-name buffer))
4958 (format "Save buffer %s? "
4959 (buffer-name buffer))))))
4960 (lambda (buffer)
4961 (with-current-buffer buffer
4962 (save-buffer)))
4963 (buffer-list)
4964 '("buffer" "buffers" "save")
4965 save-some-buffers-action-alist))
4966 ;; Maybe to save abbrevs, and record whether
4967 ;; we either saved them or asked to.
4968 (and save-abbrevs abbrevs-changed
4969 (progn
4970 (if (or arg
4971 (eq save-abbrevs 'silently)
4972 (y-or-n-p (format "Save abbrevs in %s? " abbrev-file-name)))
4973 (write-abbrev-file nil))
4974 ;; Don't keep bothering user if he says no.
4975 (setq abbrevs-changed nil)
4976 (setq abbrevs-done t)))
4977 (or queried (> files-done 0) abbrevs-done
4978 (cond
4979 ((null autosaved-buffers)
4980 (message "(No files need saving)"))
4981 ((= (length autosaved-buffers) 1)
4982 (message "(Saved %s)" (car autosaved-buffers)))
4984 (message "(Saved %d files: %s)"
4985 (length autosaved-buffers)
4986 (mapconcat 'identity autosaved-buffers ", "))))))))
4988 (defun clear-visited-file-modtime ()
4989 "Clear out records of last mod time of visited file.
4990 Next attempt to save will certainly not complain of a discrepancy."
4991 (set-visited-file-modtime 0))
4993 (defun not-modified (&optional arg)
4994 "Mark current buffer as unmodified, not needing to be saved.
4995 With prefix ARG, mark buffer as modified, so \\[save-buffer] will save.
4997 It is not a good idea to use this function in Lisp programs, because it
4998 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
4999 (declare (interactive-only set-buffer-modified-p))
5000 (interactive "P")
5001 (message (if arg "Modification-flag set"
5002 "Modification-flag cleared"))
5003 (set-buffer-modified-p arg))
5005 (defun toggle-read-only (&optional arg interactive)
5006 (declare (obsolete read-only-mode "24.3"))
5007 (interactive (list current-prefix-arg t))
5008 (if interactive
5009 (call-interactively 'read-only-mode)
5010 (read-only-mode (or arg 'toggle))))
5012 (defun insert-file (filename)
5013 "Insert contents of file FILENAME into buffer after point.
5014 Set mark after the inserted text.
5016 This function is meant for the user to run interactively.
5017 Don't call it from programs! Use `insert-file-contents' instead.
5018 \(Its calling sequence is different; see its documentation)."
5019 (declare (interactive-only insert-file-contents))
5020 (interactive "*fInsert file: ")
5021 (insert-file-1 filename #'insert-file-contents))
5023 (defun append-to-file (start end filename)
5024 "Append the contents of the region to the end of file FILENAME.
5025 When called from a function, expects three arguments,
5026 START, END and FILENAME. START and END are normally buffer positions
5027 specifying the part of the buffer to write.
5028 If START is nil, that means to use the entire buffer contents.
5029 If START is a string, then output that string to the file
5030 instead of any buffer contents; END is ignored.
5032 This does character code conversion and applies annotations
5033 like `write-region' does."
5034 (interactive "r\nFAppend to file: ")
5035 (write-region start end filename t))
5037 (defun file-newest-backup (filename)
5038 "Return most recent backup file for FILENAME or nil if no backups exist."
5039 ;; `make-backup-file-name' will get us the right directory for
5040 ;; ordinary or numeric backups. It might create a directory for
5041 ;; backups as a side-effect, according to `backup-directory-alist'.
5042 (let* ((filename (file-name-sans-versions
5043 (make-backup-file-name (expand-file-name filename))))
5044 (file (file-name-nondirectory filename))
5045 (dir (file-name-directory filename))
5046 (comp (file-name-all-completions file dir))
5047 (newest nil)
5048 tem)
5049 (while comp
5050 (setq tem (pop comp))
5051 (cond ((and (backup-file-name-p tem)
5052 (string= (file-name-sans-versions tem) file))
5053 (setq tem (concat dir tem))
5054 (if (or (null newest)
5055 (file-newer-than-file-p tem newest))
5056 (setq newest tem)))))
5057 newest))
5059 (defun rename-uniquely ()
5060 "Rename current buffer to a similar name not already taken.
5061 This function is useful for creating multiple shell process buffers
5062 or multiple mail buffers, etc.
5064 Note that some commands, in particular those based on `compilation-mode'
5065 \(`compile', `grep', etc.) will reuse the current buffer if it has the
5066 appropriate mode even if it has been renamed. So as well as renaming
5067 the buffer, you also need to switch buffers before running another
5068 instance of such commands."
5069 (interactive)
5070 (save-match-data
5071 (let ((base-name (buffer-name)))
5072 (and (string-match "<[0-9]+>\\'" base-name)
5073 (not (and buffer-file-name
5074 (string= base-name
5075 (file-name-nondirectory buffer-file-name))))
5076 ;; If the existing buffer name has a <NNN>,
5077 ;; which isn't part of the file name (if any),
5078 ;; then get rid of that.
5079 (setq base-name (substring base-name 0 (match-beginning 0))))
5080 (rename-buffer (generate-new-buffer-name base-name))
5081 (force-mode-line-update))))
5083 (defun make-directory (dir &optional parents)
5084 "Create the directory DIR and optionally any nonexistent parent dirs.
5085 If DIR already exists as a directory, signal an error, unless
5086 PARENTS is non-nil.
5088 Interactively, the default choice of directory to create is the
5089 current buffer's default directory. That is useful when you have
5090 visited a file in a nonexistent directory.
5092 Noninteractively, the second (optional) argument PARENTS, if
5093 non-nil, says whether to create parent directories that don't
5094 exist. Interactively, this happens by default.
5096 If creating the directory or directories fail, an error will be
5097 raised."
5098 (interactive
5099 (list (read-file-name "Make directory: " default-directory default-directory
5100 nil nil)
5102 ;; If default-directory is a remote directory,
5103 ;; make sure we find its make-directory handler.
5104 (setq dir (expand-file-name dir))
5105 (let ((handler (find-file-name-handler dir 'make-directory)))
5106 (if handler
5107 (funcall handler 'make-directory dir parents)
5108 (if (not parents)
5109 (make-directory-internal dir)
5110 (let ((dir (directory-file-name (expand-file-name dir)))
5111 create-list)
5112 (while (and (not (file-exists-p dir))
5113 ;; If directory is its own parent, then we can't
5114 ;; keep looping forever
5115 (not (equal dir
5116 (directory-file-name
5117 (file-name-directory dir)))))
5118 (setq create-list (cons dir create-list)
5119 dir (directory-file-name (file-name-directory dir))))
5120 (while create-list
5121 (make-directory-internal (car create-list))
5122 (setq create-list (cdr create-list))))))))
5124 (defconst directory-files-no-dot-files-regexp
5125 "^\\([^.]\\|\\.\\([^.]\\|\\..\\)\\).*"
5126 "Regexp matching any file name except \".\" and \"..\".")
5128 (defun delete-directory (directory &optional recursive trash)
5129 "Delete the directory named DIRECTORY. Does not follow symlinks.
5130 If RECURSIVE is non-nil, all files in DIRECTORY are deleted as well.
5131 TRASH non-nil means to trash the directory instead, provided
5132 `delete-by-moving-to-trash' is non-nil.
5134 When called interactively, TRASH is t if no prefix argument is
5135 given. With a prefix argument, TRASH is nil."
5136 (interactive
5137 (let* ((trashing (and delete-by-moving-to-trash
5138 (null current-prefix-arg)))
5139 (dir (expand-file-name
5140 (read-directory-name
5141 (if trashing
5142 "Move directory to trash: "
5143 "Delete directory: ")
5144 default-directory default-directory nil nil))))
5145 (list dir
5146 (if (directory-files dir nil directory-files-no-dot-files-regexp)
5147 (y-or-n-p
5148 (format "Directory `%s' is not empty, really %s? "
5149 dir (if trashing "trash" "delete")))
5150 nil)
5151 (null current-prefix-arg))))
5152 ;; If default-directory is a remote directory, make sure we find its
5153 ;; delete-directory handler.
5154 (setq directory (directory-file-name (expand-file-name directory)))
5155 (let ((handler (find-file-name-handler directory 'delete-directory)))
5156 (cond
5157 (handler
5158 (funcall handler 'delete-directory directory recursive))
5159 ((and delete-by-moving-to-trash trash)
5160 ;; Only move non-empty dir to trash if recursive deletion was
5161 ;; requested. This mimics the non-`delete-by-moving-to-trash'
5162 ;; case, where the operation fails in delete-directory-internal.
5163 ;; As `move-file-to-trash' trashes directories (empty or
5164 ;; otherwise) as a unit, we do not need to recurse here.
5165 (if (and (not recursive)
5166 ;; Check if directory is empty apart from "." and "..".
5167 (directory-files
5168 directory 'full directory-files-no-dot-files-regexp))
5169 (error "Directory is not empty, not moving to trash")
5170 (move-file-to-trash directory)))
5171 ;; Otherwise, call ourselves recursively if needed.
5173 (if (and recursive (not (file-symlink-p directory)))
5174 (mapc (lambda (file)
5175 ;; This test is equivalent to
5176 ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
5177 ;; but more efficient
5178 (if (eq t (car (file-attributes file)))
5179 (delete-directory file recursive nil)
5180 (delete-file file nil)))
5181 ;; We do not want to delete "." and "..".
5182 (directory-files
5183 directory 'full directory-files-no-dot-files-regexp)))
5184 (delete-directory-internal directory)))))
5186 (defun file-equal-p (file1 file2)
5187 "Return non-nil if files FILE1 and FILE2 name the same file.
5188 If FILE1 or FILE2 does not exist, the return value is unspecified."
5189 (let ((handler (or (find-file-name-handler file1 'file-equal-p)
5190 (find-file-name-handler file2 'file-equal-p))))
5191 (if handler
5192 (funcall handler 'file-equal-p file1 file2)
5193 (let (f1-attr f2-attr)
5194 (and (setq f1-attr (file-attributes (file-truename file1)))
5195 (setq f2-attr (file-attributes (file-truename file2)))
5196 (equal f1-attr f2-attr))))))
5198 (defun file-in-directory-p (file dir)
5199 "Return non-nil if FILE is in DIR or a subdirectory of DIR.
5200 A directory is considered to be \"in\" itself.
5201 Return nil if DIR is not an existing directory."
5202 (let ((handler (or (find-file-name-handler file 'file-in-directory-p)
5203 (find-file-name-handler dir 'file-in-directory-p))))
5204 (if handler
5205 (funcall handler 'file-in-directory-p file dir)
5206 (when (file-directory-p dir) ; DIR must exist.
