| blob | 7d20e1456b6b615ab5af220d99207f881bb89483 |
1 ;;; files.el --- file input and output commands for Emacs -*- lexical-binding:t -*-
3 ;; Copyright (C) 1985-1987, 1992-2014 Free Software Foundation, Inc.
5 ;; Maintainer: emacs-devel@gnu.org
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 "If non-nil, backups will be inhibited.
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 visiting a file uses its truename as the visited-file name.
163 That is, the buffer visiting the file has the truename as the
164 value of `buffer-file-name'. The truename of a file is found by
165 chasing all links both at the file level and at the levels of the
166 containing directories."
172 "Specify which files should be reverted without query.
173 The value is a list of regular expressions.
174 If the file name matches one of these regular expressions,
175 then `revert-buffer' reverts the file without querying
176 if the file has changed on disk and you have not edited the buffer."
181 "The device number and file number of the file visited in the current buffer.
182 The value is a list of the form (FILENUM DEVNUM).
183 This pair of numbers uniquely identifies the file.
197 "The directory for writing small temporary files.
198 If non-nil, this directory is used instead of `temporary-file-directory'
199 by programs that create small temporary files. This is for systems that
200 have fast storage with limited space, such as a RAM disk."
205 ;; The system null device. (Should reference NULL_DEVICE from C.)
232 "Non-nil means protect against I/O errors while saving files.
233 Some modes set this non-nil in particular buffers.
235 This feature works by writing the new contents into a temporary file
236 and then renaming the temporary file to replace the original.
237 In this way, any I/O error in writing leaves the original untouched,
238 and there is never any instant where the file is nonexistent.
240 Note that this feature forces backups to be made by copying.
241 Yet, at the same time, saving a precious file
242 breaks any hard links between it and other files.
244 This feature is advisory: for example, if the directory in which the
245 file is being saved is not writable, Emacs may ignore a non-nil value
246 of `file-precious-flag' and write directly into the file.
248 See also: `break-hardlink-on-save'."
253 "Whether to allow breaking hardlinks when saving files.
254 If non-nil, then when saving a file that exists under several
255 names \(i.e., has multiple hardlinks), break the hardlink
256 associated with `buffer-file-name' and write to a new file, so
257 that the other instances of the file are not affected by the
258 save.
260 If `buffer-file-name' refers to a symlink, do not break the symlink.
262 Unlike `file-precious-flag', `break-hardlink-on-save' is not advisory.
263 For example, if the directory in which a file is being saved is not
264 itself writable, then error instead of saving in some
265 hardlink-nonbreaking way.
267 See also `backup-by-copying' and `backup-by-copying-when-linked'."
273 "Control use of version numbers for backup files.
274 When t, make numeric backup versions unconditionally.
275 When nil, make them for files that have some already.
276 The value `never' means do not make them."
286 "When cleaning directory, number of versions to keep."
292 "If t, delete excess backup versions silently.
293 If nil, ask confirmation. Any other value prevents any trimming."
300 "Number of oldest versions to keep when a new numbered backup is made."
306 "Number of newest versions to keep when a new numbered backup is made.
307 Includes the new backup. Must be > 0"
313 "Whether to add a newline automatically at the end of the file.
315 A value of t means do this only when the file is about to be saved.
316 A value of `visit' means do this right after the file is visited.
317 A value of `visit-save' means do it at both of those times.
318 Any other non-nil value means ask user whether to add a newline, when saving.
319 A value of nil means don't add newlines.
321 Certain major modes set this locally to the value obtained
322 from `mode-require-final-newline'."
332 "Whether to add a newline at end of file, in certain major modes.
333 Those modes set `require-final-newline' to this value when you enable them.
334 They do so because they are often used for files that are supposed
335 to end in newlines, and the question is how to arrange that.
337 A value of t means do this only when the file is about to be saved.
338 A value of `visit' means do this right after the file is visited.
339 A value of `visit-save' means do it at both of those times.
340 Any other non-nil value means ask user whether to add a newline, when saving.
342 A value of nil means do not add newlines. That is a risky choice in this
343 variable since this value is used for modes for files that ought to have
344 final newlines. So if you set this to nil, you must explicitly check and
345 add a final newline, whenever you save a file that really needs one."
355 "Non-nil says by default do auto-saving of every file-visiting buffer."
361 ;; Don't put "\\2" inside expand-file-name, since it will be
362 ;; transformed to "/2" on DOS/Windows.
364 "Transforms to apply to buffer file name before making auto-save file name.
365 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
366 REGEXP is a regular expression to match against the file name.
367 If it matches, `replace-match' is used to replace the
368 matching part with REPLACEMENT.
369 If the optional element UNIQUIFY is non-nil, the auto-save file name is
370 constructed by taking the directory part of the replaced file-name,
371 concatenated with the buffer file name with all directory separators
372 changed to `!' to prevent clashes. This will not work
373 correctly if your filesystem truncates the resulting name.
375 All the transforms in the list are tried, in the order they are listed.
376 When one transform applies, its result is final;
377 no further transforms are tried.
379 The default value is set up to put the auto-save file into the
380 temporary directory (see the variable `temporary-file-directory') for
381 editing a remote file.
383 On MS-DOS filesystems without long names this variable is always
384 ignored."
392 "Non-nil means save word abbrevs too when files are saved.
393 If `silently', don't ask the user before saving."
398 "Non-nil means allow `find-file' to visit directories.
399 To visit the directory, `find-file' runs `find-directory-functions'."
404 "List of functions to try in sequence to visit a directory.
405 Each function is called with the directory name as the sole argument
406 and should return either a buffer or nil."
410 ;; FIXME: also add a hook for `(thing-at-point 'filename)'
412 "List of functions to try in sequence to get a file name at point.
413 Each function should return either nil or a file name found at the
414 location of point in the current buffer."
418 ;;;It is not useful to make this a local variable.
419 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
423 "List of functions to be called for `find-file' on nonexistent file.
424 These functions are called as soon as the error is detected.
425 Variable `buffer-file-name' is already set up.
428 ;;;It is not useful to make this a local variable.
429 ;;;(put 'find-file-hooks 'permanent-local t)
432 "List of functions to be called after a buffer is loaded from a file.
433 The buffer's local variables (if any) will have been processed before the
434 functions are called."
442 "List of functions to be called before writing out a buffer to a file.
443 If one of them returns non-nil, the file is considered already written
444 and the rest are not called.
445 These hooks are considered to pertain to the visited file.
446 So any buffer-local binding of this variable is discarded if you change
448 change the major mode.
450 This hook is not run if any of the functions in
451 `write-contents-functions' returns non-nil. Both hooks pertain
452 to how to save a buffer to file, for instance, choosing a suitable
453 coding system and setting mode bits. (See Info
454 node `(elisp)Saving Buffers'.) To perform various checks or
466 "List of functions to be called before writing out a buffer to a file.
467 If one of them returns non-nil, the file is considered already written
468 and the rest are not called and neither are the functions in
469 `write-file-functions'.
471 This variable is meant to be used for hooks that pertain to the
472 buffer's contents, not to the particular visited file; thus,
473 `set-visited-file-name' does not clear this variable; but changing the
474 major mode does clear it.
476 For hooks that _do_ pertain to the particular visited file, use
477 `write-file-functions'. Both this variable and
478 `write-file-functions' relate to how a buffer is saved to file.
479 To perform various checks or updates before the buffer is saved,
484 "Control use of local variables in files you visit.
485 The value can be t, nil, :safe, :all, or something else.
487 A value of t means file local variables specifications are obeyed
488 if all the specified variable values are safe; if any values are
489 not safe, Emacs queries you, once, whether to set them all.
490 \(When you say yes to certain values, they are remembered as safe.)
492 :safe means set the safe variables, and ignore the rest.
493 :all means set all variables, whether safe or not.
494 (Don't set it permanently to :all.)
495 A value of nil means always ignore the file local variables.
497 Any other value means always query you once whether to set them all.
498 \(When you say yes to certain values, they are remembered as safe, but
501 This variable also controls use of major modes specified in
502 a -*- line.
505 always obeys file local variable specifications and the -*- line,
506 and ignores this variable."
507 :risky t
516 "Non-nil means enable use of directory-local variables.
517 Some modes may wish to set this to nil to prevent directory-local
520 ;; This is an odd variable IMO.
521 ;; You might wonder why it is needed, when we could just do:
522 ;; (set (make-local-variable 'enable-local-variables) nil)
523 ;; These two are not precisely the same.
524 ;; Setting this variable does not cause -*- mode settings to be
525 ;; ignored, whereas setting enable-local-variables does.
526 ;; Only three places in Emacs use this variable: tar and arc modes,
527 ;; and rmail. The first two don't need it. They already use
528 ;; inhibit-local-variables-regexps, which is probably enough, and
529 ;; could also just set enable-local-variables locally to nil.
530 ;; Them setting it has the side-effect that dir-locals cannot apply to
531 ;; eg tar files (?). FIXME Is this appropriate?
532 ;; AFAICS, rmail is the only thing that needs this, and the only
533 ;; reason it uses it is for BABYL files (which are obsolete).
534 ;; These contain "-*- rmail -*-" in the first line, which rmail wants
535 ;; to respect, so that find-file on a BABYL file will switch to
536 ;; rmail-mode automatically (this is nice, but hardly essential,
537 ;; since most people are used to explicitly running a command to
538 ;; access their mail; M-x gnus etc). Rmail files may happen to
539 ;; contain Local Variables sections in messages, which Rmail wants to
540 ;; ignore. So AFAICS the only reason this variable exists is for a
541 ;; minor convenience feature for handling of an obsolete Rmail file format.
543 "Like `enable-local-variables' but meant for buffer-local bindings.
544 The meaningful values are nil and non-nil. The default is non-nil.
545 If a major mode sets this to nil, buffer-locally, then any local
546 variables list in a file visited in that mode will be ignored.
548 This variable does not affect the use of major modes specified
553 The value can be t, nil or something else.
554 A value of t means obey `eval' variables.
555 A value of nil means ignore them; anything else means query."
556 :risky t
562 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
571 "Non-nil means buffers visiting files read-only do so in view mode.
572 In fact, this means that all read-only buffers normally have
573 View mode enabled, including buffers that are read-only because
574 you visit a file you cannot alter, and buffers you make read-only
580 "History list of file names entered in the minibuffer.
582 Maximum length of the history list is determined by the value
584 \f
587 "Provides support for ange-ftp host name completion.
588 Runs the usual ange-ftp hook, but only for completion operations."
589 ;; Having this here avoids the need to load ange-ftp when it's not
590 ;; really in use.
596 inhibit-file-name-handlers)))
604 "Convert a standard file's name to something suitable for the OS.
605 This means to guarantee valid names and perhaps to canonicalize
606 certain patterns.
608 FILENAME should be an absolute file name since the conversion rules
609 sometimes vary depending on the position in the file name. E.g. c:/foo
610 is a valid DOS file name, but c:/bar/c:/foo is not.
612 This function's standard definition is trivial; it just returns
613 the argument. However, on Windows and DOS, replace invalid
614 characters. On DOS, make sure to obey the 8.3 limitations.
615 In the native Windows build, turn Cygwin names into native names,
616 and also turn slashes into backslashes if the shell requires it (see
617 `w32-shell-dos-semantics').
619 See Info node `(elisp)Standard File Names' for more details."
624 ;; Replace invalid filename characters with !
628 name))
636 "Read directory name, prompting with PROMPT and completing in directory DIR.
637 Value is not expanded---you must call `expand-file-name' yourself.
638 Default name to DEFAULT-DIRNAME if user exits with the same
639 non-empty string that was inserted by this function.
640 (If DEFAULT-DIRNAME is omitted, DIR combined with INITIAL is used,
641 or just DIR if INITIAL is nil.)
642 If the user exits with an empty minibuffer, this function returns
643 an empty string. (This can only happen if the user erased the
644 pre-inserted contents or if `insert-default-directory' is nil.)
645 Fourth arg MUSTMATCH non-nil means require existing directory's name.
646 Non-nil and non-t means also require confirmation after completion.
647 Fifth arg INITIAL specifies text to start with.
648 DIR should be an absolute directory name. It defaults to
649 the value of `default-directory'."
654 dir))
655 mustmatch initial
658 \f
660 "Show the current default directory."
665 "Value of the CDPATH environment variable, as a list.
669 "Explode a search path into a list of directory names.
670 Directories are separated by `path-separator' (which is colon in
671 GNU and Unix systems). Substitute environment variables into the
672 resulting list of directory names. For an empty path element (i.e.,
673 a leading or trailing separator, or two adjacent separators), return
674 nil (meaning `default-directory') as the associated list element."
682 "Change current directory to given absolute file name DIR."
683 ;; Put the name into directory syntax now,
684 ;; because otherwise expand-file-name may give some bad results.
686 ;; We used to additionally call abbreviate-file-name here, for an
687 ;; unknown reason. Problem is that most buffers are setup
688 ;; without going through cd-absolute and don't call
689 ;; abbreviate-file-name on their default-directory, so the few that
690 ;; do end up using a superficially different directory.
702 "Make DIR become the current buffer's default directory.
703 If your environment includes a `CDPATH' variable, try each one of
704 that list of directories (separated by occurrences of
705 `path-separator') when resolving a relative directory name.
706 The path separator is colon in GNU and GNU-like systems."
709 ;; FIXME: There's a subtle bug in the completion below. Seems linked
710 ;; to a fundamental difficulty of implementing `predicate' correctly.
711 ;; The manifestation is that TAB may list non-directories in the case where
712 ;; those files also correspond to valid directories (if your cd-path is (A/
713 ;; B/) and you have A/a a file and B/a a directory, then both `a' and `a/'
714 ;; will be listed as valid completions).
715 ;; This is because `a' (listed because of A/a) is indeed a valid choice
716 ;; (which will lead to the use of B/a).
721 cd-path nil))
730 default-directory default-directory
731 t))))
741 "Load the Lisp file named FILE."
742 ;; This is a case where .elc makes a lot of sense.
749 "Search for FILENAME through PATH.
750 If found, return the absolute file name of FILENAME; otherwise
751 return nil.
752 PATH should be a list of directories to look in, like the lists in
753 `exec-path' or `load-path'.
754 If SUFFIXES is non-nil, it should be a list of suffixes to append to
757 If non-nil, PREDICATE is used instead of `file-readable-p'.
759 This function will normally skip directories, so if you want it to find
760 directories, make sure the PREDICATE function returns `dir-ok' for them.
762 PREDICATE can also be an integer to pass to the `access' system call,
763 in which case file-name handlers are ignored. This usage is deprecated.
764 For compatibility, PREDICATE can also be one of the symbols
765 `executable', `readable', `writable', or `exists', or a list of
766 one or more of those symbols."
777 "Do completion for file names passed to `locate-file'."
780 ;; FIXME: maybe we should use completion-file-name-table instead,
781 ;; tho at least for `load', the arg is passed through
782 ;; substitute-in-file-name for historical reasons.
792 ;; If we have files like "foo.el" and "foo.elc", we could load one of
793 ;; them with "foo.el", "foo.elc", or "foo", where just "foo" is the
794 ;; preferred way. So if we list all 3, that gives a lot of redundant
795 ;; entries for the poor soul looking just for "foo". OTOH, sometimes
796 ;; the user does want to pay attention to the extension. We try to
797 ;; diffuse this tension by stripping the suffix, except when the
798 ;; result is a single element (i.e. usually we only list "foo" unless
799 ;; it's the only remaining element in the list, in which case we do
800 ;; list "foo", "foo.elc" and "foo.el").
811 string-file dir))
816 ;; Switching from names to names+fullnames creates a non-monotonicity
817 ;; which can cause problems with things like partial-completion.
818 ;; To minimize the problem, filter out completion-regexp-list, so that
819 ;; M-x load-library RET t/x.e TAB finds some files. Also remove elements
820 ;; from `names' which only matched `string' when they still had
821 ;; their suffix.
823 ;; Remove duplicates of the first element, so that we can easily check
824 ;; if `names' really only contains a single element.
827 ;; There's no more than one matching non-suffixed element, so expand
828 ;; the list by adding the suffixed elements as well.
831 string-dir names string-file pred action)))))
834 "Do completion for file names passed to `locate-file'.
835 PATH-AND-SUFFIXES is a pair of lists, (DIRECTORIES . SUFFIXES)."
839 string nil action))
843 "Regexp of directory names which stop the search in `locate-dominating-file'.
