| blob | 17c54f69d516b335d2e59832040e68513774845a |
1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985, 86, 87, 92, 93,
4 ;; 94, 95, 96, 97, 98, 99, 2000 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."
544 "Load the library named LIBRARY.
545 This is an interface to the function `load'."
550 "Copy the file FILE into a temporary file on this machine.
551 Returns the name of the local copy, or nil, if FILE is directly
552 accessible."
553 ;; This formerly had an optional BUFFER argument that wasn't used by
554 ;; anything.
558 nil)))
561 "Return the truename of FILENAME, which should be absolute.
562 The truename of a file name is found by chasing symbolic links
563 both at the level of the file and at the level of the directories
564 containing it, until no links are left at any level.
566 The arguments COUNTER and PREV-DIRS are used only in recursive calls.
567 Do not specify them in other calls."
568 ;; COUNTER can be a cons cell whose car is the count of how many more links
569 ;; to chase before getting an error.
570 ;; PREV-DIRS can be a cons cell whose car is an alist
571 ;; of truenames we've just recently computed.
573 ;; The last test looks dubious, maybe `+' is meant here? --simon.
583 ;; For speed, remove the ange-ftp completion handler from the list.
584 ;; We know it's not needed here.
585 ;; For even more speed, do this only on the outermost call.
592 ;; andrewi@harlequin.co.uk - none of the following code (except for
593 ;; invoking the file-name handler) currently applies on Windows
594 ;; (ie. there are no native symlinks), but there is an issue with
595 ;; case differences being ignored by the OS, and short "8.3 DOS"
596 ;; name aliases existing for all files. (The short names are not
597 ;; reported by directory-files, but can be used to refer to files.)
598 ;; It seems appropriate for file-truename to resolve these issues in
599 ;; the most natural way, which on Windows is to call the function
600 ;; `w32-long-file-name' - this returns the exact name of a file as
601 ;; it is stored on disk (expanding short name aliases with the full
602 ;; name in the process).
605 newname)
606 ;; For file name that has a special handler, call handler.
607 ;; This is so that ange-ftp can save time by doing a no-op.
610 ;; If filename contains a wildcard, newname will be the old name.
613 ;; If filename doesn't exist, newname will be nil.
618 ;; If this file directly leads to a link, process that iteratively
619 ;; so that we don't use lots of stack.
625 ;; For file name that has a special handler, call handler.
626 ;; This is so that ange-ftp can save time by doing a no-op.
629 done t)
631 target dirfile)
632 ;; Get the truename of the directory.
634 ;; If these are equal, we have the (or a) root directory.
636 ;; If this is the same dir we last got the truename for,
637 ;; save time--don't recalculate.
647 done t)
650 done t)
651 ;; Put it back on the file name.
653 ;; Is the file name the name of a link?
656 ;; Yes => chase that link, then start all over
657 ;; since the link may point to a directory name that uses links.
658 ;; We can't safely use expand-file-name here
659 ;; since target might look like foo/../bar where foo
660 ;; is itself a link. Instead, we handle . and .. above.
663 target
665 done nil)
666 ;; No, we are done!
668 filename))
671 "Chase links in FILENAME until a name that is not a link.
672 Does not examine containing directories for links,
673 unlike `file-truename'."
679 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
682 ;; Handle `..' by hand, since it needs to work in the
683 ;; target of any directory symlink.
684 ;; This code is not quite complete; it does not handle
685 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
689 ;; Chase links in the default dir of the symlink.
693 ;; Now find the parent of that dir.
697 newname))
698 \f
700 "Select buffer BUFFER in another window.
701 Optional second arg NORECORD non-nil means
702 do not put this buffer at the front of the list of recently selected ones."
708 "Switch to buffer BUFFER in another frame.
709 Optional second arg NORECORD non-nil means
710 do not put this buffer at the front of the list of recently selected ones."
717 "Edit file FILENAME.
718 Switch to a buffer visiting file FILENAME,
719 creating one if none already exists.
720 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
721 expand wildcards (if any) and visit multiple files. Wildcard expansion
722 can be suppressed by setting `find-file-wildcards'."
730 "Edit file FILENAME, in another window.
731 May create a new window, or reuse an existing one.
732 See the function `display-buffer'.
733 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
734 expand wildcards (if any) and visit multiple files."
745 "Edit file FILENAME, in another frame.
746 May create a new frame, or reuse an existing one.
747 See the function `display-buffer'.
748 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
749 expand wildcards (if any) and visit multiple files."
760 "Edit file FILENAME but don't allow changes.
761 Like `find-file' but marks buffer as read-only.
769 "Edit file FILENAME in another window but don't allow changes.
778 "Edit file FILENAME in another frame but don't allow changes.
787 "Find file FILENAME as a replacement for the file in the next window.
788 This command does not select that window."
807 "Find file FILENAME, select its buffer, kill previous buffer.
808 If the current buffer now contains an empty file that you just visited
809 \(presumably by mistake), use this command to visit the file you really want."
820 ;; (not buffer-read-only)
847 \f
849 "Create a suitably named buffer for visiting FILENAME, and return it.
850 FILENAME (sans directory) is used unchanged if that name is free;
851 otherwise a string <2> or <3> or ... is appended to get an unused name."
858 "Create and return a buffer with a name based on NAME.
859 Choose the buffer's name using `generate-new-buffer-name'."
863 "Regexp to match the automounter prefix in a directory name."
871 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
874 ;; Get rid of the prefixes added by the automounter.
881 ;; If any elt of directory-abbrev-alist matches this name,
882 ;; abbreviate accordingly.
888 ;; Compute and save the abbreviated homedir name.
889 ;; We defer computing this until the first time it's needed, to
890 ;; give time for directory-abbrev-alist to be set properly.
891 ;; We include a slash at the end, to avoid spurious matches
892 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
899 ;; If FILENAME starts with the abbreviated homedir,
900 ;; make it start with `~' instead.
902 ;; If the home dir is just /, don't change it.
905 ;; MS-DOS root directories can come with a drive letter;
906 ;; Novell Netware allows drive letters beyond `Z:'.
