| blob | 871a4b0548b241e03fd37f0d09b4135ef0f13718 |
1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985-1987, 1992-2013 Free Software Foundation, Inc.
5 ;; Maintainer: FSF
6 ;; Package: emacs
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software: you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation, either version 3 of the License, or
13 ;; (at your option) any later version.
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
23 ;;; Commentary:
25 ;; Defines most of Emacs's file- and directory-handling functions,
26 ;; including basic file visiting, backup generation, link handling,
27 ;; ITS-id version control, load- and write-hook handling, and the like.
29 ;;; Code:
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.
57 FROM is matched against directory names anchored at the first
61 FROM and TO should be equivalent names, which refer to the
62 same directory. Do not use `~' in the TO strings;
63 they should be ordinary absolute directory names.
65 Use this feature when you have directories which you normally refer to
66 via absolute symbolic links. Make TO the name of the link, and FROM
67 the name it is linked to."
76 "Non-nil means make a backup of a file the first time it is saved.
77 This can be done by renaming the file or by copying.
79 Renaming means that Emacs renames the existing file so that it is a
80 backup file, then writes the buffer into a new file. Any other names
81 that the old file had will now refer to the backup file. The new file
82 is owned by you and its group is defaulted.
84 Copying means that Emacs copies the existing file into the backup
85 file, then writes the buffer on top of the existing file. Any other
86 names that the old file had will now refer to the new (edited) file.
87 The file's owner and group are unchanged.
89 The choice of renaming or copying is controlled by the variables
90 `backup-by-copying', `backup-by-copying-when-linked',
91 `backup-by-copying-when-mismatch' and
92 `backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
96 ;; Do this so that local variables based on the file name
97 ;; are not overridden by the major mode.
99 "Non-nil means don't make a backup, regardless of the other parameters.
100 This variable is intended for use by making it local to a buffer.
105 "Non-nil means always use copying to create backup files.
106 See documentation of variable `make-backup-files'."
111 "Non-nil means use copying to create backups for files with multiple names.
112 This causes the alternate names to refer to the latest version as edited.
113 This variable is relevant only if `backup-by-copying' is nil."
118 "Non-nil means create backups by copying if this preserves owner or group.
119 Renaming may still be used (subject to control of other variables)
120 when it would not result in changing the owner or group of the file;
121 that is, for files which are owned by you and whose group matches
122 the default for a new file created there by you.
123 This variable is relevant only if `backup-by-copying' is nil."
130 "Non-nil means create backups by copying to preserve a privileged owner.
131 Renaming may still be used (subject to control of other variables)
132 when it would not result in changing the owner of the file or if the owner
133 has a user id greater than the value of this variable. This is useful
134 when low-numbered uid's are used for special system users (such as root)
135 that must maintain ownership of certain files.
136 This variable is relevant only if `backup-by-copying' and
137 `backup-by-copying-when-mismatch' are nil."
142 "Predicate that looks at a file name and decides whether to make backups.
146 "Non-nil in a buffer means always offer to save buffer on exit.
147 Do so even if the buffer is not visiting a file.
148 Automatically local in all buffers."
155 "Non-nil means find a file under alternative names, in existing buffers.
156 This means if any existing buffer is visiting the file you want
157 under another name, you get the existing buffer instead of a new buffer."
162 "Non-nil means visit a file under its truename.
163 The truename of a file is found by chasing all links
164 both at the file level and at the levels of the containing directories."
170 "Specify which files should be reverted without query.
171 The value is a list of regular expressions.
172 If the file name matches one of these regular expressions,
173 then `revert-buffer' reverts the file without querying
174 if the file has changed on disk and you have not edited the buffer."
179 "The device number and file number of the file visited in the current buffer.
180 The value is a list of the form (FILENUM DEVNUM).
181 This pair of numbers uniquely identifies the file.
195 "The directory for writing small temporary files.
196 If non-nil, this directory is used instead of `temporary-file-directory'
197 by programs that create small temporary files. This is for systems that
198 have fast storage with limited space, such as a RAM disk."
203 ;; The system null device. (Should reference NULL_DEVICE from C.)
230 "Non-nil means protect against I/O errors while saving files.
231 Some modes set this non-nil in particular buffers.
233 This feature works by writing the new contents into a temporary file
234 and then renaming the temporary file to replace the original.
235 In this way, any I/O error in writing leaves the original untouched,
236 and there is never any instant where the file is nonexistent.
238 Note that this feature forces backups to be made by copying.
239 Yet, at the same time, saving a precious file
240 breaks any hard links between it and other files.
242 This feature is advisory: for example, if the directory in which the
243 file is being saved is not writable, Emacs may ignore a non-nil value
244 of `file-precious-flag' and write directly into the file.
246 See also: `break-hardlink-on-save'."
251 "Non-nil means when saving a file that exists under several names
252 \(i.e., has multiple hardlinks), break the hardlink associated with
253 `buffer-file-name' and write to a new file, so that the other
254 instances of the file are not affected by the save.
256 If `buffer-file-name' refers to a symlink, do not break the symlink.
258 Unlike `file-precious-flag', `break-hardlink-on-save' is not advisory.
259 For example, if the directory in which a file is being saved is not
260 itself writable, then error instead of saving in some
261 hardlink-nonbreaking way.
263 See also `backup-by-copying' and `backup-by-copying-when-linked'."
269 "Control use of version numbers for backup files.
270 When t, make numeric backup versions unconditionally.
271 When nil, make them for files that have some already.
272 The value `never' means do not make them."
282 "When cleaning directory, number of versions to keep."
288 "If t, delete excess backup versions silently.
289 If nil, ask confirmation. Any other value prevents any trimming."
296 "Number of oldest versions to keep when a new numbered backup is made."
302 "Number of newest versions to keep when a new numbered backup is made.
303 Includes the new backup. Must be > 0"
309 "Whether to add a newline automatically at the end of the file.
311 A value of t means do this only when the file is about to be saved.
312 A value of `visit' means do this right after the file is visited.
313 A value of `visit-save' means do it at both of those times.
314 Any other non-nil value means ask user whether to add a newline, when saving.
315 A value of nil means don't add newlines.
317 Certain major modes set this locally to the value obtained
318 from `mode-require-final-newline'."
327 "Whether to add a newline at end of file, in certain major modes.
328 Those modes set `require-final-newline' to this value when you enable them.
329 They do so because they are often used for files that are supposed
330 to end in newlines, and the question is how to arrange that.
332 A value of t means do this only when the file is about to be saved.
333 A value of `visit' means do this right after the file is visited.
334 A value of `visit-save' means do it at both of those times.
335 Any other non-nil value means ask user whether to add a newline, when saving.
337 A value of nil means do not add newlines. That is a risky choice in this
338 variable since this value is used for modes for files that ought to have
339 final newlines. So if you set this to nil, you must explicitly check and
340 add a final newline, whenever you save a file that really needs one."
350 "Non-nil says by default do auto-saving of every file-visiting buffer."
356 ;; Don't put "\\2" inside expand-file-name, since it will be
357 ;; transformed to "/2" on DOS/Windows.
359 "Transforms to apply to buffer file name before making auto-save file name.
360 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
361 REGEXP is a regular expression to match against the file name.
362 If it matches, `replace-match' is used to replace the
363 matching part with REPLACEMENT.
364 If the optional element UNIQUIFY is non-nil, the auto-save file name is
365 constructed by taking the directory part of the replaced file-name,
366 concatenated with the buffer file name with all directory separators
367 changed to `!' to prevent clashes. This will not work
368 correctly if your filesystem truncates the resulting name.
370 All the transforms in the list are tried, in the order they are listed.
371 When one transform applies, its result is final;
372 no further transforms are tried.
374 The default value is set up to put the auto-save file into the
375 temporary directory (see the variable `temporary-file-directory') for
376 editing a remote file.
378 On MS-DOS filesystems without long names this variable is always
379 ignored."
387 "Non-nil means save word abbrevs too when files are saved.
388 If `silently', don't ask the user before saving."
393 "Non-nil means allow `find-file' to visit directories.
394 To visit the directory, `find-file' runs `find-directory-functions'."
399 "List of functions to try in sequence to visit a directory.
400 Each function is called with the directory name as the sole argument
401 and should return either a buffer or nil."
405 ;; FIXME: also add a hook for `(thing-at-point 'filename)'
407 "List of functions to try in sequence to get a file name at point.
408 Each function should return either nil or a file name found at the
409 location of point in the current buffer."
413 ;;;It is not useful to make this a local variable.
414 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
418 "List of functions to be called for `find-file' on nonexistent file.
419 These functions are called as soon as the error is detected.
420 Variable `buffer-file-name' is already set up.
423 ;;;It is not useful to make this a local variable.
424 ;;;(put 'find-file-hooks 'permanent-local t)
427 "List of functions to be called after a buffer is loaded from a file.
428 The buffer's local variables (if any) will have been processed before the
429 functions are called."
437 "List of functions to be called before writing out a buffer to a file.
438 If one of them returns non-nil, the file is considered already written
439 and the rest are not called.
440 These hooks are considered to pertain to the visited file.
441 So any buffer-local binding of this variable is discarded if you change
443 change the major mode.
445 This hook is not run if any of the functions in
446 `write-contents-functions' returns non-nil. Both hooks pertain
447 to how to save a buffer to file, for instance, choosing a suitable
448 coding system and setting mode bits. (See Info
449 node `(elisp)Saving Buffers'.) To perform various checks or
461 "List of functions to be called before writing out a buffer to a file.
462 If one of them returns non-nil, the file is considered already written
463 and the rest are not called and neither are the functions in
464 `write-file-functions'.
466 This variable is meant to be used for hooks that pertain to the
467 buffer's contents, not to the particular visited file; thus,
468 `set-visited-file-name' does not clear this variable; but changing the
469 major mode does clear it.
471 For hooks that _do_ pertain to the particular visited file, use
472 `write-file-functions'. Both this variable and
473 `write-file-functions' relate to how a buffer is saved to file.
474 To perform various checks or updates before the buffer is saved,
479 "Control use of local variables in files you visit.
480 The value can be t, nil, :safe, :all, or something else.
482 A value of t means file local variables specifications are obeyed
483 if all the specified variable values are safe; if any values are
484 not safe, Emacs queries you, once, whether to set them all.
485 \(When you say yes to certain values, they are remembered as safe.)
487 :safe means set the safe variables, and ignore the rest.
488 :all means set all variables, whether safe or not.
489 (Don't set it permanently to :all.)
490 A value of nil means always ignore the file local variables.
492 Any other value means always query you once whether to set them all.
493 \(When you say yes to certain values, they are remembered as safe, but
496 This variable also controls use of major modes specified in
497 a -*- line.
500 always obeys file local variable specifications and the -*- line,
501 and ignores this variable."
502 :risky t
511 "Non-nil means enable use of directory-local variables.
512 Some modes may wish to set this to nil to prevent directory-local
515 ;; This is an odd variable IMO.
516 ;; You might wonder why it is needed, when we could just do:
517 ;; (set (make-local-variable 'enable-local-variables) nil)
518 ;; These two are not precisely the same.
519 ;; Setting this variable does not cause -*- mode settings to be
520 ;; ignored, whereas setting enable-local-variables does.
521 ;; Only three places in Emacs use this variable: tar and arc modes,
522 ;; and rmail. The first two don't need it. They already use
523 ;; inhibit-local-variables-regexps, which is probably enough, and
524 ;; could also just set enable-local-variables locally to nil.
525 ;; Them setting it has the side-effect that dir-locals cannot apply to
526 ;; eg tar files (?). FIXME Is this appropriate?
527 ;; AFAICS, rmail is the only thing that needs this, and the only
528 ;; reason it uses it is for BABYL files (which are obsolete).
529 ;; These contain "-*- rmail -*-" in the first line, which rmail wants
530 ;; to respect, so that find-file on a BABYL file will switch to
531 ;; rmail-mode automatically (this is nice, but hardly essential,
532 ;; since most people are used to explicitly running a command to
533 ;; access their mail; M-x gnus etc). Rmail files may happen to
534 ;; contain Local Variables sections in messages, which Rmail wants to
535 ;; ignore. So AFAICS the only reason this variable exists is for a
536 ;; minor convenience feature for handling of an obsolete Rmail file format.
538 "Like `enable-local-variables' but meant for buffer-local bindings.
539 The meaningful values are nil and non-nil. The default is non-nil.
540 If a major mode sets this to nil, buffer-locally, then any local
541 variables list in a file visited in that mode will be ignored.
543 This variable does not affect the use of major modes specified
548 The value can be t, nil or something else.
549 A value of t means obey `eval' variables.
550 A value of nil means ignore them; anything else means query."
551 :risky t
557 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
566 "Non-nil means buffers visiting files read-only do so in view mode.
567 In fact, this means that all read-only buffers normally have
568 View mode enabled, including buffers that are read-only because
569 you visit a file you cannot alter, and buffers you make read-only
575 "History list of file names entered in the minibuffer.
577 Maximum length of the history list is determined by the value
579 \f
582 "Provides support for ange-ftp host name completion.
583 Runs the usual ange-ftp hook, but only for completion operations."
584 ;; Having this here avoids the need to load ange-ftp when it's not
585 ;; really in use.
591 inhibit-file-name-handlers)))
599 "Convert a standard file's name to something suitable for the OS.
600 This means to guarantee valid names and perhaps to canonicalize
601 certain patterns.
603 FILENAME should be an absolute file name since the conversion rules
604 sometimes vary depending on the position in the file name. E.g. c:/foo
605 is a valid DOS file name, but c:/bar/c:/foo is not.
607 This function's standard definition is trivial; it just returns
608 the argument. However, on Windows and DOS, replace invalid
609 characters. On DOS, make sure to obey the 8.3 limitations.
610 In the native Windows build, turn Cygwin names into native names,
611 and also turn slashes into backslashes if the shell requires it (see
612 `w32-shell-dos-semantics').
614 See Info node `(elisp)Standard File Names' for more details."
619 ;; Replace invalid filename characters with !
623 name))
631 "Read directory name, prompting with PROMPT and completing in directory DIR.
632 Value is not expanded---you must call `expand-file-name' yourself.
633 Default name to DEFAULT-DIRNAME if user exits with the same
634 non-empty string that was inserted by this function.
635 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
636 or just DIR if INITIAL is nil.)
637 If the user exits with an empty minibuffer, this function returns
638 an empty string. (This can only happen if the user erased the
639 pre-inserted contents or if `insert-default-directory' is nil.)
640 Fourth arg MUSTMATCH non-nil means require existing directory's name.
641 Non-nil and non-t means also require confirmation after completion.
642 Fifth arg INITIAL specifies text to start with.
643 DIR should be an absolute directory name. It defaults to
644 the value of `default-directory'."
649 dir))
650 mustmatch initial
653 \f
655 "Show the current default directory."
660 "Value of the CDPATH environment variable, as a list.
664 "Explode a search path into a list of directory names.
665 Directories are separated by `path-separator' (which is colon in
666 GNU and Unix systems). Substitute environment variables into the
667 resulting list of directory names. For an empty path element (i.e.,
668 a leading or trailing separator, or two adjacent separators), return
669 nil (meaning `default-directory') as the associated list element."
677 "Change current directory to given absolute file name DIR."
678 ;; Put the name into directory syntax now,
679 ;; because otherwise expand-file-name may give some bad results.
681 ;; We used to additionally call abbreviate-file-name here, for an
682 ;; unknown reason. Problem is that most buffers are setup
683 ;; without going through cd-absolute and don't call
684 ;; abbreviate-file-name on their default-directory, so the few that
685 ;; do end up using a superficially different directory.
697 "Make DIR become the current buffer's default directory.
698 If your environment includes a `CDPATH' variable, try each one of
699 that list of directories (separated by occurrences of
700 `path-separator') when resolving a relative directory name.
701 The path separator is colon in GNU and GNU-like systems."
704 ;; FIXME: There's a subtle bug in the completion below. Seems linked
705 ;; to a fundamental difficulty of implementing `predicate' correctly.