5207 (setq file (file-truename file)
5208 dir (file-truename dir))
5209 (let ((ls1 (split-string file "/" t))
5210 (ls2 (split-string dir "/" t))
5211 (root (if (string-match "\\`/" file) "/" ""))
5212 (mismatch nil))
5213 (while (and ls1 ls2 (not mismatch))
5214 (if (string-equal (car ls1) (car ls2))
5215 (setq root (concat root (car ls1) "/"))
5216 (setq mismatch t))
5217 (setq ls1 (cdr ls1)
5218 ls2 (cdr ls2)))
5219 (unless mismatch
5220 (file-equal-p root dir)))))))
5222 (defun copy-directory (directory newname &optional keep-time parents copy-contents)
5223 "Copy DIRECTORY to NEWNAME. Both args must be strings.
5224 This function always sets the file modes of the output files to match
5225 the corresponding input file.
5227 The third arg KEEP-TIME non-nil means give the output files the same
5228 last-modified time as the old ones. (This works on only some systems.)
5230 A prefix arg makes KEEP-TIME non-nil.
5232 Noninteractively, the last argument PARENTS says whether to
5233 create parent directories if they don't exist. Interactively,
5234 this happens by default.
5236 If NEWNAME names an existing directory, copy DIRECTORY as a
5237 subdirectory there. However, if called from Lisp with a non-nil
5238 optional argument COPY-CONTENTS, copy the contents of DIRECTORY
5239 directly into NEWNAME instead."
5240 (interactive
5241 (let ((dir (read-directory-name
5242 "Copy directory: " default-directory default-directory t nil)))
5243 (list dir
5244 (read-directory-name
5245 (format "Copy directory %s to: " dir)
5246 default-directory default-directory nil nil)
5247 current-prefix-arg t nil)))
5248 (when (file-in-directory-p newname directory)
5249 (error "Cannot copy `%s' into its subdirectory `%s'"
5250 directory newname))
5251 ;; If default-directory is a remote directory, make sure we find its
5252 ;; copy-directory handler.
5253 (let ((handler (or (find-file-name-handler directory 'copy-directory)
5254 (find-file-name-handler newname 'copy-directory))))
5255 (if handler
5256 (funcall handler 'copy-directory directory
5257 newname keep-time parents copy-contents)
5259 ;; Compute target name.
5260 (setq directory (directory-file-name (expand-file-name directory))
5261 newname (directory-file-name (expand-file-name newname)))
5263 (cond ((not (file-directory-p newname))
5264 ;; If NEWNAME is not an existing directory, create it;
5265 ;; that is where we will copy the files of DIRECTORY.
5266 (make-directory newname parents))
5267 ;; If NEWNAME is an existing directory and COPY-CONTENTS
5268 ;; is nil, copy into NEWNAME/[DIRECTORY-BASENAME].
5269 ((not copy-contents)
5270 (setq newname (expand-file-name
5271 (file-name-nondirectory
5272 (directory-file-name directory))
5273 newname))
5274 (and (file-exists-p newname)
5275 (not (file-directory-p newname))
5276 (error "Cannot overwrite non-directory %s with a directory"
5277 newname))
5278 (make-directory newname t)))
5280 ;; Copy recursively.
5281 (dolist (file
5282 ;; We do not want to copy "." and "..".
5283 (directory-files directory 'full
5284 directory-files-no-dot-files-regexp))
5285 (let ((target (expand-file-name (file-name-nondirectory file) newname))
5286 (filetype (car (file-attributes file))))
5287 (cond
5288 ((eq filetype t) ; Directory but not a symlink.
5289 (copy-directory file newname keep-time parents))
5290 ((stringp filetype) ; Symbolic link
5291 (make-symbolic-link filetype target t))
5292 ((copy-file file target t keep-time)))))
5294 ;; Set directory attributes.
5295 (let ((modes (file-modes directory))
5296 (times (and keep-time (nth 5 (file-attributes directory)))))
5297 (if modes (set-file-modes newname modes))
5298 (if times (set-file-times newname times))))))
5301 ;; At time of writing, only info uses this.
5302 (defun prune-directory-list (dirs &optional keep reject)
5303 "Return a copy of DIRS with all non-existent directories removed.
5304 The optional argument KEEP is a list of directories to retain even if
5305 they don't exist, and REJECT is a list of directories to remove from
5306 DIRS, even if they exist; REJECT takes precedence over KEEP.
5308 Note that membership in REJECT and KEEP is checked using simple string
5309 comparison."
5310 (apply #'nconc
5311 (mapcar (lambda (dir)
5312 (and (not (member dir reject))
5313 (or (member dir keep) (file-directory-p dir))
5314 (list dir)))
5315 dirs)))
5318 (put 'revert-buffer-function 'permanent-local t)
5319 (defvar revert-buffer-function #'revert-buffer--default
5320 "Function to use to revert this buffer.
5321 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
5322 which are the arguments that `revert-buffer' received.
5323 It also has access to the `preserve-modes' argument of `revert-buffer'
5324 via the `revert-buffer-preserve-modes' dynamic variable.
5326 For historical reasons, a value of nil means to use the default function.
5327 This should not be relied upon.")
5329 (put 'revert-buffer-insert-file-contents-function 'permanent-local t)
5330 (defvar revert-buffer-insert-file-contents-function
5331 #'revert-buffer-insert-file-contents--default-function
5332 "Function to use to insert contents when reverting this buffer.
5333 The function receives two arguments: the first the nominal file name to use;
5334 the second is t if reading the auto-save file.
5336 The function is responsible for updating (or preserving) point.
5338 For historical reasons, a value of nil means to use the default function.
5339 This should not be relied upon.")
5341 (defun buffer-stale--default-function (&optional _noconfirm)
5342 "Default function to use for `buffer-stale-function'.
5343 This function ignores its argument.
5344 This returns non-nil if the current buffer is visiting a readable file
5345 whose modification time does not match that of the buffer.
5347 This function only handles buffers that are visiting files.
5348 Non-file buffers need a custom function"
5349 (and buffer-file-name
5350 (file-readable-p buffer-file-name)
5351 (not (verify-visited-file-modtime (current-buffer)))))
5353 (defvar buffer-stale-function #'buffer-stale--default-function
5354 "Function to check whether a buffer needs reverting.
5355 This should be a function with one optional argument NOCONFIRM.
5356 Auto Revert Mode passes t for NOCONFIRM. The function should return
5357 non-nil if the buffer should be reverted. A return value of
5358 `fast' means that the need for reverting was not checked, but
5359 that reverting the buffer is fast. The buffer is current when
5360 this function is called.
5362 The idea behind the NOCONFIRM argument is that it should be
5363 non-nil if the buffer is going to be reverted without asking the
5364 user. In such situations, one has to be careful with potentially
5365 time consuming operations.
5367 For historical reasons, a value of nil means to use the default function.
5368 This should not be relied upon.
5370 For more information on how this variable is used by Auto Revert mode,
5371 see Info node `(emacs)Supporting additional buffers'.")
5373 (defvar before-revert-hook nil
5374 "Normal hook for `revert-buffer' to run before reverting.
5375 The function `revert-buffer--default' runs this.
5376 A customized `revert-buffer-function' need not run this hook.")
5378 (defvar after-revert-hook nil
5379 "Normal hook for `revert-buffer' to run after reverting.
5380 Note that the hook value that it runs is the value that was in effect
5381 before reverting; that makes a difference if you have buffer-local
5382 hook functions.
5384 The function `revert-buffer--default' runs this.
5385 A customized `revert-buffer-function' need not run this hook.")
5387 (defvar revert-buffer-in-progress-p nil
5388 "Non-nil if a `revert-buffer' operation is in progress, nil otherwise.")
5390 (defvar revert-buffer-internal-hook)
5392 ;; `revert-buffer-function' was defined long ago to be a function of only
5393 ;; 2 arguments, so we have to use a dynbind variable to pass the
5394 ;; `preserve-modes' argument of `revert-buffer'.
5395 (defvar revert-buffer-preserve-modes)
5397 (defun revert-buffer (&optional ignore-auto noconfirm preserve-modes)
5398 "Replace current buffer text with the text of the visited file on disk.
5399 This undoes all changes since the file was visited or saved.
5400 With a prefix argument, offer to revert from latest auto-save file, if
5401 that is more recent than the visited file.
5403 This command also implements an interface for special buffers
5404 that contain text which doesn't come from a file, but reflects
5405 some other data instead (e.g. Dired buffers, `buffer-list'
5406 buffers). This is done via the variable `revert-buffer-function'.
5407 In these cases, it should reconstruct the buffer contents from the
5408 appropriate data.
5410 When called from Lisp, the first argument is IGNORE-AUTO; only offer
5411 to revert from the auto-save file when this is nil. Note that the
5412 sense of this argument is the reverse of the prefix argument, for the
5413 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
5414 to nil.
5416 Optional second argument NOCONFIRM means don't ask for confirmation
5417 at all. (The variable `revert-without-query' offers another way to
5418 revert buffers without querying for confirmation.)
5420 Optional third argument PRESERVE-MODES non-nil means don't alter
5421 the files modes. Normally we reinitialize them using `normal-mode'.
5423 This function binds `revert-buffer-in-progress-p' non-nil while it operates.
5425 This function calls the function that `revert-buffer-function' specifies
5426 to do the work, with arguments IGNORE-AUTO and NOCONFIRM.
5427 The default function runs the hooks `before-revert-hook' and
5428 `after-revert-hook'."
5429 ;; I admit it's odd to reverse the sense of the prefix argument, but
5430 ;; there is a lot of code out there which assumes that the first
5431 ;; argument should be t to avoid consulting the auto-save file, and
5432 ;; there's no straightforward way to encourage authors to notice a
5433 ;; reversal of the argument sense. So I'm just changing the user
5434 ;; interface, but leaving the programmatic interface the same.
5435 (interactive (list (not current-prefix-arg)))
5436 (let ((revert-buffer-in-progress-p t)
5437 (revert-buffer-preserve-modes preserve-modes))
5438 (funcall (or revert-buffer-function #'revert-buffer--default)
5439 ignore-auto noconfirm)))
5441 (defun revert-buffer--default (ignore-auto noconfirm)
5442 "Default function for `revert-buffer'.
5443 The arguments IGNORE-AUTO and NOCONFIRM are as described for `revert-buffer'.
5444 Runs the hooks `before-revert-hook' and `after-revert-hook' at the
5445 start and end.
5447 Calls `revert-buffer-insert-file-contents-function' to reread the
5448 contents of the visited file, with two arguments: the first is the file
5449 name, the second is non-nil if reading an auto-save file.
5451 This function only handles buffers that are visiting files.
5452 Non-file buffers need a custom function."
5453 (with-current-buffer (or (buffer-base-buffer (current-buffer))
5454 (current-buffer))
5455 (let* ((auto-save-p (and (not ignore-auto)
5456 (recent-auto-save-p)
5457 buffer-auto-save-file-name
5458 (file-readable-p buffer-auto-save-file-name)
5459 (y-or-n-p
5460 "Buffer has been auto-saved recently. Revert from auto-save file? ")))
5461 (file-name (if auto-save-p
5462 buffer-auto-save-file-name
5463 buffer-file-name)))
5464 (cond ((null file-name)
5465 (error "Buffer does not seem to be associated with any file"))
5466 ((or noconfirm
5467 (and (not (buffer-modified-p))
5468 (catch 'found
5469 (dolist (regexp revert-without-query)
5470 (when (string-match regexp file-name)
5471 (throw 'found t)))))
5472 (yes-or-no-p (format "Revert buffer from file %s? "
5473 file-name)))
5474 (run-hooks 'before-revert-hook)
5475 ;; If file was backed up but has changed since,
5476 ;; we should make another backup.