844 Any directory whose name matches this regexp will be treated like
845 a kind of root directory by `locate-dominating-file' which will stop its search
846 when it bumps into it.
847 The default regexp prevents fruitless and time-consuming attempts to find
848 special files in directories in which filenames are interpreted as hostnames,
851 ;; (defun locate-dominating-files (file regexp)
852 ;; "Look up the directory hierarchy from FILE for a file matching REGEXP.
853 ;; Stop at the first parent where a matching file is found and return the list
854 ;; of files that that match in this directory."
855 ;; (catch 'found
856 ;; ;; `user' is not initialized yet because `file' may not exist, so we may
857 ;; ;; have to walk up part of the hierarchy before we find the "initial UID".
858 ;; (let ((user nil)
859 ;; ;; Abbreviate, so as to stop when we cross ~/.
860 ;; (dir (abbreviate-file-name (file-name-as-directory file)))
861 ;; files)
862 ;; (while (and dir
863 ;; ;; As a heuristic, we stop looking up the hierarchy of
864 ;; ;; directories as soon as we find a directory belonging to
865 ;; ;; another user. This should save us from looking in
866 ;; ;; things like /net and /afs. This assumes that all the
867 ;; ;; files inside a project belong to the same user.
868 ;; (let ((prev-user user))
869 ;; (setq user (nth 2 (file-attributes dir)))
870 ;; (or (null prev-user) (equal user prev-user))))
871 ;; (if (setq files (condition-case nil
872 ;; (directory-files dir 'full regexp 'nosort)
873 ;; (error nil)))
874 ;; (throw 'found files)
875 ;; (if (equal dir
876 ;; (setq dir (file-name-directory
877 ;; (directory-file-name dir))))
878 ;; (setq dir nil))))
879 ;; nil)))
882 "Look up the directory hierarchy from FILE for a directory containing NAME.
883 Stop at the first parent directory containing a file NAME,
884 and return the directory. Return nil if not found.
885 Instead of a string, NAME can also be a predicate taking one argument
886 \(a directory) and returning a non-nil value if that directory is the one for
887 which we're looking."
888 ;; We used to use the above locate-dominating-files code, but the
889 ;; directory-files call is very costly, so we're much better off doing
890 ;; multiple calls using the code in here.
891 ;;
892 ;; Represent /home/luser/foo as ~/foo so that we don't try to look for
893 ;; `name' in /home or in /.
896 ;; `user' is not initialized outside the loop because
897 ;; `file' may not exist, so we may have to walk up part of the
898 ;; hierarchy before we find the "initial UID". Note: currently unused
899 ;; (user nil)
900 try)
903 ;; FIXME: Disabled this heuristic because it is sometimes
904 ;; inappropriate.
905 ;; As a heuristic, we stop looking up the hierarchy of
906 ;; directories as soon as we find a directory belonging
907 ;; to another user. This should save us from looking in
908 ;; things like /net and /afs. This assumes that all the
909 ;; files inside a project belong to the same user.
910 ;; (let ((prev-user user))
911 ;; (setq user (nth 2 (file-attributes file)))
912 ;; (and prev-user (not (equal user prev-user))))
924 "Non-nil means warn if cannot access `user-emacs-directory'.
925 Set this to nil at your own risk..."
931 "Return an absolute per-user Emacs-specific file name.
932 If NEW-NAME exists in `user-emacs-directory', return it.
933 Else if OLD-NAME is non-nil and ~/OLD-NAME exists, return ~/OLD-NAME.
934 Else return NEW-NAME in `user-emacs-directory', creating the
935 directory if it does not exist."
943 at-home
944 ;; Make sure `user-emacs-directory' exists,
945 ;; unless we're in batch mode or dumping Emacs.
947 purify-flag
961 user-emacs-directory-warning
963 ;; Only warn once per Emacs session.
967 Unable to %s `user-emacs-directory' (%s).
968 Any data that would normally be written there may be lost!
969 If you never want to see this message again,
970 customize the variable `user-emacs-directory-warning'."
971 errtype user-emacs-directory)))))
972 bestname))))
976 "Search for COMMAND in `exec-path' and return the absolute file name.
977 Return nil if COMMAND is not found anywhere in `exec-path'."
978 ;; Use 1 rather than file-executable-p to better match the behavior of
979 ;; call-process.
983 "Load the Emacs Lisp library named LIBRARY.
984 This is an interface to the function `load'. LIBRARY is searched
985 for in `load-path', both with and without `load-suffixes' (as
986 well as `load-file-rep-suffixes').
988 See Info node `(emacs)Lisp Libraries' for more details.
989 See `load-file' for a different interface to `load'."
993 load-path
998 "Test whether FILE specifies a location on a remote system.
999 A file is considered remote if accessing it is likely to
1000 be slower or less reliable than accessing local files.
1002 `file-remote-p' never opens a new remote connection. It can
1003 only reuse a connection that is already open.
1005 Return nil or a string identifying the remote connection
1006 \(ideally a prefix of FILE). Return nil if FILE is a relative
1007 file name.
1009 When IDENTIFICATION is nil, the returned string is a complete
1010 remote identifier: with components method, user, and host. The
1011 components are those present in FILE, with defaults filled in for
1012 any that are missing.
1014 IDENTIFICATION can specify which part of the identification to
1015 return. IDENTIFICATION can be the symbol `method', `user',
1016 `host', or `localname'. Any other value is handled like nil and
1017 means to return the complete identification. The string returned
1018 for IDENTIFICATION `localname' can differ depending on whether
1019 there is an existing connection.
1021 If CONNECTED is non-nil, return an identification only if FILE is
1022 located on a remote system and a connection is established to
1023 that remote system.
1025 Tip: You can use this expansion of remote identifier components
1026 to derive a new remote file name from an existing one. For
1032 same remote identifier as FILE but expanded; a name such as
1037 nil)))
1039 ;; Probably this entire variable should be obsolete now, in favor of
1040 ;; something Tramp-related (?). It is not used in many places.
1041 ;; It's not clear what the best file for this to be in is, but given
1042 ;; it uses custom-initialize-delay, it is easier if it is preloaded
1043 ;; rather than autoloaded.
1045 ;; This used to try various hard-coded places for remsh, rsh, and
1046 ;; rcmd, trying to guess based on location whether "rsh" was
1047 ;; "restricted shell" or "remote shell", but I don't see the point
1048 ;; in this day and age. Almost everyone will use ssh, and have
1049 ;; whatever command they want to use in PATH.
1056 "Program to use to execute commands on a remote host (e.g. ssh or rsh)."
1063 "Whether to use the remote file-name cache for read access.
1064 When `nil', never expire cached values (caution)
1065 When `t', never use the cache (safe, but may be slow)
1066 A number means use cached values for that amount of seconds since caching.
1068 The attributes of remote files are cached for better performance.
1069 If they are changed outside of Emacs's control, the cached values
1070 become invalid, and must be reread. If you are sure that nothing
1071 other than Emacs changes the files, you can set this variable to `nil'.
1073 If a remote file is checked regularly, it might be a good idea to
1074 let-bind this variable to a value less than the interval between
1075 consecutive checks. For example:
1077 (defun display-time-file-nonempty-p (file)
1078 (let ((remote-file-name-inhibit-cache (- display-time-interval 5)))
1079 (and (file-exists-p file)
1080 (< 0 (nth 7 (file-attributes (file-chase-links file)))))))"
1091 "Copy the file FILE into a temporary file on this machine.
1092 Returns the name of the local copy, or nil, if FILE is directly
1093 accessible."
1094 ;; This formerly had an optional BUFFER argument that wasn't used by
1095 ;; anything.
1099 nil)))
1102 "Return the truename of FILENAME.
1103 If FILENAME is not absolute, first expands it against `default-directory'.
1104 The truename of a file name is found by chasing symbolic links
1105 both at the level of the file and at the level of the directories
1106 containing it, until no links are left at any level.
1109 ;; COUNTER and PREV-DIRS are only used in recursive calls.
1110 ;; COUNTER can be a cons cell whose car is the count of how many
1111 ;; more links to chase before getting an error.
1112 ;; PREV-DIRS can be a cons cell whose car is an alist
1113 ;; of truenames we've just recently computed.
1127 ;; For speed, remove the ange-ftp completion handler from the list.
1128 ;; We know it's not needed here.
1129 ;; For even more speed, do this only on the outermost call.
1136 ;; andrewi@harlequin.co.uk - on Windows, there is an issue with
1137 ;; case differences being ignored by the OS, and short "8.3 DOS"
1138 ;; name aliases existing for all files. (The short names are not
1139 ;; reported by directory-files, but can be used to refer to files.)
1140 ;; It seems appropriate for file-truename to resolve these issues in
1141 ;; the most natural way, which on Windows is to call the function
1142 ;; `w32-long-file-name' - this returns the exact name of a file as
1143 ;; it is stored on disk (expanding short name aliases with the full
1144 ;; name in the process).
1147 ;; If filename exists, use its long name. If it doesn't
1148 ;; exist, the recursion below on the directory of filename
1149 ;; will drill down until we find a directory that exists,
1150 ;; and use the long name of that, with the extra
1151 ;; non-existent path components concatenated.
1156 ;; If this file directly leads to a link, process that iteratively
1157 ;; so that we don't use lots of stack.
1163 ;; For file name that has a special handler, call handler.
1164 ;; This is so that ange-ftp can save time by doing a no-op.
1167 done t)
1169 target dirfile)
1170 ;; Get the truename of the directory.
1172 ;; If these are equal, we have the (or a) root directory.
1176 ;; If this is the same dir we last got the truename for,
1177 ;; save time--don't recalculate.
1187 done t)
1190 done t)
1191 ;; Put it back on the file name.
1193 ;; Is the file name the name of a link?
1196 ;; Yes => chase that link, then start all over
1197 ;; since the link may point to a directory name that uses links.
1198 ;; We can't safely use expand-file-name here
1199 ;; since target might look like foo/../bar where foo
1200 ;; is itself a link. Instead, we handle . and .. above.
1203 target
1205 done nil)
1206 ;; No, we are done!
1208 filename))
1211 "Chase links in FILENAME until a name that is not a link.
1212 Unlike `file-truename', this does not check whether a parent
1213 directory name is a symbolic link.
1214 If the optional argument LIMIT is a number,
1215 it means chase no more than that many links and then stop."
1223 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
1226 ;; Handle `..' by hand, since it needs to work in the
1227 ;; target of any directory symlink.
1228 ;; This code is not quite complete; it does not handle
1229 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
1233 ;; Chase links in the default dir of the symlink.
1237 ;; Now find the parent of that dir.
1241 newname))
1243 ;; A handy function to display file sizes in human-readable form.
1244 ;; See http://en.wikipedia.org/wiki/Kibibyte for the reference.
1246 "Produce a string showing FILE-SIZE in human-readable form.
1248 Optional second argument FLAVOR controls the units and the display format:
1250 If FLAVOR is nil or omitted, each kilobyte is 1024 bytes and the produced
1252 If FLAVOR is `si', each kilobyte is 1000 bytes and the produced suffixes
1254 If FLAVOR is `iec', each kilobyte is 1024 bytes and the produced suffixes
1257 1024.0
1260 ;; none, kilo, mega, giga, tera, peta, exa, zetta, yotta
1266 "%.1f%s%s"
1268 file-size
1270 "K"
1275 "Create a temporary file.
1276 The returned file name (created by appending some random characters at the end
1277 of PREFIX, and expanding against `temporary-file-directory' if necessary),
1278 is guaranteed to point to a newly created empty file.
1279 You can then use `write-region' to write new data into the file.
1281 If DIR-FLAG is non-nil, create a new empty directory instead of a file.
1283 If SUFFIX is non-nil, add that at the end of the file name."
1285 file)
1288 ;; Create temp files with strict access rights. It's easy to
1289 ;; loosen them later, whereas it's impossible to close the
1290 ;; time-window of loose permissions otherwise.
1298 temporary-file-directory)
1300 temporary-file-directory))))
1306 nil)
1308 ;; the file was somehow created by someone else between
1309 ;; `make-temp-name' and `write-region', let's try again.
1310 nil)
1311 file)
1312 ;; Reset the umask.
1316 "Change the encoding of FILE's name from CODING to NEW-CODING.
1317 The value is a new name of FILE.
1318 Signals a `file-already-exists' error if a file of the new name
1319 already exists unless optional fourth argument OK-IF-ALREADY-EXISTS
1320 is non-nil. A number as fourth arg means request confirmation if
1321 the new name already exists. This is what happens in interactive
1322 use with M-x."
1325 default-file-name-coding-system))
1327 from-coding to-coding)
1329 ;; We provide the default coding only when it seems that
1330 ;; the filename is correctly decoded by the default
1331 ;; coding.
1337 filename default-coding)
1338 default-coding))
1342 ;; We provide the default coding only when a user is going to
1343 ;; change the encoding not from the default coding.
1347 filename from-coding)))
1350 filename from-coding default-coding)
1351 default-coding)))
1355 default-file-name-coding-system))
1356 ;; FILE should have been decoded by DEFAULT-CODING.
1360 ;; Suppress further encoding.
1365 newname))
1366 \f
1368 "Whether confirmation is requested before visiting a new file or buffer.
1369 If nil, confirmation is not requested.
1370 If the value is `after-completion', confirmation is only
1371 requested if the user called `minibuffer-complete' right before
1372 `minibuffer-complete-and-exit'.
1373 Any other non-nil value means to request confirmation.
1375 This affects commands like `switch-to-buffer' and `find-file'."
1383 "Whether to request confirmation before visiting a new file or buffer.
1384 The variable `confirm-nonexistent-file-or-buffer' determines the
1385 return value, which may be passed as the REQUIRE-MATCH arg to
1386 `read-buffer' or `find-file-read-args'."
1394 "Temporarily add FUN to `minibuffer-setup-hook' while executing BODY.
1395 BODY should use the minibuffer at most once.
1396 Recursive uses of the minibuffer are unaffected (FUN is not
1397 called additional times).
1399 This macro actually adds an auxiliary function that calls FUN,
1400 rather than FUN itself, to `minibuffer-setup-hook'."
1406 ;; Clear out this hook so it does not interfere
1407 ;; with any recursive minibuffer usage.
1418 t))
1421 "Edit file FILENAME.
1422 Switch to a buffer visiting file FILENAME,
1423 creating one if none already exists.
1424 Interactively, the default if you just type RET is the current directory,
1425 but the visited file name is available through the minibuffer history:
1426 type M-n to pull it into the minibuffer.
1428 You can visit files on remote machines by specifying something
1429 like /ssh:SOME_REMOTE_MACHINE:FILE for the file name. You can
1430 also visit local files as a different user by specifying
1431 /sudo::FILE for the file name.
1432 See the Info node `(tramp)Filename Syntax' in the Tramp Info
1433 manual, for more about this.
1435 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1436 expand wildcards (if any) and visit multiple files. You can
1437 suppress wildcard expansion by setting `find-file-wildcards' to nil.
1439 To visit a file without any kind of conversion and without
1450 "Edit file FILENAME, in another window.
1453 an existing one. See the function `display-buffer'.
1455 Interactively, the default if you just type RET is the current directory,
1456 but the visited file name is available through the minibuffer history:
1457 type M-n to pull it into the minibuffer.
1459 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1460 expand wildcards (if any) and visit multiple files."
1473 "Edit file FILENAME, in another frame.
1476 an existing one. See the function `display-buffer'.
1478 Interactively, the default if you just type RET is the current directory,
1479 but the visited file name is available through the minibuffer history:
1480 type M-n to pull it into the minibuffer.
1482 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1483 expand wildcards (if any) and visit multiple files."
1496 "Edit the existing file FILENAME.
1498 file names with wildcards."
1515 value))
1518 "Edit file FILENAME but don't allow changes.
1527 "Edit file FILENAME in another window but don't allow changes.
1536 "Edit file FILENAME in another frame but don't allow changes.
1545 "Find file FILENAME as a replacement for the file in the next window.
1546 This command does not select that window.
1550 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1551 expand wildcards (if any) and replace the file with multiple files."
1562 "Find alternate file: " file-dir nil
1564 t))))
1571 ;; Defined and used in buffer.c, but not as a DEFVAR_LISP.
1573 "Hook run when a buffer is killed.
1574 The buffer being killed is current while the hook is running.
1575 See `kill-buffer'.
1577 Note: Be careful with let-binding this hook considering it is
1581 "Find file FILENAME, select its buffer, kill previous buffer.
