| blob | 8b131e04ebca44f89ee4cab6f36be88e9b5d6145 |
1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994, 1995, 1996,
4 ;; 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
5 ;; 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
7 ;; Maintainer: FSF
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software: you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation, either version 3 of the License, or
14 ;; (at your option) any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
24 ;;; Commentary:
26 ;; Defines most of Emacs's file- and directory-handling functions,
27 ;; including basic file visiting, backup generation, link handling,
28 ;; ITS-id version control, load- and write-hook handling, and the like.
30 ;;; Code:
37 "Backups of edited data files."
41 "Finding files."
46 "Non-nil means delete auto-save file when a buffer is saved or killed.
48 Note that the auto-save file will not be deleted if the buffer is killed
49 when it has unsaved changes."
54 nil
55 "Alist of abbreviations for file directories.
56 A list of elements of the form (FROM . TO), each meaning to replace
57 FROM with TO when it appears in a directory name. This replacement is
58 done when setting up the default directory of a newly visited file.
61 FROM and TO should be equivalent names, which refer to the
62 same directory. Do not use `~' in the TO strings;
63 they should be ordinary absolute directory names.
65 Use this feature when you have directories which you normally refer to
66 via absolute symbolic links. Make TO the name of the link, and FROM
67 the name it is linked to."
76 "Non-nil means make a backup of a file the first time it is saved.
77 This can be done by renaming the file or by copying.
79 Renaming means that Emacs renames the existing file so that it is a
80 backup file, then writes the buffer into a new file. Any other names
81 that the old file had will now refer to the backup file. The new file
82 is owned by you and its group is defaulted.
84 Copying means that Emacs copies the existing file into the backup
85 file, then writes the buffer on top of the existing file. Any other
86 names that the old file had will now refer to the new (edited) file.
87 The file's owner and group are unchanged.
89 The choice of renaming or copying is controlled by the variables
90 `backup-by-copying', `backup-by-copying-when-linked',
91 `backup-by-copying-when-mismatch' and
92 `backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
96 ;; Do this so that local variables based on the file name
97 ;; are not overridden by the major mode.
99 "Non-nil means don't make a backup, regardless of the other parameters.
100 This variable is intended for use by making it local to a buffer.
105 "Non-nil means always use copying to create backup files.
106 See documentation of variable `make-backup-files'."
111 "Non-nil means use copying to create backups for files with multiple names.
112 This causes the alternate names to refer to the latest version as edited.
113 This variable is relevant only if `backup-by-copying' is nil."
118 "Non-nil means create backups by copying if this preserves owner or group.
119 Renaming may still be used (subject to control of other variables)
120 when it would not result in changing the owner or group of the file;
121 that is, for files which are owned by you and whose group matches
122 the default for a new file created there by you.
123 This variable is relevant only if `backup-by-copying' is nil."
128 "Non-nil means create backups by copying to preserve a privileged owner.
129 Renaming may still be used (subject to control of other variables)
130 when it would not result in changing the owner of the file or if the owner
131 has a user id greater than the value of this variable. This is useful
132 when low-numbered uid's are used for special system users (such as root)
133 that must maintain ownership of certain files.
134 This variable is relevant only if `backup-by-copying' and
135 `backup-by-copying-when-mismatch' are nil."
140 "Predicate that looks at a file name and decides whether to make backups.
144 "Non-nil in a buffer means always offer to save buffer on exit.
145 Do so even if the buffer is not visiting a file.
146 Automatically local in all buffers."
152 "Non-nil means find a file under alternative names, in existing buffers.
153 This means if any existing buffer is visiting the file you want
154 under another name, you get the existing buffer instead of a new buffer."
159 "Non-nil means visit a file under its truename.
160 The truename of a file is found by chasing all links
161 both at the file level and at the levels of the containing directories."
167 "Specify which files should be reverted without query.
168 The value is a list of regular expressions.
169 If the file name matches one of these regular expressions,
170 then `revert-buffer' reverts the file without querying
171 if the file has changed on disk and you have not edited the buffer."
176 "The device number and file number of the file visited in the current buffer.
177 The value is a list of the form (FILENUM DEVNUM).
178 This pair of numbers uniquely identifies the file.
196 "The directory for writing temporary files."
203 "The directory for writing small temporary files.
204 If non-nil, this directory is used instead of `temporary-file-directory'
205 by programs that create small temporary files. This is for systems that
206 have fast storage with limited space, such as a RAM disk."
211 ;; The system null device. (Should reference NULL_DEVICE from C.)
239 "Non-nil means protect against I/O errors while saving files.
240 Some modes set this non-nil in particular buffers.
242 This feature works by writing the new contents into a temporary file
243 and then renaming the temporary file to replace the original.
244 In this way, any I/O error in writing leaves the original untouched,
245 and there is never any instant where the file is nonexistent.
247 Note that this feature forces backups to be made by copying.
248 Yet, at the same time, saving a precious file
249 breaks any hard links between it and other files.
251 This feature is advisory: for example, if the directory in which the
252 file is being saved is not writable, Emacs may ignore a non-nil value
253 of `file-precious-flag' and write directly into the file.
255 See also: `break-hardlink-on-save'."
260 "Non-nil means when saving a file that exists under several names
261 \(i.e., has multiple hardlinks), break the hardlink associated with
262 `buffer-file-name' and write to a new file, so that the other
263 instances of the file are not affected by the save.
265 If `buffer-file-name' refers to a symlink, do not break the symlink.
267 Unlike `file-precious-flag', `break-hardlink-on-save' is not advisory.
268 For example, if the directory in which a file is being saved is not
269 itself writable, then error instead of saving in some
270 hardlink-nonbreaking way.
272 See also `backup-by-copying' and `backup-by-copying-when-linked'."
278 "Control use of version numbers for backup files.
279 When t, make numeric backup versions unconditionally.
280 When nil, make them for files that have some already.
281 The value `never' means do not make them."
291 "When cleaning directory, number of versions to keep."
297 "If t, delete excess backup versions silently.
298 If nil, ask confirmation. Any other value prevents any trimming."
305 "Number of oldest versions to keep when a new numbered backup is made."
311 "Number of newest versions to keep when a new numbered backup is made.
312 Includes the new backup. Must be > 0"
318 "Whether to add a newline automatically at the end of the file.
320 A value of t means do this only when the file is about to be saved.
321 A value of `visit' means do this right after the file is visited.
322 A value of `visit-save' means do it at both of those times.
323 Any other non-nil value means ask user whether to add a newline, when saving.
324 A value of nil means don't add newlines.
326 Certain major modes set this locally to the value obtained
327 from `mode-require-final-newline'."
336 "Whether to add a newline at end of file, in certain major modes.
337 Those modes set `require-final-newline' to this value when you enable them.
338 They do so because they are often used for files that are supposed
339 to end in newlines, and the question is how to arrange that.
341 A value of t means do this only when the file is about to be saved.
342 A value of `visit' means do this right after the file is visited.
343 A value of `visit-save' means do it at both of those times.
344 Any other non-nil value means ask user whether to add a newline, when saving.
346 A value of nil means do not add newlines. That is a risky choice in this
347 variable since this value is used for modes for files that ought to have
348 final newlines. So if you set this to nil, you must explicitly check and
349 add a final newline, whenever you save a file that really needs one."
359 "Non-nil says by default do auto-saving of every file-visiting buffer."
365 ;; Don't put "\\2" inside expand-file-name, since it will be
366 ;; transformed to "/2" on DOS/Windows.
368 "Transforms to apply to buffer file name before making auto-save file name.
369 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
370 REGEXP is a regular expression to match against the file name.
371 If it matches, `replace-match' is used to replace the
372 matching part with REPLACEMENT.
373 If the optional element UNIQUIFY is non-nil, the auto-save file name is
374 constructed by taking the directory part of the replaced file-name,
375 concatenated with the buffer file name with all directory separators
376 changed to `!' to prevent clashes. This will not work
377 correctly if your filesystem truncates the resulting name.
379 All the transforms in the list are tried, in the order they are listed.
380 When one transform applies, its result is final;
381 no further transforms are tried.
383 The default value is set up to put the auto-save file into the
384 temporary directory (see the variable `temporary-file-directory') for
385 editing a remote file.
387 On MS-DOS filesystems without long names this variable is always
388 ignored."
396 "Non-nil means save word abbrevs too when files are saved.
397 If `silently', don't ask the user before saving."
402 "Non-nil means allow `find-file' to visit directories.
403 To visit the directory, `find-file' runs `find-directory-functions'."
408 "List of functions to try in sequence to visit a directory.
409 Each function is called with the directory name as the sole argument
410 and should return either a buffer or nil."
414 ;; FIXME: also add a hook for `(thing-at-point 'filename)'
416 "List of functions to try in sequence to get a file name at point.
417 Each function should return either nil or a file name found at the
418 location of point in the current buffer."
422 ;;;It is not useful to make this a local variable.
423 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
425 "List of functions to be called for `find-file' on nonexistent file.
426 These functions are called as soon as the error is detected.
427 Variable `buffer-file-name' is already set up.
432 ;;;It is not useful to make this a local variable.
433 ;;;(put 'find-file-hooks 'permanent-local t)
436 "List of functions to be called after a buffer is loaded from a file.
437 The buffer's local variables (if any) will have been processed before the
438 functions are called."
445 "List of functions to be called before writing out a buffer to a file.
446 If one of them returns non-nil, the file is considered already written
447 and the rest are not called.
448 These hooks are considered to pertain to the visited file.
449 So any buffer-local binding of this variable is discarded if you change
451 change the major mode.
453 This hook is not run if any of the functions in
454 `write-contents-functions' returns non-nil. Both hooks pertain
455 to how to save a buffer to file, for instance, choosing a suitable
456 coding system and setting mode bits. (See Info
457 node `(elisp)Saving Buffers'.) To perform various checks or
468 "List of functions to be called before writing out a buffer to a file.
469 If one of them returns non-nil, the file is considered already written
470 and the rest are not called and neither are the functions in
471 `write-file-functions'.
473 This variable is meant to be used for hooks that pertain to the
474 buffer's contents, not to the particular visited file; thus,
475 `set-visited-file-name' does not clear this variable; but changing the
476 major mode does clear it.
478 For hooks that _do_ pertain to the particular visited file, use
479 `write-file-functions'. Both this variable and
480 `write-file-functions' relate to how a buffer is saved to file.
481 To perform various checks or updates before the buffer is saved,
488 "Control use of local variables in files you visit.
489 The value can be t, nil, :safe, :all, or something else.
491 A value of t means file local variables specifications are obeyed
492 if all the specified variable values are safe; if any values are
493 not safe, Emacs queries you, once, whether to set them all.
494 \(When you say yes to certain values, they are remembered as safe.)
496 :safe means set the safe variables, and ignore the rest.
497 :all means set all variables, whether safe or not.
498 (Don't set it permanently to :all.)
499 A value of nil means always ignore the file local variables.
501 Any other value means always query you once whether to set them all.
502 \(When you say yes to certain values, they are remembered as safe, but
505 This variable also controls use of major modes specified in
506 a -*- line.
509 always obeys file local variable specifications and the -*- line,
510 and ignores this variable."
511 :risky t
520 "Like `enable-local-variables' but meant for buffer-local bindings.
521 The meaningful values are nil and non-nil. The default is non-nil.
522 If a major mode sets this to nil, buffer-locally, then any local
523 variables list in the file will be ignored.
525 This variable does not affect the use of major modes
530 The value can be t, nil or something else.
531 A value of t means obey `eval' variables.
532 A value of nil means ignore them; anything else means query."
533 :risky t
539 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
548 "Non-nil means buffers visiting files read-only do so in view mode.
549 In fact, this means that all read-only buffers normally have
550 View mode enabled, including buffers that are read-only because
551 you visit a file you cannot alter, and buffers you make read-only
557 "History list of file names entered in the minibuffer.
559 Maximum length of the history list is determined by the value
561 \f
564 "Provides support for ange-ftp host name completion.
565 Runs the usual ange-ftp hook, but only for completion operations."
566 ;; Having this here avoids the need to load ange-ftp when it's not
567 ;; really in use.
573 inhibit-file-name-handlers)))
581 "Convert a standard file's name to something suitable for the OS.
582 This means to guarantee valid names and perhaps to canonicalize
583 certain patterns.
585 FILENAME should be an absolute file name since the conversion rules
586 sometimes vary depending on the position in the file name. E.g. c:/foo
587 is a valid DOS file name, but c:/bar/c:/foo is not.
589 This function's standard definition is trivial; it just returns
590 the argument. However, on Windows and DOS, replace invalid
591 characters. On DOS, make sure to obey the 8.3 limitations.
592 In the native Windows build, turn Cygwin names into native names,
593 and also turn slashes into backslashes if the shell requires it (see
594 `w32-shell-dos-semantics').
596 See Info node `(elisp)Standard File Names' for more details."
601 ;; Replace invalid filename characters with !
605 name))
613 "Read directory name, prompting with PROMPT and completing in directory DIR.
614 Value is not expanded---you must call `expand-file-name' yourself.
615 Default name to DEFAULT-DIRNAME if user exits with the same
616 non-empty string that was inserted by this function.
617 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
618 or just DIR if INITIAL is nil.)
619 If the user exits with an empty minibuffer, this function returns
620 an empty string. (This can only happen if the user erased the
621 pre-inserted contents or if `insert-default-directory' is nil.)
622 Fourth arg MUSTMATCH non-nil means require existing directory's name.
623 Non-nil and non-t means also require confirmation after completion.
624 Fifth arg INITIAL specifies text to start with.
625 DIR should be an absolute directory name. It defaults to
626 the value of `default-directory'."
631 dir))
632 mustmatch initial
635 \f
637 "Show the current default directory."
642 "Value of the CDPATH environment variable, as a list.
646 "Explode a search path into a list of directory names.
647 Directories are separated by occurrences of `path-separator'
648 \(which is colon in GNU and GNU-like systems)."
649 ;; We could use split-string here.
657 nil
662 cd-list)))
665 "Change current directory to given absolute file name DIR."
666 ;; Put the name into directory syntax now,
667 ;; because otherwise expand-file-name may give some bad results.
