| blob | 10c0cea506453680bb5ee063d49d426bd9ee52e8 |
1 ;;; files.el --- file input and output commands for Emacs -*- lexical-binding:t -*-
3 ;; Copyright (C) 1985-1987, 1992-2015 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:
34 "Backups of edited data files."
38 "Finding files."
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."
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
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."
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'."
96 ;; Do this so that local variables based on the file name
97 ;; are not overridden by the major mode.
99 "If non-nil, backups will be inhibited.
100 This variable is intended for use by making it local to a buffer,
105 "Non-nil means always use copying to create backup files.
106 See documentation of variable `make-backup-files'."
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."
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."
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."
142 "Predicate that looks at a file name and decides whether to make backups.
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."
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."
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."
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."
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.
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."
205 ;; The system null device. (Should reference NULL_DEVICE from C.)
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'."
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'."
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."
286 "When cleaning directory, number of versions to keep."
292 "If t, delete excess backup versions silently.
293 If nil, ask confirmation. Any other value prevents any trimming."
300 "Number of oldest versions to keep when a new numbered backup is made."
306 "Number of newest versions to keep when a new numbered backup is made.
307 Includes the new backup. Must be > 0"
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'."
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."
355 "Non-nil says by default do auto-saving of every file-visiting buffer."
361 ;; Don't put "\\2" inside expand-file-name, since it will be
362 ;; transformed to "/2" on DOS/Windows.
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."
392 "Non-nil means save word abbrevs too when files are saved.
393 If `silently', don't ask the user before saving."
398 "Non-nil means allow `find-file' to visit directories.
399 To visit the directory, `find-file' runs `find-directory-functions'."
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."
410 ;; FIXME: also add a hook for `(thing-at-point 'filename)'
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."
418 ;;;It is not useful to make this a local variable.
419 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
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.
428 ;;;It is not useful to make this a local variable.
429 ;;;(put 'find-file-hooks 'permanent-local t)
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."
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
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
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,
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
501 This variable also controls use of major modes specified in
502 a -*- line.
505 always obeys file local variable specifications and the -*- line,
506 and ignores this variable."
507 :risky 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
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.
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
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
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
572 "History list of file names entered in the minibuffer.
574 Maximum length of the history list is determined by the value
578 "If non-nil, avoid messages when saving files.
579 Error-related messages will still be printed, but all other
582 \f
585 "Provides support for ange-ftp host name completion.
586 Runs the usual ange-ftp hook, but only for completion operations."
587 ;; Having this here avoids the need to load ange-ftp when it's not
588 ;; really in use.
594 inhibit-file-name-handlers)))
602 "Convert a standard file's name to something suitable for the OS.
603 This means to guarantee valid names and perhaps to canonicalize
604 certain patterns.
606 FILENAME should be an absolute file name since the conversion rules
607 sometimes vary depending on the position in the file name. E.g. c:/foo
608 is a valid DOS file name, but c:/bar/c:/foo is not.
610 This function's standard definition is trivial; it just returns
611 the argument. However, on Windows and DOS, replace invalid
612 characters. On DOS, make sure to obey the 8.3 limitations.
613 In the native Windows build, turn Cygwin names into native names,
614 and also turn slashes into backslashes if the shell requires it (see
615 `w32-shell-dos-semantics').
617 See Info node `(elisp)Standard File Names' for more details."
622 ;; Replace invalid filename characters with !
626 name))
634 "Read directory name, prompting with PROMPT and completing in directory DIR.
635 Value is not expanded---you must call `expand-file-name' yourself.
636 Default name to DEFAULT-DIRNAME if user exits with the same
637 non-empty string that was inserted by this function.
638 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
639 or just DIR if INITIAL is nil.)
640 If the user exits with an empty minibuffer, this function returns
641 an empty string. (This can only happen if the user erased the
642 pre-inserted contents or if `insert-default-directory' is nil.)
643 Fourth arg MUSTMATCH non-nil means require existing directory's name.
644 Non-nil and non-t means also require confirmation after completion.
645 Fifth arg INITIAL specifies text to start with.
646 DIR should be an absolute directory name. It defaults to
647 the value of `default-directory'."
652 dir))
653 mustmatch initial
656 \f
658 "Show the current default directory.
659 With prefix argument INSERT, insert the current default directory
660 at point instead."
667 "Value of the CDPATH environment variable, as a list.
671 "Explode a search path into a list of directory names.
672 Directories are separated by `path-separator' (which is colon in
673 GNU and Unix systems). Substitute environment variables into the
674 resulting list of directory names. For an empty path element (i.e.,
675 a leading or trailing separator, or two adjacent separators), return
676 nil (meaning `default-directory') as the associated list element."
684 "Change current directory to given absolute file name DIR."
685 ;; Put the name into directory syntax now,
686 ;; because otherwise expand-file-name may give some bad results.
688 ;; We used to additionally call abbreviate-file-name here, for an
689 ;; unknown reason. Problem is that most buffers are setup
690 ;; without going through cd-absolute and don't call
691 ;; abbreviate-file-name on their default-directory, so the few that
692 ;; do end up using a superficially different directory.
704 "Make DIR become the current buffer's default directory.
705 If your environment includes a `CDPATH' variable, try each one of
706 that list of directories (separated by occurrences of
707 `path-separator') when resolving a relative directory name.
708 The path separator is colon in GNU and GNU-like systems."
711 ;; FIXME: There's a subtle bug in the completion below. Seems linked
712 ;; to a fundamental difficulty of implementing `predicate' correctly.
713 ;; The manifestation is that TAB may list non-directories in the case where
714 ;; those files also correspond to valid directories (if your cd-path is (A/
715 ;; B/) and you have A/a a file and B/a a directory, then both `a' and `a/'
716 ;; will be listed as valid completions).
717 ;; This is because `a' (listed because of A/a) is indeed a valid choice
718 ;; (which will lead to the use of B/a).
723 cd-path nil))
732 default-directory default-directory
733 t))))
743 "Return non-nil if NAME ends with a directory separator character."
753 "Return list of all files under DIR that have file names matching REGEXP.
755 order, and files from each directory are sorted in alphabetical order.
756 Each file name appears in the returned list in its absolute form.
757 Optional argument INCLUDE-DIRECTORIES non-nil means also include in the
758 output directories whose names match REGEXP."
761 ;; When DIR is "/", remote file names like "/method:" could
762 ;; also be offered. We shall suppress them.
770 ;; Don't follow symlinks to other directories.
774 full-file regexp include-directories))))
785 "Load the Lisp file named FILE."
786 ;; This is a case where .elc and .so/.dll make a lot of sense.
790 completion-ignored-extensions))))
795 "Search for FILENAME through PATH.
796 If found, return the absolute file name of FILENAME; otherwise
797 return nil.
798 PATH should be a list of directories to look in, like the lists in
799 `exec-path' or `load-path'.
800 If SUFFIXES is non-nil, it should be a list of suffixes to append to
803 If non-nil, PREDICATE is used instead of `file-readable-p'.
805 This function will normally skip directories, so if you want it to find
806 directories, make sure the PREDICATE function returns `dir-ok' for them.
808 PREDICATE can also be an integer to pass to the `access' system call,
809 in which case file-name handlers are ignored. This usage is deprecated.
810 For compatibility, PREDICATE can also be one of the symbols
811 `executable', `readable', `writable', or `exists', or a list of
812 one or more of those symbols."
823 "Do completion for file names passed to `locate-file'."
826 ;; FIXME: maybe we should use completion-file-name-table instead,
827 ;; tho at least for `load', the arg is passed through
828 ;; substitute-in-file-name for historical reasons.
838 ;; If we have files like "foo.el" and "foo.elc", we could load one of
839 ;; them with "foo.el", "foo.elc", or "foo", where just "foo" is the
840 ;; preferred way. So if we list all 3, that gives a lot of redundant
841 ;; entries for the poor soul looking just for "foo". OTOH, sometimes
842 ;; the user does want to pay attention to the extension. We try to
843 ;; diffuse this tension by stripping the suffix, except when the
844 ;; result is a single element (i.e. usually we only list "foo" unless
845 ;; it's the only remaining element in the list, in which case we do
846 ;; list "foo", "foo.elc" and "foo.el").
857 string-file dir))
862 ;; Switching from names to names+fullnames creates a non-monotonicity
863 ;; which can cause problems with things like partial-completion.
864 ;; To minimize the problem, filter out completion-regexp-list, so that
865 ;; M-x load-library RET t/x.e TAB finds some files. Also remove elements
866 ;; from `names' which only matched `string' when they still had
867 ;; their suffix.
869 ;; Remove duplicates of the first element, so that we can easily check
870 ;; if `names' really only contains a single element.
873 ;; There's no more than one matching non-suffixed element, so expand
874 ;; the list by adding the suffixed elements as well.
877 string-dir names string-file pred action)))))
880 "Do completion for file names passed to `locate-file'.
881 PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
885 string nil action))
889 "Regexp of directory names which stop the search in `locate-dominating-file'.
890 Any directory whose name matches this regexp will be treated like
891 a kind of root directory by `locate-dominating-file' which will stop its search
892 when it bumps into it.
893 The default regexp prevents fruitless and time-consuming attempts to find
894 special files in directories in which filenames are interpreted as hostnames,
897 ;; (defun locate-dominating-files (file regexp)
898 ;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
899 ;; Stop at the first parent where a matching file is found and return the list
900 ;; of files that that match in this directory."
901 ;; (catch 'found
902 ;; ;; `user' is not initialized yet because `file' may not exist, so we may
903 ;; ;; have to walk up part of the hierarchy before we find the "initial UID".
904 ;; (let ((user nil)
905 ;; ;; Abbreviate, so as to stop when we cross ~/.
906 ;; (dir (abbreviate-file-name (file-name-as-directory file)))
907 ;; files)
908 ;; (while (and dir
909 ;; ;; As a heuristic, we stop looking up the hierarchy of
910 ;; ;; directories as soon as we find a directory belonging to
911 ;; ;; another user. This should save us from looking in
912 ;; ;; things like /net and /afs. This assumes that all the
913 ;; ;; files inside a project belong to the same user.
914 ;; (let ((prev-user user))
915 ;; (setq user (nth 2 (file-attributes dir)))
916 ;; (or (null prev-user) (equal user prev-user))))
917 ;; (if (setq files (condition-case nil
918 ;; (directory-files dir 'full regexp 'nosort)
919 ;; (error nil)))
920 ;; (throw 'found files)
921 ;; (if (equal dir
922 ;; (setq dir (file-name-directory
923 ;; (directory-file-name dir))))
924 ;; (setq dir nil))))
925 ;; nil)))
928 "Look up the directory hierarchy from FILE for a directory containing NAME.
929 Stop at the first parent directory containing a file NAME,
930 and return the directory. Return nil if not found.
931 Instead of a string, NAME can also be a predicate taking one argument
932 \(a directory) and returning a non-nil value if that directory is the one for
933 which we're looking."
934 ;; We used to use the above locate-dominating-files code, but the
935 ;; directory-files call is very costly, so we're much better off doing
936 ;; multiple calls using the code in here.
937 ;;
938 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
939 ;; `name' in /home or in /.
942 ;; `user' is not initialized outside the loop because
943 ;; `file' may not exist, so we may have to walk up part of the
944 ;; hierarchy before we find the "initial UID". Note: currently unused
945 ;; (user nil)
946 try)
949 ;; FIXME: Disabled this heuristic because it is sometimes
950 ;; inappropriate.
951 ;; As a heuristic, we stop looking up the hierarchy of
952 ;; directories as soon as we find a directory belonging
953 ;; to another user. This should save us from looking in
954 ;; things like /net and /afs. This assumes that all the
955 ;; files inside a project belong to the same user.
956 ;; (let ((prev-user user))
957 ;; (setq user (nth 2 (file-attributes file)))
958 ;; (and prev-user (not (equal user prev-user))))
970 "Non-nil means warn if cannot access `user-emacs-directory'.
971 Set this to nil at your own risk..."
977 "Return an absolute per-user Emacs-specific file name.
978 If NEW-NAME exists in `user-emacs-directory', return it.
979 Else if OLD-NAME is non-nil and ~/OLD-NAME exists, return ~/OLD-NAME.
980 Else return NEW-NAME in `user-emacs-directory', creating the
981 directory if it does not exist."
989 at-home
990 ;; Make sure `user-emacs-directory' exists,
991 ;; unless we're in batch mode or dumping Emacs.
993 purify-flag
1003 user-emacs-directory-warning
1005 ;; Only warn once per Emacs session.
1009 Unable to %s `user-emacs-directory' (%s).
1010 Any data that would normally be written there may be lost!
1011 If you never want to see this message again,
1012 customize the variable `user-emacs-directory-warning'."
1013 errtype user-emacs-directory)))))
1014 bestname))))
1018 "Search for COMMAND in `exec-path' and return the absolute file name.
1019 Return nil if COMMAND is not found anywhere in `exec-path'."
1020 ;; Use 1 rather than file-executable-p to better match the behavior of
1021 ;; call-process.
1025 "Load the Emacs Lisp library named LIBRARY.
1026 This is an interface to the function `load'. LIBRARY is searched
1027 for in `load-path', both with and without `load-suffixes' (as
1028 well as `load-file-rep-suffixes').
1030 See Info node `(emacs)Lisp Libraries' for more details.
1031 See `load-file' for a different interface to `load'."
1036 load-path
1041 "Test whether FILE specifies a location on a remote system.
1042 A file is considered remote if accessing it is likely to
1043 be slower or less reliable than accessing local files.
1045 `file-remote-p' never opens a new remote connection. It can
1046 only reuse a connection that is already open.
1048 Return nil or a string identifying the remote connection
1049 \(ideally a prefix of FILE). Return nil if FILE is a relative
1050 file name.
1052 When IDENTIFICATION is nil, the returned string is a complete
1053 remote identifier: with components method, user, and host. The
1054 components are those present in FILE, with defaults filled in for
1055 any that are missing.
1057 IDENTIFICATION can specify which part of the identification to
1058 return. IDENTIFICATION can be the symbol `method', `user',
1059 `host', or `localname'. Any other value is handled like nil and
1060 means to return the complete identification. The string returned
1061 for IDENTIFICATION `localname' can differ depending on whether
1062 there is an existing connection.
1064 If CONNECTED is non-nil, return an identification only if FILE is
1065 located on a remote system and a connection is established to
1066 that remote system.
1068 Tip: You can use this expansion of remote identifier components
1069 to derive a new remote file name from an existing one. For
1075 same remote identifier as FILE but expanded; a name such as
1080 nil)))
1082 ;; Probably this entire variable should be obsolete now, in favor of
1083 ;; something Tramp-related (?). It is not used in many places.
1084 ;; It's not clear what the best file for this to be in is, but given
1085 ;; it uses custom-initialize-delay, it is easier if it is preloaded
1086 ;; rather than autoloaded.
1088 ;; This used to try various hard-coded places for remsh, rsh, and
1089 ;; rcmd, trying to guess based on location whether "rsh" was
1090 ;; "restricted shell" or "remote shell", but I don't see the point
1091 ;; in this day and age. Almost everyone will use ssh, and have
1092 ;; whatever command they want to use in PATH.
1099 "Program to use to execute commands on a remote host (e.g. ssh or rsh)."
1106 "Whether to use the remote file-name cache for read access.