1582 If the current buffer now contains an empty file that you just visited
1583 \(presumably by mistake), use this command to visit the file you really want.
1587 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
1588 expand wildcards (if any) and replace the file with multiple files.
1590 If the current buffer is an indirect buffer, or the base buffer
1591 for one or more indirect buffers, the other buffer(s) are not
1592 killed."
1601 "Find alternate file: " file-dir nil
1603 t)))
1615 ;; Run `kill-buffer-hook' here. It needs to happen before
1616 ;; variables like `buffer-file-name' etc are set to nil below,
1617 ;; because some of the hooks that could be invoked
1618 ;; (e.g., `save-place-to-alist') depend on those variables.
1619 ;;
1620 ;; Note that `kill-buffer-hook' is not what queries whether to
1621 ;; save a modified buffer visiting a file. Rather, `kill-buffer'
1622 ;; asks that itself. Thus, there's no need to temporarily do
1623 ;; `(set-buffer-modified-p nil)' before running this hook.
1625 ;; Okay, now we can end-of-life the old buffer.
1632 ;; This prevents us from finding the same buffer
1633 ;; if we specified the same file again.
1637 ;; Likewise for dired buffers.
1641 ;; This executes if find-file gets an error
1642 ;; and does not really find anything.
1643 ;; We put things back as they were.
1644 ;; If find-file actually finds something, we kill obuf below.
1653 ;; We already ran these; don't run them again.
1656 \f
1658 "Create a suitably named buffer for visiting FILENAME, and return it.
1659 FILENAME (sans directory) is used unchanged if that name is free;
1660 otherwise a string <2> or <3> or ... is appended to get an unused name.
1662 Emacs treats buffers whose names begin with a space as internal buffers.
1663 To avoid confusion when visiting a file whose name begins with a space,
1670 lastname))))
1673 "Create and return a buffer with a name based on NAME.
1674 Choose the buffer's name using `generate-new-buffer-name'."
1678 "Regexp to match the automounter prefix in a directory name."
1687 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1689 home directory is a root directory) and removes automounter prefixes
1690 \(see the variable `automount-dir-prefix')."
1691 ;; Get rid of the prefixes added by the automounter.
1698 ;; Avoid treating /home/foo as /home/Foo during `~' substitution.
1699 ;; To fix this right, we need a `file-name-case-sensitive-p'
1700 ;; function, but we don't have that yet, so just guess.
1703 ;; If any elt of directory-abbrev-alist matches this name,
1704 ;; abbreviate accordingly.
1710 ;; Compute and save the abbreviated homedir name.
1711 ;; We defer computing this until the first time it's needed, to
1712 ;; give time for directory-abbrev-alist to be set properly.
1713 ;; We include a slash at the end, to avoid spurious matches
1714 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1721 ;; If FILENAME starts with the abbreviated homedir,
1722 ;; make it start with `~' instead.
1724 ;; If the home dir is just /, don't change it.
1727 ;; MS-DOS root directories can come with a drive letter;
1728 ;; Novell Netware allows drive letters beyond `Z:'.
1736 filename)))
1739 "Return the buffer visiting file FILENAME (a string).
1740 This is like `get-file-buffer', except that it checks for any buffer
1741 visiting the same file, possibly under a different name.
1742 If PREDICATE is non-nil, only buffers satisfying it are eligible,
1743 and others are ignored.
1744 If there is no such live buffer, return nil."
1757 found)
1767 ;; Verify this buffer's file number
1768 ;; still belongs to its file.
1771 attributes)
1775 found))))
1776 \f
1778 "Non-nil means file-visiting commands should handle wildcards.
1779 For example, if you specify `*.c', that would visit all the files
1780 whose names match the pattern."
1786 "Non-nil means suppress warning messages for symlinked files.
1787 When nil, Emacs prints a warning when visiting a file that is already
1788 visited, but with a different name. Setting this option to t
1789 suppresses this warning."
1795 "Maximum size of file above which a confirmation is requested.
1796 When nil, never request confirmation."
1803 "If file SIZE larger than `large-file-warning-threshold', allow user to abort.
1804 OP-TYPE specifies the file operation being performed (for message to user)."
1813 "Read file FILENAME into a buffer and return the buffer.
1814 If a buffer exists visiting FILENAME, return that one, but
1815 verify that the file has not changed since visited or saved.
1816 The buffer is not selected, just returned to the caller.
1817 Optional second arg NOWARN non-nil means suppress any warning messages.
1818 Optional third arg RAWFILE non-nil means the file is read literally.
1819 Optional fourth arg WILDCARDS non-nil means do wildcard processing
1820 and visit all the matching files. When wildcards are actually
1821 used and expanded, return a list of buffers that are visiting
1822 the various files."
1829 'find-directory-functions
1832 filename)))
1835 find-file-wildcards
1849 ;; Find any buffer for a file which has same truename.
1851 ;; Let user know if there is a buffer with the same truename.
1855 find-file-suppress-same-file-warnings
1859 ;; Optionally also find that buffer.
1862 ;; Check to see if the file looks uncommonly large.
1866 ;; We are using an existing buffer.
1873 ;; Certain files should be reverted automatically
1874 ;; if they have changed on disk and not in the buffer.
1882 found))
1892 "File %s changed on disk. Discard your edits? "
1897 "File %s changed on disk. Discard your edits in %s? "
1905 ;; Check if a formerly read-only file has become
1906 ;; writable and vice versa, but if the buffer agrees
1907 ;; with the new state of the file, that is ok too.
1917 buffer-file-name
1918 new-status new-status)))
1924 nonexistent
1925 ;; It is confusing to ask whether to visit
1926 ;; non-literally if they have the file in
1927 ;; hexl-mode or image-mode.
1933 "The file %s is already visited normally,
1934 and you have edited the buffer. Now you have asked to visit it literally,
1935 meaning no coding system handling, format conversion, or local variables.
1936 Emacs can only visit a file in one way at a time.
1938 Do you want to save the file, and visit it literally instead? "
1939 "The file %s is already visited literally,
1940 meaning no coding system handling, format conversion, or local variables.
1941 You have edited the buffer. Now you have asked to visit the file normally,
1942 but Emacs can only visit a file in one way at a time.
1949 rawfile truename number))
1953 "\
1954 Do you want to discard your changes, and visit the file literally now? "
1955 "\
1958 rawfile truename number)
1964 "The file %s is already visited normally.
1965 You have asked to visit it literally,
1966 meaning no coding system decoding, format conversion, or local variables.
1967 But Emacs can only visit a file in one way at a time.
1969 Do you want to revisit the file literally now? "
1970 "The file %s is already visited literally,
1971 meaning no coding system decoding, format conversion, or local variables.
1972 You have asked to visit it normally,
1973 but Emacs can only visit a file in one way at a time.
1978 rawfile truename number)
1981 ;; Return the buffer we are using.
1982 buf)
1983 ;; Create a new buffer.
1985 ;; find-file-noselect-1 may use a different buffer.
1987 rawfile truename number))))))
1993 ;; Needed in case we are re-visiting the file with a different
1994 ;; text representation.
2011 filename)))
2012 ;; Unconditionally set error
2022 filename)))
2023 ;; Run find-file-not-found-functions until one returns non-nil.
2025 ;; If they fail too, set error.
2027 ;; Record the file's truename, and maybe use that as visited name.
2035 ;; Set buffer's default directory to that of the file.
2037 ;; Turn off backup files for certain file names. Since
2038 ;; this is a permanent local, the major mode won't eliminate it.
2052 \f
2054 "Like `insert-file-contents', but only reads in the file literally.
2055 A buffer may be modified in several ways after reading into the buffer,
2056 to Emacs features such as format decoding, character code
2057 conversion, `find-file-hook', automatic uncompression, etc.
2059 This function ensures that none of these modifications will take place."
2065 ;; FIXME: Yuck!! We should turn insert-file-contents-literally
2066 ;; into a file operation instead!
2068 inhibit-file-name-handlers))
2075 filename)))
2076 ;; Check whether the file is uncommonly large
2087 "Insert contents of file FILENAME into buffer after point with no conversion.
2089 This function is meant for the user to run interactively.
2090 Don't call it from programs! Use `insert-file-contents-literally' instead.
2091 \(Its calling sequence is different; see its documentation)."
2097 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
2098 This has the `permanent-local' property, which takes effect if you
2103 "Visit file FILENAME with no conversion of any kind.
2104 Format conversion and character code conversion are both disabled,
2105 and multibyte characters are disabled in the resulting buffer.
2106 The major mode used is Fundamental mode regardless of the file name,
2107 and local variable specifications in the file are ignored.
2108 Automatic uncompression and adding a newline at the end of the
2109 file due to `require-final-newline' is also disabled.
2111 You cannot absolutely rely on this function to result in
2112 visiting the file literally. If Emacs already has a buffer
2113 which is visiting the file, you get the existing buffer,
2114 regardless of whether it was created literally or not.
2116 In a Lisp program, if you want to be sure of accessing a file's
2117 contents literally, you should create a temporary buffer and then read
2118 the file contents into it using `insert-file-contents-literally'."
2121 "Find file literally: " nil default-directory
2124 \f
2126 _after-find-file-from-revert-buffer
2127 nomodes)
2128 "Called after finding a file and by the default revert function.
2129 Sets buffer mode, parses local variables.
2130 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
2131 error in reading the file. WARN non-nil means warn if there
2132 exists an auto-save file more recent than the visited file.
2133 NOAUTO means don't mess with auto-save mode.
2134 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER is ignored
2135 \(see `revert-buffer-in-progress-p' for similar functionality).
2136 Fifth arg NOMODES non-nil means don't alter the file's modes.
2137 Finishes by calling the functions in `find-file-hook'
2138 unless NOMODES is non-nil."
2141 nil
2151 "Symbolic link that points to nonexistent file"
2155 ;; No need to warn if buffer is auto-saved
2156 ;; under the name of the visited file.
2158 auto-save-visited-file-name))
2161 buffer-file-name))
2181 ;; Make people do a little extra work (C-x C-q)
2182 ;; before altering a backup file.
2185 ;; When a file is marked read-only,
2186 ;; make the buffer read-only even if root is looking at it.
2194 ;; If requested, add a newline at the end of the file.
2205 view-read-only
2211 "Eval BODY and turn any error into a FORMAT message.
2212 FORMAT can have a %s escape which will be replaced with the actual error.
2213 If `debug-on-error' is set, errors are not caught, so that you can
2214 debug them.
2215 Avoid using a large BODY since it is duplicated."
2224 "Choose the major mode for this buffer automatically.
2225 Also sets up any specified local variables of the file.
2226 Uses the visited file name, the -*- line, and the local variables spec.
2228 This function is called automatically from `find-file'. In that case,
2229 we may set up the file-specified mode and local variables,
2230 depending on the value of `enable-local-variables'.
2231 In addition, if `local-enable-local-variables' is nil, we do
2232 not set local variables (though we do notice a mode specified with -*-.)
2234 `enable-local-variables' is ignored if you run `normal-mode' interactively,
2235 or from Lisp without specifying the optional argument FIND-FILE;
2236 in that case, this function acts as if `enable-local-variables' were t."
2240 ;; FIXME this is less efficient than it could be, since both
2241 ;; s-a-m and h-l-v may parse the same regions, looking for "mode:".
2246 ;; Turn font lock off and on, to make sure it takes account of
2247 ;; whatever file local variables are relevant to it.
2249 ;; Font-lock-mode (now in font-core.el) can be ON when
2250 ;; font-lock.el still hasn't been loaded.
2257 "Non-nil means to try second pass through `auto-mode-alist'.
2258 This means that if the first case-sensitive search through the alist fails
2259 to find a matching major mode, a second case-insensitive search is made.
2260 On systems with case-insensitive file names, this variable is ignored,
2261 since only a single case-insensitive search through the alist is made."
2267 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
2268 ;; c++-mode, java-mode and more) are added through autoload
2269 ;; directives in that file. That way is discouraged since it
2270 ;; spreads out the definition of the initial value.
2316 ;; Less common extensions come here
2317 ;; so more common ones above are found faster.
2325 ;; Besides .gdbinit, gdb documents other names to be usable for init
2326 ;; files, cross-debuggers can use something like
2327 ;; .PROCESSORNAME-gdbinit so that the host and target gdbinit files
2328 ;; don't interfere with each other.
2330 ;; GDB 7.5 introduced OBJFILE-gdb.gdb script files; e.g. a file
2331 ;; named 'emacs-gdb.gdb', if it exists, will be automatically
2332 ;; loaded when GDB reads an objfile called 'emacs'.
2340 ("\\(/\\|\\`\\)\\.\\(bash_\\(profile\\|history\\|log\\(in\\|out\\)\\)\\|z?log\\(in\\|out\\)\\)\\'" . sh-mode)
2364 ;; The Fortran standard does not say anything about file extensions.
2365 ;; .f90 was widely used for F90, now we seem to be trapped into
2366 ;; using a different extension for each language revision.
2367 ;; Anyway, the following extensions are supported by gfortran.
2375 ;; The list of archive file extensions should be in sync with
2376 ;; `auto-coding-alist' with `no-conversion' coding system.
2382 ;; Mailer puts message to be edited in
2383 ;; /tmp/Re.... or Message
2386 ;; some news reader is reported to use this
2399 ;; .emacs or .gnus or .viper following a directory delimiter in
2400 ;; Unix, MSDOG or VMS syntax.
2403 ;; _emacs following a directory delimiter
2404 ;; in MsDos syntax
2408 ;; Linux-2.6.9 uses some different suffix for linker scripts:
2409 ;; "ld", "lds", "lds.S", "lds.in", "ld.script", and "ld.script.balo".
2410 ;; eCos uses "ld" and "ldi". Netbsd uses "ldscript.*".
2413 ;; .xs is also used for ld scripts, but seems to be more commonly
2414 ;; associated with Perl .xs files (C with Perl bindings). (Bug#7071)
2416 ;; Explained in binutils ld/genscripts.sh. Eg:
2417 ;; A .x script file is the default script.
2418 ;; A .xr script is for linking without relocation (-r flag). Etc.
2422 ;; Common Lisp ASDF package system.
2429 ("\\.\\(?:PDF\\|DVI\\|OD[FGPST]\\|DOCX?\\|XLSX?\\|PPTX?\\|pdf\\|djvu\\|dvi\\|od[fgpst]\\|docx?\\|xlsx?\\|pptx?\\)\\'" . doc-view-mode-maybe)
2441 ;; Windows candidates may be opened case sensitively on Unix
2447 ("\\`/etc/\\(?:DIR_COLORS\\|ethers\\|.?fstab\\|.*hosts\\|lesskey\\|login\\.?de\\(?:fs\\|vperm\\)\\|magic\\|mtab\\|pam\\.d/.*\\|permissions\\(?:\\.d/.+\\)?\\|protocols\\|rpc\\|services\\)\\'" . conf-space-mode)
2448 ("\\`/etc/\\(?:acpid?/.+\\|aliases\\(?:\\.d/.+\\)?\\|default/.+\\|group-?\\|hosts\\..+\\|inittab\\|ksysguarddrc\\|opera6rc\\|passwd-?\\|shadow-?\\|sysconfig/.+\\)\\'" . conf-mode)
2449 ;; ChangeLog.old etc. Other change-log-mode entries are above;
2450 ;; this has lower priority to avoid matching changelog.sgml etc.
2452 ;; either user's dot-files or under /etc or some such
2454 ;; alas not all ~/.*rc files are like this
2455 ("/\\.\\(?:enigma\\|gltron\\|gtk\\|hxplayer\\|net\\|neverball\\|qt/.+\\|realplayer\\|scummvm\\|sversion\\|sylpheed/.+\\|xmp\\)rc\\'" . conf-mode)
2460 ;; this contains everything twice, with space and with colon :-(
2462 ;; Get rid of any trailing .n.m and try again.
2463 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
2464 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
2465 ;; Using mode nil rather than `ignore' would let the search continue
2466 ;; through this list (with the shortened name) rather than start over.
2469 ;; This should come after "in" stripping (e.g. config.h.in).
2470 ;; *.cf, *.cfg, *.conf, *.config[.local|.de_DE.UTF8|...], */config
2472 ;; The following should come after the ChangeLog pattern
2473 ;; for the sake of ChangeLog.1, etc.
2474 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
2476 "Alist of filename patterns vs corresponding major mode functions.
