| blob | d0cbc2cc417cbd8969068b82b465accc14d33fa5 |
1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985, 86, 87, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001
4 ;;; Free Software Foundation, Inc.
6 ;; Maintainer: FSF
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
25 ;;; Commentary:
27 ;; Defines most of Emacs's file- and directory-handling functions,
28 ;; including basic file visiting, backup generation, link handling,
29 ;; ITS-id version control, load- and write-hook handling, and the like.
31 ;;; Code:
34 "Backups of edited data files."
38 "Finding files."
43 "*Non-nil means delete auto-save file when a buffer is saved or killed.
45 Note that auto-save file will not be deleted if the buffer is killed
46 when it has unsaved changes."
51 nil
52 "*Alist of abbreviations for file directories.
53 A list of elements of the form (FROM . TO), each meaning to replace
54 FROM with TO when it appears in a directory name. This replacement is
55 done when setting up the default directory of a newly visited file.
56 *Every* FROM string should start with `^'.
58 Do not use `~' in the TO strings.
59 They should be ordinary absolute directory names.
61 Use this feature when you have directories which you normally refer to
62 via absolute symbolic links. Make TO the name of the link, and FROM
63 the name it is linked to."
71 ;; Turn off backup files on VMS since it has version numbers.
73 "*Non-nil means make a backup of a file the first time it is saved.
74 This can be done by renaming the file or by copying.
76 Renaming means that Emacs renames the existing file so that it is a
77 backup file, then writes the buffer into a new file. Any other names
78 that the old file had will now refer to the backup file. The new file
79 is owned by you and its group is defaulted.
81 Copying means that Emacs copies the existing file into the backup
82 file, then writes the buffer on top of the existing file. Any other
83 names that the old file had will now refer to the new (edited) file.
84 The file's owner and group are unchanged.
86 The choice of renaming or copying is controlled by the variables
87 `backup-by-copying', `backup-by-copying-when-linked',
88 `backup-by-copying-when-mismatch' and
89 `backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
93 ;; Do this so that local variables based on the file name
94 ;; are not overridden by the major mode.
96 "Non-nil means don't make a backup, regardless of the other parameters.
97 This variable is intended for use by making it local to a buffer.
102 "*Non-nil means always use copying to create backup files.
103 See documentation of variable `make-backup-files'."
108 "*Non-nil means use copying to create backups for files with multiple names.
109 This causes the alternate names to refer to the latest version as edited.
110 This variable is relevant only if `backup-by-copying' is nil."
115 "*Non-nil means create backups by copying if this preserves owner or group.
116 Renaming may still be used (subject to control of other variables)
117 when it would not result in changing the owner or group of the file;
118 that is, for files which are owned by you and whose group matches
119 the default for a new file created there by you.
120 This variable is relevant only if `backup-by-copying' is nil."
125 "*Non-nil means create backups by copying to preserve a privileged owner.
126 Renaming may still be used (subject to control of other variables)
127 when it would not result in changing the owner of the file or if the owner
128 has a user id greater than the value of this variable. This is useful
129 when low-numbered uid's are used for special system users (such as root)
130 that must maintain ownership of certain files.
131 This variable is relevant only if `backup-by-copying' and
132 `backup-by-copying-when-mismatch' are nil."
137 "Default `backup-enable-predicate' function.
138 Checks for files in `temporary-file-directory' or
139 `small-temporary-file-directory'."
142 ;; Directory is under temporary-file-directory.
147 0 nil
149 ;; Directory is under small-temporary-file-directory.
154 "Predicate that looks at a file name and decides whether to make backups.
158 "*Non-nil in a buffer means always offer to save buffer on exit.
159 Do so even if the buffer is not visiting a file.
160 Automatically local in all buffers."
166 "*Non-nil means find a file under alternative names, in existing buffers.
167 This means if any existing buffer is visiting the file you want
168 under another name, you get the existing buffer instead of a new buffer."
173 "*Non-nil means visit a file under its truename.
174 The truename of a file is found by chasing all links
175 both at the file level and at the levels of the containing directories."
180 nil
181 "*Specify which files should be reverted without query.
182 The value is a list of regular expressions.
183 If the file name matches one of these regular expressions,
184 then `revert-buffer' reverts the file without querying
185 if the file has changed on disk and you have not edited the buffer."
190 "The device number and file number of the file visited in the current buffer.
191 The value is a list of the form (FILENUM DEVNUM).
192 This pair of numbers uniquely identifies the file.
214 "*Non-nil means protect against I/O errors while saving files.
215 Some modes set this non-nil in particular buffers.
217 This feature works by writing the new contents into a temporary file
218 and then renaming the temporary file to replace the original.
219 In this way, any I/O error in writing leaves the original untouched,
220 and there is never any instant where the file is nonexistent.
222 Note that this feature forces backups to be made by copying.
223 Yet, at the same time, saving a precious file
224 breaks any hard links between it and other files."
229 "*Control use of version numbers for backup files.
230 t means make numeric backup versions unconditionally.
231 nil means make them for files that have some already.
232 `never' means do not make them."
240 "*When cleaning directory, number of versions to keep."
246 "*If t, delete excess backup versions silently.
247 If nil, ask confirmation. Any other value prevents any trimming."
254 "*Number of oldest versions to keep when a new numbered backup is made."
259 "*Number of newest versions to keep when a new numbered backup is made.
260 Includes the new backup. Must be > 0"
265 "*Value of t says silently ensure a file ends in a newline when it is saved.
266 Non-nil but not t says ask user whether to add a newline when there isn't one.
267 nil means don't add newlines."
274 "*Non-nil says by default do auto-saving of every file-visiting buffer."
279 "*Non-nil says auto-save a buffer in the file it is visiting, when practical.
280 Normally auto-save files are written under other names."
286 "*Transforms to apply to buffer file name before making auto-save file name.
287 Each transform is a list (REGEXP REPLACEMENT):
288 REGEXP is a regular expression to match against the file name.
289 If it matches, `replace-match' is used to replace the
290 matching part with REPLACEMENT.
291 All the transforms in the list are tried, in the order they are listed.
292 When one transform applies, its result is final;
293 no further transforms are tried.
295 The default value is set up to put the auto-save file into `/tmp'
296 for editing a remote file."
302 "*Non-nil means save word abbrevs too when files are saved.
303 Loading an abbrev file sets this to t."
308 "*Non-nil means allow `find-file' to visit directories.
309 To visit the directory, `find-file' runs `find-directory-functions'."
314 "*List of functions to try in sequence to visit a directory.
315 Each function is called with the directory name as the sole argument
316 and should return either a buffer or nil."
320 ;;;It is not useful to make this a local variable.
321 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
323 "List of functions to be called for `find-file' on nonexistent file.
324 These functions are called as soon as the error is detected.
325 Variable `buffer-file-name' is already set up.
328 ;;;It is not useful to make this a local variable.
329 ;;;(put 'find-file-hooks 'permanent-local t)
331 "List of functions to be called after a buffer is loaded from a file.
332 The buffer's local variables (if any) will have been processed before the
336 "List of functions to be called before writing out a buffer to a file.
337 If one of them returns non-nil, the file is considered already written
338 and the rest are not called.
339 These hooks are considered to pertain to the visited file.
340 So any buffer-local binding of `write-file-hooks' is
343 Don't make this variable buffer-local; instead, use `local-write-file-hooks'.
345 ;;; However, in case someone does make it local...
349 "Just like `write-file-hooks', except intended for per-buffer use.
350 The functions in this list are called before the ones in
351 `write-file-hooks'.