5477 (and (not auto-save-p)
5478 (not (verify-visited-file-modtime (current-buffer)))
5479 (setq buffer-backed-up nil))
5480 ;; Effectively copy the after-revert-hook status,
5481 ;; since after-find-file will clobber it.
5482 (let ((global-hook (default-value 'after-revert-hook))
5483 (local-hook (when (local-variable-p 'after-revert-hook)
5484 after-revert-hook))
5485 (inhibit-read-only t))
5486 ;; FIXME: Throw away undo-log when preserve-modes is nil?
5487 (funcall
5488 (or revert-buffer-insert-file-contents-function
5489 #'revert-buffer-insert-file-contents--default-function)
5490 file-name auto-save-p)
5491 ;; Recompute the truename in case changes in symlinks
5492 ;; have changed the truename.
5493 (setq buffer-file-truename
5494 (abbreviate-file-name (file-truename buffer-file-name)))
5495 (after-find-file nil nil t nil revert-buffer-preserve-modes)
5496 ;; Run after-revert-hook as it was before we reverted.
5497 (setq-default revert-buffer-internal-hook global-hook)
5498 (if local-hook
5499 (set (make-local-variable 'revert-buffer-internal-hook)
5500 local-hook)
5501 (kill-local-variable 'revert-buffer-internal-hook))
5502 (run-hooks 'revert-buffer-internal-hook))
5503 t)))))
5505 (defun revert-buffer-insert-file-contents--default-function (file-name auto-save-p)
5506 "Default function for `revert-buffer-insert-file-contents-function'.
5507 The function `revert-buffer--default' calls this.
5508 FILE-NAME is the name of the file. AUTO-SAVE-P is non-nil if this is
5509 an auto-save file."
5510 (cond
5511 ((not (file-exists-p file-name))
5512 (error (if buffer-file-number
5513 "File %s no longer exists!"
5514 "Cannot revert nonexistent file %s")
5515 file-name))
5516 ((not (file-readable-p file-name))
5517 (error (if buffer-file-number
5518 "File %s no longer readable!"
5519 "Cannot revert unreadable file %s")
5520 file-name))
5522 ;; Bind buffer-file-name to nil
5523 ;; so that we don't try to lock the file.
5524 (let ((buffer-file-name nil))
5525 (or auto-save-p
5526 (unlock-buffer)))
5527 (widen)
5528 (let ((coding-system-for-read
5529 ;; Auto-saved file should be read by Emacs's
5530 ;; internal coding.
5531 (if auto-save-p 'auto-save-coding
5532 (or coding-system-for-read
5533 (and
5534 buffer-file-coding-system-explicit
5535 (car buffer-file-coding-system-explicit))))))
5536 (if (and (not enable-multibyte-characters)
5537 coding-system-for-read
5538 (not (memq (coding-system-base
5539 coding-system-for-read)
5540 '(no-conversion raw-text))))
5541 ;; As a coding system suitable for multibyte
5542 ;; buffer is specified, make the current
5543 ;; buffer multibyte.
5544 (set-buffer-multibyte t))
5546 ;; This force after-insert-file-set-coding
5547 ;; (called from insert-file-contents) to set
5548 ;; buffer-file-coding-system to a proper value.
5549 (kill-local-variable 'buffer-file-coding-system)
5551 ;; Note that this preserves point in an intelligent way.
5552 (if revert-buffer-preserve-modes
5553 (let ((buffer-file-format buffer-file-format))
5554 (insert-file-contents file-name (not auto-save-p)
5555 nil nil t))
5556 (insert-file-contents file-name (not auto-save-p)
5557 nil nil t))))))
5559 (defun recover-this-file ()
5560 "Recover the visited file--get contents from its last auto-save file."
5561 (interactive)
5562 (recover-file buffer-file-name))
5564 (defun recover-file (file)
5565 "Visit file FILE, but get contents from its last auto-save file."
5566 ;; Actually putting the file name in the minibuffer should be used
5567 ;; only rarely.
5568 ;; Not just because users often use the default.
5569 (interactive "FRecover file: ")
5570 (setq file (expand-file-name file))
5571 (if (auto-save-file-name-p (file-name-nondirectory file))
5572 (error "%s is an auto-save file" (abbreviate-file-name file)))
5573 (let ((file-name (let ((buffer-file-name file))
5574 (make-auto-save-file-name))))
5575 (cond ((if (file-exists-p file)
5576 (not (file-newer-than-file-p file-name file))
5577 (not (file-exists-p file-name)))
5578 (error "Auto-save file %s not current"
5579 (abbreviate-file-name file-name)))
5580 ((with-temp-buffer-window
5581 "*Directory*" nil
5582 #'(lambda (window _value)
5583 (with-selected-window window
5584 (unwind-protect
5585 (yes-or-no-p (format "Recover auto save file %s? " file-name))
5586 (when (window-live-p window)
5587 (quit-restore-window window 'kill)))))
5588 (with-current-buffer standard-output
5589 (let ((switches dired-listing-switches))
5590 (if (file-symlink-p file)
5591 (setq switches (concat switches " -L")))
5592 ;; Use insert-directory-safely, not insert-directory,
5593 ;; because these files might not exist. In particular,
5594 ;; FILE might not exist if the auto-save file was for
5595 ;; a buffer that didn't visit a file, such as "*mail*".
5596 ;; The code in v20.x called `ls' directly, so we need
5597 ;; to emulate what `ls' did in that case.
5598 (insert-directory-safely file switches)
5599 (insert-directory-safely file-name switches))))
5600 (switch-to-buffer (find-file-noselect file t))
5601 (let ((inhibit-read-only t)
5602 ;; Keep the current buffer-file-coding-system.
5603 (coding-system buffer-file-coding-system)
5604 ;; Auto-saved file should be read with special coding.
5605 (coding-system-for-read 'auto-save-coding))
5606 (erase-buffer)
5607 (insert-file-contents file-name nil)
5608 (set-buffer-file-coding-system coding-system))
5609 (after-find-file nil nil t))
5610 (t (user-error "Recover-file canceled")))))
5612 (defun recover-session ()
5613 "Recover auto save files from a previous Emacs session.
5614 This command first displays a Dired buffer showing you the
5615 previous sessions that you could recover from.
5616 To choose one, move point to the proper line and then type C-c C-c.
5617 Then you'll be asked about a number of files to recover."
5618 (interactive)
5619 (if (null auto-save-list-file-prefix)
5620 (error "You set `auto-save-list-file-prefix' to disable making session files"))
5621 (let ((dir (file-name-directory auto-save-list-file-prefix)))
5622 (unless (file-directory-p dir)
5623 (make-directory dir t))
5624 (unless (directory-files dir nil
5625 (concat "\\`" (regexp-quote
5626 (file-name-nondirectory
5627 auto-save-list-file-prefix)))
5629 (error "No previous sessions to recover")))
5630 (let ((ls-lisp-support-shell-wildcards t))
5631 (dired (concat auto-save-list-file-prefix "*")
5632 (concat dired-listing-switches " -t")))
5633 (use-local-map (nconc (make-sparse-keymap) (current-local-map)))
5634 (define-key (current-local-map) "\C-c\C-c" 'recover-session-finish)
5635 (save-excursion
5636 (goto-char (point-min))
5637 (or (looking-at " Move to the session you want to recover,")
5638 (let ((inhibit-read-only t))
5639 ;; Each line starts with a space
5640 ;; so that Font Lock mode won't highlight the first character.
5641 (insert " To recover a session, move to it and type C-c C-c.\n"
5642 (substitute-command-keys
5643 " To delete a session file, type \
5644 \\[dired-flag-file-deletion] on its line to flag
5645 the file for deletion, then \\[dired-do-flagged-delete] to \
5646 delete flagged files.\n\n"))))))
5648 (defun recover-session-finish ()
5649 "Choose one saved session to recover auto-save files from.
5650 This command is used in the special Dired buffer created by
5651 \\[recover-session]."
5652 (interactive)
5653 ;; Get the name of the session file to recover from.
5654 (let ((file (dired-get-filename))
5655 files
5656 (buffer (get-buffer-create " *recover*")))
5657 (dired-unmark 1)
5658 (dired-do-flagged-delete t)
5659 (unwind-protect
5660 (with-current-buffer buffer
5661 ;; Read in the auto-save-list file.
5662 (erase-buffer)
5663 (insert-file-contents file)
5664 ;; Loop thru the text of that file
5665 ;; and get out the names of the files to recover.
5666 (while (not (eobp))
5667 (let (thisfile autofile)
5668 (if (eolp)
5669 ;; This is a pair of lines for a non-file-visiting buffer.
5670 ;; Get the auto-save file name and manufacture
5671 ;; a "visited file name" from that.
5672 (progn
5673 (forward-line 1)
5674 ;; If there is no auto-save file name, the
5675 ;; auto-save-list file is probably corrupted.
5676 (unless (eolp)
5677 (setq autofile
5678 (buffer-substring-no-properties
5679 (point)
5680 (line-end-position)))
5681 (setq thisfile
5682 (expand-file-name
5683 (substring
5684 (file-name-nondirectory autofile)
5685 1 -1)
5686 (file-name-directory autofile))))
5687 (forward-line 1))
5688 ;; This pair of lines is a file-visiting
5689 ;; buffer. Use the visited file name.
5690 (progn
5691 (setq thisfile
5692 (buffer-substring-no-properties
5693 (point) (progn (end-of-line) (point))))
5694 (forward-line 1)
5695 (setq autofile
5696 (buffer-substring-no-properties
5697 (point) (progn (end-of-line) (point))))
5698 (forward-line 1)))
5699 ;; Ignore a file if its auto-save file does not exist now.
5700 (if (and autofile (file-exists-p autofile))
5701 (setq files (cons thisfile files)))))
5702 (setq files (nreverse files))
5703 ;; The file contains a pair of line for each auto-saved buffer.
5704 ;; The first line of the pair contains the visited file name
5705 ;; or is empty if the buffer was not visiting a file.
5706 ;; The second line is the auto-save file name.
5707 (if files
5708 (map-y-or-n-p "Recover %s? "
5709 (lambda (file)
5710 (condition-case nil
5711 (save-excursion (recover-file file))
5712 (error
5713 "Failed to recover `%s'" file)))
5714 files
5715 '("file" "files" "recover"))
5716 (message "No files can be recovered from this session now")))
5717 (kill-buffer buffer))))
5719 (defun kill-buffer-ask (buffer)
5720 "Kill BUFFER if confirmed."