669 ;; We used to additionally call abbreviate-file-name here, for an
670 ;; unknown reason. Problem is that most buffers are setup
671 ;; without going through cd-absolute and don't call
672 ;; abbreviate-file-name on their default-directory, so the few that
673 ;; do end up using a superficially different directory.
685 "Make DIR become the current buffer's default directory.
686 If your environment includes a `CDPATH' variable, try each one of
687 that list of directories (separated by occurrences of
688 `path-separator') when resolving a relative directory name.
689 The path separator is colon in GNU and GNU-like systems."
692 default-directory default-directory
708 cd-path)
709 nil))
713 "Load the Lisp file named FILE."
714 ;; This is a case where .elc makes a lot of sense.
721 "Search for FILENAME through PATH.
722 If found, return the absolute file name of FILENAME, with its suffixes;
723 otherwise return nil.
724 PATH should be a list of directories to look in, like the lists in
725 `exec-path' or `load-path'.
726 If SUFFIXES is non-nil, it should be a list of suffixes to append to
729 If non-nil, PREDICATE is used instead of `file-readable-p'.
730 PREDICATE can also be an integer to pass to the `access' system call,
731 in which case file-name handlers are ignored. This usage is deprecated.
733 For compatibility, PREDICATE can also be one of the symbols
734 `executable', `readable', `writable', or `exists', or a list of
735 one or more of those symbols."
746 "Do completion for file names passed to `locate-file'."
749 ;; FIXME: maybe we should use completion-file-name-table instead,
750 ;; tho at least for `load', the arg is passed through
751 ;; substitute-in-file-name for historical reasons.
770 string-file dir))
776 string-dir names string-file pred action)))))
779 "Do completion for file names passed to `locate-file'.
780 PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
783 string nil action))
788 "Regexp of directory names which stop the search in `locate-dominating-file'.
789 Any directory whose name matches this regexp will be treated like
790 a kind of root directory by `locate-dominating-file' which will stop its search
791 when it bumps into it.
792 The default regexp prevents fruitless and time-consuming attempts to find
793 special files in directories in which filenames are interpreted as hostnames,
796 ;; (defun locate-dominating-files (file regexp)
797 ;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
798 ;; Stop at the first parent where a matching file is found and return the list
799 ;; of files that that match in this directory."
800 ;; (catch 'found
801 ;; ;; `user' is not initialized yet because `file' may not exist, so we may
802 ;; ;; have to walk up part of the hierarchy before we find the "initial UID".
803 ;; (let ((user nil)
804 ;; ;; Abbreviate, so as to stop when we cross ~/.
805 ;; (dir (abbreviate-file-name (file-name-as-directory file)))
806 ;; files)
807 ;; (while (and dir
808 ;; ;; As a heuristic, we stop looking up the hierarchy of
809 ;; ;; directories as soon as we find a directory belonging to
810 ;; ;; another user. This should save us from looking in
811 ;; ;; things like /net and /afs. This assumes that all the
812 ;; ;; files inside a project belong to the same user.
813 ;; (let ((prev-user user))
814 ;; (setq user (nth 2 (file-attributes dir)))
815 ;; (or (null prev-user) (equal user prev-user))))
816 ;; (if (setq files (condition-case nil
817 ;; (directory-files dir 'full regexp 'nosort)
818 ;; (error nil)))
819 ;; (throw 'found files)
820 ;; (if (equal dir
821 ;; (setq dir (file-name-directory
822 ;; (directory-file-name dir))))
823 ;; (setq dir nil))))
824 ;; nil)))
827 "Look up the directory hierarchy from FILE for a file named NAME.
828 Stop at the first parent directory containing a file NAME,
829 and return the directory. Return nil if not found."
830 ;; We used to use the above locate-dominating-files code, but the
831 ;; directory-files call is very costly, so we're much better off doing
832 ;; multiple calls using the code in here.
833 ;;
834 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
835 ;; `name' in /home or in /.
839 ;; `user' is not initialized outside the loop because
840 ;; `file' may not exist, so we may have to walk up part of the
841 ;; hierarchy before we find the "initial UID".
843 try)
846 ;; FIXME: Disabled this heuristic because it is sometimes
847 ;; inappropriate.
848 ;; As a heuristic, we stop looking up the hierarchy of
849 ;; directories as soon as we find a directory belonging
850 ;; to another user. This should save us from looking in
851 ;; things like /net and /afs. This assumes that all the
852 ;; files inside a project belong to the same user.
853 ;; (let ((prev-user user))
854 ;; (setq user (nth 2 (file-attributes file)))
855 ;; (and prev-user (not (equal user prev-user))))
863 root))
867 "Search for COMMAND in `exec-path' and return the absolute file name.
868 Return nil if COMMAND is not found anywhere in `exec-path'."
869 ;; Use 1 rather than file-executable-p to better match the behavior of
870 ;; call-process.
874 "Load the Emacs Lisp library named LIBRARY.
875 This is an interface to the function `load'. LIBRARY is searched
876 for in `load-path', both with and without `load-suffixes' (as
877 well as `load-file-rep-suffixes').
879 See Info node `(emacs)Lisp Libraries' for more details.
880 See `load-file' for a different interface to `load'."
884 load-path
889 "Test whether FILE specifies a location on a remote system.
890 Returns nil or a string identifying the remote connection (ideally
891 a prefix of FILE). For example, the remote identification for filename
894 less reliable than accessing local files.
895 Furthermore, relative file names do not work across remote connections.
897 IDENTIFICATION specifies which part of the identification shall
898 be returned as string. IDENTIFICATION can be the symbol
899 `method', `user', `host' or `localname'; any other value is
900 handled like nil and means to return the complete identification
901 string.
903 If CONNECTED is non-nil, the function returns an identification only
904 if FILE is located on a remote system, and a connection is established
905 to that remote system.
907 `file-remote-p' will never open a connection on its own."
911 nil)))
914 "Copy the file FILE into a temporary file on this machine.
915 Returns the name of the local copy, or nil, if FILE is directly
916 accessible."
917 ;; This formerly had an optional BUFFER argument that wasn't used by
918 ;; anything.
922 nil)))
925 "Return the truename of FILENAME, which should be absolute.
926 The truename of a file name is found by chasing symbolic links
927 both at the level of the file and at the level of the directories
928 containing it, until no links are left at any level.
931 ;; COUNTER and PREV-DIRS are only used in recursive calls.
932 ;; COUNTER can be a cons cell whose car is the count of how many
933 ;; more links to chase before getting an error.
934 ;; PREV-DIRS can be a cons cell whose car is an alist
935 ;; of truenames we've just recently computed.
949 ;; For speed, remove the ange-ftp completion handler from the list.
950 ;; We know it's not needed here.
951 ;; For even more speed, do this only on the outermost call.
958 ;; andrewi@harlequin.co.uk - none of the following code (except for
959 ;; invoking the file-name handler) currently applies on Windows
960 ;; (ie. there are no native symlinks), but there is an issue with
961 ;; case differences being ignored by the OS, and short "8.3 DOS"
962 ;; name aliases existing for all files. (The short names are not
963 ;; reported by directory-files, but can be used to refer to files.)
964 ;; It seems appropriate for file-truename to resolve these issues in
965 ;; the most natural way, which on Windows is to call the function
966 ;; `w32-long-file-name' - this returns the exact name of a file as
967 ;; it is stored on disk (expanding short name aliases with the full
968 ;; name in the process).
971 ;; For file name that has a special handler, call handler.
972 ;; This is so that ange-ftp can save time by doing a no-op.
975 ;; If filename contains a wildcard, newname will be the old name.
977 ;; If filename exists, use the long name. If it doesn't exist,
978 ;; drill down until we find a directory that exists, and use
979 ;; the long name of that, with the extra non-existent path
980 ;; components concatenated.
982 missing rest)
985 ;; Include the preceding directory separator in the missing
986 ;; part so subsequent recursion on the rest works.
991 ""
996 ;; If this file directly leads to a link, process that iteratively
997 ;; so that we don't use lots of stack.
1003 ;; For file name that has a special handler, call handler.
1004 ;; This is so that ange-ftp can save time by doing a no-op.
1007 done t)
1009 target dirfile)
1010 ;; Get the truename of the directory.
1012 ;; If these are equal, we have the (or a) root directory.
1014 ;; If this is the same dir we last got the truename for,
1015 ;; save time--don't recalculate.
1025 done t)
1028 done t)
1029 ;; Put it back on the file name.
1031 ;; Is the file name the name of a link?
1034 ;; Yes => chase that link, then start all over
1035 ;; since the link may point to a directory name that uses links.
1036 ;; We can't safely use expand-file-name here
1037 ;; since target might look like foo/../bar where foo
1038 ;; is itself a link. Instead, we handle . and .. above.
1041 target
1043 done nil)
1044 ;; No, we are done!
1046 filename))
1049 "Chase links in FILENAME until a name that is not a link.
1050 Unlike `file-truename', this does not check whether a parent
1051 directory name is a symbolic link.
1052 If the optional argument LIMIT is a number,
1053 it means chase no more than that many links and then stop."
1061 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
1064 ;; Handle `..' by hand, since it needs to work in the
1065 ;; target of any directory symlink.
1066 ;; This code is not quite complete; it does not handle
1067 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
1071 ;; Chase links in the default dir of the symlink.
1075 ;; Now find the parent of that dir.
1079 newname))
1082 "Create a temporary file.
1083 The returned file name (created by appending some random characters at the end
1084 of PREFIX, and expanding against `temporary-file-directory' if necessary),
1085 is guaranteed to point to a newly created empty file.
1086 You can then use `write-region' to write new data into the file.
1088 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1090 If SUFFIX is non-nil, add that at the end of the file name."
1092 file)
1095 ;; Create temp files with strict access rights. It's easy to
1096 ;; loosen them later, whereas it's impossible to close the
1097 ;; time-window of loose permissions otherwise.
1105 temporary-file-directory)
1107 temporary-file-directory))))
1113 nil)
1115 ;; the file was somehow created by someone else between
1116 ;; `make-temp-name' and `write-region', let's try again.
1117 nil)
1118 file)
1119 ;; Reset the umask.
1123 "Change the encoding of FILE's name from CODING to NEW-CODING.
1124 The value is a new name of FILE.
1125 Signals a `file-already-exists' error if a file of the new name
1126 already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
1127 is non-nil. A number as fourth arg means request confirmation if
1128 the new name already exists. This is what happens in interactive
1129 use with M-x."
1132 default-file-name-coding-system))
1134 from-coding to-coding)
1136 ;; We provide the default coding only when it seems that
1137 ;; the filename is correctly decoded by the default
1138 ;; coding.
1144 filename default-coding)
1145 default-coding))
1149 ;; We provide the default coding only when a user is going to
1150 ;; change the encoding not from the default coding.
1154 filename from-coding)))
1157 filename from-coding default-coding)
1158 default-coding)))
1162 default-file-name-coding-system))
1163 ;; FILE should have been decoded by DEFAULT-CODING.
1167 ;; Suppress further encoding.
1172 newname))
1173 \f
1175 "Whether confirmation is requested before visiting a new file or buffer.
1176 If nil, confirmation is not requested.
1177 If the value is `after-completion', confirmation is only
1178 requested if the user called `minibuffer-complete' right before
1179 `minibuffer-complete-and-exit'.
1180 Any other non-nil value means to request confirmation.
1182 This affects commands like `switch-to-buffer' and `find-file'."
1190 "Whether to request confirmation before visiting a new file or buffer.
1191 The variable `confirm-nonexistent-file-or-buffer' determines the
1192 return value, which may be passed as the REQUIRE-MATCH arg to
1193 `read-buffer' or `find-file-read-args'."
1201 "Read the name of a buffer to switch to and return as a string.
1202 It is intended for `switch-to-buffer' family of commands since they
1203 need to omit the name of current buffer from the list of completions
1204 and default values."
1209 ;; Since rbts-completion-table is built dynamically, we
1210 ;; can't just add it to the default value of
1211 ;; icomplete-with-completion-tables, so we add it
1212 ;; here manually.
1217 icomplete-with-completion-tables))))
1222 "Select the buffer specified by BUFFER-OR-NAME in another window.
1223 BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
1224 nil. Return the buffer switched to.
1226 If called interactively, prompt for the buffer name using the
1227 minibuffer. The variable `confirm-nonexistent-file-or-buffer'
1228 determines whether to request confirmation before creating a new
1229 buffer.
1231 If BUFFER-OR-NAME is a string and does not identify an existing
1232 buffer, create a new buffer with that name. If BUFFER-OR-NAME is
1233 nil, switch to the buffer returned by `other-buffer'.
1235 Optional second argument NORECORD non-nil means do not put this
1236 buffer at the front of the list of recently selected ones.
1238 This uses the function `display-buffer' as a subroutine; see its
1239 documentation for additional customization information."
1243 same-window-buffer-names same-window-regexps)
1247 "Switch to buffer BUFFER-OR-NAME in another frame.
1248 BUFFER-OR-NAME may be a buffer, a string \(a buffer name), or
1249 nil. Return the buffer switched to.
1251 If called interactively, prompt for the buffer name using the
1252 minibuffer. The variable `confirm-nonexistent-file-or-buffer'
1253 determines whether to request confirmation before creating a new
1254 buffer.
1256 If BUFFER-OR-NAME is a string and does not identify an existing
1257 buffer, create a new buffer with that name. If BUFFER-OR-NAME is
1258 nil, switch to the buffer returned by `other-buffer'.
1260 Optional second arg NORECORD non-nil means do not put this
1261 buffer at the front of the list of recently selected ones.
1263 This uses the function `display-buffer' as a subroutine; see its
1264 documentation for additional customization information."
1268 same-window-buffer-names same-window-regexps)
1272 "Display buffer BUFFER in another frame.
1273 This uses the function `display-buffer' as a subroutine; see
1274 its documentation for additional customization information."
1277 same-window-buffer-names same-window-regexps
1279 new-window)
1281 ;; This may have been here in order to prevent the new frame from hiding
1282 ;; the old frame. But it does more harm than good.