1107 When nil, never expire cached values (caution)
1108 When t, never use the cache (safe, but may be slow)
1109 A number means use cached values for that amount of seconds since caching.
1111 The attributes of remote files are cached for better performance.
1112 If they are changed outside of Emacs's control, the cached values
1113 become invalid, and must be reread. If you are sure that nothing
1114 other than Emacs changes the files, you can set this variable to nil.
1116 If a remote file is checked regularly, it might be a good idea to
1117 let-bind this variable to a value less than the interval between
1118 consecutive checks. For example:
1120 (defun display-time-file-nonempty-p (file)
1121 (let ((remote-file-name-inhibit-cache (- display-time-interval 5)))
1122 (and (file-exists-p file)
1123 (< 0 (nth 7 (file-attributes (file-chase-links file)))))))"
1134 "Copy the file FILE into a temporary file on this machine.
1135 Returns the name of the local copy, or nil, if FILE is directly
1136 accessible."
1137 ;; This formerly had an optional BUFFER argument that wasn't used by
1138 ;; anything.
1142 nil)))
1145 "Return the truename of FILENAME.
1146 If FILENAME is not absolute, first expands it against `default-directory'.
1147 The truename of a file name is found by chasing symbolic links
1148 both at the level of the file and at the level of the directories
1149 containing it, until no links are left at any level.
1152 ;; COUNTER and PREV-DIRS are only used in recursive calls.
1153 ;; COUNTER can be a cons cell whose car is the count of how many
1154 ;; more links to chase before getting an error.
1155 ;; PREV-DIRS can be a cons cell whose car is an alist
1156 ;; of truenames we've just recently computed.
1170 ;; For speed, remove the ange-ftp completion handler from the list.
1171 ;; We know it's not needed here.
1172 ;; For even more speed, do this only on the outermost call.
1179 ;; andrewi@harlequin.co.uk - on Windows, there is an issue with
1180 ;; case differences being ignored by the OS, and short "8.3 DOS"
1181 ;; name aliases existing for all files. (The short names are not
1182 ;; reported by directory-files, but can be used to refer to files.)
1183 ;; It seems appropriate for file-truename to resolve these issues in
1184 ;; the most natural way, which on Windows is to call the function
1185 ;; `w32-long-file-name' - this returns the exact name of a file as
1186 ;; it is stored on disk (expanding short name aliases with the full
1187 ;; name in the process).
1190 ;; If filename exists, use its long name. If it doesn't
1191 ;; exist, the recursion below on the directory of filename
1192 ;; will drill down until we find a directory that exists,
1193 ;; and use the long name of that, with the extra
1194 ;; non-existent path components concatenated.
1199 ;; If this file directly leads to a link, process that iteratively
1200 ;; so that we don't use lots of stack.
1206 ;; For file name that has a special handler, call handler.
1207 ;; This is so that ange-ftp can save time by doing a no-op.
1210 done t)
1212 target dirfile)
1213 ;; Get the truename of the directory.
1215 ;; If these are equal, we have the (or a) root directory.
1219 ;; If this is the same dir we last got the truename for,
1220 ;; save time--don't recalculate.
1230 done t)
1233 done t)
1234 ;; Put it back on the file name.
1236 ;; Is the file name the name of a link?
1239 ;; Yes => chase that link, then start all over
1240 ;; since the link may point to a directory name that uses links.
1241 ;; We can't safely use expand-file-name here
1242 ;; since target might look like foo/../bar where foo
1243 ;; is itself a link. Instead, we handle . and .. above.
1246 target
1248 done nil)
1249 ;; No, we are done!
1251 filename))
1254 "Chase links in FILENAME until a name that is not a link.
1255 Unlike `file-truename', this does not check whether a parent
1256 directory name is a symbolic link.
1257 If the optional argument LIMIT is a number,
1258 it means chase no more than that many links and then stop."
1266 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
1269 ;; Handle `..' by hand, since it needs to work in the
1270 ;; target of any directory symlink.
1271 ;; This code is not quite complete; it does not handle
1272 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
1276 ;; Chase links in the default dir of the symlink.
1280 ;; Now find the parent of that dir.
1284 newname))
1286 ;; A handy function to display file sizes in human-readable form.
1287 ;; See http://en.wikipedia.org/wiki/Kibibyte for the reference.
1289 "Produce a string showing FILE-SIZE in human-readable form.
1291 Optional second argument FLAVOR controls the units and the display format:
1293 If FLAVOR is nil or omitted, each kilobyte is 1024 bytes and the produced
1295 If FLAVOR is `si', each kilobyte is 1000 bytes and the produced suffixes
1297 If FLAVOR is `iec', each kilobyte is 1024 bytes and the produced suffixes
1300 1024.0
1303 ;; none, kilo, mega, giga, tera, peta, exa, zetta, yotta
1309 "%.1f%s%s"
1311 file-size
1313 "K"
1318 "Create a temporary file.
1319 The returned file name (created by appending some random characters at the end
1320 of PREFIX, and expanding against `temporary-file-directory' if necessary),
1321 is guaranteed to point to a newly created empty file.
1322 You can then use `write-region' to write new data into the file.
1324 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1326 If SUFFIX is non-nil, add that at the end of the file name."
1327 ;; Create temp files with strict access rights. It's easy to
1328 ;; loosen them later, whereas it's impossible to close the
1329 ;; time-window of loose permissions otherwise.
1338 temporary-file-directory)
1340 temporary-file-directory))))
1346 nil)
1348 ;; the file was somehow created by someone else between
1349 ;; `make-temp-name' and `write-region', let's try again.
1350 nil)
1351 file)))
1354 "Change the encoding of FILE's name from CODING to NEW-CODING.
1355 The value is a new name of FILE.
1356 Signals a `file-already-exists' error if a file of the new name
1357 already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
1358 is non-nil. A number as fourth arg means request confirmation if
1359 the new name already exists. This is what happens in interactive
1360 use with M-x."
1363 default-file-name-coding-system))
1365 from-coding to-coding)
1367 ;; We provide the default coding only when it seems that
1368 ;; the filename is correctly decoded by the default
1369 ;; coding.
1375 filename default-coding)
1376 default-coding))
1380 ;; We provide the default coding only when a user is going to
1381 ;; change the encoding not from the default coding.
1385 filename from-coding)))
1388 filename from-coding default-coding)
1389 default-coding)))
1393 default-file-name-coding-system))
1394 ;; FILE should have been decoded by DEFAULT-CODING.
1398 ;; Suppress further encoding.
1403 newname))
1404 \f
1406 "Whether confirmation is requested before visiting a new file or buffer.
1407 If nil, confirmation is not requested.
1408 If the value is `after-completion', confirmation is only
1409 requested if the user called `minibuffer-complete' right before
1410 `minibuffer-complete-and-exit'.
1411 Any other non-nil value means to request confirmation.
1413 This affects commands like `switch-to-buffer' and `find-file'."
1421 "Whether to request confirmation before visiting a new file or buffer.
1422 The variable `confirm-nonexistent-file-or-buffer' determines the
1423 return value, which may be passed as the REQUIRE-MATCH arg to
1424 `read-buffer' or `find-file-read-args'."
1432 "Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
1433 FUN can also be (:append FUN1), in which case FUN1 is appended to
1434 `minibuffer-setup-hook'.
1436 BODY should use the minibuffer at most once.
1437 Recursive uses of the minibuffer are unaffected (FUN is not
1438 called additional times).
1440 This macro actually adds an auxiliary function that calls FUN,
1441 rather than FUN itself, to `minibuffer-setup-hook'."
1452 ;; Clear out this hook so it does not interfere
1453 ;; with any recursive minibuffer usage.
1464 t))
1467 "Edit file FILENAME.
1468 Switch to a buffer visiting file FILENAME,
1469 creating one if none already exists.
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 You can visit files on remote machines by specifying something
1475 like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
1476 also visit local files as a different user by specifying
1477 /sudo::FILE for the file name.
1478 See the Info node `(tramp)File name Syntax' in the Tramp Info
1479 manual, for more about this.
1481 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1482 expand wildcards (if any) and visit multiple files. You can
1483 suppress wildcard expansion by setting `find-file-wildcards' to nil.
1485 To visit a file without any kind of conversion and without
1496 "Edit file FILENAME, in another window.
1499 an existing one. See the function `display-buffer'.
1501 Interactively, the default if you just type RET is the current directory,
1502 but the visited file name is available through the minibuffer history:
1503 type M-n to pull it into the minibuffer.
1505 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1506 expand wildcards (if any) and visit multiple files."
1516 value)
1520 "Edit file FILENAME, in another frame.
1523 an existing one. See the function `display-buffer'.
1525 Interactively, the default if you just type RET is the current directory,
1526 but the visited file name is available through the minibuffer history:
1527 type M-n to pull it into the minibuffer.
1529 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1530 expand wildcards (if any) and visit multiple files."
1540 value)
1544 "Edit the existing file FILENAME.
1546 file names with wildcards."
1563 value))
1566 "Edit file FILENAME but don't allow changes.
1575 "Edit file FILENAME in another window but don't allow changes.
1584 "Edit file FILENAME in another frame but don't allow changes.
1593 "Find file FILENAME as a replacement for the file in the next window.
1594 This command does not select that window.
1598 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1599 expand wildcards (if any) and replace the file with multiple files."
1610 "Find alternate file: " file-dir nil
1612 t))))
1619 ;; Defined and used in buffer.c, but not as a DEFVAR_LISP.
1621 "Hook run when a buffer is killed.
1622 The buffer being killed is current while the hook is running.
1623 See `kill-buffer'.
1625 Note: Be careful with let-binding this hook considering it is
1629 "Find file FILENAME, select its buffer, kill previous buffer.
1630 If the current buffer now contains an empty file that you just visited
1631 \(presumably by mistake), use this command to visit the file you really want.
1635 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1636 expand wildcards (if any) and replace the file with multiple files.
1638 If the current buffer is an indirect buffer, or the base buffer
1639 for one or more indirect buffers, the other buffer(s) are not
1640 killed."
1649 "Find alternate file: " file-dir nil
1651 t)))
1665 ;; Run `kill-buffer-hook' here. It needs to happen before
1666 ;; variables like `buffer-file-name' etc are set to nil below,
1667 ;; because some of the hooks that could be invoked
1668 ;; (e.g., `save-place-to-alist') depend on those variables.
1669 ;;
1670 ;; Note that `kill-buffer-hook' is not what queries whether to
1671 ;; save a modified buffer visiting a file. Rather, `kill-buffer'
1672 ;; asks that itself. Thus, there's no need to temporarily do
1673 ;; `(set-buffer-modified-p nil)' before running this hook.
1675 ;; Okay, now we can end-of-life the old buffer.
1682 ;; This prevents us from finding the same buffer
1683 ;; if we specified the same file again.
1687 ;; Likewise for dired buffers.
1691 ;; This executes if find-file gets an error
1692 ;; and does not really find anything.
1693 ;; We put things back as they were.
1694 ;; If find-file actually finds something, we kill obuf below.
1703 ;; We already ran these; don't run them again.
1706 \f
1707 ;; FIXME we really need to fold the uniquify stuff in here by default,
1708 ;; not using advice, and add it to the doc string.
1710 "Create a suitably named buffer for visiting FILENAME, and return it.
1711 FILENAME (sans directory) is used unchanged if that name is free;
1712 otherwise a string <2> or <3> or ... is appended to get an unused name.
1714 Emacs treats buffers whose names begin with a space as internal buffers.
1715 To avoid confusion when visiting a file whose name begins with a space,
1722 lastname))))
1725 "Create and return a buffer with a name based on NAME.
1726 Choose the buffer's name using `generate-new-buffer-name'."
1730 "Regexp to match the automounter prefix in a directory name."
1739 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1741 home directory is a root directory) and removes automounter prefixes
1742 \(see the variable `automount-dir-prefix')."
1743 ;; Get rid of the prefixes added by the automounter.
1750 ;; Avoid treating /home/foo as /home/Foo during `~' substitution.
1751 ;; To fix this right, we need a `file-name-case-sensitive-p'
1752 ;; function, but we don't have that yet, so just guess.
1755 ;; If any elt of directory-abbrev-alist matches this name,
1756 ;; abbreviate accordingly.
1762 ;; Compute and save the abbreviated homedir name.
1763 ;; We defer computing this until the first time it's needed, to
1764 ;; give time for directory-abbrev-alist to be set properly.
1765 ;; We include a slash at the end, to avoid spurious matches
1766 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1773 ;; If FILENAME starts with the abbreviated homedir,
1774 ;; make it start with `~' instead.
1776 ;; If the home dir is just /, don't change it.
1779 ;; MS-DOS root directories can come with a drive letter;
1780 ;; Novell Netware allows drive letters beyond `Z:'.
1788 filename)))
1791 "Return the buffer visiting file FILENAME (a string).
1792 This is like `get-file-buffer', except that it checks for any buffer
1793 visiting the same file, possibly under a different name.
1794 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1795 and others are ignored.
1796 If there is no such live buffer, return nil."
1809 found)
1819 ;; Verify this buffer's file number
1820 ;; still belongs to its file.
1823 attributes)
1827 found))))
1828 \f
1830 "Non-nil means file-visiting commands should handle wildcards.
1831 For example, if you specify `*.c', that would visit all the files
1832 whose names match the pattern."
1838 "Non-nil means suppress warning messages for symlinked files.
1839 When nil, Emacs prints a warning when visiting a file that is already
1840 visited, but with a different name. Setting this option to t
1841 suppresses this warning."
1847 "Maximum size of file above which a confirmation is requested.
1848 When nil, never request confirmation."
1855 "Warn if file size exceeds this percentage of available free memory.
1856 When nil, never issue warning. Beware: This probably doesn't do what you
1864 "If file SIZE larger than `large-file-warning-threshold', allow user to abort.
1865 OP-TYPE specifies the file operation being performed (for message to user)."
1874 "Warn if an attempt to open file of SIZE bytes may run out of memory."
1884 "You are trying to open a file whose size (%s)
1885 exceeds the %S%% of currently available free memory (%s).
1886 If that fails, try to open it with `find-file-literally'
1887 \(but note that some characters might be displayed incorrectly)."
1889 out-of-memory-warning-percentage
1893 "Like `message', except sometimes don't print to minibuffer.
1894 If the variable `save-silently' is non-nil, the message is not
1895 displayed on the minibuffer."
1900 "Read file FILENAME into a buffer and return the buffer.
1901 If a buffer exists visiting FILENAME, return that one, but
1902 verify that the file has not changed since visited or saved.
1903 The buffer is not selected, just returned to the caller.
1904 Optional second arg NOWARN non-nil means suppress any warning messages.
1905 Optional third arg RAWFILE non-nil means the file is read literally.
1906 Optional fourth arg WILDCARDS non-nil means do wildcard processing
1907 and visit all the matching files. When wildcards are actually
1908 used and expanded, return a list of buffers that are visiting
1909 the various files."
1916 'find-directory-functions
1919 filename)))
1922 find-file-wildcards
1936 ;; Find any buffer for a file which has same truename.
1938 ;; Let user know if there is a buffer with the same truename.
1942 find-file-suppress-same-file-warnings
1946 ;; Optionally also find that buffer.
1949 ;; Check to see if the file looks uncommonly large.
1954 ;; We are using an existing buffer.
1961 ;; Certain files should be reverted automatically
1962 ;; if they have changed on disk and not in the buffer.
