| blob | 0985fd5f470074ee6769e5c5247da6a0d4a1e19b |
1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985-1987, 1992-2011 Free Software Foundation, Inc.
5 ;; Maintainer: FSF
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:
36 "Backups of edited data files."
40 "Finding files."
45 "Non-nil means delete auto-save file when a buffer is saved or killed.
47 Note that the auto-save file will not be deleted if the buffer is killed
48 when it has unsaved changes."
53 nil
54 "Alist of abbreviations for file directories.
55 A list of elements of the form (FROM . TO), each meaning to replace
56 FROM with TO when it appears in a directory name. This replacement is
57 done when setting up the default directory of a newly visited file.
59 FROM is matched against directory names anchored at the first
63 FROM and TO should be equivalent names, which refer to the
64 same directory. Do not use `~' in the TO strings;
65 they should be ordinary absolute directory names.
67 Use this feature when you have directories which you normally refer to
68 via absolute symbolic links. Make TO the name of the link, and FROM
69 the name it is linked to."
78 "Non-nil means make a backup of a file the first time it is saved.
79 This can be done by renaming the file or by copying.
81 Renaming means that Emacs renames the existing file so that it is a
82 backup file, then writes the buffer into a new file. Any other names
83 that the old file had will now refer to the backup file. The new file
84 is owned by you and its group is defaulted.
86 Copying means that Emacs copies the existing file into the backup
87 file, then writes the buffer on top of the existing file. Any other
88 names that the old file had will now refer to the new (edited) file.
89 The file's owner and group are unchanged.
91 The choice of renaming or copying is controlled by the variables
92 `backup-by-copying', `backup-by-copying-when-linked',
93 `backup-by-copying-when-mismatch' and
94 `backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
98 ;; Do this so that local variables based on the file name
99 ;; are not overridden by the major mode.
101 "Non-nil means don't make a backup, regardless of the other parameters.
102 This variable is intended for use by making it local to a buffer.
107 "Non-nil means always use copying to create backup files.
108 See documentation of variable `make-backup-files'."
113 "Non-nil means use copying to create backups for files with multiple names.
114 This causes the alternate names to refer to the latest version as edited.
115 This variable is relevant only if `backup-by-copying' is nil."
120 "Non-nil means create backups by copying if this preserves owner or group.
121 Renaming may still be used (subject to control of other variables)
122 when it would not result in changing the owner or group of the file;
123 that is, for files which are owned by you and whose group matches
124 the default for a new file created there by you.
125 This variable is relevant only if `backup-by-copying' is nil."
132 "Non-nil means create backups by copying to preserve a privileged owner.
133 Renaming may still be used (subject to control of other variables)
134 when it would not result in changing the owner of the file or if the owner
135 has a user id greater than the value of this variable. This is useful
136 when low-numbered uid's are used for special system users (such as root)
137 that must maintain ownership of certain files.
138 This variable is relevant only if `backup-by-copying' and
139 `backup-by-copying-when-mismatch' are nil."
144 "Predicate that looks at a file name and decides whether to make backups.
148 "Non-nil in a buffer means always offer to save buffer on exit.
149 Do so even if the buffer is not visiting a file.
150 Automatically local in all buffers."
156 "Non-nil means find a file under alternative names, in existing buffers.
157 This means if any existing buffer is visiting the file you want
158 under another name, you get the existing buffer instead of a new buffer."
163 "Non-nil means visit a file under its truename.
164 The truename of a file is found by chasing all links
165 both at the file level and at the levels of the containing directories."
171 "Specify which files should be reverted without query.
172 The value is a list of regular expressions.
173 If the file name matches one of these regular expressions,
174 then `revert-buffer' reverts the file without querying
175 if the file has changed on disk and you have not edited the buffer."
180 "The device number and file number of the file visited in the current buffer.
181 The value is a list of the form (FILENUM DEVNUM).
182 This pair of numbers uniquely identifies the file.
196 "The directory for writing small temporary files.
197 If non-nil, this directory is used instead of `temporary-file-directory'
198 by programs that create small temporary files. This is for systems that
199 have fast storage with limited space, such as a RAM disk."
204 ;; 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 "Non-nil means when saving a file that exists under several names
254 \(i.e., has multiple hardlinks), break the hardlink associated with
255 `buffer-file-name' and write to a new file, so that the other
256 instances of the file are not affected by the save.
258 If `buffer-file-name' refers to a symlink, do not break the symlink.
260 Unlike `file-precious-flag', `break-hardlink-on-save' is not advisory.
261 For example, if the directory in which a file is being saved is not
262 itself writable, then error instead of saving in some
263 hardlink-nonbreaking way.
265 See also `backup-by-copying' and `backup-by-copying-when-linked'."
271 "Control use of version numbers for backup files.
272 When t, make numeric backup versions unconditionally.
273 When nil, make them for files that have some already.
274 The value `never' means do not make them."
284 "When cleaning directory, number of versions to keep."
290 "If t, delete excess backup versions silently.
291 If nil, ask confirmation. Any other value prevents any trimming."
298 "Number of oldest versions to keep when a new numbered backup is made."
304 "Number of newest versions to keep when a new numbered backup is made.
305 Includes the new backup. Must be > 0"
311 "Whether to add a newline automatically at the end of the file.
313 A value of t means do this only when the file is about to be saved.
314 A value of `visit' means do this right after the file is visited.
315 A value of `visit-save' means do it at both of those times.
316 Any other non-nil value means ask user whether to add a newline, when saving.
317 A value of nil means don't add newlines.
319 Certain major modes set this locally to the value obtained
320 from `mode-require-final-newline'."
329 "Whether to add a newline at end of file, in certain major modes.
330 Those modes set `require-final-newline' to this value when you enable them.
331 They do so because they are often used for files that are supposed
332 to end in newlines, and the question is how to arrange that.
334 A value of t means do this only when the file is about to be saved.
335 A value of `visit' means do this right after the file is visited.
336 A value of `visit-save' means do it at both of those times.
337 Any other non-nil value means ask user whether to add a newline, when saving.
339 A value of nil means do not add newlines. That is a risky choice in this
340 variable since this value is used for modes for files that ought to have
341 final newlines. So if you set this to nil, you must explicitly check and
342 add a final newline, whenever you save a file that really needs one."
352 "Non-nil says by default do auto-saving of every file-visiting buffer."
358 ;; Don't put "\\2" inside expand-file-name, since it will be
359 ;; transformed to "/2" on DOS/Windows.
361 "Transforms to apply to buffer file name before making auto-save file name.
362 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
363 REGEXP is a regular expression to match against the file name.
364 If it matches, `replace-match' is used to replace the
365 matching part with REPLACEMENT.
366 If the optional element UNIQUIFY is non-nil, the auto-save file name is
367 constructed by taking the directory part of the replaced file-name,
368 concatenated with the buffer file name with all directory separators
369 changed to `!' to prevent clashes. This will not work
370 correctly if your filesystem truncates the resulting name.
372 All the transforms in the list are tried, in the order they are listed.
373 When one transform applies, its result is final;
374 no further transforms are tried.
376 The default value is set up to put the auto-save file into the
377 temporary directory (see the variable `temporary-file-directory') for
378 editing a remote file.
380 On MS-DOS filesystems without long names this variable is always
381 ignored."
389 "Non-nil means save word abbrevs too when files are saved.
390 If `silently', don't ask the user before saving."
395 "Non-nil means allow `find-file' to visit directories.
396 To visit the directory, `find-file' runs `find-directory-functions'."
401 "List of functions to try in sequence to visit a directory.
402 Each function is called with the directory name as the sole argument
403 and should return either a buffer or nil."
407 ;; FIXME: also add a hook for `(thing-at-point 'filename)'
409 "List of functions to try in sequence to get a file name at point.
410 Each function should return either nil or a file name found at the
411 location of point in the current buffer."
415 ;;;It is not useful to make this a local variable.
416 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
418 "List of functions to be called for `find-file' on nonexistent file.
419 These functions are called as soon as the error is detected.
420 Variable `buffer-file-name' is already set up.
425 ;;;It is not useful to make this a local variable.
426 ;;;(put 'find-file-hooks 'permanent-local t)
429 "List of functions to be called after a buffer is loaded from a file.
430 The buffer's local variables (if any) will have been processed before the
431 functions are called."
438 "List of functions to be called before writing out a buffer to a file.
439 If one of them returns non-nil, the file is considered already written
440 and the rest are not called.
441 These hooks are considered to pertain to the visited file.
442 So any buffer-local binding of this variable is discarded if you change
444 change the major mode.
446 This hook is not run if any of the functions in
447 `write-contents-functions' returns non-nil. Both hooks pertain
448 to how to save a buffer to file, for instance, choosing a suitable
449 coding system and setting mode bits. (See Info
450 node `(elisp)Saving Buffers'.) To perform various checks or
461 "List of functions to be called before writing out a buffer to a file.
462 If one of them returns non-nil, the file is considered already written
463 and the rest are not called and neither are the functions in
464 `write-file-functions'.
466 This variable is meant to be used for hooks that pertain to the
467 buffer's contents, not to the particular visited file; thus,
468 `set-visited-file-name' does not clear this variable; but changing the
469 major mode does clear it.
471 For hooks that _do_ pertain to the particular visited file, use
472 `write-file-functions'. Both this variable and
473 `write-file-functions' relate to how a buffer is saved to file.
474 To perform various checks or updates before the buffer is saved,
481 "Control use of local variables in files you visit.
482 The value can be t, nil, :safe, :all, or something else.
484 A value of t means file local variables specifications are obeyed
485 if all the specified variable values are safe; if any values are
486 not safe, Emacs queries you, once, whether to set them all.
487 \(When you say yes to certain values, they are remembered as safe.)
489 :safe means set the safe variables, and ignore the rest.
490 :all means set all variables, whether safe or not.
491 (Don't set it permanently to :all.)
492 A value of nil means always ignore the file local variables.
494 Any other value means always query you once whether to set them all.
495 \(When you say yes to certain values, they are remembered as safe, but
498 This variable also controls use of major modes specified in
499 a -*- line.
502 always obeys file local variable specifications and the -*- line,
503 and ignores this variable."
504 :risky t
513 "Like `enable-local-variables' but meant for buffer-local bindings.
514 The meaningful values are nil and non-nil. The default is non-nil.
515 If a major mode sets this to nil, buffer-locally, then any local
516 variables list in the file will be ignored.
518 This variable does not affect the use of major modes
523 The value can be t, nil or something else.
524 A value of t means obey `eval' variables.
525 A value of nil means ignore them; anything else means query."
526 :risky t
532 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
541 "Non-nil means buffers visiting files read-only do so in view mode.
542 In fact, this means that all read-only buffers normally have
543 View mode enabled, including buffers that are read-only because
544 you visit a file you cannot alter, and buffers you make read-only
550 "History list of file names entered in the minibuffer.
552 Maximum length of the history list is determined by the value
554 \f
557 "Provides support for ange-ftp host name completion.
558 Runs the usual ange-ftp hook, but only for completion operations."
559 ;; Having this here avoids the need to load ange-ftp when it's not
560 ;; really in use.
566 inhibit-file-name-handlers)))
574 "Convert a standard file's name to something suitable for the OS.
575 This means to guarantee valid names and perhaps to canonicalize
576 certain patterns.
578 FILENAME should be an absolute file name since the conversion rules
579 sometimes vary depending on the position in the file name. E.g. c:/foo
580 is a valid DOS file name, but c:/bar/c:/foo is not.
582 This function's standard definition is trivial; it just returns
583 the argument. However, on Windows and DOS, replace invalid
584 characters. On DOS, make sure to obey the 8.3 limitations.
585 In the native Windows build, turn Cygwin names into native names,
586 and also turn slashes into backslashes if the shell requires it (see
587 `w32-shell-dos-semantics').
589 See Info node `(elisp)Standard File Names' for more details."
594 ;; Replace invalid filename characters with !
598 name))
606 "Read directory name, prompting with PROMPT and completing in directory DIR.
607 Value is not expanded---you must call `expand-file-name' yourself.
608 Default name to DEFAULT-DIRNAME if user exits with the same
609 non-empty string that was inserted by this function.
610 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
611 or just DIR if INITIAL is nil.)
612 If the user exits with an empty minibuffer, this function returns
613 an empty string. (This can only happen if the user erased the
614 pre-inserted contents or if `insert-default-directory' is nil.)
615 Fourth arg MUSTMATCH non-nil means require existing directory's name.
616 Non-nil and non-t means also require confirmation after completion.
617 Fifth arg INITIAL specifies text to start with.
618 DIR should be an absolute directory name. It defaults to
619 the value of `default-directory'."
624 dir))
625 mustmatch initial
628 \f
630 "Show the current default directory."
635 "Value of the CDPATH environment variable, as a list.
639 "Explode a search path into a list of directory names.
640 Directories are separated by occurrences of `path-separator'
641 \(which is colon in GNU and GNU-like systems)."
642 ;; We could use split-string here.
650 nil
655 cd-list)))
658 "Change current directory to given absolute file name DIR."
659 ;; Put the name into directory syntax now,
660 ;; because otherwise expand-file-name may give some bad results.
662 ;; We used to additionally call abbreviate-file-name here, for an
663 ;; unknown reason. Problem is that most buffers are setup
664 ;; without going through cd-absolute and don't call
665 ;; abbreviate-file-name on their default-directory, so the few that
666 ;; do end up using a superficially different directory.
678 "Make DIR become the current buffer's default directory.
679 If your environment includes a `CDPATH' variable, try each one of
680 that list of directories (separated by occurrences of
681 `path-separator') when resolving a relative directory name.
682 The path separator is colon in GNU and GNU-like systems."
685 ;; FIXME: There's a subtle bug in the completion below. Seems linked
686 ;; to a fundamental difficulty of implementing `predicate' correctly.
687 ;; The manifestation is that TAB may list non-directories in the case where
688 ;; those files also correspond to valid directories (if your cd-path is (A/
689 ;; B/) and you have A/a a file and B/a a directory, then both `a' and `a/'
690 ;; will be listed as valid completions).
691 ;; This is because `a' (listed because of A/a) is indeed a valid choice
692 ;; (which will lead to the use of B/a).
697 cd-path nil))
706 default-directory default-directory
707 t))))
717 "Load the Lisp file named FILE."
718 ;; This is a case where .elc makes a lot of sense.
725 "Search for FILENAME through PATH.
726 If found, return the absolute file name of FILENAME, with its suffixes;
727 otherwise return nil.
728 PATH should be a list of directories to look in, like the lists in
729 `exec-path' or `load-path'.
730 If SUFFIXES is non-nil, it should be a list of suffixes to append to
733 If non-nil, PREDICATE is used instead of `file-readable-p'.
735 This function will normally skip directories, so if you want it to find
736 directories, make sure the PREDICATE function returns `dir-ok' for them.