2477 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
2478 \(NON-NIL stands for anything that is not nil; the value does not matter.)
2479 Visiting a file whose name matches REGEXP specifies FUNCTION as the
2480 mode function to use. FUNCTION will be called, unless it is nil.
2482 If the element has the form (REGEXP FUNCTION NON-NIL), then after
2483 calling FUNCTION (if it's not nil), we delete the suffix that matched
2484 REGEXP and search the list again for another match.
2486 The extensions whose FUNCTION is `archive-mode' should also
2487 appear in `auto-coding-alist' with `no-conversion' coding system.
2489 See also `interpreter-mode-alist', which detects executable script modes
2490 based on the interpreters they specify to run,
2495 "Select Conf mode or XML mode according to start of file."
2505 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
2506 ;; and pike-mode) are added through autoload directives in that
2507 ;; file. That way is discouraged since it spreads out the
2508 ;; definition of the initial value.
2535 "Alist mapping interpreter names to major modes.
2536 This is used for files whose first lines match `auto-mode-interpreter-regexp'.
2537 Each element looks like (REGEXP . MODE).
2539 the interpreter specified in the first line of a script, enable
2540 major mode MODE.
2547 ;; TODO really this should be a list of modes (eg tar-mode), not regexps,
2548 ;; because we are duplicating info from auto-mode-alist.
2549 ;; TODO many elements of this list are also in auto-coding-alist.
2558 "List of regexps matching file names in which to ignore local variables.
2560 Files matching this list are typically binary file formats.
2561 They may happen to contain sequences that look like local variable
2562 specifications, but are not really, or they may be containers for
2563 member files with their own local variable sections, which are
2564 not appropriate for the containing file.
2571 "List of regexps matching suffixes to remove from file names.
2572 The function `inhibit-local-variables-p' uses this: when checking
2573 a file name, it first discards from the end of the name anything that
2576 ;; Can't think of any situation in which you'd want this to be nil...
2581 "Return non-nil if file local variables should be ignored.
2582 This checks the file (or buffer) name against `inhibit-local-variables-regexps'
2583 and `inhibit-local-variables-suffixes'. If
2584 `inhibit-local-variables-ignore-case' is non-nil, this ignores case."
2593 sufs)
2598 temp))
2603 "Regexp matching interpreters, for file mode determination.
2604 This regular expression is matched against the first line of a file
2605 to determine the file's mode in `set-auto-mode'. If it matches, the file
2606 is assumed to be interpreted by the interpreter matched by the second group
2607 of the regular expression. The mode is then determined as the mode
2611 "Alist of buffer beginnings vs. corresponding major mode functions.
2612 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2613 After visiting a file, if REGEXP matches the text at the beginning of the
2614 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2615 call FUNCTION rather than allowing `auto-mode-alist' to decide the buffer's
2616 major mode.
2618 If FUNCTION is nil, then it is not called. (That is a way of saying
2626 ;; The < comes before the groups (but the first) to reduce backtracking.
2627 ;; TODO: UTF-16 <?xml may be preceded by a BOM 0xff 0xfe or 0xfe 0xff.
2628 ;; We use [ \t\r\n] instead of `\\s ' to make regex overflow less likely.
2632 comment-re "*"
2635 . html-mode)
2637 ;; These two must come after html, because they are more general:
2642 . sgml-mode)
2645 "Like `magic-mode-alist' but has lower priority than `auto-mode-alist'.
2646 Each element looks like (REGEXP . FUNCTION) or (MATCH-FUNCTION . FUNCTION).
2647 After visiting a file, if REGEXP matches the text at the beginning of the
2648 buffer, or calling MATCH-FUNCTION returns non-nil, `normal-mode' will
2649 call FUNCTION, provided that `magic-mode-alist' and `auto-mode-alist'
2650 have not specified a mode for this file.
2656 "Upper limit on `magic-mode-alist' regexp matches.
2660 "Select major mode appropriate for current buffer.
2662 To find the right major mode, this function checks for a -*- mode tag
2663 checks for a `mode:' entry in the Local Variables section of the file,
2664 checks if it uses an interpreter listed in `interpreter-mode-alist',
2665 matches the buffer beginning against `magic-mode-alist',
2666 compares the filename against the entries in `auto-mode-alist',
2667 then matches the buffer beginning against `magic-fallback-mode-alist'.
2669 If `enable-local-variables' is nil, or if the file name matches
2670 `inhibit-local-variables-regexps', this function does not check
2671 for any mode: tag anywhere in the file. If `local-enable-local-variables'
2672 is nil, then the only mode: tag that can be relevant is a -*- one.
2674 If the optional argument KEEP-MODE-IF-SAME is non-nil, then we
2675 set the major mode only if that would change it. In other words
2676 we don't actually set it to the same mode the buffer already has."
2677 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
2679 end done mode modes)
2680 ;; Once we drop the deprecated feature where mode: is also allowed to
2681 ;; specify minor-modes (ie, there can be more than one "mode:"), we can
2682 ;; remove this section and just let (hack-local-variables t) handle it.
2683 ;; Find a -*- mode tag.
2687 ;; Note by design local-enable-local-variables does not matter here.
2689 try-locals
2692 ;; Find all specifications for the `mode:' variable
2693 ;; and execute them left to right.
2705 modes)))
2706 ;; Simple -*-MODE-*- case.
2709 modes))))
2710 ;; If we found modes to use, invoke them now, outside the save-excursion.
2718 ;; continuing would call minor modes again, toggling them off
2720 ;; hack-local-variables checks local-enable-local-variables etc, but
2721 ;; we might as well be explicit here for the sake of clarity.
2723 enable-local-variables
2724 local-enable-local-variables
2725 try-locals
2732 ;; If we didn't, look for an interpreter specified in the first line.
2733 ;; As a special case, allow for things like "#!/bin/env perl", which
2734 ;; finds the interpreter anywhere in $PATH.
2740 ;; Map interpreter name to a mode, signaling we're done at the
2741 ;; same time.
2748 interpreter-mode-alist)
2750 ;; If we found an interpreter mode to use, invoke it now.
2752 ;; Next try matching the buffer beginning against magic-mode-alist.
2766 ;; Next compare the filename against the entries in auto-mode-alist.
2771 ;; Remove backup-suffixes from file name.
2773 ;; Remove remote file name identification.
2778 ;; Find first matching alist entry.
2781 ;; System is case-insensitive.
2785 ;; System is case-sensitive.
2787 ;; First match case-sensitively.
2791 ;; Fallback to case-insensitive match.
2805 ;; Next try matching the buffer beginning against magic-fallback-mode-alist.
2822 ;; When `keep-mode-if-same' is set, we are working on behalf of
2823 ;; set-visited-file-name. In that case, if the major mode specified is the
2824 ;; same one we already have, don't actually reset it. We don't want to lose
2825 ;; minor modes such as Font Lock.
2827 "Apply MODE and return it.
2828 If optional arg KEEP-MODE-IF-SAME is non-nil, MODE is chased of
2829 any aliases and compared to current major mode. If they are the
2830 same, do nothing and return nil."
2836 mode)))
2839 "Regexp of lines to skip when looking for file-local settings.
2840 If the first line matches this regular expression, then the -*-...-*- file-
2844 "Find the -*- spec in the buffer.
2845 Call with point at the place to start searching from.
2846 If one is found, set point to the beginning and return the position
2847 of the end. Otherwise, return nil; may change point.
2848 The variable `inhibit-local-variables-regexps' can cause a -*- spec to
2849 be ignored; but `enable-local-variables' and `local-enable-local-variables'
2850 have no effect."
2853 ;; Don't look for -*- if this file name matches any
2854 ;; of the regexps in inhibit-local-variables-regexps.
2857 ;; If the file begins with "#!" (exec
2858 ;; interpreter magic), look for mode frobs
2859 ;; in the first two lines. You cannot
2860 ;; necessarily put them in the first line
2861 ;; of such a file without screwing up the
2862 ;; interpreter invocation. The same holds
2863 ;; for '\" in man pages (preprocessor
2864 ;; magic for the `man' program).
2875 end))))
2876 \f
2877 ;;; Handling file local variables
2881 file-local-variables-alist dir-local-variables-alist)
2886 "Normal hook run after processing a file's local variables specs.
2887 Major modes can use this to examine user-specified local variables
2891 "List variable-value pairs that are considered safe.
2892 Each element is a cons cell (VAR . VAL), where VAR is a variable
2893 symbol and VAL is a value that is considered safe."
2894 :risky t
2899 ;; This should be here at least as long as Emacs supports write-file-hooks.
2904 "Expressions that are considered safe in an `eval:' local variable.
2905 Add expressions to this list if you want Emacs to evaluate them, when
2906 they appear in an `eval' local variable specification, without first
2907 asking you for confirmation."
2908 :risky t
2913 ;; Risky local variables:
2916 buffer-auto-save-file-name
2917 buffer-file-name
2918 buffer-file-truename
2919 buffer-undo-list
2920 debugger
2921 default-text-properties
2922 eval
2923 exec-directory
2924 exec-path
2925 file-name-handler-alist
2926 frame-title-format
2927 global-mode-string
2928 header-line-format
2929 icon-title-format
2930 inhibit-quit
2931 load-path
2932 max-lisp-eval-depth
2933 max-specpdl-size
2934 minor-mode-map-alist
2935 minor-mode-overriding-map-alist
2936 mode-line-format
2937 mode-name
2938 overriding-local-map
2939 overriding-terminal-local-map
2940 process-environment
2941 standard-input
2942 standard-output
2943 unread-command-events))
2945 ;; Safe local variables:
2946 ;;
2947 ;; For variables defined by major modes, the safety declarations can go into
2948 ;; the major mode's file, since that will be loaded before file variables are
2949 ;; processed.
2950 ;;
2951 ;; For variables defined by minor modes, put the safety declarations in the
2952 ;; file defining the minor mode after the defcustom/defvar using an autoload
2953 ;; cookie, e.g.:
2954 ;;
2955 ;; ;;;###autoload(put 'variable 'safe-local-variable 'stringp)
2956 ;;
2957 ;; Otherwise, when Emacs visits a file specifying that local variable, the
2958 ;; minor mode file may not be loaded yet.
2959 ;;
2960 ;; For variables defined in the C source code the declaration should go here:
2982 "Alist of file-local variable settings in the current buffer.
2983 Each element in this list has the form (VAR . VALUE), where VAR
2984 is a file-local variable (a symbol) and VALUE is the value
2985 specified. The actual value in the buffer may differ from VALUE,
2991 "Alist of directory-local variable settings in the current buffer.
2992 Each element in this list has the form (VAR . VALUE), where VAR
2993 is a directory-local variable (a symbol) and VALUE is the value
2994 specified in .dir-locals.el. The actual value in the buffer
2995 may differ from VALUE, if it is changed by the major or minor modes,
3000 "Normal hook run before setting file-local variables.
3001 It is called after checking for unsafe/risky variables and
3002 setting `file-local-variables-alist', and before applying the
3003 variables stored in `file-local-variables-alist'. A hook
3004 function is allowed to change the contents of this alist.
3006 This hook is called only if there is at least one file-local
3010 "Get confirmation before setting up local variable values.
3011 ALL-VARS is the list of all variables to be set up.
3012 UNSAFE-VARS is the list of those that aren't marked as safe or risky.
3013 RISKY-VARS is the list of those that are marked as risky.
3014 If these settings come from directory-local variables, then
3015 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3022 unsafe-vars))
3024 ;; Set up the contents of the *Local Variables* buffer.
3032 ", and variables that are risky (**)."
3040 y -- to apply the local variables list.
3044 ! -- to apply the local variables list, and permanently mark these
3056 ;; Make strings with embedded whitespace easier to read.
3064 ;; Display the buffer and read a choice.
3072 ""
3075 char)
3094 "Return local variables specified in the -*- line.
3095 Returns an alist of elements (VAR . VAL), where VAR is a variable
3096 and VAL is the specified value. Ignores any specification for
3097 `mode:' and `coding:' (which should have already been handled
3098 by `set-auto-mode' and `set-auto-coding', respectively).
3099 Return nil if the -*- line is malformed.
3101 If MODE-ONLY is non-nil, just returns the symbol specifying the
3102 mode, if there is one, otherwise nil."
3107 result)
3109 nil)
3111 ;; Simple form: "-*- MODENAME -*-".
3115 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
3116 ;; (last ";" is optional).
3117 ;; If MODE-ONLY, just check for `mode'.
3118 ;; Otherwise, parse the -*- line into the RESULT alist.
3126 ;; There used to be a downcase here,
3127 ;; but the manual didn't say so,
3128 ;; and people want to set var names that aren't all lc.
3134 ;; It is traditional to ignore
3135 ;; case when checking for `mode' in set-auto-mode,
3136 ;; so we must do that here as well.
3137 ;; That is inconsistent, but we're stuck with it.
3138 ;; The same can be said for `coding' in set-auto-coding.
3148 ;; Downcase "Mode:".
3154 result))))))
3157 "Filter local variable settings, querying the user if necessary.
3158 VARIABLES is the alist of variable-value settings. This alist is
3159 filtered based on the values of `ignored-local-variables',
3160 `enable-local-eval', `enable-local-variables', and (if necessary)
3161 user interaction. The results are added to
3162 `file-local-variables-alist', without applying them.
3163 If these settings come from directory-local variables, then
3164 DIR-NAME is the name of the associated directory. Otherwise it is nil."
3165 ;; Find those variables that we may want to save to
3166 ;; `safe-local-variable-values'.
3172 ;; Ignore any variable in `ignored-local-variables'.
3173 nil)
3174 ;; Obey `enable-local-eval'.
3178 ;; In case previously marked safe (bug#5636).
3180 ;; If not safe and e-l-v = :safe, ignore totally.
3184 safe
3186 ;; Ignore duplicates (except `mode') in the present list.
3188 ;; Accept known-safe variables.
3192 ;; The variable is either risky or unsafe:
3199 ;; Query, unless all vars are safe or user wants no querying.
3205 risky-vars dir-name))
3215 ;; TODO? Warn once per file rather than once per session?
3219 "Parse and put into effect this buffer's local variables spec.
3220 Uses `hack-local-variables-apply' to apply the variables.
3223 is specified, and return the corresponding mode symbol, or nil.
3224 In this case, we try to ignore minor-modes, and only return a
3225 major-mode.
3227 If `enable-local-variables' or `local-enable-local-variables' is nil,
3228 this function does nothing. If `inhibit-local-variables-regexps'
3229 applies to the file in question, the file is not scanned for
3230 local variables, but directory-local variables may still be applied."
3231 ;; We don't let inhibit-local-variables-p influence the value of
3232 ;; enable-local-variables, because then it would affect dir-local
3233 ;; variables. We don't want to search eg tar files for file local
3234 ;; variable sections, but there is no reason dir-locals cannot apply
3235 ;; to them. The real meaning of inhibit-local-variables-p is "do
3236 ;; not scan this file for local variables".
3239 result)
3243 ;; Note this is a no-op if enable-local-variables is nil.
3245 ;; This entire function is basically a no-op if enable-local-variables
3246 ;; is nil. All it does is set file-local-variables-alist to nil.
3248 ;; This part used to ignore enable-local-variables when mode-only
3249 ;; was non-nil. That was inappropriate, eg consider the
3250 ;; (artificial) example of:
3251 ;; (setq local-enable-local-variables nil)
3252 ;; Open a file foo.txt that contains "mode: sh".
3253 ;; It correctly opens in text-mode.
3254 ;; M-x set-visited-file name foo.c, and it incorrectly stays in text-mode.
3256 ;; If MODE-ONLY is non-nil, and the prop line specifies a
3257 ;; mode, then we're done, and have no need to scan further.
3259 mode-only))
3260 ;; Look for "Local variables:" line in last page.
3268 ;; suffix is what comes after "local variables:" in its line.
3269 ;; prefix is what comes before "local variables:" in its line.
3282 endpos
3288 nil t))
3289 ;; This used to be an error, but really all it means is
3290 ;; that this may simply not be a local-variables section,
3291 ;; so just ignore it.
3301 ;; Discard the prefix.
3306 ;; Discard the suffix.
3315 ;; Find the variable name;
3323 val val2)
3326 ;; Read the variable value.
3333 ;; Specifying minor-modes via mode: is
3334 ;; deprecated, but try to reject them anyway.
3348 'eval
3352 ;; Now we've read all the local variables.