1970 found))
1980 "File %s changed on disk. Discard your edits? "
1985 "File %s changed on disk. Discard your edits in %s? "
1993 ;; Check if a formerly read-only file has become
1994 ;; writable and vice versa, but if the buffer agrees
1995 ;; with the new state of the file, that is ok too.
2005 buffer-file-name
2006 new-status new-status)))
2012 nonexistent
2013 ;; It is confusing to ask whether to visit
2014 ;; non-literally if they have the file in
2015 ;; hexl-mode or image-mode.
2021 "The file %s is already visited normally,
2022 and you have edited the buffer. Now you have asked to visit it literally,
2023 meaning no coding system handling, format conversion, or local variables.
2024 Emacs can only visit a file in one way at a time.
2026 Do you want to save the file, and visit it literally instead? "
2027 "The file %s is already visited literally,
2028 meaning no coding system handling, format conversion, or local variables.
2029 You have edited the buffer. Now you have asked to visit the file normally,
2030 but Emacs can only visit a file in one way at a time.
2037 rawfile truename number))
2041 "\
2042 Do you want to discard your changes, and visit the file literally now? "
2043 "\
2046 rawfile truename number)
2052 "The file %s is already visited normally.
2053 You have asked to visit it literally,
2054 meaning no coding system decoding, format conversion, or local variables.
2055 But Emacs can only visit a file in one way at a time.
2057 Do you want to revisit the file literally now? "
2058 "The file %s is already visited literally,
2059 meaning no coding system decoding, format conversion, or local variables.
2060 You have asked to visit it normally,
2061 but Emacs can only visit a file in one way at a time.
2066 rawfile truename number)
2069 ;; Return the buffer we are using.
2070 buf)
2071 ;; Create a new buffer.
2073 ;; find-file-noselect-1 may use a different buffer.
2075 rawfile truename number))))))
2081 ;; Needed in case we are re-visiting the file with a different
2082 ;; text representation.
2099 filename)))
2100 ;; Unconditionally set error
2110 filename)))
2111 ;; Run find-file-not-found-functions until one returns non-nil.
2113 ;; If they fail too, set error.
2115 ;; Record the file's truename, and maybe use that as visited name.
2123 ;; Set buffer's default directory to that of the file.
2125 ;; Turn off backup files for certain file names. Since
2126 ;; this is a permanent local, the major mode won't eliminate it.
2140 \f
2142 "Like `insert-file-contents', but only reads in the file literally.
2143 A buffer may be modified in several ways after reading into the buffer,
2144 due to Emacs features such as format decoding, character code
2145 conversion, `find-file-hook', automatic uncompression, etc.
2147 This function ensures that none of these modifications will take place."
2153 ;; FIXME: Yuck!! We should turn insert-file-contents-literally
2154 ;; into a file operation instead!
2156 inhibit-file-name-handlers))
2163 filename)))
2164 ;; Check whether the file is uncommonly large
2175 "Insert contents of file FILENAME into buffer after point with no conversion.
2177 This function is meant for the user to run interactively.
2178 Don't call it from programs! Use `insert-file-contents-literally' instead.
2179 \(Its calling sequence is different; see its documentation)."
2185 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
2186 This has the `permanent-local' property, which takes effect if you
2191 "Visit file FILENAME with no conversion of any kind.
2192 Format conversion and character code conversion are both disabled,
2193 and multibyte characters are disabled in the resulting buffer.
2194 The major mode used is Fundamental mode regardless of the file name,
2195 and local variable specifications in the file are ignored.
2196 Automatic uncompression and adding a newline at the end of the
2197 file due to `require-final-newline' is also disabled.
2199 You cannot absolutely rely on this function to result in
2200 visiting the file literally. If Emacs already has a buffer
2201 which is visiting the file, you get the existing buffer,
2202 regardless of whether it was created literally or not.
2204 In a Lisp program, if you want to be sure of accessing a file's
2205 contents literally, you should create a temporary buffer and then read
2206 the file contents into it using `insert-file-contents-literally'."
2209 "Find file literally: " nil default-directory
2212 \f
2214 _after-find-file-from-revert-buffer
2215 nomodes)
2216 "Called after finding a file and by the default revert function.
2217 Sets buffer mode, parses local variables.
2218 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
2219 error in reading the file. WARN non-nil means warn if there
2220 exists an auto-save file more recent than the visited file.
2221 NOAUTO means don't mess with auto-save mode.
2222 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER is ignored
2223 \(see `revert-buffer-in-progress-p' for similar functionality).
2224 Fifth arg NOMODES non-nil means don't alter the file's modes.
2225 Finishes by calling the functions in `find-file-hook'
2226 unless NOMODES is non-nil."
2229 nil
2239 "Symbolic link that points to nonexistent file"
2243 ;; No need to warn if buffer is auto-saved
2244 ;; under the name of the visited file.
2246 auto-save-visited-file-name))
2249 buffer-file-name))
2269 ;; Make people do a little extra work (C-x C-q)
2270 ;; before altering a backup file.
2273 ;; When a file is marked read-only,
2274 ;; make the buffer read-only even if root is looking at it.
2282 ;; If requested, add a newline at the end of the file.
2293 view-read-only
2301 "Choose the major mode for this buffer automatically.
2302 Also sets up any specified local variables of the file.
2303 Uses the visited file name, the -*- line, and the local variables spec.
2305 This function is called automatically from `find-file'. In that case,
2306 we may set up the file-specified mode and local variables,
2307 depending on the value of `enable-local-variables'.
2308 In addition, if `local-enable-local-variables' is nil, we do
2309 not set local variables (though we do notice a mode specified with -*-.)
2311 `enable-local-variables' is ignored if you run `normal-mode' interactively,
2312 or from Lisp without specifying the optional argument FIND-FILE;
2313 in that case, this function acts as if `enable-local-variables' were t."
2317 ;; FIXME this is less efficient than it could be, since both
2318 ;; s-a-m and h-l-v may parse the same regions, looking for "mode:".
2323 ;; Turn font lock off and on, to make sure it takes account of
2324 ;; whatever file local variables are relevant to it.
2326 ;; Font-lock-mode (now in font-core.el) can be ON when
2327 ;; font-lock.el still hasn't been loaded.
2334 "Non-nil means to try second pass through `auto-mode-alist'.
2335 This means that if the first case-sensitive search through the alist fails
2336 to find a matching major mode, a second case-insensitive search is made.
2337 On systems with case-insensitive file names, this variable is ignored,
2338 since only a single case-insensitive search through the alist is made."
2344 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
2345 ;; c++-mode, java-mode and more) are added through autoload
2346 ;; directives in that file. That way is discouraged since it
2347 ;; spreads out the definition of the initial value.
2393 ;; Less common extensions come here
2394 ;; so more common ones above are found faster.
2402 ;; Besides .gdbinit, gdb documents other names to be usable for init
2403 ;; files, cross-debuggers can use something like
2404 ;; .PROCESSORNAME-gdbinit so that the host and target gdbinit files
2405 ;; don't interfere with each other.
2407 ;; GDB 7.5 introduced OBJFILE-gdb.gdb script files; e.g. a file
2408 ;; named 'emacs-gdb.gdb', if it exists, will be automatically
2409 ;; loaded when GDB reads an objfile called 'emacs'.
2417 ("\\(/\\|\\`\\)\\.\\(bash_\\(profile\\|history\\|log\\(in\\|out\\)\\)\\|z?log\\(in\\|out\\)\\)\\'" . sh-mode)
2441 ;; The Fortran standard does not say anything about file extensions.
2442 ;; .f90 was widely used for F90, now we seem to be trapped into
2443 ;; using a different extension for each language revision.
2444 ;; Anyway, the following extensions are supported by gfortran.
2452 ;; The list of archive file extensions should be in sync with
2453 ;; `auto-coding-alist' with `no-conversion' coding system.
2459 ;; Mailer puts message to be edited in
2460 ;; /tmp/Re.... or Message
2463 ;; some news reader is reported to use this
2476 ;; .emacs or .gnus or .viper following a directory delimiter in
2477 ;; Unix or MS-DOS syntax.
2480 ;; _emacs following a directory delimiter in MS-DOS syntax
2484 ;; Linux-2.6.9 uses some different suffix for linker scripts:
2485 ;; "ld", "lds", "lds.S", "lds.in", "ld.script", and "ld.script.balo".
2486 ;; eCos uses "ld" and "ldi". Netbsd uses "ldscript.*".
2489 ;; .xs is also used for ld scripts, but seems to be more commonly
2490 ;; associated with Perl .xs files (C with Perl bindings). (Bug#7071)
2492 ;; Explained in binutils ld/genscripts.sh. Eg:
2493 ;; A .x script file is the default script.
2494 ;; A .xr script is for linking without relocation (-r flag). Etc.
2498 ;; Common Lisp ASDF package system.
2505 ("\\.\\(?:PDF\\|DVI\\|OD[FGPST]\\|DOCX?\\|XLSX?\\|PPTX?\\|pdf\\|djvu\\|dvi\\|od[fgpst]\\|docx?\\|xlsx?\\|pptx?\\)\\'" . doc-view-mode-maybe)
2517 ;; Windows candidates may be opened case sensitively on Unix
2523 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
2524 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
2525 ;; ChangeLog.old etc. Other change-log-mode entries are above;
2526 ;; this has lower priority to avoid matching changelog.sgml etc.
2528 ;; either user's dot-files or under /etc or some such
2530 ;; alas not all ~/.*rc files are like this
2531 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
2536 ;; this contains everything twice, with space and with colon :-(
2538 ;; Get rid of any trailing .n.m and try again.
2539 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
2540 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
2541 ;; Using mode nil rather than `ignore' would let the search continue
2542 ;; through this list (with the shortened name) rather than start over.
2545 ;; This should come after "in" stripping (e.g. config.h.in).
2546 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
2548 ;; The following should come after the ChangeLog pattern
2549 ;; for the sake of ChangeLog.1, etc.
2550 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
2552 "Alist of filename patterns vs corresponding major mode functions.
2553 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
2554 \(NON-NIL stands for anything that is not nil; the value does not matter.)
2555 Visiting a file whose name matches REGEXP specifies FUNCTION as the
2556 mode function to use. FUNCTION will be called, unless it is nil.
2558 If the element has the form (REGEXP FUNCTION NON-NIL), then after
2559 calling FUNCTION (if it's not nil), we delete the suffix that matched
2560 REGEXP and search the list again for another match.
2562 The extensions whose FUNCTION is `archive-mode' should also
2563 appear in `auto-coding-alist' with `no-conversion' coding system.
2565 See also `interpreter-mode-alist', which detects executable script modes
2566 based on the interpreters they specify to run,
2571 "Select Conf mode or XML mode according to start of file."
2581 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
2582 ;; and pike-mode) are added through autoload directives in that
2583 ;; file. That way is discouraged since it spreads out the
2584 ;; definition of the initial value.
2613 "Alist mapping interpreter names to major modes.
2614 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
2615 Each element looks like (REGEXP . MODE).
2616 If REGEXP matches the entire name (minus any directory part) of
2617 the interpreter specified in the first line of a script, enable
2618 major mode MODE.
2625 ;; TODO really this should be a list of modes (eg tar-mode), not regexps,
2626 ;; because we are duplicating info from auto-mode-alist.
2627 ;; TODO many elements of this list are also in auto-coding-alist.
2636 "List of regexps matching file names in which to ignore local variables.
2638 Files matching this list are typically binary file formats.
2639 They may happen to contain sequences that look like local variable
2640 specifications, but are not really, or they may be containers for
2641 member files with their own local variable sections, which are
2642 not appropriate for the containing file.
2649 "List of regexps matching suffixes to remove from file names.
2650 The function `inhibit-local-variables-p' uses this: when checking
2651 a file name, it first discards from the end of the name anything that
2654 ;; Can't think of any situation in which you'd want this to be nil...
2659 "Return non-nil if file local variables should be ignored.
2660 This checks the file (or buffer) name against `inhibit-local-variables-regexps'
2661 and `inhibit-local-variables-suffixes'. If
2662 `inhibit-local-variables-ignore-case' is non-nil, this ignores case."
2671 sufs)
2676 temp))
2681 "Regexp matching interpreters, for file mode determination.
2682 This regular expression is matched against the first line of a file
2683 to determine the file's mode in `set-auto-mode'. If it matches, the file
2684 is assumed to be interpreted by the interpreter matched by the second group
2685 of the regular expression. The mode is then determined as the mode
2689 "Alist of buffer beginnings vs. corresponding major mode functions.
2690 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2691 After visiting a file, if REGEXP matches the text at the beginning of the
2692 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2693 call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
2694 major mode.
2696 If FUNCTION is nil, then it is not called. (That is a way of saying
2704 ;; The < comes before the groups (but the first) to reduce backtracking.
2705 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
2706 ;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
2710 comment-re "*"
2713 . html-mode)
2715 ;; These two must come after html, because they are more general:
2720 . sgml-mode)
2723 "Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
2724 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2725 After visiting a file, if REGEXP matches the text at the beginning of the
2726 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2727 call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
2728 have not specified a mode for this file.
2734 "Upper limit on `magic-mode-alist' regexp matches.
2738 "Select major mode appropriate for current buffer.
2740 To find the right major mode, this function checks for a -*- mode tag
2741 checks for a `mode:' entry in the Local Variables section of the file,
2742 checks if it uses an interpreter listed in `interpreter-mode-alist',
2743 matches the buffer beginning against `magic-mode-alist',
2744 compares the filename against the entries in `auto-mode-alist',
2745 then matches the buffer beginning against `magic-fallback-mode-alist'.
2747 If `enable-local-variables' is nil, or if the file name matches
2748 `inhibit-local-variables-regexps', this function does not check
2749 for any mode: tag anywhere in the file. If `local-enable-local-variables'
2750 is nil, then the only mode: tag that can be relevant is a -*- one.
2752 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2753 set the major mode only if that would change it. In other words
2754 we don't actually set it to the same mode the buffer already has."
2755 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2757 end done mode modes)
2758 ;; Once we drop the deprecated feature where mode: is also allowed to
2759 ;; specify minor-modes (ie, there can be more than one "mode:"), we can
2760 ;; remove this section and just let (hack-local-variables t) handle it.
2761 ;; Find a -*- mode tag.
2765 ;; Note by design local-enable-local-variables does not matter here.
2767 try-locals
2770 ;; Find all specifications for the `mode:' variable
2771 ;; and execute them left to right.
2783 modes)))
2784 ;; Simple -*-MODE-*- case.
2787 modes))))
2788 ;; If we found modes to use, invoke them now, outside the save-excursion.
2796 ;; continuing would call minor modes again, toggling them off
2798 ;; hack-local-variables checks local-enable-local-variables etc, but
2799 ;; we might as well be explicit here for the sake of clarity.
2801 enable-local-variables
2802 local-enable-local-variables
2803 try-locals
2810 ;; If we didn't, look for an interpreter specified in the first line.
2811 ;; As a special case, allow for things like "#!/bin/env perl", which
2812 ;; finds the interpreter anywhere in $PATH.
2818 ;; Map interpreter name to a mode, signaling we're done at the
2819 ;; same time.
2826 interpreter-mode-alist)
2828 ;; If we found an interpreter mode to use, invoke it now.
2830 ;; Next try matching the buffer beginning against magic-mode-alist.
2844 ;; Next compare the filename against the entries in auto-mode-alist.