738 PREDICATE can also be an integer to pass to the `access' system call,
739 in which case file-name handlers are ignored. This usage is deprecated.
740 For compatibility, PREDICATE can also be one of the symbols
741 `executable', `readable', `writable', or `exists', or a list of
742 one or more of those symbols."
753 "Do completion for file names passed to `locate-file'."
756 ;; FIXME: maybe we should use completion-file-name-table instead,
757 ;; tho at least for `load', the arg is passed through
758 ;; substitute-in-file-name for historical reasons.
768 ;; If we have files like "foo.el" and "foo.elc", we could load one of
769 ;; them with "foo.el", "foo.elc", or "foo", where just "foo" is the
770 ;; preferred way. So if we list all 3, that gives a lot of redundant
771 ;; entries for the poor soul looking just for "foo". OTOH, sometimes
772 ;; the user does want to pay attention to the extension. We try to
773 ;; diffuse this tension by stripping the suffix, except when the
774 ;; result is a single element (i.e. usually we only list "foo" unless
775 ;; it's the only remaining element in the list, in which case we do
776 ;; list "foo", "foo.elc" and "foo.el").
787 string-file dir))
792 ;; Switching from names to names+fullnames creates a non-monotonicity
793 ;; which can cause problems with things like partial-completion.
794 ;; To minimize the problem, filter out completion-regexp-list, so that
795 ;; M-x load-library RET t/x.e TAB finds some files. Also remove elements
796 ;; from `names' which only matched `string' when they still had
797 ;; their suffix.
799 ;; Remove duplicates of the first element, so that we can easily check
800 ;; if `names' really only contains a single element.
803 ;; There's no more than one matching non-suffixed element, so expand
804 ;; the list by adding the suffixed elements as well.
807 string-dir names string-file pred action)))))
810 "Do completion for file names passed to `locate-file'.
811 PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
814 string nil action))
819 "Regexp of directory names which stop the search in `locate-dominating-file'.
820 Any directory whose name matches this regexp will be treated like
821 a kind of root directory by `locate-dominating-file' which will stop its search
822 when it bumps into it.
823 The default regexp prevents fruitless and time-consuming attempts to find
824 special files in directories in which filenames are interpreted as hostnames,
827 ;; (defun locate-dominating-files (file regexp)
828 ;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
829 ;; Stop at the first parent where a matching file is found and return the list
830 ;; of files that that match in this directory."
831 ;; (catch 'found
832 ;; ;; `user' is not initialized yet because `file' may not exist, so we may
833 ;; ;; have to walk up part of the hierarchy before we find the "initial UID".
834 ;; (let ((user nil)
835 ;; ;; Abbreviate, so as to stop when we cross ~/.
836 ;; (dir (abbreviate-file-name (file-name-as-directory file)))
837 ;; files)
838 ;; (while (and dir
839 ;; ;; As a heuristic, we stop looking up the hierarchy of
840 ;; ;; directories as soon as we find a directory belonging to
841 ;; ;; another user. This should save us from looking in
842 ;; ;; things like /net and /afs. This assumes that all the
843 ;; ;; files inside a project belong to the same user.
844 ;; (let ((prev-user user))
845 ;; (setq user (nth 2 (file-attributes dir)))
846 ;; (or (null prev-user) (equal user prev-user))))
847 ;; (if (setq files (condition-case nil
848 ;; (directory-files dir 'full regexp 'nosort)
849 ;; (error nil)))
850 ;; (throw 'found files)
851 ;; (if (equal dir
852 ;; (setq dir (file-name-directory
853 ;; (directory-file-name dir))))
854 ;; (setq dir nil))))
855 ;; nil)))
858 "Look up the directory hierarchy from FILE for a file named NAME.
859 Stop at the first parent directory containing a file NAME,
860 and return the directory. Return nil if not found."
861 ;; We used to use the above locate-dominating-files code, but the
862 ;; directory-files call is very costly, so we're much better off doing
863 ;; multiple calls using the code in here.
864 ;;
865 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
866 ;; `name' in /home or in /.
869 ;; `user' is not initialized outside the loop because
870 ;; `file' may not exist, so we may have to walk up part of the
871 ;; hierarchy before we find the "initial UID". Note: currently unused
872 ;; (user nil)
873 try)
876 ;; FIXME: Disabled this heuristic because it is sometimes
877 ;; inappropriate.
878 ;; As a heuristic, we stop looking up the hierarchy of
879 ;; directories as soon as we find a directory belonging
880 ;; to another user. This should save us from looking in
881 ;; things like /net and /afs. This assumes that all the
882 ;; files inside a project belong to the same user.
883 ;; (let ((prev-user user))
884 ;; (setq user (nth 2 (file-attributes file)))
885 ;; (and prev-user (not (equal user prev-user))))
892 root))
896 "Search for COMMAND in `exec-path' and return the absolute file name.
897 Return nil if COMMAND is not found anywhere in `exec-path'."
898 ;; Use 1 rather than file-executable-p to better match the behavior of
899 ;; call-process.
903 "Load the Emacs Lisp library named LIBRARY.
904 This is an interface to the function `load'. LIBRARY is searched
905 for in `load-path', both with and without `load-suffixes' (as
906 well as `load-file-rep-suffixes').
908 See Info node `(emacs)Lisp Libraries' for more details.
909 See `load-file' for a different interface to `load'."
913 load-path
918 "Test whether FILE specifies a location on a remote system.
919 Returns nil or a string identifying the remote connection (ideally
920 a prefix of FILE). For example, the remote identification for filename
923 less reliable than accessing local files.
924 Furthermore, relative file names do not work across remote connections.
926 IDENTIFICATION specifies which part of the identification shall
927 be returned as string. IDENTIFICATION can be the symbol
928 `method', `user', `host' or `localname'; any other value is
929 handled like nil and means to return the complete identification
930 string.
932 If CONNECTED is non-nil, the function returns an identification only
933 if FILE is located on a remote system, and a connection is established
934 to that remote system.
936 `file-remote-p' will never open a connection on its own."
940 nil)))
943 "Whether to use the remote file-name cache for read access.
945 When `nil', always use the cached values.
946 When `t', never use them.
947 A number means use them for that amount of seconds since they were
948 cached.
950 File attributes of remote files are cached for better performance.
951 If they are changed out of Emacs' control, the cached values
952 become invalid, and must be invalidated.
954 In case a remote file is checked regularly, it might be
955 reasonable to let-bind this variable to a value less then the
956 time period between two checks.
957 Example:
959 (defun display-time-file-nonempty-p (file)
960 (let ((remote-file-name-inhibit-cache (- display-time-interval 5)))
961 (and (file-exists-p file)
962 (< 0 (nth 7 (file-attributes (file-chase-links file)))))))"
973 "Copy the file FILE into a temporary file on this machine.
974 Returns the name of the local copy, or nil, if FILE is directly
975 accessible."
976 ;; This formerly had an optional BUFFER argument that wasn't used by
977 ;; anything.
981 nil)))
984 "Return the truename of FILENAME.
985 If FILENAME is not absolute, first expands it against `default-directory'.
986 The truename of a file name is found by chasing symbolic links
987 both at the level of the file and at the level of the directories
988 containing it, until no links are left at any level.
991 ;; COUNTER and PREV-DIRS are only used in recursive calls.
992 ;; COUNTER can be a cons cell whose car is the count of how many
993 ;; more links to chase before getting an error.
994 ;; PREV-DIRS can be a cons cell whose car is an alist
995 ;; of truenames we've just recently computed.
1009 ;; For speed, remove the ange-ftp completion handler from the list.
1010 ;; We know it's not needed here.
1011 ;; For even more speed, do this only on the outermost call.
1018 ;; andrewi@harlequin.co.uk - none of the following code (except for
1019 ;; invoking the file-name handler) currently applies on Windows
1020 ;; (ie. there are no native symlinks), but there is an issue with
1021 ;; case differences being ignored by the OS, and short "8.3 DOS"
1022 ;; name aliases existing for all files. (The short names are not
1023 ;; reported by directory-files, but can be used to refer to files.)
1024 ;; It seems appropriate for file-truename to resolve these issues in
1025 ;; the most natural way, which on Windows is to call the function
1026 ;; `w32-long-file-name' - this returns the exact name of a file as
1027 ;; it is stored on disk (expanding short name aliases with the full
1028 ;; name in the process).
1031 ;; For file name that has a special handler, call handler.
1032 ;; This is so that ange-ftp can save time by doing a no-op.
1035 ;; If filename contains a wildcard, newname will be the old name.
1037 ;; If filename exists, use the long name. If it doesn't exist,
1038 ;; drill down until we find a directory that exists, and use
1039 ;; the long name of that, with the extra non-existent path
1040 ;; components concatenated.
1042 missing rest)
1045 ;; Include the preceding directory separator in the missing
1046 ;; part so subsequent recursion on the rest works.
1051 ""
1056 ;; If this file directly leads to a link, process that iteratively
1057 ;; so that we don't use lots of stack.
1063 ;; For file name that has a special handler, call handler.
1064 ;; This is so that ange-ftp can save time by doing a no-op.
1067 done t)
1069 target dirfile)
1070 ;; Get the truename of the directory.
1072 ;; If these are equal, we have the (or a) root directory.
1074 ;; If this is the same dir we last got the truename for,
1075 ;; save time--don't recalculate.
1085 done t)
1088 done t)
1089 ;; Put it back on the file name.
1091 ;; Is the file name the name of a link?
1094 ;; Yes => chase that link, then start all over
1095 ;; since the link may point to a directory name that uses links.
1096 ;; We can't safely use expand-file-name here
1097 ;; since target might look like foo/../bar where foo
1098 ;; is itself a link. Instead, we handle . and .. above.
1101 target
1103 done nil)
1104 ;; No, we are done!
1106 filename))
1109 "Chase links in FILENAME until a name that is not a link.
1110 Unlike `file-truename', this does not check whether a parent
1111 directory name is a symbolic link.
1112 If the optional argument LIMIT is a number,
1113 it means chase no more than that many links and then stop."
1121 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
1124 ;; Handle `..' by hand, since it needs to work in the
1125 ;; target of any directory symlink.
1126 ;; This code is not quite complete; it does not handle
1127 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
1131 ;; Chase links in the default dir of the symlink.
1135 ;; Now find the parent of that dir.
1139 newname))
1141 ;; A handy function to display file sizes in human-readable form.
1142 ;; See http://en.wikipedia.org/wiki/Kibibyte for the reference.
1144 "Produce a string showing FILE-SIZE in human-readable form.
1146 Optional second argument FLAVOR controls the units and the display format:
1148 If FLAVOR is nil or omitted, each kilobyte is 1024 bytes and the produced
1150 If FLAVOR is `si', each kilobyte is 1000 bytes and the produced suffixes
1152 If FLAVOR is `iec', each kilobyte is 1024 bytes and the produced suffixes
1155 1024.0
1158 ;; none, kilo, mega, giga, tera, peta, exa, zetta, yotta
1164 "%.1f%s%s"
1166 file-size
1168 "K"
1173 "Create a temporary file.
1174 The returned file name (created by appending some random characters at the end
1175 of PREFIX, and expanding against `temporary-file-directory' if necessary),
1176 is guaranteed to point to a newly created empty file.
1177 You can then use `write-region' to write new data into the file.
1179 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1181 If SUFFIX is non-nil, add that at the end of the file name."
1183 file)
1186 ;; Create temp files with strict access rights. It's easy to
1187 ;; loosen them later, whereas it's impossible to close the
1188 ;; time-window of loose permissions otherwise.
1196 temporary-file-directory)
1198 temporary-file-directory))))
1204 nil)
1206 ;; the file was somehow created by someone else between
1207 ;; `make-temp-name' and `write-region', let's try again.
1208 nil)
1209 file)
1210 ;; Reset the umask.
1214 "Change the encoding of FILE's name from CODING to NEW-CODING.
1215 The value is a new name of FILE.
1216 Signals a `file-already-exists' error if a file of the new name
1217 already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
1218 is non-nil. A number as fourth arg means request confirmation if
1219 the new name already exists. This is what happens in interactive
1220 use with M-x."
1223 default-file-name-coding-system))
1225 from-coding to-coding)
1227 ;; We provide the default coding only when it seems that
1228 ;; the filename is correctly decoded by the default
1229 ;; coding.
1235 filename default-coding)
1236 default-coding))
1240 ;; We provide the default coding only when a user is going to
1241 ;; change the encoding not from the default coding.
1245 filename from-coding)))
1248 filename from-coding default-coding)
1249 default-coding)))
1253 default-file-name-coding-system))
1254 ;; FILE should have been decoded by DEFAULT-CODING.
1258 ;; Suppress further encoding.
1263 newname))
1264 \f
1266 "Whether confirmation is requested before visiting a new file or buffer.
1267 If nil, confirmation is not requested.
1268 If the value is `after-completion', confirmation is only
1269 requested if the user called `minibuffer-complete' right before
1270 `minibuffer-complete-and-exit'.
1271 Any other non-nil value means to request confirmation.
1273 This affects commands like `switch-to-buffer' and `find-file'."
1281 "Whether to request confirmation before visiting a new file or buffer.
1282 The variable `confirm-nonexistent-file-or-buffer' determines the
1283 return value, which may be passed as the REQUIRE-MATCH arg to
1284 `read-buffer' or `find-file-read-args'."
1292 "Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
1293 BODY should use the minibuffer at most once.
1294 Recursive uses of the minibuffer are unaffected (FUN is not
1295 called additional times).
1297 This macro actually adds an auxiliary function that calls FUN,
1298 rather than FUN itself, to `minibuffer-setup-hook'."
1304 ;; Clear out this hook so it does not interfere
1305 ;; with any recursive minibuffer usage.
1316 t))
1319 "Edit file FILENAME.
1320 Switch to a buffer visiting file FILENAME,
1321 creating one if none already exists.
1322 Interactively, the default if you just type RET is the current directory,
1323 but the visited file name is available through the minibuffer history:
1324 type M-n to pull it into the minibuffer.
1326 You can visit files on remote machines by specifying something
1327 like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
1328 also visit local files as a different user by specifying
1329 /sudo::FILE for the file name.
1330 See the Info node `(tramp)Filename Syntax' in the Tramp Info
1331 manual, for more about this.
1333 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1334 expand wildcards (if any) and visit multiple files. You can
1335 suppress wildcard expansion by setting `find-file-wildcards' to nil.
1337 To visit a file without any kind of conversion and without
1348 "Edit file FILENAME, in another window.
1351 an existing one. See the function `display-buffer'.
1353 Interactively, the default if you just type RET is the current directory,
1354 but the visited file name is available through the minibuffer history:
1355 type M-n to pull it into the minibuffer.