1283 ;; Maybe we should call `raise-window' on the old-frame instead? --Stef
1284 ;;(lower-frame (window-frame new-window))
1286 ;; This may have been here in order to make sure the old-frame gets the
1287 ;; focus. But not only can it cause an annoying flicker, with some
1288 ;; window-managers it just makes the window invisible, with no easy
1289 ;; way to recover it. --Stef
1290 ;;(make-frame-invisible (window-frame old-window))
1291 ;;(make-frame-visible (window-frame old-window))
1292 ))
1295 "Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
1296 BODY should use the minibuffer at most once.
1297 Recursive uses of the minibuffer are unaffected (FUN is not
1298 called additional times).
1300 This macro actually adds an auxiliary function that calls FUN,
1301 rather than FUN itself, to `minibuffer-setup-hook'."
1307 ;; Clear out this hook so it does not interfere
1308 ;; with any recursive minibuffer usage.
1319 t))
1322 "Edit file FILENAME.
1323 Switch to a buffer visiting file FILENAME,
1324 creating one if none already exists.
1325 Interactively, the default if you just type RET is the current directory,
1326 but the visited file name is available through the minibuffer history:
1327 type M-n to pull it into the minibuffer.
1329 You can visit files on remote machines by specifying something
1330 like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
1331 also visit local files as a different user by specifying
1332 /sudo::FILE for the file name.
1333 See the Info node `(tramp)Filename Syntax' in the Tramp Info
1334 manual, for more about this.
1336 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1337 expand wildcards (if any) and visit multiple files. You can
1338 suppress wildcard expansion by setting `find-file-wildcards' to nil.
1340 To visit a file without any kind of conversion and without
1351 "Edit file FILENAME, in another window.
1354 an existing one. See the function `display-buffer'.
1356 Interactively, the default if you just type RET is the current directory,
1357 but the visited file name is available through the minibuffer history:
1358 type M-n to pull it into the minibuffer.
1360 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1361 expand wildcards (if any) and visit multiple files."
1374 "Edit file FILENAME, in another frame.
1377 an existing one. See the function `display-buffer'.
1379 Interactively, the default if you just type RET is the current directory,
1380 but the visited file name is available through the minibuffer history:
1381 type M-n to pull it into the minibuffer.
1383 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1384 expand wildcards (if any) and visit multiple files."
1397 "Edit the existing file FILENAME.
1399 file names with wildcards."
1408 "Edit file FILENAME but don't allow changes.
1422 value))
1425 "Edit file FILENAME in another window but don't allow changes.
1439 value))
1442 "Edit file FILENAME in another frame but don't allow changes.
1456 value))
1459 "Find file FILENAME as a replacement for the file in the next window.
1460 This command does not select that window.
1464 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1465 expand wildcards (if any) and replace the file with multiple files."
1476 "Find alternate file: " file-dir nil
1478 t))))
1486 "Find file FILENAME, select its buffer, kill previous buffer.
1487 If the current buffer now contains an empty file that you just visited
1488 \(presumably by mistake), use this command to visit the file you really want.
1492 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1493 expand wildcards (if any) and replace the file with multiple files.
1495 If the current buffer is an indirect buffer, or the base buffer
1496 for one or more indirect buffers, the other buffer(s) are not
1497 killed."
1506 "Find alternate file: " file-dir nil
1508 t)))
1523 ;; Run `kill-buffer-hook' here. It needs to happen before
1524 ;; variables like `buffer-file-name' etc are set to nil below,
1525 ;; because some of the hooks that could be invoked
1526 ;; (e.g., `save-place-to-alist') depend on those variables.
1527 ;;
1528 ;; Note that `kill-buffer-hook' is not what queries whether to
1529 ;; save a modified buffer visiting a file. Rather, `kill-buffer'
1530 ;; asks that itself. Thus, there's no need to temporarily do
1531 ;; `(set-buffer-modified-p nil)' before running this hook.
1533 ;; Okay, now we can end-of-life the old buffer.
1540 ;; This prevents us from finding the same buffer
1541 ;; if we specified the same file again.
1545 ;; Likewise for dired buffers.
1549 ;; This executes if find-file gets an error
1550 ;; and does not really find anything.
1551 ;; We put things back as they were.
1552 ;; If find-file actually finds something, we kill obuf below.
1561 ;; We already ran these; don't run them again.
1564 \f
1566 "Create a suitably named buffer for visiting FILENAME, and return it.
1567 FILENAME (sans directory) is used unchanged if that name is free;
1568 otherwise a string <2> or <3> or ... is appended to get an unused name.
1569 Spaces at the start of FILENAME (sans directory) are removed."
1578 "Create and return a buffer with a name based on NAME.
1579 Choose the buffer's name using `generate-new-buffer-name'."
1583 "Regexp to match the automounter prefix in a directory name."
1591 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1593 home directory is a root directory) and removes automounter prefixes
1594 \(see the variable `automount-dir-prefix')."
1595 ;; Get rid of the prefixes added by the automounter.
1602 ;; Avoid treating /home/foo as /home/Foo during `~' substitution.
1603 ;; To fix this right, we need a `file-name-case-sensitive-p'
1604 ;; function, but we don't have that yet, so just guess.
1607 ;; If any elt of directory-abbrev-alist matches this name,
1608 ;; abbreviate accordingly.
1614 ;; Compute and save the abbreviated homedir name.
1615 ;; We defer computing this until the first time it's needed, to
1616 ;; give time for directory-abbrev-alist to be set properly.
1617 ;; We include a slash at the end, to avoid spurious matches
1618 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1625 ;; If FILENAME starts with the abbreviated homedir,
1626 ;; make it start with `~' instead.
1628 ;; If the home dir is just /, don't change it.
1631 ;; MS-DOS root directories can come with a drive letter;
1632 ;; Novell Netware allows drive letters beyond `Z:'.
1640 filename)))
1643 "List of logical names for which visiting shouldn't save the true dirname."
1648 "Return the buffer visiting file FILENAME (a string).
1649 This is like `get-file-buffer', except that it checks for any buffer
1650 visiting the same file, possibly under a different name.
1651 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1652 and others are ignored.
1653 If there is no such live buffer, return nil."
1666 found)
1676 ;; Verify this buffer's file number
1677 ;; still belongs to its file.
1680 attributes)
1684 found))))
1685 \f
1687 "Non-nil means file-visiting commands should handle wildcards.
1688 For example, if you specify `*.c', that would visit all the files
1689 whose names match the pattern."
1695 "Non-nil means suppress warning messages for symlinked files.
1696 When nil, Emacs prints a warning when visiting a file that is already
1697 visited, but with a different name. Setting this option to t
1698 suppresses this warning."
1704 "Maximum size of file above which a confirmation is requested.
1705 When nil, never request confirmation."
1712 "If file SIZE larger than `large-file-warning-threshold', allow user to abort.
1713 OP-TYPE specifies the file operation being performed (for message to user)."
1723 "Read file FILENAME into a buffer and return the buffer.
1724 If a buffer exists visiting FILENAME, return that one, but
1725 verify that the file has not changed since visited or saved.
1726 The buffer is not selected, just returned to the caller.
1727 Optional second arg NOWARN non-nil means suppress any warning messages.
1728 Optional third arg RAWFILE non-nil means the file is read literally.
1729 Optional fourth arg WILDCARDS non-nil means do wildcard processing
1730 and visit all the matching files. When wildcards are actually
1731 used and expanded, return a list of buffers that are visiting
1732 the various files."
1739 'find-directory-functions
1742 filename)))
1745 find-file-wildcards
1759 ;; Find any buffer for a file which has same truename.
1761 ;; Let user know if there is a buffer with the same truename.
1765 find-file-suppress-same-file-warnings
1769 ;; Optionally also find that buffer.
1772 ;; Check to see if the file looks uncommonly large.
1776 ;; We are using an existing buffer.
1783 ;; Certain files should be reverted automatically
1784 ;; if they have changed on disk and not in the buffer.
1792 found))
1802 "File %s changed on disk. Discard your edits? "
1807 "File %s changed on disk. Discard your edits in %s? "
1815 ;; Check if a formerly read-only file has become
1816 ;; writable and vice versa, but if the buffer agrees
1817 ;; with the new state of the file, that is ok too.
1825 buffer-file-name
1834 ;; It is confusing to ask whether to visit
1835 ;; non-literally if they have the file in
1836 ;; hexl-mode.
1842 "The file %s is already visited normally,
1843 and you have edited the buffer. Now you have asked to visit it literally,
1844 meaning no coding system handling, format conversion, or local variables.
1845 Emacs can only visit a file in one way at a time.
1847 Do you want to save the file, and visit it literally instead? "
1848 "The file %s is already visited literally,
1849 meaning no coding system handling, format conversion, or local variables.
1850 You have edited the buffer. Now you have asked to visit the file normally,
1851 but Emacs can only visit a file in one way at a time.
1858 rawfile truename number))
1862 "\
1863 Do you want to discard your changes, and visit the file literally now? "
1864 "\
1867 rawfile truename number)
1873 "The file %s is already visited normally.
1874 You have asked to visit it literally,
1875 meaning no coding system decoding, format conversion, or local variables.
1876 But Emacs can only visit a file in one way at a time.
1878 Do you want to revisit the file literally now? "
1879 "The file %s is already visited literally,
1880 meaning no coding system decoding, format conversion, or local variables.
1881 You have asked to visit it normally,
1882 but Emacs can only visit a file in one way at a time.
1887 rawfile truename number)
1890 ;; Return the buffer we are using.
1891 buf)
1892 ;; Create a new buffer.
1894 ;; find-file-noselect-1 may use a different buffer.
1896 rawfile truename number))))))
1902 ;; Needed in case we are re-visiting the file with a different
1903 ;; text representation.
1920 filename)))
1921 ;; Unconditionally set error
1931 filename)))
1932 ;; Run find-file-not-found-functions until one returns non-nil.
1934 ;; If they fail too, set error.
1936 ;; Record the file's truename, and maybe use that as visited name.
1944 ;; Set buffer's default directory to that of the file.
1946 ;; Turn off backup files for certain file names. Since
1947 ;; this is a permanent local, the major mode won't eliminate it.
1962 \f
1964 "Like `insert-file-contents', but only reads in the file literally.
1965 A buffer may be modified in several ways after reading into the buffer,
1966 to Emacs features such as format decoding, character code
1967 conversion, `find-file-hook', automatic uncompression, etc.
1969 This function ensures that none of these modifications will take place."
1977 nil))
1980 inhibit-file-name-handlers))
1993 filename)))
1994 ;; Check whether the file is uncommonly large
2005 "Insert contents of file FILENAME into buffer after point with no conversion.
2007 This function is meant for the user to run interactively.
2008 Don't call it from programs! Use `insert-file-contents-literally' instead.
2009 \(Its calling sequence is different; see its documentation)."
2014 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
2019 "Visit file FILENAME with no conversion of any kind.
2020 Format conversion and character code conversion are both disabled,
2021 and multibyte characters are disabled in the resulting buffer.
2022 The major mode used is Fundamental mode regardless of the file name,
2023 and local variable specifications in the file are ignored.
2024 Automatic uncompression and adding a newline at the end of the
2025 file due to `require-final-newline' is also disabled.
2027 You cannot absolutely rely on this function to result in
2028 visiting the file literally. If Emacs already has a buffer
2029 which is visiting the file, you get the existing buffer,
2030 regardless of whether it was created literally or not.
2032 In a Lisp program, if you want to be sure of accessing a file's
2033 contents literally, you should create a temporary buffer and then read
2034 the file contents into it using `insert-file-contents-literally'."
2037 "Find file literally: " nil default-directory
2040 \f
2044 after-find-file-from-revert-buffer
2045 nomodes)
2046 "Called after finding a file and by the default revert function.
2047 Sets buffer mode, parses local variables.
2048 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
2049 error in reading the file. WARN non-nil means warn if there
2050 exists an auto-save file more recent than the visited file.
2051 NOAUTO means don't mess with auto-save mode.
2052 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER non-nil
2053 means this call was from `revert-buffer'.
2054 Fifth arg NOMODES non-nil means don't alter the file's modes.
2055 Finishes by calling the functions in `find-file-hook'
2056 unless NOMODES is non-nil."
2059 nil
2069 ;; No need to warn if buffer is auto-saved
2070 ;; under the name of the visited file.
2072 auto-save-visited-file-name))
2075 buffer-file-name))
2095 ;; Make people do a little extra work (C-x C-q)
2096 ;; before altering a backup file.
2099 ;; When a file is marked read-only,
2100 ;; make the buffer read-only even if root is looking at it.
2108 ;; If requested, add a newline at the end of the file.
2118 view-read-only
2124 "Eval BODY and turn any error into a FORMAT message.
2125 FORMAT can have a %s escape which will be replaced with the actual error.
2126 If `debug-on-error' is set, errors are not caught, so that you can
2127 debug them.
2128 Avoid using a large BODY since it is duplicated."
2137 "Choose the major mode for this buffer automatically.
2138 Also sets up any specified local variables of the file.
2139 Uses the visited file name, the -*- line, and the local variables spec.
2141 This function is called automatically from `find-file'. In that case,
2142 we may set up the file-specified mode and local variables,
2143 depending on the value of `enable-local-variables'.
2144 In addition, if `local-enable-local-variables' is nil, we do
2145 not set local variables (though we do notice a mode specified with -*-.)
2147 `enable-local-variables' is ignored if you run `normal-mode' interactively,
2148 or from Lisp without specifying the optional argument FIND-FILE;
2149 in that case, this function acts as if `enable-local-variables' were t."
2157 ;; Turn font lock off and on, to make sure it takes account of
2158 ;; whatever file local variables are relevant to it.
2160 ;; Font-lock-mode (now in font-core.el) can be ON when
2161 ;; font-lock.el still hasn't been loaded.
2171 "Non-nil means to try second pass through `auto-mode-alist'.
2172 This means that if the first case-sensitive search through the alist fails
2173 to find a matching major mode, a second case-insensitive search is made.
2174 On systems with case-insensitive file names, this variable is ignored,
2175 since only a single case-insensitive search through the alist is made."
2181 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
2182 ;; c++-mode, java-mode and more) are added through autoload
2183 ;; directives in that file. That way is discouraged since it
2184 ;; spreads out the definition of the initial value.
2219 ;; Less common extensions come here
2220 ;; so more common ones above are found faster.
2260 ;; The list of archive file extensions should be in sync with
2261 ;; `auto-coding-alist' with `no-conversion' coding system.