706 ;; The manifestation is that TAB may list non-directories in the case where
707 ;; those files also correspond to valid directories (if your cd-path is (A/
708 ;; B/) and you have A/a a file and B/a a directory, then both `a' and `a/'
709 ;; will be listed as valid completions).
710 ;; This is because `a' (listed because of A/a) is indeed a valid choice
711 ;; (which will lead to the use of B/a).
716 cd-path nil))
725 default-directory default-directory
726 t))))
736 "Load the Lisp file named FILE."
737 ;; This is a case where .elc makes a lot of sense.
744 "Search for FILENAME through PATH.
745 If found, return the absolute file name of FILENAME, with its suffixes;
746 otherwise return nil.
747 PATH should be a list of directories to look in, like the lists in
748 `exec-path' or `load-path'.
749 If SUFFIXES is non-nil, it should be a list of suffixes to append to
752 If non-nil, PREDICATE is used instead of `file-readable-p'.
754 This function will normally skip directories, so if you want it to find
755 directories, make sure the PREDICATE function returns `dir-ok' for them.
757 PREDICATE can also be an integer to pass to the `access' system call,
758 in which case file-name handlers are ignored. This usage is deprecated.
759 For compatibility, PREDICATE can also be one of the symbols
760 `executable', `readable', `writable', or `exists', or a list of
761 one or more of those symbols."
772 "Do completion for file names passed to `locate-file'."
775 ;; FIXME: maybe we should use completion-file-name-table instead,
776 ;; tho at least for `load', the arg is passed through
777 ;; substitute-in-file-name for historical reasons.
787 ;; If we have files like "foo.el" and "foo.elc", we could load one of
788 ;; them with "foo.el", "foo.elc", or "foo", where just "foo" is the
789 ;; preferred way. So if we list all 3, that gives a lot of redundant
790 ;; entries for the poor soul looking just for "foo". OTOH, sometimes
791 ;; the user does want to pay attention to the extension. We try to
792 ;; diffuse this tension by stripping the suffix, except when the
793 ;; result is a single element (i.e. usually we only list "foo" unless
794 ;; it's the only remaining element in the list, in which case we do
795 ;; list "foo", "foo.elc" and "foo.el").
806 string-file dir))
811 ;; Switching from names to names+fullnames creates a non-monotonicity
812 ;; which can cause problems with things like partial-completion.
813 ;; To minimize the problem, filter out completion-regexp-list, so that
814 ;; M-x load-library RET t/x.e TAB finds some files. Also remove elements
815 ;; from `names' which only matched `string' when they still had
816 ;; their suffix.
818 ;; Remove duplicates of the first element, so that we can easily check
819 ;; if `names' really only contains a single element.
822 ;; There's no more than one matching non-suffixed element, so expand
823 ;; the list by adding the suffixed elements as well.
826 string-dir names string-file pred action)))))
829 "Do completion for file names passed to `locate-file'.
830 PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
834 string nil action))
838 "Regexp of directory names which stop the search in `locate-dominating-file'.
839 Any directory whose name matches this regexp will be treated like
840 a kind of root directory by `locate-dominating-file' which will stop its search
841 when it bumps into it.
842 The default regexp prevents fruitless and time-consuming attempts to find
843 special files in directories in which filenames are interpreted as hostnames,
846 ;; (defun locate-dominating-files (file regexp)
847 ;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
848 ;; Stop at the first parent where a matching file is found and return the list
849 ;; of files that that match in this directory."
850 ;; (catch 'found
851 ;; ;; `user' is not initialized yet because `file' may not exist, so we may
852 ;; ;; have to walk up part of the hierarchy before we find the "initial UID".
853 ;; (let ((user nil)
854 ;; ;; Abbreviate, so as to stop when we cross ~/.
855 ;; (dir (abbreviate-file-name (file-name-as-directory file)))
856 ;; files)
857 ;; (while (and dir
858 ;; ;; As a heuristic, we stop looking up the hierarchy of
859 ;; ;; directories as soon as we find a directory belonging to
860 ;; ;; another user. This should save us from looking in
861 ;; ;; things like /net and /afs. This assumes that all the
862 ;; ;; files inside a project belong to the same user.
863 ;; (let ((prev-user user))
864 ;; (setq user (nth 2 (file-attributes dir)))
865 ;; (or (null prev-user) (equal user prev-user))))
866 ;; (if (setq files (condition-case nil
867 ;; (directory-files dir 'full regexp 'nosort)
868 ;; (error nil)))
869 ;; (throw 'found files)
870 ;; (if (equal dir
871 ;; (setq dir (file-name-directory
872 ;; (directory-file-name dir))))
873 ;; (setq dir nil))))
874 ;; nil)))
877 "Look up the directory hierarchy from FILE for a directory containing NAME.
878 Stop at the first parent directory containing a file NAME,
879 and return the directory. Return nil if not found.
880 Instead of a string, NAME can also be a predicate taking one argument
881 \(a directory) and returning a non-nil value if that directory is the one for
882 which we're looking."
883 ;; We used to use the above locate-dominating-files code, but the
884 ;; directory-files call is very costly, so we're much better off doing
885 ;; multiple calls using the code in here.
886 ;;
887 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
888 ;; `name' in /home or in /.
891 ;; `user' is not initialized outside the loop because
892 ;; `file' may not exist, so we may have to walk up part of the
893 ;; hierarchy before we find the "initial UID". Note: currently unused
894 ;; (user nil)
895 try)
898 ;; FIXME: Disabled this heuristic because it is sometimes
899 ;; inappropriate.
900 ;; As a heuristic, we stop looking up the hierarchy of
901 ;; directories as soon as we find a directory belonging
902 ;; to another user. This should save us from looking in
903 ;; things like /net and /afs. This assumes that all the
904 ;; files inside a project belong to the same user.
905 ;; (let ((prev-user user))
906 ;; (setq user (nth 2 (file-attributes file)))
907 ;; (and prev-user (not (equal user prev-user))))
920 "Search for COMMAND in `exec-path' and return the absolute file name.
921 Return nil if COMMAND is not found anywhere in `exec-path'."
922 ;; Use 1 rather than file-executable-p to better match the behavior of
923 ;; call-process.
927 "Load the Emacs Lisp library named LIBRARY.
928 This is an interface to the function `load'. LIBRARY is searched
929 for in `load-path', both with and without `load-suffixes' (as
930 well as `load-file-rep-suffixes').
932 See Info node `(emacs)Lisp Libraries' for more details.
933 See `load-file' for a different interface to `load'."
937 load-path
942 "Test whether FILE specifies a location on a remote system.
943 A file is considered remote if accessing it is likely to
944 be slower or less reliable than accessing local files.
946 `file-remote-p' never opens a new remote connection. It can
947 only reuse a connection that is already open.
949 Return nil or a string identifying the remote connection
950 \(ideally a prefix of FILE). Return nil if FILE is a relative
951 file name.
953 When IDENTIFICATION is nil, the returned string is a complete
954 remote identifier: with components method, user, and host. The
955 components are those present in FILE, with defaults filled in for
956 any that are missing.
958 IDENTIFICATION can specify which part of the identification to
959 return. IDENTIFICATION can be the symbol `method', `user',
960 `host', or `localname'. Any other value is handled like nil and
961 means to return the complete identification. The string returned
962 for IDENTIFICATION `localname' can differ depending on whether
963 there is an existing connection.
965 If CONNECTED is non-nil, return an identification only if FILE is
966 located on a remote system and a connection is established to
967 that remote system.
969 Tip: You can use this expansion of remote identifier components
970 to derive a new remote file name from an existing one. For
976 same remote identifier as FILE but expanded; a name such as
981 nil)))
983 ;; Probably this entire variable should be obsolete now, in favor of
984 ;; something Tramp-related (?). It is not used in many places.
985 ;; It's not clear what the best file for this to be in is, but given
986 ;; it uses custom-initialize-delay, it is easier if it is preloaded
987 ;; rather than autoloaded.
989 ;; This used to try various hard-coded places for remsh, rsh, and
990 ;; rcmd, trying to guess based on location whether "rsh" was
991 ;; "restricted shell" or "remote shell", but I don't see the point
992 ;; in this day and age. Almost everyone will use ssh, and have
993 ;; whatever command they want to use in PATH.
1000 "Program to use to execute commands on a remote host (e.g. ssh or rsh)."
1007 "Whether to use the remote file-name cache for read access.
1008 When `nil', never expire cached values (caution)
1009 When `t', never use the cache (safe, but may be slow)
1010 A number means use cached values for that amount of seconds since caching.
1012 The attributes of remote files are cached for better performance.
1013 If they are changed outside of Emacs's control, the cached values
1014 become invalid, and must be reread. If you are sure that nothing
1015 other than Emacs changes the files, you can set this variable to `nil'.
1017 If a remote file is checked regularly, it might be a good idea to
1018 let-bind this variable to a value less than the interval between
1019 consecutive checks. For example:
1021 (defun display-time-file-nonempty-p (file)
1022 (let ((remote-file-name-inhibit-cache (- display-time-interval 5)))
1023 (and (file-exists-p file)
1024 (< 0 (nth 7 (file-attributes (file-chase-links file)))))))"
1035 "Copy the file FILE into a temporary file on this machine.
1036 Returns the name of the local copy, or nil, if FILE is directly
1037 accessible."
1038 ;; This formerly had an optional BUFFER argument that wasn't used by
1039 ;; anything.
1043 nil)))
1046 "Return the truename of FILENAME.
1047 If FILENAME is not absolute, first expands it against `default-directory'.
1048 The truename of a file name is found by chasing symbolic links
1049 both at the level of the file and at the level of the directories
1050 containing it, until no links are left at any level.
1053 ;; COUNTER and PREV-DIRS are only used in recursive calls.
1054 ;; COUNTER can be a cons cell whose car is the count of how many
1055 ;; more links to chase before getting an error.
1056 ;; PREV-DIRS can be a cons cell whose car is an alist
1057 ;; of truenames we've just recently computed.
1071 ;; For speed, remove the ange-ftp completion handler from the list.
1072 ;; We know it's not needed here.
1073 ;; For even more speed, do this only on the outermost call.
1080 ;; andrewi@harlequin.co.uk - on Windows, there is an issue with
1081 ;; case differences being ignored by the OS, and short "8.3 DOS"
1082 ;; name aliases existing for all files. (The short names are not
1083 ;; reported by directory-files, but can be used to refer to files.)
1084 ;; It seems appropriate for file-truename to resolve these issues in
1085 ;; the most natural way, which on Windows is to call the function
1086 ;; `w32-long-file-name' - this returns the exact name of a file as
1087 ;; it is stored on disk (expanding short name aliases with the full
1088 ;; name in the process).
1091 ;; If filename exists, use its long name. If it doesn't
1092 ;; exist, the recursion below on the directory of filename
1093 ;; will drill down until we find a directory that exists,
1094 ;; and use the long name of that, with the extra
1095 ;; non-existent path components concatenated.
1100 ;; If this file directly leads to a link, process that iteratively
1101 ;; so that we don't use lots of stack.
1107 ;; For file name that has a special handler, call handler.
1108 ;; This is so that ange-ftp can save time by doing a no-op.
1111 done t)
1113 target dirfile)
1114 ;; Get the truename of the directory.
1116 ;; If these are equal, we have the (or a) root directory.
1120 ;; If this is the same dir we last got the truename for,
1121 ;; save time--don't recalculate.
1131 done t)
1134 done t)
1135 ;; Put it back on the file name.
1137 ;; Is the file name the name of a link?
1140 ;; Yes => chase that link, then start all over
1141 ;; since the link may point to a directory name that uses links.
1142 ;; We can't safely use expand-file-name here
1143 ;; since target might look like foo/../bar where foo
1144 ;; is itself a link. Instead, we handle . and .. above.
1147 target
1149 done nil)
1150 ;; No, we are done!
1152 filename))
1155 "Chase links in FILENAME until a name that is not a link.
1156 Unlike `file-truename', this does not check whether a parent
1157 directory name is a symbolic link.
1158 If the optional argument LIMIT is a number,
1159 it means chase no more than that many links and then stop."
1167 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
1170 ;; Handle `..' by hand, since it needs to work in the
1171 ;; target of any directory symlink.
1172 ;; This code is not quite complete; it does not handle
1173 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
1177 ;; Chase links in the default dir of the symlink.
1181 ;; Now find the parent of that dir.
1185 newname))
1187 ;; A handy function to display file sizes in human-readable form.
1188 ;; See http://en.wikipedia.org/wiki/Kibibyte for the reference.
1190 "Produce a string showing FILE-SIZE in human-readable form.
1192 Optional second argument FLAVOR controls the units and the display format:
1194 If FLAVOR is nil or omitted, each kilobyte is 1024 bytes and the produced
1196 If FLAVOR is `si', each kilobyte is 1000 bytes and the produced suffixes
1198 If FLAVOR is `iec', each kilobyte is 1024 bytes and the produced suffixes
1201 1024.0
1204 ;; none, kilo, mega, giga, tera, peta, exa, zetta, yotta
1210 "%.1f%s%s"
1212 file-size
1214 "K"
1219 "Create a temporary file.
1220 The returned file name (created by appending some random characters at the end
1221 of PREFIX, and expanding against `temporary-file-directory' if necessary),
1222 is guaranteed to point to a newly created empty file.
1223 You can then use `write-region' to write new data into the file.
1225 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1227 If SUFFIX is non-nil, add that at the end of the file name."
1229 file)
1232 ;; Create temp files with strict access rights. It's easy to
1233 ;; loosen them later, whereas it's impossible to close the
1234 ;; time-window of loose permissions otherwise.
1242 temporary-file-directory)
1244 temporary-file-directory))))
1250 nil)
1252 ;; the file was somehow created by someone else between
1253 ;; `make-temp-name' and `write-region', let's try again.
1254 nil)
1255 file)
1256 ;; Reset the umask.
1260 "Change the encoding of FILE's name from CODING to NEW-CODING.
1261 The value is a new name of FILE.
1262 Signals a `file-already-exists' error if a file of the new name
1263 already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
1264 is non-nil. A number as fourth arg means request confirmation if
1265 the new name already exists. This is what happens in interactive
1266 use with M-x."
1269 default-file-name-coding-system))
1271 from-coding to-coding)
1273 ;; We provide the default coding only when it seems that
1274 ;; the filename is correctly decoded by the default
1275 ;; coding.
1281 filename default-coding)
1282 default-coding))
1286 ;; We provide the default coding only when a user is going to
1287 ;; change the encoding not from the default coding.
1291 filename from-coding)))
1294 filename from-coding default-coding)
1295 default-coding)))
1299 default-file-name-coding-system))
1300 ;; FILE should have been decoded by DEFAULT-CODING.
1304 ;; Suppress further encoding.
1309 newname))
1310 \f
1312 "Whether confirmation is requested before visiting a new file or buffer.
1313 If nil, confirmation is not requested.
1314 If the value is `after-completion', confirmation is only
1315 requested if the user called `minibuffer-complete' right before
1316 `minibuffer-complete-and-exit'.
1317 Any other non-nil value means to request confirmation.
1319 This affects commands like `switch-to-buffer' and `find-file'."
1327 "Whether to request confirmation before visiting a new file or buffer.
1328 The variable `confirm-nonexistent-file-or-buffer' determines the
1329 return value, which may be passed as the REQUIRE-MATCH arg to
1330 `read-buffer' or `find-file-read-args'."
1338 "Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
1339 BODY should use the minibuffer at most once.
1340 Recursive uses of the minibuffer are unaffected (FUN is not
1341 called additional times).
1343 This macro actually adds an auxiliary function that calls FUN,
1344 rather than FUN itself, to `minibuffer-setup-hook'."
1350 ;; Clear out this hook so it does not interfere
1351 ;; with any recursive minibuffer usage.
1362 t))
1365 "Edit file FILENAME.
1366 Switch to a buffer visiting file FILENAME,
1367 creating one if none already exists.
1368 Interactively, the default if you just type RET is the current directory,
1369 but the visited file name is available through the minibuffer history:
1370 type M-n to pull it into the minibuffer.