1357 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1358 expand wildcards (if any) and visit multiple files."
1371 "Edit file FILENAME, in another frame.
1374 an existing one. See the function `display-buffer'.
1376 Interactively, the default if you just type RET is the current directory,
1377 but the visited file name is available through the minibuffer history:
1378 type M-n to pull it into the minibuffer.
1380 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1381 expand wildcards (if any) and visit multiple files."
1394 "Edit the existing file FILENAME.
1396 file names with wildcards."
1405 "Edit file FILENAME but don't allow changes.
1419 value))
1422 "Edit file FILENAME in another window but don't allow changes.
1436 value))
1439 "Edit file FILENAME in another frame but don't allow changes.
1453 value))
1456 "Find file FILENAME as a replacement for the file in the next window.
1457 This command does not select that window.
1461 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1462 expand wildcards (if any) and replace the file with multiple files."
1473 "Find alternate file: " file-dir nil
1475 t))))
1485 "Find file FILENAME, select its buffer, kill previous buffer.
1486 If the current buffer now contains an empty file that you just visited
1487 \(presumably by mistake), use this command to visit the file you really want.
1491 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1492 expand wildcards (if any) and replace the file with multiple files.
1494 If the current buffer is an indirect buffer, or the base buffer
1495 for one or more indirect buffers, the other buffer(s) are not
1496 killed."
1505 "Find alternate file: " file-dir nil
1507 t)))
1522 ;; Run `kill-buffer-hook' here. It needs to happen before
1523 ;; variables like `buffer-file-name' etc are set to nil below,
1524 ;; because some of the hooks that could be invoked
1525 ;; (e.g., `save-place-to-alist') depend on those variables.
1526 ;;
1527 ;; Note that `kill-buffer-hook' is not what queries whether to
1528 ;; save a modified buffer visiting a file. Rather, `kill-buffer'
1529 ;; asks that itself. Thus, there's no need to temporarily do
1530 ;; `(set-buffer-modified-p nil)' before running this hook.
1532 ;; Okay, now we can end-of-life the old buffer.
1539 ;; This prevents us from finding the same buffer
1540 ;; if we specified the same file again.
1544 ;; Likewise for dired buffers.
1548 ;; This executes if find-file gets an error
1549 ;; and does not really find anything.
1550 ;; We put things back as they were.
1551 ;; If find-file actually finds something, we kill obuf below.
1560 ;; We already ran these; don't run them again.
1563 \f
1565 "Create a suitably named buffer for visiting FILENAME, and return it.
1566 FILENAME (sans directory) is used unchanged if that name is free;
1567 otherwise a string <2> or <3> or ... is appended to get an unused name.
1568 Spaces at the start of FILENAME (sans directory) are removed."
1577 "Create and return a buffer with a name based on NAME.
1578 Choose the buffer's name using `generate-new-buffer-name'."
1582 "Regexp to match the automounter prefix in a directory name."
1590 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1592 home directory is a root directory) and removes automounter prefixes
1593 \(see the variable `automount-dir-prefix')."
1594 ;; Get rid of the prefixes added by the automounter.
1601 ;; Avoid treating /home/foo as /home/Foo during `~' substitution.
1602 ;; To fix this right, we need a `file-name-case-sensitive-p'
1603 ;; function, but we don't have that yet, so just guess.
1606 ;; If any elt of directory-abbrev-alist matches this name,
1607 ;; abbreviate accordingly.
1613 ;; Compute and save the abbreviated homedir name.
1614 ;; We defer computing this until the first time it's needed, to
1615 ;; give time for directory-abbrev-alist to be set properly.
1616 ;; We include a slash at the end, to avoid spurious matches
1617 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1624 ;; If FILENAME starts with the abbreviated homedir,
1625 ;; make it start with `~' instead.
1627 ;; If the home dir is just /, don't change it.
1630 ;; MS-DOS root directories can come with a drive letter;
1631 ;; Novell Netware allows drive letters beyond `Z:'.
1639 filename)))
1642 "List of logical names for which visiting shouldn't save the true dirname."
1647 "Return the buffer visiting file FILENAME (a string).
1648 This is like `get-file-buffer', except that it checks for any buffer
1649 visiting the same file, possibly under a different name.
1650 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1651 and others are ignored.
1652 If there is no such live buffer, return nil."
1665 found)
1675 ;; Verify this buffer's file number
1676 ;; still belongs to its file.
1679 attributes)
1683 found))))
1684 \f
1686 "Non-nil means file-visiting commands should handle wildcards.
1687 For example, if you specify `*.c', that would visit all the files
1688 whose names match the pattern."
1694 "Non-nil means suppress warning messages for symlinked files.
1695 When nil, Emacs prints a warning when visiting a file that is already
1696 visited, but with a different name. Setting this option to t
1697 suppresses this warning."
1703 "Maximum size of file above which a confirmation is requested.
1704 When nil, never request confirmation."
1711 "If file SIZE larger than `large-file-warning-threshold', allow user to abort.
1712 OP-TYPE specifies the file operation being performed (for message to user)."
1721 "Read file FILENAME into a buffer and return the buffer.
1722 If a buffer exists visiting FILENAME, return that one, but
1723 verify that the file has not changed since visited or saved.
1724 The buffer is not selected, just returned to the caller.
1725 Optional second arg NOWARN non-nil means suppress any warning messages.
1726 Optional third arg RAWFILE non-nil means the file is read literally.
1727 Optional fourth arg WILDCARDS non-nil means do wildcard processing
1728 and visit all the matching files. When wildcards are actually
1729 used and expanded, return a list of buffers that are visiting
1730 the various files."
1737 'find-directory-functions
1740 filename)))
1743 find-file-wildcards
1757 ;; Find any buffer for a file which has same truename.
1759 ;; Let user know if there is a buffer with the same truename.
1763 find-file-suppress-same-file-warnings
1767 ;; Optionally also find that buffer.
1770 ;; Check to see if the file looks uncommonly large.
1774 ;; We are using an existing buffer.
1781 ;; Certain files should be reverted automatically
1782 ;; if they have changed on disk and not in the buffer.
1790 found))
1800 "File %s changed on disk. Discard your edits? "
1805 "File %s changed on disk. Discard your edits in %s? "
1813 ;; Check if a formerly read-only file has become
1814 ;; writable and vice versa, but if the buffer agrees
1815 ;; with the new state of the file, that is ok too.
1823 buffer-file-name
1832 ;; It is confusing to ask whether to visit
1833 ;; non-literally if they have the file in
1834 ;; hexl-mode or image-mode.
1840 "The file %s is already visited normally,
1841 and you have edited the buffer. Now you have asked to visit it literally,
1842 meaning no coding system handling, format conversion, or local variables.
1843 Emacs can only visit a file in one way at a time.
1845 Do you want to save the file, and visit it literally instead? "
1846 "The file %s is already visited literally,
1847 meaning no coding system handling, format conversion, or local variables.
1848 You have edited the buffer. Now you have asked to visit the file normally,
1849 but Emacs can only visit a file in one way at a time.
1856 rawfile truename number))
1860 "\
1861 Do you want to discard your changes, and visit the file literally now? "
1862 "\
1865 rawfile truename number)
1871 "The file %s is already visited normally.
1872 You have asked to visit it literally,
1873 meaning no coding system decoding, format conversion, or local variables.
1874 But Emacs can only visit a file in one way at a time.
1876 Do you want to revisit the file literally now? "
1877 "The file %s is already visited literally,
1878 meaning no coding system decoding, format conversion, or local variables.
1879 You have asked to visit it normally,
1880 but Emacs can only visit a file in one way at a time.
1885 rawfile truename number)
1888 ;; Return the buffer we are using.
1889 buf)
1890 ;; Create a new buffer.
1892 ;; find-file-noselect-1 may use a different buffer.
1894 rawfile truename number))))))
1900 ;; Needed in case we are re-visiting the file with a different
1901 ;; text representation.
1918 filename)))
1919 ;; Unconditionally set error
1929 filename)))
1930 ;; Run find-file-not-found-functions until one returns non-nil.
1932 ;; If they fail too, set error.
1934 ;; Record the file's truename, and maybe use that as visited name.
1942 ;; Set buffer's default directory to that of the file.
1944 ;; Turn off backup files for certain file names. Since
1945 ;; this is a permanent local, the major mode won't eliminate it.
1960 \f
1962 "Like `insert-file-contents', but only reads in the file literally.
1963 A buffer may be modified in several ways after reading into the buffer,
1964 to Emacs features such as format decoding, character code
1965 conversion, `find-file-hook', automatic uncompression, etc.
1967 This function ensures that none of these modifications will take place."
1975 nil))
1978 inhibit-file-name-handlers))
1991 filename)))
1992 ;; Check whether the file is uncommonly large
2003 "Insert contents of file FILENAME into buffer after point with no conversion.
2005 This function is meant for the user to run interactively.
2006 Don't call it from programs! Use `insert-file-contents-literally' instead.
2007 \(Its calling sequence is different; see its documentation)."
2012 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
2013 This has the `permanent-local' property, which takes effect if you
2018 "Visit file FILENAME with no conversion of any kind.
2019 Format conversion and character code conversion are both disabled,
2020 and multibyte characters are disabled in the resulting buffer.
2021 The major mode used is Fundamental mode regardless of the file name,
2022 and local variable specifications in the file are ignored.
2023 Automatic uncompression and adding a newline at the end of the
2024 file due to `require-final-newline' is also disabled.
2026 You cannot absolutely rely on this function to result in
2027 visiting the file literally. If Emacs already has a buffer
2028 which is visiting the file, you get the existing buffer,
2029 regardless of whether it was created literally or not.
2031 In a Lisp program, if you want to be sure of accessing a file's
2032 contents literally, you should create a temporary buffer and then read
2033 the file contents into it using `insert-file-contents-literally'."
2036 "Find file literally: " nil default-directory
2039 \f
2041 _after-find-file-from-revert-buffer
2042 nomodes)
2043 "Called after finding a file and by the default revert function.
2044 Sets buffer mode, parses local variables.
2045 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
2046 error in reading the file. WARN non-nil means warn if there
2047 exists an auto-save file more recent than the visited file.
2048 NOAUTO means don't mess with auto-save mode.
2049 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER is ignored
2050 \(see `revert-buffer-in-progress-p' for similar functionality).
2051 Fifth arg NOMODES non-nil means don't alter the file's modes.
2052 Finishes by calling the functions in `find-file-hook'
2053 unless NOMODES is non-nil."
2056 nil
2066 ;; No need to warn if buffer is auto-saved
2067 ;; under the name of the visited file.
2069 auto-save-visited-file-name))
2072 buffer-file-name))
2092 ;; Make people do a little extra work (C-x C-q)
2093 ;; before altering a backup file.
2096 ;; When a file is marked read-only,
2097 ;; make the buffer read-only even if root is looking at it.
2105 ;; If requested, add a newline at the end of the file.
2115 view-read-only
2121 "Eval BODY and turn any error into a FORMAT message.
2122 FORMAT can have a %s escape which will be replaced with the actual error.
2123 If `debug-on-error' is set, errors are not caught, so that you can
2124 debug them.
2125 Avoid using a large BODY since it is duplicated."
2134 "Choose the major mode for this buffer automatically.
2135 Also sets up any specified local variables of the file.
2136 Uses the visited file name, the -*- line, and the local variables spec.
2138 This function is called automatically from `find-file'. In that case,
2139 we may set up the file-specified mode and local variables,
2140 depending on the value of `enable-local-variables'.
2141 In addition, if `local-enable-local-variables' is nil, we do
2142 not set local variables (though we do notice a mode specified with -*-.)
2144 `enable-local-variables' is ignored if you run `normal-mode' interactively,
2145 or from Lisp without specifying the optional argument FIND-FILE;
2146 in that case, this function acts as if `enable-local-variables' were t."
2150 ;; FIXME this is less efficient than it could be, since both
2151 ;; s-a-m and h-l-v may parse the same regions, looking for "mode:".
2156 ;; Turn font lock off and on, to make sure it takes account of
2157 ;; whatever file local variables are relevant to it.
2159 ;; Font-lock-mode (now in font-core.el) can be ON when
2160 ;; font-lock.el still hasn't been loaded.
2170 "Non-nil means to try second pass through `auto-mode-alist'.
2171 This means that if the first case-sensitive search through the alist fails
2172 to find a matching major mode, a second case-insensitive search is made.
2173 On systems with case-insensitive file names, this variable is ignored,
2174 since only a single case-insensitive search through the alist is made."
2180 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
2181 ;; c++-mode, java-mode and more) are added through autoload
2182 ;; directives in that file. That way is discouraged since it
2183 ;; spreads out the definition of the initial value.
2227 ;; Less common extensions come here
2228 ;; so more common ones above are found faster.
2236 ;; Besides .gdbinit, gdb documents other names to be usable for init
2237 ;; files, cross-debuggers can use something like
2238 ;; .PROCESSORNAME-gdbinit so that the host and target gdbinit files
2239 ;; don't interfere with each other.
2277 ;; The list of archive file extensions should be in sync with
2278 ;; `auto-coding-alist' with `no-conversion' coding system.
2284 ;; Mailer puts message to be edited in
2285 ;; /tmp/Re.... or Message
2288 ;; some news reader is reported to use this
2299 ;; .emacs or .gnus or .viper following a directory delimiter in
2300 ;; Unix, MSDOG or VMS syntax.
2303 ;; _emacs following a directory delimiter
2304 ;; in MsDos syntax
2308 ;; Linux-2.6.9 uses some different suffix for linker scripts:
2309 ;; "ld", "lds", "lds.S", "lds.in", "ld.script", and "ld.script.balo".
2310 ;; eCos uses "ld" and "ldi". Netbsd uses "ldscript.*".
2313 ;; .xs is also used for ld scripts, but seems to be more commonly
2314 ;; associated with Perl .xs files (C with Perl bindings). (Bug#7071)
2316 ;; Explained in binutils ld/genscripts.sh. Eg:
2317 ;; A .x script file is the default script.
2318 ;; A .xr script is for linking without relocation (-r flag). Etc.
2322 ;; Common Lisp ASDF package system.
2329 ("\\.\\(?:PDF\\|DVI\\|OD[FGPST]\\|DOCX?\\|XLSX?\\|PPTX?\\|pdf\\|dvi\\|od[fgpst]\\|docx?\\|xlsx?\\|pptx?\\)\\'" . doc-view-mode-maybe)
2340 ;; Windows candidates may be opened case sensitively on Unix
2346 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
2347 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
2348 ;; ChangeLog.old etc. Other change-log-mode entries are above;
2349 ;; this has lower priority to avoid matching changelog.sgml etc.
2351 ;; either user's dot-files or under /etc or some such
2353 ;; alas not all ~/.*rc files are like this
2354 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
2359 ;; this contains everything twice, with space and with colon :-(
2361 ;; Get rid of any trailing .n.m and try again.