353 This variable is meant to be used for hooks that have to do with a
354 particular visited file. Therefore, it is a permanent local, so that
355 changing the major mode does not clear it. However, calling
361 "List of functions to be called before writing out a buffer to a file.
362 If one of them returns non-nil, the file is considered already written
363 and the rest are not called.
365 This variable is meant to be used for hooks that pertain to the
366 buffer's contents, not to the particular visited file; thus,
367 `set-visited-file-name' does not clear this variable; but changing the
368 major mode does clear it.
370 This variable automatically becomes buffer-local whenever it is set.
371 If you use `add-hook' to add elements to the list, use nil for the
372 LOCAL argument.
378 "*Control use of local variables in files you visit.
379 The value can be t, nil or something else.
380 A value of t means file local variables specifications are obeyed;
381 nil means they are ignored; anything else means query.
382 This variable also controls use of major modes specified in
383 a -*- line.
386 always obeys file local variable specifications and the -*- line,
387 and ignores this variable."
394 "Like `enable-local-variables' but meant for buffer-local bindings.
395 The meaningful values are nil and non-nil. The default is non-nil.
396 If a major mode sets this to nil, buffer-locally, then any local
397 variables list in the file will be ignored.
399 This variable does not affect the use of major modes
404 The value can be t, nil or something else.
405 A value of t means obey `eval' variables;
406 nil means ignore them; anything else means query.
409 and ignores this variable."
415 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
438 "The directory for writing small temporary files.
439 If non-nil, this directory is used instead of `temporary-file-directory'
440 by programs that create small temporary files. This is for systems that
443 ;; The system null device. (Should reference NULL_DEVICE from C.)
447 "Provides support for ange-ftp host name completion.
448 Runs the usual ange-ftp hook, but only for completion operations."
449 ;; Having this here avoids the need to load ange-ftp when it's not
450 ;; really in use.
456 inhibit-file-name-handlers)))
461 "Convert a standard file's name to something suitable for the current OS.
462 This function's standard definition is trivial; it just returns the argument.
463 However, on some systems, the function is redefined with a definition
464 that really does change some file names to canonicalize certain
465 patterns and to guarantee valid names."
466 filename)
467 \f
469 "Show the current default directory."
474 "Value of the CDPATH environment variable, as a list.
478 "Explode a colon-separated search path into a list of directory names.
479 \(For values of `colon' equal to `path-separator'.)"
480 ;; We could use split-string here.
488 nil
493 cd-list)))
496 "Change current directory to given absolute file name DIR."
497 ;; Put the name into directory syntax now,
498 ;; because otherwise expand-file-name may give some bad results.
511 "Make DIR become the current buffer's default directory.
512 If your environment includes a `CDPATH' variable, try each one of that
513 colon-separated list of directories when resolving a relative directory name."
516 default-directory default-directory
532 cd-path)
533 nil))
537 "Load the Lisp file named FILE."
538 ;; This is a case where .elc makes a lot of sense.
545 "Load the library named LIBRARY.
546 This is an interface to the function `load'."
551 "Copy the file FILE into a temporary file on this machine.
552 Returns the name of the local copy, or nil, if FILE is directly
553 accessible."
554 ;; This formerly had an optional BUFFER argument that wasn't used by
555 ;; anything.
559 nil)))
562 "Return the truename of FILENAME, which should be absolute.
563 The truename of a file name is found by chasing symbolic links
564 both at the level of the file and at the level of the directories
565 containing it, until no links are left at any level.
567 The arguments COUNTER and PREV-DIRS are used only in recursive calls.
568 Do not specify them in other calls."
569 ;; COUNTER can be a cons cell whose car is the count of how many more links
570 ;; to chase before getting an error.
571 ;; PREV-DIRS can be a cons cell whose car is an alist
572 ;; of truenames we've just recently computed.
574 ;; The last test looks dubious, maybe `+' is meant here? --simon.
584 ;; For speed, remove the ange-ftp completion handler from the list.
585 ;; We know it's not needed here.
586 ;; For even more speed, do this only on the outermost call.
593 ;; andrewi@harlequin.co.uk - none of the following code (except for
594 ;; invoking the file-name handler) currently applies on Windows
595 ;; (ie. there are no native symlinks), but there is an issue with
596 ;; case differences being ignored by the OS, and short "8.3 DOS"
597 ;; name aliases existing for all files. (The short names are not
598 ;; reported by directory-files, but can be used to refer to files.)
599 ;; It seems appropriate for file-truename to resolve these issues in
600 ;; the most natural way, which on Windows is to call the function
601 ;; `w32-long-file-name' - this returns the exact name of a file as
602 ;; it is stored on disk (expanding short name aliases with the full
603 ;; name in the process).
606 newname)
607 ;; For file name that has a special handler, call handler.
608 ;; This is so that ange-ftp can save time by doing a no-op.
611 ;; If filename contains a wildcard, newname will be the old name.
614 ;; If filename doesn't exist, newname will be nil.
619 ;; If this file directly leads to a link, process that iteratively
620 ;; so that we don't use lots of stack.
626 ;; For file name that has a special handler, call handler.
627 ;; This is so that ange-ftp can save time by doing a no-op.
630 done t)
632 target dirfile)
633 ;; Get the truename of the directory.
635 ;; If these are equal, we have the (or a) root directory.
637 ;; If this is the same dir we last got the truename for,
638 ;; save time--don't recalculate.
648 done t)
651 done t)
652 ;; Put it back on the file name.
654 ;; Is the file name the name of a link?
657 ;; Yes => chase that link, then start all over
658 ;; since the link may point to a directory name that uses links.
659 ;; We can't safely use expand-file-name here
660 ;; since target might look like foo/../bar where foo
661 ;; is itself a link. Instead, we handle . and .. above.
664 target
666 done nil)
667 ;; No, we are done!
669 filename))
672 "Chase links in FILENAME until a name that is not a link.
673 Does not examine containing directories for links,
674 unlike `file-truename'."
680 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
683 ;; Handle `..' by hand, since it needs to work in the
684 ;; target of any directory symlink.
685 ;; This code is not quite complete; it does not handle
686 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
690 ;; Chase links in the default dir of the symlink.
694 ;; Now find the parent of that dir.
698 newname))
699 \f
701 "Select buffer BUFFER in another window.
702 Optional second arg NORECORD non-nil means
703 do not put this buffer at the front of the list of recently selected ones.
705 This uses the function `display-buffer' as a subroutine; see its
706 documentation for additional customization information."
712 "Switch to buffer BUFFER in another frame.
713 Optional second arg NORECORD non-nil means
714 do not put this buffer at the front of the list of recently selected ones.
716 This uses the function `display-buffer' as a subroutine; see its
717 documentation for additional customization information."
724 "Edit file FILENAME.
725 Switch to a buffer visiting file FILENAME,
726 creating one if none already exists.
727 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
728 expand wildcards (if any) and visit multiple files. Wildcard expansion
729 can be suppressed by setting `find-file-wildcards'."
737 "Edit file FILENAME, in another window.
738 May create a new window, or reuse an existing one.
739 See the function `display-buffer'.
740 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
741 expand wildcards (if any) and visit multiple files."
752 "Edit file FILENAME, in another frame.
753 May create a new frame, or reuse an existing one.
754 See the function `display-buffer'.
755 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
756 expand wildcards (if any) and visit multiple files."
767 "Edit file FILENAME but don't allow changes.
768 Like `find-file' but marks buffer as read-only.
776 "Edit file FILENAME in another window but don't allow changes.