3353 ;; If MODE-ONLY is non-nil, return whether the mode was specified.
3355 ;; Otherwise, set the variables.
3360 "Apply the elements of `file-local-variables-alist'.
3361 If there are any elements, runs `before-hack-local-variables-hook',
3362 then calls `hack-one-local-variable' to apply the alist elements one by one.
3363 Finishes by running `hack-local-variables-hook', regardless of whether
3364 the alist is empty or not.
3366 Note that this function ignores a `mode' entry if it specifies the same
3367 major mode as the buffer already has."
3369 ;; Any 'evals must run in the Right sequence.
3378 "Non-nil if SYM is safe as a file-local variable with value VAL.
3379 It is safe if any of these conditions are met:
3381 * There is a matching entry (SYM . VAL) in the
3382 `safe-local-variable-values' user option.
3384 * The `safe-local-variable' property of SYM is a function that
3385 evaluates to a non-nil value with VAL as an argument."
3389 ;; If the function signals an error, that means it
3390 ;; can't assure us that the value is safe.
3394 "Non-nil if SYM could be dangerous as a file-local variable.
3395 It is dangerous if either of these conditions are met:
3397 * Its `risky-local-variable' property is non-nil.
3403 ;; If this is an alias, check the base name.
3423 "Return t if it is safe to eval EXP when it is found in a file."
3425 ;; Detect certain `put' expressions.
3432 lisp-indent-function
3433 scheme-indent-function))
3434 ;; Only allow safe values (not functions).
3439 ;; Only allow indirect form specs.
3440 ;; During bootstrapping, edebug-basic-spec might not be
3441 ;; defined yet.
3445 ;; Allow expressions that the user requested.
3447 ;; Certain functions can be allowed with safe arguments
3448 ;; or can specify verification functions to try.
3450 ;; Allow (minor)-modes calls with no arguments.
3451 ;; This obsoletes the use of "mode:" for such things. (Bug#8613)
3460 ok))
3468 ok))))))))
3481 "Set local variable VAR with value VAL.
3482 If VAR is `mode', call `VAL-mode' as a function unless it's
3483 already the major mode."
3485 (`mode
3491 (`eval
3497 ;; Make sure the string has no text properties.
3498 ;; Some text properties can get evaluated in various ways,
3499 ;; so it is risky to put them on with a local variable list.
3503 \f
3504 ;;; Handling directory-local variables, aka project settings.
3510 "List of cached directory roots for directory-local variable classes.
3511 Each element in this list has the form (DIR CLASS MTIME).
3512 DIR is the name of the directory.
3513 CLASS is the name of a variable class (a symbol).
3514 MTIME is the recorded modification time of the directory-local
3515 variables file associated with this entry. This time is a list
3516 of integers (the same format as `file-attributes'), and is
3517 used to test whether the cache entry is still valid.
3518 Alternatively, MTIME can be nil, which means the entry is always
3522 "Return the variable list for CLASS."
3526 "Collect directory-local variables from MODE-VARIABLES.
3527 VARIABLES is the initial list of variables.
3528 Returns the new list."
3533 ;; If variables are specified more than once, only use the last. (Why?)
3534 ;; The pseudo-variables mode and eval are different (bug#3430).
3537 ;; Need a new cons in case we setcdr later.
3541 "Collect entries from CLASS-VARIABLES into VARIABLES.
3542 ROOT is the root directory of the project.
3543 Return the new variables list."
3546 ;; FIXME: Why not use file-relative-name?
3553 ;; Don't include this in the previous condition, because we
3554 ;; want to filter all strings before the next condition.
3568 ;; TODO someone might want to extend this to allow
3569 ;; integer values for subdir, where N means
3570 ;; variables apply to this directory and N levels
3571 ;; below it (0 == nil).
3574 alist variables))))))))
3576 ;; The file's content might be invalid (e.g. have a merge conflict), but
3577 ;; that shouldn't prevent the user from opening the file.
3579 nil))))
3582 "Declare that the DIRECTORY root is an instance of CLASS.
3583 DIRECTORY is the name of a directory, a string.
3584 CLASS is the name of a project class, a symbol.
3585 MTIME is either the modification time of the directory-local
3586 variables file that defined this class, or nil.
3588 When a file beneath DIRECTORY is visited, the mode-specific
3589 variables from CLASS are applied to the buffer. The variables
3590 for a class are defined using `dir-locals-set-class-variables'."
3597 "Map the type CLASS to a list of variable settings.
3598 CLASS is the project class, a symbol. VARIABLES is a list
3599 that declares directory-local variables for the class.
3600 An element in VARIABLES is either of the form:
3601 (MAJOR-MODE . ALIST)
3602 or
3603 (DIRECTORY . LIST)
3605 In the first form, MAJOR-MODE is a symbol, and ALIST is an alist
3606 whose elements are of the form (VARIABLE . VALUE).
3608 In the second form, DIRECTORY is a directory name (a string), and
3609 LIST is a list of the form accepted by the function.
3611 When a file is visited, the file's class is found. A directory
3612 may be assigned a class using `dir-locals-set-directory-class'.
3613 Then variables are set in the file's buffer according to the
3614 VARIABLES list of the class. The list is processed in order.
3616 * If the element is of the form (MAJOR-MODE . ALIST), and the
3617 buffer's major mode is derived from MAJOR-MODE (as determined
3618 by `derived-mode-p'), then all the variables in ALIST are
3619 applied. A MAJOR-MODE of nil may be used to match any buffer.
3620 `make-local-variable' is called for each variable before it is
3621 set.
3623 * If the element is of the form (DIRECTORY . LIST), and DIRECTORY
3624 is an initial substring of the file's directory, then LIST is
3625 applied by recursively following these rules."
3632 "File that contains directory-local variables.
3633 It has to be constant to enforce uniform values
3637 "Find the directory-local variables for FILE.
3638 This searches upward in the directory tree from FILE.
3639 It stops at the first directory that has been registered in
3640 `dir-locals-directory-cache' or contains a `dir-locals-file'.
3641 If it finds an entry in the cache, it checks that it is valid.
3642 A cache entry with no modification time element (normally, one that
3643 has been assigned directly using `dir-locals-set-directory-class', not
3644 set from a file) is always valid.
3645 A cache entry based on a `dir-locals-file' is valid if the modification
3646 time stored in the cache matches the current file modification time.
3647 If not, the cache entry is cleared so that the file will be re-read.
3649 This function returns either nil (no directory local variables found),
3650 or the matching entry from `dir-locals-directory-cache' (a list),
3651 or the full path to the `dir-locals-file' (a string) in the case
3652 of no valid cache entry."
3657 dir-locals-file))
3660 ;; `locate-dominating-file' may have abbreviated the name.
3663 ;; Let dir-locals-read-from-file inform us via demoted-errors
3664 ;; about unreadable files, etc.
3665 ;; Maybe we'd want to keep searching though - that is
3666 ;; a locate-dominating-file issue.
3667 ;;; (or (not (file-readable-p locals-file))
3668 ;;; (not (file-regular-p locals-file)))
3669 ;;; (setq locals-file nil))
3670 ;; Find the best cached value in `dir-locals-directory-cache'.
3682 ;; Found a potential cache entry. Check validity.
3683 ;; A cache entry with no MTIME is assumed to always be valid
3684 ;; (ie, set directly, not from a dir-locals file).
3685 ;; Note, we don't bother to check that there is a matching class
3686 ;; element in dir-locals-class-alist, since that's done by
3687 ;; dir-locals-set-directory-class.
3694 ;; This cache entry is OK.
3695 dir-elt
3696 ;; This cache entry is invalid; clear it.
3699 ;; Return the first existing dir-locals file. Might be the same
3700 ;; as dir-elt's, might not (eg latter might have been deleted).
3701 locals-file)
3702 ;; No cache entry.
3703 locals-file)))
3706 "Load a variables FILE and register a new class and instance.
3707 FILE is the name of the file holding the variables to apply.
3708 The new class name is the same as the directory in which FILE
3709 is found. Returns the new class name."
3721 class-name)))))
3724 "Non-nil means dir-local variables will be applied to remote files."
3732 "Read per-directory local variables for the current buffer.
3733 Store the directory-local variables in `dir-local-variables-alist'
3734 and `file-local-variables-alist', without applying them.
3736 This does nothing if either `enable-local-variables' or
3737 `enable-dir-local-variables' are nil."
3739 enable-dir-local-variables
3742 default-directory)))))
3743 ;; Find the variables file.
3773 "Apply directory-local variables to a non-file buffer.
3774 For non-file buffers, such as Dired buffers, directory-local
3775 variables are looked for in `default-directory' and its parent
3776 directories."
3780 \f
3783 However, the mode will not be changed if
3784 \(1) a local variables list or the `-*-' line specifies a major mode, or
3786 \ not suitable for ordinary files, or
3787 \(3) the new file name does not particularly specify any mode."
3792 "Change name of file visited in current buffer to FILENAME.
3793 This also renames the buffer to correspond to the new file.
3794 The next time the buffer is saved it will go in the newly specified file.
3795 FILENAME nil or an empty string means mark buffer as not visiting any file.
3796 Remember to delete the initial contents of the minibuffer
3797 if you wish to pass an empty string as the argument.
3799 The optional second argument NO-QUERY, if non-nil, inhibits asking for
3800 confirmation in the case where another buffer is already visiting FILENAME.
3802 The optional third argument ALONG-WITH-FILE, if non-nil, means that
3803 the old visited file has been renamed to the new name FILENAME."
3811 nil
3826 filename)))
3833 buffer-file-name filename)
3837 ;; If new-name == old-name, renaming would add a spurious <2>
3838 ;; and it's considered as a feature in rename-buffer.
3844 ;; Abbreviate the file names of the buffer.
3853 nil))
3854 ;; write-file-functions is normally used for things like ftp-find-file
3855 ;; that visit things that are not local files as if they were files.
3856 ;; Changing to visit an ordinary local file instead should flush the hook.
3861 ;; If buffer was read-only because of version control,
3862 ;; that reason is gone now, so make it writable.
3866 ;; Turn off backup files for certain file names.
3867 ;; Since this is a permanent local, the major mode won't eliminate it.
3869 backup-enable-predicate
3875 ;; If auto-save was not already on, turn it on if appropriate.
3879 ;; If auto save is on, start using a new name.
3880 ;; We deliberately don't rename or delete the old auto save
3881 ;; for the old visited file name. This is because perhaps
3882 ;; the user wants to save the new state and then compare with the
3883 ;; previous state from the auto save file.
3886 ;; Rename the old auto save file if any.
3893 ;; Update the major mode, if the file name determines it.
3895 ;; Don't change the mode if it is special.
3898 ;; Don't change the mode if the local variable list specifies it.
3899 ;; The file name can influence whether the local variables apply.
3901 ;; h-l-v also checks it, but might as well be explicit.
3904 ;; TODO consider making normal-mode handle this case.
3912 "Write current buffer into file FILENAME.
3913 This makes the buffer visit that file, and marks it as not modified.
3915 If you specify just a directory name as FILENAME, that means to use
3916 the default file name but in that directory. You can also yank
3917 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
3919 If the buffer is not already visiting a file, the default file name
3920 for the output file is the buffer name.
3922 If optional second arg CONFIRM is non-nil, this function
3923 asks for confirmation before overwriting an existing file.
3924 Interactively, confirmation is required unless you supply a prefix argument."
3925 ;; (interactive "FWrite file: ")
3929 nil nil nil nil)
3933 default-directory)
3934 nil nil))
3938 ;; If arg is just a directory,
3939 ;; use the default file name, but in that directory.
3946 ;; NS does its own confirm dialog.
3949 use-dialog-box))
3954 ;; Make buffer writable if file is writable.
3959 ;; It's likely that the VC status at the new location is different from
3960 ;; the one at the old location.
3962 \f
3964 "Return an alist of extended attributes of file FILENAME.
3966 Extended attributes are platform-specific metadata about the file,
3967 such as SELinux context, list of ACL entries, etc."
3972 "Set extended attributes of file FILENAME to ATTRIBUTES.
3974 ATTRIBUTES must be an alist of file attributes as returned by
3975 `file-extended-attributes'."
3983 \f
3985 "Make a backup of the disk file visited by the current buffer, if appropriate.
3986 This is normally done before saving the buffer the first time.
3988 A backup may be done by renaming or by copying; see documentation of
3989 variable `make-backup-files'. If it's done by renaming, then the file is
3990 no longer accessible under its old name.
3992 The value is non-nil after a backup was made by renaming.
3993 It has the form (MODES EXTENDED-ATTRIBUTES BACKUPNAME).
3994 MODES is the result of `file-modes' on the original
3995 file; this means that the caller, after saving the buffer, should change
3996 the modes of the new file to agree with the old modes.
3997 EXTENDED-ATTRIBUTES is the result of `file-extended-attributes'
3998 on the original file; this means that the caller, after saving
3999 the buffer, should change the extended attributes of the new file
4000 to agree with the old attributes.
4001 BACKUPNAME is the backup file name, which is the old file renamed."
4008 backup-info backupname targets setmodes)
4009 ;; If specified name is a symbolic link, chase it to the target.
4010 ;; Thus we make the backups in the directory where the real file is.
4015 ;; (if (file-directory-p buffer-file-name)
4016 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
4020 ;; If have old versions to maybe delete,
4021 ;; ask the user to confirm now, before doing anything.
4022 ;; But don't actually delete til later.
4027 real-file-name)))))
4031 ;; Actually write the back up file.
4034 ; (file-symlink-p buffer-file-name)
4035 backup-by-copying
4036 ;; Don't rename a suid or sgid file.
4049 real-file-name t))))))
4051 backupname modes
4052 extended-attributes)
4053 ;; rename-file should delete old backup.
4056 backupname)))
4058 ;; If trouble writing the backup, write it in
4059 ;; .emacs.d/%backup%.
4062 backupname)
4065 modes extended-attributes)))
4067 ;; Now delete the old versions, if desired.
4074 setmodes)
4081 ;; Create temp files with strict access rights. It's easy to
4082 ;; loosen them later, whereas it's impossible to close the
4083 ;; time-window of loose permissions otherwise.
4086 ;; Try to overwrite old backup first.
4094 nil)
4096 ;; The file was somehow created by someone else between
4097 ;; `delete-file' and `copy-file', so let's try again.
4098 ;; rms says "I think there is also a possible race
4099 ;; condition for making backup files" (emacs-devel 20070821).
4100 nil)))
4101 ;; Reset the umask.
4103 ;; If set-file-extended-attributes fails, fall back on set-file-modes.
4112 ;; The last ~[[:digit]]+ matches relative versions in git,
4113 ;; e.g. `foo.js.~HEAD~1~'.
4114 "Regular expression matching the backup/version part of a file name.
4118 "Return file NAME sans backup versions or strings.
4119 This is a separate procedure so your site-init or startup file can
4120 redefine it.
4121 If the optional argument KEEP-BACKUP-VERSION is non-nil,
4122 we do not remove backup version numbers, only true file version numbers.
4123 See also `file-name-version-regexp'."
4130 name))))))
4133 "Return t if deleting FILE and rewriting it would preserve the owner.
4134 Return nil if FILE does not exist, or if deleting and recreating it
4135 might not preserve the owner. If GROUP is non-nil, check whether
4136 the group would be preserved too."
4141 ;; Return t if the file doesn't exist, since it's true that no
4142 ;; information would be lost by an (attempted) delete and create.
4145 ;; Files created on Windows by Administrator (RID=500)
4146 ;; have the Administrators group (RID=544) recorded as
4147 ;; their owner. Rewriting them will still preserve the
4148 ;; owner.
4152 ;; On BSD-derived systems files always inherit the parent
4153 ;; directory's group, so skip the group-gid test.
4159 ;; On some systems, a file created in a setuid directory
4160 ;; inherits that directory's owner.
4164 ;; On many systems, a file created in a setgid directory
4165 ;; inherits that directory's group. On some systems
4166 ;; this happens even if the setgid bit is not set.
4173 The extension, in a file name, is the part that follows the last `.',
4174 except that a leading `.', if any, doesn't count."
4177 directory)
4181 ;; Don't use expand-file-name here; if DIRECTORY is relative,
4182 ;; we don't want to expand it.
4185 filename))))
4189 The extension, in a file name, is the part that follows the last `.',
4190 excluding version numbers and backup suffixes,
4191 except that a leading `.', if any, doesn't count.