5721 (when (yes-or-no-p (format "Buffer %s %s. Kill? "
5722 (buffer-name buffer)
5723 (if (buffer-modified-p buffer)
5724 "HAS BEEN EDITED" "is unmodified")))
5725 (kill-buffer buffer)))
5727 (defun kill-some-buffers (&optional list)
5728 "Kill some buffers. Asks the user whether to kill each one of them.
5729 Non-interactively, if optional argument LIST is non-nil, it
5730 specifies the list of buffers to kill, asking for approval for each one."
5731 (interactive)
5732 (if (null list)
5733 (setq list (buffer-list)))
5734 (while list
5735 (let* ((buffer (car list))
5736 (name (buffer-name buffer)))
5737 (and name ; Can be nil for an indirect buffer
5738 ; if we killed the base buffer.
5739 (not (string-equal name ""))
5740 (/= (aref name 0) ?\s)
5741 (kill-buffer-ask buffer)))
5742 (setq list (cdr list))))
5744 (defun kill-matching-buffers (regexp &optional internal-too)
5745 "Kill buffers whose name matches the specified REGEXP.
5746 The optional second argument indicates whether to kill internal buffers too."
5747 (interactive "sKill buffers matching this regular expression: \nP")
5748 (dolist (buffer (buffer-list))
5749 (let ((name (buffer-name buffer)))
5750 (when (and name (not (string-equal name ""))
5751 (or internal-too (/= (aref name 0) ?\s))
5752 (string-match regexp name))
5753 (kill-buffer-ask buffer)))))
5756 (defun rename-auto-save-file ()
5757 "Adjust current buffer's auto save file name for current conditions.
5758 Also rename any existing auto save file, if it was made in this session."
5759 (let ((osave buffer-auto-save-file-name))
5760 (setq buffer-auto-save-file-name
5761 (make-auto-save-file-name))
5762 (if (and osave buffer-auto-save-file-name
5763 (not (string= buffer-auto-save-file-name buffer-file-name))
5764 (not (string= buffer-auto-save-file-name osave))
5765 (file-exists-p osave)
5766 (recent-auto-save-p))
5767 (rename-file osave buffer-auto-save-file-name t))))
5769 (defun make-auto-save-file-name ()
5770 "Return file name to use for auto-saves of current buffer.
5771 Does not consider `auto-save-visited-file-name' as that variable is checked
5772 before calling this function. You can redefine this for customization.
5773 See also `auto-save-file-name-p'."
5774 (if buffer-file-name
5775 (let ((handler (find-file-name-handler buffer-file-name
5776 'make-auto-save-file-name)))
5777 (if handler
5778 (funcall handler 'make-auto-save-file-name)
5779 (let ((list auto-save-file-name-transforms)
5780 (filename buffer-file-name)
5781 result uniq)
5782 ;; Apply user-specified translations
5783 ;; to the file name.
5784 (while (and list (not result))
5785 (if (string-match (car (car list)) filename)
5786 (setq result (replace-match (cadr (car list)) t nil
5787 filename)
5788 uniq (car (cddr (car list)))))
5789 (setq list (cdr list)))
5790 (if result
5791 (if uniq
5792 (setq filename (concat
5793 (file-name-directory result)
5794 (subst-char-in-string
5795 ?/ ?!
5796 (replace-regexp-in-string "!" "!!"
5797 filename))))
5798 (setq filename result)))
5799 (setq result
5800 (if (and (eq system-type 'ms-dos)
5801 (not (msdos-long-file-names)))
5802 ;; We truncate the file name to DOS 8+3 limits
5803 ;; before doing anything else, because the regexp
5804 ;; passed to string-match below cannot handle
5805 ;; extensions longer than 3 characters, multiple
5806 ;; dots, and other atrocities.
5807 (let ((fn (dos-8+3-filename
5808 (file-name-nondirectory buffer-file-name))))
5809 (string-match
5810 "\\`\\([^.]+\\)\\(\\.\\(..?\\)?.?\\|\\)\\'"
5812 (concat (file-name-directory buffer-file-name)
5813 "#" (match-string 1 fn)
5814 "." (match-string 3 fn) "#"))
5815 (concat (file-name-directory filename)
5817 (file-name-nondirectory filename)
5818 "#")))
5819 ;; Make sure auto-save file names don't contain characters
5820 ;; invalid for the underlying filesystem.
5821 (if (and (memq system-type '(ms-dos windows-nt cygwin))
5822 ;; Don't modify remote (ange-ftp) filenames
5823 (not (string-match "^/\\w+@[-A-Za-z0-9._]+:" result)))
5824 (convert-standard-filename result)
5825 result))))
5827 ;; Deal with buffers that don't have any associated files. (Mail
5828 ;; mode tends to create a good number of these.)
5830 (let ((buffer-name (buffer-name))
5831 (limit 0)
5832 file-name)
5833 ;; Restrict the characters used in the file name to those which
5834 ;; are known to be safe on all filesystems, url-encoding the
5835 ;; rest.
5836 ;; We do this on all platforms, because even if we are not
5837 ;; running on DOS/Windows, the current directory may be on a
5838 ;; mounted VFAT filesystem, such as a USB memory stick.
5839 (while (string-match "[^A-Za-z0-9-_.~#+]" buffer-name limit)
5840 (let* ((character (aref buffer-name (match-beginning 0)))
5841 (replacement
5842 ;; For multibyte characters, this will produce more than
5843 ;; 2 hex digits, so is not true URL encoding.
5844 (format "%%%02X" character)))
5845 (setq buffer-name (replace-match replacement t t buffer-name))
5846 (setq limit (1+ (match-end 0)))))
5847 ;; Generate the file name.
5848 (setq file-name
5849 (make-temp-file
5850 (let ((fname
5851 (expand-file-name
5852 (format "#%s#" buffer-name)
5853 ;; Try a few alternative directories, to get one we can
5854 ;; write it.
5855 (cond
5856 ((file-writable-p default-directory) default-directory)
5857 ((file-writable-p "/var/tmp/") "/var/tmp/")
5858 ("~/")))))
5859 (if (and (memq system-type '(ms-dos windows-nt cygwin))
5860 ;; Don't modify remote (ange-ftp) filenames
5861 (not (string-match "^/\\w+@[-A-Za-z0-9._]+:" fname)))
5862 ;; The call to convert-standard-filename is in case
5863 ;; buffer-name includes characters not allowed by the
5864 ;; DOS/Windows filesystems. make-temp-file writes to the
5865 ;; file it creates, so we must fix the file name _before_
5866 ;; make-temp-file is called.
5867 (convert-standard-filename fname)
5868 fname))
5869 nil "#"))
5870 ;; make-temp-file creates the file,
5871 ;; but we don't want it to exist until we do an auto-save.
5872 (condition-case ()
5873 (delete-file file-name)
5874 (file-error nil))
5875 file-name)))
5877 (defun auto-save-file-name-p (filename)
5878 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
5879 FILENAME should lack slashes. You can redefine this for customization."
5880 (string-match "\\`#.*#\\'" filename))
5882 (defun wildcard-to-regexp (wildcard)
5883 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
5884 The generated regexp will match a filename only if the filename
5885 matches that wildcard according to shell rules. Only wildcards known
5886 by `sh' are supported."
5887 (let* ((i (string-match "[[.*+\\^$?]" wildcard))
5888 ;; Copy the initial run of non-special characters.
5889 (result (substring wildcard 0 i))
5890 (len (length wildcard)))
5891 ;; If no special characters, we're almost done.
5892 (if i
5893 (while (< i len)
5894 (let ((ch (aref wildcard i))
5896 (setq
5897 result
5898 (concat result
5899 (cond
5900 ((and (eq ch ?\[)
5901 (< (1+ i) len)
5902 (eq (aref wildcard (1+ i)) ?\]))
5903 "\\[")
5904 ((eq ch ?\[) ; [...] maps to regexp char class
5905 (progn
5906 (setq i (1+ i))
5907 (concat
5908 (cond
5909 ((eq (aref wildcard i) ?!) ; [!...] -> [^...]
5910 (progn
5911 (setq i (1+ i))
5912 (if (eq (aref wildcard i) ?\])
5913 (progn
5914 (setq i (1+ i))
5915 "[^]")
5916 "[^")))
5917 ((eq (aref wildcard i) ?^)
5918 ;; Found "[^". Insert a `\0' character
5919 ;; (which cannot happen in a filename)
5920 ;; into the character class, so that `^'
5921 ;; is not the first character after `[',
5922 ;; and thus non-special in a regexp.
5923 (progn
5924 (setq i (1+ i))
5925 "[\000^"))
5926 ((eq (aref wildcard i) ?\])
5927 ;; I don't think `]' can appear in a
5928 ;; character class in a wildcard, but
5929 ;; let's be general here.
5930 (progn
5931 (setq i (1+ i))
5932 "[]"))
5933 (t "["))
5934 (prog1 ; copy everything upto next `]'.
5935 (substring wildcard
5937 (setq j (string-match
5938 "]" wildcard i)))
5939 (setq i (if j (1- j) (1- len)))))))
5940 ((eq ch ?.) "\\.")
5941 ((eq ch ?*) "[^\000]*")
5942 ((eq ch ?+) "\\+")
5943 ((eq ch ?^) "\\^")
5944 ((eq ch ?$) "\\$")
5945 ((eq ch ?\\) "\\\\") ; probably cannot happen...
5946 ((eq ch ??) "[^\000]")
5947 (t (char-to-string ch)))))
5948 (setq i (1+ i)))))
5949 ;; Shell wildcards should match the entire filename,
5950 ;; not its part. Make the regexp say so.
5951 (concat "\\`" result "\\'")))
5953 (defcustom list-directory-brief-switches
5954 (purecopy "-CF")
5955 "Switches for `list-directory' to pass to `ls' for brief listing."
5956 :type 'string
5957 :group 'dired)
5959 (defcustom list-directory-verbose-switches
5960 (purecopy "-l")
5961 "Switches for `list-directory' to pass to `ls' for verbose listing."
5962 :type 'string
5963 :group 'dired)
5965 (defun file-expand-wildcards (pattern &optional full)
5966 "Expand wildcard pattern PATTERN.
5967 This returns a list of file names which match the pattern.
5969 If PATTERN is written as an absolute file name,
5970 the values are absolute also.
5972 If PATTERN is written as a relative file name, it is interpreted
5973 relative to the current default directory, `default-directory'.
5974 The file names returned are normally also relative to the current
5975 default directory. However, if FULL is non-nil, they are absolute."
5976 (save-match-data
5977 (let* ((nondir (file-name-nondirectory pattern))
5978 (dirpart (file-name-directory pattern))
5979 ;; A list of all dirs that DIRPART specifies.
5980 ;; This can be more than one dir
5981 ;; if DIRPART contains wildcards.
5982 (dirs (if (and dirpart
5983 (string-match "[[*?]"
5984 (or (file-remote-p dirpart 'localname)
5985 dirpart)))
5986 (mapcar 'file-name-as-directory
5987 (file-expand-wildcards (directory-file-name dirpart)))
5988 (list dirpart)))
5989 contents)
5990 (while dirs
5991 (when (or (null (car dirs)) ; Possible if DIRPART is not wild.