2267 ;; Mailer puts message to be edited in
2268 ;; /tmp/Re.... or Message
2271 ;; some news reader is reported to use this
2280 ;; .emacs or .gnus or .viper following a directory delimiter in
2281 ;; Unix, MSDOG or VMS syntax.
2284 ;; _emacs following a directory delimiter
2285 ;; in MsDos syntax
2289 ;; Common Lisp ASDF package system.
2307 ;; Windows candidates may be opened case sensitively on Unix
2313 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
2315 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
2316 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
2317 ;; ChangeLog.old etc. Other change-log-mode entries are above;
2318 ;; this has lower priority to avoid matching changelog.sgml etc.
2320 ;; either user's dot-files or under /etc or some such
2322 ;; alas not all ~/.*rc files are like this
2323 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
2328 ;; this contains everything twice, with space and with colon :-(
2330 ;; Get rid of any trailing .n.m and try again.
2331 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
2332 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
2333 ;; Using mode nil rather than `ignore' would let the search continue
2334 ;; through this list (with the shortened name) rather than start over.
2336 ;; The following should come after the ChangeLog pattern
2337 ;; for the sake of ChangeLog.1, etc.
2338 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
2341 "Alist of filename patterns vs corresponding major mode functions.
2342 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
2343 \(NON-NIL stands for anything that is not nil; the value does not matter.)
2344 Visiting a file whose name matches REGEXP specifies FUNCTION as the
2345 mode function to use. FUNCTION will be called, unless it is nil.
2347 If the element has the form (REGEXP FUNCTION NON-NIL), then after
2348 calling FUNCTION (if it's not nil), we delete the suffix that matched
2349 REGEXP and search the list again for another match.
2351 If the file name matches `inhibit-first-line-modes-regexps',
2352 then `auto-mode-alist' is not processed.
2354 The extensions whose FUNCTION is `archive-mode' should also
2355 appear in `auto-coding-alist' with `no-conversion' coding system.
2357 See also `interpreter-mode-alist', which detects executable script modes
2358 based on the interpreters they specify to run,
2363 "Select Conf mode or XML mode according to start of file."
2373 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
2374 ;; and pike-mode) are added through autoload directives in that
2375 ;; file. That way is discouraged since it spreads out the
2376 ;; definition of the initial value.
2415 "Alist mapping interpreter names to major modes.
2416 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
2417 Each element looks like (INTERPRETER . MODE).
2418 If INTERPRETER matches the name of the interpreter specified in the first line
2419 of a script, mode MODE is enabled.
2427 "List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
2428 When checking `inhibit-first-line-modes-regexps', we first discard
2434 "Regexp matching interpreters, for file mode determination.
2435 This regular expression is matched against the first line of a file
2436 to determine the file's mode in `set-auto-mode'. If it matches, the file
2437 is assumed to be interpreted by the interpreter matched by the second group
2438 of the regular expression. The mode is then determined as the mode
2442 "Alist of buffer beginnings vs. corresponding major mode functions.
2443 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2444 After visiting a file, if REGEXP matches the text at the beginning of the
2445 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2446 call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
2447 major mode.
2449 If FUNCTION is nil, then it is not called. (That is a way of saying
2457 ;; The < comes before the groups (but the first) to reduce backtracking.
2458 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
2459 ;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
2463 comment-re "*"
2466 . html-mode)
2468 ;; These two must come after html, because they are more general:
2473 . sgml-mode)
2476 "Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
2477 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2478 After visiting a file, if REGEXP matches the text at the beginning of the
2479 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2480 call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
2481 have not specified a mode for this file.
2487 "Upper limit on `magic-mode-alist' regexp matches.
2491 "Select major mode appropriate for current buffer.
2493 To find the right major mode, this function checks for a -*- mode tag,
2494 checks if it uses an interpreter listed in `interpreter-mode-alist',
2495 matches the buffer beginning against `magic-mode-alist',
2496 compares the filename against the entries in `auto-mode-alist',
2497 then matches the buffer beginning against `magic-fallback-mode-alist'.
2499 It does not check for the `mode:' local variable in the
2500 Local Variables section of the file; for that, use `hack-local-variables'.
2502 If `enable-local-variables' is nil, this function does not check for a
2503 -*- mode tag.
2505 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2506 set the major mode only if that would change it. In other words
2507 we don't actually set it to the same mode the buffer already has."
2508 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2510 ;; Find a -*- mode tag
2517 ;; Find all specifications for the `mode:' variable
2518 ;; and execute them left to right.
2530 modes)))
2531 ;; Simple -*-MODE-*- case.
2534 modes))))
2535 ;; If we found modes to use, invoke them now, outside the save-excursion.
2543 ;; continuing would call minor modes again, toggling them off
2545 ;; If we didn't, look for an interpreter specified in the first line.
2546 ;; As a special case, allow for things like "#!/bin/env perl", which
2547 ;; finds the interpreter anywhere in $PATH.
2554 ;; Map interpreter name to a mode, signalling we're done at the
2555 ;; same time.
2557 interpreter-mode-alist))
2558 ;; If we found an interpreter mode to use, invoke it now.
2561 ;; Next try matching the buffer beginning against magic-mode-alist.
2575 ;; Next compare the filename against the entries in auto-mode-alist.
2580 ;; Remove remote file name identification.
2584 ;; Remove backup-suffixes from file name.
2587 ;; Find first matching alist entry.
2590 ;; System is case-insensitive.
2594 ;; System is case-sensitive.
2596 ;; First match case-sensitively.
2600 ;; Fallback to case-insensitive match.
2614 ;; Next try matching the buffer beginning against magic-fallback-mode-alist.
2629 ;; When `keep-mode-if-same' is set, we are working on behalf of
2630 ;; set-visited-file-name. In that case, if the major mode specified is the
2631 ;; same one we already have, don't actually reset it. We don't want to lose
2632 ;; minor modes such as Font Lock.
2634 "Apply MODE and return it.
2635 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2636 any aliases and compared to current major mode. If they are the
2637 same, do nothing and return nil."
2643 mode)))
2646 "Find the -*- spec in the buffer.
2647 Call with point at the place to start searching from.
2648 If one is found, set point to the beginning
2649 and return the position of the end.
2650 Otherwise, return nil; point may be changed."
2653 ;; Don't look for -*- if this file name matches any
2654 ;; of the regexps in inhibit-first-line-modes-regexps.
2662 sufs)
2670 ;; If the file begins with "#!"
2671 ;; (exec interpreter magic), look
2672 ;; for mode frobs in the first two
2673 ;; lines. You cannot necessarily
2674 ;; put them in the first line of
2675 ;; such a file without screwing up
2676 ;; the interpreter invocation.
2677 ;; The same holds for
2678 ;; '\"
2679 ;; in man pages (preprocessor
2680 ;; magic for the `man' program).
2691 end))))
2692 \f
2693 ;;; Handling file local variables
2697 file-local-variables-alist dir-local-variables-alist)
2702 "Normal hook run after processing a file's local variables specs.
2703 Major modes can use this to examine user-specified local variables
2707 "List variable-value pairs that are considered safe.
2708 Each element is a cons cell (VAR . VAL), where VAR is a variable
2709 symbol and VAL is a value that is considered safe."
2710 :risky t
2717 "Expressions that are considered safe in an `eval:' local variable.
2718 Add expressions to this list if you want Emacs to evaluate them, when
2719 they appear in an `eval' local variable specification, without first
2720 asking you for confirmation."
2721 :risky t
2726 ;; Risky local variables:
2729 buffer-auto-save-file-name
2730 buffer-file-name
2731 buffer-file-truename
2732 buffer-undo-list
2733 debugger
2734 default-text-properties
2735 eval
2736 exec-directory
2737 exec-path
2738 file-name-handler-alist
2739 frame-title-format
2740 global-mode-string
2741 header-line-format
2742 icon-title-format
2743 inhibit-quit
2744 load-path
2745 max-lisp-eval-depth
2746 max-specpdl-size
2747 minor-mode-map-alist
2748 minor-mode-overriding-map-alist
2749 mode-line-format
2750 mode-name
2751 overriding-local-map
2752 overriding-terminal-local-map
2753 process-environment
2754 standard-input
2755 standard-output
2756 unread-command-events))
2758 ;; Safe local variables:
2759 ;;
2760 ;; For variables defined by major modes, the safety declarations can go into
2761 ;; the major mode's file, since that will be loaded before file variables are
2762 ;; processed.
2763 ;;
2764 ;; For variables defined by minor modes, put the safety declarations in the
2765 ;; file defining the minor mode after the defcustom/defvar using an autoload
2766 ;; cookie, e.g.:
2767 ;;
2768 ;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
2769 ;;
2770 ;; Otherwise, when Emacs visits a file specifying that local variable, the
2771 ;; minor mode file may not be loaded yet.
2772 ;;
2773 ;; For variables defined in the C source code the declaration should go here:
2793 "Alist of file-local variable settings in the current buffer.
2794 Each element in this list has the form (VAR . VALUE), where VAR
2795 is a file-local variable (a symbol) and VALUE is the value
2796 specified. The actual value in the buffer may differ from VALUE,
2801 "Alist of directory-local variable settings in the current buffer.
2802 Each element in this list has the form (VAR . VALUE), where VAR
2803 is a directory-local variable (a symbol) and VALUE is the value
2804 specified in .dir-locals.el. The actual value in the buffer
2805 may differ from VALUE, if it is changed by the major or minor modes,
2810 "Normal hook run before setting file-local variables.
2811 It is called after checking for unsafe/risky variables and
2812 setting `file-local-variables-alist', and before applying the
2813 variables stored in `file-local-variables-alist'. A hook
2814 function is allowed to change the contents of this alist.
2816 This hook is called only if there is at least one file-local
2820 "Get confirmation before setting up local variable values.
2821 ALL-VARS is the list of all variables to be set up.
2822 UNSAFE-VARS is the list of those that aren't marked as safe or risky.
2823 RISKY-VARS is the list of those that are marked as risky.
2824 DIR-NAME is a directory name if these settings come from
2825 directory-local variables, or nil otherwise."
2827 nil
2833 prompt char)
2843 ", and variables that are risky (**)."
2850 y -- to apply the local variables list.
2854 ! -- to apply the local variables list, and permanently mark these
2866 ;; Make strings with embedded whitespace easier to read.
2874 ""
2881 done)
2890 ;; read-event returns -1 if we are in a kbd
2891 ;; macro and there are no more events in the
2892 ;; macro. In that case, attempt to get an
2893 ;; event interactively.
2901 ;; When this is called from desktop-restore-file-buffer,
2902 ;; coding-system-for-read may be non-nil. Reset it before
2903 ;; writing to .emacs.
2907 'safe-local-variable-values
2908 safe-local-variable-values))))
2915 "Return local variables specified in the -*- line.
2916 Ignore any specification for `mode:' and `coding:';
2917 `set-auto-mode' should already have handled `mode:',
2918 `set-auto-coding' should already have handled `coding:'.
2920 If MODE-ONLY is non-nil, all we do is check whether the major
2921 mode is specified, returning t if it is specified. Otherwise,
2922 return an alist of elements (VAR . VAL), where VAR is a variable
2923 and VAL is the specified value."
2927 result mode-specified)
2928 ;; Parse the -*- line into the RESULT alist.
2929 ;; Also set MODE-SPECIFIED if we see a spec or `mode'.
2931 nil)
2933 ;; Simple form: "-*- MODENAME -*-". Already handled.
2935 nil)
2937 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
2938 ;; (last ";" is optional).
2943 ;; There used to be a downcase here,
2944 ;; but the manual didn't say so,
2945 ;; and people want to set var names that aren't all lc.
2951 ;; It is traditional to ignore
2952 ;; case when checking for `mode' in set-auto-mode,
2953 ;; so we must do that here as well.
2954 ;; That is inconsistent, but we're stuck with it.
2955 ;; The same can be said for `coding' in set-auto-coding.
2961 'eval
2968 mode-specified
2969 result))))
2972 "Filter local variable settings, querying the user if necessary.
2973 VARIABLES is the alist of variable-value settings. This alist is
2974 filtered based on the values of `ignored-local-variables',
2975 `enable-local-eval', `enable-local-variables', and (if necessary)
2976 user interaction. The results are added to
2977 `file-local-variables-alist', without applying them.
2978 DIR-NAME is a directory name if these settings come from
2979 directory-local variables, or nil otherwise."
2980 ;; Find those variables that we may want to save to
2981 ;; `safe-local-variable-values'.
2987 ;; Ignore any variable in `ignored-local-variables'.
2988 nil)
2989 ;; Obey `enable-local-eval'.
2997 ;; Ignore duplicates (except `mode') in the present list.
2999 ;; Accept known-safe variables.
3003 ;; The variable is either risky or unsafe:
3010 ;; Query, unless all vars are safe or user wants no querying.
3016 risky-vars dir-name))
3027 "Parse and put into effect this buffer's local variables spec.
3028 If MODE-ONLY is non-nil, all we do is check whether the major mode
3029 is specified, returning t if it is specified."
3032 result)
3039 ;; Look for "Local variables:" line in last page.
3047 ;; suffix is what comes after "local variables:" in its line.
3048 ;; prefix is what comes before "local variables:" in its line.
3058 beg)
3062 endpos
3068 nil t))
3069 ;; This used to be an error, but really all it means is
3070 ;; that this may simply not be a local-variables section,
3071 ;; so just ignore it.
3081 ;; Discard the prefix.
3086 ;; Discard the suffix.
3094 ;; Find the variable name; strip whitespace.
3103 val)
3104 ;; Read the variable value.
3115 'eval
3120 ;; Now we've read all the local variables.
3121 ;; If MODE-ONLY is non-nil, return whether the mode was specified.
3123 ;; Otherwise, set the variables.
3130 ;; Any 'evals must run in the Right sequence.
3139 "Non-nil if SYM is safe as a file-local variable with value VAL.
3140 It is safe if any of these conditions are met:
3142 * There is a matching entry (SYM . VAL) in the
3143 `safe-local-variable-values' user option.
3145 * The `safe-local-variable' property of SYM is a function that
3146 evaluates to a non-nil value with VAL as an argument."