915 filename))
918 "*List of logical names for which visiting shouldn't save the true dirname.
919 On VMS, when you visit a file using a logical name that searches a path,
920 you may or may not want the visited file name to record the specific
921 directory where the file was found. If you *do not* want that, add the logical
922 name to this list as a string."
927 "Return the buffer visiting file FILENAME (a string).
928 This is like `get-file-buffer', except that it checks for any buffer
929 visiting the same file, possibly under a different name.
930 If there is no such live buffer, return nil."
942 found)
946 number
952 ;; Verify this buffer's file number
953 ;; still belongs to its file.
956 number))
959 found))))
960 \f
962 "*Non-nil means file-visiting commands should handle wildcards.
963 For example, if you specify `*.c', that would visit all the files
964 whose names match the pattern."
970 "Read file FILENAME into a buffer and return the buffer.
971 If a buffer exists visiting FILENAME, return that one, but
972 verify that the file has not changed since visited or saved.
973 The buffer is not selected, just returned to the caller.
974 Optional first arg NOWARN non-nil means suppress any warning messages.
975 Optional second arg RAWFILE non-nil means the file is read literally.
976 Optional third arg WILDCARDS non-nil means do wildcard processing
977 and visit all the matching files. When wildcards are actually
978 used and expanded, the value is a list of buffers
979 that are visiting the various files."
986 'find-directory-functions
989 filename)))
992 find-file-wildcards
1005 ;; Find any buffer for a file which has same truename.
1007 ;; Let user know if there is a buffer with the same truename.
1014 ;; Optionally also find that buffer.
1018 ;; We are using an existing buffer.
1024 ;; Certain files should be reverted automatically
1025 ;; if they have changed on disk and not in the buffer.
1033 found))
1043 "File %s changed on disk. Discard your edits? "
1048 "File %s changed on disk. Discard your edits in %s? "
1059 "Save file and revisit literally? "
1064 rawfile truename number))
1066 "Discard your edits and revisit file literally? "
1069 rawfile truename number)
1073 "Revisit file literally? "
1076 rawfile truename number)
1079 ;; Return the buffer we are using.
1080 buf)
1081 ;; Create a new buffer.
1084 ;; find-file-noselect-1 may use a different buffer.
1086 rawfile truename number))))))
1090 error)
1093 ;; Needed in case we are re-visiting the file with a different
1094 ;; text representation.
1108 filename)))
1109 ;; Unconditionally set error
1118 filename)))
1119 ;; Run find-file-not-found-hooks until one returns non-nil.
1121 ;; If they fail too, set error.
1123 ;; Record the file's truename, and maybe use that as visited name.
1129 ;; On VMS, we may want to remember which directory in a search list
1130 ;; the file was found in.
1142 ;; Set buffer's default directory to that of the file.
1144 ;; Turn off backup files for certain file names. Since
1145 ;; this is a permanent local, the major mode won't eliminate it.
1158 \f
1160 "Like `insert-file-contents', but only reads in the file literally.
1161 A buffer may be modified in several ways after reading into the buffer,
1162 to Emacs features such as format decoding, character code
1163 conversion, find-file-hooks, automatic uncompression, etc.
1165 This function ensures that none of these modifications will take place."
1174 nil)))
1184 "Insert contents of file FILENAME into buffer after point with no conversion.
1186 This function is meant for the user to run interactively.
1187 Don't call it from programs! Use `insert-file-contents-literally' instead.
1188 \(Its calling sequence is different; see its documentation)."
1192 filename)))
1197 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
1202 "Visit file FILENAME with no conversion of any kind.
1203 Format conversion and character code conversion are both disabled,
1204 and multibyte characters are disabled in the resulting buffer.
1205 The major mode used is Fundamental mode regardless of the file name,
1206 and local variable specifications in the file are ignored.
1207 Automatic uncompression is also disabled.
1209 You cannot absolutely rely on this function to result in
1210 visiting the file literally. If Emacs already has a buffer
1211 which is visiting the file, you get the existing buffer,
1212 regardless of whether it was created literally or not.
1214 In a Lisp program, if you want to be sure of accessing a file's
1215 contents literally, you should create a temporary buffer and then read
1216 the file contents into it using `insert-file-contents-literally'."
1219 \f
1223 after-find-file-from-revert-buffer
1224 nomodes)
1225 "Called after finding a file and by the default revert function.
1226 Sets buffer mode, parses local variables.
1227 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
1228 error in reading the file. WARN non-nil means warn if there
1229 exists an auto-save file more recent than the visited file.
1230 NOAUTO means don't mess with auto-save mode.
1231 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER non-nil
1232 means this call was from `revert-buffer'.
1233 Fifth arg NOMODES non-nil means don't alter the file's modes.
1234 Finishes by calling the functions in `find-file-hooks'
1235 unless NOMODES is non-nil."
1238 nil
1246 ;; No need to warn if buffer is auto-saved
1247 ;; under the name of the visited file.
1249 auto-save-visited-file-name))
1252 buffer-file-name))
1266 (if (file-exists-p (file-name-directory (directory-file-name (file-name-directory buffer-file-name))))
1267 "Use M-x make-directory RET RET to create the directory"
1275 ;; Make people do a little extra work (C-x C-q)
1276 ;; before altering a backup file.
1280 nil
1290 "Choose the major mode for this buffer automatically.
1291 Also sets up any specified local variables of the file.
1292 Uses the visited file name, the -*- line, and the local variables spec.
1294 This function is called automatically from `find-file'. In that case,
1295 we may set up the file-specified mode and local variables,
1296 depending on the value of `enable-local-variables': if it is t, we do;
1297 if it is nil, we don't; otherwise, we query.
1298 In addition, if `local-enable-local-variables' is nil, we do
1299 not set local variables (though we do notice a mode specified with -*-.)
1301 `enable-local-variables' is ignored if you run `normal-mode' interactively,
1302 or from Lisp without specifying the optional argument FIND-FILE;
1303 in that case, this function acts as if `enable-local-variables' were t."
1312 enable-local-variables)))
1353 ;;; Less common extensions come here
1354 ;;; so more common ones above are found faster.