5992 (and (file-directory-p (directory-file-name (car dirs)))
5993 (file-readable-p (car dirs))))
5994 (let ((this-dir-contents
5995 ;; Filter out "." and ".."
5996 (delq nil
5997 (mapcar #'(lambda (name)
5998 (unless (string-match "\\`\\.\\.?\\'"
5999 (file-name-nondirectory name))
6000 name))
6001 (directory-files (or (car dirs) ".") full
6002 (wildcard-to-regexp nondir))))))
6003 (setq contents
6004 (nconc
6005 (if (and (car dirs) (not full))
6006 (mapcar (function (lambda (name) (concat (car dirs) name)))
6007 this-dir-contents)
6008 this-dir-contents)
6009 contents))))
6010 (setq dirs (cdr dirs)))
6011 contents)))
6013 ;; Let Tramp know that `file-expand-wildcards' does not need an advice.
6014 (provide 'files '(remote-wildcards))
6016 (defun list-directory (dirname &optional verbose)
6017 "Display a list of files in or matching DIRNAME, a la `ls'.
6018 DIRNAME is globbed by the shell if necessary.
6019 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
6020 Actions controlled by variables `list-directory-brief-switches'
6021 and `list-directory-verbose-switches'."
6022 (interactive (let ((pfx current-prefix-arg))
6023 (list (read-directory-name (if pfx "List directory (verbose): "
6024 "List directory (brief): ")
6025 nil default-directory nil)
6026 pfx)))
6027 (let ((switches (if verbose list-directory-verbose-switches
6028 list-directory-brief-switches))
6029 buffer)
6030 (or dirname (setq dirname default-directory))
6031 (setq dirname (expand-file-name dirname))
6032 (with-output-to-temp-buffer "*Directory*"
6033 (setq buffer standard-output)
6034 (buffer-disable-undo standard-output)
6035 (princ "Directory ")
6036 (princ dirname)
6037 (terpri)
6038 (with-current-buffer "*Directory*"
6039 (let ((wildcard (not (file-directory-p dirname))))
6040 (insert-directory dirname switches wildcard (not wildcard)))))
6041 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
6042 (with-current-buffer buffer
6043 (setq default-directory
6044 (if (file-directory-p dirname)
6045 (file-name-as-directory dirname)
6046 (file-name-directory dirname))))))
6048 (defun shell-quote-wildcard-pattern (pattern)
6049 "Quote characters special to the shell in PATTERN, leave wildcards alone.
6051 PATTERN is assumed to represent a file-name wildcard suitable for the
6052 underlying filesystem. For Unix and GNU/Linux, each character from the
6053 set [ \\t\\n;<>&|()'\"#$] is quoted with a backslash; for DOS/Windows, all
6054 the parts of the pattern which don't include wildcard characters are
6055 quoted with double quotes.
6057 This function leaves alone existing quote characters (\\ on Unix and \"
6058 on Windows), so PATTERN can use them to quote wildcard characters that
6059 need to be passed verbatim to shell commands."
6060 (save-match-data
6061 (cond
6062 ((memq system-type '(ms-dos windows-nt cygwin))
6063 ;; DOS/Windows don't allow `"' in file names. So if the
6064 ;; argument has quotes, we can safely assume it is already
6065 ;; quoted by the caller.
6066 (if (or (string-match "[\"]" pattern)
6067 ;; We quote [&()#$'] in case their shell is a port of a
6068 ;; Unixy shell. We quote [,=+] because stock DOS and
6069 ;; Windows shells require that in some cases, such as
6070 ;; passing arguments to batch files that use positional
6071 ;; arguments like %1.
6072 (not (string-match "[ \t;&()#$',=+]" pattern)))
6073 pattern
6074 (let ((result "\"")
6075 (beg 0)
6076 end)
6077 (while (string-match "[*?]+" pattern beg)
6078 (setq end (match-beginning 0)
6079 result (concat result (substring pattern beg end)
6080 "\""
6081 (substring pattern end (match-end 0))
6082 "\"")
6083 beg (match-end 0)))
6084 (concat result (substring pattern beg) "\""))))
6086 (let ((beg 0))
6087 (while (string-match "[ \t\n;<>&|()'\"#$]" pattern beg)
6088 (setq pattern
6089 (concat (substring pattern 0 (match-beginning 0))
6090 "\\"
6091 (substring pattern (match-beginning 0)))
6092 beg (1+ (match-end 0)))))
6093 pattern))))
6096 (defvar insert-directory-program (purecopy "ls")
6097 "Absolute or relative name of the `ls' program used by `insert-directory'.")
6099 (defcustom directory-free-space-program (purecopy "df")
6100 "Program to get the amount of free space on a file system.
6101 We assume the output has the format of `df'.
6102 The value of this variable must be just a command name or file name;
6103 if you want to specify options, use `directory-free-space-args'.
6105 A value of nil disables this feature.
6107 If the function `file-system-info' is defined, it is always used in
6108 preference to the program given by this variable."
6109 :type '(choice (string :tag "Program") (const :tag "None" nil))
6110 :group 'dired)
6112 (defcustom directory-free-space-args
6113 (purecopy (if (eq system-type 'darwin) "-k" "-Pk"))
6114 "Options to use when running `directory-free-space-program'."
6115 :type 'string
6116 :group 'dired)
6118 (defun get-free-disk-space (dir)
6119 "Return the amount of free space on directory DIR's file system.
6120 The return value is a string describing the amount of free
6121 space (normally, the number of free 1KB blocks).
6123 This function calls `file-system-info' if it is available, or
6124 invokes the program specified by `directory-free-space-program'
6125 and `directory-free-space-args'. If the system call or program
6126 is unsuccessful, or if DIR is a remote directory, this function
6127 returns nil."
6128 (unless (file-remote-p dir)
6129 ;; Try to find the number of free blocks. Non-Posix systems don't
6130 ;; always have df, but might have an equivalent system call.
6131 (if (fboundp 'file-system-info)
6132 (let ((fsinfo (file-system-info dir)))
6133 (if fsinfo
6134 (format "%.0f" (/ (nth 2 fsinfo) 1024))))
6135 (setq dir (expand-file-name dir))
6136 (save-match-data
6137 (with-temp-buffer
6138 (when (and directory-free-space-program
6139 ;; Avoid failure if the default directory does
6140 ;; not exist (Bug#2631, Bug#3911).
6141 (let ((default-directory
6142 (locate-dominating-file dir 'file-directory-p)))
6143 (eq (process-file directory-free-space-program
6144 nil t nil
6145 directory-free-space-args
6146 (file-relative-name dir))
6147 0)))
6148 ;; Assume that the "available" column is before the
6149 ;; "capacity" column. Find the "%" and scan backward.
6150 (goto-char (point-min))
6151 (forward-line 1)
6152 (when (re-search-forward
6153 "[[:space:]]+[^[:space:]]+%[^%]*$"
6154 (line-end-position) t)
6155 (goto-char (match-beginning 0))
6156 (let ((endpt (point)))
6157 (skip-chars-backward "^[:space:]")
6158 (buffer-substring-no-properties (point) endpt)))))))))
6160 ;; The following expression replaces `dired-move-to-filename-regexp'.
6161 (defvar directory-listing-before-filename-regexp
6162 (let* ((l "\\([A-Za-z]\\|[^\0-\177]\\)")
6163 (l-or-quote "\\([A-Za-z']\\|[^\0-\177]\\)")
6164 ;; In some locales, month abbreviations are as short as 2 letters,
6165 ;; and they can be followed by ".".
6166 ;; In Breton, a month name can include a quote character.
6167 (month (concat l-or-quote l-or-quote "+\\.?"))
6168 (s " ")
6169 (yyyy "[0-9][0-9][0-9][0-9]")
6170 (dd "[ 0-3][0-9]")
6171 (HH:MM "[ 0-2][0-9][:.][0-5][0-9]")
6172 (seconds "[0-6][0-9]\\([.,][0-9]+\\)?")
6173 (zone "[-+][0-2][0-9][0-5][0-9]")
6174 (iso-mm-dd "[01][0-9]-[0-3][0-9]")
6175 (iso-time (concat HH:MM "\\(:" seconds "\\( ?" zone "\\)?\\)?"))
6176 (iso (concat "\\(\\(" yyyy "-\\)?" iso-mm-dd "[ T]" iso-time
6177 "\\|" yyyy "-" iso-mm-dd "\\)"))
6178 (western (concat "\\(" month s "+" dd "\\|" dd "\\.?" s month "\\)"
6179 s "+"
6180 "\\(" HH:MM "\\|" yyyy "\\)"))
6181 (western-comma (concat month s "+" dd "," s "+" yyyy))
6182 ;; Japanese MS-Windows ls-lisp has one-digit months, and
6183 ;; omits the Kanji characters after month and day-of-month.
6184 ;; On Mac OS X 10.3, the date format in East Asian locales is
6185 ;; day-of-month digits followed by month digits.
6186 (mm "[ 0-1]?[0-9]")
6187 (east-asian
6188 (concat "\\(" mm l "?" s dd l "?" s "+"
6189 "\\|" dd s mm s "+" "\\)"
6190 "\\(" HH:MM "\\|" yyyy l "?" "\\)")))
6191 ;; The "[0-9]" below requires the previous column to end in a digit.
6192 ;; This avoids recognizing `1 may 1997' as a date in the line:
6193 ;; -r--r--r-- 1 may 1997 1168 Oct 19 16:49 README
6195 ;; The "[BkKMGTPEZY]?" below supports "ls -alh" output.
6197 ;; For non-iso date formats, we add the ".*" in order to find
6198 ;; the last possible match. This avoids recognizing
6199 ;; `jservice 10 1024' as a date in the line:
6200 ;; drwxr-xr-x 3 jservice 10 1024 Jul 2 1997 esg-host
6202 ;; vc dired listings provide the state or blanks between file
6203 ;; permissions and date. The state is always surrounded by
6204 ;; parentheses:
6205 ;; -rw-r--r-- (modified) 2005-10-22 21:25 files.el
6206 ;; This is not supported yet.
6207 (purecopy (concat "\\([0-9][BkKMGTPEZY]? " iso
6208 "\\|.*[0-9][BkKMGTPEZY]? "
6209 "\\(" western "\\|" western-comma "\\|" east-asian "\\)"
6210 "\\) +")))
6211 "Regular expression to match up to the file name in a directory listing.
6212 The default value is designed to recognize dates and times
6213 regardless of the language.")
6215 (defvar insert-directory-ls-version 'unknown)
6217 ;; insert-directory
6218 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
6219 ;; FULL-DIRECTORY-P is nil.
6220 ;; The single line of output must display FILE's name as it was
6221 ;; given, namely, an absolute path name.
6222 ;; - must insert exactly one line for each file if WILDCARD or
6223 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
6224 ;; before the file lines, plus optional text after the file lines.
6225 ;; Lines are delimited by "\n", so filenames containing "\n" are not
6226 ;; allowed.