3152 "Non-nil if SYM could be dangerous as a file-local variable.
3153 It is dangerous if either of these conditions are met:
3155 * Its `risky-local-variable' property is non-nil.
3161 ;; If this is an alias, check the base name.
3181 "Return t if it is safe to eval EXP when it is found in a file."
3183 ;; Detect certain `put' expressions.
3190 lisp-indent-function
3191 scheme-indent-function))
3192 ;; Only allow safe values (not functions).
3197 ;; Only allow indirect form specs.
3198 ;; During bootstrapping, edebug-basic-spec might not be
3199 ;; defined yet.
3203 ;; Allow expressions that the user requested.
3205 ;; Certain functions can be allowed with safe arguments
3206 ;; or can specify verification functions to try.
3214 ok))
3222 ok)))))))
3225 "Set local variable VAR with value VAL.
3226 If VAR is `mode', call `VAL-mode' as a function unless it's
3227 already the major mode."
3234 ;; A minor mode must be passed an argument.
3235 ;; Otherwise, if the user enables the minor mode in a
3236 ;; major mode hook, this would toggle it off.
3242 ;; Make sure the string has no text properties.
3243 ;; Some text properties can get evaluated in various ways,
3244 ;; so it is risky to put them on with a local variable list.
3248 \f
3249 ;;; Handling directory-local variables, aka project settings.
3255 "List of cached directory roots for directory-local variable classes.
3256 Each element in this list has the form (DIR CLASS MTIME).
3257 DIR is the name of the directory.
3258 CLASS is the name of a variable class (a symbol).
3259 MTIME is the recorded modification time of the directory-local
3260 variables file associated with this entry. This time is a list
3261 of two integers (the same format as `file-attributes'), and is
3262 used to test whether the cache entry is still valid.
3263 Alternatively, MTIME can be nil, which means the entry is always
3267 "Return the variable list for CLASS."
3271 "Collect directory-local variables from MODE-VARIABLES.
3272 VARIABLES is the initial list of variables.
3273 Returns the new list."
3278 ;; If variables are specified more than once, only use the last. (Why?)
3279 ;; The pseudo-variables mode and eval are different (bug#3430).
3282 ;; Need a new cons in case we setcdr later.
3286 "Collect entries from CLASS-VARIABLES into VARIABLES.
3287 ROOT is the root directory of the project.
3288 Return the new variables list."
3296 ;; Don't include this in the previous condition, because we
3297 ;; want to filter all strings before the next condition.
3309 "Declare that the DIRECTORY root is an instance of CLASS.
3310 DIRECTORY is the name of a directory, a string.
3311 CLASS is the name of a project class, a symbol.
3312 MTIME is either the modification time of the directory-local
3313 variables file that defined this class, or nil.
3315 When a file beneath DIRECTORY is visited, the mode-specific
3316 variables from CLASS are applied to the buffer. The variables
3317 for a class are defined using `dir-locals-set-class-variables'."
3324 "Map the type CLASS to a list of variable settings.
3325 CLASS is the project class, a symbol. VARIABLES is a list
3326 that declares directory-local variables for the class.
3327 An element in VARIABLES is either of the form:
3328 (MAJOR-MODE . ALIST)
3329 or
3330 (DIRECTORY . LIST)
3332 In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
3333 whose elements are of the form (VARIABLE . VALUE).
3335 In the second form, DIRECTORY is a directory name (a string), and
3336 LIST is a list of the form accepted by the function.
3338 When a file is visited, the file's class is found. A directory
3339 may be assigned a class using `dir-locals-set-directory-class'.
3340 Then variables are set in the file's buffer according to the
3341 class' LIST. The list is processed in order.
3343 * If the element is of the form (MAJOR-MODE . ALIST), and the
3344 buffer's major mode is derived from MAJOR-MODE (as determined
3345 by `derived-mode-p'), then all the variables in ALIST are
3346 applied. A MAJOR-MODE of nil may be used to match any buffer.
3347 `make-local-variable' is called for each variable before it is
3348 set.
3350 * If the element is of the form (DIRECTORY . LIST), and DIRECTORY
3351 is an initial substring of the file's directory, then LIST is
3352 applied by recursively following these rules."
3359 "File that contains directory-local variables.
3360 It has to be constant to enforce uniform values
3364 "Find the directory-local variables for FILE.
3365 This searches upward in the directory tree from FILE.
3366 If the directory root of FILE has been registered in
3367 `dir-locals-directory-cache' and the directory-local variables
3368 file has not been modified, return the matching entry in
3369 `dir-locals-directory-cache'.
3370 Otherwise, if a directory-local variables file is found, return
3371 the file name.
3372 Otherwise, return nil."
3377 dir-locals-file))
3380 ;; `locate-dominating-file' may have abbreviated the name.
3383 ;; Find the best cached value in `dir-locals-directory-cache'.
3396 ;; Check the validity of the cache.
3401 ;; This cache entry is OK.
3402 dir-elt
3403 ;; This cache entry is invalid; clear it.
3406 locals-file)
3407 locals-file))))
3410 "Load a variables FILE and register a new class and instance.
3411 FILE is the name of the file holding the variables to apply.
3412 The new class name is the same as the directory in which FILE
3413 is found. Returns the new class name."
3423 class-name)))
3426 "Read per-directory local variables for the current buffer.
3427 Store the directory-local variables in `dir-local-variables-alist'
3428 and `file-local-variables-alist', without applying them."
3431 ;; Find the variables file.
3437 (setq dir-name (if (buffer-file-name) (file-name-directory (buffer-file-name)) default-directory))
3458 \f
3461 However, the mode will not be changed if
3462 \(1) a local variables list or the `-*-' line specifies a major mode, or
3464 \ not suitable for ordinary files, or
3465 \(3) the new file name does not particularly specify any mode."
3470 "Change name of file visited in current buffer to FILENAME.
3471 This also renames the buffer to correspond to the new file.
3472 The next time the buffer is saved it will go in the newly specified file.
3473 FILENAME nil or an empty string means mark buffer as not visiting any file.
3474 Remember to delete the initial contents of the minibuffer
3475 if you wish to pass an empty string as the argument.
3477 The optional second argument NO-QUERY, if non-nil, inhibits asking for
3478 confirmation in the case where another buffer is already visiting FILENAME.
3480 The optional third argument ALONG-WITH-FILE, if non-nil, means that
3481 the old visited file has been renamed to the new name FILENAME."
3489 nil
3504 filename)))
3514 ;; If new-name == old-name, renaming would add a spurious <2>
3515 ;; and it's considered as a feature in rename-buffer.
3521 ;; Abbreviate the file names of the buffer.
3530 nil)))
3531 ;; write-file-functions is normally used for things like ftp-find-file
3532 ;; that visit things that are not local files as if they were files.
3533 ;; Changing to visit an ordinary local file instead should flush the hook.
3538 ;; If buffer was read-only because of version control,
3539 ;; that reason is gone now, so make it writable.
3543 ;; Turn off backup files for certain file names.
3544 ;; Since this is a permanent local, the major mode won't eliminate it.
3546 backup-enable-predicate
3552 ;; If auto-save was not already on, turn it on if appropriate.
3556 ;; If auto save is on, start using a new name.
3557 ;; We deliberately don't rename or delete the old auto save
3558 ;; for the old visited file name. This is because perhaps
3559 ;; the user wants to save the new state and then compare with the
3560 ;; previous state from the auto save file.
3563 ;; Rename the old auto save file if any.
3570 ;; Update the major mode, if the file name determines it.
3572 ;; Don't change the mode if it is special.
3575 ;; Don't change the mode if the local variable list specifies it.
3581 "Write current buffer into file FILENAME.
3582 This makes the buffer visit that file, and marks it as not modified.
3584 If you specify just a directory name as FILENAME, that means to use
3585 the default file name but in that directory. You can also yank
3586 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
3588 If the buffer is not already visiting a file, the default file name
3589 for the output file is the buffer name.
3591 If optional second arg CONFIRM is non-nil, this function
3592 asks for confirmation before overwriting an existing file.
3593 Interactively, confirmation is required unless you supply a prefix argument."
3594 ;; (interactive "FWrite file: ")
3598 nil nil nil nil)
3602 default-directory)
3603 nil nil))
3607 ;; If arg is just a directory,
3608 ;; use the default file name, but in that directory.
3619 ;; Make buffer writable if file is writable.
3624 ;; It's likely that the VC status at the new location is different from
3625 ;; the one at the old location.
3627 \f
3629 "Make a backup of the disk file visited by the current buffer, if appropriate.
3630 This is normally done before saving the buffer the first time.
3632 A backup may be done by renaming or by copying; see documentation of
3633 variable `make-backup-files'. If it's done by renaming, then the file is
3634 no longer accessible under its old name.
3636 The value is non-nil after a backup was made by renaming.
3637 It has the form (MODES SELINUXCONTEXT BACKUPNAME).
3638 MODES is the result of `file-modes' on the original
3639 file; this means that the caller, after saving the buffer, should change
3640 the modes of the new file to agree with the old modes.
3641 SELINUXCONTEXT is the result of `file-selinux-context' on the original
3642 file; this means that the caller, after saving the buffer, should change
3643 the SELinux context of the new file to agree with the old context.
3644 BACKUPNAME is the backup file name, which is the old file renamed."
3651 backup-info backupname targets setmodes)
3652 ;; If specified name is a symbolic link, chase it to the target.
3653 ;; Thus we make the backups in the directory where the real file is.
3658 ;; (if (file-directory-p buffer-file-name)
3659 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
3663 ;; If have old versions to maybe delete,
3664 ;; ask the user to confirm now, before doing anything.
3665 ;; But don't actually delete til later.
3670 real-file-name)))))
3673 ;; Actually write the back up file.
3676 ; (file-symlink-p buffer-file-name)
3677 backup-by-copying
3678 ;; Don't rename a suid or sgid file.
3693 ;; rename-file should delete old backup.
3697 ;; If trouble writing the backup, write it in ~.
3702 backupname)
3706 ;; Now delete the old versions, if desired.
3713 setmodes)
3720 ;; Create temp files with strict access rights. It's easy to
3721 ;; loosen them later, whereas it's impossible to close the
3722 ;; time-window of loose permissions otherwise.
3725 ;; Try to overwrite old backup first.
3733 nil)
3735 ;; The file was somehow created by someone else between
3736 ;; `delete-file' and `copy-file', so let's try again.
3737 ;; rms says "I think there is also a possible race
3738 ;; condition for making backup files" (emacs-devel 20070821).
3739 nil)))
3740 ;; Reset the umask.
3748 "Return file NAME sans backup versions or strings.
3749 This is a separate procedure so your site-init or startup file can
3750 redefine it.
3751 If the optional argument KEEP-BACKUP-VERSION is non-nil,
3752 we do not remove backup version numbers, only true file version numbers."
3764 "Return t if deleting FILE and rewriting it would preserve the owner."
3769 ;; Return t if the file doesn't exist, since it's true that no
3770 ;; information would be lost by an (attempted) delete and create.
3776 The extension, in a file name, is the part that follows the last `.',
3777 except that a leading `.', if any, doesn't count."
3780 directory)
3784 ;; Don't use expand-file-name here; if DIRECTORY is relative,
3785 ;; we don't want to expand it.
3788 filename))))
3792 The extension, in a file name, is the part that follows the last `.',
3793 excluding version numbers and backup suffixes,
3794 except that a leading `.', if any, doesn't count.
3795 Return nil for extensionless file names such as `foo'.
3796 Return the empty string for file names such as `foo.'.
3798 If PERIOD is non-nil, then the returned value includes the period
3799 that delimits the extension, and if FILENAME has no extension,
3810 "A function to use instead of the default `make-backup-file-name'.
3811 A value of nil gives the default `make-backup-file-name' behavior.
3813 This could be buffer-local to do something special for specific
3814 files. If you define it, you may need to change `backup-file-name-p'
3815 and `file-name-sans-versions' too.
3817 See also `backup-directory-alist'."
3823 "Alist of filename patterns and backup directory names.
3824 Each element looks like (REGEXP . DIRECTORY). Backups of files with
3825 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
3826 relative or absolute. If it is absolute, so that all matching files
3827 are backed up into the same directory, the file names in this
3828 directory will be the full name of the file backed up with all
3829 directory separators changed to `!' to prevent clashes. This will not
3830 work correctly if your filesystem truncates the resulting name.
3832 For the common case of all backups going into one directory, the alist
3834 directory name.
3836 If this variable is nil, or it fails to match a filename, the backup
3837 is made in the original file's directory.
3839 On MS-DOS filesystems without long names this variable is always
3840 ignored."
3846 "Default `backup-enable-predicate' function.
3847 Checks for files in `temporary-file-directory',
3848 `small-temporary-file-directory', and /tmp."
3851 ;; Directory is under temporary-file-directory.
3856 ;; Directory is under /tmp.
3861 0 nil
3863 ;; Directory is under small-temporary-file-directory.
3868 "Create the non-numeric backup file name for FILE.
3869 Normally this will just be the file's name with `~' appended.
3870 Customization hooks are provided as follows.
3872 If the variable `make-backup-file-name-function' is non-nil, its value
3873 should be a function which will be called with FILE as its argument;
3874 the resulting name is used.
3876 Otherwise a match for FILE is sought in `backup-directory-alist'; see
3877 the documentation of that variable. If the directory for the backup
3878 doesn't exist, it is created."
3892 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
3894 elt backup-directory abs-backup-directory)
3899 alist nil)))
3900 ;; If backup-directory is relative, it should be relative to the
3901 ;; file's directory. By expanding explicitly here, we avoid
3902 ;; depending on default-directory.
3911 abs-backup-directory nil))))
3913 file
3917 ;; Normalize DOSish file names: downcase the drive
3918 ;; letter, if any, and replace the leading "x:" with
3919 ;; "/drive_x".
3922 ;; Replace any invalid file-name characters (for the
3923 ;; case of backing up remote files).
3927 "drive_"
3930 ""
3933 ;; Make the name unique by substituting directory
3934 ;; separators. It may not really be worth bothering about
3935 ;; doubling `!'s in the original name...
3940 backup-directory))
3945 "Return non-nil if FILE is a backup file name (numeric or not).