785 "Edit file FILENAME in another frame but don't allow changes.
794 "Find file FILENAME as a replacement for the file in the next window.
795 This command does not select that window."
814 "Find file FILENAME, select its buffer, kill previous buffer.
815 If the current buffer now contains an empty file that you just visited
816 \(presumably by mistake), use this command to visit the file you really want."
827 ;; (not buffer-read-only)
854 \f
856 "Create a suitably named buffer for visiting FILENAME, and return it.
857 FILENAME (sans directory) is used unchanged if that name is free;
858 otherwise a string <2> or <3> or ... is appended to get an unused name."
865 "Create and return a buffer with a name based on NAME.
866 Choose the buffer's name using `generate-new-buffer-name'."
870 "Regexp to match the automounter prefix in a directory name."
878 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
881 ;; Get rid of the prefixes added by the automounter.
888 ;; If any elt of directory-abbrev-alist matches this name,
889 ;; abbreviate accordingly.
895 ;; Compute and save the abbreviated homedir name.
896 ;; We defer computing this until the first time it's needed, to
897 ;; give time for directory-abbrev-alist to be set properly.
898 ;; We include a slash at the end, to avoid spurious matches
899 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
906 ;; If FILENAME starts with the abbreviated homedir,
907 ;; make it start with `~' instead.
909 ;; If the home dir is just /, don't change it.
912 ;; MS-DOS root directories can come with a drive letter;
913 ;; Novell Netware allows drive letters beyond `Z:'.
922 filename))
925 "*List of logical names for which visiting shouldn't save the true dirname.
926 On VMS, when you visit a file using a logical name that searches a path,
927 you may or may not want the visited file name to record the specific
928 directory where the file was found. If you *do not* want that, add the logical
929 name to this list as a string."
934 "Return the buffer visiting file FILENAME (a string).
935 This is like `get-file-buffer', except that it checks for any buffer
936 visiting the same file, possibly under a different name.
937 If there is no such live buffer, return nil."
949 found)
954 number
959 ;; Verify this buffer's file number
960 ;; still belongs to its file.
963 attributes))
966 found))))
967 \f
969 "*Non-nil means file-visiting commands should handle wildcards.
970 For example, if you specify `*.c', that would visit all the files
971 whose names match the pattern."
977 "*Non-nil means suppress warning messages for symlinked files.
978 When nil, Emacs prints a warning when visiting a file that is already
979 visited, but with a different name. Setting this option to t
980 suppresses this warning."
986 "Read file FILENAME into a buffer and return the buffer.
987 If a buffer exists visiting FILENAME, return that one, but
988 verify that the file has not changed since visited or saved.
989 The buffer is not selected, just returned to the caller.
990 Optional first arg NOWARN non-nil means suppress any warning messages.
991 Optional second arg RAWFILE non-nil means the file is read literally.
992 Optional third arg WILDCARDS non-nil means do wildcard processing
993 and visit all the matching files. When wildcards are actually
994 used and expanded, the value is a list of buffers
995 that are visiting the various files."
1002 'find-directory-functions
1005 filename)))
1008 find-file-wildcards
1021 ;; Find any buffer for a file which has same truename.
1023 ;; Let user know if there is a buffer with the same truename.
1027 find-file-suppress-same-file-warnings
1031 ;; Optionally also find that buffer.
1035 ;; We are using an existing buffer.
1041 ;; Certain files should be reverted automatically
1042 ;; if they have changed on disk and not in the buffer.
1050 found))
1060 "File %s changed on disk. Discard your edits? "
1065 "File %s changed on disk. Discard your edits in %s? "
1076 "Save file and revisit literally? "
1081 rawfile truename number))
1083 "Discard your edits and revisit file literally? "
1086 rawfile truename number)
1090 "Revisit file literally? "
1093 rawfile truename number)
1096 ;; Return the buffer we are using.
1097 buf)
1098 ;; Create a new buffer.
1101 ;; find-file-noselect-1 may use a different buffer.
1103 rawfile truename number))))))
1107 error)
1110 ;; Needed in case we are re-visiting the file with a different
1111 ;; text representation.
1125 filename)))
1126 ;; Unconditionally set error
1135 filename)))
1136 ;; Run find-file-not-found-hooks until one returns non-nil.
1138 ;; If they fail too, set error.
1140 ;; Record the file's truename, and maybe use that as visited name.
1146 ;; On VMS, we may want to remember which directory in a search list
1147 ;; the file was found in.
1159 ;; Set buffer's default directory to that of the file.
1161 ;; Turn off backup files for certain file names. Since
1162 ;; this is a permanent local, the major mode won't eliminate it.
1175 \f
1177 "Like `insert-file-contents', but only reads in the file literally.
1178 A buffer may be modified in several ways after reading into the buffer,
1179 to Emacs features such as format decoding, character code
1180 conversion, `find-file-hooks', automatic uncompression, etc.
1182 This function ensures that none of these modifications will take place."
1190 nil))
1202 "Insert contents of file FILENAME into buffer after point with no conversion.
1204 This function is meant for the user to run interactively.
1205 Don't call it from programs! Use `insert-file-contents-literally' instead.
1206 \(Its calling sequence is different; see its documentation)."
1210 filename)))
1215 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
1220 "Visit file FILENAME with no conversion of any kind.
1221 Format conversion and character code conversion are both disabled,
1222 and multibyte characters are disabled in the resulting buffer.
1223 The major mode used is Fundamental mode regardless of the file name,
1224 and local variable specifications in the file are ignored.
1225 Automatic uncompression and adding a newline at the end of the
1226 file due to `require-final-newline' is also disabled.
1228 You cannot absolutely rely on this function to result in
1229 visiting the file literally. If Emacs already has a buffer
1230 which is visiting the file, you get the existing buffer,
1231 regardless of whether it was created literally or not.
1233 In a Lisp program, if you want to be sure of accessing a file's
1234 contents literally, you should create a temporary buffer and then read
1235 the file contents into it using `insert-file-contents-literally'."
1238 \f
1242 after-find-file-from-revert-buffer
1243 nomodes)
1244 "Called after finding a file and by the default revert function.
1245 Sets buffer mode, parses local variables.
1246 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
1247 error in reading the file. WARN non-nil means warn if there
1248 exists an auto-save file more recent than the visited file.
1249 NOAUTO means don't mess with auto-save mode.
1250 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER non-nil
1251 means this call was from `revert-buffer'.
1252 Fifth arg NOMODES non-nil means don't alter the file's modes.
1253 Finishes by calling the functions in `find-file-hooks'
1254 unless NOMODES is non-nil."
1257 nil
1267 ;; No need to warn if buffer is auto-saved
1268 ;; under the name of the visited file.
1270 auto-save-visited-file-name))
1273 buffer-file-name))
1287 (if (file-exists-p (file-name-directory (directory-file-name (file-name-directory buffer-file-name))))
1288 "Use M-x make-directory RET RET to create the directory"
1295 ;; Make people do a little extra work (C-x C-q)
1296 ;; before altering a backup file.
1304 view-read-only
1310 "Choose the major mode for this buffer automatically.
1311 Also sets up any specified local variables of the file.
1312 Uses the visited file name, the -*- line, and the local variables spec.
1314 This function is called automatically from `find-file'. In that case,
1315 we may set up the file-specified mode and local variables,
1316 depending on the value of `enable-local-variables': if it is t, we do;
1317 if it is nil, we don't; otherwise, we query.
1318 In addition, if `local-enable-local-variables' is nil, we do
1319 not set local variables (though we do notice a mode specified with -*-.)