4192 Return nil for extensionless file names such as `foo'.
4193 Return the empty string for file names such as `foo.'.
4195 If PERIOD is non-nil, then the returned value includes the period
4196 that delimits the extension, and if FILENAME has no extension,
4207 "Return the base name of the FILENAME: no directory, no extension.
4208 FILENAME defaults to `buffer-file-name'."
4213 #'make-backup-file-name--default-function
4214 "A function to use instead of the default `make-backup-file-name'.
4216 This could be buffer-local to do something special for specific
4217 files. If you define it, you may need to change `backup-file-name-p'
4218 and `file-name-sans-versions' too.
4220 See also `backup-directory-alist'."
4225 "Alist of filename patterns and backup directory names.
4226 Each element looks like (REGEXP . DIRECTORY). Backups of files with
4227 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
4228 relative or absolute. If it is absolute, so that all matching files
4229 are backed up into the same directory, the file names in this
4230 directory will be the full name of the file backed up with all
4231 directory separators changed to `!' to prevent clashes. This will not
4232 work correctly if your filesystem truncates the resulting name.
4234 For the common case of all backups going into one directory, the alist
4236 directory name.
4238 If this variable is nil, or it fails to match a filename, the backup
4239 is made in the original file's directory.
4241 On MS-DOS filesystems without long names this variable is always
4242 ignored."
4248 "Default `backup-enable-predicate' function.
4249 Checks for files in `temporary-file-directory',
4250 `small-temporary-file-directory', and /tmp."
4252 caseless)
4253 ;; On MS-Windows, file-truename will convert short 8+3 aliases to
4254 ;; their long file-name equivalents, so compare-strings does TRT.
4258 caseless t))
4261 ;; Directory is under temporary-file-directory.
4266 ;; Directory is under /tmp.
4271 0 nil
4273 ;; Directory is under small-temporary-file-directory.
4278 "Create the non-numeric backup file name for FILE.
4279 Normally this will just be the file's name with `~' appended.
4280 Customization hooks are provided as follows.
4282 The value of `make-backup-file-name-function' should be a function which
4283 will be called with FILE as its argument; the resulting name is used.
4285 By default, a match for FILE is sought in `backup-directory-alist'; see
4286 the documentation of that variable. If the directory for the backup
4287 doesn't exist, it is created."
4290 file))
4304 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
4306 elt backup-directory abs-backup-directory)
4311 alist nil)))
4312 ;; If backup-directory is relative, it should be relative to the
4313 ;; file's directory. By expanding explicitly here, we avoid
4314 ;; depending on default-directory.
4323 abs-backup-directory nil))))
4325 file
4329 ;; Normalize DOSish file names: downcase the drive
4330 ;; letter, if any, and replace the leading "x:" with
4331 ;; "/drive_x".
4334 ;; Replace any invalid file-name characters (for the
4335 ;; case of backing up remote files).
4339 "drive_"
4342 ""
4345 ;; Make the name unique by substituting directory
4346 ;; separators. It may not really be worth bothering about
4347 ;; doubling `!'s in the original name...
4352 backup-directory))
4357 "Return non-nil if FILE is a backup file name (numeric or not).
4358 This is a separate function so you can redefine it for customization.
4359 You may need to redefine `file-name-sans-versions' as well."
4364 ;; This is used in various files.
4365 ;; The usage of backup-extract-version-start is not very clean,
4366 ;; but I can't see a good alternative, so as of now I am leaving it alone.
4368 "Given the name of a numeric backup file, FN, return the backup number.
4369 Uses the free variable `backup-extract-version-start', whose value should be
4370 the index in the name where the version number begins."
4377 "Find a file name for a backup file FN, and suggestions for deletions.
4378 Value is a list whose car is the name for the backup file
4379 and whose cdr is a list of old versions to consider deleting now.
4380 If the value is nil, don't make a backup.
4381 Uses `backup-directory-alist' in the same way as does
4382 `make-backup-file-name'."
4384 ;; Run a handler for this function so that ange-ftp can refuse to do it.
4388 ;; We don't support numbered backups on plain MS-DOS
4389 ;; when long file names are unavailable.
4399 possibilities deserve-versions-p versions)
4402 base-versions
4405 possibilities)
4406 #'<)
4411 kept-old-versions
4412 kept-new-versions
4419 ;; Delete nothing if there is overflow
4420 ;; in the number of versions to keep.
4426 v))))))))))
4429 "Return number of names file FILENAME has."
4432 ;; (defun file-relative-name (filename &optional directory)
4433 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4434 ;; This function returns a relative file name which is equivalent to FILENAME
4435 ;; when used with that default directory as the default.
4436 ;; If this is impossible (which can happen on MSDOS and Windows
4437 ;; when the file name and directory use different drive names)
4438 ;; then it returns FILENAME."
4439 ;; (save-match-data
4440 ;; (let ((fname (expand-file-name filename)))
4441 ;; (setq directory (file-name-as-directory
4442 ;; (expand-file-name (or directory default-directory))))
4443 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
4444 ;; ;; drive names, they can't be relative, so return the absolute name.
4445 ;; (if (and (or (eq system-type 'ms-dos)
4446 ;; (eq system-type 'cygwin)
4447 ;; (eq system-type 'windows-nt))
4448 ;; (not (string-equal (substring fname 0 2)
4449 ;; (substring directory 0 2))))
4450 ;; filename
4451 ;; (let ((ancestor ".")
4452 ;; (fname-dir (file-name-as-directory fname)))
4453 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
4454 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
4455 ;; (setq directory (file-name-directory (substring directory 0 -1))
4456 ;; ancestor (if (equal ancestor ".")
4457 ;; ".."
4458 ;; (concat "../" ancestor))))
4459 ;; ;; Now ancestor is empty, or .., or ../.., etc.
4460 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
4461 ;; ;; We matched within FNAME's directory part.
4462 ;; ;; Add the rest of FNAME onto ANCESTOR.
4463 ;; (let ((rest (substring fname (match-end 0))))
4464 ;; (if (and (equal ancestor ".")
4465 ;; (not (equal rest "")))
4466 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
4467 ;; rest
4468 ;; (concat (file-name-as-directory ancestor) rest)))
4469 ;; ;; We matched FNAME's directory equivalent.
4470 ;; ancestor))))))
4473 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
4474 This function returns a relative file name which is equivalent to FILENAME
4475 when used with that default directory as the default.
4476 If FILENAME is a relative file name, it will be interpreted as existing in
4477 `default-directory'.
4478 If FILENAME and DIRECTORY lie on different machines or on different drives
4479 on a DOS/Windows machine, it returns FILENAME in expanded form."
4483 default-directory))))
4488 read-file-name-completion-ignore-case)))
4491 ;; Test for different filesystems on DOS/Windows
4493 ;; Should `cygwin' really be included here? --stef
4496 ;; Test for different drive letters
4498 ;; Test for UNCs on different servers
4503 ;; Windows file names cannot have ? in
4504 ;; them, so use that to detect when
4505 ;; neither FILENAME nor DIRECTORY is a
4506 ;; UNC.
4508 0 nil
4514 ;; Test for different remote file system identification
4516 filename
4522 directory nil nil fold-case))
4524 directory nil nil fold-case))))
4527 ".."
4529 ;; Now ancestor is empty, or .., or ../.., etc.
4531 directory nil nil fold-case))
4532 ;; We matched within FILENAME's directory part.
4533 ;; Add the rest of FILENAME onto ANCESTOR.
4536 ;; But don't bother with ANCESTOR if it would give us `./'.
4537 rest
4539 ;; We matched FILENAME's directory equivalent.
4540 ancestor))))))
4541 \f
4543 "Save current buffer in visited file if modified.
4544 Variations are described below.
4546 By default, makes the previous version into a backup file
4547 if previously requested or if this is the first save.
4549 to become a backup when the next save is done.
4551 unconditionally makes the previous version into a backup file.
4553 to become a backup when the next save is done,
4554 and unconditionally makes the previous version into a backup file.
4556 With a numeric prefix argument of 0, never make the previous version
4557 into a backup file.
4559 If a file's name is FOO, the names of its numbered backup versions are
4560 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
4561 Numeric backups (rather than FOO~) will be made if value of
4562 `version-control' is not the atom `never' and either there are already
4563 numeric versions of the file being backed up, or `version-control' is
4564 non-nil.
4565 We don't want excessive versions piling up, so there are variables
4566 `kept-old-versions', which tells Emacs how many oldest versions to keep,
4567 and `kept-new-versions', which tells how many newest versions to keep.
4568 Defaults are 2 old versions and 2 new.
4569 `dired-kept-versions' controls dired's clean-directory (.) command.
4570 If `delete-old-versions' is nil, system will query user
4571 before trimming versions. Otherwise it does it silently.
4573 If `vc-make-backup-files' is nil, which is the default,
4574 no backup files are made for files managed by version control.
4575 (This is because the version control system itself records previous versions.)
4577 See the subroutine `basic-save-buffer' for more information."
4583 ;; We used to display the message below only for files > 50KB, but
4584 ;; then Rmail-mbox never displays it due to buffer swapping. If
4585 ;; the test is ever re-introduced, be sure to handle saving of
4586 ;; Rmail files.
4593 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
4594 Normally delete only if the file was written by this Emacs since
4595 the last real save, but optional arg FORCE non-nil means delete anyway."
4609 "Normal hook that is run before a buffer is saved to its file."
4615 "Normal hook that is run after a buffer is saved to its file."
4621 "If non-nil, use this coding system for saving the buffer.
4622 More precisely, use this coding system in place of the
4623 value of `buffer-file-coding-system', when saving the buffer.
4624 Calling `write-region' for any purpose other than saving the buffer
4625 will still use `buffer-file-coding-system'; this variable has no effect
4632 "Save the current buffer in its visited file, if it has been modified.
4633 The hooks `write-contents-functions' and `write-file-functions' get a chance
4634 to do the job of saving; if they do not, then the buffer is saved in
4635 the visited file in the usual way.
4636 Before and after saving the buffer, this function runs
4637 `before-save-hook' and `after-save-hook', respectively."
4640 ;; In an indirect buffer, save its base buffer instead.
4644 ;; handle the case when no modification has been made but
4645 ;; the file disappeared since visited
4649 setmodes)
4650 ;; If buffer has no file name, ask user for one.
4658 ;; Signal an error if the user specified the name of an
4659 ;; existing directory.
4662 filename))
4669 "%s has changed since visited or saved. Save anyway? "
4689 ;; Support VC version backups.
4691 ;; Don't let errors prevent saving the buffer.
4696 ;; If a hook returned t, file is already "written".
4697 ;; Otherwise, write it the usual way now.
4706 ;; Now we have saved the current buffer. Let's make sure
4707 ;; that buffer-file-coding-system is fixed to what
4708 ;; actually used for saving by binding it locally.
4723 ;; If the auto-save file was recent before this command,
4724 ;; delete it now.
4726 ;; Support VC `implicit' locking.
4731 ;; This does the "real job" of writing a buffer into its visited file
4732 ;; and making a backup file. This is what is normally done
4733 ;; but inhibited if one of write-file-functions returns non-nil.
4734 ;; It returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4735 ;; backup-buffer.
4745 ;; This returns a value (MODES EXTENDED-ATTRIBUTES BACKUPNAME), like
4746 ;; backup-buffer.
4759 "File %s is write-protected; try to save anyway? "
4761 buffer-file-name)))
4764 ;; This may involve prompting, so do it now before backing up the file.
4765 ;; Otherwise there can be a delay while the user answers the
4766 ;; prompt during which the original file has been renamed. (Bug#13522)
4768 ;; Args here should match write-region call below around
4769 ;; which we use writecoding.
4771 buffer-file-truename))
4784 ;; Write temp name, then rename it.
4785 ;; This requires write access to the containing dir,
4786 ;; which is why we don't try it if we don't have that access.
4788 tempname succeed
4791 ;; Create temp files with strict access rights. It's easy to
4792 ;; loosen them later, whereas it's impossible to close the
4793 ;; time-window of loose permissions otherwise.
4798 ;; Try various temporary names.
4799 ;; This code follows the example of make-temp-file,
4800 ;; but it calls write-region in the appropriate way
4801 ;; for saving the buffer.
4807 ;; Pass in nil&nil rather than point-min&max
4808 ;; cause we're saving the whole buffer.
4809 ;; write-region-annotate-functions may use it.
4811 tempname nil realname
4813 nil)
4815 ;; The file was somehow created by someone else between
4816 ;; `make-temp-name' and `write-region', let's try again.
4817 nil)
4819 ;; Reset the umask.
4821 ;; If we failed, restore the buffer's modtime.
4824 ;; Since we have created an entirely new file,
4825 ;; make sure it gets the right permission bits set.
4830 buffer-file-name)))
4831 ;; We succeeded in writing the temp file,
4832 ;; so rename it.
4834 ;; If file not writable, see if we can make it writable
4835 ;; temporarily while we write it.
4836 ;; But no need to do so if we have just backed it up
4837 ;; (setmodes is set) because that says we're superseding.
4839 ;; Change the mode back, after writing.
4842 buffer-file-name))
4843 ;; If set-file-extended-attributes fails, fall back on
4844 ;; set-file-modes.
4853 ;; Pass in nil&nil rather than point-min&max to indicate
4854 ;; we're saving the buffer rather than just a region.
4855 ;; write-region-annotate-functions may make us of it.
4859 buffer-file-name nil t buffer-file-truename)
4861 ;; If we get an error writing the new file, and we made
4862 ;; the backup by renaming, undo the backing-up.
4867 setmodes))
4873 `((?\C-r
4880 ;; Return nil to ask about BUF again.
4881 nil)
4894 ;; Return nil to ask about BUF again.
4895 nil)
4905 "Save some modified file-visiting buffers. Asks user about each one.
4906 You can answer `y' to save, `n' not to save, `C-r' to look at the
4907 buffer in question with `view-buffer' before deciding or `d' to
4908 view the differences using `diff-buffer-with-file'.
4910 This command first saves any buffers where `buffer-save-without-query' is
4911 non-nil, without asking.
4913 Optional argument (the prefix) non-nil means save all with no questions.
4914 Optional second argument PRED determines which buffers are considered:
4915 If PRED is nil, all the file-visiting buffers are considered.
4916 If PRED is t, then certain non-file buffers will also be considered.
4917 If PRED is a zero-argument function, it indicates for each buffer whether
4918 to consider it or not when called with that buffer current.
4920 See `save-some-buffers-action-alist' if you want to
4921 change the additional actions you can take on files."
4925 files-done abbrevs-done)
4927 ;; First save any buffers that we're supposed to save unconditionally.
4928 ;; That way the following code won't ask about them.
4933 ;; Ask about those buffers that merit it,
4934 ;; and record the number thus saved.
4938 ;; Note that killing some buffers may kill others via
4939 ;; hooks (e.g. Rmail and its viewing buffer).
4952 t
4964 save-some-buffers-action-alist))
4965 ;; Maybe to save abbrevs, and record whether
4966 ;; we either saved them or asked to.
4973 ;; Don't keep bothering user if he says no.
4986 \f
4988 "Clear out records of last mod time of visited file.
4989 Next attempt to save will certainly not complain of a discrepancy."
4993 "Mark current buffer as unmodified, not needing to be saved.
4996 It is not a good idea to use this function in Lisp programs, because it
4997 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
5011 "Insert contents of file FILENAME into buffer after point.
5012 Set mark after the inserted text.
5014 This function is meant for the user to run interactively.
5015 Don't call it from programs! Use `insert-file-contents' instead.
5016 \(Its calling sequence is different; see its documentation)."
5022 "Append the contents of the region to the end of file FILENAME.
5023 When called from a function, expects three arguments,
5024 START, END and FILENAME. START and END are normally buffer positions
5025 specifying the part of the buffer to write.
5026 If START is nil, that means to use the entire buffer contents.
5027 If START is a string, then output that string to the file
5028 instead of any buffer contents; END is ignored.
5030 This does character code conversion and applies annotations
5031 like `write-region' does."
5036 "Return most recent backup file for FILENAME or nil if no backups exist."
5037 ;; `make-backup-file-name' will get us the right directory for
5038 ;; ordinary or numeric backups. It might create a directory for
5039 ;; backups as a side-effect, according to `backup-directory-alist'.
5046 tem)
5055 newest))
5058 "Rename current buffer to a similar name not already taken.
5059 This function is useful for creating multiple shell process buffers
5060 or multiple mail buffers, etc.
