| blob | d519f0411525a4c4cddc17a94a792a760f9ac563 |
1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985, 1986, 1987, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
4 ;; 1999, 2000, 2001, 2002, 2003, 2004, 2005 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 the auto-save file will not be deleted if the buffer is killed
46 when it has unsaved changes."
51 nil
52 "*Alist of abbreviations for file directories.
53 A list of elements of the form (FROM . TO), each meaning to replace
54 FROM with TO when it appears in a directory name. This replacement is
55 done when setting up the default directory of a newly visited file.
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 "Predicate that looks at a file name and decides whether to make backups.
141 "*Non-nil in a buffer means always offer to save buffer on exit.
142 Do so even if the buffer is not visiting a file.
143 Automatically local in all buffers."
149 "*Non-nil means find a file under alternative names, in existing buffers.
150 This means if any existing buffer is visiting the file you want
151 under another name, you get the existing buffer instead of a new buffer."
156 "*Non-nil means visit a file under its truename.
157 The truename of a file is found by chasing all links
158 both at the file level and at the levels of the containing directories."
163 nil
164 "*Specify which files should be reverted without query.
165 The value is a list of regular expressions.
166 If the file name matches one of these regular expressions,
167 then `revert-buffer' reverts the file without querying
168 if the file has changed on disk and you have not edited the buffer."
173 "The device number and file number of the file visited in the current buffer.
174 The value is a list of the form (FILENUM DEVNUM).
175 This pair of numbers uniquely identifies the file.
195 "The directory for writing temporary files."
201 "The directory for writing small temporary files.
202 If non-nil, this directory is used instead of `temporary-file-directory'
203 by programs that create small temporary files. This is for systems that
204 have fast storage with limited space, such as a RAM disk."
208 ;; The system null device. (Should reference NULL_DEVICE from C.)
225 "*Non-nil means protect against I/O errors while saving files.
226 Some modes set this non-nil in particular buffers.
228 This feature works by writing the new contents into a temporary file
229 and then renaming the temporary file to replace the original.
230 In this way, any I/O error in writing leaves the original untouched,
231 and there is never any instant where the file is nonexistent.
233 Note that this feature forces backups to be made by copying.
234 Yet, at the same time, saving a precious file
235 breaks any hard links between it and other files."
240 "*Control use of version numbers for backup files.
241 t means make numeric backup versions unconditionally.
242 nil means make them for files that have some already.
243 `never' means do not make them."
251 "*When cleaning directory, number of versions to keep."
257 "*If t, delete excess backup versions silently.
258 If nil, ask confirmation. Any other value prevents any trimming."
265 "*Number of oldest versions to keep when a new numbered backup is made."
270 "*Number of newest versions to keep when a new numbered backup is made.
271 Includes the new backup. Must be > 0"
276 "*Whether to add a newline automatically at the end of the file.
278 A value of t means do this only when the file is about to be saved.
279 A value of `visit' means do this right after the file is visited.
280 A value of `visit-save' means do it at both of those times.
281 Any other non-nil value means ask user whether to add a newline, when saving.
282 nil means don't add newlines.
284 Certain major modes set this locally to the value obtained
285 from `mode-require-final-newline'."
294 "*Whether to add a newline at end of file, in certain major modes.
295 Those modes set `require-final-newline' to this value when you enable them.
296 They do so because they are often used for files that are supposed
297 to end in newlines, and the question is how to arrange that.
299 A value of t means do this only when the file is about to be saved.
300 A value of `visit' means do this right after the file is visited.
301 A value of `visit-save' means do it at both of those times.
302 Any other non-nil value means ask user whether to add a newline, when saving.
304 nil means do not add newlines. That is a risky choice in this variable
305 since this value is used for modes for files that ought to have final newlines.
306 So if you set this to nil, you must explicitly check and add
307 a final newline, whenever you save a file that really needs one."
317 "*Non-nil says by default do auto-saving of every file-visiting buffer."
322 "*Non-nil says auto-save a buffer in the file it is visiting, when practical.
323 Normally auto-save files are written under other names."
329 ;; Don't put "\\2" inside expand-file-name, since it will be
330 ;; transformed to "/2" on DOS/Windows.
332 "*Transforms to apply to buffer file name before making auto-save file name.
333 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
334 REGEXP is a regular expression to match against the file name.
335 If it matches, `replace-match' is used to replace the
336 matching part with REPLACEMENT.
337 If the optional element UNIQUIFY is non-nil, the auto-save file name is
338 constructed by taking the directory part of the replaced file-name,
339 concatenated with the buffer file name with all directory separators
340 changed to `!' to prevent clashes. This will not work
341 correctly if your filesystem truncates the resulting name.
343 All the transforms in the list are tried, in the order they are listed.
344 When one transform applies, its result is final;
345 no further transforms are tried.
347 The default value is set up to put the auto-save file into the
348 temporary directory (see the variable `temporary-file-directory') for
349 editing a remote file.
351 On MS-DOS filesystems without long names this variable is always
352 ignored."
359 "*Non-nil means save word abbrevs too when files are saved.
360 If `silently', don't ask the user before saving."
365 "*Non-nil means allow `find-file' to visit directories.
366 To visit the directory, `find-file' runs `find-directory-functions'."
371 "*List of functions to try in sequence to visit a directory.
372 Each function is called with the directory name as the sole argument
373 and should return either a buffer or nil."
377 ;;;It is not useful to make this a local variable.
378 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
380 "List of functions to be called for `find-file' on nonexistent file.
381 These functions are called as soon as the error is detected.
382 Variable `buffer-file-name' is already set up.
388 ;;;It is not useful to make this a local variable.
389 ;;;(put 'find-file-hooks 'permanent-local t)
391 "List of functions to be called after a buffer is loaded from a file.
392 The buffer's local variables (if any) will have been processed before the
393 functions are called."
402 "List of functions to be called before writing out a buffer to a file.
403 If one of them returns non-nil, the file is considered already written
404 and the rest are not called.
405 These hooks are considered to pertain to the visited file.
406 So any buffer-local binding of this variable is discarded if you change
408 change the major mode.
410 This hook is not run if any of the functions in
411 `write-contents-functions' returns non-nil. Both hooks pertain
412 to how to save a buffer to file, for instance, choosing a suitable
413 coding system and setting mode bits. (See Info
414 node `(elisp)Saving Buffers'.) To perform various checks or
426 "List of functions to be called before writing out a buffer to a file.
427 If one of them returns non-nil, the file is considered already written
428 and the rest are not called and neither are the functions in
429 `write-file-functions'.
431 This variable is meant to be used for hooks that pertain to the
432 buffer's contents, not to the particular visited file; thus,
433 `set-visited-file-name' does not clear this variable; but changing the
434 major mode does clear it.
436 For hooks that _do_ pertain to the particular visited file, use
437 `write-file-functions'. Both this variable and
438 `write-file-functions' relate to how a buffer is saved to file.
439 To perform various checks or updates before the buffer is saved,
446 "*Control use of local variables in files you visit.
447 The value can be t, nil or something else.
448 A value of t means file local variables specifications are obeyed;
449 nil means they are ignored; anything else means query.
450 This variable also controls use of major modes specified in
451 a -*- line.
454 always obeys file local variable specifications and the -*- line,
455 and ignores this variable."
462 "Like `enable-local-variables' but meant for buffer-local bindings.
463 The meaningful values are nil and non-nil. The default is non-nil.
464 If a major mode sets this to nil, buffer-locally, then any local
465 variables list in the file will be ignored.
467 This variable does not affect the use of major modes
472 The value can be t, nil or something else.
473 A value of t means obey `eval' variables;
474 nil means ignore them; anything else means query."
480 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
489 "*Non-nil means buffers visiting files read-only do so in view mode.
490 In fact, this means that all read-only buffers normally have
491 View mode enabled, including buffers that are read-only because
492 you visit a file you cannot alter, and buffers you make read-only
499 "Provides support for ange-ftp host name completion.
500 Runs the usual ange-ftp hook, but only for completion operations."
501 ;; Having this here avoids the need to load ange-ftp when it's not
502 ;; really in use.
508 inhibit-file-name-handlers)))
513 "Convert a standard file's name to something suitable for the OS.
514 This means to guarantee valid names and perhaps to canonicalize
515 certain patterns.
517 This function's standard definition is trivial; it just returns
518 the argument. However, on Windows and DOS, replace invalid
519 characters. On DOS, make sure to obey the 8.3 limitations. On
520 Windows, turn Cygwin names into native names, and also turn
521 slashes into backslashes if the shell requires it (see
522 `w32-shell-dos-semantics').
524 See Info node `(elisp)Standard File Names' for more details."
525 filename)
528 "Read directory name, prompting with PROMPT and completing in directory DIR.
529 Value is not expanded---you must call `expand-file-name' yourself.
530 Default name to DEFAULT-DIRNAME if user exits with the same
531 non-empty string that was inserted by this function.
532 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
533 or just DIR if INITIAL is nil.)
534 If the user exits with an empty minibuffer, this function returns
535 an empty string. (This can only happen if the user erased the
536 pre-inserted contents or if `insert-default-directory' is nil.)
537 Fourth arg MUSTMATCH non-nil means require existing directory's name.
538 Non-nil and non-t means also require confirmation after completion.
539 Fifth arg INITIAL specifies text to start with.
540 DIR should be an absolute directory name. It defaults to
541 the value of `default-directory'."
546 dir))
547 mustmatch initial
550 \f
552 "Show the current default directory."
557 "Value of the CDPATH environment variable, as a list.
561 "Explode a search path into a list of directory names.
562 Directories are separated by occurrences of `path-separator'
563 \(which is colon in GNU and GNU-like systems)."
564 ;; We could use split-string here.
572 nil
577 cd-list)))
580 "Change current directory to given absolute file name DIR."
581 ;; Put the name into directory syntax now,
582 ;; because otherwise expand-file-name may give some bad results.
595 "Make DIR become the current buffer's default directory.