1364 ;; for MSDOS and MS-Windows (which are case-insensitive)
1379 ;;; The following should come after the ChangeLog pattern
1380 ;;; for the sake of ChangeLog.1, etc.
1381 ;;; and after the .scm.[0-9] pattern too.
1412 ;; Mailer puts message to be edited in
1413 ;; /tmp/Re.... or Message
1418 ;; some news reader is reported to use this
1428 ;; .emacs following a directory delimiter
1429 ;; in Unix, MSDOG or VMS syntax.
1432 ;; _emacs following a directory delimiter
1433 ;; in MsDos syntax
1448 "Alist of filename patterns vs corresponding major mode functions.
1449 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
1450 \(NON-NIL stands for anything that is not nil; the value does not matter.)
1451 Visiting a file whose name matches REGEXP specifies FUNCTION as the
1452 mode function to use. FUNCTION will be called, unless it is nil.
1454 If the element has the form (REGEXP FUNCTION NON-NIL), then after
1455 calling FUNCTION (if it's not nil), we delete the suffix that matched
1501 "Alist mapping interpreter names to major modes.
1502 This alist applies to files whose first line starts with `#!'.
1503 Each element looks like (INTERPRETER . MODE).
1504 The car of each element is compared with
1505 the name of the interpreter specified in the first line.
1512 "List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
1513 When checking `inhibit-first-line-modes-regexps', we first discard
1519 "Regular expression matching interpreters, for file mode determination.
1520 This regular expression is matched against the first line of a file
1521 to determine the file's mode in `set-auto-mode' when Emacs can't deduce
1522 a mode from the file's name. If it matches, the file is assumed to
1523 be interpreted by the interpreter matched by the second group of the
1524 regular expression. The mode is then determined as the mode associated
1528 "Select major mode appropriate for current buffer.
1529 This checks for a -*- mode tag in the buffer's text,
1530 compares the filename against the entries in `auto-mode-alist',
1531 or checks the interpreter that runs this file against
1532 `interpreter-mode-alist'.
1534 It does not check for the `mode:' local variable in the
1535 Local Variables section of the file; for that, use `hack-local-variables'.
1537 If `enable-local-variables' is nil, this function does not check for a
1538 -*- mode tag.
1540 If the optional argument JUST-FROM-FILE-NAME is non-nil,
1541 then we do not set anything but the major mode,
1542 and we don't even do that unless it would come from the file name."
1543 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
1549 ;; Don't look for -*- if this file name matches any
1550 ;; of the regexps in inhibit-first-line-modes-regexps.
1558 sufs)
1565 ;; If the file begins with "#!"
1566 ;; (exec interpreter magic), look
1567 ;; for mode frobs in the first two
1568 ;; lines. You cannot necessarily
1569 ;; put them in the first line of
1570 ;; such a file without screwing up
1571 ;; the interpreter invocation.
1579 t))
1586 ;; Find all specifications for the `mode:' variable
1587 ;; and execute them left to right.
1599 modes)))
1600 ;; Simple -*-MODE-*- case.
1603 modes))))))
1604 ;; If we found modes to use, invoke them now,
1605 ;; outside the save-excursion.
1610 ;; If we didn't find a mode from a -*- line, try using the file name.
1614 ;; Remove backup-suffixes from file name.
1620 ;; Find first matching alist entry.
1629 keep-going t)
1631 keep-going nil)))
1634 ;; When JUST-FROM-FILE-NAME is set,
1635 ;; we are working on behalf of set-visited-file-name.
1636 ;; In that case, if the major mode specified is the
1637 ;; same one we already have, don't actually reset it.
1638 ;; We don't want to lose minor modes such as Font Lock.
1641 ;; If we can't deduce a mode from the file name,
1642 ;; look for an interpreter specified in the first line.
1643 ;; As a special case, allow for things like "#!/bin/env perl",
1644 ;; which finds the interpreter anywhere in $PATH.
1651 elt)
1652 ;; Map interpreter name to a mode.
1654 interpreter-mode-alist))
1660 "Set local variables specified in the -*- line.
1661 Ignore any specification for `mode:' and `coding:';
1662 `set-auto-mode' should already have handled `mode:',
1663 `set-auto-coding' should already have handled `coding:'."
1670 ;; Parse the -*- line into the `result' alist.
1672 ;; doesn't have one.
1673 nil)
1675 ;; Simple form: "-*- MODENAME -*-". Already handled.
1676 nil)
1678 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
1679 ;; (last ";" is optional).
1688 ;; There used to be a downcase here,
1689 ;; but the manual didn't say so,
1690 ;; and people want to set var names that aren't all lc.
1697 ;; It is traditional to ignore
1698 ;; case when checking for `mode' in set-auto-mode,
1699 ;; so we must do that here as well.
1700 ;; That is inconsistent, but we're stuck with it.
1701 ;; The same can be said for `coding' in set-auto-coding.
1715 ;; If we fail to switch in the selected window,
1716 ;; it is probably a minibuffer.
1717 ;; So try another window.
1730 "Normal hook run after processing a file's local variables specs.
1731 Major modes can use this to examine user-specified local variables
1735 "Parse and put into effect this buffer's local variables spec.
1736 If MODE-ONLY is non-nil, all we do is check whether the major mode
1737 is specified, returning t if it is specified."
1740 ;; Look for "Local variables:" line in last page.
1750 mode-only
1760 buffer-file-name)
1764 prefix prefixlen suffix beg
1765 mode-specified
1767 ;; The prefix is what comes before "local variables:" in its line.
1768 ;; The suffix is what comes after "local variables:" in its line.
1783 ;; Look at next local variable spec.
1786 ;; Skip the prefix, if any.
1791 ;; Find the variable name; strip whitespace.
1799 val)
1800 ;; Setting variable named "end" means end of list.
1803 ;; Otherwise read the variable value.
1814 ;; Set the variable. "Variables" mode and eval are funny.
1818 mode-specified))
1824 ;; Get confirmation before setting these variables as locals in a file.
1841 ;; Don't wait for outline.el to be loaded, for the sake of outline-minor-mode.