2849 ;; Remove backup-suffixes from file name.
2851 ;; Remove remote file name identification.
2856 ;; Find first matching alist entry.
2859 ;; System is case-insensitive.
2863 ;; System is case-sensitive.
2865 ;; First match case-sensitively.
2869 ;; Fallback to case-insensitive match.
2883 ;; Next try matching the buffer beginning against magic-fallback-mode-alist.
2900 ;; When `keep-mode-if-same' is set, we are working on behalf of
2901 ;; set-visited-file-name. In that case, if the major mode specified is the
2902 ;; same one we already have, don't actually reset it. We don't want to lose
2903 ;; minor modes such as Font Lock.
2905 "Apply MODE and return it.
2906 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2907 any aliases and compared to current major mode. If they are the
2908 same, do nothing and return nil."
2914 mode)))
2917 "Regexp of lines to skip when looking for file-local settings.
2918 If the first line matches this regular expression, then the -*-...-*- file-
2922 "Find the -*- spec in the buffer.
2923 Call with point at the place to start searching from.
2924 If one is found, set point to the beginning and return the position
2925 of the end. Otherwise, return nil; may change point.
2926 The variable `inhibit-local-variables-regexps' can cause a -*- spec to
2927 be ignored; but `enable-local-variables' and `local-enable-local-variables'
2928 have no effect."
2931 ;; Don't look for -*- if this file name matches any
2932 ;; of the regexps in inhibit-local-variables-regexps.
2935 ;; If the file begins with "#!" (exec
2936 ;; interpreter magic), look for mode frobs
2937 ;; in the first two lines. You cannot
2938 ;; necessarily put them in the first line
2939 ;; of such a file without screwing up the
2940 ;; interpreter invocation. The same holds
2941 ;; for '\" in man pages (preprocessor
2942 ;; magic for the `man' program).
2953 end))))
2954 \f
2955 ;;; Handling file local variables
2959 file-local-variables-alist dir-local-variables-alist)
2964 "Normal hook run after processing a file's local variables specs.
2965 Major modes can use this to examine user-specified local variables
2969 "List variable-value pairs that are considered safe.
2970 Each element is a cons cell (VAR . VAL), where VAR is a variable
2971 symbol and VAL is a value that is considered safe."
2972 :risky t
2977 ;; This should be here at least as long as Emacs supports write-file-hooks.
2982 "Expressions that are considered safe in an `eval:' local variable.
2983 Add expressions to this list if you want Emacs to evaluate them, when
2984 they appear in an `eval' local variable specification, without first
2985 asking you for confirmation."
2986 :risky t
2991 ;; Risky local variables:
2994 buffer-auto-save-file-name
2995 buffer-file-name
2996 buffer-file-truename
2997 buffer-undo-list
2998 debugger
2999 default-text-properties
3000 eval
3001 exec-directory
3002 exec-path
3003 file-name-handler-alist
3004 frame-title-format
3005 global-mode-string
3006 header-line-format
3007 icon-title-format
3008 inhibit-quit
3009 load-path
3010 max-lisp-eval-depth
3011 max-specpdl-size
3012 minor-mode-map-alist
3013 minor-mode-overriding-map-alist
3014 mode-line-format
3015 mode-name
3016 overriding-local-map
3017 overriding-terminal-local-map
3018 process-environment
3019 standard-input
3020 standard-output
3021 unread-command-events))
3023 ;; Safe local variables:
3024 ;;
3025 ;; For variables defined by major modes, the safety declarations can go into
3026 ;; the major mode's file, since that will be loaded before file variables are
3027 ;; processed.
3028 ;;
3029 ;; For variables defined by minor modes, put the safety declarations in the
3030 ;; file defining the minor mode after the defcustom/defvar using an autoload
3031 ;; cookie, e.g.:
3032 ;;
3033 ;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
3034 ;;
3035 ;; Otherwise, when Emacs visits a file specifying that local variable, the
3036 ;; minor mode file may not be loaded yet.
3037 ;;
3038 ;; For variables defined in the C source code the declaration should go here:
3060 "Alist of file-local variable settings in the current buffer.
3061 Each element in this list has the form (VAR . VALUE), where VAR
3062 is a file-local variable (a symbol) and VALUE is the value
3063 specified. The actual value in the buffer may differ from VALUE,
3069 "Alist of directory-local variable settings in the current buffer.
3070 Each element in this list has the form (VAR . VALUE), where VAR
3071 is a directory-local variable (a symbol) and VALUE is the value
3072 specified in .dir-locals.el. The actual value in the buffer
3073 may differ from VALUE, if it is changed by the major or minor modes,
3078 "Normal hook run before setting file-local variables.
3079 It is called after checking for unsafe/risky variables and
3080 setting `file-local-variables-alist', and before applying the
3081 variables stored in `file-local-variables-alist'. A hook
3082 function is allowed to change the contents of this alist.
3084 This hook is called only if there is at least one file-local
3088 "Get confirmation before setting up local variable values.
3089 ALL-VARS is the list of all variables to be set up.
3090 UNSAFE-VARS is the list of those that aren't marked as safe or risky.
3091 RISKY-VARS is the list of those that are marked as risky.
3092 If these settings come from directory-local variables, then
3093 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3100 unsafe-vars))
3102 ;; Set up the contents of the *Local Variables* buffer.
3110 ", and variables that are risky (**)."
3118 y -- to apply the local variables list.
3122 ! -- to apply the local variables list, and permanently mark these
3134 ;; Make strings with embedded whitespace easier to read.
3142 ;; Display the buffer and read a choice.
3150 ""
3153 char)
3172 "Return local variables specified in the -*- line.
3173 Returns an alist of elements (VAR . VAL), where VAR is a variable
3174 and VAL is the specified value. Ignores any specification for
3175 `mode:' and `coding:' (which should have already been handled
3176 by `set-auto-mode' and `set-auto-coding', respectively).
3177 Return nil if the -*- line is malformed.
3179 If MODE-ONLY is non-nil, just returns the symbol specifying the
3180 mode, if there is one, otherwise nil."
3185 result)
3187 nil)
3189 ;; Simple form: "-*- MODENAME -*-".
3193 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
3194 ;; (last ";" is optional).
3195 ;; If MODE-ONLY, just check for `mode'.
3196 ;; Otherwise, parse the -*- line into the RESULT alist.
3204 ;; There used to be a downcase here,
3205 ;; but the manual didn't say so,
3206 ;; and people want to set var names that aren't all lc.
3212 ;; It is traditional to ignore
3213 ;; case when checking for `mode' in set-auto-mode,
3214 ;; so we must do that here as well.
3215 ;; That is inconsistent, but we're stuck with it.
3216 ;; The same can be said for `coding' in set-auto-coding.
3226 ;; Downcase "Mode:".
3232 result))))))
3235 "Filter local variable settings, querying the user if necessary.
3236 VARIABLES is the alist of variable-value settings. This alist is
3237 filtered based on the values of `ignored-local-variables',
3238 `enable-local-eval', `enable-local-variables', and (if necessary)
3239 user interaction. The results are added to
3240 `file-local-variables-alist', without applying them.
3241 If these settings come from directory-local variables, then
3242 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3243 ;; Find those variables that we may want to save to
3244 ;; `safe-local-variable-values'.
3250 ;; Ignore any variable in `ignored-local-variables'.
3251 nil)
3252 ;; Obey `enable-local-eval'.
3256 ;; In case previously marked safe (bug#5636).
3258 ;; If not safe and e-l-v = :safe, ignore totally.
3262 safe
3264 ;; Ignore duplicates (except `mode') in the present list.
3266 ;; Accept known-safe variables.
3270 ;; The variable is either risky or unsafe:
3277 ;; Query, unless all vars are safe or user wants no querying.
3283 risky-vars dir-name))
3293 ;; TODO? Warn once per file rather than once per session?
3297 "Parse and put into effect this buffer's local variables spec.
3298 Uses `hack-local-variables-apply' to apply the variables.
3301 is specified, and return the corresponding mode symbol, or nil.
3302 In this case, we try to ignore minor-modes, and only return a
3303 major-mode.
3305 If `enable-local-variables' or `local-enable-local-variables' is nil,
3306 this function does nothing. If `inhibit-local-variables-regexps'
3307 applies to the file in question, the file is not scanned for
3308 local variables, but directory-local variables may still be applied."
3309 ;; We don't let inhibit-local-variables-p influence the value of
3310 ;; enable-local-variables, because then it would affect dir-local
3311 ;; variables. We don't want to search eg tar files for file local
3312 ;; variable sections, but there is no reason dir-locals cannot apply
3313 ;; to them. The real meaning of inhibit-local-variables-p is "do
3314 ;; not scan this file for local variables".
3317 result)
3321 ;; Note this is a no-op if enable-local-variables is nil.
3323 ;; This entire function is basically a no-op if enable-local-variables
3324 ;; is nil. All it does is set file-local-variables-alist to nil.
3326 ;; This part used to ignore enable-local-variables when mode-only
3327 ;; was non-nil. That was inappropriate, eg consider the
3328 ;; (artificial) example of:
3329 ;; (setq local-enable-local-variables nil)
3330 ;; Open a file foo.txt that contains "mode: sh".
3331 ;; It correctly opens in text-mode.
3332 ;; M-x set-visited-file name foo.c, and it incorrectly stays in text-mode.
3334 ;; If MODE-ONLY is non-nil, and the prop line specifies a
3335 ;; mode, then we're done, and have no need to scan further.
3337 mode-only))
3338 ;; Look for "Local variables:" line in last page.
3346 ;; suffix is what comes after "local variables:" in its line.
3347 ;; prefix is what comes before "local variables:" in its line.
3360 endpos
3366 nil t))
3367 ;; This used to be an error, but really all it means is
3368 ;; that this may simply not be a local-variables section,
3369 ;; so just ignore it.
3379 ;; Discard the prefix.
3384 ;; Discard the suffix.
3393 ;; Find the variable name;
3401 val val2)
3404 ;; Read the variable value.
3411 ;; Specifying minor-modes via mode: is
3412 ;; deprecated, but try to reject them anyway.
3422 'files
3424 "%s: `lexical-binding' at end of file unreliable"
3430 'eval
3434 ;; Now we've read all the local variables.
3435 ;; If MODE-ONLY is non-nil, return whether the mode was specified.
3437 ;; Otherwise, set the variables.
3442 "Apply the elements of `file-local-variables-alist'.
3443 If there are any elements, runs `before-hack-local-variables-hook',
3444 then calls `hack-one-local-variable' to apply the alist elements one by one.
3445 Finishes by running `hack-local-variables-hook', regardless of whether
3446 the alist is empty or not.
3448 Note that this function ignores a `mode' entry if it specifies the same
3449 major mode as the buffer already has."
3451 ;; Any 'evals must run in the Right sequence.
3460 "Non-nil if SYM is safe as a file-local variable with value VAL.
3461 It is safe if any of these conditions are met:
3463 * There is a matching entry (SYM . VAL) in the
3464 `safe-local-variable-values' user option.
3466 * The `safe-local-variable' property of SYM is a function that
3467 evaluates to a non-nil value with VAL as an argument."
3471 ;; If the function signals an error, that means it
3472 ;; can't assure us that the value is safe.
3476 "Non-nil if SYM could be dangerous as a file-local variable.
3477 It is dangerous if either of these conditions are met:
3479 * Its `risky-local-variable' property is non-nil.
3485 ;; If this is an alias, check the base name.
3505 "Return t if it is safe to eval EXP when it is found in a file."
3507 ;; Detect certain `put' expressions.
3514 lisp-indent-function
3515 scheme-indent-function))
3516 ;; Only allow safe values (not functions).
3521 ;; Only allow indirect form specs.
3522 ;; During bootstrapping, edebug-basic-spec might not be
3523 ;; defined yet.
3527 ;; Allow expressions that the user requested.
3529 ;; Certain functions can be allowed with safe arguments
3530 ;; or can specify verification functions to try.
3532 ;; Allow (minor)-modes calls with no arguments.
3533 ;; This obsoletes the use of "mode:" for such things. (Bug#8613)
3542 ok))
3550 ok))))))))
3564 "Set local variable VAR with value VAL.
3565 If VAR is `mode', call `VAL-mode' as a function unless it's
3566 already the major mode."
3568 (`mode
3574 (`eval
3580 ;; Make sure the string has no text properties.
3581 ;; Some text properties can get evaluated in various ways,
3582 ;; so it is risky to put them on with a local variable list.
3586 \f
3587 ;;; Handling directory-local variables, aka project settings.
3593 "List of cached directory roots for directory-local variable classes.
3594 Each element in this list has the form (DIR CLASS MTIME).
3595 DIR is the name of the directory.
3596 CLASS is the name of a variable class (a symbol).
3597 MTIME is the recorded modification time of the directory-local
3598 variables file associated with this entry. This time is a list
3599 of integers (the same format as `file-attributes'), and is
3600 used to test whether the cache entry is still valid.
3601 Alternatively, MTIME can be nil, which means the entry is always
3605 "Return the variable list for CLASS."
3609 "Collect directory-local variables from MODE-VARIABLES.
3610 VARIABLES is the initial list of variables.
3611 Returns the new list."
3616 ;; If variables are specified more than once, only use the last. (Why?)
3617 ;; The pseudo-variables mode and eval are different (bug#3430).
3620 ;; Need a new cons in case we setcdr later.
3624 "Collect entries from CLASS-VARIABLES into VARIABLES.
3625 ROOT is the root directory of the project.
3626 Return the new variables list."
3628 ;; Handle non-file buffers, too.
3631 ;; FIXME: Why not use file-relative-name?
3638 ;; Don't include this in the previous condition, because we
3639 ;; want to filter all strings before the next condition.
3653 ;; TODO someone might want to extend this to allow
3654 ;; integer values for subdir, where N means
3655 ;; variables apply to this directory and N levels
3656 ;; below it (0 == nil).
3659 alist variables))))))))
3661 ;; The file's content might be invalid (e.g. have a merge conflict), but
3662 ;; that shouldn't prevent the user from opening the file.
3664 nil))))
3667 "Declare that the DIRECTORY root is an instance of CLASS.
3668 DIRECTORY is the name of a directory, a string.
3669 CLASS is the name of a project class, a symbol.
3670 MTIME is either the modification time of the directory-local
3671 variables file that defined this class, or nil.
3673 When a file beneath DIRECTORY is visited, the mode-specific
3674 variables from CLASS are applied to the buffer. The variables
3675 for a class are defined using `dir-locals-set-class-variables'."
3682 "Map the type CLASS to a list of variable settings.
3683 CLASS is the project class, a symbol. VARIABLES is a list
3684 that declares directory-local variables for the class.
3685 An element in VARIABLES is either of the form:
3686 (MAJOR-MODE . ALIST)
3687 or
3688 (DIRECTORY . LIST)
3690 In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
3691 whose elements are of the form (VARIABLE . VALUE).
3693 In the second form, DIRECTORY is a directory name (a string), and
3694 LIST is a list of the form accepted by the function.
3696 When a file is visited, the file's class is found. A directory
3697 may be assigned a class using `dir-locals-set-directory-class'.
3698 Then variables are set in the file's buffer according to the
3699 VARIABLES list of the class. The list is processed in order.
3701 * If the element is of the form (MAJOR-MODE . ALIST), and the
3702 buffer's major mode is derived from MAJOR-MODE (as determined
3703 by `derived-mode-p'), then all the variables in ALIST are
3704 applied. A MAJOR-MODE of nil may be used to match any buffer.