1372 You can visit files on remote machines by specifying something
1373 like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
1374 also visit local files as a different user by specifying
1375 /sudo::FILE for the file name.
1376 See the Info node `(tramp)Filename Syntax' in the Tramp Info
1377 manual, for more about this.
1379 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1380 expand wildcards (if any) and visit multiple files. You can
1381 suppress wildcard expansion by setting `find-file-wildcards' to nil.
1383 To visit a file without any kind of conversion and without
1394 "Edit file FILENAME, in another window.
1397 an existing one. See the function `display-buffer'.
1399 Interactively, the default if you just type RET is the current directory,
1400 but the visited file name is available through the minibuffer history:
1401 type M-n to pull it into the minibuffer.
1403 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1404 expand wildcards (if any) and visit multiple files."
1417 "Edit file FILENAME, in another frame.
1420 an existing one. See the function `display-buffer'.
1422 Interactively, the default if you just type RET is the current directory,
1423 but the visited file name is available through the minibuffer history:
1424 type M-n to pull it into the minibuffer.
1426 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1427 expand wildcards (if any) and visit multiple files."
1440 "Edit the existing file FILENAME.
1442 file names with wildcards."
1459 value))
1462 "Edit file FILENAME but don't allow changes.
1471 "Edit file FILENAME in another window but don't allow changes.
1480 "Edit file FILENAME in another frame but don't allow changes.
1489 "Find file FILENAME as a replacement for the file in the next window.
1490 This command does not select that window.
1494 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1495 expand wildcards (if any) and replace the file with multiple files."
1506 "Find alternate file: " file-dir nil
1508 t))))
1515 ;; Defined and used in buffer.c, but not as a DEFVAR_LISP.
1517 "Hook run when a buffer is killed.
1518 The buffer being killed is current while the hook is running.
1519 See `kill-buffer'.
1521 Note: Be careful with let-binding this hook considering it is
1525 "Find file FILENAME, select its buffer, kill previous buffer.
1526 If the current buffer now contains an empty file that you just visited
1527 \(presumably by mistake), use this command to visit the file you really want.
1531 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1532 expand wildcards (if any) and replace the file with multiple files.
1534 If the current buffer is an indirect buffer, or the base buffer
1535 for one or more indirect buffers, the other buffer(s) are not
1536 killed."
1545 "Find alternate file: " file-dir nil
1547 t)))
1559 ;; Run `kill-buffer-hook' here. It needs to happen before
1560 ;; variables like `buffer-file-name' etc are set to nil below,
1561 ;; because some of the hooks that could be invoked
1562 ;; (e.g., `save-place-to-alist') depend on those variables.
1563 ;;
1564 ;; Note that `kill-buffer-hook' is not what queries whether to
1565 ;; save a modified buffer visiting a file. Rather, `kill-buffer'
1566 ;; asks that itself. Thus, there's no need to temporarily do
1567 ;; `(set-buffer-modified-p nil)' before running this hook.
1569 ;; Okay, now we can end-of-life the old buffer.
1576 ;; This prevents us from finding the same buffer
1577 ;; if we specified the same file again.
1581 ;; Likewise for dired buffers.
1585 ;; This executes if find-file gets an error
1586 ;; and does not really find anything.
1587 ;; We put things back as they were.
1588 ;; If find-file actually finds something, we kill obuf below.
1597 ;; We already ran these; don't run them again.
1600 \f
1602 "Create a suitably named buffer for visiting FILENAME, and return it.
1603 FILENAME (sans directory) is used unchanged if that name is free;
1604 otherwise a string <2> or <3> or ... is appended to get an unused name.
1605 Spaces at the start of FILENAME (sans directory) are removed."
1614 "Create and return a buffer with a name based on NAME.
1615 Choose the buffer's name using `generate-new-buffer-name'."
1619 "Regexp to match the automounter prefix in a directory name."
1628 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1630 home directory is a root directory) and removes automounter prefixes
1631 \(see the variable `automount-dir-prefix')."
1632 ;; Get rid of the prefixes added by the automounter.
1639 ;; Avoid treating /home/foo as /home/Foo during `~' substitution.
1640 ;; To fix this right, we need a `file-name-case-sensitive-p'
1641 ;; function, but we don't have that yet, so just guess.
1644 ;; If any elt of directory-abbrev-alist matches this name,
1645 ;; abbreviate accordingly.
1651 ;; Compute and save the abbreviated homedir name.
1652 ;; We defer computing this until the first time it's needed, to
1653 ;; give time for directory-abbrev-alist to be set properly.
1654 ;; We include a slash at the end, to avoid spurious matches
1655 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1662 ;; If FILENAME starts with the abbreviated homedir,
1663 ;; make it start with `~' instead.
1665 ;; If the home dir is just /, don't change it.
1668 ;; MS-DOS root directories can come with a drive letter;
1669 ;; Novell Netware allows drive letters beyond `Z:'.
1677 filename)))
1680 "Return the buffer visiting file FILENAME (a string).
1681 This is like `get-file-buffer', except that it checks for any buffer
1682 visiting the same file, possibly under a different name.
1683 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1684 and others are ignored.
1685 If there is no such live buffer, return nil."
1698 found)
1708 ;; Verify this buffer's file number
1709 ;; still belongs to its file.
1712 attributes)
1716 found))))
1717 \f
1719 "Non-nil means file-visiting commands should handle wildcards.
1720 For example, if you specify `*.c', that would visit all the files
1721 whose names match the pattern."
1727 "Non-nil means suppress warning messages for symlinked files.
1728 When nil, Emacs prints a warning when visiting a file that is already
1729 visited, but with a different name. Setting this option to t
1730 suppresses this warning."
1736 "Maximum size of file above which a confirmation is requested.
1737 When nil, never request confirmation."
1744 "If file SIZE larger than `large-file-warning-threshold', allow user to abort.
1745 OP-TYPE specifies the file operation being performed (for message to user)."
1754 "Read file FILENAME into a buffer and return the buffer.
1755 If a buffer exists visiting FILENAME, return that one, but
1756 verify that the file has not changed since visited or saved.
1757 The buffer is not selected, just returned to the caller.
1758 Optional second arg NOWARN non-nil means suppress any warning messages.
1759 Optional third arg RAWFILE non-nil means the file is read literally.
1760 Optional fourth arg WILDCARDS non-nil means do wildcard processing
1761 and visit all the matching files. When wildcards are actually
1762 used and expanded, return a list of buffers that are visiting
1763 the various files."
1770 'find-directory-functions
1773 filename)))
1776 find-file-wildcards
1790 ;; Find any buffer for a file which has same truename.
1792 ;; Let user know if there is a buffer with the same truename.
1796 find-file-suppress-same-file-warnings
1800 ;; Optionally also find that buffer.
1803 ;; Check to see if the file looks uncommonly large.
1807 ;; We are using an existing buffer.
1814 ;; Certain files should be reverted automatically
1815 ;; if they have changed on disk and not in the buffer.
1823 found))
1833 "File %s changed on disk. Discard your edits? "
1838 "File %s changed on disk. Discard your edits in %s? "
1846 ;; Check if a formerly read-only file has become
1847 ;; writable and vice versa, but if the buffer agrees
1848 ;; with the new state of the file, that is ok too.
1856 buffer-file-name
1865 ;; It is confusing to ask whether to visit
1866 ;; non-literally if they have the file in
1867 ;; hexl-mode or image-mode.
1873 "The file %s is already visited normally,
1874 and you have edited the buffer. Now you have asked to visit it literally,
1875 meaning no coding system handling, format conversion, or local variables.
1876 Emacs can only visit a file in one way at a time.
1878 Do you want to save the file, and visit it literally instead? "
1879 "The file %s is already visited literally,
1880 meaning no coding system handling, format conversion, or local variables.
1881 You have edited the buffer. Now you have asked to visit the file normally,
1882 but Emacs can only visit a file in one way at a time.
1889 rawfile truename number))
1893 "\
1894 Do you want to discard your changes, and visit the file literally now? "
1895 "\
1898 rawfile truename number)
1904 "The file %s is already visited normally.
1905 You have asked to visit it literally,
1906 meaning no coding system decoding, format conversion, or local variables.
1907 But Emacs can only visit a file in one way at a time.
1909 Do you want to revisit the file literally now? "
1910 "The file %s is already visited literally,
1911 meaning no coding system decoding, format conversion, or local variables.
1912 You have asked to visit it normally,
1913 but Emacs can only visit a file in one way at a time.
1918 rawfile truename number)
1921 ;; Return the buffer we are using.
1922 buf)
1923 ;; Create a new buffer.
1925 ;; find-file-noselect-1 may use a different buffer.
1927 rawfile truename number))))))
1933 ;; Needed in case we are re-visiting the file with a different
1934 ;; text representation.
1951 filename)))
1952 ;; Unconditionally set error
1962 filename)))
1963 ;; Run find-file-not-found-functions until one returns non-nil.
1965 ;; If they fail too, set error.
1967 ;; Record the file's truename, and maybe use that as visited name.
1975 ;; Set buffer's default directory to that of the file.
1977 ;; Turn off backup files for certain file names. Since
1978 ;; this is a permanent local, the major mode won't eliminate it.
1992 \f
1994 "Like `insert-file-contents', but only reads in the file literally.
1995 A buffer may be modified in several ways after reading into the buffer,
1996 to Emacs features such as format decoding, character code
1997 conversion, `find-file-hook', automatic uncompression, etc.
1999 This function ensures that none of these modifications will take place."
2005 ;; FIXME: Yuck!! We should turn insert-file-contents-literally
2006 ;; into a file operation instead!
2008 inhibit-file-name-handlers))
2015 filename)))
2016 ;; Check whether the file is uncommonly large
2027 "Insert contents of file FILENAME into buffer after point with no conversion.
2029 This function is meant for the user to run interactively.
2030 Don't call it from programs! Use `insert-file-contents-literally' instead.
2031 \(Its calling sequence is different; see its documentation)."
2036 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
2037 This has the `permanent-local' property, which takes effect if you
2042 "Visit file FILENAME with no conversion of any kind.
2043 Format conversion and character code conversion are both disabled,
2044 and multibyte characters are disabled in the resulting buffer.
2045 The major mode used is Fundamental mode regardless of the file name,
2046 and local variable specifications in the file are ignored.
2047 Automatic uncompression and adding a newline at the end of the
2048 file due to `require-final-newline' is also disabled.
2050 You cannot absolutely rely on this function to result in
2051 visiting the file literally. If Emacs already has a buffer
2052 which is visiting the file, you get the existing buffer,
2053 regardless of whether it was created literally or not.
2055 In a Lisp program, if you want to be sure of accessing a file's
2056 contents literally, you should create a temporary buffer and then read
2057 the file contents into it using `insert-file-contents-literally'."
2060 "Find file literally: " nil default-directory
2063 \f
2065 _after-find-file-from-revert-buffer
2066 nomodes)
2067 "Called after finding a file and by the default revert function.
2068 Sets buffer mode, parses local variables.
2069 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
2070 error in reading the file. WARN non-nil means warn if there
2071 exists an auto-save file more recent than the visited file.
2072 NOAUTO means don't mess with auto-save mode.
2073 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER is ignored
2074 \(see `revert-buffer-in-progress-p' for similar functionality).
2075 Fifth arg NOMODES non-nil means don't alter the file's modes.
2076 Finishes by calling the functions in `find-file-hook'
2077 unless NOMODES is non-nil."
2080 nil
2090 "Symbolic link that points to nonexistent file"
2094 ;; No need to warn if buffer is auto-saved
2095 ;; under the name of the visited file.
2097 auto-save-visited-file-name))
2100 buffer-file-name))
2120 ;; Make people do a little extra work (C-x C-q)
2121 ;; before altering a backup file.
2124 ;; When a file is marked read-only,
2125 ;; make the buffer read-only even if root is looking at it.
2133 ;; If requested, add a newline at the end of the file.
2144 view-read-only
2150 "Eval BODY and turn any error into a FORMAT message.
2151 FORMAT can have a %s escape which will be replaced with the actual error.
2152 If `debug-on-error' is set, errors are not caught, so that you can
2153 debug them.
2154 Avoid using a large BODY since it is duplicated."
2163 "Choose the major mode for this buffer automatically.
2164 Also sets up any specified local variables of the file.
2165 Uses the visited file name, the -*- line, and the local variables spec.
2167 This function is called automatically from `find-file'. In that case,
2168 we may set up the file-specified mode and local variables,
2169 depending on the value of `enable-local-variables'.
2170 In addition, if `local-enable-local-variables' is nil, we do
2171 not set local variables (though we do notice a mode specified with -*-.)
2173 `enable-local-variables' is ignored if you run `normal-mode' interactively,
2174 or from Lisp without specifying the optional argument FIND-FILE;
2175 in that case, this function acts as if `enable-local-variables' were t."
2179 ;; FIXME this is less efficient than it could be, since both
2180 ;; s-a-m and h-l-v may parse the same regions, looking for "mode:".
2185 ;; Turn font lock off and on, to make sure it takes account of
2186 ;; whatever file local variables are relevant to it.
2188 ;; Font-lock-mode (now in font-core.el) can be ON when
2189 ;; font-lock.el still hasn't been loaded.
2196 "Non-nil means to try second pass through `auto-mode-alist'.
2197 This means that if the first case-sensitive search through the alist fails
2198 to find a matching major mode, a second case-insensitive search is made.
2199 On systems with case-insensitive file names, this variable is ignored,
2200 since only a single case-insensitive search through the alist is made."
2206 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
2207 ;; c++-mode, java-mode and more) are added through autoload
2208 ;; directives in that file. That way is discouraged since it
2209 ;; spreads out the definition of the initial value.
2255 ;; Less common extensions come here
2256 ;; so more common ones above are found faster.
2264 ;; Besides .gdbinit, gdb documents other names to be usable for init
2265 ;; files, cross-debuggers can use something like
2266 ;; .PROCESSORNAME-gdbinit so that the host and target gdbinit files
2267 ;; don't interfere with each other.
2299 ;; The Fortran standard does not say anything about file extensions.
2300 ;; .f90 was widely used for F90, now we seem to be trapped into
2301 ;; using a different extension for each language revision.
2302 ;; Anyway, the following extensions are supported by gfortran.
2310 ;; The list of archive file extensions should be in sync with
2311 ;; `auto-coding-alist' with `no-conversion' coding system.
2317 ;; Mailer puts message to be edited in
2318 ;; /tmp/Re.... or Message
2321 ;; some news reader is reported to use this
2334 ;; .emacs or .gnus or .viper following a directory delimiter in
2335 ;; Unix, MSDOG or VMS syntax.
2338 ;; _emacs following a directory delimiter
2339 ;; in MsDos syntax
2343 ;; Linux-2.6.9 uses some different suffix for linker scripts:
2344 ;; "ld", "lds", "lds.S", "lds.in", "ld.script", and "ld.script.balo".
2345 ;; eCos uses "ld" and "ldi". Netbsd uses "ldscript.*".
2348 ;; .xs is also used for ld scripts, but seems to be more commonly
2349 ;; associated with Perl .xs files (C with Perl bindings). (Bug#7071)
2351 ;; Explained in binutils ld/genscripts.sh. Eg:
2352 ;; A .x script file is the default script.
2353 ;; A .xr script is for linking without relocation (-r flag). Etc.
2357 ;; Common Lisp ASDF package system.
2364 ("\\.\\(?:PDF\\|DVI\\|OD[FGPST]\\|DOCX?\\|XLSX?\\|PPTX?\\|pdf\\|djvu\\|dvi\\|od[fgpst]\\|docx?\\|xlsx?\\|pptx?\\)\\'" . doc-view-mode-maybe)
2376 ;; Windows candidates may be opened case sensitively on Unix
2382 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
2383 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
2384 ;; ChangeLog.old etc. Other change-log-mode entries are above;
2385 ;; this has lower priority to avoid matching changelog.sgml etc.
2387 ;; either user's dot-files or under /etc or some such
2389 ;; alas not all ~/.*rc files are like this
2390 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
2395 ;; this contains everything twice, with space and with colon :-(
2397 ;; Get rid of any trailing .n.m and try again.