5062 Note that some commands, in particular those based on `compilation-mode'
5063 \(`compile', `grep', etc.) will reuse the current buffer if it has the
5064 appropriate mode even if it has been renamed. So as well as renaming
5065 the buffer, you also need to switch buffers before running another
5066 instance of such commands."
5074 ;; If the existing buffer name has a <NNN>,
5075 ;; which isn't part of the file name (if any),
5076 ;; then get rid of that.
5082 "Create the directory DIR and optionally any nonexistent parent dirs.
5083 If DIR already exists as a directory, signal an error, unless
5084 PARENTS is non-nil.
5086 Interactively, the default choice of directory to create is the
5087 current buffer's default directory. That is useful when you have
5088 visited a file in a nonexistent directory.
5090 Noninteractively, the second (optional) argument PARENTS, if
5091 non-nil, says whether to create parent directories that don't
5092 exist. Interactively, this happens by default.
5094 If creating the directory or directories fail, an error will be
5095 raised."
5098 nil nil)
5099 t))
5100 ;; If default-directory is a remote directory,
5101 ;; make sure we find its make-directory handler.
5109 create-list)
5111 ;; If directory is its own parent, then we can't
5112 ;; keep looping forever
5127 "Delete the directory named DIRECTORY. Does not follow symlinks.
5128 If RECURSIVE is non-nil, all files in DIRECTORY are deleted as well.
5129 TRASH non-nil means to trash the directory instead, provided
5130 `delete-by-moving-to-trash' is non-nil.
5132 When called interactively, TRASH is t if no prefix argument is
5133 given. With a prefix argument, TRASH is nil."
5140 "Move directory to trash: "
5142 default-directory default-directory nil nil))))
5148 nil)
5150 ;; If default-directory is a remote directory, make sure we find its
5151 ;; delete-directory handler.
5158 ;; Only move non-empty dir to trash if recursive deletion was
5159 ;; requested. This mimics the non-`delete-by-moving-to-trash'
5160 ;; case, where the operation fails in delete-directory-internal.
5161 ;; As `move-file-to-trash' trashes directories (empty or
5162 ;; otherwise) as a unit, we do not need to recurse here.
5164 ;; Check if directory is empty apart from "." and "..".
5169 ;; Otherwise, call ourselves recursively if needed.
5173 ;; This test is equivalent to
5174 ;; (and (file-directory-p fn) (not (file-symlink-p fn)))
5175 ;; but more efficient
5179 ;; We do not want to delete "." and "..".
5185 "Return non-nil if files FILE1 and FILE2 name the same file.
5186 If FILE1 or FILE2 does not exist, the return value is unspecified."
5197 "Return non-nil if FILE is in DIR or a subdirectory of DIR.
5199 Return nil if DIR is not an existing directory."
5221 "Copy DIRECTORY to NEWNAME. Both args must be strings.
5222 This function always sets the file modes of the output files to match
5223 the corresponding input file.
5225 The third arg KEEP-TIME non-nil means give the output files the same
5226 last-modified time as the old ones. (This works on only some systems.)
5228 A prefix arg makes KEEP-TIME non-nil.
5230 Noninteractively, the last argument PARENTS says whether to
5231 create parent directories if they don't exist. Interactively,
5232 this happens by default.
5234 If NEWNAME names an existing directory, copy DIRECTORY as a
5235 subdirectory there. However, if called from Lisp with a non-nil
5236 optional argument COPY-CONTENTS, copy the contents of DIRECTORY
5237 directly into NEWNAME instead."
5244 default-directory default-directory nil nil)
5245 current-prefix-arg t nil)))
5248 directory newname))
5249 ;; If default-directory is a remote directory, make sure we find its
5250 ;; copy-directory handler.
5255 newname keep-time parents copy-contents)
5257 ;; Compute target name.
5262 ;; If NEWNAME is not an existing directory, create it;
5263 ;; that is where we will copy the files of DIRECTORY.
5265 ;; If NEWNAME is an existing directory and COPY-CONTENTS
5266 ;; is nil, copy into NEWNAME/[DIRECTORY-BASENAME].
5271 newname))
5275 newname))
5278 ;; Copy recursively.
5280 ;; We do not want to copy "." and "..".
5282 directory-files-no-dot-files-regexp))
5292 ;; Set directory attributes.
5298 \f
5299 ;; At time of writing, only info uses this.
5301 "Return a copy of DIRS with all non-existent directories removed.
5302 The optional argument KEEP is a list of directories to retain even if
5303 they don't exist, and REJECT is a list of directories to remove from
5304 DIRS, even if they exist; REJECT takes precedence over KEEP.
5306 Note that membership in REJECT and KEEP is checked using simple string
5307 comparison."
5313 dirs)))
5315 \f
5318 "Function to use to revert this buffer, or nil to do the default.
5319 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
5320 which are the arguments that `revert-buffer' received.
5321 It also has access to the `preserve-modes' argument of `revert-buffer'
5326 #'revert-buffer-insert-file-contents--default-function
5327 "Function to use to insert contents when reverting this buffer.
5328 Gets two args, first the nominal file name to use,
5329 and second, t if reading the auto-save file.
5339 "Function to check whether a non-file buffer needs reverting.
5340 This should be a function with one optional argument NOCONFIRM.
5341 Auto Revert Mode passes t for NOCONFIRM. The function should return
5342 non-nil if the buffer should be reverted. A return value of
5343 `fast' means that the need for reverting was not checked, but
5344 that reverting the buffer is fast. The buffer is current when
5345 this function is called.
5347 The idea behind the NOCONFIRM argument is that it should be
5348 non-nil if the buffer is going to be reverted without asking the
5349 user. In such situations, one has to be careful with potentially
5350 time consuming operations.
5352 For more information on how this variable is used by Auto Revert mode,
5356 "Normal hook for `revert-buffer' to run before reverting.
5357 If `revert-buffer-function' is used to override the normal revert
5361 "Normal hook for `revert-buffer' to run after reverting.
5362 Note that the hook value that it runs is the value that was in effect
5363 before reverting; that makes a difference if you have buffer-local
5364 hook functions.
5366 If `revert-buffer-function' is used to override the normal revert
5370 "Non-nil if a `revert-buffer' operation is in progress, nil otherwise.
5375 ;; `revert-buffer-function' was defined long ago to be a function of only
5376 ;; 2 arguments, so we have to use a dynbind variable to pass the
5377 ;; `preserve-modes' argument of `revert-buffer'.
5381 "Replace current buffer text with the text of the visited file on disk.
5382 This undoes all changes since the file was visited or saved.
5383 With a prefix argument, offer to revert from latest auto-save file, if
5384 that is more recent than the visited file.
5386 This command also implements an interface for special buffers
5387 that contain text which doesn't come from a file, but reflects
5388 some other data instead (e.g. Dired buffers, `buffer-list'
5389 buffers). This is done via the variable `revert-buffer-function'.
5390 In these cases, it should reconstruct the buffer contents from the
5391 appropriate data.
5393 When called from Lisp, the first argument is IGNORE-AUTO; only offer
5394 to revert from the auto-save file when this is nil. Note that the
5395 sense of this argument is the reverse of the prefix argument, for the
5396 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
5397 to nil.
5399 Optional second argument NOCONFIRM means don't ask for confirmation
5400 at all. (The variable `revert-without-query' offers another way to
5401 revert buffers without querying for confirmation.)
5403 Optional third argument PRESERVE-MODES non-nil means don't alter
5404 the files modes. Normally we reinitialize them using `normal-mode'.
5406 This function binds `revert-buffer-in-progress-p' non-nil while it operates.
5408 If the value of `revert-buffer-function' is non-nil, it is called to
5409 do all the work for this command. Otherwise, the hooks
5410 `before-revert-hook' and `after-revert-hook' are run at the beginning
5411 and the end, and if `revert-buffer-insert-file-contents-function' is
5412 non-nil, it is called instead of rereading visited file contents."
5414 ;; I admit it's odd to reverse the sense of the prefix argument, but
5415 ;; there is a lot of code out there which assumes that the first
5416 ;; argument should be t to avoid consulting the auto-save file, and
5417 ;; there's no straightforward way to encourage authors to notice a
5418 ;; reversal of the argument sense. So I'm just changing the user
5419 ;; interface, but leaving the programmatic interface the same.
5424 ignore-auto noconfirm)))
5430 buffer-auto-save-file-name
5435 buffer-auto-save-file-name
5436 buffer-file-name)))
5446 file-name)))
5448 ;; If file was backed up but has changed since,
5449 ;; we should make another backup.
5453 ;; Effectively copy the after-revert-hook status,
5454 ;; since after-find-file will clobber it.
5457 after-revert-hook))
5459 ;; FIXME: Throw away undo-log when preserve-modes is nil?
5463 file-name auto-save-p)
5464 ;; Recompute the truename in case changes in symlinks
5465 ;; have changed the truename.
5469 ;; Run after-revert-hook as it was before we reverted.
5473 local-hook)
5476 t)))))
5482 "File %s no longer exists!"
5484 file-name))
5487 "File %s no longer readable!"
5489 file-name))
5491 ;; Bind buffer-file-name to nil
5492 ;; so that we don't try to lock the file.
5498 ;; Auto-saved file should be read by Emacs's
5499 ;; internal coding.
5503 buffer-file-coding-system-explicit
5506 coding-system-for-read
5508 coding-system-for-read)
5510 ;; As a coding system suitable for multibyte
5511 ;; buffer is specified, make the current
5512 ;; buffer multibyte.
5515 ;; This force after-insert-file-set-coding
5516 ;; (called from insert-file-contents) to set
5517 ;; buffer-file-coding-system to a proper value.
5520 ;; Note that this preserves point in an intelligent way.
5524 nil nil t))
5526 nil nil t))))))
5529 "Recover the visited file--get contents from its last auto-save file."
5534 "Visit file FILE, but get contents from its last auto-save file."
5535 ;; Actually putting the file name in the minibuffer should be used
5536 ;; only rarely.
5537 ;; Not just because users often use the default.
5550 "*Directory*" nil
5561 ;; Use insert-directory-safely, not insert-directory,
5562 ;; because these files might not exist. In particular,
5563 ;; FILE might not exist if the auto-save file was for
5564 ;; a buffer that didn't visit a file, such as "*mail*".
5565 ;; The code in v20.x called `ls' directly, so we need
5566 ;; to emulate what `ls' did in that case.
5571 ;; Keep the current buffer-file-coding-system.
5573 ;; Auto-saved file should be read with special coding.
5582 "Recover auto save files from a previous Emacs session.
5583 This command first displays a Dired buffer showing you the
5584 previous sessions that you could recover from.
5585 To choose one, move point to the proper line and then type C-c C-c.
5586 Then you'll be asked about a number of files to recover."
5596 auto-save-list-file-prefix)))
5597 t)
5608 ;; Each line starts with a space
5609 ;; so that Font Lock mode won't highlight the first character.
5612 " To delete a session file, type \
5618 "Choose one saved session to recover auto-save files from.
5619 This command is used in the special Dired buffer created by
5622 ;; Get the name of the session file to recover from.
5624 files
5630 ;; Read in the auto-save-list file.
5633 ;; Loop thru the text of that file
5634 ;; and get out the names of the files to recover.
5638 ;; This is a pair of lines for a non-file-visiting buffer.
5639 ;; Get the auto-save file name and manufacture
5640 ;; a "visited file name" from that.
5643 ;; If there is no auto-save file name, the
5644 ;; auto-save-list file is probably corrupted.
5657 ;; This pair of lines is a file-visiting
5658 ;; buffer. Use the visited file name.
5668 ;; Ignore a file if its auto-save file does not exist now.
5672 ;; The file contains a pair of line for each auto-saved buffer.
5673 ;; The first line of the pair contains the visited file name
5674 ;; or is empty if the buffer was not visiting a file.
5675 ;; The second line is the auto-save file name.
5683 files
5689 "Kill BUFFER if confirmed."
5697 "Kill some buffers. Asks the user whether to kill each one of them.
5698 Non-interactively, if optional argument LIST is non-nil, it
5699 specifies the list of buffers to kill, asking for approval for each one."
5707 ; if we killed the base buffer.
5714 "Kill buffers whose name matches the specified REGEXP.
5715 The optional second argument indicates whether to kill internal buffers too."
5724 \f
5726 "Adjust current buffer's auto save file name for current conditions.
5727 Also rename any existing auto save file, if it was made in this session."
5739 "Return file name to use for auto-saves of current buffer.
5740 Does not consider `auto-save-visited-file-name' as that variable is checked
5741 before calling this function. You can redefine this for customization.
5742 See also `auto-save-file-name-p'."
5750 result uniq)
5751 ;; Apply user-specified translations
5752 ;; to the file name.
5756 filename)
5766 filename))))
5771 ;; We truncate the file name to DOS 8+3 limits
5772 ;; before doing anything else, because the regexp
5773 ;; passed to string-match below cannot handle
5774 ;; extensions longer than 3 characters, multiple
5775 ;; dots, and other atrocities.
5780 fn)
5785 "#"
5788 ;; Make sure auto-save file names don't contain characters
5789 ;; invalid for the underlying filesystem.
5791 ;; Don't modify remote (ange-ftp) filenames
5794 result))))
5796 ;; Deal with buffers that don't have any associated files. (Mail
5797 ;; mode tends to create a good number of these.)
5801 file-name)
5802 ;; Restrict the characters used in the file name to those which
5803 ;; are known to be safe on all filesystems, url-encoding the
5804 ;; rest.
5805 ;; We do this on all platforms, because even if we are not
5806 ;; running on DOS/Windows, the current directory may be on a
5807 ;; mounted VFAT filesystem, such as a USB memory stick.
5811 ;; For multibyte characters, this will produce more than
5812 ;; 2 hex digits, so is not true URL encoding.
5816 ;; Generate the file name.
5822 ;; Try a few alternative directories, to get one we can
5823 ;; write it.
5829 ;; Don't modify remote (ange-ftp) filenames
5831 ;; The call to convert-standard-filename is in case
5832 ;; buffer-name includes characters not allowed by the
5833 ;; DOS/Windows filesystems. make-temp-file writes to the
5834 ;; file it creates, so we must fix the file name _before_
5835 ;; make-temp-file is called.
5837 fname))
5839 ;; make-temp-file creates the file,
5840 ;; but we don't want it to exist until we do an auto-save.
5844 file-name)))
5847 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
5848 FILENAME should lack slashes. You can redefine this for customization."
5850 \f
5852 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
5853 The generated regexp will match a filename only if the filename
5854 matches that wildcard according to shell rules. Only wildcards known
5855 by `sh' are supported."
5857 ;; Copy the initial run of non-special characters.
5860 ;; If no special characters, we're almost done.
5864 j)
5866 result
5887 ;; Found "[^". Insert a `\0' character
5888 ;; (which cannot happen in a filename)
5889 ;; into the character class, so that `^'
5890 ;; is not the first character after `[',
5891 ;; and thus non-special in a regexp.
5896 ;; I don't think `]' can appear in a
5897 ;; character class in a wildcard, but
5898 ;; let's be general here.
5905 i
5918 ;; Shell wildcards should match the entire filename,
5919 ;; not its part. Make the regexp say so.
5921 \f
5924 "Switches for `list-directory' to pass to `ls' for brief listing."
5930 "Switches for `list-directory' to pass to `ls' for verbose listing."
5935 "Expand wildcard pattern PATTERN.
5936 This returns a list of file names which match the pattern.
5938 If PATTERN is written as an absolute file name,
5939 the values are absolute also.
5941 If PATTERN is written as a relative file name, it is interpreted
5942 relative to the current default directory, `default-directory'.
5943 The file names returned are normally also relative to the current
5944 default directory. However, if FULL is non-nil, they are absolute."
5948 ;; A list of all dirs that DIRPART specifies.
5949 ;; This can be more than one dir
5950 ;; if DIRPART contains wildcards.
5954 dirpart)))
5958 contents)
5964 ;; Filter out "." and ".."
5969 name))
5976 this-dir-contents)
5977 this-dir-contents)
5978 contents))))
5980 contents)))
5982 ;; Let Tramp know that `file-expand-wildcards' does not need an advice.
5986 "Display a list of files in or matching DIRNAME, a la `ls'.
5987 DIRNAME is globbed by the shell if necessary.
5988 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
5989 Actions controlled by variables `list-directory-brief-switches'
5990 and `list-directory-verbose-switches'."