1321 `enable-local-variables' is ignored if you run `normal-mode' interactively,
1322 or from Lisp without specifying the optional argument FIND-FILE;
1323 in that case, this function acts as if `enable-local-variables' were t."
1332 enable-local-variables)))
1373 ;; Less common extensions come here
1374 ;; so more common ones above are found faster.
1384 ;; for MSDOS and MS-Windows (which are case-insensitive)
1428 ;; Mailer puts message to be edited in
1429 ;; /tmp/Re.... or Message
1434 ;; some news reader is reported to use this
1444 ;; .emacs following a directory delimiter
1445 ;; in Unix, MSDOG or VMS syntax.
1448 ;; _emacs following a directory delimiter
1449 ;; in MsDos syntax
1462 ;; Get rid of any trailing .n.m and try again.
1463 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
1464 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
1465 ;; Using mode nil rather than `ignore' would let the search continue
1466 ;; through this list (with the shortened name) rather than start over.
1468 ;; The following should come after the ChangeLog pattern
1469 ;; for the sake of ChangeLog.1, etc.
1470 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
1473 "Alist of filename patterns vs corresponding major mode functions.
1474 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
1475 \(NON-NIL stands for anything that is not nil; the value does not matter.)
1476 Visiting a file whose name matches REGEXP specifies FUNCTION as the
1477 mode function to use. FUNCTION will be called, unless it is nil.
1479 If the element has the form (REGEXP FUNCTION NON-NIL), then after
1480 calling FUNCTION (if it's not nil), we delete the suffix that matched
1526 "Alist mapping interpreter names to major modes.
1527 This alist applies to files whose first line starts with `#!'.
1528 Each element looks like (INTERPRETER . MODE).
1529 The car of each element is compared with
1530 the name of the interpreter specified in the first line.
1537 "List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
1538 When checking `inhibit-first-line-modes-regexps', we first discard
1544 "Regular expression matching interpreters, for file mode determination.
1545 This regular expression is matched against the first line of a file
1546 to determine the file's mode in `set-auto-mode' when Emacs can't deduce
1547 a mode from the file's name. If it matches, the file is assumed to
1548 be interpreted by the interpreter matched by the second group of the
1549 regular expression. The mode is then determined as the mode associated
1553 "Select major mode appropriate for current buffer.
1554 This checks for a -*- mode tag in the buffer's text,
1555 compares the filename against the entries in `auto-mode-alist',
1556 or checks the interpreter that runs this file against
1557 `interpreter-mode-alist'.
1559 It does not check for the `mode:' local variable in the
1560 Local Variables section of the file; for that, use `hack-local-variables'.
1562 If `enable-local-variables' is nil, this function does not check for a
1563 -*- mode tag.
1565 If the optional argument JUST-FROM-FILE-NAME is non-nil,
1566 then we do not set anything but the major mode,
1567 and we don't even do that unless it would come from the file name."
1568 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
1574 ;; Don't look for -*- if this file name matches any
1575 ;; of the regexps in inhibit-first-line-modes-regexps.
1583 sufs)
1590 ;; If the file begins with "#!"
1591 ;; (exec interpreter magic), look
1592 ;; for mode frobs in the first two
1593 ;; lines. You cannot necessarily
1594 ;; put them in the first line of
1595 ;; such a file without screwing up
1596 ;; the interpreter invocation.
1604 t))
1611 ;; Find all specifications for the `mode:' variable
1612 ;; and execute them left to right.
1624 modes))
1625 ;; Simple -*-MODE-*- case.
1628 modes)))))
1629 ;; If we found modes to use, invoke them now,
1630 ;; outside the save-excursion.
1637 ;; If we didn't find a mode from a -*- line, try using the file name.
1641 ;; Remove backup-suffixes from file name.
1647 ;; Find first matching alist entry.
1656 keep-going t)
1658 keep-going nil)))
1661 ;; When JUST-FROM-FILE-NAME is set,
1662 ;; we are working on behalf of set-visited-file-name.
1663 ;; In that case, if the major mode specified is the
1664 ;; same one we already have, don't actually reset it.
1665 ;; We don't want to lose minor modes such as Font Lock.
1668 ;; If we can't deduce a mode from the file name,
1669 ;; look for an interpreter specified in the first line.
1670 ;; As a special case, allow for things like "#!/bin/env perl",
1671 ;; which finds the interpreter anywhere in $PATH.
1678 elt)
1679 ;; Map interpreter name to a mode.
1681 interpreter-mode-alist))
1687 "Set local variables specified in the -*- line.
1688 Ignore any specification for `mode:' and `coding:';
1689 `set-auto-mode' should already have handled `mode:',
1690 `set-auto-coding' should already have handled `coding:'."
1697 ;; Parse the -*- line into the `result' alist.
1699 ;; doesn't have one.
1700 nil)
1702 ;; Simple form: "-*- MODENAME -*-". Already handled.
1703 nil)
1705 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
1706 ;; (last ";" is optional).
1715 ;; There used to be a downcase here,
1716 ;; but the manual didn't say so,
1717 ;; and people want to set var names that aren't all lc.
1724 ;; It is traditional to ignore
1725 ;; case when checking for `mode' in set-auto-mode,
1726 ;; so we must do that here as well.
1727 ;; That is inconsistent, but we're stuck with it.
1728 ;; The same can be said for `coding' in set-auto-coding.
1742 ;; If we fail to switch in the selected window,
1743 ;; it is probably a minibuffer.
1744 ;; So try another window.
1757 "Normal hook run after processing a file's local variables specs.
1758 Major modes can use this to examine user-specified local variables
1762 "Parse and put into effect this buffer's local variables spec.
1763 If MODE-ONLY is non-nil, all we do is check whether the major mode
1764 is specified, returning t if it is specified."
1767 ;; Look for "Local variables:" line in last page.
1777 mode-only
1787 buffer-file-name)
1791 prefix prefixlen suffix beg
1792 mode-specified
1794 ;; The prefix is what comes before "local variables:" in its line.
1795 ;; The suffix is what comes after "local variables:" in its line.
1810 ;; Look at next local variable spec.
1813 ;; Skip the prefix, if any.
1818 ;; Find the variable name; strip whitespace.
1826 val)
1827 ;; Setting variable named "end" means end of list.
1830 ;; Otherwise read the variable value.
1841 ;; Set the variable. "Variables" mode and eval are funny.
1845 mode-specified))
1851 ;; Get confirmation before setting these variables as locals in a file.
1868 ;; Don't wait for outline.el to be loaded, for the sake of outline-minor-mode.
1872 ;; This one is safe because the user gets to check it before it is used.
1880 A few variable names are treated specially."
1885 ;; We have already handled coding: tag in set-auto-coding.
1886 nil)
1888 nil)
1889 ;; "Setting" eval means either eval it or do nothing.
1890 ;; Likewise for setting hook variables.
1896 ;; Permit evalling a put of a harmless property.
1897 ;; if the args do nothing tricky.
1903 ;; Only allow safe values of lisp-indent-hook;
1904 ;; not functions.
1909 ;; Permit eval if not root and user says ok.
1928 ;; Ordinary variable, really set it.
1932 \f
1935 However, the mode will not be changed if
1936 \(1) a local variables list or the `-*-' line specifies a major mode, or
1938 \ not suitable for ordinary files, or
1939 \(3) the new file name does not particularly specify any mode."
1944 "Change name of file visited in current buffer to FILENAME.
1945 The next time the buffer is saved it will go in the newly specified file.
1946 nil or empty string as argument means make buffer not be visiting any file.