2362 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
2363 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
2364 ;; Using mode nil rather than `ignore' would let the search continue
2365 ;; through this list (with the shortened name) rather than start over.
2368 ;; This should come after "in" stripping (e.g. config.h.in).
2369 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
2371 ;; The following should come after the ChangeLog pattern
2372 ;; for the sake of ChangeLog.1, etc.
2373 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
2375 "Alist of filename patterns vs corresponding major mode functions.
2376 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
2377 \(NON-NIL stands for anything that is not nil; the value does not matter.)
2378 Visiting a file whose name matches REGEXP specifies FUNCTION as the
2379 mode function to use. FUNCTION will be called, unless it is nil.
2381 If the element has the form (REGEXP FUNCTION NON-NIL), then after
2382 calling FUNCTION (if it's not nil), we delete the suffix that matched
2383 REGEXP and search the list again for another match.
2385 If the file name matches `inhibit-first-line-modes-regexps',
2386 then `auto-mode-alist' is not processed.
2388 The extensions whose FUNCTION is `archive-mode' should also
2389 appear in `auto-coding-alist' with `no-conversion' coding system.
2391 See also `interpreter-mode-alist', which detects executable script modes
2392 based on the interpreters they specify to run,
2397 "Select Conf mode or XML mode according to start of file."
2407 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
2408 ;; and pike-mode) are added through autoload directives in that
2409 ;; file. That way is discouraged since it spreads out the
2410 ;; definition of the initial value.
2450 "Alist mapping interpreter names to major modes.
2451 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
2452 Each element looks like (INTERPRETER . MODE).
2453 If INTERPRETER matches the name of the interpreter specified in the first line
2454 of a script, mode MODE is enabled.
2462 "List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
2463 When checking `inhibit-first-line-modes-regexps', we first discard
2469 "Regexp matching interpreters, for file mode determination.
2470 This regular expression is matched against the first line of a file
2471 to determine the file's mode in `set-auto-mode'. If it matches, the file
2472 is assumed to be interpreted by the interpreter matched by the second group
2473 of the regular expression. The mode is then determined as the mode
2477 "Alist of buffer beginnings vs. corresponding major mode functions.
2478 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2479 After visiting a file, if REGEXP matches the text at the beginning of the
2480 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2481 call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
2482 major mode.
2484 If FUNCTION is nil, then it is not called. (That is a way of saying
2492 ;; The < comes before the groups (but the first) to reduce backtracking.
2493 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
2494 ;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
2498 comment-re "*"
2501 . html-mode)
2503 ;; These two must come after html, because they are more general:
2508 . sgml-mode)
2511 "Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
2512 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2513 After visiting a file, if REGEXP matches the text at the beginning of the
2514 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2515 call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
2516 have not specified a mode for this file.
2522 "Upper limit on `magic-mode-alist' regexp matches.
2526 "Select major mode appropriate for current buffer.
2528 To find the right major mode, this function checks for a -*- mode tag,
2529 checks for a `mode:' entry in the Local Variables section of the file,
2530 checks if it uses an interpreter listed in `interpreter-mode-alist',
2531 matches the buffer beginning against `magic-mode-alist',
2532 compares the filename against the entries in `auto-mode-alist',
2533 then matches the buffer beginning against `magic-fallback-mode-alist'.
2535 If `enable-local-variables' is nil, this function does not check for
2536 any mode: tag anywhere in the file.
2538 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2539 set the major mode only if that would change it. In other words
2540 we don't actually set it to the same mode the buffer already has."
2541 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2543 ;; Once we drop the deprecated feature where mode: is also allowed to
2544 ;; specify minor-modes (ie, there can be more than one "mode:), we can
2545 ;; remove this section and just let (hack-local-variables t) handle it.
2546 ;; Find a -*- mode tag.
2553 ;; Find all specifications for the `mode:' variable
2554 ;; and execute them left to right.
2566 modes)))
2567 ;; Simple -*-MODE-*- case.
2570 modes))))
2571 ;; If we found modes to use, invoke them now, outside the save-excursion.
2579 ;; continuing would call minor modes again, toggling them off
2582 enable-local-variables
2589 ;; If we didn't, look for an interpreter specified in the first line.
2590 ;; As a special case, allow for things like "#!/bin/env perl", which
2591 ;; finds the interpreter anywhere in $PATH.
2598 ;; Map interpreter name to a mode, signalling we're done at the
2599 ;; same time.
2601 interpreter-mode-alist))
2602 ;; If we found an interpreter mode to use, invoke it now.
2605 ;; Next try matching the buffer beginning against magic-mode-alist.
2619 ;; Next compare the filename against the entries in auto-mode-alist.
2624 ;; Remove remote file name identification.
2628 ;; Remove backup-suffixes from file name.
2631 ;; Find first matching alist entry.
2634 ;; System is case-insensitive.
2638 ;; System is case-sensitive.
2640 ;; First match case-sensitively.
2644 ;; Fallback to case-insensitive match.
2658 ;; Next try matching the buffer beginning against magic-fallback-mode-alist.
2673 ;; When `keep-mode-if-same' is set, we are working on behalf of
2674 ;; set-visited-file-name. In that case, if the major mode specified is the
2675 ;; same one we already have, don't actually reset it. We don't want to lose
2676 ;; minor modes such as Font Lock.
2678 "Apply MODE and return it.
2679 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2680 any aliases and compared to current major mode. If they are the
2681 same, do nothing and return nil."
2687 mode)))
2690 "Find the -*- spec in the buffer.
2691 Call with point at the place to start searching from.
2692 If one is found, set point to the beginning
2693 and return the position of the end.
2694 Otherwise, return nil; point may be changed."
2697 ;; Don't look for -*- if this file name matches any
2698 ;; of the regexps in inhibit-first-line-modes-regexps.
2706 sufs)
2714 ;; If the file begins with "#!"
2715 ;; (exec interpreter magic), look
2716 ;; for mode frobs in the first two
2717 ;; lines. You cannot necessarily
2718 ;; put them in the first line of
2719 ;; such a file without screwing up
2720 ;; the interpreter invocation.
2721 ;; The same holds for
2722 ;; '\"
2723 ;; in man pages (preprocessor
2724 ;; magic for the `man' program).
2735 end))))
2736 \f
2737 ;;; Handling file local variables
2741 file-local-variables-alist dir-local-variables-alist)
2746 "Normal hook run after processing a file's local variables specs.
2747 Major modes can use this to examine user-specified local variables
2751 "List variable-value pairs that are considered safe.
2752 Each element is a cons cell (VAR . VAL), where VAR is a variable
2753 symbol and VAL is a value that is considered safe."
2754 :risky t
2759 ;; This should be here at least as long as Emacs supports write-file-hooks.
2763 "Expressions that are considered safe in an `eval:' local variable.
2764 Add expressions to this list if you want Emacs to evaluate them, when
2765 they appear in an `eval' local variable specification, without first
2766 asking you for confirmation."
2767 :risky t
2772 ;; Risky local variables:
2775 buffer-auto-save-file-name
2776 buffer-file-name
2777 buffer-file-truename
2778 buffer-undo-list
2779 debugger
2780 default-text-properties
2781 eval
2782 exec-directory
2783 exec-path
2784 file-name-handler-alist
2785 frame-title-format
2786 global-mode-string
2787 header-line-format
2788 icon-title-format
2789 inhibit-quit
2790 load-path
2791 max-lisp-eval-depth
2792 max-specpdl-size
2793 minor-mode-map-alist
2794 minor-mode-overriding-map-alist
2795 mode-line-format
2796 mode-name
2797 overriding-local-map
2798 overriding-terminal-local-map
2799 process-environment
2800 standard-input
2801 standard-output
2802 unread-command-events))
2804 ;; Safe local variables:
2805 ;;
2806 ;; For variables defined by major modes, the safety declarations can go into
2807 ;; the major mode's file, since that will be loaded before file variables are
2808 ;; processed.
2809 ;;
2810 ;; For variables defined by minor modes, put the safety declarations in the
2811 ;; file defining the minor mode after the defcustom/defvar using an autoload
2812 ;; cookie, e.g.:
2813 ;;
2814 ;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
2815 ;;
2816 ;; Otherwise, when Emacs visits a file specifying that local variable, the
2817 ;; minor mode file may not be loaded yet.
2818 ;;
2819 ;; For variables defined in the C source code the declaration should go here:
2841 "Alist of file-local variable settings in the current buffer.
2842 Each element in this list has the form (VAR . VALUE), where VAR
2843 is a file-local variable (a symbol) and VALUE is the value
2844 specified. The actual value in the buffer may differ from VALUE,
2850 "Alist of directory-local variable settings in the current buffer.
2851 Each element in this list has the form (VAR . VALUE), where VAR
2852 is a directory-local variable (a symbol) and VALUE is the value
2853 specified in .dir-locals.el. The actual value in the buffer
2854 may differ from VALUE, if it is changed by the major or minor modes,
2859 "Normal hook run before setting file-local variables.
2860 It is called after checking for unsafe/risky variables and
2861 setting `file-local-variables-alist', and before applying the
2862 variables stored in `file-local-variables-alist'. A hook
2863 function is allowed to change the contents of this alist.
2865 This hook is called only if there is at least one file-local
2869 "Get confirmation before setting up local variable values.
2870 ALL-VARS is the list of all variables to be set up.
2871 UNSAFE-VARS is the list of those that aren't marked as safe or risky.
2872 RISKY-VARS is the list of those that are marked as risky.
2873 If these settings come from directory-local variables, then
2874 DIR-NAME is the name of the associated directory. Otherwise it is nil."
2876 nil
2883 unsafe-vars))
2887 prompt char)
2895 ", and variables that are risky (**)."
2903 y -- to apply the local variables list.
2907 ! -- to apply the local variables list, and permanently mark these
2919 ;; Make strings with embedded whitespace easier to read.
2927 ""
2942 ;; When this is called from desktop-restore-file-buffer,
2943 ;; coding-system-for-read may be non-nil. Reset it before
2944 ;; writing to .emacs.
2948 'safe-local-variable-values
2949 safe-local-variable-values))))
2953 "Return local variables specified in the -*- line.
2954 Returns an alist of elements (VAR . VAL), where VAR is a variable
2955 and VAL is the specified value. Ignores any specification for
2956 `mode:' and `coding:' (which should have already been handled
2957 by `set-auto-mode' and `set-auto-coding', respectively).
2958 Throws an error if the -*- line is malformed.
2960 If MODE-ONLY is non-nil, just returns the symbol specifying the
2961 mode, if there is one, otherwise nil."
2965 result)
2967 nil)
2969 ;; Simple form: "-*- MODENAME -*-".
2973 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
2974 ;; (last ";" is optional).
2975 ;; If MODE-ONLY, just check for `mode'.
2976 ;; Otherwise, parse the -*- line into the RESULT alist.
2983 ;; There used to be a downcase here,
2984 ;; but the manual didn't say so,
2985 ;; and people want to set var names that aren't all lc.
2991 ;; It is traditional to ignore
2992 ;; case when checking for `mode' in set-auto-mode,
2993 ;; so we must do that here as well.
2994 ;; That is inconsistent, but we're stuck with it.
2995 ;; The same can be said for `coding' in set-auto-coding.
3005 'eval
3010 result)))))
3013 "Filter local variable settings, querying the user if necessary.
3014 VARIABLES is the alist of variable-value settings. This alist is
3015 filtered based on the values of `ignored-local-variables',
3016 `enable-local-eval', `enable-local-variables', and (if necessary)
3017 user interaction. The results are added to
3018 `file-local-variables-alist', without applying them.
3019 If these settings come from directory-local variables, then
3020 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3021 ;; Find those variables that we may want to save to
3022 ;; `safe-local-variable-values'.
3028 ;; Ignore any variable in `ignored-local-variables'.
3029 nil)
3030 ;; Obey `enable-local-eval'.
3038 ;; Ignore duplicates (except `mode') in the present list.
3040 ;; Accept known-safe variables.
3044 ;; The variable is either risky or unsafe:
3051 ;; Query, unless all vars are safe or user wants no querying.
3057 risky-vars dir-name))
3068 "Parse and put into effect this buffer's local variables spec.
3069 Uses `hack-local-variables-apply' to apply the variables.
3072 is specified, and return the corresponding mode symbol, or nil.
3073 In this case, we try to ignore minor-modes, and only return a
3074 major-mode."
3077 result)
3083 ;; If MODE-ONLY is non-nil, and the prop line specifies a mode,
3084 ;; then we're done, and have no need to scan further.
3086 mode-only)
3087 ;; Look for "Local variables:" line in last page.
3095 ;; suffix is what comes after "local variables:" in its line.
3096 ;; prefix is what comes before "local variables:" in its line.
3106 beg)
3110 endpos
3116 nil t))
3117 ;; This used to be an error, but really all it means is
3118 ;; that this may simply not be a local-variables section,
3119 ;; so just ignore it.
3129 ;; Discard the prefix.
3134 ;; Discard the suffix.
3144 ;; Find the variable name; strip whitespace.
3153 val val2)
3154 ;; Read the variable value.
3161 ;; Specifying minor-modes via mode: is
3162 ;; deprecated, but try to reject them anyway.
3170 'eval
3175 ;; Now we've read all the local variables.
3176 ;; If MODE-ONLY is non-nil, return whether the mode was specified.
3178 ;; Otherwise, set the variables.
3184 "Apply the elements of `file-local-variables-alist'.
3185 If there are any elements, runs `before-hack-local-variables-hook',
3186 then calls `hack-one-local-variable' to apply the alist elements one by one.
3187 Finishes by running `hack-local-variables-hook', regardless of whether
3188 the alist is empty or not.
3190 Note that this function ignores a `mode' entry if it specifies the same
3191 major mode as the buffer already has."
3193 ;; Any 'evals must run in the Right sequence.
3202 "Non-nil if SYM is safe as a file-local variable with value VAL.
3203 It is safe if any of these conditions are met:
3205 * There is a matching entry (SYM . VAL) in the
3206 `safe-local-variable-values' user option.
3208 * The `safe-local-variable' property of SYM is a function that
3209 evaluates to a non-nil value with VAL as an argument."
3213 ;; If the function signals an error, that means it
3214 ;; can't assure us that the value is safe.
3218 "Non-nil if SYM could be dangerous as a file-local variable.
3219 It is dangerous if either of these conditions are met:
3221 * Its `risky-local-variable' property is non-nil.
3227 ;; If this is an alias, check the base name.
3247 "Return t if it is safe to eval EXP when it is found in a file."
3249 ;; Detect certain `put' expressions.
3256 lisp-indent-function
3257 scheme-indent-function))
3258 ;; Only allow safe values (not functions).