6227 ;; File lines should display the basename.
6228 ;; - must be consistent with
6229 ;; - functions dired-move-to-filename, (these two define what a file line is)
6230 ;; dired-move-to-end-of-filename,
6231 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
6232 ;; dired-insert-headerline
6233 ;; dired-after-subdir-garbage (defines what a "total" line is)
6234 ;; - variable dired-subdir-regexp
6235 ;; - may be passed "--dired" as the first argument in SWITCHES.
6236 ;; Filename handlers might have to remove this switch if their
6237 ;; "ls" command does not support it.
6238 (defun insert-directory (file switches &optional wildcard full-directory-p)
6239 "Insert directory listing for FILE, formatted according to SWITCHES.
6240 Leaves point after the inserted text.
6241 SWITCHES may be a string of options, or a list of strings
6242 representing individual options.
6243 Optional third arg WILDCARD means treat FILE as shell wildcard.
6244 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
6245 switches do not contain `d', so that a full listing is expected.
6247 This works by running a directory listing program
6248 whose name is in the variable `insert-directory-program'.
6249 If WILDCARD, it also runs the shell specified by `shell-file-name'.
6251 When SWITCHES contains the long `--dired' option, this function
6252 treats it specially, for the sake of dired. However, the
6253 normally equivalent short `-D' option is just passed on to
6254 `insert-directory-program', as any other option."
6255 ;; We need the directory in order to find the right handler.
6256 (let ((handler (find-file-name-handler (expand-file-name file)
6257 'insert-directory)))
6258 (if handler
6259 (funcall handler 'insert-directory file switches
6260 wildcard full-directory-p)
6261 (let (result (beg (point)))
6263 ;; Read the actual directory using `insert-directory-program'.
6264 ;; RESULT gets the status code.
6265 (let* (;; We at first read by no-conversion, then after
6266 ;; putting text property `dired-filename, decode one
6267 ;; bunch by one to preserve that property.
6268 (coding-system-for-read 'no-conversion)
6269 ;; This is to control encoding the arguments in call-process.
6270 (coding-system-for-write
6271 (and enable-multibyte-characters
6272 (or file-name-coding-system
6273 default-file-name-coding-system))))
6274 (setq result
6275 (if wildcard
6276 ;; Run ls in the directory part of the file pattern
6277 ;; using the last component as argument.
6278 (let ((default-directory
6279 (if (file-name-absolute-p file)
6280 (file-name-directory file)
6281 (file-name-directory (expand-file-name file))))
6282 (pattern (file-name-nondirectory file)))
6283 ;; NB since switches is passed to the shell, be
6284 ;; careful of malicious values, eg "-l;reboot".
6285 ;; See eg dired-safe-switches-p.
6286 (call-process
6287 shell-file-name nil t nil
6288 "-c"
6289 (concat (if (memq system-type '(ms-dos windows-nt))
6291 "\\") ; Disregard Unix shell aliases!
6292 insert-directory-program
6293 " -d "
6294 (if (stringp switches)
6295 switches
6296 (mapconcat 'identity switches " "))
6297 " -- "
6298 ;; Quote some characters that have
6299 ;; special meanings in shells; but
6300 ;; don't quote the wildcards--we want
6301 ;; them to be special. We also
6302 ;; currently don't quote the quoting
6303 ;; characters in case people want to
6304 ;; use them explicitly to quote
6305 ;; wildcard characters.
6306 (shell-quote-wildcard-pattern pattern))))
6307 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
6308 ;; directory if FILE is a symbolic link.
6309 (unless full-directory-p
6310 (setq switches
6311 (cond
6312 ((stringp switches) (concat switches " -d"))
6313 ((member "-d" switches) switches)
6314 (t (append switches '("-d"))))))
6315 (apply 'call-process
6316 insert-directory-program nil t nil
6317 (append
6318 (if (listp switches) switches
6319 (unless (equal switches "")
6320 ;; Split the switches at any spaces so we can
6321 ;; pass separate options as separate args.
6322 (split-string switches)))
6323 ;; Avoid lossage if FILE starts with `-'.
6324 '("--")
6325 (progn
6326 (if (string-match "\\`~" file)
6327 (setq file (expand-file-name file)))
6328 (list
6329 (if full-directory-p
6330 (concat (file-name-as-directory file) ".")
6331 file))))))))
6333 ;; If we got "//DIRED//" in the output, it means we got a real
6334 ;; directory listing, even if `ls' returned nonzero.
6335 ;; So ignore any errors.
6336 (when (if (stringp switches)
6337 (string-match "--dired\\>" switches)
6338 (member "--dired" switches))
6339 (save-excursion
6340 (forward-line -2)
6341 (when (looking-at "//SUBDIRED//")
6342 (forward-line -1))
6343 (if (looking-at "//DIRED//")
6344 (setq result 0))))
6346 (when (and (not (eq 0 result))
6347 (eq insert-directory-ls-version 'unknown))
6348 ;; The first time ls returns an error,
6349 ;; find the version numbers of ls,
6350 ;; and set insert-directory-ls-version
6351 ;; to > if it is more than 5.2.1, < if it is less, nil if it
6352 ;; is equal or if the info cannot be obtained.
6353 ;; (That can mean it isn't GNU ls.)
6354 (let ((version-out
6355 (with-temp-buffer
6356 (call-process "ls" nil t nil "--version")
6357 (buffer-string))))
6358 (if (string-match "ls (.*utils) \\([0-9.]*\\)$" version-out)
6359 (let* ((version (match-string 1 version-out))
6360 (split (split-string version "[.]"))
6361 (numbers (mapcar 'string-to-number split))
6362 (min '(5 2 1))
6363 comparison)
6364 (while (and (not comparison) (or numbers min))
6365 (cond ((null min)
6366 (setq comparison '>))
6367 ((null numbers)
6368 (setq comparison '<))
6369 ((> (car numbers) (car min))
6370 (setq comparison '>))
6371 ((< (car numbers) (car min))
6372 (setq comparison '<))
6374 (setq numbers (cdr numbers)
6375 min (cdr min)))))
6376 (setq insert-directory-ls-version (or comparison '=)))
6377 (setq insert-directory-ls-version nil))))
6379 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
6380 (when (and (eq 1 result) (eq insert-directory-ls-version '>))
6381 (setq result 0))
6383 ;; If `insert-directory-program' failed, signal an error.
6384 (unless (eq 0 result)
6385 ;; Delete the error message it may have output.
6386 (delete-region beg (point))
6387 ;; On non-Posix systems, we cannot open a directory, so
6388 ;; don't even try, because that will always result in
6389 ;; the ubiquitous "Access denied". Instead, show the
6390 ;; command line so the user can try to guess what went wrong.
6391 (if (and (file-directory-p file)
6392 (memq system-type '(ms-dos windows-nt)))
6393 (error
6394 "Reading directory: \"%s %s -- %s\" exited with status %s"
6395 insert-directory-program
6396 (if (listp switches) (concat switches) switches)
6397 file result)
6398 ;; Unix. Access the file to get a suitable error.
6399 (access-file file "Reading directory")
6400 (error "Listing directory failed but `access-file' worked")))
6402 (when (if (stringp switches)
6403 (string-match "--dired\\>" switches)
6404 (member "--dired" switches))
6405 ;; The following overshoots by one line for an empty
6406 ;; directory listed with "--dired", but without "-a"
6407 ;; switch, where the ls output contains a
6408 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
6409 ;; We take care of that case later.
6410 (forward-line -2)
6411 (when (looking-at "//SUBDIRED//")
6412 (delete-region (point) (progn (forward-line 1) (point)))
6413 (forward-line -1))
6414 (if (looking-at "//DIRED//")
6415 (let ((end (line-end-position))
6416 (linebeg (point))
6417 error-lines)
6418 ;; Find all the lines that are error messages,
6419 ;; and record the bounds of each one.
6420 (goto-char beg)
6421 (while (< (point) linebeg)
6422 (or (eql (following-char) ?\s)
6423 (push (list (point) (line-end-position)) error-lines))
6424 (forward-line 1))
6425 (setq error-lines (nreverse error-lines))
6426 ;; Now read the numeric positions of file names.
6427 (goto-char linebeg)
6428 (forward-word 1)
6429 (forward-char 3)
6430 (while (< (point) end)
6431 (let ((start (insert-directory-adj-pos
6432 (+ beg (read (current-buffer)))
6433 error-lines))
6434 (end (insert-directory-adj-pos
6435 (+ beg (read (current-buffer)))
6436 error-lines)))
6437 (if (memq (char-after end) '(?\n ?\s))
6438 ;; End is followed by \n or by " -> ".
6439 (put-text-property start end 'dired-filename t)
6440 ;; It seems that we can't trust ls's output as to
6441 ;; byte positions of filenames.
6442 (put-text-property beg (point) 'dired-filename nil)
6443 (end-of-line))))
6444 (goto-char end)
6445 (beginning-of-line)
6446 (delete-region (point) (progn (forward-line 1) (point))))
6447 ;; Take care of the case where the ls output contains a
6448 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
6449 ;; and we went one line too far back (see above).
6450 (forward-line 1))
6451 (if (looking-at "//DIRED-OPTIONS//")
6452 (delete-region (point) (progn (forward-line 1) (point)))))
6454 ;; Now decode what read if necessary.
6455 (let ((coding (or coding-system-for-read
6456 file-name-coding-system
6457 default-file-name-coding-system
6458 'undecided))
6459 coding-no-eol
6460 val pos)
6461 (when (and enable-multibyte-characters
6462 (not (memq (coding-system-base coding)
6463 '(raw-text no-conversion))))
6464 ;; If no coding system is specified or detection is
6465 ;; requested, detect the coding.
6466 (if (eq (coding-system-base coding) 'undecided)
6467 (setq coding (detect-coding-region beg (point) t)))
6468 (if (not (eq (coding-system-base coding) 'undecided))
6469 (save-restriction
6470 (setq coding-no-eol
6471 (coding-system-change-eol-conversion coding 'unix))
6472 (narrow-to-region beg (point))
6473 (goto-char (point-min))
6474 (while (not (eobp))
6475 (setq pos (point)
6476 val (get-text-property (point) 'dired-filename))
6477 (goto-char (next-single-property-change
6478 (point) 'dired-filename nil (point-max)))
6479 ;; Force no eol conversion on a file name, so
6480 ;; that CR is preserved.
6481 (decode-coding-region pos (point)
6482 (if val coding-no-eol coding))
6483 (if val
6484 (put-text-property pos (point)
6485 'dired-filename t)))))))
6487 (if full-directory-p
6488 ;; Try to insert the amount of free space.
6489 (save-excursion
6490 (goto-char beg)
6491 ;; First find the line to put it on.
6492 (when (re-search-forward "^ *\\(total\\)" nil t)
6493 (let ((available (get-free-disk-space ".")))
6494 (when available
6495 ;; Replace "total" with "used", to avoid confusion.