1845 ;; This one is safe because the user gets to check it before it is used.
1853 A few variable names are treated specially."
1858 ;; We have already handled coding: tag in set-auto-coding.
1859 nil)
1861 nil)
1862 ;; "Setting" eval means either eval it or do nothing.
1863 ;; Likewise for setting hook variables.
1869 ;; Permit evalling a put of a harmless property.
1870 ;; if the args do nothing tricky.
1876 ;; Only allow safe values of lisp-indent-hook;
1877 ;; not functions.
1882 ;; Permit eval if not root and user says ok.
1901 ;; Ordinary variable, really set it.
1905 \f
1908 However, the mode will not be changed if
1909 \(1) a local variables list or the `-*-' line specifies a major mode, or
1911 \ not suitable for ordinary files, or
1912 \(3) the new file name does not particularly specify any mode."
1917 "Change name of file visited in current buffer to FILENAME.
1918 The next time the buffer is saved it will go in the newly specified file.
1919 nil or empty string as argument means make buffer not be visiting any file.
1920 Remember to delete the initial contents of the minibuffer
1921 if you wish to pass an empty string as the argument.
1923 The optional second argument NO-QUERY, if non-nil, inhibits asking for
1924 confirmation in the case where another buffer is already visiting FILENAME.
1926 The optional third argument ALONG-WITH-FILE, if non-nil, means that
1927 the old visited file has been renamed to the new name FILENAME."
1935 nil
1946 filename)))
1965 ;; Abbreviate the file names of the buffer.
1974 nil)))
1975 ;; write-file-hooks is normally used for things like ftp-find-file
1976 ;; that visit things that are not local files as if they were files.
1977 ;; Changing to visit an ordinary local file instead should flush the hook.
1982 ;; If buffer was read-only because of version control,
1983 ;; that reason is gone now, so make it writable.
1987 ;; Turn off backup files for certain file names.
1988 ;; Since this is a permanent local, the major mode won't eliminate it.
1995 ;; If auto-save was not already on, turn it on if appropriate.
1999 ;; If auto save is on, start using a new name.
2000 ;; We deliberately don't rename or delete the old auto save
2001 ;; for the old visited file name. This is because perhaps
2002 ;; the user wants to save the new state and then compare with the
2003 ;; previous state from the auto save file.
2006 ;; Rename the old auto save file if any.
2013 ;; Update the major mode, if the file name determines it.
2015 ;; Don't change the mode if it is special.
2018 ;; Don't change the mode if the local variable list specifies it.
2024 "Write current buffer into file FILENAME.
2025 This makes the buffer visit that file, and marks it as not modified.
2027 If you specify just a directory name as FILENAME, that means to use
2028 the default file name but in that directory. You can also yank
2029 the default file name into the minibuffer to edit it, using M-n.
2031 If the buffer is not already visiting a file, the default file name
2032 for the output file is the buffer name.
2034 If optional second arg CONFIRM is non-nil, this function
2035 asks for confirmation before overwriting an existing file.
2036 Interactively, confirmation is required unless you supply a prefix argument."
2037 ;; (interactive "FWrite file: ")
2041 nil nil nil nil)
2045 default-directory)
2046 nil nil))
2050 ;; If arg is just a directory,
2051 ;; use the default file name, but in that directory.
2062 ;; Make buffer writable if file is writable.
2067 \f
2069 "Make a backup of the disk file visited by the current buffer, if appropriate.
2070 This is normally done before saving the buffer the first time.
2071 If the value is non-nil, it is the result of `file-modes' on the original
2072 file; this means that the caller, after saving the buffer, should change
2073 the modes of the new file to agree with the old modes.
2075 A backup may be done by renaming or by copying; see documentation of
2076 variable `make-backup-files'. If it's done by renaming, then the file is
2077 no longer accessible under its old name."
2084 backup-info backupname targets setmodes)
2085 ;; If specified name is a symbolic link, chase it to the target.
2086 ;; Thus we make the backups in the directory where the real file is.
2091 ;;; (if (file-directory-p buffer-file-name)
2092 ;;; (error "Cannot save buffer in directory %s" buffer-file-name))
2096 ;; If have old versions to maybe delete,
2097 ;; ask the user to confirm now, before doing anything.
2098 ;; But don't actually delete til later.
2103 real-file-name))))))
2104 ;; Actually write the back up file.
2107 ; (file-symlink-p buffer-file-name)
2108 backup-by-copying
2123 ;; If copying fails because file BACKUPNAME
2124 ;; is not writable, delete that file and try again.
2129 ;; rename-file should delete old backup.
2133 ;; If trouble writing the backup, write it in ~.
2143 ;; If copying fails because file BACKUPNAME
2144 ;; is not writable, delete that file and try again.
2150 ;; Now delete the old versions, if desired.
2157 setmodes)
2161 "Return file NAME sans backup versions or strings.
2162 This is a separate procedure so your site-init or startup file can
2163 redefine it.
2164 If the optional argument KEEP-BACKUP-VERSION is non-nil,
2165 we do not remove backup version numbers, only true file version numbers."
2171 ;; VMS version number is (a) semicolon, optional
2172 ;; sign, zero or more digits or (b) period, option
2173 ;; sign, zero or more digits, provided this is the
2174 ;; second period encountered outside of the
2175 ;; device/directory part of the file name.
2178 name)
2188 "Return t if deleting FILE and rewriting it would preserve the owner."
2193 ;; Return t if the file doesn't exist, since it's true that no
2194 ;; information would be lost by an (attempted) delete and create.
2200 The extension, in a file name, is the part that follows the last `.'."
2203 directory)
2207 directory)
2209 filename))))
2213 The extension, in a file name, is the part that follows the last `.'.
2214 Return nil for extensionless file names such as `foo'.
2215 Return the empty string for file names such as `foo.'.
2217 If PERIOD is non-nil, then the returned value includes the period
2218 that delimits the extension, and if FILENAME has no extension,
2228 "A function to use instead of the default `make-backup-file-name'.