2398 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
2399 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
2400 ;; Using mode nil rather than `ignore' would let the search continue
2401 ;; through this list (with the shortened name) rather than start over.
2404 ;; This should come after "in" stripping (e.g. config.h.in).
2405 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
2407 ;; The following should come after the ChangeLog pattern
2408 ;; for the sake of ChangeLog.1, etc.
2409 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
2411 "Alist of filename patterns vs corresponding major mode functions.
2412 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
2413 \(NON-NIL stands for anything that is not nil; the value does not matter.)
2414 Visiting a file whose name matches REGEXP specifies FUNCTION as the
2415 mode function to use. FUNCTION will be called, unless it is nil.
2417 If the element has the form (REGEXP FUNCTION NON-NIL), then after
2418 calling FUNCTION (if it's not nil), we delete the suffix that matched
2419 REGEXP and search the list again for another match.
2421 The extensions whose FUNCTION is `archive-mode' should also
2422 appear in `auto-coding-alist' with `no-conversion' coding system.
2424 See also `interpreter-mode-alist', which detects executable script modes
2425 based on the interpreters they specify to run,
2430 "Select Conf mode or XML mode according to start of file."
2440 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
2441 ;; and pike-mode) are added through autoload directives in that
2442 ;; file. That way is discouraged since it spreads out the
2443 ;; definition of the initial value.
2483 "Alist mapping interpreter names to major modes.
2484 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
2485 Each element looks like (INTERPRETER . MODE).
2486 If INTERPRETER matches the name of the interpreter specified in the first line
2487 of a script, mode MODE is enabled.
2494 ;; TODO really this should be a list of modes (eg tar-mode), not regexps,
2495 ;; because we are duplicating info from auto-mode-alist.
2496 ;; TODO many elements of this list are also in auto-coding-alist.
2505 "List of regexps matching file names in which to ignore local variables.
2507 Files matching this list are typically binary file formats.
2508 They may happen to contain sequences that look like local variable
2509 specifications, but are not really, or they may be containers for
2510 member files with their own local variable sections, which are
2511 not appropriate for the containing file.
2518 "List of regexps matching suffixes to remove from file names.
2519 The function `inhibit-local-variables-p' uses this: when checking
2520 a file name, it first discards from the end of the name anything that
2523 ;; Can't think of any situation in which you'd want this to be nil...
2528 "Return non-nil if file local variables should be ignored.
2529 This checks the file (or buffer) name against `inhibit-local-variables-regexps'
2530 and `inhibit-local-variables-suffixes'. If
2531 `inhibit-local-variables-ignore-case' is non-nil, this ignores case."
2540 sufs)
2545 temp))
2550 "Regexp matching interpreters, for file mode determination.
2551 This regular expression is matched against the first line of a file
2552 to determine the file's mode in `set-auto-mode'. If it matches, the file
2553 is assumed to be interpreted by the interpreter matched by the second group
2554 of the regular expression. The mode is then determined as the mode
2558 "Alist of buffer beginnings vs. corresponding major mode functions.
2559 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2560 After visiting a file, if REGEXP matches the text at the beginning of the
2561 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2562 call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
2563 major mode.
2565 If FUNCTION is nil, then it is not called. (That is a way of saying
2573 ;; The < comes before the groups (but the first) to reduce backtracking.
2574 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
2575 ;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
2579 comment-re "*"
2582 . html-mode)
2584 ;; These two must come after html, because they are more general:
2589 . sgml-mode)
2592 "Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
2593 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2594 After visiting a file, if REGEXP matches the text at the beginning of the
2595 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2596 call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
2597 have not specified a mode for this file.
2603 "Upper limit on `magic-mode-alist' regexp matches.
2607 "Select major mode appropriate for current buffer.
2609 To find the right major mode, this function checks for a -*- mode tag
2610 checks for a `mode:' entry in the Local Variables section of the file,
2611 checks if it uses an interpreter listed in `interpreter-mode-alist',
2612 matches the buffer beginning against `magic-mode-alist',
2613 compares the filename against the entries in `auto-mode-alist',
2614 then matches the buffer beginning against `magic-fallback-mode-alist'.
2616 If `enable-local-variables' is nil, or if the file name matches
2617 `inhibit-local-variables-regexps', this function does not check
2618 for any mode: tag anywhere in the file. If `local-enable-local-variables'
2619 is nil, then the only mode: tag that can be relevant is a -*- one.
2621 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2622 set the major mode only if that would change it. In other words
2623 we don't actually set it to the same mode the buffer already has."
2624 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2626 end done mode modes)
2627 ;; Once we drop the deprecated feature where mode: is also allowed to
2628 ;; specify minor-modes (ie, there can be more than one "mode:"), we can
2629 ;; remove this section and just let (hack-local-variables t) handle it.
2630 ;; Find a -*- mode tag.
2634 ;; Note by design local-enable-local-variables does not matter here.
2636 try-locals
2639 ;; Find all specifications for the `mode:' variable
2640 ;; and execute them left to right.
2652 modes)))
2653 ;; Simple -*-MODE-*- case.
2656 modes))))
2657 ;; If we found modes to use, invoke them now, outside the save-excursion.
2665 ;; continuing would call minor modes again, toggling them off
2667 ;; hack-local-variables checks local-enable-local-variables etc, but
2668 ;; we might as well be explicit here for the sake of clarity.
2670 enable-local-variables
2671 local-enable-local-variables
2672 try-locals
2679 ;; If we didn't, look for an interpreter specified in the first line.
2680 ;; As a special case, allow for things like "#!/bin/env perl", which
2681 ;; finds the interpreter anywhere in $PATH.
2688 ;; Map interpreter name to a mode, signaling we're done at the
2689 ;; same time.
2691 interpreter-mode-alist))
2692 ;; If we found an interpreter mode to use, invoke it now.
2695 ;; Next try matching the buffer beginning against magic-mode-alist.
2709 ;; Next compare the filename against the entries in auto-mode-alist.
2714 ;; Remove backup-suffixes from file name.
2716 ;; Remove remote file name identification.
2721 ;; Find first matching alist entry.
2724 ;; System is case-insensitive.
2728 ;; System is case-sensitive.
2730 ;; First match case-sensitively.
2734 ;; Fallback to case-insensitive match.
2748 ;; Next try matching the buffer beginning against magic-fallback-mode-alist.
2765 ;; When `keep-mode-if-same' is set, we are working on behalf of
2766 ;; set-visited-file-name. In that case, if the major mode specified is the
2767 ;; same one we already have, don't actually reset it. We don't want to lose
2768 ;; minor modes such as Font Lock.
2770 "Apply MODE and return it.
2771 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2772 any aliases and compared to current major mode. If they are the
2773 same, do nothing and return nil."
2779 mode)))
2782 "Regexp of lines to skip when looking for file-local settings.
2783 If the first line matches this regular expression, then the -*-...-*- file-
2787 "Find the -*- spec in the buffer.
2788 Call with point at the place to start searching from.
2789 If one is found, set point to the beginning and return the position
2790 of the end. Otherwise, return nil; may change point.
2791 The variable `inhibit-local-variables-regexps' can cause a -*- spec to
2792 be ignored; but `enable-local-variables' and `local-enable-local-variables'
2793 have no effect."
2796 ;; Don't look for -*- if this file name matches any
2797 ;; of the regexps in inhibit-local-variables-regexps.
2800 ;; If the file begins with "#!" (exec
2801 ;; interpreter magic), look for mode frobs
2802 ;; in the first two lines. You cannot
2803 ;; necessarily put them in the first line
2804 ;; of such a file without screwing up the
2805 ;; interpreter invocation. The same holds
2806 ;; for '\" in man pages (preprocessor
2807 ;; magic for the `man' program).
2818 end))))
2819 \f
2820 ;;; Handling file local variables
2824 file-local-variables-alist dir-local-variables-alist)
2829 "Normal hook run after processing a file's local variables specs.
2830 Major modes can use this to examine user-specified local variables
2834 "List variable-value pairs that are considered safe.
2835 Each element is a cons cell (VAR . VAL), where VAR is a variable
2836 symbol and VAL is a value that is considered safe."
2837 :risky t
2842 ;; This should be here at least as long as Emacs supports write-file-hooks.
2847 "Expressions that are considered safe in an `eval:' local variable.
2848 Add expressions to this list if you want Emacs to evaluate them, when
2849 they appear in an `eval' local variable specification, without first
2850 asking you for confirmation."
2851 :risky t
2856 ;; Risky local variables:
2859 buffer-auto-save-file-name
2860 buffer-file-name
2861 buffer-file-truename
2862 buffer-undo-list
2863 debugger
2864 default-text-properties
2865 eval
2866 exec-directory
2867 exec-path
2868 file-name-handler-alist
2869 frame-title-format
2870 global-mode-string
2871 header-line-format
2872 icon-title-format
2873 inhibit-quit
2874 load-path
2875 max-lisp-eval-depth
2876 max-specpdl-size
2877 minor-mode-map-alist
2878 minor-mode-overriding-map-alist
2879 mode-line-format
2880 mode-name
2881 overriding-local-map
2882 overriding-terminal-local-map
2883 process-environment
2884 standard-input
2885 standard-output
2886 unread-command-events))
2888 ;; Safe local variables:
2889 ;;
2890 ;; For variables defined by major modes, the safety declarations can go into
2891 ;; the major mode's file, since that will be loaded before file variables are
2892 ;; processed.
2893 ;;
2894 ;; For variables defined by minor modes, put the safety declarations in the
2895 ;; file defining the minor mode after the defcustom/defvar using an autoload
2896 ;; cookie, e.g.:
2897 ;;
2898 ;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
2899 ;;
2900 ;; Otherwise, when Emacs visits a file specifying that local variable, the
2901 ;; minor mode file may not be loaded yet.
2902 ;;
2903 ;; For variables defined in the C source code the declaration should go here:
2925 "Alist of file-local variable settings in the current buffer.
2926 Each element in this list has the form (VAR . VALUE), where VAR
2927 is a file-local variable (a symbol) and VALUE is the value
2928 specified. The actual value in the buffer may differ from VALUE,
2934 "Alist of directory-local variable settings in the current buffer.
2935 Each element in this list has the form (VAR . VALUE), where VAR
2936 is a directory-local variable (a symbol) and VALUE is the value
2937 specified in .dir-locals.el. The actual value in the buffer
2938 may differ from VALUE, if it is changed by the major or minor modes,
2943 "Normal hook run before setting file-local variables.
2944 It is called after checking for unsafe/risky variables and
2945 setting `file-local-variables-alist', and before applying the
2946 variables stored in `file-local-variables-alist'. A hook
2947 function is allowed to change the contents of this alist.
2949 This hook is called only if there is at least one file-local
2953 "Get confirmation before setting up local variable values.
2954 ALL-VARS is the list of all variables to be set up.
2955 UNSAFE-VARS is the list of those that aren't marked as safe or risky.
2956 RISKY-VARS is the list of those that are marked as risky.
2957 If these settings come from directory-local variables, then
2958 DIR-NAME is the name of the associated directory. Otherwise it is nil."
2965 unsafe-vars))
2967 ;; Set up the contents of the *Local Variables* buffer.
2975 ", and variables that are risky (**)."
2983 y -- to apply the local variables list.
2987 ! -- to apply the local variables list, and permanently mark these
2999 ;; Make strings with embedded whitespace easier to read.
3007 ;; Display the buffer and read a choice.
3015 ""
3018 char)
3037 "Return local variables specified in the -*- line.
3038 Returns an alist of elements (VAR . VAL), where VAR is a variable
3039 and VAL is the specified value. Ignores any specification for
3040 `mode:' and `coding:' (which should have already been handled
3041 by `set-auto-mode' and `set-auto-coding', respectively).
3042 Return nil if the -*- line is malformed.
3044 If MODE-ONLY is non-nil, just returns the symbol specifying the
3045 mode, if there is one, otherwise nil."
3050 result)
3052 nil)
3054 ;; Simple form: "-*- MODENAME -*-".
3058 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
3059 ;; (last ";" is optional).
3060 ;; If MODE-ONLY, just check for `mode'.
3061 ;; Otherwise, parse the -*- line into the RESULT alist.
3069 ;; There used to be a downcase here,
3070 ;; but the manual didn't say so,
3071 ;; and people want to set var names that aren't all lc.
3077 ;; It is traditional to ignore
3078 ;; case when checking for `mode' in set-auto-mode,
3079 ;; so we must do that here as well.
3080 ;; That is inconsistent, but we're stuck with it.
3081 ;; The same can be said for `coding' in set-auto-coding.
3091 ;; Downcase "Mode:".
3097 result))))))
3100 "Filter local variable settings, querying the user if necessary.
3101 VARIABLES is the alist of variable-value settings. This alist is
3102 filtered based on the values of `ignored-local-variables',
3103 `enable-local-eval', `enable-local-variables', and (if necessary)
3104 user interaction. The results are added to
3105 `file-local-variables-alist', without applying them.
3106 If these settings come from directory-local variables, then
3107 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3108 ;; Find those variables that we may want to save to
3109 ;; `safe-local-variable-values'.
3115 ;; Ignore any variable in `ignored-local-variables'.
3116 nil)
3117 ;; Obey `enable-local-eval'.
3121 ;; In case previously marked safe (bug#5636).
3123 ;; If not safe and e-l-v = :safe, ignore totally.
3127 safe
3129 ;; Ignore duplicates (except `mode') in the present list.
3131 ;; Accept known-safe variables.
3135 ;; The variable is either risky or unsafe:
3142 ;; Query, unless all vars are safe or user wants no querying.
3148 risky-vars dir-name))
3159 "Parse and put into effect this buffer's local variables spec.
3160 Uses `hack-local-variables-apply' to apply the variables.
3163 is specified, and return the corresponding mode symbol, or nil.
3164 In this case, we try to ignore minor-modes, and only return a
3165 major-mode.
3167 If `enable-local-variables' or `local-enable-local-variables' is nil,
3168 this function does nothing. If `inhibit-local-variables-regexps'
3169 applies to the file in question, the file is not scanned for
3170 local variables, but directory-local variables may still be applied."
3171 ;; We don't let inhibit-local-variables-p influence the value of
3172 ;; enable-local-variables, because then it would affect dir-local
3173 ;; variables. We don't want to search eg tar files for file local
3174 ;; variable sections, but there is no reason dir-locals cannot apply
3175 ;; to them. The real meaning of inhibit-local-variables-p is "do
3176 ;; not scan this file for local variables".
3179 result)
3183 ;; Note this is a no-op if enable-local-variables is nil.
3185 ;; This entire function is basically a no-op if enable-local-variables
3186 ;; is nil. All it does is set file-local-variables-alist to nil.
3188 ;; This part used to ignore enable-local-variables when mode-only
3189 ;; was non-nil. That was inappropriate, eg consider the
3190 ;; (artificial) example of:
3191 ;; (setq local-enable-local-variables nil)
3192 ;; Open a file foo.txt that contains "mode: sh".
3193 ;; It correctly opens in text-mode.
3194 ;; M-x set-visited-file name foo.c, and it incorrectly stays in text-mode.
3196 ;; If MODE-ONLY is non-nil, and the prop line specifies a
3197 ;; mode, then we're done, and have no need to scan further.
3199 mode-only))
3200 ;; Look for "Local variables:" line in last page.
3208 ;; suffix is what comes after "local variables:" in its line.
3209 ;; prefix is what comes before "local variables:" in its line.
3222 endpos
3228 nil t))
3229 ;; This used to be an error, but really all it means is
3230 ;; that this may simply not be a local-variables section,
3231 ;; so just ignore it.
3241 ;; Discard the prefix.
3246 ;; Discard the suffix.
3255 ;; Find the variable name;
3263 val val2)
3266 ;; Read the variable value.
3273 ;; Specifying minor-modes via mode: is
3274 ;; deprecated, but try to reject them anyway.
3282 'eval
3287 ;; Now we've read all the local variables.
3288 ;; If MODE-ONLY is non-nil, return whether the mode was specified.
3290 ;; Otherwise, set the variables.