3263 ;; Only allow indirect form specs.
3264 ;; During bootstrapping, edebug-basic-spec might not be
3265 ;; defined yet.
3269 ;; Allow expressions that the user requested.
3271 ;; Certain functions can be allowed with safe arguments
3272 ;; or can specify verification functions to try.
3274 ;; Allow (minor)-modes calls with no arguments.
3275 ;; This obsoletes the use of "mode:" for such things. (Bug#8613)
3284 ok))
3292 ok))))))))
3295 "Set local variable VAR with value VAL.
3296 If VAR is `mode', call `VAL-mode' as a function unless it's
3297 already the major mode."
3304 ;; A minor mode must be passed an argument.
3305 ;; Otherwise, if the user enables the minor mode in a
3306 ;; major mode hook, this would toggle it off.
3312 ;; Make sure the string has no text properties.
3313 ;; Some text properties can get evaluated in various ways,
3314 ;; so it is risky to put them on with a local variable list.
3318 \f
3319 ;;; Handling directory-local variables, aka project settings.
3325 "List of cached directory roots for directory-local variable classes.
3326 Each element in this list has the form (DIR CLASS MTIME).
3327 DIR is the name of the directory.
3328 CLASS is the name of a variable class (a symbol).
3329 MTIME is the recorded modification time of the directory-local
3330 variables file associated with this entry. This time is a list
3331 of two integers (the same format as `file-attributes'), and is
3332 used to test whether the cache entry is still valid.
3333 Alternatively, MTIME can be nil, which means the entry is always
3337 "Return the variable list for CLASS."
3341 "Collect directory-local variables from MODE-VARIABLES.
3342 VARIABLES is the initial list of variables.
3343 Returns the new list."
3348 ;; If variables are specified more than once, only use the last. (Why?)
3349 ;; The pseudo-variables mode and eval are different (bug#3430).
3352 ;; Need a new cons in case we setcdr later.
3356 "Collect entries from CLASS-VARIABLES into VARIABLES.
3357 ROOT is the root directory of the project.
3358 Return the new variables list."
3361 ;; FIXME: Why not use file-relative-name?
3368 ;; Don't include this in the previous condition, because we
3369 ;; want to filter all strings before the next condition.
3383 ;; TODO someone might want to extend this to allow
3384 ;; integer values for subdir, where N means
3385 ;; variables apply to this directory and N levels
3386 ;; below it (0 == nil).
3389 alist variables))))))))
3391 ;; The file's content might be invalid (e.g. have a merge conflict), but
3392 ;; that shouldn't prevent the user from opening the file.
3394 nil))))
3397 "Declare that the DIRECTORY root is an instance of CLASS.
3398 DIRECTORY is the name of a directory, a string.
3399 CLASS is the name of a project class, a symbol.
3400 MTIME is either the modification time of the directory-local
3401 variables file that defined this class, or nil.
3403 When a file beneath DIRECTORY is visited, the mode-specific
3404 variables from CLASS are applied to the buffer. The variables
3405 for a class are defined using `dir-locals-set-class-variables'."
3412 "Map the type CLASS to a list of variable settings.
3413 CLASS is the project class, a symbol. VARIABLES is a list
3414 that declares directory-local variables for the class.
3415 An element in VARIABLES is either of the form:
3416 (MAJOR-MODE . ALIST)
3417 or
3418 (DIRECTORY . LIST)
3420 In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
3421 whose elements are of the form (VARIABLE . VALUE).
3423 In the second form, DIRECTORY is a directory name (a string), and
3424 LIST is a list of the form accepted by the function.
3426 When a file is visited, the file's class is found. A directory
3427 may be assigned a class using `dir-locals-set-directory-class'.
3428 Then variables are set in the file's buffer according to the
3429 class' LIST. The list is processed in order.
3431 * If the element is of the form (MAJOR-MODE . ALIST), and the
3432 buffer's major mode is derived from MAJOR-MODE (as determined
3433 by `derived-mode-p'), then all the variables in ALIST are
3434 applied. A MAJOR-MODE of nil may be used to match any buffer.
3435 `make-local-variable' is called for each variable before it is
3436 set.
3438 * If the element is of the form (DIRECTORY . LIST), and DIRECTORY
3439 is an initial substring of the file's directory, then LIST is
3440 applied by recursively following these rules."
3447 "File that contains directory-local variables.
3448 It has to be constant to enforce uniform values
3452 "Find the directory-local variables for FILE.
3453 This searches upward in the directory tree from FILE.
3454 It stops at the first directory that has been registered in
3455 `dir-locals-directory-cache' or contains a `dir-locals-file'.
3456 If it finds an entry in the cache, it checks that it is valid.
3457 A cache entry with no modification time element (normally, one that
3458 has been assigned directly using `dir-locals-set-directory-class', not
3459 set from a file) is always valid.
3460 A cache entry based on a `dir-locals-file' is valid if the modification
3461 time stored in the cache matches the current file modification time.
3462 If not, the cache entry is cleared so that the file will be re-read.
3464 This function returns either nil (no directory local variables found),
3465 or the matching entry from `dir-locals-directory-cache' (a list),
3466 or the full path to the `dir-locals-file' (a string) in the case
3467 of no valid cache entry."
3472 dir-locals-file))
3475 ;; `locate-dominating-file' may have abbreviated the name.
3478 ;; Find the best cached value in `dir-locals-directory-cache'.
3490 ;; Found a potential cache entry. Check validity.
3491 ;; A cache entry with no MTIME is assumed to always be valid
3492 ;; (ie, set directly, not from a dir-locals file).
3493 ;; Note, we don't bother to check that there is a matching class
3494 ;; element in dir-locals-class-alist, since that's done by
3495 ;; dir-locals-set-directory-class.
3502 ;; This cache entry is OK.
3503 dir-elt
3504 ;; This cache entry is invalid; clear it.
3507 ;; Return the first existing dir-locals file. Might be the same
3508 ;; as dir-elt's, might not (eg latter might have been deleted).
3509 locals-file)
3510 ;; No cache entry.
3511 locals-file)))
3514 "Load a variables FILE and register a new class and instance.
3515 FILE is the name of the file holding the variables to apply.
3516 The new class name is the same as the directory in which FILE
3517 is found. Returns the new class name."
3527 class-name)))
3530 "Read per-directory local variables for the current buffer.
3531 Store the directory-local variables in `dir-local-variables-alist'
3532 and `file-local-variables-alist', without applying them."
3535 ;; Find the variables file.
3562 \f
3565 However, the mode will not be changed if
3566 \(1) a local variables list or the `-*-' line specifies a major mode, or
3568 \ not suitable for ordinary files, or
3569 \(3) the new file name does not particularly specify any mode."
3574 "Change name of file visited in current buffer to FILENAME.
3575 This also renames the buffer to correspond to the new file.
3576 The next time the buffer is saved it will go in the newly specified file.
3577 FILENAME nil or an empty string means mark buffer as not visiting any file.
3578 Remember to delete the initial contents of the minibuffer
3579 if you wish to pass an empty string as the argument.
3581 The optional second argument NO-QUERY, if non-nil, inhibits asking for
3582 confirmation in the case where another buffer is already visiting FILENAME.
3584 The optional third argument ALONG-WITH-FILE, if non-nil, means that
3585 the old visited file has been renamed to the new name FILENAME."
3593 nil
3608 filename)))
3618 ;; If new-name == old-name, renaming would add a spurious <2>
3619 ;; and it's considered as a feature in rename-buffer.
3625 ;; Abbreviate the file names of the buffer.
3634 nil)))
3635 ;; write-file-functions is normally used for things like ftp-find-file
3636 ;; that visit things that are not local files as if they were files.
3637 ;; Changing to visit an ordinary local file instead should flush the hook.
3642 ;; If buffer was read-only because of version control,
3643 ;; that reason is gone now, so make it writable.
3647 ;; Turn off backup files for certain file names.
3648 ;; Since this is a permanent local, the major mode won't eliminate it.
3650 backup-enable-predicate
3656 ;; If auto-save was not already on, turn it on if appropriate.
3660 ;; If auto save is on, start using a new name.
3661 ;; We deliberately don't rename or delete the old auto save
3662 ;; for the old visited file name. This is because perhaps
3663 ;; the user wants to save the new state and then compare with the
3664 ;; previous state from the auto save file.
3667 ;; Rename the old auto save file if any.
3674 ;; Update the major mode, if the file name determines it.
3676 ;; Don't change the mode if it is special.
3679 ;; Don't change the mode if the local variable list specifies it.
3685 "Write current buffer into file FILENAME.
3686 This makes the buffer visit that file, and marks it as not modified.
3688 If you specify just a directory name as FILENAME, that means to use
3689 the default file name but in that directory. You can also yank
3690 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
3692 If the buffer is not already visiting a file, the default file name
3693 for the output file is the buffer name.
3695 If optional second arg CONFIRM is non-nil, this function
3696 asks for confirmation before overwriting an existing file.
3697 Interactively, confirmation is required unless you supply a prefix argument."
3698 ;; (interactive "FWrite file: ")
3702 nil nil nil nil)
3706 default-directory)
3707 nil nil))
3711 ;; If arg is just a directory,
3712 ;; use the default file name, but in that directory.
3723 ;; Make buffer writable if file is writable.
3728 ;; It's likely that the VC status at the new location is different from
3729 ;; the one at the old location.
3731 \f
3733 "Make a backup of the disk file visited by the current buffer, if appropriate.
3734 This is normally done before saving the buffer the first time.
3736 A backup may be done by renaming or by copying; see documentation of
3737 variable `make-backup-files'. If it's done by renaming, then the file is
3738 no longer accessible under its old name.
3740 The value is non-nil after a backup was made by renaming.
3741 It has the form (MODES SELINUXCONTEXT BACKUPNAME).
3742 MODES is the result of `file-modes' on the original
3743 file; this means that the caller, after saving the buffer, should change
3744 the modes of the new file to agree with the old modes.
3745 SELINUXCONTEXT is the result of `file-selinux-context' on the original
3746 file; this means that the caller, after saving the buffer, should change
3747 the SELinux context of the new file to agree with the old context.
3748 BACKUPNAME is the backup file name, which is the old file renamed."
3755 backup-info backupname targets setmodes)
3756 ;; If specified name is a symbolic link, chase it to the target.
3757 ;; Thus we make the backups in the directory where the real file is.
3762 ;; (if (file-directory-p buffer-file-name)
3763 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
3767 ;; If have old versions to maybe delete,
3768 ;; ask the user to confirm now, before doing anything.
3769 ;; But don't actually delete til later.
3774 real-file-name)))))
3777 ;; Actually write the back up file.
3780 ; (file-symlink-p buffer-file-name)
3781 backup-by-copying
3782 ;; Don't rename a suid or sgid file.
3797 ;; rename-file should delete old backup.
3801 ;; If trouble writing the backup, write it in
3802 ;; .emacs.d/%backup%.
3805 backupname)
3809 ;; Now delete the old versions, if desired.
3816 setmodes)
3823 ;; Create temp files with strict access rights. It's easy to
3824 ;; loosen them later, whereas it's impossible to close the
3825 ;; time-window of loose permissions otherwise.
3828 ;; Try to overwrite old backup first.
3836 nil)
3838 ;; The file was somehow created by someone else between
3839 ;; `delete-file' and `copy-file', so let's try again.
3840 ;; rms says "I think there is also a possible race
3841 ;; condition for making backup files" (emacs-devel 20070821).
3842 nil)))
3843 ;; Reset the umask.
3852 ;; The last ~[[:digit]]+ matches relative versions in git,
3853 ;; e.g. `foo.js.~HEAD~1~'.
3854 "Regular expression matching the backup/version part of a file name.
3858 "Return file NAME sans backup versions or strings.
3859 This is a separate procedure so your site-init or startup file can
3860 redefine it.
3861 If the optional argument KEEP-BACKUP-VERSION is non-nil,
3862 we do not remove backup version numbers, only true file version numbers.
3863 See also `file-name-version-regexp'."
3870 name))))))
3873 "Return t if deleting FILE and rewriting it would preserve the owner."
3878 ;; Return t if the file doesn't exist, since it's true that no
3879 ;; information would be lost by an (attempted) delete and create.
3882 ;; Files created on Windows by Administrator (RID=500)
3883 ;; have the Administrators group (RID=544) recorded as
3884 ;; their owner. Rewriting them will still preserve the
3885 ;; owner.
3891 The extension, in a file name, is the part that follows the last `.',
3892 except that a leading `.', if any, doesn't count."
3895 directory)
3899 ;; Don't use expand-file-name here; if DIRECTORY is relative,
3900 ;; we don't want to expand it.
3903 filename))))
3907 The extension, in a file name, is the part that follows the last `.',
3908 excluding version numbers and backup suffixes,
3909 except that a leading `.', if any, doesn't count.
3910 Return nil for extensionless file names such as `foo'.
3911 Return the empty string for file names such as `foo.'.
3913 If PERIOD is non-nil, then the returned value includes the period
3914 that delimits the extension, and if FILENAME has no extension,
3925 "A function to use instead of the default `make-backup-file-name'.
3926 A value of nil gives the default `make-backup-file-name' behavior.
3928 This could be buffer-local to do something special for specific
3929 files. If you define it, you may need to change `backup-file-name-p'
3930 and `file-name-sans-versions' too.
3932 See also `backup-directory-alist'."
3938 "Alist of filename patterns and backup directory names.
3939 Each element looks like (REGEXP . DIRECTORY). Backups of files with
3940 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
3941 relative or absolute. If it is absolute, so that all matching files
3942 are backed up into the same directory, the file names in this
3943 directory will be the full name of the file backed up with all
3944 directory separators changed to `!' to prevent clashes. This will not
3945 work correctly if your filesystem truncates the resulting name.
3947 For the common case of all backups going into one directory, the alist
3949 directory name.
3951 If this variable is nil, or it fails to match a filename, the backup
3952 is made in the original file's directory.
3954 On MS-DOS filesystems without long names this variable is always
3955 ignored."
3961 "Default `backup-enable-predicate' function.
3962 Checks for files in `temporary-file-directory',
3963 `small-temporary-file-directory', and /tmp."
3966 ;; Directory is under temporary-file-directory.
3971 ;; Directory is under /tmp.
3976 0 nil
3978 ;; Directory is under small-temporary-file-directory.
3983 "Create the non-numeric backup file name for FILE.
3984 Normally this will just be the file's name with `~' appended.
3985 Customization hooks are provided as follows.
3987 If the variable `make-backup-file-name-function' is non-nil, its value
3988 should be a function which will be called with FILE as its argument;
3989 the resulting name is used.
3991 Otherwise a match for FILE is sought in `backup-directory-alist'; see
3992 the documentation of that variable. If the directory for the backup
3993 doesn't exist, it is created."