2229 A value of nil gives the default `make-backup-file-name' behaviour.
2231 This could be buffer-local to do something special for for specific
2232 files. If you define it, you may need to change `backup-file-name-p'
2233 and `file-name-sans-versions' too.
2235 See also `backup-directory-alist'."
2241 "Alist of filename patterns and backup directory names.
2242 Each element looks like (REGEXP . DIRECTORY). Backups of files with
2243 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
2244 relative or absolute. If it is absolute, so that all matching files
2245 are backed up into the same directory, the file names in this
2246 directory will be the full name of the file backed up with all
2247 directory separators changed to `!' to prevent clashes. This will not
2248 work correctly if your filesystem truncates the resulting name.
2250 For the common case of all backups going into one directory, the alist
2252 directory name.
2254 If this variable is nil, or it fails to match a filename, the backup
2255 is made in the original file's directory.
2257 On MS-DOS filesystems without long names this variable is always
2258 ignored."
2264 "Create the non-numeric backup file name for FILE.
2265 Normally this will just be the file's name with `~' appended.
2266 Customization hooks are provided as follows.
2268 If the variable `make-backup-file-name-function' is non-nil, its value
2269 should be a function which will be called with FILE as its argument;
2270 the resulting name is used.
2272 Otherwise a match for FILE is sought in `backup-directory-alist'; see
2273 the documentation of that variable. If the directory for the backup
2274 doesn't exist, it is created."
2288 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
2290 elt backup-directory dir-sep-string)
2295 alist nil)))
2297 file
2305 ;; Normalize DOSish file names: convert all slashes to
2306 ;; directory-sep-char, downcase the drive letter, if any,
2307 ;; and replace the leading "x:" with "/drive_x".
2310 ;; Replace any invalid file-name characters (for the
2311 ;; case of backing up remote files).
2320 "drive_"
2323 ""
2324 dir-sep-string)
2326 ;; Make the name unique by substituting directory
2327 ;; separators. It may not really be worth bothering about
2328 ;; doubling `!'s in the original name...
2331 directory-sep-char ?!
2333 backup-directory))
2340 "Return non-nil if FILE is a backup file name (numeric or not).
2341 This is a separate function so you can redefine it for customization.
2342 You may need to redefine `file-name-sans-versions' as well."
2347 ;; This is used in various files.
2348 ;; The usage of backup-extract-version-start is not very clean,
2349 ;; but I can't see a good alternative, so as of now I am leaving it alone.
2351 "Given the name of a numeric backup file, FN, return the backup number.
2352 Uses the free variable `backup-extract-version-start', whose value should be
2353 the index in the name where the version number begins."
2359 ;; I believe there is no need to alter this behavior for VMS;
2360 ;; since backup files are not made on VMS, it should not get called.
2362 "Find a file name for a backup file FN, and suggestions for deletions.
2363 Value is a list whose car is the name for the backup file
2364 and whose cdr is a list of old versions to consider deleting now.
2365 If the value is nil, don't make a backup.
2366 Uses `backup-directory-alist' in the same way as does
2367 `make-backup-file-name'."
2369 ;; Run a handler for this function so that ange-ftp can refuse to do it.
2380 possibilities deserve-versions-p versions)
2383 base-versions
2386 possibilities)
2387 #'<)
2392 kept-old-versions
2393 kept-new-versions
2400 ;; Delete nothing if there is overflow
2401 ;; in the number of versions to keep.
2407 v))))))))))
2410 "Return number of names file FILENAME has."
2414 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
2415 This function returns a relative file name which is equivalent to FILENAME
2416 when used with that default directory as the default.
2417 If this is impossible (which can happen on MSDOS and Windows
2418 when the file name and directory use different drive names)
2419 then it returns FILENAME."
2424 ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
2425 ;; drive names, they can't be relative, so return the absolute name.
2430 filename
2437 ".."
2439 ;; Now ancestor is empty, or .., or ../.., etc.
2441 ;; We matched within FNAME's directory part.
2442 ;; Add the rest of FNAME onto ANCESTOR.
2446 ;; But don't bother with ANCESTOR if it would give us `./'.
2447 rest
2449 ;; We matched FNAME's directory equivalent.
2450 ancestor))))))
2451 \f
2453 "Save current buffer in visited file if modified. Versions described below.
2454 By default, makes the previous version into a backup file
2455 if previously requested or if this is the first save.
2457 to become a backup when the next save is done.
2459 unconditionally makes the previous version into a backup file.
2461 to become a backup when the next save is done,
2462 and unconditionally makes the previous version into a backup file.
2464 With argument of 0, never make the previous version into a backup file.
2466 If a file's name is FOO, the names of its numbered backup versions are
2467 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
2468 Numeric backups (rather than FOO~) will be made if value of
2469 `version-control' is not the atom `never' and either there are already
2470 numeric versions of the file being backed up, or `version-control' is
2471 non-nil.
2472 We don't want excessive versions piling up, so there are variables
2473 `kept-old-versions', which tells Emacs how many oldest versions to keep,
2474 and `kept-new-versions', which tells how many newest versions to keep.
2475 Defaults are 2 old versions and 2 new.
2476 `dired-kept-versions' controls dired's clean-directory (.) command.
2477 If `delete-old-versions' is nil, system will query user
2478 before trimming versions. Otherwise it does it silently.
2480 If `vc-make-backup-files' is nil, which is the default,
2481 no backup files are made for files managed by version control.
2482 (This is because the version control system itself records previous versions.)
2484 See the subroutine `basic-save-buffer' for more information."
2496 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
2497 Normally delete only if the file was written by this Emacs since
2498 the last real save, but optional arg FORCE non-nil means delete anyway."
2512 "Normal hook that is run after a buffer is saved to its file."
2518 "If non-nil, use this coding system for saving the buffer.
2519 More precisely, use this coding system in place of the
2520 value of `buffer-file-coding-system', when saving the buffer.
2521 Calling `write-region' for any purpose other than saving the buffer
2522 will still use `buffer-file-coding-system'; this variable has no effect
2529 "Save the current buffer in its visited file, if it has been modified.