3295 "Apply the elements of `file-local-variables-alist'.
3296 If there are any elements, runs `before-hack-local-variables-hook',
3297 then calls `hack-one-local-variable' to apply the alist elements one by one.
3298 Finishes by running `hack-local-variables-hook', regardless of whether
3299 the alist is empty or not.
3301 Note that this function ignores a `mode' entry if it specifies the same
3302 major mode as the buffer already has."
3304 ;; Any 'evals must run in the Right sequence.
3313 "Non-nil if SYM is safe as a file-local variable with value VAL.
3314 It is safe if any of these conditions are met:
3316 * There is a matching entry (SYM . VAL) in the
3317 `safe-local-variable-values' user option.
3319 * The `safe-local-variable' property of SYM is a function that
3320 evaluates to a non-nil value with VAL as an argument."
3324 ;; If the function signals an error, that means it
3325 ;; can't assure us that the value is safe.
3329 "Non-nil if SYM could be dangerous as a file-local variable.
3330 It is dangerous if either of these conditions are met:
3332 * Its `risky-local-variable' property is non-nil.
3338 ;; If this is an alias, check the base name.
3358 "Return t if it is safe to eval EXP when it is found in a file."
3360 ;; Detect certain `put' expressions.
3367 lisp-indent-function
3368 scheme-indent-function))
3369 ;; Only allow safe values (not functions).
3374 ;; Only allow indirect form specs.
3375 ;; During bootstrapping, edebug-basic-spec might not be
3376 ;; defined yet.
3380 ;; Allow expressions that the user requested.
3382 ;; Certain functions can be allowed with safe arguments
3383 ;; or can specify verification functions to try.
3385 ;; Allow (minor)-modes calls with no arguments.
3386 ;; This obsoletes the use of "mode:" for such things. (Bug#8613)
3395 ok))
3403 ok))))))))
3416 "Set local variable VAR with value VAL.
3417 If VAR is `mode', call `VAL-mode' as a function unless it's
3418 already the major mode."
3420 (`mode
3426 (`eval
3432 ;; Make sure the string has no text properties.
3433 ;; Some text properties can get evaluated in various ways,
3434 ;; so it is risky to put them on with a local variable list.
3438 \f
3439 ;;; Handling directory-local variables, aka project settings.
3445 "List of cached directory roots for directory-local variable classes.
3446 Each element in this list has the form (DIR CLASS MTIME).
3447 DIR is the name of the directory.
3448 CLASS is the name of a variable class (a symbol).
3449 MTIME is the recorded modification time of the directory-local
3450 variables file associated with this entry. This time is a list
3451 of integers (the same format as `file-attributes'), and is
3452 used to test whether the cache entry is still valid.
3453 Alternatively, MTIME can be nil, which means the entry is always
3457 "Return the variable list for CLASS."
3461 "Collect directory-local variables from MODE-VARIABLES.
3462 VARIABLES is the initial list of variables.
3463 Returns the new list."
3468 ;; If variables are specified more than once, only use the last. (Why?)
3469 ;; The pseudo-variables mode and eval are different (bug#3430).
3472 ;; Need a new cons in case we setcdr later.
3476 "Collect entries from CLASS-VARIABLES into VARIABLES.
3477 ROOT is the root directory of the project.
3478 Return the new variables list."
3481 ;; FIXME: Why not use file-relative-name?
3488 ;; Don't include this in the previous condition, because we
3489 ;; want to filter all strings before the next condition.
3503 ;; TODO someone might want to extend this to allow
3504 ;; integer values for subdir, where N means
3505 ;; variables apply to this directory and N levels
3506 ;; below it (0 == nil).
3509 alist variables))))))))
3511 ;; The file's content might be invalid (e.g. have a merge conflict), but
3512 ;; that shouldn't prevent the user from opening the file.
3514 nil))))
3517 "Declare that the DIRECTORY root is an instance of CLASS.
3518 DIRECTORY is the name of a directory, a string.
3519 CLASS is the name of a project class, a symbol.
3520 MTIME is either the modification time of the directory-local
3521 variables file that defined this class, or nil.
3523 When a file beneath DIRECTORY is visited, the mode-specific
3524 variables from CLASS are applied to the buffer. The variables
3525 for a class are defined using `dir-locals-set-class-variables'."
3532 "Map the type CLASS to a list of variable settings.
3533 CLASS is the project class, a symbol. VARIABLES is a list
3534 that declares directory-local variables for the class.
3535 An element in VARIABLES is either of the form:
3536 (MAJOR-MODE . ALIST)
3537 or
3538 (DIRECTORY . LIST)
3540 In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
3541 whose elements are of the form (VARIABLE . VALUE).
3543 In the second form, DIRECTORY is a directory name (a string), and
3544 LIST is a list of the form accepted by the function.
3546 When a file is visited, the file's class is found. A directory
3547 may be assigned a class using `dir-locals-set-directory-class'.
3548 Then variables are set in the file's buffer according to the
3549 VARIABLES list of the class. The list is processed in order.
3551 * If the element is of the form (MAJOR-MODE . ALIST), and the
3552 buffer's major mode is derived from MAJOR-MODE (as determined
3553 by `derived-mode-p'), then all the variables in ALIST are
3554 applied. A MAJOR-MODE of nil may be used to match any buffer.
3555 `make-local-variable' is called for each variable before it is
3556 set.
3558 * If the element is of the form (DIRECTORY . LIST), and DIRECTORY
3559 is an initial substring of the file's directory, then LIST is
3560 applied by recursively following these rules."
3567 "File that contains directory-local variables.
3568 It has to be constant to enforce uniform values
3572 "Find the directory-local variables for FILE.
3573 This searches upward in the directory tree from FILE.
3574 It stops at the first directory that has been registered in
3575 `dir-locals-directory-cache' or contains a `dir-locals-file'.
3576 If it finds an entry in the cache, it checks that it is valid.
3577 A cache entry with no modification time element (normally, one that
3578 has been assigned directly using `dir-locals-set-directory-class', not
3579 set from a file) is always valid.
3580 A cache entry based on a `dir-locals-file' is valid if the modification
3581 time stored in the cache matches the current file modification time.
3582 If not, the cache entry is cleared so that the file will be re-read.
3584 This function returns either nil (no directory local variables found),
3585 or the matching entry from `dir-locals-directory-cache' (a list),
3586 or the full path to the `dir-locals-file' (a string) in the case
3587 of no valid cache entry."
3592 dir-locals-file))
3595 ;; `locate-dominating-file' may have abbreviated the name.
3598 ;; Let dir-locals-read-from-file inform us via demoted-errors
3599 ;; about unreadable files, etc.
3600 ;; Maybe we'd want to keep searching though - that is
3601 ;; a locate-dominating-file issue.
3602 ;;; (or (not (file-readable-p locals-file))
3603 ;;; (not (file-regular-p locals-file)))
3604 ;;; (setq locals-file nil))
3605 ;; Find the best cached value in `dir-locals-directory-cache'.
3617 ;; Found a potential cache entry. Check validity.
3618 ;; A cache entry with no MTIME is assumed to always be valid
3619 ;; (ie, set directly, not from a dir-locals file).
3620 ;; Note, we don't bother to check that there is a matching class
3621 ;; element in dir-locals-class-alist, since that's done by
3622 ;; dir-locals-set-directory-class.
3629 ;; This cache entry is OK.
3630 dir-elt
3631 ;; This cache entry is invalid; clear it.
3634 ;; Return the first existing dir-locals file. Might be the same
3635 ;; as dir-elt's, might not (eg latter might have been deleted).
3636 locals-file)
3637 ;; No cache entry.
3638 locals-file)))
3641 "Load a variables FILE and register a new class and instance.
3642 FILE is the name of the file holding the variables to apply.
3643 The new class name is the same as the directory in which FILE
3644 is found. Returns the new class name."
3646 ;; This is with-demoted-errors, but we want to mention dir-locals
3647 ;; in any error message.
3660 class-name)))
3664 "Non-nil means dir-local variables will be applied to remote files."
3670 "Read per-directory local variables for the current buffer.
3671 Store the directory-local variables in `dir-local-variables-alist'
3672 and `file-local-variables-alist', without applying them.
3674 This does nothing if either `enable-local-variables' or
3675 `enable-dir-local-variables' are nil."
3677 enable-dir-local-variables
3680 default-directory)))))
3681 ;; Find the variables file.
3709 "Apply directory-local variables to a non-file buffer.
3710 For non-file buffers, such as Dired buffers, directory-local
3711 variables are looked for in `default-directory' and its parent
3712 directories."
3716 \f
3719 However, the mode will not be changed if
3720 \(1) a local variables list or the `-*-' line specifies a major mode, or
3722 \ not suitable for ordinary files, or
3723 \(3) the new file name does not particularly specify any mode."
3728 "Change name of file visited in current buffer to FILENAME.
3729 This also renames the buffer to correspond to the new file.
3730 The next time the buffer is saved it will go in the newly specified file.
3731 FILENAME nil or an empty string means mark buffer as not visiting any file.
3732 Remember to delete the initial contents of the minibuffer
3733 if you wish to pass an empty string as the argument.
3735 The optional second argument NO-QUERY, if non-nil, inhibits asking for
3736 confirmation in the case where another buffer is already visiting FILENAME.
3738 The optional third argument ALONG-WITH-FILE, if non-nil, means that
3739 the old visited file has been renamed to the new name FILENAME."
3747 nil
3762 filename)))
3769 buffer-file-name filename)
3773 ;; If new-name == old-name, renaming would add a spurious <2>
3774 ;; and it's considered as a feature in rename-buffer.
3780 ;; Abbreviate the file names of the buffer.
3789 nil))
3790 ;; write-file-functions is normally used for things like ftp-find-file
3791 ;; that visit things that are not local files as if they were files.
3792 ;; Changing to visit an ordinary local file instead should flush the hook.
3797 ;; If buffer was read-only because of version control,
3798 ;; that reason is gone now, so make it writable.
3802 ;; Turn off backup files for certain file names.
3803 ;; Since this is a permanent local, the major mode won't eliminate it.
3805 backup-enable-predicate
3811 ;; If auto-save was not already on, turn it on if appropriate.
3815 ;; If auto save is on, start using a new name.
3816 ;; We deliberately don't rename or delete the old auto save
3817 ;; for the old visited file name. This is because perhaps
3818 ;; the user wants to save the new state and then compare with the
3819 ;; previous state from the auto save file.
3822 ;; Rename the old auto save file if any.
3829 ;; Update the major mode, if the file name determines it.
3831 ;; Don't change the mode if it is special.
3834 ;; Don't change the mode if the local variable list specifies it.
3835 ;; The file name can influence whether the local variables apply.
3837 ;; h-l-v also checks it, but might as well be explicit.
3840 ;; TODO consider making normal-mode handle this case.
3848 "Write current buffer into file FILENAME.
3849 This makes the buffer visit that file, and marks it as not modified.
3851 If you specify just a directory name as FILENAME, that means to use
3852 the default file name but in that directory. You can also yank
3853 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
3855 If the buffer is not already visiting a file, the default file name
3856 for the output file is the buffer name.
3858 If optional second arg CONFIRM is non-nil, this function
3859 asks for confirmation before overwriting an existing file.
3860 Interactively, confirmation is required unless you supply a prefix argument."
3861 ;; (interactive "FWrite file: ")
3865 nil nil nil nil)
3869 default-directory)
3870 nil nil))
3874 ;; If arg is just a directory,
3875 ;; use the default file name, but in that directory.
3886 ;; Make buffer writable if file is writable.
3891 ;; It's likely that the VC status at the new location is different from
3892 ;; the one at the old location.
3894 \f
3896 "Return an alist of extended attributes of file FILENAME.
3898 Extended attributes are platform-specific metadata about the file,
3899 such as SELinux context, list of ACL entries, etc."
3904 "Set extended attributes of file FILENAME to ATTRIBUTES.
3906 ATTRIBUTES must be an alist of file attributes as returned by
3907 `file-extended-attributes'."
3915 \f
3917 "Make a backup of the disk file visited by the current buffer, if appropriate.
3918 This is normally done before saving the buffer the first time.
3920 A backup may be done by renaming or by copying; see documentation of
3921 variable `make-backup-files'. If it's done by renaming, then the file is
3922 no longer accessible under its old name.
3924 The value is non-nil after a backup was made by renaming.
3925 It has the form (MODES EXTENDED-ATTRIBUTES BACKUPNAME).
3926 MODES is the result of `file-modes' on the original
3927 file; this means that the caller, after saving the buffer, should change
3928 the modes of the new file to agree with the old modes.
3929 EXTENDED-ATTRIBUTES is the result of `file-extended-attributes'
3930 on the original file; this means that the caller, after saving
3931 the buffer, should change the extended attributes of the new file
3932 to agree with the old attributes.
3933 BACKUPNAME is the backup file name, which is the old file renamed."
3940 backup-info backupname targets setmodes)
3941 ;; If specified name is a symbolic link, chase it to the target.
3942 ;; Thus we make the backups in the directory where the real file is.
3947 ;; (if (file-directory-p buffer-file-name)
3948 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
3952 ;; If have old versions to maybe delete,
3953 ;; ask the user to confirm now, before doing anything.
3954 ;; But don't actually delete til later.
3959 real-file-name)))))
3963 ;; Actually write the back up file.
3966 ; (file-symlink-p buffer-file-name)
3967 backup-by-copying
3968 ;; Don't rename a suid or sgid file.
3981 real-file-name t))))))
3983 backupname modes
3984 extended-attributes)
3985 ;; rename-file should delete old backup.
3988 backupname)))
3990 ;; If trouble writing the backup, write it in
3991 ;; .emacs.d/%backup%.
3994 backupname)
3997 modes extended-attributes)))
3999 ;; Now delete the old versions, if desired.
4006 setmodes)
4013 ;; Create temp files with strict access rights. It's easy to
4014 ;; loosen them later, whereas it's impossible to close the
4015 ;; time-window of loose permissions otherwise.
4018 ;; Try to overwrite old backup first.
4026 nil)
4028 ;; The file was somehow created by someone else between
4029 ;; `delete-file' and `copy-file', so let's try again.
4030 ;; rms says "I think there is also a possible race
4031 ;; condition for making backup files" (emacs-devel 20070821).
4032 nil)))
4033 ;; Reset the umask.
4035 ;; If set-file-extended-attributes fails, fall back on set-file-modes.
4044 ;; The last ~[[:digit]]+ matches relative versions in git,
4045 ;; e.g. `foo.js.~HEAD~1~'.
4046 "Regular expression matching the backup/version part of a file name.
4050 "Return file NAME sans backup versions or strings.
4051 This is a separate procedure so your site-init or startup file can
4052 redefine it.
4053 If the optional argument KEEP-BACKUP-VERSION is non-nil,
4054 we do not remove backup version numbers, only true file version numbers.
4055 See also `file-name-version-regexp'."
4062 name))))))
4065 "Return t if deleting FILE and rewriting it would preserve the owner.
4066 Return nil if FILE does not exist, or if deleting and recreating it
4067 might not preserve the owner. If GROUP is non-nil, check whether
4068 the group would be preserved too."
4073 ;; Return t if the file doesn't exist, since it's true that no
4074 ;; information would be lost by an (attempted) delete and create.
4077 ;; Files created on Windows by Administrator (RID=500)
4078 ;; have the Administrators group (RID=544) recorded as
4079 ;; their owner. Rewriting them will still preserve the
4080 ;; owner.
4084 ;; On BSD-derived systems files always inherit the parent
4085 ;; directory's group, so skip the group-gid test.
4091 ;; On some systems, a file created in a setuid directory
4092 ;; inherits that directory's owner.
4096 ;; On many systems, a file created in a setgid directory
4097 ;; inherits that directory's group. On some systems
4098 ;; this happens even if the setgid bit is not set.
4105 The extension, in a file name, is the part that follows the last `.',
4106 except that a leading `.', if any, doesn't count."
4109 directory)
4113 ;; Don't use expand-file-name here; if DIRECTORY is relative,
4114 ;; we don't want to expand it.