1947 Remember to delete the initial contents of the minibuffer
1948 if you wish to pass an empty string as the argument.
1950 The optional second argument NO-QUERY, if non-nil, inhibits asking for
1951 confirmation in the case where another buffer is already visiting FILENAME.
1953 The optional third argument ALONG-WITH-FILE, if non-nil, means that
1954 the old visited file has been renamed to the new name FILENAME."
1962 nil
1973 filename)))
1992 ;; Abbreviate the file names of the buffer.
2001 nil)))
2002 ;; write-file-hooks is normally used for things like ftp-find-file
2003 ;; that visit things that are not local files as if they were files.
2004 ;; Changing to visit an ordinary local file instead should flush the hook.
2009 ;; If buffer was read-only because of version control,
2010 ;; that reason is gone now, so make it writable.
2014 ;; Turn off backup files for certain file names.
2015 ;; Since this is a permanent local, the major mode won't eliminate it.
2022 ;; If auto-save was not already on, turn it on if appropriate.
2026 ;; If auto save is on, start using a new name.
2027 ;; We deliberately don't rename or delete the old auto save
2028 ;; for the old visited file name. This is because perhaps
2029 ;; the user wants to save the new state and then compare with the
2030 ;; previous state from the auto save file.
2033 ;; Rename the old auto save file if any.
2040 ;; Update the major mode, if the file name determines it.
2042 ;; Don't change the mode if it is special.
2045 ;; Don't change the mode if the local variable list specifies it.
2051 "Write current buffer into file FILENAME.
2052 This makes the buffer visit that file, and marks it as not modified.
2054 If you specify just a directory name as FILENAME, that means to use
2055 the default file name but in that directory. You can also yank
2056 the default file name into the minibuffer to edit it, using M-n.
2058 If the buffer is not already visiting a file, the default file name
2059 for the output file is the buffer name.
2061 If optional second arg CONFIRM is non-nil, this function
2062 asks for confirmation before overwriting an existing file.
2063 Interactively, confirmation is required unless you supply a prefix argument."
2064 ;; (interactive "FWrite file: ")
2068 nil nil nil nil)
2072 default-directory)
2073 nil nil))
2077 ;; If arg is just a directory,
2078 ;; use the default file name, but in that directory.
2089 ;; Make buffer writable if file is writable.
2094 \f
2096 "Make a backup of the disk file visited by the current buffer, if appropriate.
2097 This is normally done before saving the buffer the first time.
2098 If the value is non-nil, it is the result of `file-modes' on the original
2099 file; this means that the caller, after saving the buffer, should change
2100 the modes of the new file to agree with the old modes.
2102 A backup may be done by renaming or by copying; see documentation of
2103 variable `make-backup-files'. If it's done by renaming, then the file is
2104 no longer accessible under its old name."
2111 backup-info backupname targets setmodes)
2112 ;; If specified name is a symbolic link, chase it to the target.
2113 ;; Thus we make the backups in the directory where the real file is.
2118 ;; (if (file-directory-p buffer-file-name)
2119 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
2123 ;; If have old versions to maybe delete,
2124 ;; ask the user to confirm now, before doing anything.
2125 ;; But don't actually delete til later.
2130 real-file-name))))))
2131 ;; Actually write the back up file.
2134 ; (file-symlink-p buffer-file-name)
2135 backup-by-copying
2150 ;; If copying fails because file BACKUPNAME
2151 ;; is not writable, delete that file and try again.
2156 ;; rename-file should delete old backup.
2160 ;; If trouble writing the backup, write it in ~.
2170 ;; If copying fails because file BACKUPNAME
2171 ;; is not writable, delete that file and try again.
2177 ;; Now delete the old versions, if desired.
2184 setmodes)
2188 "Return file NAME sans backup versions or strings.
2189 This is a separate procedure so your site-init or startup file can
2190 redefine it.
2191 If the optional argument KEEP-BACKUP-VERSION is non-nil,
2192 we do not remove backup version numbers, only true file version numbers."
2198 ;; VMS version number is (a) semicolon, optional
2199 ;; sign, zero or more digits or (b) period, option
2200 ;; sign, zero or more digits, provided this is the
2201 ;; second period encountered outside of the
2202 ;; device/directory part of the file name.
2205 name)
2215 "Return t if deleting FILE and rewriting it would preserve the owner."
2220 ;; Return t if the file doesn't exist, since it's true that no
2221 ;; information would be lost by an (attempted) delete and create.
2227 The extension, in a file name, is the part that follows the last `.'."
2230 directory)
2234 directory)
2236 filename))))
2240 The extension, in a file name, is the part that follows the last `.'.
2241 Return nil for extensionless file names such as `foo'.
2242 Return the empty string for file names such as `foo.'.
2244 If PERIOD is non-nil, then the returned value includes the period
2245 that delimits the extension, and if FILENAME has no extension,
2255 "A function to use instead of the default `make-backup-file-name'.
2256 A value of nil gives the default `make-backup-file-name' behaviour.
2258 This could be buffer-local to do something special for specific
2259 files. If you define it, you may need to change `backup-file-name-p'
2260 and `file-name-sans-versions' too.
2262 See also `backup-directory-alist'."
2268 "Alist of filename patterns and backup directory names.
2269 Each element looks like (REGEXP . DIRECTORY). Backups of files with
2270 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
2271 relative or absolute. If it is absolute, so that all matching files
2272 are backed up into the same directory, the file names in this
2273 directory will be the full name of the file backed up with all
2274 directory separators changed to `!' to prevent clashes. This will not
2275 work correctly if your filesystem truncates the resulting name.
2277 For the common case of all backups going into one directory, the alist
2279 directory name.
2281 If this variable is nil, or it fails to match a filename, the backup
2282 is made in the original file's directory.
2284 On MS-DOS filesystems without long names this variable is always
2285 ignored."
2291 "Create the non-numeric backup file name for FILE.
2292 Normally this will just be the file's name with `~' appended.
2293 Customization hooks are provided as follows.
2295 If the variable `make-backup-file-name-function' is non-nil, its value
2296 should be a function which will be called with FILE as its argument;
2297 the resulting name is used.
2299 Otherwise a match for FILE is sought in `backup-directory-alist'; see
2300 the documentation of that variable. If the directory for the backup
2301 doesn't exist, it is created."
2315 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
2317 elt backup-directory dir-sep-string)
2322 alist nil)))
2324 file
2332 ;; Normalize DOSish file names: convert all slashes to
2333 ;; directory-sep-char, downcase the drive letter, if any,
2334 ;; and replace the leading "x:" with "/drive_x".
2337 ;; Replace any invalid file-name characters (for the
2338 ;; case of backing up remote files).
2343 "drive_"
2346 ""
2347 dir-sep-string)
2349 ;; Make the name unique by substituting directory
2350 ;; separators. It may not really be worth bothering about
2351 ;; doubling `!'s in the original name...
2354 directory-sep-char ?!
2356 backup-directory))
2363 "Return non-nil if FILE is a backup file name (numeric or not).
2364 This is a separate function so you can redefine it for customization.
2365 You may need to redefine `file-name-sans-versions' as well."
2370 ;; This is used in various files.
2371 ;; The usage of backup-extract-version-start is not very clean,
2372 ;; but I can't see a good alternative, so as of now I am leaving it alone.
2374 "Given the name of a numeric backup file, FN, return the backup number.
2375 Uses the free variable `backup-extract-version-start', whose value should be
2376 the index in the name where the version number begins."