2530 The hooks `write-contents-hooks', `local-write-file-hooks' and
2531 `write-file-hooks' get a chance to do the job of saving; if they do not,
2532 then the buffer is saved in the visited file file in the usual way.
2533 After saving the buffer, this function runs `after-save-hook'."
2536 ;; In an indirect buffer, save its base buffer instead.
2541 setmodes tempsetmodes)
2542 ;; On VMS, rename file and buffer to get rid of version number.
2547 ;; Strip VMS version number before save.
2550 ;; Construct a (unique) buffer name to correspond.
2555 ;; If buffer has no file name, ask user for one.
2562 filename))
2589 ;; If a hook returned t, file is already "written".
2590 ;; Otherwise, write it the usual way now.
2592 ;; Now we have saved the current buffer. Let's make sure
2593 ;; that buffer-file-coding-system is fixed to what
2594 ;; actually used for saving by binding it locally.
2604 ;; If the auto-save file was recent before this command,
2605 ;; delete it now.
2607 ;; Support VC `implicit' locking.
2612 ;; This does the "real job" of writing a buffer into its visited file
2613 ;; and making a backup file. This is what is normally done
2614 ;; but inhibited if one of write-file-hooks returns non-nil.
2615 ;; It returns a value to store in setmodes.
2635 buffer-file-name)))
2643 ;; If file is precious, write temp name, then rename it.
2644 ;; This requires write access to the containing dir,
2645 ;; which is why we don't try it if we don't have that access.
2647 tempname temp nogood i succeed
2651 ;; Find the temporary name to write under.
2658 "%s$tmp$%d"
2660 dir i))
2666 tempname nil realname
2667 buffer-file-truename)
2669 ;; If writing the temp file fails,
2670 ;; delete the temp file.
2675 ;; Since we have created an entirely new file
2676 ;; and renamed it, make sure it gets the
2677 ;; right permission bits set.
2679 ;; We succeeded in writing the temp file,
2680 ;; so rename it.
2682 ;; If file not writable, see if we can make it writable
2683 ;; temporarily while we write it.
2684 ;; But no need to do so if we have just backed it up
2685 ;; (setmodes is set) because that says we're superseding.
2687 ;; Change the mode back, after writing.
2691 buffer-file-name nil t buffer-file-truename)))
2692 setmodes))
2695 "Save some modified file-visiting buffers. Asks user about each one.
2696 Optional argument (the prefix) non-nil means save all with no questions.
2697 Optional second argument PRED determines which buffers are considered:
2698 If PRED is nil, all the file-visiting buffers are considered.
2699 If PRED is t, then certain non-file buffers will also be considered.
2700 If PRED is a zero-argument function, it indicates for each buffer whether
2701 to consider it or not when called with that buffer current."
2720 t
2739 ;; Return nil to ask about BUF again.
2740 nil)
2747 abbrev-file-name)))
2749 ;; Don't keep bothering user if he says no.
2751 t))))
2754 \f
2756 "Mark current buffer as unmodified, not needing to be saved.
2759 It is not a good idea to use this function in Lisp programs, because it
2760 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
2767 "Change whether this buffer is visiting its file read-only.
2768 With arg, set read-only iff arg is positive.
2769 If visiting file read-only and `view-read-only' is non-nil, enter view mode."
2775 ;; Toggle.
2787 "Insert contents of file FILENAME into buffer after point.
2788 Set mark after the inserted text.
2790 This function is meant for the user to run interactively.
2791 Don't call it from programs! Use `insert-file-contents' instead.
2792 \(Its calling sequence is different; see its documentation)."
2796 filename)))
2801 "Append the contents of the region to the end of file FILENAME.
2802 When called from a function, expects three arguments,
2803 START, END and FILENAME. START and END are buffer positions
2804 saying what text to write."
2809 "Return most recent backup file for FILENAME or nil if no backups exist."
2810 ;; `make-backup-file-name' will get us the right directory for
2811 ;; ordinary or numeric backups. It might create a directory for
2812 ;; backups as a side-effect, according to `backup-directory-alist'.
2819 tem)
2828 newest))
2831 "Rename current buffer to a similar name not already taken.
2832 This function is useful for creating multiple shell process buffers
2833 or multiple mail buffers, etc."
2841 ;; If the existing buffer name has a <NNN>,
2842 ;; which isn't part of the file name (if any),
2843 ;; then get rid of that.
2849 "Create the directory DIR and any nonexistent parent dirs.
2850 Interactively, the default choice of directory to create
2851 is the current default directory for file names.
2852 That is useful when you have visited a file in a nonexistent directory.
2854 Noninteractively, the second (optional) argument PARENTS says whether
2855 to create parent directories if they don't exist."
2858 nil nil)
2859 t))
2866 create-list)
2873 \f
2876 "Function to use to revert this buffer, or nil to do the default.
2877 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
2882 "Function to use to insert contents when reverting this buffer.
2883 Gets two args, first the nominal file name to use,
2884 and second, t if reading the auto-save file.
2889 "Normal hook for `revert-buffer' to run before reverting.
2890 If `revert-buffer-function' is used to override the normal revert
2894 "Normal hook for `revert-buffer' to run after reverting.
2895 Note that the hook value that it runs is the value that was in effect
2896 before reverting; that makes a difference if you have buffer-local
2897 hook functions.
2899 If `revert-buffer-function' is used to override the normal revert
2905 "Replace current buffer text with the text of the visited file on disk.
2906 This undoes all changes since the file was visited or saved.
2907 With a prefix argument, offer to revert from latest auto-save file, if
2908 that is more recent than the visited file.
2910 This command also works for special buffers that contain text which
2911 doesn't come from a file, but reflects some other data base instead:
2912 for example, Dired buffers and buffer-list buffers. In these cases,
2913 it reconstructs the buffer contents from the appropriate data base.
2915 When called from Lisp, the first argument is IGNORE-AUTO; only offer
2916 to revert from the auto-save file when this is nil. Note that the
2917 sense of this argument is the reverse of the prefix argument, for the
2918 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
2919 to nil.
2921 Optional second argument NOCONFIRM means don't ask for confirmation at
2922 all. (The local variable `revert-without-query', if non-nil, prevents
2923 confirmation.)