4117 filename))))
4121 The extension, in a file name, is the part that follows the last `.',
4122 excluding version numbers and backup suffixes,
4123 except that a leading `.', if any, doesn't count.
4124 Return nil for extensionless file names such as `foo'.
4125 Return the empty string for file names such as `foo.'.
4127 If PERIOD is non-nil, then the returned value includes the period
4128 that delimits the extension, and if FILENAME has no extension,
4139 "Return the base name of the FILENAME: no directory, no extension.
4140 FILENAME defaults to `buffer-file-name'."
4145 "A function to use instead of the default `make-backup-file-name'.
4146 A value of nil gives the default `make-backup-file-name' behavior.
4148 This could be buffer-local to do something special for specific
4149 files. If you define it, you may need to change `backup-file-name-p'
4150 and `file-name-sans-versions' too.
4152 See also `backup-directory-alist'."
4158 "Alist of filename patterns and backup directory names.
4159 Each element looks like (REGEXP . DIRECTORY). Backups of files with
4160 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
4161 relative or absolute. If it is absolute, so that all matching files
4162 are backed up into the same directory, the file names in this
4163 directory will be the full name of the file backed up with all
4164 directory separators changed to `!' to prevent clashes. This will not
4165 work correctly if your filesystem truncates the resulting name.
4167 For the common case of all backups going into one directory, the alist
4169 directory name.
4171 If this variable is nil, or it fails to match a filename, the backup
4172 is made in the original file's directory.
4174 On MS-DOS filesystems without long names this variable is always
4175 ignored."
4181 "Default `backup-enable-predicate' function.
4182 Checks for files in `temporary-file-directory',
4183 `small-temporary-file-directory', and /tmp."
4185 caseless)
4186 ;; On MS-Windows, file-truename will convert short 8+3 aliases to
4187 ;; their long file-name equivalents, so compare-strings does TRT.
4191 caseless t))
4194 ;; Directory is under temporary-file-directory.
4199 ;; Directory is under /tmp.
4204 0 nil
4206 ;; Directory is under small-temporary-file-directory.
4211 "Create the non-numeric backup file name for FILE.
4212 Normally this will just be the file's name with `~' appended.
4213 Customization hooks are provided as follows.
4215 If the variable `make-backup-file-name-function' is non-nil, its value
4216 should be a function which will be called with FILE as its argument;
4217 the resulting name is used.
4219 Otherwise a match for FILE is sought in `backup-directory-alist'; see
4220 the documentation of that variable. If the directory for the backup
4221 doesn't exist, it is created."
4235 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
4237 elt backup-directory abs-backup-directory)
4242 alist nil)))
4243 ;; If backup-directory is relative, it should be relative to the
4244 ;; file's directory. By expanding explicitly here, we avoid
4245 ;; depending on default-directory.
4254 abs-backup-directory nil))))
4256 file
4260 ;; Normalize DOSish file names: downcase the drive
4261 ;; letter, if any, and replace the leading "x:" with
4262 ;; "/drive_x".
4265 ;; Replace any invalid file-name characters (for the
4266 ;; case of backing up remote files).
4270 "drive_"
4273 ""
4276 ;; Make the name unique by substituting directory
4277 ;; separators. It may not really be worth bothering about
4278 ;; doubling `!'s in the original name...
4283 backup-directory))
4288 "Return non-nil if FILE is a backup file name (numeric or not).
4289 This is a separate function so you can redefine it for customization.
4290 You may need to redefine `file-name-sans-versions' as well."
4295 ;; This is used in various files.
4296 ;; The usage of backup-extract-version-start is not very clean,
4297 ;; but I can't see a good alternative, so as of now I am leaving it alone.
4299 "Given the name of a numeric backup file, FN, return the backup number.
4300 Uses the free variable `backup-extract-version-start', whose value should be
4301 the index in the name where the version number begins."
4308 "Find a file name for a backup file FN, and suggestions for deletions.
4309 Value is a list whose car is the name for the backup file
4310 and whose cdr is a list of old versions to consider deleting now.
4311 If the value is nil, don't make a backup.
4312 Uses `backup-directory-alist' in the same way as does
4313 `make-backup-file-name'."
4315 ;; Run a handler for this function so that ange-ftp can refuse to do it.
4319 ;; We don't support numbered backups on plain MS-DOS
4320 ;; when long file names are unavailable.
4330 possibilities deserve-versions-p versions)
4333 base-versions
4336 possibilities)
4337 #'<)
4342 kept-old-versions
4343 kept-new-versions
4350 ;; Delete nothing if there is overflow
4351 ;; in the number of versions to keep.
4357 v))))))))))
4360 "Return number of names file FILENAME has."
4363 ;; (defun file-relative-name (filename &optional directory)
4364 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4365 ;; This function returns a relative file name which is equivalent to FILENAME
4366 ;; when used with that default directory as the default.
4367 ;; If this is impossible (which can happen on MSDOS and Windows
4368 ;; when the file name and directory use different drive names)
4369 ;; then it returns FILENAME."
4370 ;; (save-match-data
4371 ;; (let ((fname (expand-file-name filename)))
4372 ;; (setq directory (file-name-as-directory
4373 ;; (expand-file-name (or directory default-directory))))
4374 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
4375 ;; ;; drive names, they can't be relative, so return the absolute name.
4376 ;; (if (and (or (eq system-type 'ms-dos)
4377 ;; (eq system-type 'cygwin)
4378 ;; (eq system-type 'windows-nt))
4379 ;; (not (string-equal (substring fname 0 2)
4380 ;; (substring directory 0 2))))
4381 ;; filename
4382 ;; (let ((ancestor ".")
4383 ;; (fname-dir (file-name-as-directory fname)))
4384 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
4385 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
4386 ;; (setq directory (file-name-directory (substring directory 0 -1))
4387 ;; ancestor (if (equal ancestor ".")
4388 ;; ".."
4389 ;; (concat "../" ancestor))))
4390 ;; ;; Now ancestor is empty, or .., or ../.., etc.
4391 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
4392 ;; ;; We matched within FNAME's directory part.
4393 ;; ;; Add the rest of FNAME onto ANCESTOR.
4394 ;; (let ((rest (substring fname (match-end 0))))
4395 ;; (if (and (equal ancestor ".")
4396 ;; (not (equal rest "")))
4397 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
4398 ;; rest
4399 ;; (concat (file-name-as-directory ancestor) rest)))
4400 ;; ;; We matched FNAME's directory equivalent.
4401 ;; ancestor))))))
4404 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4405 This function returns a relative file name which is equivalent to FILENAME
4406 when used with that default directory as the default.
4407 If FILENAME and DIRECTORY lie on different machines or on different drives
4408 on a DOS/Windows machine, it returns FILENAME in expanded form."
4412 default-directory))))
4417 read-file-name-completion-ignore-case)))
4420 ;; Test for different filesystems on DOS/Windows
4422 ;; Should `cygwin' really be included here? --stef
4425 ;; Test for different drive letters
4427 ;; Test for UNCs on different servers
4432 ;; Windows file names cannot have ? in
4433 ;; them, so use that to detect when
4434 ;; neither FILENAME nor DIRECTORY is a
4435 ;; UNC.
4437 0 nil
4443 ;; Test for different remote file system identification
4445 filename
4451 directory nil nil fold-case))
4453 directory nil nil fold-case))))
4456 ".."
4458 ;; Now ancestor is empty, or .., or ../.., etc.
4460 directory nil nil fold-case))
4461 ;; We matched within FILENAME's directory part.
4462 ;; Add the rest of FILENAME onto ANCESTOR.
4465 ;; But don't bother with ANCESTOR if it would give us `./'.
4466 rest
4468 ;; We matched FILENAME's directory equivalent.
4469 ancestor))))))
4470 \f
4472 "Save current buffer in visited file if modified.
4473 Variations are described below.
4475 By default, makes the previous version into a backup file
4476 if previously requested or if this is the first save.
4478 to become a backup when the next save is done.
4480 unconditionally makes the previous version into a backup file.
4482 to become a backup when the next save is done,
4483 and unconditionally makes the previous version into a backup file.
4485 With a numeric argument of 0, never make the previous version
4486 into a backup file.
4488 If a file's name is FOO, the names of its numbered backup versions are
4489 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
4490 Numeric backups (rather than FOO~) will be made if value of
4491 `version-control' is not the atom `never' and either there are already
4492 numeric versions of the file being backed up, or `version-control' is
4493 non-nil.
4494 We don't want excessive versions piling up, so there are variables
4495 `kept-old-versions', which tells Emacs how many oldest versions to keep,
4496 and `kept-new-versions', which tells how many newest versions to keep.
4497 Defaults are 2 old versions and 2 new.
4498 `dired-kept-versions' controls dired's clean-directory (.) command.
4499 If `delete-old-versions' is nil, system will query user
4500 before trimming versions. Otherwise it does it silently.
4502 If `vc-make-backup-files' is nil, which is the default,
4503 no backup files are made for files managed by version control.
4504 (This is because the version control system itself records previous versions.)
4506 See the subroutine `basic-save-buffer' for more information."
4512 ;; We used to display the message below only for files > 50KB, but
4513 ;; then Rmail-mbox never displays it due to buffer swapping. If
4514 ;; the test is ever re-introduced, be sure to handle saving of
4515 ;; Rmail files.
4522 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
4523 Normally delete only if the file was written by this Emacs since
4524 the last real save, but optional arg FORCE non-nil means delete anyway."
4538 "Normal hook that is run before a buffer is saved to its file."
4544 "Normal hook that is run after a buffer is saved to its file."
4550 "If non-nil, use this coding system for saving the buffer.
4551 More precisely, use this coding system in place of the
4552 value of `buffer-file-coding-system', when saving the buffer.
4553 Calling `write-region' for any purpose other than saving the buffer
4554 will still use `buffer-file-coding-system'; this variable has no effect
4561 "Save the current buffer in its visited file, if it has been modified.
4562 The hooks `write-contents-functions' and `write-file-functions' get a chance
4563 to do the job of saving; if they do not, then the buffer is saved in
4564 the visited file in the usual way.
4565 Before and after saving the buffer, this function runs
4566 `before-save-hook' and `after-save-hook', respectively."
4569 ;; In an indirect buffer, save its base buffer instead.
4573 ;; handle the case when no modification has been made but
4574 ;; the file disappeared since visited
4578 setmodes)
4579 ;; If buffer has no file name, ask user for one.
4587 ;; Signal an error if the user specified the name of an
4588 ;; existing directory.
4591 filename))
4598 "%s has changed since visited or saved. Save anyway? "
4618 ;; Support VC version backups.
4620 ;; Don't let errors prevent saving the buffer.
4625 ;; If a hook returned t, file is already "written".
4626 ;; Otherwise, write it the usual way now.
4635 ;; Now we have saved the current buffer. Let's make sure
4636 ;; that buffer-file-coding-system is fixed to what
4637 ;; actually used for saving by binding it locally.
4652 ;; If the auto-save file was recent before this command,
4653 ;; delete it now.
4655 ;; Support VC `implicit' locking.
4660 ;; This does the "real job" of writing a buffer into its visited file
4661 ;; and making a backup file. This is what is normally done
4662 ;; but inhibited if one of write-file-functions returns non-nil.
4663 ;; It returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4664 ;; backup-buffer.
4674 ;; This returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4675 ;; backup-buffer.
4688 "File %s is write-protected; try to save anyway? "
4690 buffer-file-name)))
4693 ;; This may involve prompting, so do it now before backing up the file.
4694 ;; Otherwise there can be a delay while the user answers the
4695 ;; prompt during which the original file has been renamed. (Bug#13522)
4697 ;; Args here should match write-region call below around
4698 ;; which we use writecoding.
4700 buffer-file-truename))
4713 ;; Write temp name, then rename it.
4714 ;; This requires write access to the containing dir,
4715 ;; which is why we don't try it if we don't have that access.
4717 tempname succeed
4720 ;; Create temp files with strict access rights. It's easy to
4721 ;; loosen them later, whereas it's impossible to close the
4722 ;; time-window of loose permissions otherwise.
4727 ;; Try various temporary names.
4728 ;; This code follows the example of make-temp-file,
4729 ;; but it calls write-region in the appropriate way
4730 ;; for saving the buffer.
4736 ;; Pass in nil&nil rather than point-min&max
4737 ;; cause we're saving the whole buffer.
4738 ;; write-region-annotate-functions may use it.
4740 tempname nil realname
4742 nil)
4744 ;; The file was somehow created by someone else between
4745 ;; `make-temp-name' and `write-region', let's try again.
4746 nil)
4748 ;; Reset the umask.
4750 ;; If we failed, restore the buffer's modtime.
4753 ;; Since we have created an entirely new file,
4754 ;; make sure it gets the right permission bits set.
4759 buffer-file-name)))
4760 ;; We succeeded in writing the temp file,
4761 ;; so rename it.
4763 ;; If file not writable, see if we can make it writable
4764 ;; temporarily while we write it.
4765 ;; But no need to do so if we have just backed it up
4766 ;; (setmodes is set) because that says we're superseding.
4768 ;; Change the mode back, after writing.
4771 buffer-file-name))
4772 ;; If set-file-extended-attributes fails, fall back on
4773 ;; set-file-modes.
4782 ;; Pass in nil&nil rather than point-min&max to indicate
4783 ;; we're saving the buffer rather than just a region.
4784 ;; write-region-annotate-functions may make us of it.
4788 buffer-file-name nil t buffer-file-truename)
4790 ;; If we get an error writing the new file, and we made
4791 ;; the backup by renaming, undo the backing-up.
4796 setmodes))
4802 `((?\C-r
4809 ;; Return nil to ask about BUF again.
4810 nil)
4823 ;; Return nil to ask about BUF again.
4824 nil)
4834 "Save some modified file-visiting buffers. Asks user about each one.
4835 You can answer `y' to save, `n' not to save, `C-r' to look at the
4836 buffer in question with `view-buffer' before deciding or `d' to
4837 view the differences using `diff-buffer-with-file'.
4839 This command first saves any buffers where `buffer-save-without-query' is
4840 non-nil, without asking.
4842 Optional argument (the prefix) non-nil means save all with no questions.
4843 Optional second argument PRED determines which buffers are considered:
4844 If PRED is nil, all the file-visiting buffers are considered.
4845 If PRED is t, then certain non-file buffers will also be considered.
4846 If PRED is a zero-argument function, it indicates for each buffer whether
4847 to consider it or not when called with that buffer current.
4849 See `save-some-buffers-action-alist' if you want to
4850 change the additional actions you can take on files."
4854 files-done abbrevs-done)
4856 ;; First save any buffers that we're supposed to save unconditionally.
4857 ;; That way the following code won't ask about them.
4862 ;; Ask about those buffers that merit it,
4863 ;; and record the number thus saved.
4867 ;; Note that killing some buffers may kill others via
4868 ;; hooks (e.g. Rmail and its viewing buffer).
4881 t
4893 save-some-buffers-action-alist))
4894 ;; Maybe to save abbrevs, and record whether
4895 ;; we either saved them or asked to.
4902 ;; Don't keep bothering user if he says no.
4915 \f
4917 "Mark current buffer as unmodified, not needing to be saved.
4920 It is not a good idea to use this function in Lisp programs, because it
4921 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
4935 "Insert contents of file FILENAME into buffer after point.
4936 Set mark after the inserted text.
4938 This function is meant for the user to run interactively.
4939 Don't call it from programs! Use `insert-file-contents' instead.
4940 \(Its calling sequence is different; see its documentation)."
4945 "Append the contents of the region to the end of file FILENAME.
4946 When called from a function, expects three arguments,
4947 START, END and FILENAME. START and END are normally buffer positions
4948 specifying the part of the buffer to write.
4949 If START is nil, that means to use the entire buffer contents.
4950 If START is a string, then output that string to the file
4951 instead of any buffer contents; END is ignored.
4953 This does character code conversion and applies annotations
4954 like `write-region' does."
4959 "Return most recent backup file for FILENAME or nil if no backups exist."
4960 ;; `make-backup-file-name' will get us the right directory for
4961 ;; ordinary or numeric backups. It might create a directory for
4962 ;; backups as a side-effect, according to `backup-directory-alist'.