4007 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
4009 elt backup-directory abs-backup-directory)
4014 alist nil)))
4015 ;; If backup-directory is relative, it should be relative to the
4016 ;; file's directory. By expanding explicitly here, we avoid
4017 ;; depending on default-directory.
4026 abs-backup-directory nil))))
4028 file
4032 ;; Normalize DOSish file names: downcase the drive
4033 ;; letter, if any, and replace the leading "x:" with
4034 ;; "/drive_x".
4037 ;; Replace any invalid file-name characters (for the
4038 ;; case of backing up remote files).
4042 "drive_"
4045 ""
4048 ;; Make the name unique by substituting directory
4049 ;; separators. It may not really be worth bothering about
4050 ;; doubling `!'s in the original name...
4055 backup-directory))
4060 "Return non-nil if FILE is a backup file name (numeric or not).
4061 This is a separate function so you can redefine it for customization.
4062 You may need to redefine `file-name-sans-versions' as well."
4067 ;; This is used in various files.
4068 ;; The usage of backup-extract-version-start is not very clean,
4069 ;; but I can't see a good alternative, so as of now I am leaving it alone.
4071 "Given the name of a numeric backup file, FN, return the backup number.
4072 Uses the free variable `backup-extract-version-start', whose value should be
4073 the index in the name where the version number begins."
4080 "Find a file name for a backup file FN, and suggestions for deletions.
4081 Value is a list whose car is the name for the backup file
4082 and whose cdr is a list of old versions to consider deleting now.
4083 If the value is nil, don't make a backup.
4084 Uses `backup-directory-alist' in the same way as does
4085 `make-backup-file-name'."
4087 ;; Run a handler for this function so that ange-ftp can refuse to do it.
4091 ;; We don't support numbered backups on plain MS-DOS
4092 ;; when long file names are unavailable.
4102 possibilities deserve-versions-p versions)
4105 base-versions
4108 possibilities)
4109 #'<)
4114 kept-old-versions
4115 kept-new-versions
4122 ;; Delete nothing if there is overflow
4123 ;; in the number of versions to keep.
4129 v))))))))))
4132 "Return number of names file FILENAME has."
4135 ;; (defun file-relative-name (filename &optional directory)
4136 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4137 ;; This function returns a relative file name which is equivalent to FILENAME
4138 ;; when used with that default directory as the default.
4139 ;; If this is impossible (which can happen on MSDOS and Windows
4140 ;; when the file name and directory use different drive names)
4141 ;; then it returns FILENAME."
4142 ;; (save-match-data
4143 ;; (let ((fname (expand-file-name filename)))
4144 ;; (setq directory (file-name-as-directory
4145 ;; (expand-file-name (or directory default-directory))))
4146 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
4147 ;; ;; drive names, they can't be relative, so return the absolute name.
4148 ;; (if (and (or (eq system-type 'ms-dos)
4149 ;; (eq system-type 'cygwin)
4150 ;; (eq system-type 'windows-nt))
4151 ;; (not (string-equal (substring fname 0 2)
4152 ;; (substring directory 0 2))))
4153 ;; filename
4154 ;; (let ((ancestor ".")
4155 ;; (fname-dir (file-name-as-directory fname)))
4156 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
4157 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
4158 ;; (setq directory (file-name-directory (substring directory 0 -1))
4159 ;; ancestor (if (equal ancestor ".")
4160 ;; ".."
4161 ;; (concat "../" ancestor))))
4162 ;; ;; Now ancestor is empty, or .., or ../.., etc.
4163 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
4164 ;; ;; We matched within FNAME's directory part.
4165 ;; ;; Add the rest of FNAME onto ANCESTOR.
4166 ;; (let ((rest (substring fname (match-end 0))))
4167 ;; (if (and (equal ancestor ".")
4168 ;; (not (equal rest "")))
4169 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
4170 ;; rest
4171 ;; (concat (file-name-as-directory ancestor) rest)))
4172 ;; ;; We matched FNAME's directory equivalent.
4173 ;; ancestor))))))
4176 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4177 This function returns a relative file name which is equivalent to FILENAME
4178 when used with that default directory as the default.
4179 If FILENAME and DIRECTORY lie on different machines or on different drives
4180 on a DOS/Windows machine, it returns FILENAME in expanded form."
4184 default-directory))))
4190 ;; Test for different filesystems on DOS/Windows
4192 ;; Should `cygwin' really be included here? --stef
4195 ;; Test for different drive letters
4197 ;; Test for UNCs on different servers
4202 ;; Windows file names cannot have ? in
4203 ;; them, so use that to detect when
4204 ;; neither FILENAME nor DIRECTORY is a
4205 ;; UNC.
4207 0 nil
4213 ;; Test for different remote file system identification
4215 filename
4221 directory nil nil case-fold-search))
4223 directory nil nil case-fold-search))))
4226 ".."
4228 ;; Now ancestor is empty, or .., or ../.., etc.
4230 directory nil nil case-fold-search))
4231 ;; We matched within FILENAME's directory part.
4232 ;; Add the rest of FILENAME onto ANCESTOR.
4235 ;; But don't bother with ANCESTOR if it would give us `./'.
4236 rest
4238 ;; We matched FILENAME's directory equivalent.
4239 ancestor))))))
4240 \f
4242 "Save current buffer in visited file if modified.
4243 Variations are described below.
4245 By default, makes the previous version into a backup file
4246 if previously requested or if this is the first save.
4248 to become a backup when the next save is done.
4250 unconditionally makes the previous version into a backup file.
4252 to become a backup when the next save is done,
4253 and unconditionally makes the previous version into a backup file.
4255 With a numeric argument of 0, never make the previous version
4256 into a backup file.
4258 If a file's name is FOO, the names of its numbered backup versions are
4259 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
4260 Numeric backups (rather than FOO~) will be made if value of
4261 `version-control' is not the atom `never' and either there are already
4262 numeric versions of the file being backed up, or `version-control' is
4263 non-nil.
4264 We don't want excessive versions piling up, so there are variables
4265 `kept-old-versions', which tells Emacs how many oldest versions to keep,
4266 and `kept-new-versions', which tells how many newest versions to keep.
4267 Defaults are 2 old versions and 2 new.
4268 `dired-kept-versions' controls dired's clean-directory (.) command.
4269 If `delete-old-versions' is nil, system will query user
4270 before trimming versions. Otherwise it does it silently.
4272 If `vc-make-backup-files' is nil, which is the default,
4273 no backup files are made for files managed by version control.
4274 (This is because the version control system itself records previous versions.)
4276 See the subroutine `basic-save-buffer' for more information."
4282 ;; We used to display the message below only for files > 50KB, but
4283 ;; then Rmail-mbox never displays it due to buffer swapping. If
4284 ;; the test is ever re-introduced, be sure to handle saving of
4285 ;; Rmail files.
4292 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
4293 Normally delete only if the file was written by this Emacs since
4294 the last real save, but optional arg FORCE non-nil means delete anyway."
4308 "Normal hook that is run before a buffer is saved to its file."
4314 "Normal hook that is run after a buffer is saved to its file."
4320 "If non-nil, use this coding system for saving the buffer.
4321 More precisely, use this coding system in place of the
4322 value of `buffer-file-coding-system', when saving the buffer.
4323 Calling `write-region' for any purpose other than saving the buffer
4324 will still use `buffer-file-coding-system'; this variable has no effect
4331 "Save the current buffer in its visited file, if it has been modified.
4332 The hooks `write-contents-functions' and `write-file-functions' get a chance
4333 to do the job of saving; if they do not, then the buffer is saved in
4334 the visited file in the usual way.
4335 Before and after saving the buffer, this function runs
4336 `before-save-hook' and `after-save-hook', respectively."
4339 ;; In an indirect buffer, save its base buffer instead.
4343 ;; handle the case when no modification has been made but
4344 ;; the file disappeared since visited
4348 setmodes)
4349 ;; If buffer has no file name, ask user for one.
4356 ;; Signal an error if the user specified the name of an
4357 ;; existing directory.
4360 filename))
4362 ;; Signal an error if the specified name refers to a
4363 ;; non-existing directory.
4374 "%s has changed since visited or saved. Save anyway? "
4394 ;; Support VC version backups.
4400 ;; If a hook returned t, file is already "written".
4401 ;; Otherwise, write it the usual way now.
4403 ;; Now we have saved the current buffer. Let's make sure
4404 ;; that buffer-file-coding-system is fixed to what
4405 ;; actually used for saving by binding it locally.
4417 ;; If the auto-save file was recent before this command,
4418 ;; delete it now.
4420 ;; Support VC `implicit' locking.
4425 ;; This does the "real job" of writing a buffer into its visited file
4426 ;; and making a backup file. This is what is normally done
4427 ;; but inhibited if one of write-file-functions returns non-nil.
4428 ;; It returns a value (MODES SELINUXCONTEXT BACKUPNAME), like backup-buffer.
4440 ;; This returns a value (MODES SELINUXCONTEXT BACKUPNAME), like backup-buffer.
4453 "File %s is write-protected; try to save anyway? "
4455 buffer-file-name)))
4470 ;; Write temp name, then rename it.
4471 ;; This requires write access to the containing dir,
4472 ;; which is why we don't try it if we don't have that access.
4474 tempname succeed
4477 ;; Create temp files with strict access rights. It's easy to
4478 ;; loosen them later, whereas it's impossible to close the
4479 ;; time-window of loose permissions otherwise.
4484 ;; Try various temporary names.
4485 ;; This code follows the example of make-temp-file,
4486 ;; but it calls write-region in the appropriate way
4487 ;; for saving the buffer.
4493 ;; Pass in nil&nil rather than point-min&max
4494 ;; cause we're saving the whole buffer.
4495 ;; write-region-annotate-functions may use it.
4497 tempname nil realname
4499 nil)
4501 ;; The file was somehow created by someone else between
4502 ;; `make-temp-name' and `write-region', let's try again.
4503 nil)
4505 ;; Reset the umask.
4507 ;; If we failed, restore the buffer's modtime.
4510 ;; Since we have created an entirely new file,
4511 ;; make sure it gets the right permission bits set.
4516 buffer-file-name)))
4517 ;; We succeeded in writing the temp file,
4518 ;; so rename it.
4520 ;; If file not writable, see if we can make it writable
4521 ;; temporarily while we write it.
4522 ;; But no need to do so if we have just backed it up
4523 ;; (setmodes is set) because that says we're superseding.
4525 ;; Change the mode back, after writing.
4528 buffer-file-name))
4534 ;; Pass in nil&nil rather than point-min&max to indicate
4535 ;; we're saving the buffer rather than just a region.
4536 ;; write-region-annotate-functions may make us of it.
4538 buffer-file-name nil t buffer-file-truename)
4540 ;; If we get an error writing the new file, and we made
4541 ;; the backup by renaming, undo the backing-up.
4546 setmodes))
4552 `((?\C-r
4559 ;; Return nil to ask about BUF again.
4560 nil)
4573 ;; Return nil to ask about BUF again.
4574 nil)
4584 "Save some modified file-visiting buffers. Asks user about each one.
4585 You can answer `y' to save, `n' not to save, `C-r' to look at the
4586 buffer in question with `view-buffer' before deciding or `d' to
4587 view the differences using `diff-buffer-with-file'.
4589 This command first saves any buffers where `buffer-save-without-query' is
4590 non-nil, without asking.
4592 Optional argument (the prefix) non-nil means save all with no questions.
4593 Optional second argument PRED determines which buffers are considered:
4594 If PRED is nil, all the file-visiting buffers are considered.
4595 If PRED is t, then certain non-file buffers will also be considered.
4596 If PRED is a zero-argument function, it indicates for each buffer whether
4597 to consider it or not when called with that buffer current.
4599 See `save-some-buffers-action-alist' if you want to
4600 change the additional actions you can take on files."
4604 files-done abbrevs-done)
4606 ;; First save any buffers that we're supposed to save unconditionally.
4607 ;; That way the following code won't ask about them.
4612 ;; Ask about those buffers that merit it,
4613 ;; and record the number thus saved.
4617 ;; Note that killing some buffers may kill others via
4618 ;; hooks (e.g. Rmail and its viewing buffer).
4631 t
4643 save-some-buffers-action-alist))
4644 ;; Maybe to save abbrevs, and record whether
4645 ;; we either saved them or asked to.
4652 ;; Don't keep bothering user if he says no.
4665 \f
4667 "Mark current buffer as unmodified, not needing to be saved.
4670 It is not a good idea to use this function in Lisp programs, because it
4671 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
4678 "Change whether this buffer is read-only.
4679 With prefix argument ARG, make the buffer read-only if ARG is
4680 positive, otherwise make it writable. If buffer is read-only
4681 and `view-read-only' is non-nil, enter view mode."
4686 nil ; do nothing.
4687 ;; Toggle.
4694 ;; If view-mode is already active, `view-mode-enter' is a nop.
4706 "Insert contents of file FILENAME into buffer after point.
4707 Set mark after the inserted text.
4709 This function is meant for the user to run interactively.
4710 Don't call it from programs! Use `insert-file-contents' instead.
4711 \(Its calling sequence is different; see its documentation)."
4716 "Append the contents of the region to the end of file FILENAME.
4717 When called from a function, expects three arguments,
4718 START, END and FILENAME. START and END are normally buffer positions
4719 specifying the part of the buffer to write.
4720 If START is nil, that means to use the entire buffer contents.
4721 If START is a string, then output that string to the file
4722 instead of any buffer contents; END is ignored.
4724 This does character code conversion and applies annotations
4725 like `write-region' does."
4730 "Return most recent backup file for FILENAME or nil if no backups exist."
4731 ;; `make-backup-file-name' will get us the right directory for
4732 ;; ordinary or numeric backups. It might create a directory for
4733 ;; backups as a side-effect, according to `backup-directory-alist'.
4740 tem)
4749 newest))
4752 "Rename current buffer to a similar name not already taken.
4753 This function is useful for creating multiple shell process buffers
4754 or multiple mail buffers, etc."
4762 ;; If the existing buffer name has a <NNN>,
4763 ;; which isn't part of the file name (if any),
4764 ;; then get rid of that.
4770 "Create the directory DIR and optionally any nonexistent parent dirs.
4771 If DIR already exists as a directory, signal an error, unless
4772 PARENTS is non-nil.
4774 Interactively, the default choice of directory to create is the
4775 current buffer's default directory. That is useful when you have
4776 visited a file in a nonexistent directory.
4778 Noninteractively, the second (optional) argument PARENTS, if
4779 non-nil, says whether to create parent directories that don't
4780 exist. Interactively, this happens by default."
4783 nil nil)
4784 t))
4785 ;; If default-directory is a remote directory,
4786 ;; make sure we find its make-directory handler.