596 If your environment includes a `CDPATH' variable, try each one of
597 that list of directories (separated by occurrences of
598 `path-separator') when resolving a relative directory name.
599 The path separator is colon in GNU and GNU-like systems."
602 default-directory default-directory
618 cd-path)
619 nil))
623 "Load the Lisp file named FILE."
624 ;; This is a case where .elc makes a lot of sense.
631 "Search for FILENAME through PATH.
632 If found, return the absolute file name of FILENAME, with its suffixes;
633 otherwise return nil.
634 PATH should be a list of directories to look in, like the lists in
635 `exec-path' or `load-path'.
636 If SUFFIXES is non-nil, it should be a list of suffixes to append to
639 If non-nil, PREDICATE is used instead of `file-readable-p'.
640 PREDICATE can also be an integer to pass to the `access' system call,
641 in which case file-name handlers are ignored. This usage is deprecated.
643 For compatibility, PREDICATE can also be one of the symbols
644 `executable', `readable', `writable', or `exists', or a list of
645 one or more of those symbols."
656 "Do completion for file names passed to `locate-file'.
657 PATH-AND-SUFFIXES is a pair of lists (DIRECTORIES . SUFFIXES)."
680 "Search for COMMAND in `exec-path' and return the absolute file name.
681 Return nil if COMMAND is not found anywhere in `exec-path'."
682 ;; Use 1 rather than file-executable-p to better match the behavior of
683 ;; call-process.
687 "Load the library named LIBRARY.
688 This is an interface to the function `load'."
691 'locate-file-completion
696 "Test whether FILE specifies a location on a remote system.
697 Return an identification of the system if the location is indeed
698 remote. The identification of the system may comprise a method
699 to access the system and its hostname, amongst other things.
706 nil)))
709 "Copy the file FILE into a temporary file on this machine.
710 Returns the name of the local copy, or nil, if FILE is directly
711 accessible."
712 ;; This formerly had an optional BUFFER argument that wasn't used by
713 ;; anything.
717 nil)))
720 "Return the truename of FILENAME, which should be absolute.
721 The truename of a file name is found by chasing symbolic links
722 both at the level of the file and at the level of the directories
723 containing it, until no links are left at any level.
726 ;; COUNTER and PREV-DIRS are only used in recursive calls.
727 ;; COUNTER can be a cons cell whose car is the count of how many
728 ;; more links to chase before getting an error.
729 ;; PREV-DIRS can be a cons cell whose car is an alist
730 ;; of truenames we've just recently computed.
744 ;; For speed, remove the ange-ftp completion handler from the list.
745 ;; We know it's not needed here.
746 ;; For even more speed, do this only on the outermost call.
753 ;; andrewi@harlequin.co.uk - none of the following code (except for
754 ;; invoking the file-name handler) currently applies on Windows
755 ;; (ie. there are no native symlinks), but there is an issue with
756 ;; case differences being ignored by the OS, and short "8.3 DOS"
757 ;; name aliases existing for all files. (The short names are not
758 ;; reported by directory-files, but can be used to refer to files.)
759 ;; It seems appropriate for file-truename to resolve these issues in
760 ;; the most natural way, which on Windows is to call the function
761 ;; `w32-long-file-name' - this returns the exact name of a file as
762 ;; it is stored on disk (expanding short name aliases with the full
763 ;; name in the process).
766 ;; For file name that has a special handler, call handler.
767 ;; This is so that ange-ftp can save time by doing a no-op.
770 ;; If filename contains a wildcard, newname will be the old name.
772 ;; If filename exists, use the long name
776 ;; If this file directly leads to a link, process that iteratively
777 ;; so that we don't use lots of stack.
783 ;; For file name that has a special handler, call handler.
784 ;; This is so that ange-ftp can save time by doing a no-op.
787 done t)
789 target dirfile)
790 ;; Get the truename of the directory.
792 ;; If these are equal, we have the (or a) root directory.
794 ;; If this is the same dir we last got the truename for,
795 ;; save time--don't recalculate.
805 done t)
808 done t)
809 ;; Put it back on the file name.
811 ;; Is the file name the name of a link?
814 ;; Yes => chase that link, then start all over
815 ;; since the link may point to a directory name that uses links.
816 ;; We can't safely use expand-file-name here
817 ;; since target might look like foo/../bar where foo
818 ;; is itself a link. Instead, we handle . and .. above.
821 target
823 done nil)
824 ;; No, we are done!
826 filename))
829 "Chase links in FILENAME until a name that is not a link.
830 Unlike `file-truename', this does not check whether a parent
831 directory name is a symbolic link.
832 If the optional argument LIMIT is a number,
833 it means chase no more than that many links and then stop."
841 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
844 ;; Handle `..' by hand, since it needs to work in the
845 ;; target of any directory symlink.
846 ;; This code is not quite complete; it does not handle
847 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
851 ;; Chase links in the default dir of the symlink.
855 ;; Now find the parent of that dir.
859 newname))
862 "Change the encoding of FILE's name from CODING to NEW-CODING.
863 The value is a new name of FILE.
864 Signals a `file-already-exists' error if a file of the new name
865 already exists unless optional third argument OK-IF-ALREADY-EXISTS
866 is non-nil. A number as third arg means request confirmation if
867 the new name already exists. This is what happens in interactive
868 use with M-x."
871 default-file-name-coding-system))
873 from-coding to-coding)
875 ;; We provide the default coding only when it seems that
876 ;; the filename is correctly decoded by the default
877 ;; coding.
883 filename default-coding)
884 default-coding))
888 ;; We provide the default coding only when a user is going to
889 ;; change the encoding not from the default coding.
893 filename from-coding)))
896 filename from-coding default-coding)
897 default-coding)))
901 default-file-name-coding-system))
902 ;; FILE should have been decoded by DEFAULT-CODING.
906 ;; Suppress further encoding.
911 newname))
912 \f
914 "Select buffer BUFFER in another window.
915 If BUFFER does not identify an existing buffer, then this function
916 creates a buffer with that name.
918 When called from Lisp, BUFFER can be a buffer, a string \(a buffer name),
919 or nil. If BUFFER is nil, then this function chooses a buffer
920 using `other-buffer'.
921 Optional second arg NORECORD non-nil means
922 do not put this buffer at the front of the list of recently selected ones.
923 This function returns the buffer it switched to.
925 This uses the function `display-buffer' as a subroutine; see its
926 documentation for additional customization information."
929 ;; Don't let these interfere.
930 same-window-buffer-names same-window-regexps)
934 "Switch to buffer BUFFER in another frame.
935 Optional second arg NORECORD non-nil means
936 do not put this buffer at the front of the list of recently selected ones.
938 This uses the function `display-buffer' as a subroutine; see its
939 documentation for additional customization information."
942 same-window-buffer-names same-window-regexps)
950 "Add FUN to `minibuffer-setup-hook' while executing BODY.
951 BODY should use the minibuffer at most once.
952 Recursive uses of the minibuffer will not be affected."
958 ;; Clear out this hook so it does not interfere
959 ;; with any recursive minibuffer usage.
975 t))
978 "Edit file FILENAME.
979 Switch to a buffer visiting file FILENAME,
980 creating one if none already exists.
981 Interactively, the default if you just type RET is the current directory,
982 but the visited file name is available through the minibuffer history:
983 type M-n to pull it into the minibuffer.
985 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
986 expand wildcards (if any) and visit multiple files. You can
987 suppress wildcard expansion by setting `find-file-wildcards'.
989 To visit a file without any kind of conversion and without
998 "Edit file FILENAME, in another window.
999 May create a new window, or reuse an existing one.
1000 See the function `display-buffer'.
1002 Interactively, the default if you just type RET is the current directory,
1003 but the visited file name is available through the minibuffer history:
1004 type M-n to pull it into the minibuffer.
1006 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1007 expand wildcards (if any) and visit multiple files."
1018 "Edit file FILENAME, in another frame.
1019 May create a new frame, or reuse an existing one.
1020 See the function `display-buffer'.
1022 Interactively, the default if you just type RET is the current directory,
1023 but the visited file name is available through the minibuffer history:
1024 type M-n to pull it into the minibuffer.
1026 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1027 expand wildcards (if any) and visit multiple files."
1038 "Edit the existing file FILENAME.
1046 "Edit file FILENAME but don't allow changes.
1058 value))
1061 "Edit file FILENAME in another window but don't allow changes.
1073 value))
1076 "Edit file FILENAME in another frame but don't allow changes.
1088 value))
1091 "Find file FILENAME as a replacement for the file in the next window.
1092 This command does not select that window.
1094 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1095 expand wildcards (if any) and replace the file with multiple files."
1107 t))))
1115 "Find file FILENAME, select its buffer, kill previous buffer.
1116 If the current buffer now contains an empty file that you just visited
1117 \(presumably by mistake), use this command to visit the file you really want.
1119 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1120 expand wildcards (if any) and replace the file with multiple files."
1130 t)))
1151 ;; This prevents us from finding the same buffer
1152 ;; if we specified the same file again.
1156 ;; Likewise for dired buffers.
1160 ;; This executes if find-file gets an error
1161 ;; and does not really find anything.
1162 ;; We put things back as they were.
1163 ;; If find-file actually finds something, we kill obuf below.
1172 ;; We already asked; don't ask again.
1175 \f
1177 "Create a suitably named buffer for visiting FILENAME, and return it.
1178 FILENAME (sans directory) is used unchanged if that name is free;
1179 otherwise a string <2> or <3> or ... is appended to get an unused name."
1186 "Create and return a buffer with a name based on NAME.
1187 Choose the buffer's name using `generate-new-buffer-name'."
1191 "Regexp to match the automounter prefix in a directory name."
1199 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1201 removes automounter prefixes (see the variable `automount-dir-prefix')."
1202 ;; Get rid of the prefixes added by the automounter.
1209 ;; If any elt of directory-abbrev-alist matches this name,
1210 ;; abbreviate accordingly.