2382 ;; I believe there is no need to alter this behavior for VMS;
2383 ;; since backup files are not made on VMS, it should not get called.
2385 "Find a file name for a backup file FN, and suggestions for deletions.
2386 Value is a list whose car is the name for the backup file
2387 and whose cdr is a list of old versions to consider deleting now.
2388 If the value is nil, don't make a backup.
2389 Uses `backup-directory-alist' in the same way as does
2390 `make-backup-file-name'."
2392 ;; Run a handler for this function so that ange-ftp can refuse to do it.
2396 ;; We don't support numbered backups on plain MS-DOS
2397 ;; when long file names are unavailable.
2407 possibilities deserve-versions-p versions)
2410 base-versions
2413 possibilities)
2414 #'<)
2419 kept-old-versions
2420 kept-new-versions
2427 ;; Delete nothing if there is overflow
2428 ;; in the number of versions to keep.
2434 v))))))))))
2437 "Return number of names file FILENAME has."
2441 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
2442 This function returns a relative file name which is equivalent to FILENAME
2443 when used with that default directory as the default.
2444 If this is impossible (which can happen on MSDOS and Windows
2445 when the file name and directory use different drive names)
2446 then it returns FILENAME."
2451 ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
2452 ;; drive names, they can't be relative, so return the absolute name.
2457 filename
2464 ".."
2466 ;; Now ancestor is empty, or .., or ../.., etc.
2468 ;; We matched within FNAME's directory part.
2469 ;; Add the rest of FNAME onto ANCESTOR.
2473 ;; But don't bother with ANCESTOR if it would give us `./'.
2474 rest
2476 ;; We matched FNAME's directory equivalent.
2477 ancestor))))))
2478 \f
2480 "Save current buffer in visited file if modified. Versions described below.
2481 By default, makes the previous version into a backup file
2482 if previously requested or if this is the first save.
2484 to become a backup when the next save is done.
2486 unconditionally makes the previous version into a backup file.
2488 to become a backup when the next save is done,
2489 and unconditionally makes the previous version into a backup file.
2491 With argument of 0, never make the previous version into a backup file.
2493 If a file's name is FOO, the names of its numbered backup versions are
2494 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
2495 Numeric backups (rather than FOO~) will be made if value of
2496 `version-control' is not the atom `never' and either there are already
2497 numeric versions of the file being backed up, or `version-control' is
2498 non-nil.
2499 We don't want excessive versions piling up, so there are variables
2500 `kept-old-versions', which tells Emacs how many oldest versions to keep,
2501 and `kept-new-versions', which tells how many newest versions to keep.
2502 Defaults are 2 old versions and 2 new.
2503 `dired-kept-versions' controls dired's clean-directory (.) command.
2504 If `delete-old-versions' is nil, system will query user
2505 before trimming versions. Otherwise it does it silently.
2507 If `vc-make-backup-files' is nil, which is the default,
2508 no backup files are made for files managed by version control.
2509 (This is because the version control system itself records previous versions.)
2511 See the subroutine `basic-save-buffer' for more information."
2524 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
2525 Normally delete only if the file was written by this Emacs since
2526 the last real save, but optional arg FORCE non-nil means delete anyway."
2540 "Normal hook that is run after a buffer is saved to its file."
2546 "If non-nil, use this coding system for saving the buffer.
2547 More precisely, use this coding system in place of the
2548 value of `buffer-file-coding-system', when saving the buffer.
2549 Calling `write-region' for any purpose other than saving the buffer
2550 will still use `buffer-file-coding-system'; this variable has no effect
2557 "Save the current buffer in its visited file, if it has been modified.
2558 The hooks `write-contents-hooks', `local-write-file-hooks' and
2559 `write-file-hooks' get a chance to do the job of saving; if they do not,
2560 then the buffer is saved in the visited file file in the usual way.
2561 After saving the buffer, this function runs `after-save-hook'."
2564 ;; In an indirect buffer, save its base buffer instead.
2569 setmodes tempsetmodes)
2570 ;; On VMS, rename file and buffer to get rid of version number.
2575 ;; Strip VMS version number before save.
2578 ;; Construct a (unique) buffer name to correspond.
2583 ;; If buffer has no file name, ask user for one.
2590 filename))
2615 ;; Support VC version backups.
2620 ;; If a hook returned t, file is already "written".
2621 ;; Otherwise, write it the usual way now.
2623 ;; Now we have saved the current buffer. Let's make sure
2624 ;; that buffer-file-coding-system is fixed to what
2625 ;; actually used for saving by binding it locally.
2635 ;; If the auto-save file was recent before this command,
2636 ;; delete it now.
2638 ;; Support VC `implicit' locking.
2643 ;; This does the "real job" of writing a buffer into its visited file
2644 ;; and making a backup file. This is what is normally done
2645 ;; but inhibited if one of write-file-hooks returns non-nil.
2646 ;; It returns a value to store in setmodes.
2666 buffer-file-name)))
2674 ;; If file is precious, write temp name, then rename it.
2675 ;; This requires write access to the containing dir,
2676 ;; which is why we don't try it if we don't have that access.
2678 tempname temp nogood i succeed
2682 ;; Find the temporary name to write under.
2689 "%s$tmp$%d"
2691 dir i))
2697 tempname nil realname
2698 buffer-file-truename)
2700 ;; If writing the temp file fails,
2701 ;; delete the temp file.
2706 ;; Since we have created an entirely new file
2707 ;; and renamed it, make sure it gets the
2708 ;; right permission bits set.
2710 ;; We succeeded in writing the temp file,
2711 ;; so rename it.
2713 ;; If file not writable, see if we can make it writable
2714 ;; temporarily while we write it.
2715 ;; But no need to do so if we have just backed it up
2716 ;; (setmodes is set) because that says we're superseding.
2718 ;; Change the mode back, after writing.
2722 buffer-file-name nil t buffer-file-truename)))
2723 setmodes))
2726 "Save some modified file-visiting buffers. Asks user about each one.
2727 Optional argument (the prefix) non-nil means save all with no questions.
2728 Optional second argument PRED determines which buffers are considered:
2729 If PRED is nil, all the file-visiting buffers are considered.
2730 If PRED is t, then certain non-file buffers will also be considered.
2731 If PRED is a zero-argument function, it indicates for each buffer whether
2732 to consider it or not when called with that buffer current."
2751 t
2770 ;; Return nil to ask about BUF again.
2771 nil)
2778 abbrev-file-name)))
2780 ;; Don't keep bothering user if he says no.
2782 t))))
2785 \f
2787 "Mark current buffer as unmodified, not needing to be saved.
2790 It is not a good idea to use this function in Lisp programs, because it
2791 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
2798 "Change whether this buffer is visiting its file read-only.
2799 With arg, set read-only iff arg is positive.
2800 If visiting file read-only and `view-read-only' is non-nil, enter view mode."
2806 ;; Toggle.
2818 "Insert contents of file FILENAME into buffer after point.
2819 Set mark after the inserted text.
2821 This function is meant for the user to run interactively.
2822 Don't call it from programs! Use `insert-file-contents' instead.
2823 \(Its calling sequence is different; see its documentation)."
2827 filename)))
2832 "Append the contents of the region to the end of file FILENAME.
2833 When called from a function, expects three arguments,
2834 START, END and FILENAME. START and END are buffer positions
2835 saying what text to write."
2840 "Return most recent backup file for FILENAME or nil if no backups exist."
2841 ;; `make-backup-file-name' will get us the right directory for
2842 ;; ordinary or numeric backups. It might create a directory for
2843 ;; backups as a side-effect, according to `backup-directory-alist'.