3705 `make-local-variable' is called for each variable before it is
3706 set.
3708 * If the element is of the form (DIRECTORY . LIST), and DIRECTORY
3709 is an initial substring of the file's directory, then LIST is
3710 applied by recursively following these rules."
3714 "Pattern for files that contain directory-local variables.
3715 It has to be constant to enforce uniform values across different
3716 environments and users.
3718 Multiple dir-locals files in the same directory are loaded in
3719 `string<' order.
3723 "Return a list of all readable dir-locals files matching FILE-OR-DIR.
3724 If FILE-OR-DIR is a file pattern, expand wildcards in it and
3725 return a sorted list of the results. If it is a directory name,
3726 return a sorted list of all files matching `dir-locals-file' in
3727 this directory.
3728 The returned list is sorted by `string<' order."
3731 file-or-dir
3732 default-directory)))
3742 "Find the directory-local variables for FILE.
3743 This searches upward in the directory tree from FILE.
3744 It stops at the first directory that has been registered in
3745 `dir-locals-directory-cache' or contains a `dir-locals-file'.
3746 If it finds an entry in the cache, it checks that it is valid.
3747 A cache entry with no modification time element (normally, one that
3748 has been assigned directly using `dir-locals-set-directory-class', not
3749 set from a file) is always valid.
3750 A cache entry based on a `dir-locals-file' is valid if the modification
3751 time stored in the cache matches the current file modification time.
3752 If not, the cache entry is cleared so that the file will be re-read.
3754 This function returns either nil (no directory local variables found),
3755 or the matching entry from `dir-locals-directory-cache' (a list),
3756 or the full path to the `dir-locals-file' (a string) in the case
3757 of no valid cache entry. If `dir-locals-file' contains
3758 wildcards, then the return value is not a proper filename, it is
3759 an absolute version of `dir-locals-file' which is guaranteed to
3760 expand to at least one file."
3764 locals-file dir-elt)
3765 ;; `locate-dominating-file' may have abbreviated the name.
3770 dir-locals-file)
3771 locals-dir)))
3772 ;; Find the best cached value in `dir-locals-directory-cache'.
3783 ;; Found a potential cache entry. Check validity.
3784 ;; A cache entry with no MTIME is assumed to always be valid
3785 ;; (ie, set directly, not from a dir-locals file).
3786 ;; Note, we don't bother to check that there is a matching class
3787 ;; element in dir-locals-class-alist, since that's done by
3788 ;; dir-locals-set-directory-class.
3791 ;; The entry MTIME should match the most recent
3792 ;; MTIME among matching files.
3796 cached-files))))))
3797 ;; This cache entry is OK.
3798 dir-elt
3799 ;; This cache entry is invalid; clear it.
3802 ;; Return the first existing dir-locals file. Might be the same
3803 ;; as dir-elt's, might not (eg latter might have been deleted).
3804 locals-file)
3805 ;; No cache entry.
3806 locals-file)))
3809 "Load a variables FILE and register a new class and instance.
3810 FILE is the absolute name of the file holding the variables to
3811 apply. It may contain wildcards.
3812 The new class name is the same as the directory in which FILE
3813 is found. Returns the new class name."
3828 variables
3834 dir-name class-name
3839 files))
3840 ;; If there was a problem, use the values we could get but
3841 ;; don't let the cache prevent future reads.
3843 class-name))
3846 "Non-nil means dir-local variables will be applied to remote files."
3854 "Read per-directory local variables for the current buffer.
3855 Store the directory-local variables in `dir-local-variables-alist'
3856 and `file-local-variables-alist', without applying them.
3858 This does nothing if either `enable-local-variables' or
3859 `enable-dir-local-variables' are nil."
3861 enable-dir-local-variables
3864 default-directory)))))
3865 ;; Find the variables file.
3895 "Apply directory-local variables to a non-file buffer.
3896 For non-file buffers, such as Dired buffers, directory-local
3897 variables are looked for in `default-directory' and its parent
3898 directories."
3902 \f
3905 However, the mode will not be changed if
3906 \(1) a local variables list or the `-*-' line specifies a major mode, or
3908 not suitable for ordinary files, or
3909 \(3) the new file name does not particularly specify any mode."
3914 "Change name of file visited in current buffer to FILENAME.
3915 This also renames the buffer to correspond to the new file.
3916 The next time the buffer is saved it will go in the newly specified file.
3917 FILENAME nil or an empty string means mark buffer as not visiting any file.
3918 Remember to delete the initial contents of the minibuffer
3919 if you wish to pass an empty string as the argument.
3921 The optional second argument NO-QUERY, if non-nil, inhibits asking for
3922 confirmation in the case where another buffer is already visiting FILENAME.
3924 The optional third argument ALONG-WITH-FILE, if non-nil, means that
3925 the old visited file has been renamed to the new name FILENAME."
3933 nil
3948 filename)))
3955 buffer-file-name filename)
3959 ;; If new-name == old-name, renaming would add a spurious <2>
3960 ;; and it's considered as a feature in rename-buffer.
3966 ;; Abbreviate the file names of the buffer.
3975 nil))
3976 ;; write-file-functions is normally used for things like ftp-find-file
3977 ;; that visit things that are not local files as if they were files.
3978 ;; Changing to visit an ordinary local file instead should flush the hook.
3983 ;; If buffer was read-only because of version control,
3984 ;; that reason is gone now, so make it writable.
3988 ;; Turn off backup files for certain file names.
3989 ;; Since this is a permanent local, the major mode won't eliminate it.
3991 backup-enable-predicate
4000 ;; If auto-save was not already on, turn it on if appropriate.
4003 ;; If auto save is on, start using a new name. We
4004 ;; deliberately don't rename or delete the old auto save
4005 ;; for the old visited file name. This is because
4006 ;; perhaps the user wants to save the new state and then
4007 ;; compare with the previous state from the auto save
4008 ;; file.
4010 ;; Rename the old auto save file if any.
4017 ;; Update the major mode, if the file name determines it.
4019 ;; Don't change the mode if it is special.
4022 ;; Don't change the mode if the local variable list specifies it.
4023 ;; The file name can influence whether the local variables apply.
4025 ;; h-l-v also checks it, but might as well be explicit.
4028 ;; TODO consider making normal-mode handle this case.
4036 "Write current buffer into file FILENAME.
4037 This makes the buffer visit that file, and marks it as not modified.
4039 If you specify just a directory name as FILENAME, that means to use
4040 the default file name but in that directory. You can also yank
4041 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
4043 If the buffer is not already visiting a file, the default file name
4044 for the output file is the buffer name.
4046 If optional second arg CONFIRM is non-nil, this function
4047 asks for confirmation before overwriting an existing file.
4048 Interactively, confirmation is required unless you supply a prefix argument."
4049 ;; (interactive "FWrite file: ")
4053 nil nil nil nil)
4057 default-directory)
4058 nil nil))
4062 ;; If arg is just a directory,
4063 ;; use the default file name, but in that directory.
4070 ;; NS does its own confirm dialog.
4073 use-dialog-box))
4079 ;; Make buffer writable if file is writable.
4084 ;; It's likely that the VC status at the new location is different from
4085 ;; the one at the old location.
4087 \f
4089 "Return an alist of extended attributes of file FILENAME.
4091 Extended attributes are platform-specific metadata about the file,
4092 such as SELinux context, list of ACL entries, etc."
4097 "Set extended attributes of file FILENAME to ATTRIBUTES.
4099 ATTRIBUTES must be an alist of file attributes as returned by
4100 `file-extended-attributes'.
4101 Value is t if the function succeeds in setting the attributes."
4112 result))
4113 \f
4115 "Make a backup of the disk file visited by the current buffer, if appropriate.
4116 This is normally done before saving the buffer the first time.
4118 A backup may be done by renaming or by copying; see documentation of
4119 variable `make-backup-files'. If it's done by renaming, then the file is
4120 no longer accessible under its old name.
4122 The value is non-nil after a backup was made by renaming.
4123 It has the form (MODES EXTENDED-ATTRIBUTES BACKUPNAME).
4124 MODES is the result of `file-modes' on the original
4125 file; this means that the caller, after saving the buffer, should change
4126 the modes of the new file to agree with the old modes.
4127 EXTENDED-ATTRIBUTES is the result of `file-extended-attributes'
4128 on the original file; this means that the caller, after saving
4129 the buffer, should change the extended attributes of the new file
4130 to agree with the old attributes.
4131 BACKUPNAME is the backup file name, which is the old file renamed."
4135 ;; If specified name is a symbolic link, chase it to the target.
4136 ;; This makes backups in the directory where the real file is.
4143 ;; If have old versions to maybe delete,
4144 ;; ask the user to confirm now, before doing anything.
4145 ;; But don't actually delete til later.
4151 real-file-name)))
4152 targets))
4157 backup-by-copying-when-privileged-mismatch)
4160 ;; Don't rename a suid or sgid file.
4169 real-file-name
4172 copy-when-priv-mismatch))))
4174 t)))))
4175 setmodes)
4178 ;; Actually make the backup file.
4181 modes extended-attributes)
4182 ;; rename-file should delete old backup.
4185 backupname)))
4187 ;; Now delete the old versions, if desired.
4191 ;; If trouble writing the backup, write it in .emacs.d/%backup%.
4195 backupname)
4198 modes extended-attributes)
4200 setmodes)))))))
4203 ;; Create temp files with strict access rights. It's easy to
4204 ;; loosen them later, whereas it's impossible to close the
4205 ;; time-window of loose permissions otherwise.
4208 ;; Try to overwrite old backup first.
4216 nil)
4218 ;; The file was somehow created by someone else between
4219 ;; `delete-file' and `copy-file', so let's try again.
4220 ;; rms says "I think there is also a possible race
4221 ;; condition for making backup files" (emacs-devel 20070821).
4222 nil)))
4223 ;; If set-file-extended-attributes fails, fall back on set-file-modes.
4232 ;; The last ~[[:digit]]+ matches relative versions in git,
4233 ;; e.g. `foo.js.~HEAD~1~'.
4234 "Regular expression matching the backup/version part of a file name.
4238 "Return file NAME sans backup versions or strings.
4239 This is a separate procedure so your site-init or startup file can
4240 redefine it.
4241 If the optional argument KEEP-BACKUP-VERSION is non-nil,
4242 we do not remove backup version numbers, only true file version numbers.
4243 See also `file-name-version-regexp'."
4250 name))))))
4253 "Return t if deleting FILE and rewriting it would preserve the owner.
4254 Return nil if FILE does not exist, or if deleting and recreating it
4255 might not preserve the owner. If GROUP is non-nil, check whether
4256 the group would be preserved too."
4261 ;; Return t if the file doesn't exist, since it's true that no
4262 ;; information would be lost by an (attempted) delete and create.
4265 ;; Files created on Windows by Administrator (RID=500)
4266 ;; have the Administrators group (RID=544) recorded as
4267 ;; their owner. Rewriting them will still preserve the
4268 ;; owner.
4272 ;; On BSD-derived systems files always inherit the parent
4273 ;; directory's group, so skip the group-gid test.
4279 ;; On some systems, a file created in a setuid directory
4280 ;; inherits that directory's owner.
4284 ;; On many systems, a file created in a setgid directory
4285 ;; inherits that directory's group. On some systems
4286 ;; this happens even if the setgid bit is not set.
4293 The extension, in a file name, is the part that follows the last `.',
4294 except that a leading `.', if any, doesn't count."
4297 directory)
4301 ;; Don't use expand-file-name here; if DIRECTORY is relative,
4302 ;; we don't want to expand it.
4305 filename))))
4309 The extension, in a file name, is the part that follows the last `.',
4310 excluding version numbers and backup suffixes,
4311 except that a leading `.', if any, doesn't count.
4312 Return nil for extensionless file names such as `foo'.
4313 Return the empty string for file names such as `foo.'.
4315 If PERIOD is non-nil, then the returned value includes the period
4316 that delimits the extension, and if FILENAME has no extension,
4327 "Return the base name of the FILENAME: no directory, no extension.
4328 FILENAME defaults to `buffer-file-name'."
4333 #'make-backup-file-name--default-function
4334 "A function that `make-backup-file-name' uses to create backup file names.
4335 The function receives a single argument, the original file name.
4337 If you change this, you may need to change `backup-file-name-p' and
4338 `file-name-sans-versions' too.
4340 You could make this buffer-local to do something special for specific files.
4342 For historical reasons, a value of nil means to use the default function.
4343 This should not be relied upon.
4345 See also `backup-directory-alist'."
4352 "Alist of filename patterns and backup directory names.
4353 Each element looks like (REGEXP . DIRECTORY). Backups of files with
4354 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
4355 relative or absolute. If it is absolute, so that all matching files
4356 are backed up into the same directory, the file names in this
4357 directory will be the full name of the file backed up with all
4358 directory separators changed to `!' to prevent clashes. This will not
4359 work correctly if your filesystem truncates the resulting name.
4361 For the common case of all backups going into one directory, the alist
4363 directory name.
4365 If this variable is nil, or it fails to match a filename, the backup
4366 is made in the original file's directory.
4368 On MS-DOS filesystems without long names this variable is always
4369 ignored."
4375 "Default `backup-enable-predicate' function.
4376 Checks for files in `temporary-file-directory',
4377 `small-temporary-file-directory', and /tmp."
4379 caseless)
4380 ;; On MS-Windows, file-truename will convert short 8+3 aliases to
4381 ;; their long file-name equivalents, so compare-strings does TRT.
4385 caseless t))
4388 ;; Directory is under temporary-file-directory.
4393 ;; Directory is under /tmp.
4398 0 nil
4400 ;; Directory is under small-temporary-file-directory.
4405 "Create the non-numeric backup file name for FILE.
4406 This calls the function that `make-backup-file-name-function' specifies,
4407 with a single argument FILE."
4410 file))
4413 "Default function for `make-backup-file-name'.
4414 Normally this just returns FILE's name with `~' appended.
4415 It searches for a match for FILE in `backup-directory-alist'.
4416 If the directory for the backup doesn't exist, it is created."
4428 "Subroutine of `make-backup-file-name--default-function'.
4429 The function `find-backup-file-name' also uses this."
4431 elt backup-directory abs-backup-directory)
4436 alist nil)))
4437 ;; If backup-directory is relative, it should be relative to the
4438 ;; file's directory. By expanding explicitly here, we avoid
4439 ;; depending on default-directory.
4448 abs-backup-directory nil))))
4450 file
4454 ;; Normalize DOSish file names: downcase the drive
4455 ;; letter, if any, and replace the leading "x:" with
4456 ;; "/drive_x".
4459 ;; Replace any invalid file-name characters (for the
4460 ;; case of backing up remote files).
4464 "drive_"
4467 ""
4470 ;; Make the name unique by substituting directory
4471 ;; separators. It may not really be worth bothering about
4472 ;; doubling `!'s in the original name...
4477 backup-directory))
4482 "Return non-nil if FILE is a backup file name (numeric or not).
4483 This is a separate function so you can redefine it for customization.
4484 You may need to redefine `file-name-sans-versions' as well."
4489 ;; This is used in various files.
4490 ;; The usage of backup-extract-version-start is not very clean,
4491 ;; but I can't see a good alternative, so as of now I am leaving it alone.
4493 "Given the name of a numeric backup file, FN, return the backup number.