3946 This is a separate function so you can redefine it for customization.
3947 You may need to redefine `file-name-sans-versions' as well."
3952 ;; This is used in various files.
3953 ;; The usage of backup-extract-version-start is not very clean,
3954 ;; but I can't see a good alternative, so as of now I am leaving it alone.
3956 "Given the name of a numeric backup file, FN, return the backup number.
3957 Uses the free variable `backup-extract-version-start', whose value should be
3958 the index in the name where the version number begins."
3965 "Find a file name for a backup file FN, and suggestions for deletions.
3966 Value is a list whose car is the name for the backup file
3967 and whose cdr is a list of old versions to consider deleting now.
3968 If the value is nil, don't make a backup.
3969 Uses `backup-directory-alist' in the same way as does
3970 `make-backup-file-name'."
3972 ;; Run a handler for this function so that ange-ftp can refuse to do it.
3976 ;; We don't support numbered backups on plain MS-DOS
3977 ;; when long file names are unavailable.
3987 possibilities deserve-versions-p versions)
3990 base-versions
3993 possibilities)
3994 #'<)
3999 kept-old-versions
4000 kept-new-versions
4007 ;; Delete nothing if there is overflow
4008 ;; in the number of versions to keep.
4014 v))))))))))
4017 "Return number of names file FILENAME has."
4020 ;; (defun file-relative-name (filename &optional directory)
4021 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4022 ;; This function returns a relative file name which is equivalent to FILENAME
4023 ;; when used with that default directory as the default.
4024 ;; If this is impossible (which can happen on MSDOS and Windows
4025 ;; when the file name and directory use different drive names)
4026 ;; then it returns FILENAME."
4027 ;; (save-match-data
4028 ;; (let ((fname (expand-file-name filename)))
4029 ;; (setq directory (file-name-as-directory
4030 ;; (expand-file-name (or directory default-directory))))
4031 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
4032 ;; ;; drive names, they can't be relative, so return the absolute name.
4033 ;; (if (and (or (eq system-type 'ms-dos)
4034 ;; (eq system-type 'cygwin)
4035 ;; (eq system-type 'windows-nt))
4036 ;; (not (string-equal (substring fname 0 2)
4037 ;; (substring directory 0 2))))
4038 ;; filename
4039 ;; (let ((ancestor ".")
4040 ;; (fname-dir (file-name-as-directory fname)))
4041 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
4042 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
4043 ;; (setq directory (file-name-directory (substring directory 0 -1))
4044 ;; ancestor (if (equal ancestor ".")
4045 ;; ".."
4046 ;; (concat "../" ancestor))))
4047 ;; ;; Now ancestor is empty, or .., or ../.., etc.
4048 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
4049 ;; ;; We matched within FNAME's directory part.
4050 ;; ;; Add the rest of FNAME onto ANCESTOR.
4051 ;; (let ((rest (substring fname (match-end 0))))
4052 ;; (if (and (equal ancestor ".")
4053 ;; (not (equal rest "")))
4054 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
4055 ;; rest
4056 ;; (concat (file-name-as-directory ancestor) rest)))
4057 ;; ;; We matched FNAME's directory equivalent.
4058 ;; ancestor))))))
4061 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4062 This function returns a relative file name which is equivalent to FILENAME
4063 when used with that default directory as the default.
4064 If FILENAME and DIRECTORY lie on different machines or on different drives
4065 on a DOS/Windows machine, it returns FILENAME in expanded form."
4069 default-directory))))
4075 ;; Test for different drives on DOS/Windows
4077 ;; Should `cygwin' really be included here? --stef
4080 ;; Test for different remote file system identification
4082 filename
4088 directory nil nil case-fold-search))
4090 directory nil nil case-fold-search))))
4093 ".."
4095 ;; Now ancestor is empty, or .., or ../.., etc.
4097 directory nil nil case-fold-search))
4098 ;; We matched within FILENAME's directory part.
4099 ;; Add the rest of FILENAME onto ANCESTOR.
4102 ;; But don't bother with ANCESTOR if it would give us `./'.
4103 rest
4105 ;; We matched FILENAME's directory equivalent.
4106 ancestor))))))
4107 \f
4109 "Save current buffer in visited file if modified.
4110 Variations are described below.
4112 By default, makes the previous version into a backup file
4113 if previously requested or if this is the first save.
4115 to become a backup when the next save is done.
4117 unconditionally makes the previous version into a backup file.
4119 to become a backup when the next save is done,
4120 and unconditionally makes the previous version into a backup file.
4122 With a numeric argument of 0, never make the previous version
4123 into a backup file.
4125 If a file's name is FOO, the names of its numbered backup versions are
4126 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
4127 Numeric backups (rather than FOO~) will be made if value of
4128 `version-control' is not the atom `never' and either there are already
4129 numeric versions of the file being backed up, or `version-control' is
4130 non-nil.
4131 We don't want excessive versions piling up, so there are variables
4132 `kept-old-versions', which tells Emacs how many oldest versions to keep,
4133 and `kept-new-versions', which tells how many newest versions to keep.
4134 Defaults are 2 old versions and 2 new.
4135 `dired-kept-versions' controls dired's clean-directory (.) command.
4136 If `delete-old-versions' is nil, system will query user
4137 before trimming versions. Otherwise it does it silently.
4139 If `vc-make-backup-files' is nil, which is the default,
4140 no backup files are made for files managed by version control.
4141 (This is because the version control system itself records previous versions.)
4143 See the subroutine `basic-save-buffer' for more information."
4149 ;; We used to display the message below only for files > 50KB, but
4150 ;; then Rmail-mbox never displays it due to buffer swapping. If
4151 ;; the test is ever re-introduced, be sure to handle saving of
4152 ;; Rmail files.
4159 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
4160 Normally delete only if the file was written by this Emacs since
4161 the last real save, but optional arg FORCE non-nil means delete anyway."
4175 "Normal hook that is run before a buffer is saved to its file."
4181 "Normal hook that is run after a buffer is saved to its file."
4187 "If non-nil, use this coding system for saving the buffer.
4188 More precisely, use this coding system in place of the
4189 value of `buffer-file-coding-system', when saving the buffer.
4190 Calling `write-region' for any purpose other than saving the buffer
4191 will still use `buffer-file-coding-system'; this variable has no effect
4198 "Save the current buffer in its visited file, if it has been modified.
4199 The hooks `write-contents-functions' and `write-file-functions' get a chance
4200 to do the job of saving; if they do not, then the buffer is saved in
4201 the visited file in the usual way.
4202 Before and after saving the buffer, this function runs
4203 `before-save-hook' and `after-save-hook', respectively."
4206 ;; In an indirect buffer, save its base buffer instead.
4211 setmodes)
4212 ;; If buffer has no file name, ask user for one.
4219 ;; Signal an error if the user specified the name of an
4220 ;; existing directory.
4223 filename))
4225 ;; Signal an error if the specified name refers to a
4226 ;; non-existing directory.
4256 ;; Support VC version backups.
4262 ;; If a hook returned t, file is already "written".
4263 ;; Otherwise, write it the usual way now.
4265 ;; Now we have saved the current buffer. Let's make sure
4266 ;; that buffer-file-coding-system is fixed to what
4267 ;; actually used for saving by binding it locally.
4279 ;; If the auto-save file was recent before this command,
4280 ;; delete it now.
4282 ;; Support VC `implicit' locking.
4287 ;; This does the "real job" of writing a buffer into its visited file
4288 ;; and making a backup file. This is what is normally done
4289 ;; but inhibited if one of write-file-functions returns non-nil.
4290 ;; It returns a value (MODES SELINUXCONTEXT BACKUPNAME), like backup-buffer.
4302 ;; This returns a value (MODES SELINUXCONTEXT BACKUPNAME), like backup-buffer.
4316 buffer-file-name)))
4330 ;; Write temp name, then rename it.
4331 ;; This requires write access to the containing dir,
4332 ;; which is why we don't try it if we don't have that access.
4334 tempname succeed
4337 ;; Create temp files with strict access rights. It's easy to
4338 ;; loosen them later, whereas it's impossible to close the
4339 ;; time-window of loose permissions otherwise.
4344 ;; Try various temporary names.
4345 ;; This code follows the example of make-temp-file,
4346 ;; but it calls write-region in the appropriate way
4347 ;; for saving the buffer.
4353 ;; Pass in nil&nil rather than point-min&max
4354 ;; cause we're saving the whole buffer.
4355 ;; write-region-annotate-functions may use it.
4357 tempname nil realname
4359 nil)
4361 ;; The file was somehow created by someone else between
4362 ;; `make-temp-name' and `write-region', let's try again.
4363 nil)
4365 ;; Reset the umask.
4367 ;; If we failed, restore the buffer's modtime.
4370 ;; Since we have created an entirely new file,
4371 ;; make sure it gets the right permission bits set.
4376 buffer-file-name)))
4377 ;; We succeeded in writing the temp file,
4378 ;; so rename it.
4380 ;; If file not writable, see if we can make it writable
4381 ;; temporarily while we write it.
4382 ;; But no need to do so if we have just backed it up
4383 ;; (setmodes is set) because that says we're superseding.
4385 ;; Change the mode back, after writing.
4388 buffer-file-name))
4394 ;; Pass in nil&nil rather than point-min&max to indicate
4395 ;; we're saving the buffer rather than just a region.
4396 ;; write-region-annotate-functions may make us of it.
4398 buffer-file-name nil t buffer-file-truename)
4400 ;; If we get an error writing the new file, and we made
4401 ;; the backup by renaming, undo the backing-up.
4406 setmodes))
4409 "View the differences between BUFFER and its associated file.
4410 This requires the external program `diff' to be in your `exec-path'."
4424 ;; Display that message for 1 second so that user can read it
4425 ;; in the minibuffer.
4427 ;; return always nil, so that save-buffers-kill-emacs will not move
4428 ;; over to the next unsaved buffer when calling `d'.
4429 nil)
4432 `((?\C-r
4439 ;; Return nil to ask about BUF again.
4440 nil)
4452 ;; Return nil to ask about BUF again.
4453 nil)
4463 "Save some modified file-visiting buffers. Asks user about each one.
4464 You can answer `y' to save, `n' not to save, `C-r' to look at the
4465 buffer in question with `view-buffer' before deciding or `d' to
4466 view the differences using `diff-buffer-with-file'.
4468 Optional argument (the prefix) non-nil means save all with no questions.
4469 Optional second argument PRED determines which buffers are considered:
4470 If PRED is nil, all the file-visiting buffers are considered.
4471 If PRED is t, then certain non-file buffers will also be considered.
4472 If PRED is a zero-argument function, it indicates for each buffer whether
4473 to consider it or not when called with that buffer current.
4475 See `save-some-buffers-action-alist' if you want to
4476 change the additional actions you can take on files."
4480 files-done abbrevs-done)
4482 ;; First save any buffers that we're supposed to save unconditionally.
4483 ;; That way the following code won't ask about them.
4488 ;; Ask about those buffers that merit it,
4489 ;; and record the number thus saved.
4493 ;; Note that killing some buffers may kill others via
4494 ;; hooks (e.g. Rmail and its viewing buffer).
4507 t
4519 save-some-buffers-action-alist))
4520 ;; Maybe to save abbrevs, and record whether
4521 ;; we either saved them or asked to.
4527 abbrev-file-name)))
4529 ;; Don't keep bothering user if he says no.
4534 "(Some special files were saved without asking)"
4536 \f
4538 "Mark current buffer as unmodified, not needing to be saved.
4541 It is not a good idea to use this function in Lisp programs, because it
4542 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
4549 "Change whether this buffer is read-only.
4550 With prefix argument ARG, make the buffer read-only if ARG is
4551 positive, otherwise make it writable. If buffer is read-only
4552 and `view-read-only' is non-nil, enter view mode."
4557 nil ; do nothing.
4558 ;; Toggle.
4565 ;; If view-mode is already active, `view-mode-enter' is a nop.
4577 "Insert contents of file FILENAME into buffer after point.
4578 Set mark after the inserted text.
4580 This function is meant for the user to run interactively.
4581 Don't call it from programs! Use `insert-file-contents' instead.
4582 \(Its calling sequence is different; see its documentation)."
4587 "Append the contents of the region to the end of file FILENAME.
4588 When called from a function, expects three arguments,
4589 START, END and FILENAME. START and END are normally buffer positions
4590 specifying the part of the buffer to write.
4591 If START is nil, that means to use the entire buffer contents.
4592 If START is a string, then output that string to the file
4593 instead of any buffer contents; END is ignored.
4595 This does character code conversion and applies annotations
4596 like `write-region' does."
4601 "Return most recent backup file for FILENAME or nil if no backups exist."
4602 ;; `make-backup-file-name' will get us the right directory for
4603 ;; ordinary or numeric backups. It might create a directory for
4604 ;; backups as a side-effect, according to `backup-directory-alist'.
4611 tem)
4620 newest))
4623 "Rename current buffer to a similar name not already taken.
4624 This function is useful for creating multiple shell process buffers
4625 or multiple mail buffers, etc."
4633 ;; If the existing buffer name has a <NNN>,
4634 ;; which isn't part of the file name (if any),
4635 ;; then get rid of that.
4641 "Create the directory DIR and optionally any nonexistent parent dirs.
4642 If DIR already exists as a directory, signal an error, unless
4643 PARENTS is non-nil.
4645 Interactively, the default choice of directory to create is the
4646 current buffer's default directory. That is useful when you have
4647 visited a file in a nonexistent directory.
4649 Noninteractively, the second (optional) argument PARENTS, if
4650 non-nil, says whether to create parent directories that don't
4651 exist. Interactively, this happens by default."
4654 nil nil)
4655 t))
4656 ;; If default-directory is a remote directory,
4657 ;; make sure we find its make-directory handler.
4665 create-list)
4667 ;; If directory is its own parent, then we can't
4668 ;; keep looping forever
4683 "Delete the directory named DIRECTORY. Does not follow symlinks.
4684 If RECURSIVE is non-nil, all files in DIRECTORY are deleted as well.
4685 TRASH non-nil means to trash the directory instead, provided
4686 `delete-by-moving-to-trash' is non-nil.
4688 When called interactively, TRASH is t if no prefix argument is
4689 given. With a prefix argument, TRASH is nil."