1216 ;; Compute and save the abbreviated homedir name.
1217 ;; We defer computing this until the first time it's needed, to
1218 ;; give time for directory-abbrev-alist to be set properly.
1219 ;; We include a slash at the end, to avoid spurious matches
1220 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1227 ;; If FILENAME starts with the abbreviated homedir,
1228 ;; make it start with `~' instead.
1230 ;; If the home dir is just /, don't change it.
1233 ;; MS-DOS root directories can come with a drive letter;
1234 ;; Novell Netware allows drive letters beyond `Z:'.
1244 filename))
1247 "*List of logical names for which visiting shouldn't save the true dirname.
1248 On VMS, when you visit a file using a logical name that searches a path,
1249 you may or may not want the visited file name to record the specific
1250 directory where the file was found. If you *do not* want that, add the logical
1251 name to this list as a string."
1256 "Return the buffer visiting file FILENAME (a string).
1257 This is like `get-file-buffer', except that it checks for any buffer
1258 visiting the same file, possibly under a different name.
1259 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1260 and others are ignored.
1261 If there is no such live buffer, return nil."
1275 found)
1280 number
1285 ;; Verify this buffer's file number
1286 ;; still belongs to its file.
1289 attributes)
1293 found))))
1294 \f
1296 "*Non-nil means file-visiting commands should handle wildcards.
1297 For example, if you specify `*.c', that would visit all the files
1298 whose names match the pattern."
1304 "*Non-nil means suppress warning messages for symlinked files.
1305 When nil, Emacs prints a warning when visiting a file that is already
1306 visited, but with a different name. Setting this option to t
1307 suppresses this warning."
1313 "Maximum size of file above which a confirmation is requested.
1314 When nil, never request confirmation."
1321 "Read file FILENAME into a buffer and return the buffer.
1322 If a buffer exists visiting FILENAME, return that one, but
1323 verify that the file has not changed since visited or saved.
1324 The buffer is not selected, just returned to the caller.
1325 Optional first arg NOWARN non-nil means suppress any warning messages.
1326 Optional second arg RAWFILE non-nil means the file is read literally.
1327 Optional third arg WILDCARDS non-nil means do wildcard processing
1328 and visit all the matching files. When wildcards are actually
1329 used and expanded, return a list of buffers that are visiting
1330 the various files."
1337 'find-directory-functions
1340 filename)))
1343 find-file-wildcards
1357 ;; Find any buffer for a file which has same truename.
1359 ;; Let user know if there is a buffer with the same truename.
1363 find-file-suppress-same-file-warnings
1367 ;; Optionally also find that buffer.
1370 ;; Check to see if the file looks uncommonly large.
1372 ;; Don't ask again if we already have the file or
1373 ;; if we're asked to be quiet.
1382 ;; We are using an existing buffer.
1388 ;; Certain files should be reverted automatically
1389 ;; if they have changed on disk and not in the buffer.
1397 found))
1407 "File %s changed on disk. Discard your edits? "
1412 "File %s changed on disk. Discard your edits in %s? "
1420 ;; Check if a formerly read-only file has become
1421 ;; writable and vice versa, but if the buffer agrees
1422 ;; with the new state of the file, that is ok too.
1429 buffer-file-name
1437 ;; It is confusing to ask whether to visit
1438 ;; non-literally if they have the file in
1439 ;; hexl-mode.
1443 "Save file and revisit literally? "
1448 rawfile truename number))
1450 "Discard your edits and revisit file literally? "
1453 rawfile truename number)
1457 "Revisit file literally? "
1460 rawfile truename number)
1463 ;; Return the buffer we are using.
1464 buf)
1465 ;; Create a new buffer.
1468 ;; find-file-noselect-1 may use a different buffer.
1470 rawfile truename number))))))
1476 ;; Needed in case we are re-visiting the file with a different
1477 ;; text representation.
1494 filename)))
1495 ;; Unconditionally set error
1505 filename)))
1506 ;; Run find-file-not-found-hooks until one returns non-nil.
1508 ;; If they fail too, set error.
1510 ;; Record the file's truename, and maybe use that as visited name.
1516 ;; On VMS, we may want to remember which directory in a search list
1517 ;; the file was found in.
1529 ;; Set buffer's default directory to that of the file.
1531 ;; Turn off backup files for certain file names. Since
1532 ;; this is a permanent local, the major mode won't eliminate it.
1545 \f
1547 "Like `insert-file-contents', but only reads in the file literally.
1548 A buffer may be modified in several ways after reading into the buffer,
1549 to Emacs features such as format decoding, character code
1550 conversion, `find-file-hook', automatic uncompression, etc.
1552 This function ensures that none of these modifications will take place."
1560 nil))
1563 inhibit-file-name-handlers))
1576 filename)))
1586 "Insert contents of file FILENAME into buffer after point with no conversion.
1588 This function is meant for the user to run interactively.
1589 Don't call it from programs! Use `insert-file-contents-literally' instead.
1590 \(Its calling sequence is different; see its documentation)."
1595 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
1600 "Visit file FILENAME with no conversion of any kind.
1601 Format conversion and character code conversion are both disabled,
1602 and multibyte characters are disabled in the resulting buffer.
1603 The major mode used is Fundamental mode regardless of the file name,
1604 and local variable specifications in the file are ignored.
1605 Automatic uncompression and adding a newline at the end of the
1606 file due to `require-final-newline' is also disabled.
1608 You cannot absolutely rely on this function to result in
1609 visiting the file literally. If Emacs already has a buffer
1610 which is visiting the file, you get the existing buffer,
1611 regardless of whether it was created literally or not.
1613 In a Lisp program, if you want to be sure of accessing a file's
1614 contents literally, you should create a temporary buffer and then read
1615 the file contents into it using `insert-file-contents-literally'."
1618 \f
1622 after-find-file-from-revert-buffer
1623 nomodes)
1624 "Called after finding a file and by the default revert function.
1625 Sets buffer mode, parses local variables.
1626 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
1627 error in reading the file. WARN non-nil means warn if there
1628 exists an auto-save file more recent than the visited file.
1629 NOAUTO means don't mess with auto-save mode.
1630 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER non-nil
1631 means this call was from `revert-buffer'.
1632 Fifth arg NOMODES non-nil means don't alter the file's modes.
1633 Finishes by calling the functions in `find-file-hook'
1634 unless NOMODES is non-nil."
1637 nil
1647 ;; No need to warn if buffer is auto-saved
1648 ;; under the name of the visited file.
1650 auto-save-visited-file-name))
1653 buffer-file-name))
1673 ;; Make people do a little extra work (C-x C-q)
1674 ;; before altering a backup file.
1677 ;; When a file is marked read-only,
1678 ;; make the buffer read-only even if root is looking at it.
1686 ;; If requested, add a newline at the end of the file.
1696 view-read-only
1702 "Eval BODY and turn any error into a FORMAT message.
1703 FORMAT can have a %s escape which will be replaced with the actual error.
1704 If `debug-on-error' is set, errors are not caught, so that you can
1705 debug them.
1706 Avoid using a large BODY since it is duplicated."
1715 "Choose the major mode for this buffer automatically.
1716 Also sets up any specified local variables of the file.
1717 Uses the visited file name, the -*- line, and the local variables spec.
1719 This function is called automatically from `find-file'. In that case,
1720 we may set up the file-specified mode and local variables,
1721 depending on the value of `enable-local-variables': if it is t, we do;
1722 if it is nil, we don't; otherwise, we query.
1723 In addition, if `local-enable-local-variables' is nil, we do
1724 not set local variables (though we do notice a mode specified with -*-.)
1726 `enable-local-variables' is ignored if you run `normal-mode' interactively,
1727 or from Lisp without specifying the optional argument FIND-FILE;
1728 in that case, this function acts as if `enable-local-variables' were t."
1740 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
1741 ;; c++-mode, java-mode and more) are added through autoload
1742 ;; directives in that file. That way is discouraged since it
1743 ;; spreads out the definition of the initial value.
1770 ;; Less common extensions come here
1771 ;; so more common ones above are found faster.
1810 ;; The list of archive file extensions should be in sync with
1811 ;; `auto-coding-alist' with `no-conversion' coding system.
1815 ;; Mailer puts message to be edited in
1816 ;; /tmp/Re.... or Message
1821 ;; some news reader is reported to use this
1830 ;; .emacs or .gnus or .viper following a directory delimiter in
1831 ;; Unix, MSDOG or VMS syntax.
1834 ;; _emacs following a directory delimiter
1835 ;; in MsDos syntax
1854 ;; Windows candidates may be opened case sensitively on Unix
1860 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
1862 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
1863 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
1864 ;; either user's dot-files or under /etc or some such
1866 ;; alas not all ~/.*rc files are like this
1867 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
1872 ;; this contains everything twice, with space and with colon :-(
1874 ;; Get rid of any trailing .n.m and try again.
1875 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
1876 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
1877 ;; Using mode nil rather than `ignore' would let the search continue
1878 ;; through this list (with the shortened name) rather than start over.
1880 ;; The following should come after the ChangeLog pattern
1881 ;; for the sake of ChangeLog.1, etc.
1882 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
1885 "Alist of filename patterns vs corresponding major mode functions.
1886 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
1887 \(NON-NIL stands for anything that is not nil; the value does not matter.)
1888 Visiting a file whose name matches REGEXP specifies FUNCTION as the
1889 mode function to use. FUNCTION will be called, unless it is nil.
1891 If the element has the form (REGEXP FUNCTION NON-NIL), then after
1892 calling FUNCTION (if it's not nil), we delete the suffix that matched
1893 REGEXP and search the list again for another match.
1895 If the file name matches `inhibit-first-line-modes-regexps',
1896 then `auto-mode-alist' is not processed.
1898 See also `interpreter-mode-alist', which detects executable script modes
1899 based on the interpreters they specify to run,
1903 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
1904 ;; and pike-mode) are added through autoload directives in that
1905 ;; file. That way is discouraged since it spreads out the
1906 ;; definition of the initial value.