4794 create-list)
4796 ;; If directory is its own parent, then we can't
4797 ;; keep looping forever
4812 "Delete the directory named DIRECTORY. Does not follow symlinks.
4813 If RECURSIVE is non-nil, all files in DIRECTORY are deleted as well.
4814 TRASH non-nil means to trash the directory instead, provided
4815 `delete-by-moving-to-trash' is non-nil.
4817 When called interactively, TRASH is t if no prefix argument is
4818 given. With a prefix argument, TRASH is nil."
4825 "Move directory to trash: "
4827 default-directory default-directory nil nil))))
4833 nil)
4835 ;; If default-directory is a remote directory, make sure we find its
4836 ;; delete-directory handler.
4843 ;; Only move non-empty dir to trash if recursive deletion was
4844 ;; requested. This mimics the non-`delete-by-moving-to-trash'
4845 ;; case, where the operation fails in delete-directory-internal.
4846 ;; As `move-file-to-trash' trashes directories (empty or
4847 ;; otherwise) as a unit, we do not need to recurse here.
4849 ;; Check if directory is empty apart from "." and "..".
4854 ;; Otherwise, call outselves recursively if needed.
4858 ;; This test is equivalent to
4859 ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
4860 ;; but more efficient
4864 ;; We do not want to delete "." and "..".
4870 "Copy DIRECTORY to NEWNAME. Both args must be strings.
4871 This function always sets the file modes of the output files to match
4872 the corresponding input file.
4874 The third arg KEEP-TIME non-nil means give the output files the same
4875 last-modified time as the old ones. (This works on only some systems.)
4877 A prefix arg makes KEEP-TIME non-nil.
4879 Noninteractively, the last argument PARENTS says whether to
4880 create parent directories if they don't exist. Interactively,
4881 this happens by default.
4883 If NEWNAME names an existing directory, copy DIRECTORY as a
4884 subdirectory there. However, if called from Lisp with a non-nil
4885 optional argument COPY-CONTENTS, copy the contents of DIRECTORY
4886 directly into NEWNAME instead."
4893 default-directory default-directory nil nil)
4894 current-prefix-arg t nil)))
4895 ;; If default-directory is a remote directory, make sure we find its
4896 ;; copy-directory handler.
4902 ;; Compute target name.
4907 ;; If NEWNAME is not an existing directory, create it;
4908 ;; that is where we will copy the files of DIRECTORY.
4910 ;; If NEWNAME is an existing directory and COPY-CONTENTS
4911 ;; is nil, copy into NEWNAME/[DIRECTORY-BASENAME].
4916 newname))
4920 newname))
4923 ;; Copy recursively.
4925 ;; We do not want to copy "." and "..".
4927 directory-files-no-dot-files-regexp))
4936 ;; Set directory attributes.
4940 \f
4943 "Function to use to revert this buffer, or nil to do the default.
4944 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
4949 "Function to use to insert contents when reverting this buffer.
4950 Gets two args, first the nominal file name to use,
4951 and second, t if reading the auto-save file.
4956 "Function to check whether a non-file buffer needs reverting.
4957 This should be a function with one optional argument NOCONFIRM.
4958 Auto Revert Mode passes t for NOCONFIRM. The function should return
4959 non-nil if the buffer should be reverted. A return value of
4960 `fast' means that the need for reverting was not checked, but
4961 that reverting the buffer is fast. The buffer is current when
4962 this function is called.
4964 The idea behind the NOCONFIRM argument is that it should be
4965 non-nil if the buffer is going to be reverted without asking the
4966 user. In such situations, one has to be careful with potentially
4967 time consuming operations.
4969 For more information on how this variable is used by Auto Revert mode,
4973 "Normal hook for `revert-buffer' to run before reverting.
4974 If `revert-buffer-function' is used to override the normal revert
4978 "Normal hook for `revert-buffer' to run after reverting.
4979 Note that the hook value that it runs is the value that was in effect
4980 before reverting; that makes a difference if you have buffer-local
4981 hook functions.
4983 If `revert-buffer-function' is used to override the normal revert
4987 "Non-nil if a `revert-buffer' operation is in progress, nil otherwise.
4993 "Replace current buffer text with the text of the visited file on disk.
4994 This undoes all changes since the file was visited or saved.
4995 With a prefix argument, offer to revert from latest auto-save file, if
4996 that is more recent than the visited file.
4998 This command also implements an interface for special buffers
4999 that contain text which doesn't come from a file, but reflects
5000 some other data instead (e.g. Dired buffers, `buffer-list'
5001 buffers). This is done via the variable `revert-buffer-function'.
5002 In these cases, it should reconstruct the buffer contents from the
5003 appropriate data.
5005 When called from Lisp, the first argument is IGNORE-AUTO; only offer
5006 to revert from the auto-save file when this is nil. Note that the
5007 sense of this argument is the reverse of the prefix argument, for the
5008 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
5009 to nil.
5011 Optional second argument NOCONFIRM means don't ask for confirmation
5012 at all. (The variable `revert-without-query' offers another way to
5013 revert buffers without querying for confirmation.)
5015 Optional third argument PRESERVE-MODES non-nil means don't alter
5016 the files modes. Normally we reinitialize them using `normal-mode'.
5018 If the value of `revert-buffer-function' is non-nil, it is called to
5019 do all the work for this command. Otherwise, the hooks
5020 `before-revert-hook' and `after-revert-hook' are run at the beginning
5021 and the end, and if `revert-buffer-insert-file-contents-function' is
5022 non-nil, it is called instead of rereading visited file contents."
5024 ;; I admit it's odd to reverse the sense of the prefix argument, but
5025 ;; there is a lot of code out there which assumes that the first
5026 ;; argument should be t to avoid consulting the auto-save file, and
5027 ;; there's no straightforward way to encourage authors to notice a
5028 ;; reversal of the argument sense. So I'm just changing the user
5029 ;; interface, but leaving the programmatic interface the same.
5039 buffer-auto-save-file-name
5044 buffer-auto-save-file-name
5045 buffer-file-name)))
5055 file-name)))
5057 ;; If file was backed up but has changed since,
5058 ;; we should make another backup.
5062 ;; Effectively copy the after-revert-hook status,
5063 ;; since after-find-file will clobber it.
5066 after-revert-hook))
5071 ;; Get rid of all undo records for this buffer.
5073 ;; Don't make undo records for the reversion.
5076 file-name auto-save-p)))
5079 "File %s no longer exists!"
5081 file-name))
5084 "File %s no longer readable!"
5086 file-name))
5088 ;; Bind buffer-file-name to nil
5089 ;; so that we don't try to lock the file.
5095 ;; Auto-saved file should be read by Emacs'
5096 ;; internal coding.
5100 buffer-file-coding-system-explicit
5103 coding-system-for-read
5105 coding-system-for-read)
5107 ;; As a coding system suitable for multibyte
5108 ;; buffer is specified, make the current
5109 ;; buffer multibyte.
5112 ;; This force after-insert-file-set-coding
5113 ;; (called from insert-file-contents) to set
5114 ;; buffer-file-coding-system to a proper value.
5117 ;; Note that this preserves point in an intelligent way.
5121 nil nil t))
5123 nil nil t)))))
5124 ;; Recompute the truename in case changes in symlinks
5125 ;; have changed the truename.
5129 ;; Run after-revert-hook as it was before we reverted.
5133 local-hook)
5136 t))))))
5139 "Recover the visited file--get contents from its last auto-save file."
5144 "Visit file FILE, but get contents from its last auto-save file."
5145 ;; Actually putting the file name in the minibuffer should be used
5146 ;; only rarely.
5147 ;; Not just because users often use the default.
5167 ;; Use insert-directory-safely, not insert-directory,
5168 ;; because these files might not exist. In particular,
5169 ;; FILE might not exist if the auto-save file was for
5170 ;; a buffer that didn't visit a file, such as "*mail*".
5171 ;; The code in v20.x called `ls' directly, so we need
5172 ;; to emulate what `ls' did in that case.
5178 ;; Keep the current buffer-file-coding-system.
5180 ;; Auto-saved file should be read with special coding.
5189 "Recover auto save files from a previous Emacs session.
5190 This command first displays a Dired buffer showing you the
5191 previous sessions that you could recover from.
5192 To choose one, move point to the proper line and then type C-c C-c.
5193 Then you'll be asked about a number of files to recover."
5203 auto-save-list-file-prefix)))
5204 t)
5213 ;; Each line starts with a space
5214 ;; so that Font Lock mode won't highlight the first character.
5223 "Choose one saved session to recover auto-save files from.
5224 This command is used in the special Dired buffer created by
5227 ;; Get the name of the session file to recover from.
5229 files
5235 ;; Read in the auto-save-list file.
5238 ;; Loop thru the text of that file
5239 ;; and get out the names of the files to recover.
5243 ;; This is a pair of lines for a non-file-visiting buffer.
5244 ;; Get the auto-save file name and manufacture
5245 ;; a "visited file name" from that.
5248 ;; If there is no auto-save file name, the
5249 ;; auto-save-list file is probably corrupted.
5262 ;; This pair of lines is a file-visiting
5263 ;; buffer. Use the visited file name.
5273 ;; Ignore a file if its auto-save file does not exist now.
5277 ;; The file contains a pair of line for each auto-saved buffer.
5278 ;; The first line of the pair contains the visited file name
5279 ;; or is empty if the buffer was not visiting a file.
5280 ;; The second line is the auto-save file name.
5288 files
5294 "Kill BUFFER if confirmed."
5302 "Kill some buffers. Asks the user whether to kill each one of them.
5303 Non-interactively, if optional argument LIST is non-nil, it
5304 specifies the list of buffers to kill, asking for approval for each one."
5312 ; if we killed the base buffer.
5319 "Kill buffers whose name matches the specified REGEXP.
5320 The optional second argument indicates whether to kill internal buffers too."
5329 \f
5331 "Adjust current buffer's auto save file name for current conditions.
5332 Also rename any existing auto save file, if it was made in this session."
5344 "Return file name to use for auto-saves of current buffer.
5345 Does not consider `auto-save-visited-file-name' as that variable is checked
5346 before calling this function. You can redefine this for customization.
5347 See also `auto-save-file-name-p'."
5355 result uniq)
5356 ;; Apply user-specified translations
5357 ;; to the file name.
5361 filename)
5371 filename))))
5376 ;; We truncate the file name to DOS 8+3 limits
5377 ;; before doing anything else, because the regexp
5378 ;; passed to string-match below cannot handle
5379 ;; extensions longer than 3 characters, multiple
5380 ;; dots, and other atrocities.
5385 fn)
5390 "#"
5393 ;; Make sure auto-save file names don't contain characters
5394 ;; invalid for the underlying filesystem.
5396 ;; Don't modify remote (ange-ftp) filenames
5399 result))))
5401 ;; Deal with buffers that don't have any associated files. (Mail
5402 ;; mode tends to create a good number of these.)
5406 file-name)
5407 ;; Restrict the characters used in the file name to those which
5408 ;; are known to be safe on all filesystems, url-encoding the
5409 ;; rest.
5410 ;; We do this on all platforms, because even if we are not
5411 ;; running on DOS/Windows, the current directory may be on a
5412 ;; mounted VFAT filesystem, such as a USB memory stick.
5416 ;; For multibyte characters, this will produce more than
5417 ;; 2 hex digits, so is not true URL encoding.
5421 ;; Generate the file name.
5427 ;; Try a few alternative directories, to get one we can
5428 ;; write it.
5434 ;; Don't modify remote (ange-ftp) filenames
5436 ;; The call to convert-standard-filename is in case
5437 ;; buffer-name includes characters not allowed by the
5438 ;; DOS/Windows filesystems. make-temp-file writes to the
5439 ;; file it creates, so we must fix the file name _before_
5440 ;; make-temp-file is called.
5442 fname))
5444 ;; make-temp-file creates the file,
5445 ;; but we don't want it to exist until we do an auto-save.
5449 file-name)))
5452 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
5453 FILENAME should lack slashes. You can redefine this for customization."
5455 \f
5457 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
5458 The generated regexp will match a filename only if the filename
5459 matches that wildcard according to shell rules. Only wildcards known
5460 by `sh' are supported."
5462 ;; Copy the initial run of non-special characters.
5465 ;; If no special characters, we're almost done.
5469 j)
5471 result
5492 ;; Found "[^". Insert a `\0' character
5493 ;; (which cannot happen in a filename)
5494 ;; into the character class, so that `^'
5495 ;; is not the first character after `[',
5496 ;; and thus non-special in a regexp.
5501 ;; I don't think `]' can appear in a
5502 ;; character class in a wildcard, but
5503 ;; let's be general here.
5510 i
5523 ;; Shell wildcards should match the entire filename,
5524 ;; not its part. Make the regexp say so.
5526 \f
5529 "Switches for `list-directory' to pass to `ls' for brief listing."
5535 "Switches for `list-directory' to pass to `ls' for verbose listing."
5540 "Expand wildcard pattern PATTERN.
5541 This returns a list of file names which match the pattern.
5543 If PATTERN is written as an absolute file name,
5544 the values are absolute also.
5546 If PATTERN is written as a relative file name, it is interpreted
5547 relative to the current default directory, `default-directory'.
5548 The file names returned are normally also relative to the current
5549 default directory. However, if FULL is non-nil, they are absolute."
5553 ;; A list of all dirs that DIRPART specifies.
5554 ;; This can be more than one dir
5555 ;; if DIRPART contains wildcards.
5559 dirpart)))
5563 contents)
5568 ;; Filter out "." and ".."
5573 name))
5580 this-dir-contents)
5581 this-dir-contents)
5582 contents))))
5584 contents)))
5586 ;; Let Tramp know that `file-expand-wildcards' does not need an advice.
5590 "Display a list of files in or matching DIRNAME, a la `ls'.
5591 DIRNAME is globbed by the shell if necessary.
5592 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
5593 Actions controlled by variables `list-directory-brief-switches'
5594 and `list-directory-verbose-switches'."
5598 nil default-directory nil)
5599 pfx)))
5601 list-directory-brief-switches))
5602 buffer)
5614 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
5622 "Quote characters special to the shell in PATTERN, leave wildcards alone.
5624 PATTERN is assumed to represent a file-name wildcard suitable for the
5625 underlying filesystem. For Unix and GNU/Linux, each character from the
5627 the parts of the pattern which don't include wildcard characters are
5628 quoted with double quotes.
5631 on Windows), so PATTERN can use them to quote wildcard characters that
5632 need to be passed verbatim to shell commands."
5636 ;; DOS/Windows don't allow `"' in file names. So if the
5637 ;; argument has quotes, we can safely assume it is already
5638 ;; quoted by the caller.