4969 tem)
4978 newest))
4981 "Rename current buffer to a similar name not already taken.
4982 This function is useful for creating multiple shell process buffers
4983 or multiple mail buffers, etc.
4985 Note that some commands, in particular those based on `compilation-mode'
4986 \(`compile', `grep', etc.) will reuse the current buffer if it has the
4987 appropriate mode even if it has been renamed. So as well as renaming
4988 the buffer, you also need to switch buffers before running another
4989 instance of such commands."
4997 ;; If the existing buffer name has a <NNN>,
4998 ;; which isn't part of the file name (if any),
4999 ;; then get rid of that.
5005 "Create the directory DIR and optionally any nonexistent parent dirs.
5006 If DIR already exists as a directory, signal an error, unless
5007 PARENTS is non-nil.
5009 Interactively, the default choice of directory to create is the
5010 current buffer's default directory. That is useful when you have
5011 visited a file in a nonexistent directory.
5013 Noninteractively, the second (optional) argument PARENTS, if
5014 non-nil, says whether to create parent directories that don't
5015 exist. Interactively, this happens by default.
5017 If creating the directory or directories fail, an error will be
5018 raised."
5021 nil nil)
5022 t))
5023 ;; If default-directory is a remote directory,
5024 ;; make sure we find its make-directory handler.
5032 create-list)
5034 ;; If directory is its own parent, then we can't
5035 ;; keep looping forever
5050 "Delete the directory named DIRECTORY. Does not follow symlinks.
5051 If RECURSIVE is non-nil, all files in DIRECTORY are deleted as well.
5052 TRASH non-nil means to trash the directory instead, provided
5053 `delete-by-moving-to-trash' is non-nil.
5055 When called interactively, TRASH is t if no prefix argument is
5056 given. With a prefix argument, TRASH is nil."
5063 "Move directory to trash: "
5065 default-directory default-directory nil nil))))
5071 nil)
5073 ;; If default-directory is a remote directory, make sure we find its
5074 ;; delete-directory handler.
5081 ;; Only move non-empty dir to trash if recursive deletion was
5082 ;; requested. This mimics the non-`delete-by-moving-to-trash'
5083 ;; case, where the operation fails in delete-directory-internal.
5084 ;; As `move-file-to-trash' trashes directories (empty or
5085 ;; otherwise) as a unit, we do not need to recurse here.
5087 ;; Check if directory is empty apart from "." and "..".
5092 ;; Otherwise, call ourselves recursively if needed.
5096 ;; This test is equivalent to
5097 ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
5098 ;; but more efficient
5102 ;; We do not want to delete "." and "..".
5108 "Return non-nil if files FILE1 and FILE2 name the same file.
5109 If FILE1 or FILE2 does not exist, the return value is unspecified."
5120 "Return non-nil if FILE is in DIR or a subdirectory of DIR.
5122 Return nil if DIR is not an existing directory."
5144 "Copy DIRECTORY to NEWNAME. Both args must be strings.
5145 This function always sets the file modes of the output files to match
5146 the corresponding input file.
5148 The third arg KEEP-TIME non-nil means give the output files the same
5149 last-modified time as the old ones. (This works on only some systems.)
5151 A prefix arg makes KEEP-TIME non-nil.
5153 Noninteractively, the last argument PARENTS says whether to
5154 create parent directories if they don't exist. Interactively,
5155 this happens by default.
5157 If NEWNAME names an existing directory, copy DIRECTORY as a
5158 subdirectory there. However, if called from Lisp with a non-nil
5159 optional argument COPY-CONTENTS, copy the contents of DIRECTORY
5160 directly into NEWNAME instead."
5167 default-directory default-directory nil nil)
5168 current-prefix-arg t nil)))
5171 directory newname))
5172 ;; If default-directory is a remote directory, make sure we find its
5173 ;; copy-directory handler.
5178 newname keep-time parents copy-contents)
5180 ;; Compute target name.
5185 ;; If NEWNAME is not an existing directory, create it;
5186 ;; that is where we will copy the files of DIRECTORY.
5188 ;; If NEWNAME is an existing directory and COPY-CONTENTS
5189 ;; is nil, copy into NEWNAME/[DIRECTORY-BASENAME].
5194 newname))
5198 newname))
5201 ;; Copy recursively.
5203 ;; We do not want to copy "." and "..".
5205 directory-files-no-dot-files-regexp))
5215 ;; Set directory attributes.
5221 \f
5222 ;; At time of writing, only info uses this.
5224 "Return a copy of DIRS with all non-existent directories removed.
5225 The optional argument KEEP is a list of directories to retain even if
5226 they don't exist, and REJECT is a list of directories to remove from
5227 DIRS, even if they exist; REJECT takes precedence over KEEP.
5229 Note that membership in REJECT and KEEP is checked using simple string
5230 comparison."
5236 dirs)))
5238 \f
5241 "Function to use to revert this buffer, or nil to do the default.
5242 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
5247 "Function to use to insert contents when reverting this buffer.
5248 Gets two args, first the nominal file name to use,
5249 and second, t if reading the auto-save file.
5254 "Function to check whether a non-file buffer needs reverting.
5255 This should be a function with one optional argument NOCONFIRM.
5256 Auto Revert Mode passes t for NOCONFIRM. The function should return
5257 non-nil if the buffer should be reverted. A return value of
5258 `fast' means that the need for reverting was not checked, but
5259 that reverting the buffer is fast. The buffer is current when
5260 this function is called.
5262 The idea behind the NOCONFIRM argument is that it should be
5263 non-nil if the buffer is going to be reverted without asking the
5264 user. In such situations, one has to be careful with potentially
5265 time consuming operations.
5267 For more information on how this variable is used by Auto Revert mode,
5271 "Normal hook for `revert-buffer' to run before reverting.
5272 If `revert-buffer-function' is used to override the normal revert
5276 "Normal hook for `revert-buffer' to run after reverting.
5277 Note that the hook value that it runs is the value that was in effect
5278 before reverting; that makes a difference if you have buffer-local
5279 hook functions.
5281 If `revert-buffer-function' is used to override the normal revert
5285 "Non-nil if a `revert-buffer' operation is in progress, nil otherwise.
5291 "Replace current buffer text with the text of the visited file on disk.
5292 This undoes all changes since the file was visited or saved.
5293 With a prefix argument, offer to revert from latest auto-save file, if
5294 that is more recent than the visited file.
5296 This command also implements an interface for special buffers
5297 that contain text which doesn't come from a file, but reflects
5298 some other data instead (e.g. Dired buffers, `buffer-list'
5299 buffers). This is done via the variable `revert-buffer-function'.
5300 In these cases, it should reconstruct the buffer contents from the
5301 appropriate data.
5303 When called from Lisp, the first argument is IGNORE-AUTO; only offer
5304 to revert from the auto-save file when this is nil. Note that the
5305 sense of this argument is the reverse of the prefix argument, for the
5306 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
5307 to nil.
5309 Optional second argument NOCONFIRM means don't ask for confirmation
5310 at all. (The variable `revert-without-query' offers another way to
5311 revert buffers without querying for confirmation.)
5313 Optional third argument PRESERVE-MODES non-nil means don't alter
5314 the files modes. Normally we reinitialize them using `normal-mode'.
5316 This function binds `revert-buffer-in-progress-p' non-nil while it operates.
5318 If the value of `revert-buffer-function' is non-nil, it is called to
5319 do all the work for this command. Otherwise, the hooks
5320 `before-revert-hook' and `after-revert-hook' are run at the beginning
5321 and the end, and if `revert-buffer-insert-file-contents-function' is
5322 non-nil, it is called instead of rereading visited file contents."
5324 ;; I admit it's odd to reverse the sense of the prefix argument, but
5325 ;; there is a lot of code out there which assumes that the first
5326 ;; argument should be t to avoid consulting the auto-save file, and
5327 ;; there's no straightforward way to encourage authors to notice a
5328 ;; reversal of the argument sense. So I'm just changing the user
5329 ;; interface, but leaving the programmatic interface the same.
5339 buffer-auto-save-file-name
5344 buffer-auto-save-file-name
5345 buffer-file-name)))
5355 file-name)))
5357 ;; If file was backed up but has changed since,
5358 ;; we should make another backup.
5362 ;; Effectively copy the after-revert-hook status,
5363 ;; since after-find-file will clobber it.
5366 after-revert-hook))
5371 ;; Get rid of all undo records for this buffer.
5373 ;; Don't make undo records for the reversion.
5376 file-name auto-save-p)))
5379 "File %s no longer exists!"
5381 file-name))
5384 "File %s no longer readable!"
5386 file-name))
5388 ;; Bind buffer-file-name to nil
5389 ;; so that we don't try to lock the file.
5395 ;; Auto-saved file should be read by Emacs's
5396 ;; internal coding.
5400 buffer-file-coding-system-explicit
5403 coding-system-for-read
5405 coding-system-for-read)
5407 ;; As a coding system suitable for multibyte
5408 ;; buffer is specified, make the current
5409 ;; buffer multibyte.
5412 ;; This force after-insert-file-set-coding
5413 ;; (called from insert-file-contents) to set
5414 ;; buffer-file-coding-system to a proper value.
5417 ;; Note that this preserves point in an intelligent way.
5421 nil nil t))
5423 nil nil t)))))
5424 ;; Recompute the truename in case changes in symlinks
5425 ;; have changed the truename.
5429 ;; Run after-revert-hook as it was before we reverted.
5433 local-hook)
5436 t))))))
5439 "Recover the visited file--get contents from its last auto-save file."
5444 "Visit file FILE, but get contents from its last auto-save file."
5445 ;; Actually putting the file name in the minibuffer should be used
5446 ;; only rarely.
5447 ;; Not just because users often use the default.
5460 "*Directory*" nil
5471 ;; Use insert-directory-safely, not insert-directory,
5472 ;; because these files might not exist. In particular,
5473 ;; FILE might not exist if the auto-save file was for
5474 ;; a buffer that didn't visit a file, such as "*mail*".
5475 ;; The code in v20.x called `ls' directly, so we need
5476 ;; to emulate what `ls' did in that case.
5481 ;; Keep the current buffer-file-coding-system.
5483 ;; Auto-saved file should be read with special coding.
5492 "Recover auto save files from a previous Emacs session.
5493 This command first displays a Dired buffer showing you the
5494 previous sessions that you could recover from.
5495 To choose one, move point to the proper line and then type C-c C-c.
5496 Then you'll be asked about a number of files to recover."
5506 auto-save-list-file-prefix)))
5507 t)
5518 ;; Each line starts with a space
5519 ;; so that Font Lock mode won't highlight the first character.
5522 " To delete a session file, type \
5528 "Choose one saved session to recover auto-save files from.
5529 This command is used in the special Dired buffer created by
5532 ;; Get the name of the session file to recover from.
5534 files
5540 ;; Read in the auto-save-list file.
5543 ;; Loop thru the text of that file
5544 ;; and get out the names of the files to recover.
5548 ;; This is a pair of lines for a non-file-visiting buffer.
5549 ;; Get the auto-save file name and manufacture
5550 ;; a "visited file name" from that.
5553 ;; If there is no auto-save file name, the
5554 ;; auto-save-list file is probably corrupted.
5567 ;; This pair of lines is a file-visiting
5568 ;; buffer. Use the visited file name.
5578 ;; Ignore a file if its auto-save file does not exist now.
5582 ;; The file contains a pair of line for each auto-saved buffer.
5583 ;; The first line of the pair contains the visited file name
5584 ;; or is empty if the buffer was not visiting a file.
5585 ;; The second line is the auto-save file name.
5593 files
5599 "Kill BUFFER if confirmed."
5607 "Kill some buffers. Asks the user whether to kill each one of them.
5608 Non-interactively, if optional argument LIST is non-nil, it
5609 specifies the list of buffers to kill, asking for approval for each one."
5617 ; if we killed the base buffer.
5624 "Kill buffers whose name matches the specified REGEXP.
5625 The optional second argument indicates whether to kill internal buffers too."
5634 \f
5636 "Adjust current buffer's auto save file name for current conditions.
5637 Also rename any existing auto save file, if it was made in this session."
5649 "Return file name to use for auto-saves of current buffer.
5650 Does not consider `auto-save-visited-file-name' as that variable is checked
5651 before calling this function. You can redefine this for customization.
5652 See also `auto-save-file-name-p'."
5660 result uniq)
5661 ;; Apply user-specified translations
5662 ;; to the file name.
5666 filename)
5676 filename))))
5681 ;; We truncate the file name to DOS 8+3 limits
5682 ;; before doing anything else, because the regexp
5683 ;; passed to string-match below cannot handle
5684 ;; extensions longer than 3 characters, multiple
5685 ;; dots, and other atrocities.
5690 fn)
5695 "#"
5698 ;; Make sure auto-save file names don't contain characters
5699 ;; invalid for the underlying filesystem.
5701 ;; Don't modify remote (ange-ftp) filenames
5704 result))))
5706 ;; Deal with buffers that don't have any associated files. (Mail
5707 ;; mode tends to create a good number of these.)
5711 file-name)
5712 ;; Restrict the characters used in the file name to those which
5713 ;; are known to be safe on all filesystems, url-encoding the
5714 ;; rest.
5715 ;; We do this on all platforms, because even if we are not
5716 ;; running on DOS/Windows, the current directory may be on a
5717 ;; mounted VFAT filesystem, such as a USB memory stick.
5721 ;; For multibyte characters, this will produce more than
5722 ;; 2 hex digits, so is not true URL encoding.
5726 ;; Generate the file name.
5732 ;; Try a few alternative directories, to get one we can
5733 ;; write it.
5739 ;; Don't modify remote (ange-ftp) filenames
5741 ;; The call to convert-standard-filename is in case
5742 ;; buffer-name includes characters not allowed by the
5743 ;; DOS/Windows filesystems. make-temp-file writes to the
5744 ;; file it creates, so we must fix the file name _before_
5745 ;; make-temp-file is called.
5747 fname))
5749 ;; make-temp-file creates the file,
5750 ;; but we don't want it to exist until we do an auto-save.
5754 file-name)))
5757 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
5758 FILENAME should lack slashes. You can redefine this for customization."
5760 \f
5762 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
5763 The generated regexp will match a filename only if the filename
5764 matches that wildcard according to shell rules. Only wildcards known
5765 by `sh' are supported."
5767 ;; Copy the initial run of non-special characters.
5770 ;; If no special characters, we're almost done.
5774 j)
5776 result
5797 ;; Found "[^". Insert a `\0' character
5798 ;; (which cannot happen in a filename)
5799 ;; into the character class, so that `^'
5800 ;; is not the first character after `[',
5801 ;; and thus non-special in a regexp.
5806 ;; I don't think `]' can appear in a
5807 ;; character class in a wildcard, but
5808 ;; let's be general here.
5815 i
5828 ;; Shell wildcards should match the entire filename,
5829 ;; not its part. Make the regexp say so.
5831 \f
5834 "Switches for `list-directory' to pass to `ls' for brief listing."
5840 "Switches for `list-directory' to pass to `ls' for verbose listing."
5845 "Expand wildcard pattern PATTERN.
5846 This returns a list of file names which match the pattern.
5848 If PATTERN is written as an absolute file name,
5849 the values are absolute also.
5851 If PATTERN is written as a relative file name, it is interpreted
5852 relative to the current default directory, `default-directory'.
5853 The file names returned are normally also relative to the current
5854 default directory. However, if FULL is non-nil, they are absolute."
5858 ;; A list of all dirs that DIRPART specifies.
5859 ;; This can be more than one dir
5860 ;; if DIRPART contains wildcards.
5864 dirpart)))
5868 contents)
5874 ;; Filter out "." and ".."
5879 name))
5886 this-dir-contents)
5887 this-dir-contents)
5888 contents))))
5890 contents)))
5892 ;; Let Tramp know that `file-expand-wildcards' does not need an advice.
5896 "Display a list of files in or matching DIRNAME, a la `ls'.