1944 "Alist mapping interpreter names to major modes.
1945 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
1946 Each element looks like (INTERPRETER . MODE).
1947 The car of each element, a regular expression, is compared with
1948 the name of the interpreter specified in the first line.
1949 If it matches, mode MODE is selected.
1957 "List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
1958 When checking `inhibit-first-line-modes-regexps', we first discard
1964 "Regexp matching interpreters, for file mode determination.
1965 This regular expression is matched against the first line of a file
1966 to determine the file's mode in `set-auto-mode'. If it matches, the file
1967 is assumed to be interpreted by the interpreter matched by the second group
1968 of the regular expression. The mode is then determined as the mode
1973 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
1977 comment-re "*"
1980 . html-mode)
1981 ;; These two must come after html, because they are more general:
1986 . sgml-mode)
1989 "Alist of buffer beginnings vs. corresponding major mode functions.
1990 Each element looks like (REGEXP . FUNCTION). After visiting a file,
1991 if REGEXP matches the text at the beginning of the buffer,
1992 `normal-mode' will call FUNCTION rather than allowing `auto-mode-alist'
1993 to decide the buffer's major mode.
1995 If FUNCTION is nil, then it is not called. (That is a way of saying
1999 "Select major mode appropriate for current buffer.
2001 This checks for a -*- mode tag in the buffer's text, checks the
2002 interpreter that runs this file against `interpreter-mode-alist',
2003 compares the buffer beginning against `magic-mode-alist', or
2004 compares the filename against the entries in `auto-mode-alist'.
2006 It does not check for the `mode:' local variable in the
2007 Local Variables section of the file; for that, use `hack-local-variables'.
2009 If `enable-local-variables' is nil, this function does not check for a
2010 -*- mode tag.
2012 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2013 only set the major mode, if that would change it."
2014 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2016 ;; Find a -*- mode tag
2023 ;; Find all specifications for the `mode:' variable
2024 ;; and execute them left to right.
2036 modes)))
2037 ;; Simple -*-MODE-*- case.
2040 modes))))
2041 ;; If we found modes to use, invoke them now, outside the save-excursion.
2049 ;; continuing would call minor modes again, toggling them off
2051 ;; If we didn't, look for an interpreter specified in the first line.
2052 ;; As a special case, allow for things like "#!/bin/env perl", which
2053 ;; finds the interpreter anywhere in $PATH.
2059 ;; Map interpreter name to a mode, signalling we're done at the
2060 ;; same time.
2062 interpreter-mode-alist))
2063 ;; If we found an interpreter mode to use, invoke it now.
2066 ;; If we didn't, match the buffer beginning against magic-mode-alist.
2074 ;; Compare the filename against the entries in auto-mode-alist.
2077 ;; Remove backup-suffixes from file name.
2080 ;; Find first matching alist entry.
2093 ;; When `keep-mode-if-same' is set, we are working on behalf of
2094 ;; set-visited-file-name. In that case, if the major mode specified is the
2095 ;; same one we already have, don't actually reset it. We don't want to lose
2096 ;; minor modes such as Font Lock.
2098 "Apply MODE and return it.
2099 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2100 any aliases and compared to current major mode. If they are the
2101 same, do nothing and return nil."
2109 mode))
2112 "Find the -*- spec in the buffer.
2113 Call with point at the place to start searching from.
2114 If one is found, set point to the beginning
2115 and return the position of the end.
2116 Otherwise, return nil; point may be changed."
2119 ;; Don't look for -*- if this file name matches any
2120 ;; of the regexps in inhibit-first-line-modes-regexps.
2128 sufs)
2136 ;; If the file begins with "#!"
2137 ;; (exec interpreter magic), look
2138 ;; for mode frobs in the first two
2139 ;; lines. You cannot necessarily
2140 ;; put them in the first line of
2141 ;; such a file without screwing up
2142 ;; the interpreter invocation.
2153 end))))
2162 ;; If we fail to switch in the selected window,
2163 ;; it is probably a minibuffer or dedicated window.
2164 ;; So try another window.
2166 ;; Refrain from popping up frames since it can't
2167 ;; be undone by save-window-excursion.
2178 "Set local variables specified in the -*- line.
2179 Ignore any specification for `mode:' and `coding:';
2180 `set-auto-mode' should already have handled `mode:',
2181 `set-auto-coding' should already have handled `coding:'.
2182 If MODE-ONLY is non-nil, all we do is check whether the major mode
2183 is specified, returning t if it is specified."
2188 mode-specified
2191 ;; Parse the -*- line into the RESULT alist.
2192 ;; Also set MODE-SPECIFIED if we see a spec or `mode'.
2194 nil)
2196 ;; Simple form: "-*- MODENAME -*-". Already handled.
2198 nil)
2200 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
2201 ;; (last ";" is optional).
2206 ;; There used to be a downcase here,
2207 ;; but the manual didn't say so,
2208 ;; and people want to set var names that aren't all lc.
2215 ;; It is traditional to ignore
2216 ;; case when checking for `mode' in set-auto-mode,
2217 ;; so we must do that here as well.
2218 ;; That is inconsistent, but we're stuck with it.
2219 ;; The same can be said for `coding' in set-auto-coding.
2237 nil))))
2240 "Normal hook run after processing a file's local variables specs.
2241 Major modes can use this to examine user-specified local variables
2245 "Parse and put into effect this buffer's local variables spec.
2246 If MODE-ONLY is non-nil, all we do is check whether the major mode
2247 is specified, returning t if it is specified."
2249 ;; If MODE-ONLY is t, we check here for specifying the mode
2250 ;; in the -*- line. If MODE-ONLY is nil, we process
2251 ;; the -*- line here.
2255 ;; Look for "Local variables:" line in last page.
2266 ;; suffix is what comes after "local variables:" in its line.
2271 ;; prefix is what comes before "local variables:" in its line.
2276 beg)
2280 endpos
2286 nil t))
2296 ;; Discard the prefix.
2301 ;; Discard the suffix.
2309 ;; Find the variable name; strip whitespace.
2317 val)
2318 ;; Read the variable value.
2325 ;; Set the variable. "Variables" mode and eval are funny.
2331 mode-specified))
2336 ;; Get confirmation before setting these variables as locals in a file.
2361 ;; Don't wait for outline.el to be loaded, for the sake of outline-minor-mode.
2391 ;; This case is safe because the user gets to check it before it is used.
2395 "Non-nil if SYM could be dangerous as a file-local variable with value VAL.
2396 If VAL is nil or omitted, the question is whether any value might be
2397 dangerous."
2400 (and (string-match "-hooks?$\\|-functions?$\\|-forms?$\\|-program$\\|-command$\\|-predicate$\\|font-lock-keywords$\\|font-lock-keywords-[0-9]+$\\|font-lock-syntactic-keywords$\\|-frame-alist$\\|-mode-alist$\\|-map$\\|-map-alist$"
2403 ;; If the safe-local-variable property isn't t or nil,
2404 ;; then it must return non-nil on the proposed value to be safe.
2411 Add expressions to this list if you want Emacs to evaluate them, when
2412 they appear in an `eval' local variable specification, without first
2413 asking you for confirmation."
2430 "Return t if it is safe to eval EXP when it is found in a file."
2432 ;; Detect certain `put' expressions.
2438 ;; Only allow safe values of lisp-indent-hook;
2439 ;; not functions.
2442 ;; Allow expressions that the user requested.
2444 ;; Certain functions can be allowed with safe arguments
2445 ;; or can specify verification functions to try.
2453 ok))
2461 ok)))))))
2465 A few patterns are specified so that any name which matches one
2466 is considered risky."
2471 ;; We have already handled coding: tag in set-auto-coding.
2472 nil)
2474 nil)
2475 ;; "Setting" eval means either eval it or do nothing.
2476 ;; Likewise for setting hook variables.
2478 ;; Permit evalling a put of a harmless property.
2479 ;; if the args do nothing tricky.
2482 ;; Permit eval if not root and user says ok.
2491 ;; Ordinary variable, really set it.
2493 ;; Make sure the string has no text properties.
2494 ;; Some text properties can get evaluated in various ways,
2495 ;; so it is risky to put them on with a local variable list.
2500 \f
2503 However, the mode will not be changed if
2504 \(1) a local variables list or the `-*-' line specifies a major mode, or
2506 \ not suitable for ordinary files, or
2507 \(3) the new file name does not particularly specify any mode."
2512 "Change name of file visited in current buffer to FILENAME.
2513 The next time the buffer is saved it will go in the newly specified file.
2514 FILENAME nil or an empty string means make buffer not be visiting any file.
2515 Remember to delete the initial contents of the minibuffer
2516 if you wish to pass an empty string as the argument.
2518 The optional second argument NO-QUERY, if non-nil, inhibits asking for
2519 confirmation in the case where another buffer is already visiting FILENAME.
2521 The optional third argument ALONG-WITH-FILE, if non-nil, means that
2522 the old visited file has been renamed to the new name FILENAME."
2530 nil
2541 filename)))
2555 ;; If new-name == old-name, renaming would add a spurious <2>
2556 ;; and it's considered as a feature in rename-buffer.
2562 ;; Abbreviate the file names of the buffer.
2571 nil)))
2572 ;; write-file-functions is normally used for things like ftp-find-file
2573 ;; that visit things that are not local files as if they were files.
2574 ;; Changing to visit an ordinary local file instead should flush the hook.
2579 ;; If buffer was read-only because of version control,
2580 ;; that reason is gone now, so make it writable.
2584 ;; Turn off backup files for certain file names.
2585 ;; Since this is a permanent local, the major mode won't eliminate it.
2592 ;; If auto-save was not already on, turn it on if appropriate.
2596 ;; If auto save is on, start using a new name.
2597 ;; We deliberately don't rename or delete the old auto save
2598 ;; for the old visited file name. This is because perhaps
2599 ;; the user wants to save the new state and then compare with the
2600 ;; previous state from the auto save file.