2850 tem)
2859 newest))
2862 "Rename current buffer to a similar name not already taken.
2863 This function is useful for creating multiple shell process buffers
2864 or multiple mail buffers, etc."
2872 ;; If the existing buffer name has a <NNN>,
2873 ;; which isn't part of the file name (if any),
2874 ;; then get rid of that.
2880 "Create the directory DIR and any nonexistent parent dirs.
2881 Interactively, the default choice of directory to create
2882 is the current default directory for file names.
2883 That is useful when you have visited a file in a nonexistent directory.
2885 Noninteractively, the second (optional) argument PARENTS says whether
2886 to create parent directories if they don't exist."
2889 nil nil)
2890 t))
2897 create-list)
2904 \f
2907 "Function to use to revert this buffer, or nil to do the default.
2908 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
2913 "Function to use to insert contents when reverting this buffer.
2914 Gets two args, first the nominal file name to use,
2915 and second, t if reading the auto-save file.
2920 "Normal hook for `revert-buffer' to run before reverting.
2921 If `revert-buffer-function' is used to override the normal revert
2925 "Normal hook for `revert-buffer' to run after reverting.
2926 Note that the hook value that it runs is the value that was in effect
2927 before reverting; that makes a difference if you have buffer-local
2928 hook functions.
2930 If `revert-buffer-function' is used to override the normal revert
2936 "Replace current buffer text with the text of the visited file on disk.
2937 This undoes all changes since the file was visited or saved.
2938 With a prefix argument, offer to revert from latest auto-save file, if
2939 that is more recent than the visited file.
2941 This command also works for special buffers that contain text which
2942 doesn't come from a file, but reflects some other data base instead:
2943 for example, Dired buffers and buffer-list buffers. In these cases,
2944 it reconstructs the buffer contents from the appropriate data base.
2946 When called from Lisp, the first argument is IGNORE-AUTO; only offer
2947 to revert from the auto-save file when this is nil. Note that the
2948 sense of this argument is the reverse of the prefix argument, for the
2949 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
2950 to nil.
2952 Optional second argument NOCONFIRM means don't ask for confirmation at
2953 all. (The local variable `revert-without-query', if non-nil, prevents
2954 confirmation.)
2956 Optional third argument PRESERVE-MODES non-nil means don't alter
2957 the files modes. Normally we reinitialize them using `normal-mode'.
2959 If the value of `revert-buffer-function' is non-nil, it is called to
2960 do all the work for this command. Otherwise, the hooks
2961 `before-revert-hook' and `after-revert-hook' are run at the beginning
2962 and the end, and if `revert-buffer-insert-file-contents-function' is
2963 non-nil, it is called instead of rereading visited file contents."
2965 ;; I admit it's odd to reverse the sense of the prefix argument, but
2966 ;; there is a lot of code out there which assumes that the first
2967 ;; argument should be t to avoid consulting the auto-save file, and
2968 ;; there's no straightforward way to encourage authors to notice a
2969 ;; reversal of the argument sense. So I'm just changing the user
2970 ;; interface, but leaving the programmatic interface the same.
2976 buffer-auto-save-file-name
2981 buffer-auto-save-file-name
2982 buffer-file-name)))
2993 found))
2995 file-name)))
2997 ;; If file was backed up but has changed since,
2998 ;; we shd make another backup.
3002 ;; Get rid of all undo records for this buffer.
3005 ;; Effectively copy the after-revert-hook status,
3006 ;; since after-find-file will clobber it.
3010 after-revert-hook)))
3012 ;; Don't make undo records for the reversion.
3016 file-name auto-save-p)
3019 ;; Bind buffer-file-name to nil
3020 ;; so that we don't try to lock the file.
3026 ;; Auto-saved file shoule be read without
3027 ;; any code conversion.
3029 coding-system-for-read)))
3030 ;; Note that this preserves point in an intelligent way.
3032 nil nil t))))
3033 ;; Recompute the truename in case changes in symlinks
3034 ;; have changed the truename.
3038 ;; Run after-revert-hook as it was before we reverted.
3046 t)))))
3049 "Visit file FILE, but get contents from its last auto-save file."
3050 ;; Actually putting the file name in the minibuffer should be used
3051 ;; only rarely.
3052 ;; Not just because users often use the default.
3071 ;; Use insert-directory-safely, not insert-directory,
3072 ;; because these files might not exist. In particular,
3073 ;; FILE might not exist if the auto-save file was for
3074 ;; a buffer that didn't visit a file, such as "*mail*".
3075 ;; The code in v20.x called `ls' directly, so we need
3076 ;; to emulate what `ls' did in that case.
3082 ;; Keep the current buffer-file-coding-system.
3084 ;; Auto-saved file shoule be read without any code conversion.
3093 "Recover auto save files from a previous Emacs session.
3094 This command first displays a Dired buffer showing you the
3095 previous sessions that you could recover from.
3096 To choose one, move point to the proper line and then type C-c C-c.
3097 Then you'll be asked about a number of files to recover."
3111 ;; Each line starts with a space
3112 ;; so that Font Lock mode won't highlight the first character.
3121 "Choose one saved session to recover auto-save files from.
3122 This command is used in the special Dired buffer created by
3125 ;; Get the name of the session file to recover from.
3127 files
3133 ;; Read in the auto-save-list file.
3137 ;; Loop thru the text of that file
3138 ;; and get out the names of the files to recover.
3142 ;; This is a pair of lines for a non-file-visiting buffer.
3143 ;; Get the auto-save file name and manufacture
3144 ;; a "visited file name" from that.
3160 ;; This pair of lines is a file-visiting
3161 ;; buffer. Use the visited file name.
3171 ;; Ignore a file if its auto-save file does not exist now.
3175 ;; The file contains a pair of line for each auto-saved buffer.
3176 ;; The first line of the pair contains the visited file name
3177 ;; or is empty if the buffer was not visiting a file.
3178 ;; The second line is the auto-save file name.
3186 files
3192 "For each buffer in LIST, ask whether to kill it.
3193 LIST defaults to all existing live buffers."
3204 name
3209 \f
3211 "Toggle auto-saving of contents of current buffer.
3212 With prefix argument ARG, turn auto-saving on if positive, else off."
3217 ;; If auto-save is off because buffer has shrunk,
3218 ;; then toggling should turn it on.
3223 buffer-file-name
3225 ;; If -1 was stored here, to temporarily turn off saving,
3226 ;; turn it back on.
3232 buffer-auto-save-file-name)
3235 "Adjust current buffer's auto save file name for current conditions.
3236 Also rename any existing auto save file, if it was made in this session."
3248 "Return file name to use for auto-saves of current buffer.
3249 Does not consider `auto-save-visited-file-name' as that variable is checked
3250 before calling this function. You can redefine this for customization.
3251 See also `auto-save-file-name-p'."
3255 result)
3256 ;; Apply user-specified translations
3257 ;; to the file name.
3261 filename)))
3273 "#"
3277 ;; Deal with buffers that don't have any associated files. (Mail
3278 ;; mode tends to create a good number of these.)
3282 ;; Eliminate all slashes and backslashes by
3283 ;; replacing them with sequences that start with %.
3284 ;; Quote % also, to keep distinct names distinct.
3293 ;; Generate the file name.
3296 ;; Try a few alternative directories, to get one we can write it.
3303 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
3304 FILENAME should lack slashes. You can redefine this for customization."
3306 \f
3308 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
3309 The generated regexp will match a filename iff the filename
3310 matches that wildcard according to shell rules. Only wildcards known
3311 by `sh' are supported."