4696 "Move directory to trash: "
4698 default-directory default-directory nil nil))))
4704 nil)
4706 ;; If default-directory is a remote directory, make sure we find its
4707 ;; delete-directory handler.
4714 ;; Only move non-empty dir to trash if recursive deletion was
4715 ;; requested. This mimics the non-`delete-by-moving-to-trash'
4716 ;; case, where the operation fails in delete-directory-internal.
4717 ;; As `move-file-to-trash' trashes directories (empty or
4718 ;; otherwise) as a unit, we do not need to recurse here.
4720 ;; Check if directory is empty apart from "." and "..".
4725 ;; Otherwise, call outselves recursively if needed.
4729 ;; This test is equivalent to
4730 ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
4731 ;; but more efficient
4735 ;; We do not want to delete "." and "..".
4741 "Copy DIRECTORY to NEWNAME. Both args must be strings.
4742 If NEWNAME names an existing directory, copy DIRECTORY as subdirectory there.
4744 This function always sets the file modes of the output files to match
4745 the corresponding input file.
4747 The third arg KEEP-TIME non-nil means give the output files the same
4748 last-modified time as the old ones. (This works on only some systems.)
4750 A prefix arg makes KEEP-TIME non-nil.
4752 Noninteractively, the last argument PARENTS says whether to
4753 create parent directories if they don't exist. Interactively,
4754 this happens by default."
4761 default-directory default-directory nil nil)
4762 current-prefix-arg t)))
4763 ;; If default-directory is a remote directory, make sure we find its
4764 ;; copy-directory handler.
4770 ;; Compute target name.
4775 ;; Copy recursively.
4787 ;; We do not want to copy "." and "..".
4790 ;; Set directory attributes.
4794 \f
4797 "Function to use to revert this buffer, or nil to do the default.
4798 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
4803 "Function to use to insert contents when reverting this buffer.
4804 Gets two args, first the nominal file name to use,
4805 and second, t if reading the auto-save file.
4810 "Function to check whether a non-file buffer needs reverting.
4811 This should be a function with one optional argument NOCONFIRM.
4812 Auto Revert Mode passes t for NOCONFIRM. The function should return
4813 non-nil if the buffer should be reverted. A return value of
4814 `fast' means that the need for reverting was not checked, but
4815 that reverting the buffer is fast. The buffer is current when
4816 this function is called.
4818 The idea behind the NOCONFIRM argument is that it should be
4819 non-nil if the buffer is going to be reverted without asking the
4820 user. In such situations, one has to be careful with potentially
4821 time consuming operations.
4823 For more information on how this variable is used by Auto Revert mode,
4827 "Normal hook for `revert-buffer' to run before reverting.
4828 If `revert-buffer-function' is used to override the normal revert
4832 "Normal hook for `revert-buffer' to run after reverting.
4833 Note that the hook value that it runs is the value that was in effect
4834 before reverting; that makes a difference if you have buffer-local
4835 hook functions.
4837 If `revert-buffer-function' is used to override the normal revert
4843 "Replace current buffer text with the text of the visited file on disk.
4844 This undoes all changes since the file was visited or saved.
4845 With a prefix argument, offer to revert from latest auto-save file, if
4846 that is more recent than the visited file.
4848 This command also implements an interface for special buffers
4849 that contain text which doesn't come from a file, but reflects
4850 some other data instead (e.g. Dired buffers, `buffer-list'
4851 buffers). This is done via the variable `revert-buffer-function'.
4852 In these cases, it should reconstruct the buffer contents from the
4853 appropriate data.
4855 When called from Lisp, the first argument is IGNORE-AUTO; only offer
4856 to revert from the auto-save file when this is nil. Note that the
4857 sense of this argument is the reverse of the prefix argument, for the
4858 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
4859 to nil.
4861 Optional second argument NOCONFIRM means don't ask for confirmation
4862 at all. \(The variable `revert-without-query' offers another way to
4863 revert buffers without querying for confirmation.)
4865 Optional third argument PRESERVE-MODES non-nil means don't alter
4866 the files modes. Normally we reinitialize them using `normal-mode'.
4868 If the value of `revert-buffer-function' is non-nil, it is called to
4869 do all the work for this command. Otherwise, the hooks
4870 `before-revert-hook' and `after-revert-hook' are run at the beginning
4871 and the end, and if `revert-buffer-insert-file-contents-function' is
4872 non-nil, it is called instead of rereading visited file contents."
4874 ;; I admit it's odd to reverse the sense of the prefix argument, but
4875 ;; there is a lot of code out there which assumes that the first
4876 ;; argument should be t to avoid consulting the auto-save file, and
4877 ;; there's no straightforward way to encourage authors to notice a
4878 ;; reversal of the argument sense. So I'm just changing the user
4879 ;; interface, but leaving the programmatic interface the same.
4887 buffer-auto-save-file-name
4892 buffer-auto-save-file-name
4893 buffer-file-name)))
4903 file-name)))
4905 ;; If file was backed up but has changed since,
4906 ;; we should make another backup.
4910 ;; Effectively copy the after-revert-hook status,
4911 ;; since after-find-file will clobber it.
4914 after-revert-hook))
4919 ;; Get rid of all undo records for this buffer.
4921 ;; Don't make undo records for the reversion.
4924 file-name auto-save-p)))
4927 "File %s no longer exists!"
4929 file-name))
4932 "File %s no longer readable!"
4934 file-name))
4936 ;; Bind buffer-file-name to nil
4937 ;; so that we don't try to lock the file.
4943 ;; Auto-saved file should be read by Emacs'
4944 ;; internal coding.
4948 buffer-file-coding-system-explicit
4951 coding-system-for-read
4953 coding-system-for-read)
4955 ;; As a coding system suitable for multibyte
4956 ;; buffer is specified, make the current
4957 ;; buffer multibyte.
4960 ;; This force after-insert-file-set-coding
4961 ;; (called from insert-file-contents) to set
4962 ;; buffer-file-coding-system to a proper value.
4965 ;; Note that this preserves point in an intelligent way.
4969 nil nil t))
4971 nil nil t)))))
4972 ;; Recompute the truename in case changes in symlinks
4973 ;; have changed the truename.
4977 ;; Run after-revert-hook as it was before we reverted.
4981 local-hook)
4984 t))))))
4987 "Recover the visited file--get contents from its last auto-save file."
4992 "Visit file FILE, but get contents from its last auto-save file."
4993 ;; Actually putting the file name in the minibuffer should be used
4994 ;; only rarely.
4995 ;; Not just because users often use the default.
5015 ;; Use insert-directory-safely, not insert-directory,
5016 ;; because these files might not exist. In particular,
5017 ;; FILE might not exist if the auto-save file was for
5018 ;; a buffer that didn't visit a file, such as "*mail*".
5019 ;; The code in v20.x called `ls' directly, so we need
5020 ;; to emulate what `ls' did in that case.
5026 ;; Keep the current buffer-file-coding-system.
5028 ;; Auto-saved file should be read with special coding.
5037 "Recover auto save files from a previous Emacs session.
5038 This command first displays a Dired buffer showing you the
5039 previous sessions that you could recover from.
5040 To choose one, move point to the proper line and then type C-c C-c.
5041 Then you'll be asked about a number of files to recover."
5051 auto-save-list-file-prefix)))
5052 t)
5061 ;; Each line starts with a space
5062 ;; so that Font Lock mode won't highlight the first character.
5071 "Choose one saved session to recover auto-save files from.
5072 This command is used in the special Dired buffer created by
5075 ;; Get the name of the session file to recover from.
5077 files
5083 ;; Read in the auto-save-list file.
5086 ;; Loop thru the text of that file
5087 ;; and get out the names of the files to recover.
5091 ;; This is a pair of lines for a non-file-visiting buffer.
5092 ;; Get the auto-save file name and manufacture
5093 ;; a "visited file name" from that.
5096 ;; If there is no auto-save file name, the
5097 ;; auto-save-list file is probably corrupted.
5110 ;; This pair of lines is a file-visiting
5111 ;; buffer. Use the visited file name.
5121 ;; Ignore a file if its auto-save file does not exist now.
5125 ;; The file contains a pair of line for each auto-saved buffer.
5126 ;; The first line of the pair contains the visited file name
5127 ;; or is empty if the buffer was not visiting a file.
5128 ;; The second line is the auto-save file name.
5136 files
5142 "Kill BUFFER if confirmed."
5150 "Kill some buffers. Asks the user whether to kill each one of them.
5151 Non-interactively, if optional argument LIST is non-nil, it
5152 specifies the list of buffers to kill, asking for approval for each one."
5160 ; if we killed the base buffer.
5167 "Kill buffers whose name matches the specified REGEXP.
5168 The optional second argument indicates whether to kill internal buffers too."
5177 \f
5179 "Adjust current buffer's auto save file name for current conditions.
5180 Also rename any existing auto save file, if it was made in this session."
5192 "Return file name to use for auto-saves of current buffer.
5193 Does not consider `auto-save-visited-file-name' as that variable is checked
5194 before calling this function. You can redefine this for customization.
5195 See also `auto-save-file-name-p'."
5203 result uniq)
5204 ;; Apply user-specified translations
5205 ;; to the file name.
5209 filename)
5219 filename))))
5224 ;; We truncate the file name to DOS 8+3 limits
5225 ;; before doing anything else, because the regexp
5226 ;; passed to string-match below cannot handle
5227 ;; extensions longer than 3 characters, multiple
5228 ;; dots, and other atrocities.
5233 fn)
5238 "#"
5241 ;; Make sure auto-save file names don't contain characters
5242 ;; invalid for the underlying filesystem.
5244 ;; Don't modify remote (ange-ftp) filenames
5247 result))))
5249 ;; Deal with buffers that don't have any associated files. (Mail
5250 ;; mode tends to create a good number of these.)
5254 file-name)
5255 ;; Restrict the characters used in the file name to those which
5256 ;; are known to be safe on all filesystems, url-encoding the
5257 ;; rest.
5258 ;; We do this on all platforms, because even if we are not
5259 ;; running on DOS/Windows, the current directory may be on a
5260 ;; mounted VFAT filesystem, such as a USB memory stick.
5264 ;; For multibyte characters, this will produce more than
5265 ;; 2 hex digits, so is not true URL encoding.
5269 ;; Generate the file name.
5275 ;; Try a few alternative directories, to get one we can
5276 ;; write it.
5282 ;; Don't modify remote (ange-ftp) filenames
5284 ;; The call to convert-standard-filename is in case
5285 ;; buffer-name includes characters not allowed by the
5286 ;; DOS/Windows filesystems. make-temp-file writes to the
5287 ;; file it creates, so we must fix the file name _before_
5288 ;; make-temp-file is called.
5290 fname))
5292 ;; make-temp-file creates the file,
5293 ;; but we don't want it to exist until we do an auto-save.
5297 file-name)))
5300 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
5301 FILENAME should lack slashes. You can redefine this for customization."
5303 \f
5305 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
5306 The generated regexp will match a filename only if the filename
5307 matches that wildcard according to shell rules. Only wildcards known
5308 by `sh' are supported."
5310 ;; Copy the initial run of non-special characters.
5313 ;; If no special characters, we're almost done.
5317 j)
5319 result
5340 ;; Found "[^". Insert a `\0' character
5341 ;; (which cannot happen in a filename)
5342 ;; into the character class, so that `^'
5343 ;; is not the first character after `[',
5344 ;; and thus non-special in a regexp.
5349 ;; I don't think `]' can appear in a
5350 ;; character class in a wildcard, but
5351 ;; let's be general here.
5358 i
5371 ;; Shell wildcards should match the entire filename,
5372 ;; not its part. Make the regexp say so.
5374 \f
5377 "Switches for `list-directory' to pass to `ls' for brief listing."
5383 "Switches for `list-directory' to pass to `ls' for verbose listing."
5388 "Expand wildcard pattern PATTERN.
5389 This returns a list of file names which match the pattern.
5391 If PATTERN is written as an absolute file name,
5392 the values are absolute also.
5394 If PATTERN is written as a relative file name, it is interpreted
5395 relative to the current default directory, `default-directory'.
5396 The file names returned are normally also relative to the current
5397 default directory. However, if FULL is non-nil, they are absolute."
5401 ;; A list of all dirs that DIRPART specifies.
5402 ;; This can be more than one dir
5403 ;; if DIRPART contains wildcards.
5407 dirpart)))
5411 contents)
5416 ;; Filter out "." and ".."
5421 name))
5428 this-dir-contents)
5429 this-dir-contents)
5430 contents))))
5432 contents)))
5434 ;; Let Tramp know that `file-expand-wildcards' does not need an advice.
5438 "Display a list of files in or matching DIRNAME, a la `ls'.
5439 DIRNAME is globbed by the shell if necessary.
5440 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
5441 Actions controlled by variables `list-directory-brief-switches'
5442 and `list-directory-verbose-switches'."
5446 nil default-directory nil)
5447 pfx)))
5449 list-directory-brief-switches))
5450 buffer)
5462 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
5470 "Quote characters special to the shell in PATTERN, leave wildcards alone.
5472 PATTERN is assumed to represent a file-name wildcard suitable for the
5473 underlying filesystem. For Unix and GNU/Linux, each character from the
5475 the parts of the pattern which don't include wildcard characters are
5476 quoted with double quotes.
5479 on Windows), so PATTERN can use them to quote wildcard characters that
5480 need to be passed verbatim to shell commands."
5484 ;; DOS/Windows don't allow `"' in file names. So if the
5485 ;; argument has quotes, we can safely assume it is already
5486 ;; quoted by the caller.
5488 ;; We quote [&()#$'] in case their shell is a port of a
5489 ;; Unixy shell. We quote [,=+] because stock DOS and
5490 ;; Windows shells require that in some cases, such as
5491 ;; passing arguments to batch files that use positional
5492 ;; arguments like %1.
5494 pattern
5497 end)
5514 pattern))))
5521 "Program to get the amount of free space on a file system.
5522 We assume the output has the format of `df'.
5523 The value of this variable must be just a command name or file name;
5524 if you want to specify options, use `directory-free-space-args'.
5526 A value of nil disables this feature.
5528 If the function `file-system-info' is defined, it is always used in
5529 preference to the program given by this variable."