2603 ;; Rename the old auto save file if any.
2610 ;; Update the major mode, if the file name determines it.
2612 ;; Don't change the mode if it is special.
2615 ;; Don't change the mode if the local variable list specifies it.
2621 "Write current buffer into file FILENAME.
2622 This makes the buffer visit that file, and marks it as not modified.
2624 If you specify just a directory name as FILENAME, that means to use
2625 the default file name but in that directory. You can also yank
2626 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
2628 If the buffer is not already visiting a file, the default file name
2629 for the output file is the buffer name.
2631 If optional second arg CONFIRM is non-nil, this function
2632 asks for confirmation before overwriting an existing file.
2633 Interactively, confirmation is required unless you supply a prefix argument."
2634 ;; (interactive "FWrite file: ")
2638 nil nil nil nil)
2642 default-directory)
2643 nil nil))
2647 ;; If arg is just a directory,
2648 ;; use the default file name, but in that directory.
2659 ;; Make buffer writable if file is writable.
2664 \f
2666 "Make a backup of the disk file visited by the current buffer, if appropriate.
2667 This is normally done before saving the buffer the first time.
2669 A backup may be done by renaming or by copying; see documentation of
2670 variable `make-backup-files'. If it's done by renaming, then the file is
2671 no longer accessible under its old name.
2673 The value is non-nil after a backup was made by renaming.
2674 It has the form (MODES . BACKUPNAME).
2675 MODES is the result of `file-modes' on the original
2676 file; this means that the caller, after saving the buffer, should change
2677 the modes of the new file to agree with the old modes.
2678 BACKUPNAME is the backup file name, which is the old file renamed."
2685 backup-info backupname targets setmodes)
2686 ;; If specified name is a symbolic link, chase it to the target.
2687 ;; Thus we make the backups in the directory where the real file is.
2692 ;; (if (file-directory-p buffer-file-name)
2693 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
2697 ;; If have old versions to maybe delete,
2698 ;; ask the user to confirm now, before doing anything.
2699 ;; But don't actually delete til later.
2704 real-file-name)))))
2706 ;; Actually write the back up file.
2709 ; (file-symlink-p buffer-file-name)
2710 backup-by-copying
2711 ;; Don't rename a suid or sgid file.
2726 ;; rename-file should delete old backup.
2730 ;; If trouble writing the backup, write it in ~.
2739 ;; Now delete the old versions, if desired.
2746 setmodes)
2753 ;; Create temp files with strict access rights. It's easy to
2754 ;; loosen them later, whereas it's impossible to close the
2755 ;; time-window of loose permissions otherwise.
2763 nil)
2765 ;; The file was somehow created by someone else between
2766 ;; `delete-file' and `copy-file', so let's try again.
2767 nil))
2768 ;; Reset the umask.
2774 "Return file NAME sans backup versions or strings.
2775 This is a separate procedure so your site-init or startup file can
2776 redefine it.
2777 If the optional argument KEEP-BACKUP-VERSION is non-nil,
2778 we do not remove backup version numbers, only true file version numbers."
2784 ;; VMS version number is (a) semicolon, optional
2785 ;; sign, zero or more digits or (b) period, option
2786 ;; sign, zero or more digits, provided this is the
2787 ;; second period encountered outside of the
2788 ;; device/directory part of the file name.
2791 name)
2801 "Return t if deleting FILE and rewriting it would preserve the owner."
2806 ;; Return t if the file doesn't exist, since it's true that no
2807 ;; information would be lost by an (attempted) delete and create.
2813 The extension, in a file name, is the part that follows the last `.',
2814 except that a leading `.', if any, doesn't count."
2817 directory)
2821 ;; Don't use expand-file-name here; if DIRECTORY is relative,
2822 ;; we don't want to expand it.
2825 filename))))
2829 The extension, in a file name, is the part that follows the last `.',
2830 except that a leading `.', if any, doesn't count.
2831 Return nil for extensionless file names such as `foo'.
2832 Return the empty string for file names such as `foo.'.
2834 If PERIOD is non-nil, then the returned value includes the period
2835 that delimits the extension, and if FILENAME has no extension,
2846 "A function to use instead of the default `make-backup-file-name'.
2847 A value of nil gives the default `make-backup-file-name' behaviour.
2849 This could be buffer-local to do something special for specific
2850 files. If you define it, you may need to change `backup-file-name-p'
2851 and `file-name-sans-versions' too.
2853 See also `backup-directory-alist'."
2859 "Alist of filename patterns and backup directory names.
2860 Each element looks like (REGEXP . DIRECTORY). Backups of files with
2861 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
2862 relative or absolute. If it is absolute, so that all matching files
2863 are backed up into the same directory, the file names in this
2864 directory will be the full name of the file backed up with all
2865 directory separators changed to `!' to prevent clashes. This will not
2866 work correctly if your filesystem truncates the resulting name.
2868 For the common case of all backups going into one directory, the alist
2870 directory name.
2872 If this variable is nil, or it fails to match a filename, the backup
2873 is made in the original file's directory.
2875 On MS-DOS filesystems without long names this variable is always
2876 ignored."
2882 "Default `backup-enable-predicate' function.
2883 Checks for files in `temporary-file-directory',
2884 `small-temporary-file-directory', and /tmp."
2887 ;; Directory is under temporary-file-directory.
2892 ;; Directory is under /tmp.
2897 0 nil
2899 ;; Directory is under small-temporary-file-directory.
2904 "Create the non-numeric backup file name for FILE.
2905 Normally this will just be the file's name with `~' appended.
2906 Customization hooks are provided as follows.
2908 If the variable `make-backup-file-name-function' is non-nil, its value
2909 should be a function which will be called with FILE as its argument;
2910 the resulting name is used.
2912 Otherwise a match for FILE is sought in `backup-directory-alist'; see
2913 the documentation of that variable. If the directory for the backup
2914 doesn't exist, it is created."
2928 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
2930 elt backup-directory)
2935 alist nil)))
2941 file
2945 ;; Normalize DOSish file names: downcase the drive
2946 ;; letter, if any, and replace the leading "x:" with
2947 ;; "/drive_x".
2950 ;; Replace any invalid file-name characters (for the
2951 ;; case of backing up remote files).
2955 "drive_"
2958 ""
2961 ;; Make the name unique by substituting directory
2962 ;; separators. It may not really be worth bothering about
2963 ;; doubling `!'s in the original name...
2968 backup-directory))
2975 "Return non-nil if FILE is a backup file name (numeric or not).
2976 This is a separate function so you can redefine it for customization.
2977 You may need to redefine `file-name-sans-versions' as well."
2982 ;; This is used in various files.
2983 ;; The usage of backup-extract-version-start is not very clean,
2984 ;; but I can't see a good alternative, so as of now I am leaving it alone.
2986 "Given the name of a numeric backup file, FN, return the backup number.
2987 Uses the free variable `backup-extract-version-start', whose value should be
2988 the index in the name where the version number begins."
2994 ;; I believe there is no need to alter this behavior for VMS;
2995 ;; since backup files are not made on VMS, it should not get called.
2997 "Find a file name for a backup file FN, and suggestions for deletions.
2998 Value is a list whose car is the name for the backup file
2999 and whose cdr is a list of old versions to consider deleting now.
3000 If the value is nil, don't make a backup.
3001 Uses `backup-directory-alist' in the same way as does
3002 `make-backup-file-name'."
3004 ;; Run a handler for this function so that ange-ftp can refuse to do it.
3008 ;; We don't support numbered backups on plain MS-DOS
3009 ;; when long file names are unavailable.
3019 possibilities deserve-versions-p versions)
3022 base-versions
3025 possibilities)
3026 #'<)
3031 kept-old-versions
3032 kept-new-versions
3039 ;; Delete nothing if there is overflow
3040 ;; in the number of versions to keep.
3046 v))))))))))
3049 "Return number of names file FILENAME has."
3052 ;; (defun file-relative-name (filename &optional directory)
3053 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
3054 ;; This function returns a relative file name which is equivalent to FILENAME
3055 ;; when used with that default directory as the default.
3056 ;; If this is impossible (which can happen on MSDOS and Windows
3057 ;; when the file name and directory use different drive names)
3058 ;; then it returns FILENAME."
3059 ;; (save-match-data
3060 ;; (let ((fname (expand-file-name filename)))
3061 ;; (setq directory (file-name-as-directory
3062 ;; (expand-file-name (or directory default-directory))))
3063 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
3064 ;; ;; drive names, they can't be relative, so return the absolute name.
3065 ;; (if (and (or (eq system-type 'ms-dos)
3066 ;; (eq system-type 'cygwin)
3067 ;; (eq system-type 'windows-nt))
3068 ;; (not (string-equal (substring fname 0 2)
3069 ;; (substring directory 0 2))))
3070 ;; filename
3071 ;; (let ((ancestor ".")
3072 ;; (fname-dir (file-name-as-directory fname)))
3073 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
3074 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
3075 ;; (setq directory (file-name-directory (substring directory 0 -1))
3076 ;; ancestor (if (equal ancestor ".")
3077 ;; ".."
3078 ;; (concat "../" ancestor))))
3079 ;; ;; Now ancestor is empty, or .., or ../.., etc.
3080 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
3081 ;; ;; We matched within FNAME's directory part.
3082 ;; ;; Add the rest of FNAME onto ANCESTOR.
3083 ;; (let ((rest (substring fname (match-end 0))))
3084 ;; (if (and (equal ancestor ".")
3085 ;; (not (equal rest "")))
3086 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
3087 ;; rest
3088 ;; (concat (file-name-as-directory ancestor) rest)))
3089 ;; ;; We matched FNAME's directory equivalent.
3090 ;; ancestor))))))
3093 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
3094 This function returns a relative file name which is equivalent to FILENAME
3095 when used with that default directory as the default.
3096 If FILENAME and DIRECTORY lie on different machines or on different drives
3097 on a DOS/Windows machine, it returns FILENAME on expanded form."