2925 Optional third argument PRESERVE-MODES non-nil means don't alter
2926 the files modes. Normally we reinitialize them using `normal-mode'.
2928 If the value of `revert-buffer-function' is non-nil, it is called to
2929 do all the work for this command. Otherwise, the hooks
2930 `before-revert-hook' and `after-revert-hook' are run at the beginning
2931 and the end, and if `revert-buffer-insert-file-contents-function' is
2932 non-nil, it is called instead of rereading visited file contents."
2934 ;; I admit it's odd to reverse the sense of the prefix argument, but
2935 ;; there is a lot of code out there which assumes that the first
2936 ;; argument should be t to avoid consulting the auto-save file, and
2937 ;; there's no straightforward way to encourage authors to notice a
2938 ;; reversal of the argument sense. So I'm just changing the user
2939 ;; interface, but leaving the programmatic interface the same.
2945 buffer-auto-save-file-name
2950 buffer-auto-save-file-name
2951 buffer-file-name)))
2962 found))
2964 file-name)))
2966 ;; If file was backed up but has changed since,
2967 ;; we shd make another backup.
2971 ;; Get rid of all undo records for this buffer.
2974 ;; Effectively copy the after-revert-hook status,
2975 ;; since after-find-file will clobber it.
2979 after-revert-hook)))
2981 ;; Don't make undo records for the reversion.
2985 file-name auto-save-p)
2988 ;; Bind buffer-file-name to nil
2989 ;; so that we don't try to lock the file.
2995 ;; Auto-saved file shoule be read without
2996 ;; any code conversion.
2998 coding-system-for-read)))
2999 ;; Note that this preserves point in an intelligent way.
3001 nil nil t))))
3002 ;; Recompute the truename in case changes in symlinks
3003 ;; have changed the truename.
3007 ;; Run after-revert-hook as it was before we reverted.
3015 t)))))
3018 "Visit file FILE, but get contents from its last auto-save file."
3019 ;; Actually putting the file name in the minibuffer should be used
3020 ;; only rarely.
3021 ;; Not just because users often use the default.
3045 ;; Keep the current buffer-file-coding-system.
3047 ;; Auto-saved file shoule be read without any code conversion.
3056 "Recover auto save files from a previous Emacs session.
3057 This command first displays a Dired buffer showing you the
3058 previous sessions that you could recover from.
3059 To choose one, move point to the proper line and then type C-c C-c.
3060 Then you'll be asked about a number of files to recover."
3074 ;; Each line starts with a space
3075 ;; so that Font Lock mode won't highlight the first character.
3084 "Choose one saved session to recover auto-save files from.
3085 This command is used in the special Dired buffer created by
3088 ;; Get the name of the session file to recover from.
3090 files
3096 ;; Read in the auto-save-list file.
3100 ;; Loop thru the text of that file
3101 ;; and get out the names of the files to recover.
3105 ;; This is a pair of lines for a non-file-visiting buffer.
3106 ;; Get the auto-save file name and manufacture
3107 ;; a "visited file name" from that.
3123 ;; This pair of lines is a file-visiting
3124 ;; buffer. Use the visited file name.
3134 ;; Ignore a file if its auto-save file does not exist now.
3138 ;; The file contains a pair of line for each auto-saved buffer.
3139 ;; The first line of the pair contains the visited file name
3140 ;; or is empty if the buffer was not visiting a file.
3141 ;; The second line is the auto-save file name.
3149 files
3155 "For each buffer in LIST, ask whether to kill it.
3156 LIST defaults to all existing live buffers."
3167 name
3172 \f
3174 "Toggle auto-saving of contents of current buffer.
3175 With prefix argument ARG, turn auto-saving on if positive, else off."
3180 ;; If auto-save is off because buffer has shrunk,
3181 ;; then toggling should turn it on.
3186 buffer-file-name
3188 ;; If -1 was stored here, to temporarily turn off saving,
3189 ;; turn it back on.
3195 buffer-auto-save-file-name)
3198 "Adjust current buffer's auto save file name for current conditions.
3199 Also rename any existing auto save file, if it was made in this session."
3211 "Return file name to use for auto-saves of current buffer.
3212 Does not consider `auto-save-visited-file-name' as that variable is checked
3213 before calling this function. You can redefine this for customization.
3214 See also `auto-save-file-name-p'."
3218 result)
3219 ;; Apply user-specified translations
3220 ;; to the file name.
3224 filename)))
3236 "#"
3240 ;; Deal with buffers that don't have any associated files. (Mail
3241 ;; mode tends to create a good number of these.)
3245 ;; Eliminate all slashes and backslashes by
3246 ;; replacing them with sequences that start with %.
3247 ;; Quote % also, to keep distinct names distinct.
3256 ;; Generate the file name.
3259 ;; Try a few alternative directories, to get one we can write it.
3266 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
3267 FILENAME should lack slashes. You can redefine this for customization."
3269 \f
3271 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
3272 The generated regexp will match a filename iff the filename
3273 matches that wildcard according to shell rules. Only wildcards known
3274 by `sh' are supported."
3276 ;; Copy the initial run of non-special characters.
3279 ;; If no special characters, we're almost done.
3283 j)
3285 result
3306 ;; Found "[^". Insert a `\0' character
3307 ;; (which cannot happen in a filename)
3308 ;; into the character class, so that `^'
3309 ;; is not the first character after `[',
3310 ;; and thus non-special in a regexp.
3315 ;; I don't think `]' can appear in a
3316 ;; character class in a wildcard, but
3317 ;; let's be general here.
3324 i
3337 ;; Shell wildcards should match the entire filename,
3338 ;; not its part. Make the regexp say so.
3340 \f
3343 "*Switches for `list-directory' to pass to `ls' for brief listing."
3349 "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)"
3351 "*Switches for `list-directory' to pass to `ls' for verbose listing."
3356 "Expand wildcard pattern PATTERN.
3357 This returns a list of file names which match the pattern.
3359 If PATTERN is written as an absolute relative file name,
3360 the values are absolute also.