5535 "Options to use when running `directory-free-space-program'."
5540 "Return the amount of free space on directory DIR's file system.
5541 The result is a string that gives the number of free 1KB blocks,
5542 or nil if the system call or the program which retrieve the information
5543 fail. It returns also nil when DIR is a remote directory.
5545 This function calls `file-system-info' if it is available, or invokes the
5546 program specified by `directory-free-space-program' if that is non-nil."
5548 ;; Try to find the number of free blocks. Non-Posix systems don't
5549 ;; always have df, but might have an equivalent system call.
5558 ;; Avoid failure if the default directory does
5559 ;; not exist (Bug#2631, Bug#3911).
5562 nil t nil
5563 directory-free-space-args
5564 dir)
5566 ;; Usual format is a header line followed by a line of
5567 ;; numbers.
5572 ;; Move to the end of the "available blocks" number.
5575 ;; Copy it into AVAILABLE.
5580 ;; The following expression replaces `dired-move-to-filename-regexp'.
5584 ;; In some locales, month abbreviations are as short as 2 letters,
5585 ;; and they can be followed by ".".
5586 ;; In Breton, a month name can include a quote character.
5599 s "+"
5602 ;; Japanese MS-Windows ls-lisp has one-digit months, and
5603 ;; omits the Kanji characters after month and day-of-month.
5604 ;; On Mac OS X 10.3, the date format in East Asian locales is
5605 ;; day-of-month digits followed by month digits.
5611 ;; The "[0-9]" below requires the previous column to end in a digit.
5612 ;; This avoids recognizing `1 may 1997' as a date in the line:
5613 ;; -r--r--r-- 1 may 1997 1168 Oct 19 16:49 README
5615 ;; The "[BkKMGTPEZY]?" below supports "ls -alh" output.
5617 ;; For non-iso date formats, we add the ".*" in order to find
5618 ;; the last possible match. This avoids recognizing
5619 ;; `jservice 10 1024' as a date in the line:
5620 ;; drwxr-xr-x 3 jservice 10 1024 Jul 2 1997 esg-host
5622 ;; vc dired listings provide the state or blanks between file
5623 ;; permissions and date. The state is always surrounded by
5624 ;; parantheses:
5625 ;; -rw-r--r-- (modified) 2005-10-22 21:25 files.el
5626 ;; This is not supported yet.
5631 "Regular expression to match up to the file name in a directory listing.
5632 The default value is designed to recognize dates and times
5637 ;; insert-directory
5638 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
5639 ;; FULL-DIRECTORY-P is nil.
5640 ;; The single line of output must display FILE's name as it was
5641 ;; given, namely, an absolute path name.
5642 ;; - must insert exactly one line for each file if WILDCARD or
5643 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
5644 ;; before the file lines, plus optional text after the file lines.
5645 ;; Lines are delimited by "\n", so filenames containing "\n" are not
5646 ;; allowed.
5647 ;; File lines should display the basename.
5648 ;; - must be consistent with
5649 ;; - functions dired-move-to-filename, (these two define what a file line is)
5650 ;; dired-move-to-end-of-filename,
5651 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
5652 ;; dired-insert-headerline
5653 ;; dired-after-subdir-garbage (defines what a "total" line is)
5654 ;; - variable dired-subdir-regexp
5655 ;; - may be passed "--dired" as the first argument in SWITCHES.
5656 ;; Filename handlers might have to remove this switch if their
5657 ;; "ls" command does not support it.
5659 "Insert directory listing for FILE, formatted according to SWITCHES.
5660 Leaves point after the inserted text.
5661 SWITCHES may be a string of options, or a list of strings
5662 representing individual options.
5663 Optional third arg WILDCARD means treat FILE as shell wildcard.
5664 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
5665 switches do not contain `d', so that a full listing is expected.
5667 This works by running a directory listing program
5668 whose name is in the variable `insert-directory-program'.
5669 If WILDCARD, it also runs the shell specified by `shell-file-name'.
5671 When SWITCHES contains the long `--dired' option, this function
5672 treats it specially, for the sake of dired. However, the
5673 normally equivalent short `-D' option is just passed on to
5674 `insert-directory-program', as any other option."
5675 ;; We need the directory in order to find the right handler.
5680 wildcard full-directory-p)
5683 ;; Read the actual directory using `insert-directory-program'.
5684 ;; RESULT gets the status code.
5686 ;; putting text property `dired-filename, decode one
5687 ;; bunch by one to preserve that property.
5689 ;; This is to control encoding the arguments in call-process.
5693 default-file-name-coding-system))))
5696 ;; Run ls in the directory part of the file pattern
5697 ;; using the last component as argument.
5704 shell-file-name nil t nil
5705 "-c"
5707 ""
5709 insert-directory-program
5710 " -d "
5712 switches
5714 " -- "
5715 ;; Quote some characters that have
5716 ;; special meanings in shells; but
5717 ;; don't quote the wildcards--we want
5718 ;; them to be special. We also
5719 ;; currently don't quote the quoting
5720 ;; characters in case people want to
5721 ;; use them explicitly to quote
5722 ;; wildcard characters.
5724 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
5725 ;; directory if FILE is a symbolic link.
5732 insert-directory-program nil t nil
5736 ;; Split the switches at any spaces so we can
5737 ;; pass separate options as separate args.
5739 ;; Avoid lossage if FILE starts with `-'.
5747 file))))))))
5749 ;; If we got "//DIRED//" in the output, it means we got a real
5750 ;; directory listing, even if `ls' returned nonzero.
5751 ;; So ignore any errors.
5764 ;; The first time ls returns an error,
5765 ;; find the version numbers of ls,
5766 ;; and set insert-directory-ls-version
5767 ;; to > if it is more than 5.2.1, < if it is less, nil if it
5768 ;; is equal or if the info cannot be obtained.
5769 ;; (That can mean it isn't GNU ls.)
5779 comparison)
5795 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
5799 ;; If `insert-directory-program' failed, signal an error.
5801 ;; Delete the error message it may have output.
5803 ;; On non-Posix systems, we cannot open a directory, so
5804 ;; don't even try, because that will always result in
5805 ;; the ubiquitous "Access denied". Instead, show the
5806 ;; command line so the user can try to guess what went wrong.
5811 insert-directory-program
5813 file result)
5814 ;; Unix. Access the file to get a suitable error.
5821 ;; The following overshoots by one line for an empty
5822 ;; directory listed with "--dired", but without "-a"
5823 ;; switch, where the ls output contains a
5824 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
5825 ;; We take care of that case later.
5833 error-lines)
5834 ;; Find all the lines that are error messages,
5835 ;; and record the bounds of each one.
5842 ;; Now read the numeric positions of file names.
5849 error-lines))
5852 error-lines)))
5854 ;; End is followed by \n or by " -> ".
5856 ;; It seems that we can't trust ls's output as to
5857 ;; byte positions of filenames.
5863 ;; Take care of the case where the ls output contains a
5864 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
5865 ;; and we went one line too far back (see above).
5870 ;; Now decode what read if necessary.
5872 file-name-coding-system
5873 default-file-name-coding-system
5875 coding-no-eol
5876 val pos)
5880 ;; If no coding system is specified or detection is
5881 ;; requested, detect the coding.
5895 ;; Force no eol conversion on a file name, so
5896 ;; that CR is preserved.
5904 ;; Try to insert the amount of free space.
5907 ;; First find the line to put it on.
5911 ;; Replace "total" with "used", to avoid confusion.
5917 "Convert `ls --dired' file name position value POS to a buffer position.
5918 File name position values returned in ls --dired output
5919 count only stdout; they don't count the error messages sent to stderr.
5920 So this function converts to them to real buffer positions.
5921 ERROR-LINES is a list of buffer positions of error message lines,
5922 of the form (START END)."
5926 pos)
5930 "Insert directory listing for FILE, formatted according to SWITCHES.
5932 Like `insert-directory', but if FILE does not exist, it inserts a
5933 message to that effect instead of signaling an error."
5936 ;; Simulate the message printed by `ls'.
5940 "Functions to call with no arguments to query about killing Emacs.
5941 If any of these functions returns nil, killing Emacs is cancelled.
5942 `save-buffers-kill-emacs' calls these functions, but `kill-emacs',
5946 "How to ask for confirmation when leaving Emacs.
5947 If nil, the default, don't ask at all. If the value is non-nil, it should
5948 be a predicate function such as `yes-or-no-p'."
5956 "Offer to save each buffer, then kill this Emacs process.
5957 With prefix ARG, silently save all file-visiting buffers, then kill."
5966 ;; process-list is not defined on MSDOS.
5968 active)
5977 ;; Query the user for other things, perhaps.
5984 "Offer to save each buffer, then kill the current connection.
5985 If the current frame has no client, kill Emacs itself.
5987 With prefix ARG, silently save all file-visiting buffers, then kill.
5989 If emacsclient was started with a list of filenames to edit, then
5990 only these files will be asked to be saved."
5995 \f
5996 ;; We use /: as a prefix to "quote" a file name
5997 ;; so that magic file name handlers will not apply to it.
6001 file-name-handler-alist))
6003 ;; We depend on being the last handler on the list,
6004 ;; so that anything else which does need handling
6005 ;; has been handled already.
6006 ;; So it is safe for us to inhibit *all* magic file name handlers.
6015 default-directory))
6016 ;; Get a list of the indices of the args which are file names.
6019 ;; The first six are special because they
6020 ;; return a file name. We want to include the /:
6021 ;; in the return value.
6022 ;; So just avoid stripping it in the first place.
6029 ;; `identity' means just return the first arg
6030 ;; not stripped of its quoting.
6032 ;; `add' means add "/:" to the result.
6034 ;; `quote' means add "/:" to buffer-file-name.
6036 ;; `unquote-then-quote' means set buffer-file-name
6037 ;; temporarily to unquoted filename.
6039 ;; List the arguments which are filenames.
6047 ;; For all other operations, treat the first argument only
6048 ;; as the file name.
6050 method
6051 ;; Copy ARGUMENTS so we can replace elements in it.
6055 ;; Strip off the /: from the file names that have it.
6063 "/"
6079 res))
6082 \f
6083 ;; Symbolic modes and read-file-modes.
6086 "Convert CHAR to a numeric bit-mask for extracting mode bits.
6087 CHAR is in [ugoa] and represents the category of users (Owner, Group,
6088 Others, or All) for whom to produce the mask.
6089 The bit-mask that is returned extracts from mode bits the access rights
6090 for the specified category of users."
6098 "Convert CHAR to a numeric value of mode bits.
6099 CHAR is in [rwxXstugo] and represents symbolic access permissions.
6100 If CHAR is in [Xugo], the value is taken from FROM (or 0 if omitted)."
6107 ;; Rights relative to the previous file modes.
6118 "Convert a symbolic mode string specification to an equivalent number.
6120 WHO-MASK is the bit-mask specifying the category of users to which to
6121 apply the access permissions. See `file-modes-char-to-who'.
6122 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6123 RIGHTS request to add, remove, or set permissions based on existing ones,
6130 char-right)
6137 num-rights
6141 op char-right)))
6142 num-rights))
6145 "Convert symbolic file modes to numeric file modes.
6146 MODES is the string to convert, it should match
6149 notation.
6150 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6151 MODES request to add, remove, or set permissions based on existing ones,
6165 num-who num-modes)
6168 num-modes)))
6171 "Read file modes in octal or symbolic notation and return its numeric value.
6172 PROMPT is used as the prompt, default to `File modes (octal or symbolic): '.
6173 ORIG-FILE is the name of a file on whose mode bits to base returned
6174 permissions if what user types requests to add, remove, or set permissions
6190 nil nil default)))
6196 \f
6197 ;; Trashcan handling.
6199 "Directory for `move-file-to-trash' to move files and directories to.
6200 This directory is only used when the function `system-move-file-to-trash'
6201 is not defined.
6202 Relative paths are interpreted relative to `default-directory'.
6203 If the value is nil, Emacs uses a freedesktop.org-style trashcan."
6213 "Move the file (or directory) named FILENAME to the trash.
6214 When `delete-by-moving-to-trash' is non-nil, this function is
6215 called by `delete-file' and `delete-directory' instead of
6216 deleting files outright.
6218 If the function `system-move-file-to-trash' is defined, call it
6219 with FILENAME as an argument.
6220 Otherwise, if `trash-directory' is non-nil, move FILENAME to that
6221 directory.
6222 Otherwise, trash FILENAME using the freedesktop.org conventions,
6223 like the GNOME, KDE and XFCE desktop environments. Emacs only
6227 ;; If `trash-directory' is non-nil, move the file there.
6231 trash-dir)))
6232 ;; We can't trash a parent directory of trash-directory.
6235 trash-dir filename))
6238 ;; Ensure that the trashed file-name is unique.
6245 ;; If `system-move-file-to-trash' is defined, use it.
6248 ;; Otherwise, use the freedesktop.org method, as specified at
6249 ;; http://freedesktop.org/wiki/Specifications/trash-spec
6260 ;; Check if we have permissions to delete.
6264 ;; The trashed file cannot be the trash dir or its parent.
6267 trash-files-dir filename))
6270 trash-info-dir filename))
6272 ;; Ensure that the trash directory exists; otherwise, create it.
6281 ;; Try to move to trash with .trashinfo undo information
6286 ;; Perform url-encoding on FN. For compatibility with
6287 ;; other programs (e.g. XFCE Thunar), allow literal "/"
6288 ;; for path separators.
6293 ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A
6294 ?B ?C ?D ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O
6307 fn))
6312 ;; Attempt to make .trashinfo file, trying up to 5
6313 ;; times. The .trashinfo file is opened with O_EXCL,
6314 ;; as per trash-spec 0.7, even if that can be a problem
6315 ;; on old NFS versions...
6319 trash-files-dir))
6321 success info-fn)
6326 trash-info-dir))
6334 ;; Uniqify new-fn. (Some file managers do not
6335 ;; like Emacs-style backup file names---e.g. bug
6336 ;; 170956 in Konqueror bug tracker.)
6341 ;; Finally, try to move the file to the trashcan.
6345 \f
6370 ;; arch-tag: bc68d3ea-19ca-468b-aac6-3a4a7766101f
6371 ;;; files.el ends here