3101 default-directory))))
3107 ;; Test for different drives on DOS/Windows
3109 ;; Should `cygwin' really be included here? --stef
3112 ;; Test for different remote file system identification
3114 filename
3120 directory nil nil case-fold-search))
3122 directory nil nil case-fold-search))))
3125 ".."
3127 ;; Now ancestor is empty, or .., or ../.., etc.
3129 directory nil nil case-fold-search))
3130 ;; We matched within FILENAME's directory part.
3131 ;; Add the rest of FILENAME onto ANCESTOR.
3134 ;; But don't bother with ANCESTOR if it would give us `./'.
3135 rest
3137 ;; We matched FILENAME's directory equivalent.
3138 ancestor))))))
3139 \f
3141 "Save current buffer in visited file if modified. Variations are described below.
3142 By default, makes the previous version into a backup file
3143 if previously requested or if this is the first save.
3145 to become a backup when the next save is done.
3147 unconditionally makes the previous version into a backup file.
3149 to become a backup when the next save is done,
3150 and unconditionally makes the previous version into a backup file.
3152 With a numeric argument of 0, never make the previous version
3153 into a backup file.
3155 If a file's name is FOO, the names of its numbered backup versions are
3156 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
3157 Numeric backups (rather than FOO~) will be made if value of
3158 `version-control' is not the atom `never' and either there are already
3159 numeric versions of the file being backed up, or `version-control' is
3160 non-nil.
3161 We don't want excessive versions piling up, so there are variables
3162 `kept-old-versions', which tells Emacs how many oldest versions to keep,
3163 and `kept-new-versions', which tells how many newest versions to keep.
3164 Defaults are 2 old versions and 2 new.
3165 `dired-kept-versions' controls dired's clean-directory (.) command.
3166 If `delete-old-versions' is nil, system will query user
3167 before trimming versions. Otherwise it does it silently.
3169 If `vc-make-backup-files' is nil, which is the default,
3170 no backup files are made for files managed by version control.
3171 (This is because the version control system itself records previous versions.)
3173 See the subroutine `basic-save-buffer' for more information."
3186 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
3187 Normally delete only if the file was written by this Emacs since
3188 the last real save, but optional arg FORCE non-nil means delete anyway."
3202 "Normal hook that is run before a buffer is saved to its file."
3208 "Normal hook that is run after a buffer is saved to its file."
3214 "If non-nil, use this coding system for saving the buffer.
3215 More precisely, use this coding system in place of the
3216 value of `buffer-file-coding-system', when saving the buffer.
3217 Calling `write-region' for any purpose other than saving the buffer
3218 will still use `buffer-file-coding-system'; this variable has no effect
3225 "Save the current buffer in its visited file, if it has been modified.
3226 The hooks `write-contents-functions' and `write-file-functions' get a chance
3227 to do the job of saving; if they do not, then the buffer is saved in
3228 the visited file file in the usual way.
3229 Before and after saving the buffer, this function runs
3230 `before-save-hook' and `after-save-hook', respectively."
3233 ;; In an indirect buffer, save its base buffer instead.
3238 setmodes)
3239 ;; On VMS, rename file and buffer to get rid of version number.
3244 ;; Strip VMS version number before save.
3247 ;; Construct a (unique) buffer name to correspond.
3252 ;; If buffer has no file name, ask user for one.
3259 filename))
3285 ;; Support VC version backups.
3291 ;; If a hook returned t, file is already "written".
3292 ;; Otherwise, write it the usual way now.
3294 ;; Now we have saved the current buffer. Let's make sure
3295 ;; that buffer-file-coding-system is fixed to what
3296 ;; actually used for saving by binding it locally.
3306 ;; If the auto-save file was recent before this command,
3307 ;; delete it now.
3309 ;; Support VC `implicit' locking.
3314 ;; This does the "real job" of writing a buffer into its visited file
3315 ;; and making a backup file. This is what is normally done
3316 ;; but inhibited if one of write-file-functions returns non-nil.
3317 ;; It returns a value (MODES . BACKUPNAME), like backup-buffer.
3326 ;; This returns a value (MODES . BACKUPNAME), like backup-buffer.
3340 buffer-file-name)))
3348 ;; If file is precious, write temp name, then rename it.
3349 ;; This requires write access to the containing dir,
3350 ;; which is why we don't try it if we don't have that access.
3352 tempname succeed
3355 ;; Create temp files with strict access rights. It's easy to
3356 ;; loosen them later, whereas it's impossible to close the
3357 ;; time-window of loose permissions otherwise.
3362 ;; Try various temporary names.
3363 ;; This code follows the example of make-temp-file,
3364 ;; but it calls write-region in the appropriate way
3365 ;; for saving the buffer.
3372 tempname nil realname
3374 nil)
3376 ;; The file was somehow created by someone else between
3377 ;; `make-temp-name' and `write-region', let's try again.
3378 nil)
3380 ;; Reset the umask.
3382 ;; If we failed, restore the buffer's modtime.
3385 ;; Since we have created an entirely new file,
3386 ;; make sure it gets the right permission bits set.
3388 buffer-file-name)))
3389 ;; We succeeded in writing the temp file,
3390 ;; so rename it.
3392 ;; If file not writable, see if we can make it writable
3393 ;; temporarily while we write it.
3394 ;; But no need to do so if we have just backed it up
3395 ;; (setmodes is set) because that says we're superseding.
3397 ;; Change the mode back, after writing.
3404 buffer-file-name nil t buffer-file-truename)
3406 ;; If we get an error writing the new file, and we made
3407 ;; the backup by renaming, undo the backing-up.
3410 setmodes))
3413 "View the differences between BUFFER and its associated file.
3414 This requires the external program `diff' to be in your `exec-path'."
3429 ;; Display that message for 1 second so that user can read it
3430 ;; in the minibuffer.
3432 ;; return always nil, so that save-buffers-kill-emacs will not move
3433 ;; over to the next unsaved buffer when calling `d'.
3434 nil)
3437 '((?\C-r
3443 ;; Return nil to ask about BUF again.
3444 nil)
3446 (?d diff-buffer-with-file
3456 "Save some modified file-visiting buffers. Asks user about each one.
3457 You can answer `y' to save, `n' not to save, `C-r' to look at the
3458 buffer in question with `view-buffer' before deciding or `d' to
3459 view the differences using `diff-buffer-with-file'.
3461 Optional argument (the prefix) non-nil means save all with no questions.
3462 Optional second argument PRED determines which buffers are considered:
3463 If PRED is nil, all the file-visiting buffers are considered.
3464 If PRED is t, then certain non-file buffers will also be considered.
3465 If PRED is a zero-argument function, it indicates for each buffer whether
3466 to consider it or not when called with that buffer current.
3468 See `save-some-buffers-action-alist' if you want to
3469 change the additional actions you can take on files."
3473 files-done abbrevs-done)
3475 ;; First save any buffers that we're supposed to save unconditionally.
3476 ;; That way the following code won't ask about them.
3481 ;; Ask about those buffers that merit it,
3482 ;; and record the number thus saved.
3498 t
3511 save-some-buffers-action-alist))
3512 ;; Maybe to save abbrevs, and record whether
3513 ;; we either saved them or asked to.
3519 abbrev-file-name)))
3521 ;; Don't keep bothering user if he says no.
3526 "(Some special files were saved without asking)"
3528 \f
3530 "Mark current buffer as unmodified, not needing to be saved.
3533 It is not a good idea to use this function in Lisp programs, because it
3534 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
3541 "Change whether this buffer is visiting its file read-only.
3542 With arg, set read-only iff arg is positive.
3543 If visiting file read-only and `view-read-only' is non-nil, enter view mode."
3548 nil ; do nothing.
3549 ;; Toggle.
3556 ;; If view-mode is already active, `view-mode-enter' is a nop.
3568 "Insert contents of file FILENAME into buffer after point.
3569 Set mark after the inserted text.
3571 This function is meant for the user to run interactively.
3572 Don't call it from programs! Use `insert-file-contents' instead.
3573 \(Its calling sequence is different; see its documentation)."
3578 "Append the contents of the region to the end of file FILENAME.
3579 When called from a function, expects three arguments,
3580 START, END and FILENAME. START and END are buffer positions
3581 saying what text to write."
3586 "Return most recent backup file for FILENAME or nil if no backups exist."
3587 ;; `make-backup-file-name' will get us the right directory for
3588 ;; ordinary or numeric backups. It might create a directory for
3589 ;; backups as a side-effect, according to `backup-directory-alist'.
3596 tem)
3605 newest))
3608 "Rename current buffer to a similar name not already taken.
3609 This function is useful for creating multiple shell process buffers
3610 or multiple mail buffers, etc."
3618 ;; If the existing buffer name has a <NNN>,
3619 ;; which isn't part of the file name (if any),
3620 ;; then get rid of that.
3626 "Create the directory DIR and any nonexistent parent dirs.
3627 Interactively, the default choice of directory to create
3628 is the current default directory for file names.
3629 That is useful when you have visited a file in a nonexistent directory.
3631 Noninteractively, the second (optional) argument PARENTS says whether
3632 to create parent directories if they don't exist. Interactively,
3633 this happens by default."
3636 nil nil)
3637 t))
3638 ;; If default-directory is a remote directory,
3639 ;; make sure we find its make-directory handler.
3647 create-list)
3654 \f
3657 "Function to use to revert this buffer, or nil to do the default.
3658 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
3663 "Function to use to insert contents when reverting this buffer.
3664 Gets two args, first the nominal file name to use,
3665 and second, t if reading the auto-save file.
3670 "Function to check whether a non-file buffer needs reverting.
3671 This should be a function with one optional argument NOCONFIRM.
3672 Auto Revert Mode passes t for NOCONFIRM. The function should return
3673 non-nil if the buffer should be reverted. A return value of
3674 `fast' means that the need for reverting was not checked, but
3675 that reverting the buffer is fast. The buffer is current when
3676 this function is called.