5994 nil default-directory nil)
5995 pfx)))
5997 list-directory-brief-switches))
5998 buffer)
6010 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
6018 "Quote characters special to the shell in PATTERN, leave wildcards alone.
6020 PATTERN is assumed to represent a file-name wildcard suitable for the
6021 underlying filesystem. For Unix and GNU/Linux, each character from the
6023 the parts of the pattern which don't include wildcard characters are
6024 quoted with double quotes.
6027 on Windows), so PATTERN can use them to quote wildcard characters that
6028 need to be passed verbatim to shell commands."
6032 ;; DOS/Windows don't allow `"' in file names. So if the
6033 ;; argument has quotes, we can safely assume it is already
6034 ;; quoted by the caller.
6036 ;; We quote [&()#$'] in case their shell is a port of a
6037 ;; Unixy shell. We quote [,=+] because stock DOS and
6038 ;; Windows shells require that in some cases, such as
6039 ;; passing arguments to batch files that use positional
6040 ;; arguments like %1.
6042 pattern
6045 end)
6062 pattern))))
6069 "Program to get the amount of free space on a file system.
6070 We assume the output has the format of `df'.
6071 The value of this variable must be just a command name or file name;
6072 if you want to specify options, use `directory-free-space-args'.
6074 A value of nil disables this feature.
6076 If the function `file-system-info' is defined, it is always used in
6077 preference to the program given by this variable."
6083 "Options to use when running `directory-free-space-program'."
6088 "Return the amount of free space on directory DIR's file system.
6089 The return value is a string describing the amount of free
6090 space (normally, the number of free 1KB blocks).
6092 This function calls `file-system-info' if it is available, or
6093 invokes the program specified by `directory-free-space-program'
6094 and `directory-free-space-args'. If the system call or program
6095 is unsuccessful, or if DIR is a remote directory, this function
6096 returns nil."
6098 ;; Try to find the number of free blocks. Non-Posix systems don't
6099 ;; always have df, but might have an equivalent system call.
6108 ;; Avoid failure if the default directory does
6109 ;; not exist (Bug#2631, Bug#3911).
6113 nil t nil
6114 directory-free-space-args
6117 ;; Assume that the "available" column is before the
6118 ;; "capacity" column. Find the "%" and scan backward.
6122 "[[:space:]]+[^[:space:]]+%[^%]*$"
6129 ;; The following expression replaces `dired-move-to-filename-regexp'.
6133 ;; In some locales, month abbreviations are as short as 2 letters,
6134 ;; and they can be followed by ".".
6135 ;; In Breton, a month name can include a quote character.
6148 s "+"
6151 ;; Japanese MS-Windows ls-lisp has one-digit months, and
6152 ;; omits the Kanji characters after month and day-of-month.
6153 ;; On Mac OS X 10.3, the date format in East Asian locales is
6154 ;; day-of-month digits followed by month digits.
6160 ;; The "[0-9]" below requires the previous column to end in a digit.
6161 ;; This avoids recognizing `1 may 1997' as a date in the line:
6162 ;; -r--r--r-- 1 may 1997 1168 Oct 19 16:49 README
6164 ;; The "[BkKMGTPEZY]?" below supports "ls -alh" output.
6166 ;; For non-iso date formats, we add the ".*" in order to find
6167 ;; the last possible match. This avoids recognizing
6168 ;; `jservice 10 1024' as a date in the line:
6169 ;; drwxr-xr-x 3 jservice 10 1024 Jul 2 1997 esg-host
6171 ;; vc dired listings provide the state or blanks between file
6172 ;; permissions and date. The state is always surrounded by
6173 ;; parentheses:
6174 ;; -rw-r--r-- (modified) 2005-10-22 21:25 files.el
6175 ;; This is not supported yet.
6180 "Regular expression to match up to the file name in a directory listing.
6181 The default value is designed to recognize dates and times
6186 ;; insert-directory
6187 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
6188 ;; FULL-DIRECTORY-P is nil.
6189 ;; The single line of output must display FILE's name as it was
6190 ;; given, namely, an absolute path name.
6191 ;; - must insert exactly one line for each file if WILDCARD or
6192 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
6193 ;; before the file lines, plus optional text after the file lines.
6194 ;; Lines are delimited by "\n", so filenames containing "\n" are not
6195 ;; allowed.
6196 ;; File lines should display the basename.
6197 ;; - must be consistent with
6198 ;; - functions dired-move-to-filename, (these two define what a file line is)
6199 ;; dired-move-to-end-of-filename,
6200 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
6201 ;; dired-insert-headerline
6202 ;; dired-after-subdir-garbage (defines what a "total" line is)
6203 ;; - variable dired-subdir-regexp
6204 ;; - may be passed "--dired" as the first argument in SWITCHES.
6205 ;; Filename handlers might have to remove this switch if their
6206 ;; "ls" command does not support it.
6208 "Insert directory listing for FILE, formatted according to SWITCHES.
6209 Leaves point after the inserted text.
6210 SWITCHES may be a string of options, or a list of strings
6211 representing individual options.
6212 Optional third arg WILDCARD means treat FILE as shell wildcard.
6213 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
6214 switches do not contain `d', so that a full listing is expected.
6216 This works by running a directory listing program
6217 whose name is in the variable `insert-directory-program'.
6218 If WILDCARD, it also runs the shell specified by `shell-file-name'.
6220 When SWITCHES contains the long `--dired' option, this function
6221 treats it specially, for the sake of dired. However, the
6222 normally equivalent short `-D' option is just passed on to
6223 `insert-directory-program', as any other option."
6224 ;; We need the directory in order to find the right handler.
6229 wildcard full-directory-p)
6232 ;; Read the actual directory using `insert-directory-program'.
6233 ;; RESULT gets the status code.
6235 ;; putting text property `dired-filename, decode one
6236 ;; bunch by one to preserve that property.
6238 ;; This is to control encoding the arguments in call-process.
6242 default-file-name-coding-system))))
6245 ;; Run ls in the directory part of the file pattern
6246 ;; using the last component as argument.
6252 ;; NB since switches is passed to the shell, be
6253 ;; careful of malicious values, eg "-l;reboot".
6254 ;; See eg dired-safe-switches-p.
6256 shell-file-name nil t nil
6257 "-c"
6259 ""
6261 insert-directory-program
6262 " -d "
6264 switches
6266 " -- "
6267 ;; Quote some characters that have
6268 ;; special meanings in shells; but
6269 ;; don't quote the wildcards--we want
6270 ;; them to be special. We also
6271 ;; currently don't quote the quoting
6272 ;; characters in case people want to
6273 ;; use them explicitly to quote
6274 ;; wildcard characters.
6276 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
6277 ;; directory if FILE is a symbolic link.
6285 insert-directory-program nil t nil
6289 ;; Split the switches at any spaces so we can
6290 ;; pass separate options as separate args.
6292 ;; Avoid lossage if FILE starts with `-'.
6300 file))))))))
6302 ;; If we got "//DIRED//" in the output, it means we got a real
6303 ;; directory listing, even if `ls' returned nonzero.
6304 ;; So ignore any errors.
6317 ;; The first time ls returns an error,
6318 ;; find the version numbers of ls,
6319 ;; and set insert-directory-ls-version
6320 ;; to > if it is more than 5.2.1, < if it is less, nil if it
6321 ;; is equal or if the info cannot be obtained.
6322 ;; (That can mean it isn't GNU ls.)
6332 comparison)
6348 ;; For GNU ls versions 5.2.2 and up, ignore minor errors.
6352 ;; If `insert-directory-program' failed, signal an error.
6354 ;; Delete the error message it may have output.
6356 ;; On non-Posix systems, we cannot open a directory, so
6357 ;; don't even try, because that will always result in
6358 ;; the ubiquitous "Access denied". Instead, show the
6359 ;; command line so the user can try to guess what went wrong.
6364 insert-directory-program
6366 file result)
6367 ;; Unix. Access the file to get a suitable error.
6374 ;; The following overshoots by one line for an empty
6375 ;; directory listed with "--dired", but without "-a"
6376 ;; switch, where the ls output contains a
6377 ;; "//DIRED-OPTIONS//" line, but no "//DIRED//" line.
6378 ;; We take care of that case later.
6386 error-lines)
6387 ;; Find all the lines that are error messages,
6388 ;; and record the bounds of each one.
6395 ;; Now read the numeric positions of file names.
6402 error-lines))
6405 error-lines)))
6407 ;; End is followed by \n or by " -> ".
6409 ;; It seems that we can't trust ls's output as to
6410 ;; byte positions of filenames.
6416 ;; Take care of the case where the ls output contains a
6417 ;; "//DIRED-OPTIONS//"-line, but no "//DIRED//"-line
6418 ;; and we went one line too far back (see above).
6423 ;; Now decode what read if necessary.
6425 file-name-coding-system
6426 default-file-name-coding-system
6428 coding-no-eol
6429 val pos)
6433 ;; If no coding system is specified or detection is
6434 ;; requested, detect the coding.
6448 ;; Force no eol conversion on a file name, so
6449 ;; that CR is preserved.
6457 ;; Try to insert the amount of free space.
6460 ;; First find the line to put it on.
6464 ;; Replace "total" with "used", to avoid confusion.
6470 "Convert `ls --dired' file name position value POS to a buffer position.
6471 File name position values returned in ls --dired output
6472 count only stdout; they don't count the error messages sent to stderr.
6473 So this function converts to them to real buffer positions.
6474 ERROR-LINES is a list of buffer positions of error message lines,
6475 of the form (START END)."
6479 pos)
6483 "Insert directory listing for FILE, formatted according to SWITCHES.
6485 Like `insert-directory', but if FILE does not exist, it inserts a
6486 message to that effect instead of signaling an error."
6489 ;; Simulate the message printed by `ls'.
6493 "Functions to call with no arguments to query about killing Emacs.
6494 If any of these functions returns nil, killing Emacs is canceled.
6495 `save-buffers-kill-emacs' calls these functions, but `kill-emacs',
6499 "How to ask for confirmation when leaving Emacs.
6500 If nil, the default, don't ask at all. If the value is non-nil, it should
6501 be a predicate function; for example `yes-or-no-p'."
6510 "Offer to save each buffer, then kill this Emacs process.
6511 With prefix ARG, silently save all file-visiting buffers without asking.
6512 If there are active processes where `process-query-on-exit-flag'
6513 returns non-nil, asks whether processes should be killed.
6514 Runs the members of `kill-emacs-query-functions' in turn and stops
6515 if any returns nil. If `confirm-kill-emacs' is non-nil, calls it."
6524 ;; process-list is not defined on MSDOS.
6526 active)
6542 ;; Query the user for other things, perhaps.
6549 "Offer to save each buffer, then kill the current connection.
6550 If the current frame has no client, kill Emacs itself.
6552 With prefix ARG, silently save all file-visiting buffers, then kill.
6554 If emacsclient was started with a list of filenames to edit, then
6555 only these files will be asked to be saved."
6560 \f
6561 ;; We use /: as a prefix to "quote" a file name
6562 ;; so that magic file name handlers will not apply to it.
6566 file-name-handler-alist))
6568 ;; We depend on being the last handler on the list,
6569 ;; so that anything else which does need handling
6570 ;; has been handled already.
6571 ;; So it is safe for us to inhibit *all* magic file name handlers.
6580 default-directory))
6581 ;; Get a list of the indices of the args which are file names.
6584 ;; The first six are special because they
6585 ;; return a file name. We want to include the /:
6586 ;; in the return value.
6587 ;; So just avoid stripping it in the first place.
6594 ;; `identity' means just return the first arg
6595 ;; not stripped of its quoting.
6597 ;; `add' means add "/:" to the result.
6600 ;; `unquote-then-quote' means set buffer-file-name
6601 ;; temporarily to unquoted filename.
6603 ;; List the arguments which are filenames.
6611 ;; For all other operations, treat the first argument only
6612 ;; as the file name.
6614 method
6615 ;; Copy ARGUMENTS so we can replace elements in it.
6619 ;; Strip off the /: from the file names that have it.
6627 "/"
6633 (`insert-file-contents
6639 (`unquote-then-quote
6644 \f
6645 ;; Symbolic modes and read-file-modes.
6648 "Convert CHAR to a numeric bit-mask for extracting mode bits.
6649 CHAR is in [ugoa] and represents the category of users (Owner, Group,
6650 Others, or All) for whom to produce the mask.
6651 The bit-mask that is returned extracts from mode bits the access rights
6652 for the specified category of users."
6660 "Convert CHAR to a numeric value of mode bits.
6661 CHAR is in [rwxXstugo] and represents symbolic access permissions.
6662 If CHAR is in [Xugo], the value is taken from FROM (or 0 if omitted)."
6669 ;; Rights relative to the previous file modes.
6680 "Convert a symbolic mode string specification to an equivalent number.
6682 WHO-MASK is the bit-mask specifying the category of users to which to
6683 apply the access permissions. See `file-modes-char-to-who'.
6684 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6685 RIGHTS request to add, remove, or set permissions based on existing ones,
6692 char-right)
6699 num-rights
6703 op char-right)))
6704 num-rights))
6707 "Convert symbolic file modes to numeric file modes.
6708 MODES is the string to convert, it should match
6710 See Info node `(coreutils)File permissions' for more information on this
6711 notation.
6712 FROM (or 0 if nil) gives the mode bits on which to base permissions if
6713 MODES request to add, remove, or set permissions based on existing ones,
6727 num-who num-modes)
6730 num-modes)))
6733 "Read file modes in octal or symbolic notation and return its numeric value.
6734 PROMPT is used as the prompt, default to `File modes (octal or symbolic): '.
6735 ORIG-FILE is the name of a file on whose mode bits to base returned
6736 permissions if what user types requests to add, remove, or set permissions
6752 nil nil default)))
6761 ;; Trashcan handling.
6763 "Directory for `move-file-to-trash' to move files and directories to.
6764 This directory is only used when the function `system-move-file-to-trash'
6765 is not defined.
6766 Relative paths are interpreted relative to `default-directory'.
6767 If the value is nil, Emacs uses a freedesktop.org-style trashcan."
6777 "Move the file (or directory) named FILENAME to the trash.
6778 When `delete-by-moving-to-trash' is non-nil, this function is
6779 called by `delete-file' and `delete-directory' instead of
6780 deleting files outright.
6782 If the function `system-move-file-to-trash' is defined, call it
6783 with FILENAME as an argument.
6784 Otherwise, if `trash-directory' is non-nil, move FILENAME to that
6785 directory.
6786 Otherwise, trash FILENAME using the freedesktop.org conventions,
6787 like the GNOME, KDE and XFCE desktop environments. Emacs only
6791 ;; If `trash-directory' is non-nil, move the file there.
6795 trash-dir)))
6796 ;; We can't trash a parent directory of trash-directory.
6799 trash-dir filename))
6802 ;; Ensure that the trashed file-name is unique.
6809 ;; If `system-move-file-to-trash' is defined, use it.
6812 ;; Otherwise, use the freedesktop.org method, as specified at
6813 ;; http://freedesktop.org/wiki/Specifications/trash-spec
6824 ;; Check if we have permissions to delete.
6828 ;; The trashed file cannot be the trash dir or its parent.
6831 trash-files-dir filename))
6834 trash-info-dir filename))
6836 ;; Ensure that the trash directory exists; otherwise, create it.
6847 ;; Try to move to trash with .trashinfo undo information
6852 ;; Perform url-encoding on FN. For compatibility with
6853 ;; other programs (e.g. XFCE Thunar), allow literal "/"
6854 ;; for path separators.
6859 ?n ?o ?p ?q ?r ?s ?t ?u ?v ?w ?x ?y ?z ?A
6860 ?B ?C ?D ?E ?F ?G ?H ?I ?J ?K ?L ?M ?N ?O
6873 fn))
6878 ;; Attempt to make .trashinfo file, trying up to 5
6879 ;; times. The .trashinfo file is opened with O_EXCL,
6880 ;; as per trash-spec 0.7, even if that can be a problem
6881 ;; on old NFS versions...
6885 trash-files-dir))
6887 success info-fn)
6892 trash-info-dir))
6900 ;; Uniquify new-fn. (Some file managers do not
6901 ;; like Emacs-style backup file names---e.g. bug
6902 ;; 170956 in Konqueror bug tracker.)
6907 ;; Finally, try to move the file to the trashcan.
6911 \f
6936 ;;; files.el ends here