4494 Uses the free variable `backup-extract-version-start', whose value should be
4495 the index in the name where the version number begins."
4502 "Find a file name for a backup file FN, and suggestions for deletions.
4503 Value is a list whose car is the name for the backup file
4504 and whose cdr is a list of old versions to consider deleting now.
4505 If the value is nil, don't make a backup.
4506 Uses `backup-directory-alist' in the same way as
4507 `make-backup-file-name--default-function' does."
4509 ;; Run a handler for this function so that ange-ftp can refuse to do it.
4513 ;; We don't support numbered backups on plain MS-DOS
4514 ;; when long file names are unavailable.
4524 possibilities deserve-versions-p versions)
4527 base-versions
4530 possibilities)
4531 #'<)
4536 kept-old-versions
4537 kept-new-versions
4544 ;; Delete nothing if there is overflow
4545 ;; in the number of versions to keep.
4551 v))))))))))
4554 "Return number of names file FILENAME has."
4557 ;; (defun file-relative-name (filename &optional directory)
4558 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4559 ;; This function returns a relative file name which is equivalent to FILENAME
4560 ;; when used with that default directory as the default.
4561 ;; If this is impossible (which can happen on MSDOS and Windows
4562 ;; when the file name and directory use different drive names)
4563 ;; then it returns FILENAME."
4564 ;; (save-match-data
4565 ;; (let ((fname (expand-file-name filename)))
4566 ;; (setq directory (file-name-as-directory
4567 ;; (expand-file-name (or directory default-directory))))
4568 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
4569 ;; ;; drive names, they can't be relative, so return the absolute name.
4570 ;; (if (and (or (eq system-type 'ms-dos)
4571 ;; (eq system-type 'cygwin)
4572 ;; (eq system-type 'windows-nt))
4573 ;; (not (string-equal (substring fname 0 2)
4574 ;; (substring directory 0 2))))
4575 ;; filename
4576 ;; (let ((ancestor ".")
4577 ;; (fname-dir (file-name-as-directory fname)))
4578 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
4579 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
4580 ;; (setq directory (file-name-directory (substring directory 0 -1))
4581 ;; ancestor (if (equal ancestor ".")
4582 ;; ".."
4583 ;; (concat "../" ancestor))))
4584 ;; ;; Now ancestor is empty, or .., or ../.., etc.
4585 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
4586 ;; ;; We matched within FNAME's directory part.
4587 ;; ;; Add the rest of FNAME onto ANCESTOR.
4588 ;; (let ((rest (substring fname (match-end 0))))
4589 ;; (if (and (equal ancestor ".")
4590 ;; (not (equal rest "")))
4591 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
4592 ;; rest
4593 ;; (concat (file-name-as-directory ancestor) rest)))
4594 ;; ;; We matched FNAME's directory equivalent.
4595 ;; ancestor))))))
4598 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4599 This function returns a relative file name which is equivalent to FILENAME
4600 when used with that default directory as the default.
4601 If FILENAME is a relative file name, it will be interpreted as existing in
4602 `default-directory'.
4603 If FILENAME and DIRECTORY lie on different machines or on different drives
4604 on a DOS/Windows machine, it returns FILENAME in expanded form."
4608 default-directory))))
4613 read-file-name-completion-ignore-case)))
4616 ;; Test for different filesystems on DOS/Windows
4618 ;; Should `cygwin' really be included here? --stef
4621 ;; Test for different drive letters
4623 ;; Test for UNCs on different servers
4628 ;; Windows file names cannot have ? in
4629 ;; them, so use that to detect when
4630 ;; neither FILENAME nor DIRECTORY is a
4631 ;; UNC.
4633 0 nil
4639 ;; Test for different remote file system identification
4641 filename
4649 ".."
4651 ;; Now ancestor is empty, or .., or ../.., etc.
4653 ;; We matched within FILENAME's directory part.
4654 ;; Add the rest of FILENAME onto ANCESTOR.
4657 ;; But don't bother with ANCESTOR if it would give us `./'.
4658 rest
4660 ;; We matched FILENAME's directory equivalent.
4661 ancestor))))))
4662 \f
4664 "Save current buffer in visited file if modified.
4665 Variations are described below.
4667 By default, makes the previous version into a backup file
4668 if previously requested or if this is the first save.
4670 to become a backup when the next save is done.
4672 unconditionally makes the previous version into a backup file.
4674 to become a backup when the next save is done,
4675 and unconditionally makes the previous version into a backup file.
4677 With a numeric prefix argument of 0, never make the previous version
4678 into a backup file.
4680 If a file's name is FOO, the names of its numbered backup versions are
4681 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
4682 Numeric backups (rather than FOO~) will be made if value of
4683 `version-control' is not the atom `never' and either there are already
4684 numeric versions of the file being backed up, or `version-control' is
4685 non-nil.
4686 We don't want excessive versions piling up, so there are variables
4687 `kept-old-versions', which tells Emacs how many oldest versions to keep,
4688 and `kept-new-versions', which tells how many newest versions to keep.
4689 Defaults are 2 old versions and 2 new.
4690 `dired-kept-versions' controls dired's clean-directory (.) command.
4691 If `delete-old-versions' is nil, system will query user
4692 before trimming versions. Otherwise it does it silently.
4694 If `vc-make-backup-files' is nil, which is the default,
4695 no backup files are made for files managed by version control.
4696 (This is because the version control system itself records previous versions.)
4698 See the subroutine `basic-save-buffer' for more information."
4704 ;; We used to display the message below only for files > 50KB, but
4705 ;; then Rmail-mbox never displays it due to buffer swapping. If
4706 ;; the test is ever re-introduced, be sure to handle saving of
4707 ;; Rmail files.
4717 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
4718 Normally delete only if the file was written by this Emacs since
4719 the last real save, but optional arg FORCE non-nil means delete anyway."
4733 "Normal hook that is run before a buffer is saved to its file."
4739 "Normal hook that is run after a buffer is saved to its file."
4745 "If non-nil, use this coding system for saving the buffer.
4746 More precisely, use this coding system in place of the
4747 value of `buffer-file-coding-system', when saving the buffer.
4748 Calling `write-region' for any purpose other than saving the buffer
4749 will still use `buffer-file-coding-system'; this variable has no effect
4756 "Save the current buffer in its visited file, if it has been modified.
4757 The hooks `write-contents-functions' and `write-file-functions' get a chance
4758 to do the job of saving; if they do not, then the buffer is saved in
4759 the visited file in the usual way.
4760 Before and after saving the buffer, this function runs
4761 `before-save-hook' and `after-save-hook', respectively."
4764 ;; In an indirect buffer, save its base buffer instead.
4768 ;; handle the case when no modification has been made but
4769 ;; the file disappeared since visited
4773 setmodes)
4774 ;; If buffer has no file name, ask user for one.
4782 ;; Signal an error if the user specified the name of an
4783 ;; existing directory.
4786 "File `%s' exists; overwrite? "
4787 filename))
4794 "%s has changed since visited or saved. Save anyway? "
4814 ;; Support VC version backups.
4816 ;; Don't let errors prevent saving the buffer.
4821 ;; If a hook returned t, file is already "written".
4822 ;; Otherwise, write it the usual way now.
4832 ;; Now we have saved the current buffer. Let's make sure
4833 ;; that buffer-file-coding-system is fixed to what
4834 ;; actually used for saving by binding it locally.
4849 ;; If the auto-save file was recent before this command,
4850 ;; delete it now.
4852 ;; Support VC `implicit' locking.
4859 ;; This does the "real job" of writing a buffer into its visited file
4860 ;; and making a backup file. This is what is normally done
4861 ;; but inhibited if one of write-file-functions returns non-nil.
4862 ;; It returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4863 ;; backup-buffer.
4873 ;; This returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4874 ;; backup-buffer.
4887 "File %s is write-protected; try to save anyway? "
4889 buffer-file-name)))
4903 dir))))
4904 ;; Write temp name, then rename it.
4905 ;; This requires write access to the containing dir,
4906 ;; which is why we don't try it if we don't have that access.
4908 tempname succeed
4911 ;; Create temp files with strict access rights. It's easy to
4912 ;; loosen them later, whereas it's impossible to close the
4913 ;; time-window of loose permissions otherwise.
4918 ;; Try various temporary names.
4919 ;; This code follows the example of make-temp-file,
4920 ;; but it calls write-region in the appropriate way
4921 ;; for saving the buffer.
4927 ;; Pass in nil&nil rather than point-min&max
4928 ;; cause we're saving the whole buffer.
4929 ;; write-region-annotate-functions may use it.
4931 tempname nil realname
4934 nil)
4936 ;; The file was somehow created by someone else between
4937 ;; `make-temp-name' and `write-region', let's try again.
4938 nil)
4940 ;; Reset the umask.
4942 ;; If we failed, restore the buffer's modtime.
4945 ;; Since we have created an entirely new file,
4946 ;; make sure it gets the right permission bits set.
4951 buffer-file-name)))
4952 ;; We succeeded in writing the temp file,
4953 ;; so rename it.
4955 ;; If file not writable, see if we can make it writable
4956 ;; temporarily while we write it.
4957 ;; But no need to do so if we have just backed it up
4958 ;; (setmodes is set) because that says we're superseding.
4960 ;; Change the mode back, after writing.
4963 buffer-file-name))
4964 ;; If set-file-extended-attributes fails, fall back on
4965 ;; set-file-modes.
4975 ;; Pass in nil&nil rather than point-min&max to indicate
4976 ;; we're saving the buffer rather than just a region.
4977 ;; write-region-annotate-functions may make us of it.
4979 buffer-file-name nil t buffer-file-truename)
4982 ;; If we get an error writing the new file, and we made
4983 ;; the backup by renaming, undo the backing-up.
4988 setmodes))
4994 `((?\C-r
5001 ;; Return nil to ask about BUF again.
5002 nil)
5015 ;; Return nil to ask about BUF again.
5016 nil)
5026 "Save some modified file-visiting buffers. Asks user about each one.
5027 You can answer `y' to save, `n' not to save, `C-r' to look at the
5028 buffer in question with `view-buffer' before deciding or `d' to
5029 view the differences using `diff-buffer-with-file'.
5031 This command first saves any buffers where `buffer-save-without-query' is
5032 non-nil, without asking.
5034 Optional argument (the prefix) non-nil means save all with no questions.
5035 Optional second argument PRED determines which buffers are considered:
5036 If PRED is nil, all the file-visiting buffers are considered.
5037 If PRED is t, then certain non-file buffers will also be considered.
5038 If PRED is a zero-argument function, it indicates for each buffer whether
5039 to consider it or not when called with that buffer current.
5041 See `save-some-buffers-action-alist' if you want to
5042 change the additional actions you can take on files."
5046 files-done abbrevs-done)
5048 ;; First save any buffers that we're supposed to save unconditionally.
5049 ;; That way the following code won't ask about them.
5054 ;; Ask about those buffers that merit it,
5055 ;; and record the number thus saved.
5059 ;; Note that killing some buffers may kill others via
5060 ;; hooks (e.g. Rmail and its viewing buffer).
5073 t
5085 save-some-buffers-action-alist))
5086 ;; Maybe to save abbrevs, and record whether
5087 ;; we either saved them or asked to.
5094 ;; Don't keep bothering user if he says no.
5108 \f
5110 "Clear out records of last mod time of visited file.
5111 Next attempt to save will certainly not complain of a discrepancy."
5115 "Mark current buffer as unmodified, not needing to be saved.
5118 It is not a good idea to use this function in Lisp programs, because it
5119 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
5127 "Change whether this buffer is read-only."
5135 "Insert contents of file FILENAME into buffer after point.
5136 Set mark after the inserted text.
5138 This function is meant for the user to run interactively.
5139 Don't call it from programs! Use `insert-file-contents' instead.
5140 \(Its calling sequence is different; see its documentation)."
5146 "Append the contents of the region to the end of file FILENAME.
5147 When called from a function, expects three arguments,
5148 START, END and FILENAME. START and END are normally buffer positions
5149 specifying the part of the buffer to write.
5150 If START is nil, that means to use the entire buffer contents.
5151 If START is a string, then output that string to the file
5152 instead of any buffer contents; END is ignored.
5154 This does character code conversion and applies annotations
5155 like `write-region' does."
5161 "Return most recent backup file for FILENAME or nil if no backups exist."
5162 ;; `make-backup-file-name' will get us the right directory for
5163 ;; ordinary or numeric backups. It might create a directory for
5164 ;; backups as a side-effect, according to `backup-directory-alist'.
5171 tem)
5180 newest))
5183 "Rename current buffer to a similar name not already taken.
5184 This function is useful for creating multiple shell process buffers
5185 or multiple mail buffers, etc.
5187 Note that some commands, in particular those based on `compilation-mode'
5188 \(`compile', `grep', etc.) will reuse the current buffer if it has the
5189 appropriate mode even if it has been renamed. So as well as renaming
5190 the buffer, you also need to switch buffers before running another
5191 instance of such commands."
5199 ;; If the existing buffer name has a <NNN>,
5200 ;; which isn't part of the file name (if any),
5201 ;; then get rid of that.
5207 "Create the directory DIR and optionally any nonexistent parent dirs.
5208 If DIR already exists as a directory, signal an error, unless
5209 PARENTS is non-nil.
5211 Interactively, the default choice of directory to create is the
5212 current buffer's default directory. That is useful when you have
5213 visited a file in a nonexistent directory.
5215 Noninteractively, the second (optional) argument PARENTS, if
5216 non-nil, says whether to create parent directories that don't
5217 exist. Interactively, this happens by default.
5219 If creating the directory or directories fail, an error will be
5220 raised."
5223 nil nil)
5224 t))
5225 ;; If default-directory is a remote directory,
5226 ;; make sure we find its make-directory handler.
5234 create-list)
5236 ;; If directory is its own parent, then we can't
5237 ;; keep looping forever
5252 "Delete the directory named DIRECTORY. Does not follow symlinks.
5253 If RECURSIVE is non-nil, all files in DIRECTORY are deleted as well.
5254 TRASH non-nil means to trash the directory instead, provided
5255 `delete-by-moving-to-trash' is non-nil.
5257 When called interactively, TRASH is t if no prefix argument is
5258 given. With a prefix argument, TRASH is nil."
5265 "Move directory to trash: "
5267 default-directory default-directory nil nil))))
5273 nil)
5275 ;; If default-directory is a remote directory, make sure we find its
5276 ;; delete-directory handler.
5283 ;; Only move non-empty dir to trash if recursive deletion was
5284 ;; requested. This mimics the non-`delete-by-moving-to-trash'
5285 ;; case, where the operation fails in delete-directory-internal.
5286 ;; As `move-file-to-trash' trashes directories (empty or
5287 ;; otherwise) as a unit, we do not need to recurse here.
5289 ;; Check if directory is empty apart from "." and "..".
5294 ;; Otherwise, call ourselves recursively if needed.
5298 ;; This test is equivalent to
5299 ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
5300 ;; but more efficient
5304 ;; We do not want to delete "." and "..".
5310 "Return non-nil if files FILE1 and FILE2 name the same file.
5311 If FILE1 or FILE2 does not exist, the return value is unspecified."
5322 "Return non-nil if FILE is in DIR or a subdirectory of DIR.
5324 Return nil if DIR is not an existing directory."
5336 ;; A UNC on Windows systems, or a "super-root" on Apollo.