3313 ;; Copy the initial run of non-special characters.
3316 ;; If no special characters, we're almost done.
3320 j)
3322 result
3343 ;; Found "[^". Insert a `\0' character
3344 ;; (which cannot happen in a filename)
3345 ;; into the character class, so that `^'
3346 ;; is not the first character after `[',
3347 ;; and thus non-special in a regexp.
3352 ;; I don't think `]' can appear in a
3353 ;; character class in a wildcard, but
3354 ;; let's be general here.
3361 i
3374 ;; Shell wildcards should match the entire filename,
3375 ;; not its part. Make the regexp say so.
3377 \f
3380 "*Switches for `list-directory' to pass to `ls' for brief listing."
3386 "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)"
3388 "*Switches for `list-directory' to pass to `ls' for verbose listing."
3393 "Expand wildcard pattern PATTERN.
3394 This returns a list of file names which match the pattern.
3396 If PATTERN is written as an absolute relative file name,
3397 the values are absolute also.
3399 If PATTERN is written as a relative file name, it is interpreted
3400 relative to the current default directory, `default-directory'.
3401 The file names returned are normally also relative to the current
3402 default directory. However, if FULL is non-nil, they are absolute."
3405 ;; A list of all dirs that DIRPART specifies.
3406 ;; This can be more than one dir
3407 ;; if DIRPART contains wildcards.
3412 contents)
3417 ;; Filter out "." and ".."
3422 name))
3429 this-dir-contents)
3430 this-dir-contents)
3431 contents))))
3433 contents))
3436 "Display a list of files in or matching DIRNAME, a la `ls'.
3437 DIRNAME is globbed by the shell if necessary.
3438 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
3439 Actions controlled by variables `list-directory-brief-switches'
3440 and `list-directory-verbose-switches'."
3444 nil default-directory nil)
3445 pfx)))
3447 list-directory-brief-switches)))
3465 "Quote characters special to the shell in PATTERN, leave wildcards alone.
3467 PATTERN is assumed to represent a file-name wildcard suitable for the
3468 underlying filesystem. For Unix and GNU/Linux, the characters from the
3470 the parts of the pattern which don't include wildcard characters are
3471 quoted with double quotes.
3472 Existing quote characters in PATTERN are left alone, so you can pass
3473 PATTERN that already quotes some of the special characters."
3477 ;; DOS/Windows don't allow `"' in file names. So if the
3478 ;; argument has quotes, we can safely assume it is already
3479 ;; quoted by the caller.
3481 ;; We quote [&()#$'] in case their shell is a port of a
3482 ;; Unixy shell. We quote [,=+] because stock DOS and
3483 ;; Windows shells require that in some cases, such as
3484 ;; passing arguments to batch files that use positional
3485 ;; arguments like %1.
3487 pattern
3490 end)
3507 pattern))))
3513 ;; insert-directory
3514 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
3515 ;; FULL-DIRECTORY-P is nil.
3516 ;; The single line of output must display FILE's name as it was
3517 ;; given, namely, an absolute path name.
3518 ;; - must insert exactly one line for each file if WILDCARD or
3519 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
3520 ;; before the file lines, plus optional text after the file lines.
3521 ;; Lines are delimited by "\n", so filenames containing "\n" are not
3522 ;; allowed.
3523 ;; File lines should display the basename.
3524 ;; - must be consistent with
3525 ;; - functions dired-move-to-filename, (these two define what a file line is)
3526 ;; dired-move-to-end-of-filename,
3527 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
3528 ;; dired-insert-headerline
3529 ;; dired-after-subdir-garbage (defines what a "total" line is)
3530 ;; - variable dired-subdir-regexp
3532 "Insert directory listing for FILE, formatted according to SWITCHES.
3533 Leaves point after the inserted text.
3534 SWITCHES may be a string of options, or a list of strings.
3535 Optional third arg WILDCARD means treat FILE as shell wildcard.
3536 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
3537 switches do not contain `d', so that a full listing is expected.
3539 This works by running a directory listing program
3540 whose name is in the variable `insert-directory-program'.
3541 If WILDCARD, it also runs the shell specified by `shell-file-name'."
3542 ;; We need the directory in order to find the right handler.
3547 wildcard full-directory-p)
3553 default-file-name-coding-system)))
3554 ;; This is to control encoding the arguments in call-process.
3558 ;; Run ls in the directory of the file pattern we asked for
3565 shell-file-name nil t nil
3567 ""
3569 insert-directory-program
3570 " -d "
3572 switches
3574 " -- "
3575 ;; Quote some characters that have
3576 ;; special meanings in shells; but
3577 ;; don't quote the wildcards--we
3578 ;; want them to be special. We
3579 ;; also currently don't quote the
3580 ;; quoting characters in case
3581 ;; people want to use them
3582 ;; explicitly to quote wildcard
3583 ;; characters.
3585 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
3586 ;; directory if FILE is a symbolic link.
3588 insert-directory-program nil t nil
3592 ;; Split the switches at any spaces so we can
3593 ;; pass separate options as separate args.
3595 ;; Avoid lossage if FILE starts with `-'.
3603 file))))))))
3605 ;; We get here if `insert-directory-program' failed.
3606 ;; On non-Posix systems, we cannot open a directory, so
3607 ;; don't even try, because that will always result in
3608 ;; the ubiquitous "Access denied". Instead, show them
3609 ;; the `ls' command line and let them guess what went
3610 ;; wrong.
3615 insert-directory-program
3617 file result)
3618 ;; Unix. Access the file to get a suitable error.
3620 ;; Replace "total" with "used", to avoid confusion.
3621 ;; Add in the amount of free space.
3641 "Insert directory listing for FILE, formatted according to SWITCHES.
3643 Like `insert-directory', but if FILE does not exist, it inserts a
3644 message to that effect instead of signaling an error."
3647 ;; Simulate the message printed by `ls'.
3651 "Functions to call with no arguments to query about killing Emacs.
3652 If any of these functions returns nil, killing Emacs is cancelled.
3654 but `kill-emacs', the low level primitive, does not.
3658 "How to ask for confirmation when leaving Emacs.
3659 If nil, the default, don't ask at all. If the value is non-nil, it should
3660 be a predicate function such as `yes-or-no-p'."
3668 "Offer to save each buffer, then kill this Emacs process.
3669 With prefix arg, silently save all file-visiting buffers, then kill."
3678 ;; process-list is not defined on VMS.
3680 active)
3685 val)
3691 ;; Query the user for other things, perhaps.
3696 \f
3697 ;; We use /: as a prefix to "quote" a file name
3698 ;; so that magic file name handlers will not apply to it.
3702 file-name-handler-alist))
3704 ;; We depend on being the last handler on the list,
3705 ;; so that anything else which does need handling
3706 ;; has been handled already.
3707 ;; So it is safe for us to inhibit *all* magic file name handlers.
3716 default-directory))
3717 ;; Get a list of the indices of the args which are file names.
3720 ;; The first four are special because they
3721 ;; return a file name. We want to include the /:
3722 ;; in the return value.
3723 ;; So just avoid stripping it in the first place.
3725 ;; `identity' means just return the first arg
3726 ;; as stripped of its quoting.
3737 ;; For all other operations, treat the first argument only
3738 ;; as the file name.
3740 ;; Copy ARGUMENTS so we can replace elements in it.
3742 ;; Strip off the /: from the file names that have this handler.
3750 "/"
3756 \f
3779 ;;; files.el ends here