5897 DIRNAME is globbed by the shell if necessary.
5898 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
5899 Actions controlled by variables `list-directory-brief-switches'
5900 and `list-directory-verbose-switches'."
5904 nil default-directory nil)
5905 pfx)))
5907 list-directory-brief-switches))
5908 buffer)
5920 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
5928 "Quote characters special to the shell in PATTERN, leave wildcards alone.
5930 PATTERN is assumed to represent a file-name wildcard suitable for the
5931 underlying filesystem. For Unix and GNU/Linux, each character from the
5933 the parts of the pattern which don't include wildcard characters are
5934 quoted with double quotes.
5937 on Windows), so PATTERN can use them to quote wildcard characters that
5938 need to be passed verbatim to shell commands."
5942 ;; DOS/Windows don't allow `"' in file names. So if the
5943 ;; argument has quotes, we can safely assume it is already
5944 ;; quoted by the caller.
5946 ;; We quote [&()#$'] in case their shell is a port of a
5947 ;; Unixy shell. We quote [,=+] because stock DOS and
5948 ;; Windows shells require that in some cases, such as
5949 ;; passing arguments to batch files that use positional
5950 ;; arguments like %1.
5952 pattern
5955 end)
5972 pattern))))
5979 "Program to get the amount of free space on a file system.
5980 We assume the output has the format of `df'.
5981 The value of this variable must be just a command name or file name;
5982 if you want to specify options, use `directory-free-space-args'.
5984 A value of nil disables this feature.
5986 If the function `file-system-info' is defined, it is always used in
5987 preference to the program given by this variable."
5993 "Options to use when running `directory-free-space-program'."
5998 "Return the amount of free space on directory DIR's file system.
5999 The return value is a string describing the amount of free
6000 space (normally, the number of free 1KB blocks).
6002 This function calls `file-system-info' if it is available, or
6003 invokes the program specified by `directory-free-space-program'
6004 and `directory-free-space-args'. If the system call or program
6005 is unsuccessful, or if DIR is a remote directory, this function
6006 returns nil."
6008 ;; Try to find the number of free blocks. Non-Posix systems don't
6009 ;; always have df, but might have an equivalent system call.
6018 ;; Avoid failure if the default directory does
6019 ;; not exist (Bug#2631, Bug#3911).
6023 nil t nil
6024 directory-free-space-args
6027 ;; Assume that the "available" column is before the
6028 ;; "capacity" column. Find the "%" and scan backward.
6032 "[[:space:]]+[^[:space:]]+%[^%]*$"
6039 ;; The following expression replaces `dired-move-to-filename-regexp'.
6043 ;; In some locales, month abbreviations are as short as 2 letters,
6044 ;; and they can be followed by ".".
6045 ;; In Breton, a month name can include a quote character.
6058 s "+"
6061 ;; Japanese MS-Windows ls-lisp has one-digit months, and
6062 ;; omits the Kanji characters after month and day-of-month.
6063 ;; On Mac OS X 10.3, the date format in East Asian locales is
6064 ;; day-of-month digits followed by month digits.
6070 ;; The "[0-9]" below requires the previous column to end in a digit.
6071 ;; This avoids recognizing `1 may 1997' as a date in the line:
6072 ;; -r--r--r-- 1 may 1997 1168 Oct 19 16:49 README
6074 ;; The "[BkKMGTPEZY]?" below supports "ls -alh" output.
6076 ;; For non-iso date formats, we add the ".*" in order to find
6077 ;; the last possible match. This avoids recognizing
6078 ;; `jservice 10 1024' as a date in the line:
6079 ;; drwxr-xr-x 3 jservice 10 1024 Jul 2 1997 esg-host
6081 ;; vc dired listings provide the state or blanks between file
6082 ;; permissions and date. The state is always surrounded by
6083 ;; parentheses:
6084 ;; -rw-r--r-- (modified) 2005-10-22 21:25 files.el
6085 ;; This is not supported yet.
6090 "Regular expression to match up to the file name in a directory listing.
6091 The default value is designed to recognize dates and times
6096 ;; insert-directory
6097 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
6098 ;; FULL-DIRECTORY-P is nil.
6099 ;; The single line of output must display FILE's name as it was
6100 ;; given, namely, an absolute path name.
6101 ;; - must insert exactly one line for each file if WILDCARD or
6102 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
6103 ;; before the file lines, plus optional text after the file lines.
6104 ;; Lines are delimited by "\n", so filenames containing "\n" are not
6105 ;; allowed.
6106 ;; File lines should display the basename.
6107 ;; - must be consistent with
6108 ;; - functions dired-move-to-filename, (these two define what a file line is)
6109 ;; dired-move-to-end-of-filename,
6110 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
6111 ;; dired-insert-headerline
6112 ;; dired-after-subdir-garbage (defines what a "total" line is)
6113 ;; - variable dired-subdir-regexp
6114 ;; - may be passed "--dired" as the first argument in SWITCHES.
6115 ;; Filename handlers might have to remove this switch if their
6116 ;; "ls" command does not support it.
6118 "Insert directory listing for FILE, formatted according to SWITCHES.
6119 Leaves point after the inserted text.
6120 SWITCHES may be a string of options, or a list of strings
6121 representing individual options.
6122 Optional third arg WILDCARD means treat FILE as shell wildcard.
6123 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
6124 switches do not contain `d', so that a full listing is expected.
6126 This works by running a directory listing program
6127 whose name is in the variable `insert-directory-program'.
6128 If WILDCARD, it also runs the shell specified by `shell-file-name'.
6130 When SWITCHES contains the long `--dired' option, this function
6131 treats it specially, for the sake of dired. However, the
6132 normally equivalent short `-D' option is just passed on to
6133 `insert-directory-program', as any other option."
6134 ;; We need the directory in order to find the right handler.
6139 wildcard full-directory-p)
6142 ;; Read the actual directory using `insert-directory-program'.
6143 ;; RESULT gets the status code.
6145 ;; putting text property `dired-filename, decode one
6146 ;; bunch by one to preserve that property.
6148 ;; This is to control encoding the arguments in call-process.
6152 default-file-name-coding-system))))
6155 ;; Run ls in the directory part of the file pattern
6156 ;; using the last component as argument.
6162 ;; NB since switches is passed to the shell, be
6163 ;; careful of malicious values, eg "-l;reboot".
6164 ;; See eg dired-safe-switches-p.
6166 shell-file-name nil t nil
6167 "-c"
6169 ""
6171 insert-directory-program
6172 " -d "
6174 switches
6176 " -- "
6177 ;; Quote some characters that have
6178 ;; special meanings in shells; but
6179 ;; don't quote the wildcards--we want
6180 ;; them to be special. We also
6181 ;; currently don't quote the quoting
6182 ;; characters in case people want to
6183 ;; use them explicitly to quote
6184 ;; wildcard characters.
6186 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
6187 ;; directory if FILE is a symbolic link.
6194 insert-directory-program nil t nil
6198 ;; Split the switches at any spaces so we can
6199 ;; pass separate options as separate args.
6201 ;; Avoid lossage if FILE starts with `-'.
6209 file))))))))
6211 ;; If we got "//DIRED//" in the output, it means we got a real
6212 ;; directory listing, even if `ls' returned nonzero.
6213 ;; So ignore any errors.
6226 ;; The first time ls returns an error,
6227 ;; find the version numbers of ls,
6228 ;; and set insert-directory-ls-version
6229 ;; to > if it is more than 5.2.1, < if it is less, nil if it
6230 ;; is equal or if the info cannot be obtained.
6231 ;; (That can mean it isn't GNU ls.)
6241 comparison)
6257 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
6261 ;; If `insert-directory-program' failed, signal an error.
6263 ;; Delete the error message it may have output.
6265 ;; On non-Posix systems, we cannot open a directory, so
6266 ;; don't even try, because that will always result in
6267 ;; the ubiquitous "Access denied". Instead, show the
6268 ;; command line so the user can try to guess what went wrong.
6273 insert-directory-program
6275 file result)
6276 ;; Unix. Access the file to get a suitable error.
6283 ;; The following overshoots by one line for an empty
6284 ;; directory listed with "--dired", but without "-a"
6285 ;; switch, where the ls output contains a
6286 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
6287 ;; We take care of that case later.
6295 error-lines)
6296 ;; Find all the lines that are error messages,
6297 ;; and record the bounds of each one.
6304 ;; Now read the numeric positions of file names.
6311 error-lines))
6314 error-lines)))
6316 ;; End is followed by \n or by " -> ".
6318 ;; It seems that we can't trust ls's output as to
6319 ;; byte positions of filenames.
6325 ;; Take care of the case where the ls output contains a
6326 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
6327 ;; and we went one line too far back (see above).
6332 ;; Now decode what read if necessary.
6334 file-name-coding-system
6335 default-file-name-coding-system
6337 coding-no-eol
6338 val pos)
6342 ;; If no coding system is specified or detection is
6343 ;; requested, detect the coding.
6357 ;; Force no eol conversion on a file name, so
6358 ;; that CR is preserved.
6366 ;; Try to insert the amount of free space.
6369 ;; First find the line to put it on.
6373 ;; Replace "total" with "used", to avoid confusion.
6379 "Convert `ls --dired' file name position value POS to a buffer position.
6380 File name position values returned in ls --dired output
6381 count only stdout; they don't count the error messages sent to stderr.
6382 So this function converts to them to real buffer positions.
6383 ERROR-LINES is a list of buffer positions of error message lines,
6384 of the form (START END)."
6388 pos)
6392 "Insert directory listing for FILE, formatted according to SWITCHES.
6394 Like `insert-directory', but if FILE does not exist, it inserts a
6395 message to that effect instead of signaling an error."
6398 ;; Simulate the message printed by `ls'.
6402 "Functions to call with no arguments to query about killing Emacs.
6403 If any of these functions returns nil, killing Emacs is canceled.
6404 `save-buffers-kill-emacs' calls these functions, but `kill-emacs',
6408 "How to ask for confirmation when leaving Emacs.
6409 If nil, the default, don't ask at all. If the value is non-nil, it should
6410 be a predicate function such as `yes-or-no-p'."
6418 "Offer to save each buffer, then kill this Emacs process.
6419 With prefix ARG, silently save all file-visiting buffers without asking.
6420 If there are active processes where `process-query-on-exit-flag'
6421 returns non-nil, asks whether processes should be killed.
6422 Runs the members of `kill-emacs-query-functions' in turn and stops
6423 if any returns nil. If `confirm-kill-emacs' is non-nil, calls it."
6432 ;; process-list is not defined on MSDOS.
6434 active)
6450 ;; Query the user for other things, perhaps.
6457 "Offer to save each buffer, then kill the current connection.
6458 If the current frame has no client, kill Emacs itself.
6460 With prefix ARG, silently save all file-visiting buffers, then kill.
6462 If emacsclient was started with a list of filenames to edit, then
6463 only these files will be asked to be saved."
6468 \f
6469 ;; We use /: as a prefix to "quote" a file name
6470 ;; so that magic file name handlers will not apply to it.
6474 file-name-handler-alist))
6476 ;; We depend on being the last handler on the list,
6477 ;; so that anything else which does need handling
6478 ;; has been handled already.
6479 ;; So it is safe for us to inhibit *all* magic file name handlers.
6488 default-directory))
6489 ;; Get a list of the indices of the args which are file names.
6492 ;; The first six are special because they
6493 ;; return a file name. We want to include the /:
6494 ;; in the return value.
6495 ;; So just avoid stripping it in the first place.
6502 ;; `identity' means just return the first arg
6503 ;; not stripped of its quoting.
6505 ;; `add' means add "/:" to the result.
6508 ;; `unquote-then-quote' means set buffer-file-name
6509 ;; temporarily to unquoted filename.
6511 ;; List the arguments which are filenames.
6519 ;; For all other operations, treat the first argument only
6520 ;; as the file name.
6522 method
6523 ;; Copy ARGUMENTS so we can replace elements in it.
6527 ;; Strip off the /: from the file names that have it.
6535 "/"
6541 (`insert-file-contents
6547 (`unquote-then-quote
6552 \f
6553 ;; Symbolic modes and read-file-modes.
6556 "Convert CHAR to a numeric bit-mask for extracting mode bits.
6557 CHAR is in [ugoa] and represents the category of users (Owner, Group,
6558 Others, or All) for whom to produce the mask.
6559 The bit-mask that is returned extracts from mode bits the access rights
6560 for the specified category of users."
6568 "Convert CHAR to a numeric value of mode bits.
6569 CHAR is in [rwxXstugo] and represents symbolic access permissions.
6570 If CHAR is in [Xugo], the value is taken from FROM (or 0 if omitted)."
6577 ;; Rights relative to the previous file modes.
6588 "Convert a symbolic mode string specification to an equivalent number.
6590 WHO-MASK is the bit-mask specifying the category of users to which to
6591 apply the access permissions. See `file-modes-char-to-who'.
6592 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6593 RIGHTS request to add, remove, or set permissions based on existing ones,
6600 char-right)
6607 num-rights
6611 op char-right)))
6612 num-rights))
6615 "Convert symbolic file modes to numeric file modes.
6616 MODES is the string to convert, it should match
6618 See Info node `(coreutils)File permissions' for more information on this
6619 notation.
6620 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6621 MODES request to add, remove, or set permissions based on existing ones,
6635 num-who num-modes)
6638 num-modes)))
6641 "Read file modes in octal or symbolic notation and return its numeric value.
6642 PROMPT is used as the prompt, default to `File modes (octal or symbolic): '.
6643 ORIG-FILE is the name of a file on whose mode bits to base returned
6644 permissions if what user types requests to add, remove, or set permissions
6660 nil nil default)))
6666 \f
6667 ;; Trashcan handling.
6669 "Directory for `move-file-to-trash' to move files and directories to.
6670 This directory is only used when the function `system-move-file-to-trash'
6671 is not defined.
6672 Relative paths are interpreted relative to `default-directory'.
6673 If the value is nil, Emacs uses a freedesktop.org-style trashcan."
6683 "Move the file (or directory) named FILENAME to the trash.
6684 When `delete-by-moving-to-trash' is non-nil, this function is
6685 called by `delete-file' and `delete-directory' instead of
6686 deleting files outright.
6688 If the function `system-move-file-to-trash' is defined, call it
6689 with FILENAME as an argument.
6690 Otherwise, if `trash-directory' is non-nil, move FILENAME to that
6691 directory.
6692 Otherwise, trash FILENAME using the freedesktop.org conventions,
6693 like the GNOME, KDE and XFCE desktop environments. Emacs only
6697 ;; If `trash-directory' is non-nil, move the file there.
6701 trash-dir)))
6702 ;; We can't trash a parent directory of trash-directory.
6705 trash-dir filename))
6708 ;; Ensure that the trashed file-name is unique.
6715 ;; If `system-move-file-to-trash' is defined, use it.
6718 ;; Otherwise, use the freedesktop.org method, as specified at
6719 ;; http://freedesktop.org/wiki/Specifications/trash-spec
6730 ;; Check if we have permissions to delete.
6734 ;; The trashed file cannot be the trash dir or its parent.
6737 trash-files-dir filename))
6740 trash-info-dir filename))
6742 ;; Ensure that the trash directory exists; otherwise, create it.
6753 ;; Try to move to trash with .trashinfo undo information
6758 ;; Perform url-encoding on FN. For compatibility with
6759 ;; other programs (e.g. XFCE Thunar), allow literal "/"
6760 ;; for path separators.
6765 ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A
6766 ?B ?C ?D ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O
6779 fn))
6784 ;; Attempt to make .trashinfo file, trying up to 5
6785 ;; times. The .trashinfo file is opened with O_EXCL,
6786 ;; as per trash-spec 0.7, even if that can be a problem
6787 ;; on old NFS versions...
6791 trash-files-dir))
6793 success info-fn)
6798 trash-info-dir))
6806 ;; Uniquify new-fn. (Some file managers do not
6807 ;; like Emacs-style backup file names---e.g. bug
6808 ;; 170956 in Konqueror bug tracker.)
6813 ;; Finally, try to move the file to the trashcan.
6817 \f
6842 ;;; files.el ends here