5351 "Copy DIRECTORY to NEWNAME. Both args must be strings.
5352 This function always sets the file modes of the output files to match
5353 the corresponding input file.
5355 The third arg KEEP-TIME non-nil means give the output files the same
5356 last-modified time as the old ones. (This works on only some systems.)
5358 A prefix arg makes KEEP-TIME non-nil.
5360 Noninteractively, the last argument PARENTS says whether to
5361 create parent directories if they don't exist. Interactively,
5362 this happens by default.
5364 If NEWNAME names an existing directory, copy DIRECTORY as a
5365 subdirectory there. However, if called from Lisp with a non-nil
5366 optional argument COPY-CONTENTS, copy the contents of DIRECTORY
5367 directly into NEWNAME instead."
5374 default-directory default-directory nil nil)
5375 current-prefix-arg t nil)))
5378 directory newname))
5379 ;; If default-directory is a remote directory, make sure we find its
5380 ;; copy-directory handler.
5385 newname keep-time parents copy-contents)
5387 ;; Compute target name.
5392 ;; If NEWNAME is not an existing directory, create it;
5393 ;; that is where we will copy the files of DIRECTORY.
5395 ;; If NEWNAME is an existing directory and COPY-CONTENTS
5396 ;; is nil, copy into NEWNAME/[DIRECTORY-BASENAME].
5401 newname))
5405 newname))
5408 ;; Copy recursively.
5410 ;; We do not want to copy "." and "..".
5412 directory-files-no-dot-files-regexp))
5422 ;; Set directory attributes.
5428 \f
5429 ;; At time of writing, only info uses this.
5431 "Return a copy of DIRS with all non-existent directories removed.
5432 The optional argument KEEP is a list of directories to retain even if
5433 they don't exist, and REJECT is a list of directories to remove from
5434 DIRS, even if they exist; REJECT takes precedence over KEEP.
5436 Note that membership in REJECT and KEEP is checked using simple string
5437 comparison."
5443 dirs)))
5445 \f
5448 "Function to use to revert this buffer.
5449 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
5450 which are the arguments that `revert-buffer' received.
5451 It also has access to the `preserve-modes' argument of `revert-buffer'
5452 via the `revert-buffer-preserve-modes' dynamic variable.
5454 For historical reasons, a value of nil means to use the default function.
5459 #'revert-buffer-insert-file-contents--default-function
5460 "Function to use to insert contents when reverting this buffer.
5461 The function receives two arguments: the first the nominal file name to use;
5462 the second is t if reading the auto-save file.
5464 The function is responsible for updating (or preserving) point.
5466 For historical reasons, a value of nil means to use the default function.
5470 "Default function to use for `buffer-stale-function'.
5471 This function ignores its argument.
5472 This returns non-nil if the current buffer is visiting a readable file
5473 whose modification time does not match that of the buffer.
5475 This function only handles buffers that are visiting files.
5476 Non-file buffers need a custom function"
5483 "Function to check whether a buffer needs reverting.
5484 This should be a function with one optional argument NOCONFIRM.
5485 Auto Revert Mode passes t for NOCONFIRM. The function should return
5486 non-nil if the buffer should be reverted. A return value of
5487 `fast' means that the need for reverting was not checked, but
5488 that reverting the buffer is fast. The buffer is current when
5489 this function is called.
5491 The idea behind the NOCONFIRM argument is that it should be
5492 non-nil if the buffer is going to be reverted without asking the
5493 user. In such situations, one has to be careful with potentially
5494 time consuming operations.
5496 For historical reasons, a value of nil means to use the default function.
5497 This should not be relied upon.
5499 For more information on how this variable is used by Auto Revert mode,
5503 "Normal hook for `revert-buffer' to run before reverting.
5504 The function `revert-buffer--default' runs this.
5508 "Normal hook for `revert-buffer' to run after reverting.
5509 Note that the hook value that it runs is the value that was in effect
5510 before reverting; that makes a difference if you have buffer-local
5511 hook functions.
5513 The function `revert-buffer--default' runs this.
5521 ;; `revert-buffer-function' was defined long ago to be a function of only
5522 ;; 2 arguments, so we have to use a dynbind variable to pass the
5523 ;; `preserve-modes' argument of `revert-buffer'.
5527 "Replace current buffer text with the text of the visited file on disk.
5528 This undoes all changes since the file was visited or saved.
5529 With a prefix argument, offer to revert from latest auto-save file, if
5530 that is more recent than the visited file.
5532 This command also implements an interface for special buffers
5533 that contain text which doesn't come from a file, but reflects
5534 some other data instead (e.g. Dired buffers, `buffer-list'
5535 buffers). This is done via the variable `revert-buffer-function'.
5536 In these cases, it should reconstruct the buffer contents from the
5537 appropriate data.
5539 When called from Lisp, the first argument is IGNORE-AUTO; only offer
5540 to revert from the auto-save file when this is nil. Note that the
5541 sense of this argument is the reverse of the prefix argument, for the
5542 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
5543 to nil.
5545 Optional second argument NOCONFIRM means don't ask for confirmation
5546 at all. (The variable `revert-without-query' offers another way to
5547 revert buffers without querying for confirmation.)
5549 Optional third argument PRESERVE-MODES non-nil means don't alter
5550 the files modes. Normally we reinitialize them using `normal-mode'.
5552 This function binds `revert-buffer-in-progress-p' non-nil while it operates.
5554 This function calls the function that `revert-buffer-function' specifies
5555 to do the work, with arguments IGNORE-AUTO and NOCONFIRM.
5556 The default function runs the hooks `before-revert-hook' and
5557 `after-revert-hook'."
5558 ;; I admit it's odd to reverse the sense of the prefix argument, but
5559 ;; there is a lot of code out there which assumes that the first
5560 ;; argument should be t to avoid consulting the auto-save file, and
5561 ;; there's no straightforward way to encourage authors to notice a
5562 ;; reversal of the argument sense. So I'm just changing the user
5563 ;; interface, but leaving the programmatic interface the same.
5568 ignore-auto noconfirm)))
5571 "Default function for `revert-buffer'.
5572 The arguments IGNORE-AUTO and NOCONFIRM are as described for `revert-buffer'.
5573 Runs the hooks `before-revert-hook' and `after-revert-hook' at the
5574 start and end.
5576 Calls `revert-buffer-insert-file-contents-function' to reread the
5577 contents of the visited file, with two arguments: the first is the file
5578 name, the second is non-nil if reading an auto-save file.
5580 This function only handles buffers that are visiting files.
5581 Non-file buffers need a custom function."
5586 buffer-auto-save-file-name
5591 buffer-auto-save-file-name
5592 buffer-file-name)))
5602 file-name)))
5604 ;; If file was backed up but has changed since,
5605 ;; we should make another backup.
5609 ;; Effectively copy the after-revert-hook status,
5610 ;; since after-find-file will clobber it.
5613 after-revert-hook))
5615 ;; FIXME: Throw away undo-log when preserve-modes is nil?
5619 file-name auto-save-p)
5620 ;; Recompute the truename in case changes in symlinks
5621 ;; have changed the truename.
5625 ;; Run after-revert-hook as it was before we reverted.
5629 local-hook)
5632 t)))))
5635 "Default function for `revert-buffer-insert-file-contents-function'.
5636 The function `revert-buffer--default' calls this.
5637 FILE-NAME is the name of the file. AUTO-SAVE-P is non-nil if this is
5638 an auto-save file."
5642 "File %s no longer exists!"
5644 file-name))
5647 "File %s no longer readable!"
5649 file-name))
5651 ;; Bind buffer-file-name to nil
5652 ;; so that we don't try to lock the file.
5658 ;; Auto-saved file should be read by Emacs's
5659 ;; internal coding.
5663 buffer-file-coding-system-explicit
5666 coding-system-for-read
5668 coding-system-for-read)
5670 ;; As a coding system suitable for multibyte
5671 ;; buffer is specified, make the current
5672 ;; buffer multibyte.
5675 ;; This force after-insert-file-set-coding
5676 ;; (called from insert-file-contents) to set
5677 ;; buffer-file-coding-system to a proper value.
5680 ;; Note that this preserves point in an intelligent way.
5684 nil nil t))
5686 nil nil t))))))
5689 "Recover the visited file--get contents from its last auto-save file."
5694 "Visit file FILE, but get contents from its last auto-save file."
5695 ;; Actually putting the file name in the minibuffer should be used
5696 ;; only rarely.
5697 ;; Not just because users often use the default.
5710 "*Directory*" nil
5721 ;; Use insert-directory-safely, not insert-directory,
5722 ;; because these files might not exist. In particular,
5723 ;; FILE might not exist if the auto-save file was for
5724 ;; a buffer that didn't visit a file, such as "*mail*".
5725 ;; The code in v20.x called `ls' directly, so we need
5726 ;; to emulate what `ls' did in that case.
5731 ;; Keep the current buffer-file-coding-system.
5733 ;; Auto-saved file should be read with special coding.
5742 "Recover auto save files from a previous Emacs session.
5743 This command first displays a Dired buffer showing you the
5744 previous sessions that you could recover from.
5745 To choose one, move point to the proper line and then type C-c C-c.
5746 Then you'll be asked about a number of files to recover."
5756 directory-files-no-dot-files-regexp
5758 t)
5769 ;; Each line starts with a space
5770 ;; so that Font Lock mode won't highlight the first character.
5773 " To delete a session file, type \
5779 "Choose one saved session to recover auto-save files from.
5780 This command is used in the special Dired buffer created by
5783 ;; Get the name of the session file to recover from.
5785 files
5791 ;; Read in the auto-save-list file.
5794 ;; Loop thru the text of that file
5795 ;; and get out the names of the files to recover.
5799 ;; This is a pair of lines for a non-file-visiting buffer.
5800 ;; Get the auto-save file name and manufacture
5801 ;; a "visited file name" from that.
5804 ;; If there is no auto-save file name, the
5805 ;; auto-save-list file is probably corrupted.
5818 ;; This pair of lines is a file-visiting
5819 ;; buffer. Use the visited file name.
5829 ;; Ignore a file if its auto-save file does not exist now.
5833 ;; The file contains a pair of line for each auto-saved buffer.
5834 ;; The first line of the pair contains the visited file name
5835 ;; or is empty if the buffer was not visiting a file.
5836 ;; The second line is the auto-save file name.
5844 files
5850 "Kill BUFFER if confirmed."
5858 "Kill some buffers. Asks the user whether to kill each one of them.
5859 Non-interactively, if optional argument LIST is non-nil, it
5860 specifies the list of buffers to kill, asking for approval for each one."
5868 ; if we killed the base buffer.
5875 "Kill buffers whose name matches the specified REGEXP.
5876 The optional second argument indicates whether to kill internal buffers too."
5885 \f
5887 "Adjust current buffer's auto save file name for current conditions.
5888 Also rename any existing auto save file, if it was made in this session."
5900 "Return file name to use for auto-saves of current buffer.
5901 Does not consider `auto-save-visited-file-name' as that variable is checked
5902 before calling this function. You can redefine this for customization.
5903 See also `auto-save-file-name-p'."
5911 result uniq)
5912 ;; Apply user-specified translations
5913 ;; to the file name.
5917 filename)
5927 filename))))
5932 ;; We truncate the file name to DOS 8+3 limits
5933 ;; before doing anything else, because the regexp
5934 ;; passed to string-match below cannot handle
5935 ;; extensions longer than 3 characters, multiple
5936 ;; dots, and other atrocities.
5941 fn)
5946 "#"
5949 ;; Make sure auto-save file names don't contain characters
5950 ;; invalid for the underlying filesystem.
5952 ;; Don't modify remote (ange-ftp) filenames
5955 result))))
5957 ;; Deal with buffers that don't have any associated files. (Mail
5958 ;; mode tends to create a good number of these.)
5962 file-name)
5963 ;; Restrict the characters used in the file name to those which
5964 ;; are known to be safe on all filesystems, url-encoding the
5965 ;; rest.
5966 ;; We do this on all platforms, because even if we are not
5967 ;; running on DOS/Windows, the current directory may be on a
5968 ;; mounted VFAT filesystem, such as a USB memory stick.
5972 ;; For multibyte characters, this will produce more than
5973 ;; 2 hex digits, so is not true URL encoding.
5977 ;; Generate the file name.
5983 ;; Try a few alternative directories, to get one we can
5984 ;; write it.
5990 ;; Don't modify remote (ange-ftp) filenames
5992 ;; The call to convert-standard-filename is in case
5993 ;; buffer-name includes characters not allowed by the
5994 ;; DOS/Windows filesystems. make-temp-file writes to the
5995 ;; file it creates, so we must fix the file name _before_
5996 ;; make-temp-file is called.
5998 fname))
6000 ;; make-temp-file creates the file,
6001 ;; but we don't want it to exist until we do an auto-save.
6005 file-name)))
6008 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
6009 FILENAME should lack slashes. You can redefine this for customization."
6011 \f
6013 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
6014 The generated regexp will match a filename only if the filename
6015 matches that wildcard according to shell rules. Only wildcards known
6016 by `sh' are supported."
6018 ;; Copy the initial run of non-special characters.
6021 ;; If no special characters, we're almost done.
6025 j)
6027 result
6048 ;; Found "[^". Insert a `\0' character
6049 ;; (which cannot happen in a filename)
6050 ;; into the character class, so that `^'
6051 ;; is not the first character after `[',
6052 ;; and thus non-special in a regexp.
6057 ;; I don't think `]' can appear in a
6058 ;; character class in a wildcard, but
6059 ;; let's be general here.
6066 i
6079 ;; Shell wildcards should match the entire filename,
6080 ;; not its part. Make the regexp say so.
6082 \f
6085 "Switches for `list-directory' to pass to `ls' for brief listing."
6091 "Switches for `list-directory' to pass to `ls' for verbose listing."
6096 "Expand wildcard pattern PATTERN.
6097 This returns a list of file names which match the pattern.
6098 Files are sorted in `string<' order.
6100 If PATTERN is written as an absolute file name,
6101 the values are absolute also.
6103 If PATTERN is written as a relative file name, it is interpreted
6104 relative to the current default directory, `default-directory'.
6105 The file names returned are normally also relative to the current
6106 default directory. However, if FULL is non-nil, they are absolute."
6110 ;; A list of all dirs that DIRPART specifies.
6111 ;; This can be more than one dir
6112 ;; if DIRPART contains wildcards.
6116 dirpart)))
6120 contents)
6125 ;; Filter out "." and ".."
6130 name))
6137 this-dir-contents)
6138 this-dir-contents)
6139 contents)))))
6140 contents)))
6142 ;; Let Tramp know that `file-expand-wildcards' does not need an advice.
6146 "Display a list of files in or matching DIRNAME, a la `ls'.
6147 DIRNAME is globbed by the shell if necessary.
6148 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
6149 Actions controlled by variables `list-directory-brief-switches'
6150 and `list-directory-verbose-switches'."
6154 nil default-directory nil)
6155 pfx)))
6157 list-directory-brief-switches))
6158 buffer)
6170 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
6178 "Quote characters special to the shell in PATTERN, leave wildcards alone.
6180 PATTERN is assumed to represent a file-name wildcard suitable for the
6181 underlying filesystem. For Unix and GNU/Linux, each character from the
6183 the parts of the pattern which don't include wildcard characters are
6184 quoted with double quotes.