6496 (replace-match "total used in directory" nil nil nil 1)
6497 (end-of-line)
6498 (insert " available " available))))))))))
6500 (defun insert-directory-adj-pos (pos error-lines)
6501 "Convert `ls --dired' file name position value POS to a buffer position.
6502 File name position values returned in ls --dired output
6503 count only stdout; they don't count the error messages sent to stderr.
6504 So this function converts to them to real buffer positions.
6505 ERROR-LINES is a list of buffer positions of error message lines,
6506 of the form (START END)."
6507 (while (and error-lines (< (caar error-lines) pos))
6508 (setq pos (+ pos (- (nth 1 (car error-lines)) (nth 0 (car error-lines)))))
6509 (pop error-lines))
6510 pos)
6512 (defun insert-directory-safely (file switches
6513 &optional wildcard full-directory-p)
6514 "Insert directory listing for FILE, formatted according to SWITCHES.
6516 Like `insert-directory', but if FILE does not exist, it inserts a
6517 message to that effect instead of signaling an error."
6518 (if (file-exists-p file)
6519 (insert-directory file switches wildcard full-directory-p)
6520 ;; Simulate the message printed by `ls'.
6521 (insert (format "%s: No such file or directory\n" file))))
6523 (defvar kill-emacs-query-functions nil
6524 "Functions to call with no arguments to query about killing Emacs.
6525 If any of these functions returns nil, killing Emacs is canceled.
6526 `save-buffers-kill-emacs' calls these functions, but `kill-emacs',
6527 the low level primitive, does not. See also `kill-emacs-hook'.")
6529 (defcustom confirm-kill-emacs nil
6530 "How to ask for confirmation when leaving Emacs.
6531 If nil, the default, don't ask at all. If the value is non-nil, it should
6532 be a predicate function; for example `yes-or-no-p'."
6533 :type '(choice (const :tag "Ask with yes-or-no-p" yes-or-no-p)
6534 (const :tag "Ask with y-or-n-p" y-or-n-p)
6535 (const :tag "Don't confirm" nil)
6536 (function :tag "Predicate function"))
6537 :group 'convenience
6538 :version "21.1")
6540 (defun save-buffers-kill-emacs (&optional arg)
6541 "Offer to save each buffer, then kill this Emacs process.
6542 With prefix ARG, silently save all file-visiting buffers without asking.
6543 If there are active processes where `process-query-on-exit-flag'
6544 returns non-nil, asks whether processes should be killed.
6545 Runs the members of `kill-emacs-query-functions' in turn and stops
6546 if any returns nil. If `confirm-kill-emacs' is non-nil, calls it."
6547 (interactive "P")
6548 (save-some-buffers arg t)
6549 (and (or (not (memq t (mapcar (function
6550 (lambda (buf) (and (buffer-file-name buf)
6551 (buffer-modified-p buf))))
6552 (buffer-list))))
6553 (yes-or-no-p "Modified buffers exist; exit anyway? "))
6554 (or (not (fboundp 'process-list))
6555 ;; process-list is not defined on MSDOS.
6556 (let ((processes (process-list))
6557 active)
6558 (while processes
6559 (and (memq (process-status (car processes)) '(run stop open listen))
6560 (process-query-on-exit-flag (car processes))
6561 (setq active t))
6562 (setq processes (cdr processes)))
6563 (or (not active)
6564 (with-current-buffer-window
6565 (get-buffer-create "*Process List*") nil
6566 #'(lambda (window _value)
6567 (with-selected-window window
6568 (unwind-protect
6569 (yes-or-no-p "Active processes exist; kill them and exit anyway? ")
6570 (when (window-live-p window)
6571 (quit-restore-window window 'kill)))))
6572 (list-processes t)))))
6573 ;; Query the user for other things, perhaps.
6574 (run-hook-with-args-until-failure 'kill-emacs-query-functions)
6575 (or (null confirm-kill-emacs)
6576 (funcall confirm-kill-emacs "Really exit Emacs? "))
6577 (kill-emacs)))
6579 (defun save-buffers-kill-terminal (&optional arg)
6580 "Offer to save each buffer, then kill the current connection.
6581 If the current frame has no client, kill Emacs itself.
6583 With prefix ARG, silently save all file-visiting buffers, then kill.
6585 If emacsclient was started with a list of filenames to edit, then
6586 only these files will be asked to be saved."
6587 (interactive "P")
6588 (if (frame-parameter nil 'client)
6589 (server-save-buffers-kill-terminal arg)
6590 (save-buffers-kill-emacs arg)))
6592 ;; We use /: as a prefix to "quote" a file name
6593 ;; so that magic file name handlers will not apply to it.
6595 (setq file-name-handler-alist
6596 (cons (cons (purecopy "\\`/:") 'file-name-non-special)
6597 file-name-handler-alist))
6599 ;; We depend on being the last handler on the list,
6600 ;; so that anything else which does need handling
6601 ;; has been handled already.
6602 ;; So it is safe for us to inhibit *all* magic file name handlers.
6604 (defun file-name-non-special (operation &rest arguments)
6605 (let ((file-name-handler-alist nil)
6606 (default-directory
6607 (if (eq operation 'insert-directory)
6608 (directory-file-name
6609 (expand-file-name
6610 (unhandled-file-name-directory default-directory)))
6611 default-directory))
6612 ;; Get a list of the indices of the args which are file names.
6613 (file-arg-indices
6614 (cdr (or (assq operation
6615 ;; The first six are special because they
6616 ;; return a file name. We want to include the /:
6617 ;; in the return value.
6618 ;; So just avoid stripping it in the first place.
6619 '((expand-file-name . nil)
6620 (file-name-directory . nil)
6621 (file-name-as-directory . nil)
6622 (directory-file-name . nil)
6623 (file-name-sans-versions . nil)
6624 (find-backup-file-name . nil)
6625 ;; `identity' means just return the first arg
6626 ;; not stripped of its quoting.
6627 (substitute-in-file-name identity)
6628 ;; `add' means add "/:" to the result.
6629 (file-truename add 0)
6630 (insert-file-contents insert-file-contents 0)
6631 ;; `unquote-then-quote' means set buffer-file-name
6632 ;; temporarily to unquoted filename.
6633 (verify-visited-file-modtime unquote-then-quote)
6634 ;; List the arguments which are filenames.
6635 (file-name-completion 1)
6636 (file-name-all-completions 1)
6637 (write-region 2 5)
6638 (rename-file 0 1)
6639 (copy-file 0 1)
6640 (make-symbolic-link 0 1)
6641 (add-name-to-file 0 1)))
6642 ;; For all other operations, treat the first argument only
6643 ;; as the file name.
6644 '(nil 0))))
6645 method
6646 ;; Copy ARGUMENTS so we can replace elements in it.
6647 (arguments (copy-sequence arguments)))
6648 (if (symbolp (car file-arg-indices))
6649 (setq method (pop file-arg-indices)))
6650 ;; Strip off the /: from the file names that have it.
6651 (save-match-data
6652 (while (consp file-arg-indices)
6653 (let ((pair (nthcdr (car file-arg-indices) arguments)))
6654 (and (car pair)
6655 (string-match "\\`/:" (car pair))
6656 (setcar pair
6657 (if (= (length (car pair)) 2)
6659 (substring (car pair) 2)))))
6660 (setq file-arg-indices (cdr file-arg-indices))))
6661 (pcase method
6662 (`identity (car arguments))
6663 (`add (concat "/:" (apply operation arguments)))
6664 (`insert-file-contents
6665 (let ((visit (nth 1 arguments)))
6666 (prog1
6667 (apply operation arguments)
6668 (when (and visit buffer-file-name)
6669 (setq buffer-file-name (concat "/:" buffer-file-name))))))
6670 (`unquote-then-quote
6671 (let ((buffer-file-name (substring buffer-file-name 2)))
6672 (apply operation arguments)))
6674 (apply operation arguments)))))
6676 ;; Symbolic modes and read-file-modes.
6678 (defun file-modes-char-to-who (char)
6679 "Convert CHAR to a numeric bit-mask for extracting mode bits.
6680 CHAR is in [ugoa] and represents the category of users (Owner, Group,
6681 Others, or All) for whom to produce the mask.
6682 The bit-mask that is returned extracts from mode bits the access rights
6683 for the specified category of users."
6684 (cond ((= char ?u) #o4700)
6685 ((= char ?g) #o2070)
6686 ((= char ?o) #o1007)
6687 ((= char ?a) #o7777)
6688 (t (error "%c: bad `who' character" char))))
6690 (defun file-modes-char-to-right (char &optional from)
6691 "Convert CHAR to a numeric value of mode bits.
6692 CHAR is in [rwxXstugo] and represents symbolic access permissions.
6693 If CHAR is in [Xugo], the value is taken from FROM (or 0 if omitted)."
6694 (or from (setq from 0))
6695 (cond ((= char ?r) #o0444)
6696 ((= char ?w) #o0222)
6697 ((= char ?x) #o0111)
6698 ((= char ?s) #o1000)
6699 ((= char ?t) #o6000)
6700 ;; Rights relative to the previous file modes.
6701 ((= char ?X) (if (= (logand from #o111) 0) 0 #o0111))
6702 ((= char ?u) (let ((uright (logand #o4700 from)))
6703 (+ uright (/ uright #o10) (/ uright #o100))))
6704 ((= char ?g) (let ((gright (logand #o2070 from)))
6705 (+ gright (/ gright #o10) (* gright #o10))))
6706 ((= char ?o) (let ((oright (logand #o1007 from)))
6707 (+ oright (* oright #o10) (* oright #o100))))
6708 (t (error "%c: bad right character" char))))
6710 (defun file-modes-rights-to-number (rights who-mask &optional from)
6711 "Convert a symbolic mode string specification to an equivalent number.
6712 RIGHTS is the symbolic mode spec, it should match \"([+=-][rwxXstugo]*)+\".
6713 WHO-MASK is the bit-mask specifying the category of users to which to
6714 apply the access permissions. See `file-modes-char-to-who'.
6715 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6716 RIGHTS request to add, remove, or set permissions based on existing ones,
6717 as in \"og+rX-w\"."
6718 (let* ((num-rights (or from 0))
6719 (list-rights (string-to-list rights))
6720 (op (pop list-rights)))
6721 (while (memq op '(?+ ?- ?=))
6722 (let ((num-right 0)
6723 char-right)
6724 (while (memq (setq char-right (pop list-rights))
6725 '(?r ?w ?x ?X ?s ?t ?u ?g ?o))
6726 (setq num-right
6727 (logior num-right
6728 (file-modes-char-to-right char-right num-rights))))
6729 (setq num-right (logand who-mask num-right)
6730 num-rights
6731 (cond ((= op ?+) (logior num-rights num-right))
6732 ((= op ?-) (logand num-rights (lognot num-right)))
6733 (t (logior (logand num-rights (lognot who-mask)) num-right)))
6734 op char-right)))
6735 num-rights))
6737 (defun file-modes-symbolic-to-number (modes &optional from)
6738 "Convert symbolic file modes to numeric file modes.
6739 MODES is the string to convert, it should match
6740 \"[ugoa]*([+-=][rwxXstugo]*)+,...\".