3678 The idea behind the NOCONFIRM argument is that it should be
3679 non-nil if the buffer is going to be reverted without asking the
3680 user. In such situations, one has to be careful with potentially
3681 time consuming operations.
3683 For more information on how this variable is used by Auto Revert mode,
3687 "Normal hook for `revert-buffer' to run before reverting.
3688 If `revert-buffer-function' is used to override the normal revert
3692 "Normal hook for `revert-buffer' to run after reverting.
3693 Note that the hook value that it runs is the value that was in effect
3694 before reverting; that makes a difference if you have buffer-local
3695 hook functions.
3697 If `revert-buffer-function' is used to override the normal revert
3703 "Replace current buffer text with the text of the visited file on disk.
3704 This undoes all changes since the file was visited or saved.
3705 With a prefix argument, offer to revert from latest auto-save file, if
3706 that is more recent than the visited file.
3708 This command also works for special buffers that contain text which
3709 doesn't come from a file, but reflects some other data base instead:
3710 for example, Dired buffers and `buffer-list' buffers. In these cases,
3711 it reconstructs the buffer contents from the appropriate data base.
3713 When called from Lisp, the first argument is IGNORE-AUTO; only offer
3714 to revert from the auto-save file when this is nil. Note that the
3715 sense of this argument is the reverse of the prefix argument, for the
3716 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
3717 to nil.
3719 Optional second argument NOCONFIRM means don't ask for confirmation at
3720 all. (The local variable `revert-without-query', if non-nil, prevents
3721 confirmation.)
3723 Optional third argument PRESERVE-MODES non-nil means don't alter
3724 the files modes. Normally we reinitialize them using `normal-mode'.
3726 If the value of `revert-buffer-function' is non-nil, it is called to
3727 do all the work for this command. Otherwise, the hooks
3728 `before-revert-hook' and `after-revert-hook' are run at the beginning
3729 and the end, and if `revert-buffer-insert-file-contents-function' is
3730 non-nil, it is called instead of rereading visited file contents."
3732 ;; I admit it's odd to reverse the sense of the prefix argument, but
3733 ;; there is a lot of code out there which assumes that the first
3734 ;; argument should be t to avoid consulting the auto-save file, and
3735 ;; there's no straightforward way to encourage authors to notice a
3736 ;; reversal of the argument sense. So I'm just changing the user
3737 ;; interface, but leaving the programmatic interface the same.
3745 buffer-auto-save-file-name
3750 buffer-auto-save-file-name
3751 buffer-file-name)))
3762 found))
3764 file-name)))
3766 ;; If file was backed up but has changed since,
3767 ;; we shd make another backup.
3771 ;; Get rid of all undo records for this buffer.
3774 ;; Effectively copy the after-revert-hook status,
3775 ;; since after-find-file will clobber it.
3779 after-revert-hook)))
3781 ;; Don't make undo records for the reversion.
3785 file-name auto-save-p)
3788 "File %s no longer exists!"
3790 file-name))
3791 ;; Bind buffer-file-name to nil
3792 ;; so that we don't try to lock the file.
3798 ;; Auto-saved file shoule be read by Emacs'
3799 ;; internal coding.
3802 buffer-file-coding-system-explicit))))
3803 ;; This force after-insert-file-set-coding
3804 ;; (called from insert-file-contents) to set
3805 ;; buffer-file-coding-system to a proper value.
3808 ;; Note that this preserves point in an intelligent way.
3812 nil nil t))
3814 nil nil t)))))
3815 ;; Recompute the truename in case changes in symlinks
3816 ;; have changed the truename.
3820 ;; Run after-revert-hook as it was before we reverted.
3824 local-hook)
3827 t))))))
3830 "Recover the visited file--get contents from its last auto-save file."
3835 "Visit file FILE, but get contents from its last auto-save file."
3836 ;; Actually putting the file name in the minibuffer should be used
3837 ;; only rarely.
3838 ;; Not just because users often use the default.
3858 ;; Use insert-directory-safely, not insert-directory,
3859 ;; because these files might not exist. In particular,
3860 ;; FILE might not exist if the auto-save file was for
3861 ;; a buffer that didn't visit a file, such as "*mail*".
3862 ;; The code in v20.x called `ls' directly, so we need
3863 ;; to emulate what `ls' did in that case.
3869 ;; Keep the current buffer-file-coding-system.
3871 ;; Auto-saved file shoule be read with special coding.
3880 "Recover auto save files from a previous Emacs session.
3881 This command first displays a Dired buffer showing you the
3882 previous sessions that you could recover from.
3883 To choose one, move point to the proper line and then type C-c C-c.
3884 Then you'll be asked about a number of files to recover."
3894 auto-save-list-file-prefix)))
3895 t)
3904 ;; Each line starts with a space
3905 ;; so that Font Lock mode won't highlight the first character.
3914 "Choose one saved session to recover auto-save files from.
3915 This command is used in the special Dired buffer created by
3918 ;; Get the name of the session file to recover from.
3920 files
3926 ;; Read in the auto-save-list file.
3930 ;; Loop thru the text of that file
3931 ;; and get out the names of the files to recover.
3935 ;; This is a pair of lines for a non-file-visiting buffer.
3936 ;; Get the auto-save file name and manufacture
3937 ;; a "visited file name" from that.
3940 ;; If there is no auto-save file name, the
3941 ;; auto-save-list file is probably corrupted.
3956 ;; This pair of lines is a file-visiting
3957 ;; buffer. Use the visited file name.
3967 ;; Ignore a file if its auto-save file does not exist now.
3971 ;; The file contains a pair of line for each auto-saved buffer.
3972 ;; The first line of the pair contains the visited file name
3973 ;; or is empty if the buffer was not visiting a file.
3974 ;; The second line is the auto-save file name.
3982 files
3988 "Kill some buffers. Asks the user whether to kill each one of them.
3989 Non-interactively, if optional argument LIST is non-nil, it
3990 specifies the list of buffers to kill, asking for approval for each one."
4001 name
4006 \f
4008 "Toggle auto-saving of contents of current buffer.
4009 With prefix argument ARG, turn auto-saving on if positive, else off."
4014 ;; If auto-save is off because buffer has shrunk,
4015 ;; then toggling should turn it on.
4020 buffer-file-name
4022 ;; If -1 was stored here, to temporarily turn off saving,
4023 ;; turn it back on.
4029 buffer-auto-save-file-name)
4032 "Adjust current buffer's auto save file name for current conditions.
4033 Also rename any existing auto save file, if it was made in this session."
4045 "Return file name to use for auto-saves of current buffer.
4046 Does not consider `auto-save-visited-file-name' as that variable is checked
4047 before calling this function. You can redefine this for customization.
4048 See also `auto-save-file-name-p'."
4052 result uniq)
4053 ;; Apply user-specified translations
4054 ;; to the file name.
4058 filename)
4068 filename))))
4073 ;; We truncate the file name to DOS 8+3 limits
4074 ;; before doing anything else, because the regexp
4075 ;; passed to string-match below cannot handle
4076 ;; extensions longer than 3 characters, multiple
4077 ;; dots, and other atrocities.
4082 fn)
4087 "#"
4090 ;; Make sure auto-save file names don't contain characters
4091 ;; invalid for the underlying filesystem.
4093 ;; Don't modify remote (ange-ftp) filenames
4096 result))
4098 ;; Deal with buffers that don't have any associated files. (Mail
4099 ;; mode tends to create a good number of these.)
4103 file-name)
4104 ;; Eliminate all slashes and backslashes by
4105 ;; replacing them with sequences that start with %.
4106 ;; Quote % also, to keep distinct names distinct.
4115 ;; Generate the file name.
4121 ;; Try a few alternative directories, to get one we can
4122 ;; write it.
4128 ;; Don't modify remote (ange-ftp) filenames
4130 ;; The call to convert-standard-filename is in case
4131 ;; buffer-name includes characters not allowed by the
4132 ;; DOS/Windows filesystems. make-temp-file writes to the
4133 ;; file it creates, so we must fix the file name _before_
4134 ;; make-temp-file is called.
4136 fname))
4138 ;; make-temp-file creates the file,
4139 ;; but we don't want it to exist until we do an auto-save.
4143 file-name)))
4146 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
4147 FILENAME should lack slashes. You can redefine this for customization."
4149 \f
4151 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
4152 The generated regexp will match a filename iff the filename
4153 matches that wildcard according to shell rules. Only wildcards known
4154 by `sh' are supported."
4156 ;; Copy the initial run of non-special characters.
4159 ;; If no special characters, we're almost done.
4163 j)
4165 result
4186 ;; Found "[^". Insert a `\0' character
4187 ;; (which cannot happen in a filename)
4188 ;; into the character class, so that `^'
4189 ;; is not the first character after `[',
4190 ;; and thus non-special in a regexp.
4195 ;; I don't think `]' can appear in a
4196 ;; character class in a wildcard, but
4197 ;; let's be general here.
4204 i
4217 ;; Shell wildcards should match the entire filename,
4218 ;; not its part. Make the regexp say so.
4220 \f
4223 "*Switches for `list-directory' to pass to `ls' for brief listing."
4229 "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)"
4231 "*Switches for `list-directory' to pass to `ls' for verbose listing."
4236 "Expand wildcard pattern PATTERN.
4237 This returns a list of file names which match the pattern.
4239 If PATTERN is written as an absolute file name,
4240 the values are absolute also.
4242 If PATTERN is written as a relative file name, it is interpreted
4243 relative to the current default directory, `default-directory'.
4244 The file names returned are normally also relative to the current
4245 default directory. However, if FULL is non-nil, they are absolute."
4249 ;; A list of all dirs that DIRPART specifies.
4250 ;; This can be more than one dir
4251 ;; if DIRPART contains wildcards.
4256 contents)
4261 ;; Filter out "." and ".."
4266 name))
4273 this-dir-contents)
4274 this-dir-contents)
4275 contents))))
4277 contents)))
4280 "Display a list of files in or matching DIRNAME, a la `ls'.