6187 on Windows), so PATTERN can use them to quote wildcard characters that
6188 need to be passed verbatim to shell commands."
6192 ;; DOS/Windows don't allow `"' in file names. So if the
6193 ;; argument has quotes, we can safely assume it is already
6194 ;; quoted by the caller.
6196 ;; We quote [&()#$`'] in case their shell is a port of a
6197 ;; Unixy shell. We quote [,=+] because stock DOS and
6198 ;; Windows shells require that in some cases, such as
6199 ;; passing arguments to batch files that use positional
6200 ;; arguments like %1.
6202 pattern
6205 end)
6222 pattern))))
6229 "Program to get the amount of free space on a file system.
6230 We assume the output has the format of `df'.
6231 The value of this variable must be just a command name or file name;
6232 if you want to specify options, use `directory-free-space-args'.
6234 A value of nil disables this feature.
6236 If the function `file-system-info' is defined, it is always used in
6237 preference to the program given by this variable."
6243 "Options to use when running `directory-free-space-program'."
6248 "Return the amount of free space on directory DIR's file system.
6249 The return value is a string describing the amount of free
6250 space (normally, the number of free 1KB blocks).
6252 This function calls `file-system-info' if it is available, or
6253 invokes the program specified by `directory-free-space-program'
6254 and `directory-free-space-args'. If the system call or program
6255 is unsuccessful, or if DIR is a remote directory, this function
6256 returns nil."
6258 ;; Try to find the number of free blocks. Non-Posix systems don't
6259 ;; always have df, but might have an equivalent system call.
6268 ;; Avoid failure if the default directory does
6269 ;; not exist (Bug#2631, Bug#3911).
6273 nil t nil
6274 directory-free-space-args
6277 ;; Assume that the "available" column is before the
6278 ;; "capacity" column. Find the "%" and scan backward.
6282 "[[:space:]]+[^[:space:]]+%[^%]*$"
6289 ;; The following expression replaces `dired-move-to-filename-regexp'.
6293 ;; In some locales, month abbreviations are as short as 2 letters,
6294 ;; and they can be followed by ".".
6295 ;; In Breton, a month name can include a quote character.
6308 s "+"
6311 ;; Japanese MS-Windows ls-lisp has one-digit months, and
6312 ;; omits the Kanji characters after month and day-of-month.
6313 ;; On Mac OS X 10.3, the date format in East Asian locales is
6314 ;; day-of-month digits followed by month digits.
6320 ;; The "[0-9]" below requires the previous column to end in a digit.
6321 ;; This avoids recognizing `1 may 1997' as a date in the line:
6322 ;; -r--r--r-- 1 may 1997 1168 Oct 19 16:49 README
6324 ;; The "[BkKMGTPEZY]?" below supports "ls -alh" output.
6326 ;; For non-iso date formats, we add the ".*" in order to find
6327 ;; the last possible match. This avoids recognizing
6328 ;; `jservice 10 1024' as a date in the line:
6329 ;; drwxr-xr-x 3 jservice 10 1024 Jul 2 1997 esg-host
6331 ;; vc dired listings provide the state or blanks between file
6332 ;; permissions and date. The state is always surrounded by
6333 ;; parentheses:
6334 ;; -rw-r--r-- (modified) 2005-10-22 21:25 files.el
6335 ;; This is not supported yet.
6340 "Regular expression to match up to the file name in a directory listing.
6341 The default value is designed to recognize dates and times
6346 ;; insert-directory
6347 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
6348 ;; FULL-DIRECTORY-P is nil.
6349 ;; The single line of output must display FILE's name as it was
6350 ;; given, namely, an absolute path name.
6351 ;; - must insert exactly one line for each file if WILDCARD or
6352 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
6353 ;; before the file lines, plus optional text after the file lines.
6354 ;; Lines are delimited by "\n", so filenames containing "\n" are not
6355 ;; allowed.
6356 ;; File lines should display the basename.
6357 ;; - must be consistent with
6358 ;; - functions dired-move-to-filename, (these two define what a file line is)
6359 ;; dired-move-to-end-of-filename,
6360 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
6361 ;; dired-insert-headerline
6362 ;; dired-after-subdir-garbage (defines what a "total" line is)
6363 ;; - variable dired-subdir-regexp
6364 ;; - may be passed "--dired" as the first argument in SWITCHES.
6365 ;; Filename handlers might have to remove this switch if their
6366 ;; "ls" command does not support it.
6368 "Insert directory listing for FILE, formatted according to SWITCHES.
6369 Leaves point after the inserted text.
6370 SWITCHES may be a string of options, or a list of strings
6371 representing individual options.
6372 Optional third arg WILDCARD means treat FILE as shell wildcard.
6373 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
6374 switches do not contain `d', so that a full listing is expected.
6376 This works by running a directory listing program
6377 whose name is in the variable `insert-directory-program'.
6378 If WILDCARD, it also runs the shell specified by `shell-file-name'.
6380 When SWITCHES contains the long `--dired' option, this function
6381 treats it specially, for the sake of dired. However, the
6382 normally equivalent short `-D' option is just passed on to
6383 `insert-directory-program', as any other option."
6384 ;; We need the directory in order to find the right handler.
6389 wildcard full-directory-p)
6392 ;; Read the actual directory using `insert-directory-program'.
6393 ;; RESULT gets the status code.
6395 ;; putting text property `dired-filename, decode one
6396 ;; bunch by one to preserve that property.
6398 ;; This is to control encoding the arguments in call-process.
6402 default-file-name-coding-system))))
6405 ;; Run ls in the directory part of the file pattern
6406 ;; using the last component as argument.
6412 ;; NB since switches is passed to the shell, be
6413 ;; careful of malicious values, eg "-l;reboot".
6414 ;; See eg dired-safe-switches-p.
6416 shell-file-name nil t nil
6417 "-c"
6419 ""
6421 insert-directory-program
6422 " -d "
6424 switches
6426 " -- "
6427 ;; Quote some characters that have
6428 ;; special meanings in shells; but
6429 ;; don't quote the wildcards--we want
6430 ;; them to be special. We also
6431 ;; currently don't quote the quoting
6432 ;; characters in case people want to
6433 ;; use them explicitly to quote
6434 ;; wildcard characters.
6436 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
6437 ;; directory if FILE is a symbolic link.
6445 insert-directory-program nil t nil
6449 ;; Split the switches at any spaces so we can
6450 ;; pass separate options as separate args.
6452 ;; Avoid lossage if FILE starts with `-'.
6460 file))))))))
6462 ;; If we got "//DIRED//" in the output, it means we got a real
6463 ;; directory listing, even if `ls' returned nonzero.
6464 ;; So ignore any errors.
6477 ;; The first time ls returns an error,
6478 ;; find the version numbers of ls,
6479 ;; and set insert-directory-ls-version
6480 ;; to > if it is more than 5.2.1, < if it is less, nil if it
6481 ;; is equal or if the info cannot be obtained.
6482 ;; (That can mean it isn't GNU ls.)
6492 comparison)
6508 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
6512 ;; If `insert-directory-program' failed, signal an error.
6514 ;; Delete the error message it may have output.
6516 ;; On non-Posix systems, we cannot open a directory, so
6517 ;; don't even try, because that will always result in
6518 ;; the ubiquitous "Access denied". Instead, show the
6519 ;; command line so the user can try to guess what went wrong.
6524 insert-directory-program
6526 file result)
6527 ;; Unix. Access the file to get a suitable error.
6534 ;; The following overshoots by one line for an empty
6535 ;; directory listed with "--dired", but without "-a"
6536 ;; switch, where the ls output contains a
6537 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
6538 ;; We take care of that case later.
6546 error-lines)
6547 ;; Find all the lines that are error messages,
6548 ;; and record the bounds of each one.
6555 ;; Now read the numeric positions of file names.
6562 error-lines))
6565 error-lines)))
6567 ;; End is followed by \n or by " -> ".
6569 ;; It seems that we can't trust ls's output as to
6570 ;; byte positions of filenames.
6576 ;; Take care of the case where the ls output contains a
6577 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
6578 ;; and we went one line too far back (see above).
6583 ;; Now decode what read if necessary.
6585 file-name-coding-system
6586 default-file-name-coding-system
6588 coding-no-eol
6589 val pos)
6593 ;; If no coding system is specified or detection is
6594 ;; requested, detect the coding.
6608 ;; Force no eol conversion on a file name, so
6609 ;; that CR is preserved.
6617 ;; Try to insert the amount of free space.
6620 ;; First find the line to put it on.
6624 ;; Replace "total" with "used", to avoid confusion.
6630 "Convert `ls --dired' file name position value POS to a buffer position.
6631 File name position values returned in ls --dired output
6632 count only stdout; they don't count the error messages sent to stderr.
6633 So this function converts to them to real buffer positions.
6634 ERROR-LINES is a list of buffer positions of error message lines,
6635 of the form (START END)."
6639 pos)
6643 "Insert directory listing for FILE, formatted according to SWITCHES.
6645 Like `insert-directory', but if FILE does not exist, it inserts a
6646 message to that effect instead of signaling an error."
6649 ;; Simulate the message printed by `ls'.
6653 "Functions to call with no arguments to query about killing Emacs.
6654 If any of these functions returns nil, killing Emacs is canceled.
6655 `save-buffers-kill-emacs' calls these functions, but `kill-emacs',
6659 "How to ask for confirmation when leaving Emacs.
6660 If nil, the default, don't ask at all. If the value is non-nil, it should
6661 be a predicate function; for example `yes-or-no-p'."
6670 "Offer to save each buffer, then kill this Emacs process.
6671 With prefix ARG, silently save all file-visiting buffers without asking.
6672 If there are active processes where `process-query-on-exit-flag'
6673 returns non-nil, asks whether processes should be killed.
6674 Runs the members of `kill-emacs-query-functions' in turn and stops
6675 if any returns nil. If `confirm-kill-emacs' is non-nil, calls it."
6687 ;; process-list is not defined on MSDOS.
6689 active)
6707 ;; Query the user for other things, perhaps.
6714 "Offer to save each buffer, then kill the current connection.
6715 If the current frame has no client, kill Emacs itself.
6717 With prefix ARG, silently save all file-visiting buffers, then kill.
6719 If emacsclient was started with a list of filenames to edit, then
6720 only these files will be asked to be saved."
6725 \f
6726 ;; We use /: as a prefix to "quote" a file name
6727 ;; so that magic file name handlers will not apply to it.
6731 file-name-handler-alist))
6733 ;; We depend on being the last handler on the list,
6734 ;; so that anything else which does need handling
6735 ;; has been handled already.
6736 ;; So it is safe for us to inhibit *all* magic file name handlers.
6745 default-directory))
6746 ;; Get a list of the indices of the args which are file names.
6749 ;; The first six are special because they
6750 ;; return a file name. We want to include the /:
6751 ;; in the return value.
6752 ;; So just avoid stripping it in the first place.
6759 ;; `identity' means just return the first arg
6760 ;; not stripped of its quoting.
6762 ;; `add' means add "/:" to the result.
6765 ;; `unquote-then-quote' means set buffer-file-name
6766 ;; temporarily to unquoted filename.
6768 ;; List the arguments which are filenames.
6776 ;; For all other operations, treat the first argument only
6777 ;; as the file name.
6779 method
6780 ;; Copy ARGUMENTS so we can replace elements in it.
6784 ;; Strip off the /: from the file names that have it.
6792 "/"
6798 (`insert-file-contents
6804 (`unquote-then-quote
6809 \f
6810 ;; Symbolic modes and read-file-modes.
6813 "Convert CHAR to a numeric bit-mask for extracting mode bits.
6814 CHAR is in [ugoa] and represents the category of users (Owner, Group,
6815 Others, or All) for whom to produce the mask.
6816 The bit-mask that is returned extracts from mode bits the access rights
6817 for the specified category of users."
6825 "Convert CHAR to a numeric value of mode bits.
6826 CHAR is in [rwxXstugo] and represents symbolic access permissions.
6827 If CHAR is in [Xugo], the value is taken from FROM (or 0 if omitted)."
6834 ;; Rights relative to the previous file modes.
6845 "Convert a symbolic mode string specification to an equivalent number.
6847 WHO-MASK is the bit-mask specifying the category of users to which to
6848 apply the access permissions. See `file-modes-char-to-who'.
6849 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6850 RIGHTS request to add, remove, or set permissions based on existing ones,
6857 char-right)
6864 num-rights
6868 op char-right)))
6869 num-rights))
6872 "Convert symbolic file modes to numeric file modes.
6873 MODES is the string to convert, it should match
6875 See Info node `(coreutils)File permissions' for more information on this
6876 notation.
6877 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6878 MODES request to add, remove, or set permissions based on existing ones,
6892 num-who num-modes)
6895 num-modes)))
6898 "Read file modes in octal or symbolic notation and return its numeric value.
6900 ORIG-FILE is the name of a file on whose mode bits to base returned
6901 permissions if what user types requests to add, remove, or set permissions
6917 nil nil default)))
6926 ;; Trashcan handling.
6928 "Directory for `move-file-to-trash' to move files and directories to.
6929 This directory is only used when the function `system-move-file-to-trash'
6930 is not defined.
6931 Relative paths are interpreted relative to `default-directory'.
6932 If the value is nil, Emacs uses a freedesktop.org-style trashcan."
6942 "Move the file (or directory) named FILENAME to the trash.
6943 When `delete-by-moving-to-trash' is non-nil, this function is
6944 called by `delete-file' and `delete-directory' instead of
6945 deleting files outright.
6947 If the function `system-move-file-to-trash' is defined, call it
6948 with FILENAME as an argument.
6949 Otherwise, if `trash-directory' is non-nil, move FILENAME to that
6950 directory.
6951 Otherwise, trash FILENAME using the freedesktop.org conventions,
6952 like the GNOME, KDE and XFCE desktop environments. Emacs only
6956 ;; If `trash-directory' is non-nil, move the file there.
6960 trash-dir)))
6961 ;; We can't trash a parent directory of trash-directory.
6964 trash-dir filename))
6967 ;; Ensure that the trashed file-name is unique.
6974 ;; If `system-move-file-to-trash' is defined, use it.
6977 ;; Otherwise, use the freedesktop.org method, as specified at
6978 ;; http://freedesktop.org/wiki/Specifications/trash-spec
6989 ;; Check if we have permissions to delete.
6993 ;; The trashed file cannot be the trash dir or its parent.
6996 trash-files-dir filename))
6999 trash-info-dir filename))
7001 ;; Ensure that the trash directory exists; otherwise, create it.
7008 ;; Try to move to trash with .trashinfo undo information
7013 ;; Perform url-encoding on FN. For compatibility with
7014 ;; other programs (e.g. XFCE Thunar), allow literal "/"
7015 ;; for path separators.
7020 ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A
7021 ?B ?C ?D ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O
7034 fn))
7039 ;; Attempt to make .trashinfo file, trying up to 5
7040 ;; times. The .trashinfo file is opened with O_EXCL,
7041 ;; as per trash-spec 0.7, even if that can be a problem
7042 ;; on old NFS versions...
7046 trash-files-dir))
7048 success info-fn)
7053 trash-info-dir))
7061 ;; Uniquify new-fn. (Some file managers do not
7062 ;; like Emacs-style backup file names---e.g. bug
7063 ;; 170956 in Konqueror bug tracker.)
7068 ;; Finally, try to move the file to the trashcan.
7072 \f
7097 ;;; files.el ends here