6741 See Info node `(coreutils)File permissions' for more information on this
6742 notation.
6743 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6744 MODES request to add, remove, or set permissions based on existing ones,
6745 as in \"og+rX-w\"."
6746 (save-match-data
6747 (let ((case-fold-search nil)
6748 (num-modes (or from 0)))
6749 (while (/= (string-to-char modes) 0)
6750 (if (string-match "^\\([ugoa]*\\)\\([+=-][rwxXstugo]*\\)+\\(,\\|\\)" modes)
6751 (let ((num-who (apply 'logior 0
6752 (mapcar 'file-modes-char-to-who
6753 (match-string 1 modes)))))
6754 (when (= num-who 0)
6755 (setq num-who (default-file-modes)))
6756 (setq num-modes
6757 (file-modes-rights-to-number (substring modes (match-end 1))
6758 num-who num-modes)
6759 modes (substring modes (match-end 3))))
6760 (error "Parse error in modes near `%s'" (substring modes 0))))
6761 num-modes)))
6763 (defun read-file-modes (&optional prompt orig-file)
6764 "Read file modes in octal or symbolic notation and return its numeric value.
6765 PROMPT is used as the prompt, default to `File modes (octal or symbolic): '.
6766 ORIG-FILE is the name of a file on whose mode bits to base returned
6767 permissions if what user types requests to add, remove, or set permissions
6768 based on existing mode bits, as in \"og+rX-w\"."
6769 (let* ((modes (or (if orig-file (file-modes orig-file) 0)
6770 (error "File not found")))
6771 (modestr (and (stringp orig-file)
6772 (nth 8 (file-attributes orig-file))))
6773 (default
6774 (and (stringp modestr)
6775 (string-match "^.\\(...\\)\\(...\\)\\(...\\)$" modestr)
6776 (replace-regexp-in-string
6777 "-" ""
6778 (format "u=%s,g=%s,o=%s"
6779 (match-string 1 modestr)
6780 (match-string 2 modestr)
6781 (match-string 3 modestr)))))
6782 (value (read-string (or prompt "File modes (octal or symbolic): ")
6783 nil nil default)))
6784 (save-match-data
6785 (if (string-match "^[0-7]+" value)
6786 (string-to-number value 8)
6787 (file-modes-symbolic-to-number value modes)))))
6789 (define-obsolete-variable-alias 'cache-long-line-scans
6790 'cache-long-scans "24.4")
6792 ;; Trashcan handling.
6793 (defcustom trash-directory nil
6794 "Directory for `move-file-to-trash' to move files and directories to.
6795 This directory is only used when the function `system-move-file-to-trash'
6796 is not defined.
6797 Relative paths are interpreted relative to `default-directory'.
6798 If the value is nil, Emacs uses a freedesktop.org-style trashcan."
6799 :type '(choice (const nil) directory)
6800 :group 'auto-save
6801 :version "23.2")
6803 (defvar trash--hexify-table)
6805 (declare-function system-move-file-to-trash "w32fns.c" (filename))
6807 (defun move-file-to-trash (filename)
6808 "Move the file (or directory) named FILENAME to the trash.
6809 When `delete-by-moving-to-trash' is non-nil, this function is
6810 called by `delete-file' and `delete-directory' instead of
6811 deleting files outright.
6813 If the function `system-move-file-to-trash' is defined, call it
6814 with FILENAME as an argument.
6815 Otherwise, if `trash-directory' is non-nil, move FILENAME to that
6816 directory.
6817 Otherwise, trash FILENAME using the freedesktop.org conventions,
6818 like the GNOME, KDE and XFCE desktop environments. Emacs only
6819 moves files to \"home trash\", ignoring per-volume trashcans."
6820 (interactive "fMove file to trash: ")
6821 (cond (trash-directory
6822 ;; If `trash-directory' is non-nil, move the file there.
6823 (let* ((trash-dir (expand-file-name trash-directory))
6824 (fn (directory-file-name (expand-file-name filename)))
6825 (new-fn (expand-file-name (file-name-nondirectory fn)
6826 trash-dir)))
6827 ;; We can't trash a parent directory of trash-directory.
6828 (if (string-prefix-p fn trash-dir)
6829 (error "Trash directory `%s' is a subdirectory of `%s'"
6830 trash-dir filename))
6831 (unless (file-directory-p trash-dir)
6832 (make-directory trash-dir t))
6833 ;; Ensure that the trashed file-name is unique.
6834 (if (file-exists-p new-fn)
6835 (let ((version-control t)
6836 (backup-directory-alist nil))
6837 (setq new-fn (car (find-backup-file-name new-fn)))))
6838 (let (delete-by-moving-to-trash)
6839 (rename-file fn new-fn))))
6840 ;; If `system-move-file-to-trash' is defined, use it.
6841 ((fboundp 'system-move-file-to-trash)
6842 (system-move-file-to-trash filename))
6843 ;; Otherwise, use the freedesktop.org method, as specified at
6844 ;; http://freedesktop.org/wiki/Specifications/trash-spec
6846 (let* ((xdg-data-dir
6847 (directory-file-name
6848 (expand-file-name "Trash"
6849 (or (getenv "XDG_DATA_HOME")
6850 "~/.local/share"))))
6851 (trash-files-dir (expand-file-name "files" xdg-data-dir))
6852 (trash-info-dir (expand-file-name "info" xdg-data-dir))
6853 (fn (directory-file-name (expand-file-name filename))))
6855 ;; Check if we have permissions to delete.
6856 (unless (file-writable-p (directory-file-name
6857 (file-name-directory fn)))
6858 (error "Cannot move %s to trash: Permission denied" filename))
6859 ;; The trashed file cannot be the trash dir or its parent.
6860 (if (string-prefix-p fn trash-files-dir)
6861 (error "The trash directory %s is a subdirectory of %s"
6862 trash-files-dir filename))
6863 (if (string-prefix-p fn trash-info-dir)
6864 (error "The trash directory %s is a subdirectory of %s"
6865 trash-info-dir filename))
6867 ;; Ensure that the trash directory exists; otherwise, create it.
6868 (let ((saved-default-file-modes (default-file-modes)))
6869 (unwind-protect
6870 (progn
6871 (set-default-file-modes #o700)
6872 (unless (file-exists-p trash-files-dir)
6873 (make-directory trash-files-dir t))
6874 (unless (file-exists-p trash-info-dir)
6875 (make-directory trash-info-dir t)))
6876 (set-default-file-modes saved-default-file-modes)))
6878 ;; Try to move to trash with .trashinfo undo information
6879 (save-excursion
6880 (with-temp-buffer
6881 (set-buffer-file-coding-system 'utf-8-unix)
6882 (insert "[Trash Info]\nPath=")
6883 ;; Perform url-encoding on FN. For compatibility with
6884 ;; other programs (e.g. XFCE Thunar), allow literal "/"
6885 ;; for path separators.
6886 (unless (boundp 'trash--hexify-table)
6887 (setq trash--hexify-table (make-vector 256 nil))
6888 (let ((unreserved-chars
6889 (list ?/ ?a ?b ?c ?d ?e ?f ?g ?h ?i ?j ?k ?l ?m
6890 ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A
6891 ?B ?C ?D ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O
6892 ?P ?Q ?R ?S ?T ?U ?V ?W ?X ?Y ?Z ?0 ?1 ?2
6893 ?3 ?4 ?5 ?6 ?7 ?8 ?9 ?- ?_ ?. ?! ?~ ?* ?'
6894 ?\( ?\))))
6895 (dotimes (byte 256)
6896 (aset trash--hexify-table byte
6897 (if (memq byte unreserved-chars)
6898 (char-to-string byte)
6899 (format "%%%02x" byte))))))
6900 (mapc (lambda (byte)
6901 (insert (aref trash--hexify-table byte)))
6902 (if (multibyte-string-p fn)
6903 (encode-coding-string fn 'utf-8)
6904 fn))
6905 (insert "\nDeletionDate="
6906 (format-time-string "%Y-%m-%dT%T")
6907 "\n")
6909 ;; Attempt to make .trashinfo file, trying up to 5
6910 ;; times. The .trashinfo file is opened with O_EXCL,
6911 ;; as per trash-spec 0.7, even if that can be a problem
6912 ;; on old NFS versions...
6913 (let* ((tries 5)
6914 (base-fn (expand-file-name
6915 (file-name-nondirectory fn)
6916 trash-files-dir))
6917 (new-fn base-fn)
6918 success info-fn)
6919 (while (> tries 0)
6920 (setq info-fn (expand-file-name
6921 (concat (file-name-nondirectory new-fn)
6922 ".trashinfo")
6923 trash-info-dir))
6924 (unless (condition-case nil
6925 (progn
6926 (write-region nil nil info-fn nil
6927 'quiet info-fn 'excl)
6928 (setq tries 0 success t))
6929 (file-already-exists nil))
6930 (setq tries (1- tries))
6931 ;; Uniquify new-fn. (Some file managers do not
6932 ;; like Emacs-style backup file names---e.g. bug
6933 ;; 170956 in Konqueror bug tracker.)
6934 (setq new-fn (make-temp-name (concat base-fn "_")))))
6935 (unless success
6936 (error "Cannot move %s to trash: Lock failed" filename))
6938 ;; Finally, try to move the file to the trashcan.
6939 (let ((delete-by-moving-to-trash nil))
6940 (rename-file fn new-fn)))))))))
6943 (define-key ctl-x-map "\C-f" 'find-file)
6944 (define-key ctl-x-map "\C-r" 'find-file-read-only)
6945 (define-key ctl-x-map "\C-v" 'find-alternate-file)
6946 (define-key ctl-x-map "\C-s" 'save-buffer)
6947 (define-key ctl-x-map "s" 'save-some-buffers)
6948 (define-key ctl-x-map "\C-w" 'write-file)
6949 (define-key ctl-x-map "i" 'insert-file)
6950 (define-key esc-map "~" 'not-modified)
6951 (define-key ctl-x-map "\C-d" 'list-directory)
6952 (define-key ctl-x-map "\C-c" 'save-buffers-kill-terminal)
6953 (define-key ctl-x-map "\C-q" 'read-only-mode)
6955 (define-key ctl-x-4-map "f" 'find-file-other-window)
6956 (define-key ctl-x-4-map "r" 'find-file-read-only-other-window)
6957 (define-key ctl-x-4-map "\C-f" 'find-file-other-window)
6958 (define-key ctl-x-4-map "b" 'switch-to-buffer-other-window)
6959 (define-key ctl-x-4-map "\C-o" 'display-buffer)
6961 (define-key ctl-x-5-map "b" 'switch-to-buffer-other-frame)
6962 (define-key ctl-x-5-map "f" 'find-file-other-frame)
6963 (define-key ctl-x-5-map "\C-f" 'find-file-other-frame)
6964 (define-key ctl-x-5-map "r" 'find-file-read-only-other-frame)
6965 (define-key ctl-x-5-map "\C-o" 'display-buffer-other-frame)
6967 ;;; files.el ends here