4281 DIRNAME is globbed by the shell if necessary.
4282 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
4283 Actions controlled by variables `list-directory-brief-switches'
4284 and `list-directory-verbose-switches'."
4288 nil default-directory nil)
4289 pfx)))
4291 list-directory-brief-switches))
4292 buffer)
4305 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
4313 "Quote characters special to the shell in PATTERN, leave wildcards alone.
4315 PATTERN is assumed to represent a file-name wildcard suitable for the
4316 underlying filesystem. For Unix and GNU/Linux, the characters from the
4318 the parts of the pattern which don't include wildcard characters are
4319 quoted with double quotes.
4320 Existing quote characters in PATTERN are left alone, so you can pass
4321 PATTERN that already quotes some of the special characters."
4325 ;; DOS/Windows don't allow `"' in file names. So if the
4326 ;; argument has quotes, we can safely assume it is already
4327 ;; quoted by the caller.
4329 ;; We quote [&()#$'] in case their shell is a port of a
4330 ;; Unixy shell. We quote [,=+] because stock DOS and
4331 ;; Windows shells require that in some cases, such as
4332 ;; passing arguments to batch files that use positional
4333 ;; arguments like %1.
4335 pattern
4338 end)
4355 pattern))))
4362 "*Program to get the amount of free space on a file system.
4363 We assume the output has the format of `df'.
4364 The value of this variable must be just a command name or file name;
4365 if you want to specify options, use `directory-free-space-args'.
4367 A value of nil disables this feature.
4369 If the function `file-system-info' is defined, it is always used in
4370 preference to the program given by this variable."
4376 "*Options to use when running `directory-free-space-program'."
4381 "Return the mount of free space on directory DIR's file system.
4382 The result is a string that gives the number of free 1KB blocks,
4383 or nil if the system call or the program which retrieve the infornmation
4384 fail.
4386 This function calls `file-system-info' if it is available, or invokes the
4387 program specified by `directory-free-space-program' if that is non-nil."
4388 ;; Try to find the number of free blocks. Non-Posix systems don't
4389 ;; always have df, but might have an equivalent system call.
4398 nil t nil
4399 directory-free-space-args
4400 dir)))
4401 ;; Usual format is a header line followed by a line of
4402 ;; numbers.
4407 ;; Move to the end of the "available blocks" number.
4410 ;; Copy it into AVAILABLE.
4418 ;; insert-directory
4419 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
4420 ;; FULL-DIRECTORY-P is nil.
4421 ;; The single line of output must display FILE's name as it was
4422 ;; given, namely, an absolute path name.
4423 ;; - must insert exactly one line for each file if WILDCARD or
4424 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
4425 ;; before the file lines, plus optional text after the file lines.
4426 ;; Lines are delimited by "\n", so filenames containing "\n" are not
4427 ;; allowed.
4428 ;; File lines should display the basename.
4429 ;; - must be consistent with
4430 ;; - functions dired-move-to-filename, (these two define what a file line is)
4431 ;; dired-move-to-end-of-filename,
4432 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
4433 ;; dired-insert-headerline
4434 ;; dired-after-subdir-garbage (defines what a "total" line is)
4435 ;; - variable dired-subdir-regexp
4436 ;; - may be passed "--dired" as the first argument in SWITCHES.
4437 ;; Filename handlers might have to remove this switch if their
4438 ;; "ls" command does not support it.
4440 "Insert directory listing for FILE, formatted according to SWITCHES.
4441 Leaves point after the inserted text.
4442 SWITCHES may be a string of options, or a list of strings
4443 representing individual options.
4444 Optional third arg WILDCARD means treat FILE as shell wildcard.
4445 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
4446 switches do not contain `d', so that a full listing is expected.
4448 This works by running a directory listing program
4449 whose name is in the variable `insert-directory-program'.
4450 If WILDCARD, it also runs the shell specified by `shell-file-name'.
4452 When SWITCHES contains the long `--dired' option, this function
4453 treats it specially, for the sake of dired. However, the
4454 normally equivalent short `-D' option is just passed on to
4455 `insert-directory-program', as any other option."
4456 ;; We need the directory in order to find the right handler.
4461 wildcard full-directory-p)
4466 ;; Read the actual directory using `insert-directory-program'.
4467 ;; RESULT gets the status code.
4469 ;; putting text property `dired-filename, decode one
4470 ;; bunch by one to preserve that property.
4472 ;; This is to control encoding the arguments in call-process.
4476 default-file-name-coding-system))))
4479 ;; Run ls in the directory part of the file pattern
4480 ;; using the last component as argument.
4487 shell-file-name nil t nil
4488 "-c"
4490 ""
4492 insert-directory-program
4493 " -d "
4495 switches
4497 " -- "
4498 ;; Quote some characters that have
4499 ;; special meanings in shells; but
4500 ;; don't quote the wildcards--we want
4501 ;; them to be special. We also
4502 ;; currently don't quote the quoting
4503 ;; characters in case people want to
4504 ;; use them explicitly to quote
4505 ;; wildcard characters.
4507 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
4508 ;; directory if FILE is a symbolic link.
4510 insert-directory-program nil t nil
4514 ;; Split the switches at any spaces so we can
4515 ;; pass separate options as separate args.
4517 ;; Avoid lossage if FILE starts with `-'.
4525 file))))))))
4527 ;; If we got "//DIRED//" in the output, it means we got a real
4528 ;; directory listing, even if `ls' returned nonzero.
4529 ;; So ignore any errors.
4542 ;; The first time ls returns an error,
4543 ;; find the version numbers of ls,
4544 ;; and set insert-directory-ls-version
4545 ;; to > if it is more than 5.2.1, < if it is less, nil if it
4546 ;; is equal or if the info cannot be obtained.
4547 ;; (That can mean it isn't GNU ls.)
4557 comparison)
4573 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
4577 ;; If `insert-directory-program' failed, signal an error.
4579 ;; Delete the error message it may have output.
4581 ;; On non-Posix systems, we cannot open a directory, so
4582 ;; don't even try, because that will always result in
4583 ;; the ubiquitous "Access denied". Instead, show the
4584 ;; command line so the user can try to guess what went wrong.
4589 insert-directory-program
4591 file result)
4592 ;; Unix. Access the file to get a suitable error.
4599 ;; The following overshoots by one line for an empty
4600 ;; directory listed with "--dired", but without "-a"
4601 ;; switch, where the ls output contains a
4602 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
4603 ;; We take care of that case later.
4611 error-lines)
4612 ;; Find all the lines that are error messages,
4613 ;; and record the bounds of each one.
4620 ;; Now read the numeric positions of file names.
4627 error-lines))
4630 error-lines)))
4632 ;; End is followed by \n or by " -> ".
4634 ;; It seems that we can't trust ls's output as to
4635 ;; byte positions of filenames.
4641 ;; Take care of the case where the ls output contains a
4642 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
4643 ;; and we went one line too far back (see above).
4648 ;; Now decode what read if necessary.
4650 file-name-coding-system
4651 default-file-name-coding-system
4653 coding-no-eol
4654 val pos)
4658 ;; If no coding system is specified or detection is
4659 ;; requested, detect the coding.
4673 ;; Force no eol conversion on a file name, so
4674 ;; that CR is preserved.
4682 ;; Try to insert the amount of free space.
4685 ;; First find the line to put it on.
4689 ;; Replace "total" with "used", to avoid confusion.
4695 "Convert `ls --dired' file name position value POS to a buffer position.
4696 File name position values returned in ls --dired output
4697 count only stdout; they don't count the error messages sent to stderr.
4698 So this function converts to them to real buffer positions.
4699 ERROR-LINES is a list of buffer positions of error message lines,
4700 of the form (START END)."
4704 pos)
4708 "Insert directory listing for FILE, formatted according to SWITCHES.
4710 Like `insert-directory', but if FILE does not exist, it inserts a
4711 message to that effect instead of signaling an error."
4714 ;; Simulate the message printed by `ls'.
4718 "Functions to call with no arguments to query about killing Emacs.
4719 If any of these functions returns nil, killing Emacs is cancelled.
4721 but `kill-emacs', the low level primitive, does not.
4725 "How to ask for confirmation when leaving Emacs.
4726 If nil, the default, don't ask at all. If the value is non-nil, it should
4727 be a predicate function such as `yes-or-no-p'."
4735 "Offer to save each buffer, then kill this Emacs process.
4736 With prefix arg, silently save all file-visiting buffers, then kill."
4745 ;; process-list is not defined on VMS.
4747 active)
4756 ;; Query the user for other things, perhaps.
4761 \f
4762 ;; We use /: as a prefix to "quote" a file name
4763 ;; so that magic file name handlers will not apply to it.
4767 file-name-handler-alist))
4769 ;; We depend on being the last handler on the list,
4770 ;; so that anything else which does need handling
4771 ;; has been handled already.
4772 ;; So it is safe for us to inhibit *all* magic file name handlers.
4781 default-directory))
4782 ;; Get a list of the indices of the args which are file names.
4785 ;; The first six are special because they
4786 ;; return a file name. We want to include the /:
4787 ;; in the return value.
4788 ;; So just avoid stripping it in the first place.
4795 ;; `identity' means just return the first arg
4796 ;; not stripped of its quoting.
4798 ;; `add' means add "/:" to the result.
4800 ;; `quote' means add "/:" to buffer-file-name.
4802 ;; `unquote-then-quote' means set buffer-file-name
4803 ;; temporarily to unquoted filename.
4805 ;; List the arguments which are filenames.
4813 ;; For all other operations, treat the first argument only
4814 ;; as the file name.
4816 method
4817 ;; Copy ARGUMENTS so we can replace elements in it.
4821 ;; Strip off the /: from the file names that have it.
4829 "/"
4844 res))
4847 \f
4871 ;; arch-tag: bc68d3ea-19ca-468b-aac6-3a4a7766101f
4872 ;;; files.el ends here