3362 If PATTERN is written as a relative file name, it is interpreted
3363 relative to the current default directory, `default-directory'.
3364 The file names returned are normally also relative to the current
3365 default directory. However, if FULL is non-nil, they are absolute."
3368 ;; A list of all dirs that DIRPART specifies.
3369 ;; This can be more than one dir
3370 ;; if DIRPART contains wildcards.
3375 contents)
3380 ;; Filter out "." and ".."
3385 name))
3392 this-dir-contents)
3393 this-dir-contents)
3394 contents))))
3396 contents))
3399 "Display a list of files in or matching DIRNAME, a la `ls'.
3400 DIRNAME is globbed by the shell if necessary.
3401 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
3402 Actions controlled by variables `list-directory-brief-switches'
3403 and `list-directory-verbose-switches'."
3407 nil default-directory nil)
3408 pfx)))
3410 list-directory-brief-switches)))
3428 "Quote characters special to the shell in PATTERN, leave wildcards alone.
3430 PATTERN is assumed to represent a file-name wildcard suitable for the
3431 underlying filesystem. For Unix and GNU/Linux, the characters from the
3433 the parts of the pattern which don't include wildcard characters are
3434 quoted with double quotes.
3435 Existing quote characters in PATTERN are left alone, so you can pass
3436 PATTERN that already quotes some of the special characters."
3440 ;; DOS/Windows don't allow `"' in file names. So if the
3441 ;; argument has quotes, we can safely assume it is already
3442 ;; quoted by the caller.
3444 ;; We quote [&()#$'] in case their shell is a port of a
3445 ;; Unixy shell. We quote [,=+] because stock DOS and
3446 ;; Windows shells require that in some cases, such as
3447 ;; passing arguments to batch files that use positional
3448 ;; arguments like %1.
3450 pattern
3453 end)
3470 pattern))))
3476 ;; insert-directory
3477 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
3478 ;; FULL-DIRECTORY-P is nil.
3479 ;; The single line of output must display FILE's name as it was
3480 ;; given, namely, an absolute path name.
3481 ;; - must insert exactly one line for each file if WILDCARD or
3482 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
3483 ;; before the file lines, plus optional text after the file lines.
3484 ;; Lines are delimited by "\n", so filenames containing "\n" are not
3485 ;; allowed.
3486 ;; File lines should display the basename.
3487 ;; - must be consistent with
3488 ;; - functions dired-move-to-filename, (these two define what a file line is)
3489 ;; dired-move-to-end-of-filename,
3490 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
3491 ;; dired-insert-headerline
3492 ;; dired-after-subdir-garbage (defines what a "total" line is)
3493 ;; - variable dired-subdir-regexp
3495 "Insert directory listing for FILE, formatted according to SWITCHES.
3496 Leaves point after the inserted text.
3497 SWITCHES may be a string of options, or a list of strings.
3498 Optional third arg WILDCARD means treat FILE as shell wildcard.
3499 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
3500 switches do not contain `d', so that a full listing is expected.
3502 This works by running a directory listing program
3503 whose name is in the variable `insert-directory-program'.
3504 If WILDCARD, it also runs the shell specified by `shell-file-name'."
3505 ;; We need the directory in order to find the right handler.
3510 wildcard full-directory-p)
3516 default-file-name-coding-system)))
3517 ;; This is to control encoding the arguments in call-process.
3521 ;; Run ls in the directory of the file pattern we asked for
3528 shell-file-name nil t nil
3530 ""
3532 insert-directory-program
3533 " -d "
3535 switches
3537 " -- "
3538 ;; Quote some characters that have
3539 ;; special meanings in shells; but
3540 ;; don't quote the wildcards--we
3541 ;; want them to be special. We
3542 ;; also currently don't quote the
3543 ;; quoting characters in case
3544 ;; people want to use them
3545 ;; explicitly to quote wildcard
3546 ;; characters.
3548 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
3549 ;; directory if FILE is a symbolic link.
3551 insert-directory-program nil t nil
3555 ;; Split the switches at any spaces so we can
3556 ;; pass separate options as separate args.
3558 ;; Avoid lossage if FILE starts with `-'.
3566 file))))))))
3568 ;; We get here if `insert-directory-program' failed.
3569 ;; On non-Posix systems, we cannot open a directory, so
3570 ;; don't even try, because that will always result in
3571 ;; the ubiquitous "Access denied". Instead, show them
3572 ;; the `ls' command line and let them guess what went
3573 ;; wrong.
3578 insert-directory-program
3580 file result)
3581 ;; Unix. Access the file to get a suitable error.
3583 ;; Replace "total" with "used", to avoid confusion.
3584 ;; Add in the amount of free space.
3603 "Functions to call with no arguments to query about killing Emacs.
3604 If any of these functions returns nil, killing Emacs is cancelled.
3606 but `kill-emacs', the low level primitive, does not.
3610 "Offer to save each buffer, then kill this Emacs process.
3611 With prefix arg, silently save all file-visiting buffers, then kill."
3620 ;; process-list is not defined on VMS.
3622 active)
3627 val)
3633 ;; Query the user for other things, perhaps.
3636 \f
3637 ;; We use /: as a prefix to "quote" a file name
3638 ;; so that magic file name handlers will not apply to it.
3642 file-name-handler-alist))
3644 ;; We depend on being the last handler on the list,
3645 ;; so that anything else which does need handling
3646 ;; has been handled already.
3647 ;; So it is safe for us to inhibit *all* magic file name handlers.
3656 default-directory))
3657 ;; Get a list of the indices of the args which are file names.
3660 ;; The first four are special because they
3661 ;; return a file name. We want to include the /:
3662 ;; in the return value.
3663 ;; So just avoid stripping it in the first place.
3665 ;; `identity' means just return the first arg
3666 ;; as stripped of its quoting.
3677 ;; For all other operations, treat the first argument only
3678 ;; as the file name.
3680 ;; Copy ARGUMENTS so we can replace elements in it.
3682 ;; Strip off the /: from the file names that have this handler.
3690 "/"
3696 \f
3719 ;;; files.el ends here