5640 ;; We quote [&()#$'] in case their shell is a port of a
5641 ;; Unixy shell. We quote [,=+] because stock DOS and
5642 ;; Windows shells require that in some cases, such as
5643 ;; passing arguments to batch files that use positional
5644 ;; arguments like %1.
5646 pattern
5649 end)
5666 pattern))))
5673 "Program to get the amount of free space on a file system.
5674 We assume the output has the format of `df'.
5675 The value of this variable must be just a command name or file name;
5676 if you want to specify options, use `directory-free-space-args'.
5678 A value of nil disables this feature.
5680 If the function `file-system-info' is defined, it is always used in
5681 preference to the program given by this variable."
5687 "Options to use when running `directory-free-space-program'."
5692 "Return the amount of free space on directory DIR's file system.
5693 The return value is a string describing the amount of free
5694 space (normally, the number of free 1KB blocks).
5696 This function calls `file-system-info' if it is available, or
5697 invokes the program specified by `directory-free-space-program'
5698 and `directory-free-space-args'. If the system call or program
5699 is unsuccessful, or if DIR is a remote directory, this function
5700 returns nil."
5702 ;; Try to find the number of free blocks. Non-Posix systems don't
5703 ;; always have df, but might have an equivalent system call.
5712 ;; Avoid failure if the default directory does
5713 ;; not exist (Bug#2631, Bug#3911).
5716 nil t nil
5717 directory-free-space-args
5718 dir)
5720 ;; Assume that the "available" column is before the
5721 ;; "capacity" column. Find the "%" and scan backward.
5725 "[[:space:]]+[^[:space:]]+%[^%]*$"
5732 ;; The following expression replaces `dired-move-to-filename-regexp'.
5736 ;; In some locales, month abbreviations are as short as 2 letters,
5737 ;; and they can be followed by ".".
5738 ;; In Breton, a month name can include a quote character.
5751 s "+"
5754 ;; Japanese MS-Windows ls-lisp has one-digit months, and
5755 ;; omits the Kanji characters after month and day-of-month.
5756 ;; On Mac OS X 10.3, the date format in East Asian locales is
5757 ;; day-of-month digits followed by month digits.
5763 ;; The "[0-9]" below requires the previous column to end in a digit.
5764 ;; This avoids recognizing `1 may 1997' as a date in the line:
5765 ;; -r--r--r-- 1 may 1997 1168 Oct 19 16:49 README
5767 ;; The "[BkKMGTPEZY]?" below supports "ls -alh" output.
5769 ;; For non-iso date formats, we add the ".*" in order to find
5770 ;; the last possible match. This avoids recognizing
5771 ;; `jservice 10 1024' as a date in the line:
5772 ;; drwxr-xr-x 3 jservice 10 1024 Jul 2 1997 esg-host
5774 ;; vc dired listings provide the state or blanks between file
5775 ;; permissions and date. The state is always surrounded by
5776 ;; parantheses:
5777 ;; -rw-r--r-- (modified) 2005-10-22 21:25 files.el
5778 ;; This is not supported yet.
5783 "Regular expression to match up to the file name in a directory listing.
5784 The default value is designed to recognize dates and times
5789 ;; insert-directory
5790 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
5791 ;; FULL-DIRECTORY-P is nil.
5792 ;; The single line of output must display FILE's name as it was
5793 ;; given, namely, an absolute path name.
5794 ;; - must insert exactly one line for each file if WILDCARD or
5795 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
5796 ;; before the file lines, plus optional text after the file lines.
5797 ;; Lines are delimited by "\n", so filenames containing "\n" are not
5798 ;; allowed.
5799 ;; File lines should display the basename.
5800 ;; - must be consistent with
5801 ;; - functions dired-move-to-filename, (these two define what a file line is)
5802 ;; dired-move-to-end-of-filename,
5803 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
5804 ;; dired-insert-headerline
5805 ;; dired-after-subdir-garbage (defines what a "total" line is)
5806 ;; - variable dired-subdir-regexp
5807 ;; - may be passed "--dired" as the first argument in SWITCHES.
5808 ;; Filename handlers might have to remove this switch if their
5809 ;; "ls" command does not support it.
5811 "Insert directory listing for FILE, formatted according to SWITCHES.
5812 Leaves point after the inserted text.
5813 SWITCHES may be a string of options, or a list of strings
5814 representing individual options.
5815 Optional third arg WILDCARD means treat FILE as shell wildcard.
5816 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
5817 switches do not contain `d', so that a full listing is expected.
5819 This works by running a directory listing program
5820 whose name is in the variable `insert-directory-program'.
5821 If WILDCARD, it also runs the shell specified by `shell-file-name'.
5823 When SWITCHES contains the long `--dired' option, this function
5824 treats it specially, for the sake of dired. However, the
5825 normally equivalent short `-D' option is just passed on to
5826 `insert-directory-program', as any other option."
5827 ;; We need the directory in order to find the right handler.
5832 wildcard full-directory-p)
5835 ;; Read the actual directory using `insert-directory-program'.
5836 ;; RESULT gets the status code.
5838 ;; putting text property `dired-filename, decode one
5839 ;; bunch by one to preserve that property.
5841 ;; This is to control encoding the arguments in call-process.
5845 default-file-name-coding-system))))
5848 ;; Run ls in the directory part of the file pattern
5849 ;; using the last component as argument.
5855 ;; NB since switches is passed to the shell, be
5856 ;; careful of malicious values, eg "-l;reboot".
5857 ;; See eg dired-safe-switches-p.
5859 shell-file-name nil t nil
5860 "-c"
5862 ""
5864 insert-directory-program
5865 " -d "
5867 switches
5869 " -- "
5870 ;; Quote some characters that have
5871 ;; special meanings in shells; but
5872 ;; don't quote the wildcards--we want
5873 ;; them to be special. We also
5874 ;; currently don't quote the quoting
5875 ;; characters in case people want to
5876 ;; use them explicitly to quote
5877 ;; wildcard characters.
5879 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
5880 ;; directory if FILE is a symbolic link.
5887 insert-directory-program nil t nil
5891 ;; Split the switches at any spaces so we can
5892 ;; pass separate options as separate args.
5894 ;; Avoid lossage if FILE starts with `-'.
5902 file))))))))
5904 ;; If we got "//DIRED//" in the output, it means we got a real
5905 ;; directory listing, even if `ls' returned nonzero.
5906 ;; So ignore any errors.
5919 ;; The first time ls returns an error,
5920 ;; find the version numbers of ls,
5921 ;; and set insert-directory-ls-version
5922 ;; to > if it is more than 5.2.1, < if it is less, nil if it
5923 ;; is equal or if the info cannot be obtained.
5924 ;; (That can mean it isn't GNU ls.)
5934 comparison)
5950 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
5954 ;; If `insert-directory-program' failed, signal an error.
5956 ;; Delete the error message it may have output.
5958 ;; On non-Posix systems, we cannot open a directory, so
5959 ;; don't even try, because that will always result in
5960 ;; the ubiquitous "Access denied". Instead, show the
5961 ;; command line so the user can try to guess what went wrong.
5966 insert-directory-program
5968 file result)
5969 ;; Unix. Access the file to get a suitable error.
5976 ;; The following overshoots by one line for an empty
5977 ;; directory listed with "--dired", but without "-a"
5978 ;; switch, where the ls output contains a
5979 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
5980 ;; We take care of that case later.
5988 error-lines)
5989 ;; Find all the lines that are error messages,
5990 ;; and record the bounds of each one.
5997 ;; Now read the numeric positions of file names.
6004 error-lines))
6007 error-lines)))
6009 ;; End is followed by \n or by " -> ".
6011 ;; It seems that we can't trust ls's output as to
6012 ;; byte positions of filenames.
6018 ;; Take care of the case where the ls output contains a
6019 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
6020 ;; and we went one line too far back (see above).
6025 ;; Now decode what read if necessary.
6027 file-name-coding-system
6028 default-file-name-coding-system
6030 coding-no-eol
6031 val pos)
6035 ;; If no coding system is specified or detection is
6036 ;; requested, detect the coding.
6050 ;; Force no eol conversion on a file name, so
6051 ;; that CR is preserved.
6059 ;; Try to insert the amount of free space.
6062 ;; First find the line to put it on.
6066 ;; Replace "total" with "used", to avoid confusion.
6072 "Convert `ls --dired' file name position value POS to a buffer position.
6073 File name position values returned in ls --dired output
6074 count only stdout; they don't count the error messages sent to stderr.
6075 So this function converts to them to real buffer positions.
6076 ERROR-LINES is a list of buffer positions of error message lines,
6077 of the form (START END)."
6081 pos)
6085 "Insert directory listing for FILE, formatted according to SWITCHES.
6087 Like `insert-directory', but if FILE does not exist, it inserts a
6088 message to that effect instead of signaling an error."
6091 ;; Simulate the message printed by `ls'.
6095 "Functions to call with no arguments to query about killing Emacs.
6096 If any of these functions returns nil, killing Emacs is cancelled.
6097 `save-buffers-kill-emacs' calls these functions, but `kill-emacs',
6101 "How to ask for confirmation when leaving Emacs.
6102 If nil, the default, don't ask at all. If the value is non-nil, it should
6103 be a predicate function such as `yes-or-no-p'."
6111 "Offer to save each buffer, then kill this Emacs process.
6112 With prefix ARG, silently save all file-visiting buffers, then kill."
6121 ;; process-list is not defined on MSDOS.
6123 active)
6132 ;; Query the user for other things, perhaps.
6139 "Offer to save each buffer, then kill the current connection.
6140 If the current frame has no client, kill Emacs itself.
6142 With prefix ARG, silently save all file-visiting buffers, then kill.
6144 If emacsclient was started with a list of filenames to edit, then
6145 only these files will be asked to be saved."
6150 \f
6151 ;; We use /: as a prefix to "quote" a file name
6152 ;; so that magic file name handlers will not apply to it.
6156 file-name-handler-alist))
6158 ;; We depend on being the last handler on the list,
6159 ;; so that anything else which does need handling
6160 ;; has been handled already.
6161 ;; So it is safe for us to inhibit *all* magic file name handlers.
6170 default-directory))
6171 ;; Get a list of the indices of the args which are file names.
6174 ;; The first six are special because they
6175 ;; return a file name. We want to include the /:
6176 ;; in the return value.
6177 ;; So just avoid stripping it in the first place.
6184 ;; `identity' means just return the first arg
6185 ;; not stripped of its quoting.
6187 ;; `add' means add "/:" to the result.
6190 ;; `unquote-then-quote' means set buffer-file-name
6191 ;; temporarily to unquoted filename.
6193 ;; List the arguments which are filenames.
6201 ;; For all other operations, treat the first argument only
6202 ;; as the file name.
6204 method
6205 ;; Copy ARGUMENTS so we can replace elements in it.
6209 ;; Strip off the /: from the file names that have it.
6217 "/"
6234 \f
6235 ;; Symbolic modes and read-file-modes.
6238 "Convert CHAR to a numeric bit-mask for extracting mode bits.
6239 CHAR is in [ugoa] and represents the category of users (Owner, Group,
6240 Others, or All) for whom to produce the mask.
6241 The bit-mask that is returned extracts from mode bits the access rights
6242 for the specified category of users."
6250 "Convert CHAR to a numeric value of mode bits.
6251 CHAR is in [rwxXstugo] and represents symbolic access permissions.
6252 If CHAR is in [Xugo], the value is taken from FROM (or 0 if omitted)."
6259 ;; Rights relative to the previous file modes.
6270 "Convert a symbolic mode string specification to an equivalent number.
6272 WHO-MASK is the bit-mask specifying the category of users to which to
6273 apply the access permissions. See `file-modes-char-to-who'.
6274 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6275 RIGHTS request to add, remove, or set permissions based on existing ones,
6282 char-right)
6289 num-rights
6293 op char-right)))
6294 num-rights))
6297 "Convert symbolic file modes to numeric file modes.
6298 MODES is the string to convert, it should match
6301 notation.
6302 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6303 MODES request to add, remove, or set permissions based on existing ones,
6317 num-who num-modes)
6320 num-modes)))
6323 "Read file modes in octal or symbolic notation and return its numeric value.
6324 PROMPT is used as the prompt, default to `File modes (octal or symbolic): '.
6325 ORIG-FILE is the name of a file on whose mode bits to base returned
6326 permissions if what user types requests to add, remove, or set permissions
6342 nil nil default)))
6348 \f
6349 ;; Trashcan handling.
6351 "Directory for `move-file-to-trash' to move files and directories to.
6352 This directory is only used when the function `system-move-file-to-trash'
6353 is not defined.
6354 Relative paths are interpreted relative to `default-directory'.
6355 If the value is nil, Emacs uses a freedesktop.org-style trashcan."
6365 "Move the file (or directory) named FILENAME to the trash.
6366 When `delete-by-moving-to-trash' is non-nil, this function is
6367 called by `delete-file' and `delete-directory' instead of
6368 deleting files outright.
6370 If the function `system-move-file-to-trash' is defined, call it
6371 with FILENAME as an argument.
6372 Otherwise, if `trash-directory' is non-nil, move FILENAME to that
6373 directory.
6374 Otherwise, trash FILENAME using the freedesktop.org conventions,
6375 like the GNOME, KDE and XFCE desktop environments. Emacs only
6379 ;; If `trash-directory' is non-nil, move the file there.
6383 trash-dir)))
6384 ;; We can't trash a parent directory of trash-directory.
6387 trash-dir filename))
6390 ;; Ensure that the trashed file-name is unique.
6397 ;; If `system-move-file-to-trash' is defined, use it.
6400 ;; Otherwise, use the freedesktop.org method, as specified at
6401 ;; http://freedesktop.org/wiki/Specifications/trash-spec
6412 ;; Check if we have permissions to delete.
6416 ;; The trashed file cannot be the trash dir or its parent.
6419 trash-files-dir filename))
6422 trash-info-dir filename))
6424 ;; Ensure that the trash directory exists; otherwise, create it.
6433 ;; Try to move to trash with .trashinfo undo information
6438 ;; Perform url-encoding on FN. For compatibility with
6439 ;; other programs (e.g. XFCE Thunar), allow literal "/"
6440 ;; for path separators.
6445 ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A
6446 ?B ?C ?D ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O
6459 fn))
6464 ;; Attempt to make .trashinfo file, trying up to 5
6465 ;; times. The .trashinfo file is opened with O_EXCL,
6466 ;; as per trash-spec 0.7, even if that can be a problem
6467 ;; on old NFS versions...
6471 trash-files-dir))
6473 success info-fn)
6478 trash-info-dir))
6486 ;; Uniqify new-fn. (Some file managers do not
6487 ;; like Emacs-style backup file names---e.g. bug
6488 ;; 170956 in Konqueror bug tracker.)
6493 ;; Finally, try to move the file to the trashcan.
6497 \f
6521 ;;; files.el ends here