1 ;;; files.el --- file input and output commands for Emacs
3 ;; Copyright (C) 1985,86,87,92,93,94,95,96,97,98,99,2000,01,02,2003
4 ;;; Free Software Foundation, Inc.
8 ;; This file is part of GNU Emacs.
10 ;; GNU Emacs is free software; you can redistribute it and/or modify
11 ;; it under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
15 ;; GNU Emacs is distributed in the hope that it will be useful,
16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 ;; GNU General Public License for more details.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 ;; Defines most of Emacs's file- and directory-handling functions,
28 ;; including basic file visiting, backup generation, link handling,
29 ;; ITS-id version control, load- and write-hook handling, and the like.
34 "Backups of edited data files."
37 (defgroup find-file nil
42 (defcustom delete-auto-save-files t
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."
50 (defcustom directory-abbrev-alist
52 "*Alist of abbreviations for file directories.
53 A list of elements of the form (FROM . TO), each meaning to replace
54 FROM with TO when it appears in a directory name. This replacement is
55 done when setting up the default directory of a newly visited file.
56 *Every* FROM string should start with `^'.
58 Do not use `~' in the TO strings.
59 They should be ordinary absolute directory names.
61 Use this feature when you have directories which you normally refer to
62 via absolute symbolic links. Make TO the name of the link, and FROM
63 the name it is linked to."
64 :type
'(repeat (cons :format
"%v"
71 ;; Turn off backup files on VMS since it has version numbers.
72 (defcustom make-backup-files
(not (eq system-type
'vax-vms
))
73 "*Non-nil means make a backup of a file the first time it is saved.
74 This can be done by renaming the file or by copying.
76 Renaming means that Emacs renames the existing file so that it is a
77 backup file, then writes the buffer into a new file. Any other names
78 that the old file had will now refer to the backup file. The new file
79 is owned by you and its group is defaulted.
81 Copying means that Emacs copies the existing file into the backup
82 file, then writes the buffer on top of the existing file. Any other
83 names that the old file had will now refer to the new (edited) file.
84 The file's owner and group are unchanged.
86 The choice of renaming or copying is controlled by the variables
87 `backup-by-copying', `backup-by-copying-when-linked',
88 `backup-by-copying-when-mismatch' and
89 `backup-by-copying-when-privileged-mismatch'. See also `backup-inhibited'."
93 ;; Do this so that local variables based on the file name
94 ;; are not overridden by the major mode.
95 (defvar backup-inhibited nil
96 "Non-nil means don't make a backup, regardless of the other parameters.
97 This variable is intended for use by making it local to a buffer.
98 But it is local only if you make it local.")
99 (put 'backup-inhibited
'permanent-local t
)
101 (defcustom backup-by-copying nil
102 "*Non-nil means always use copying to create backup files.
103 See documentation of variable `make-backup-files'."
107 (defcustom backup-by-copying-when-linked nil
108 "*Non-nil means use copying to create backups for files with multiple names.
109 This causes the alternate names to refer to the latest version as edited.
110 This variable is relevant only if `backup-by-copying' is nil."
114 (defcustom backup-by-copying-when-mismatch nil
115 "*Non-nil means create backups by copying if this preserves owner or group.
116 Renaming may still be used (subject to control of other variables)
117 when it would not result in changing the owner or group of the file;
118 that is, for files which are owned by you and whose group matches
119 the default for a new file created there by you.
120 This variable is relevant only if `backup-by-copying' is nil."
124 (defcustom backup-by-copying-when-privileged-mismatch
200
125 "*Non-nil means create backups by copying to preserve a privileged owner.
126 Renaming may still be used (subject to control of other variables)
127 when it would not result in changing the owner of the file or if the owner
128 has a user id greater than the value of this variable. This is useful
129 when low-numbered uid's are used for special system users (such as root)
130 that must maintain ownership of certain files.
131 This variable is relevant only if `backup-by-copying' and
132 `backup-by-copying-when-mismatch' are nil."
133 :type
'(choice (const nil
) integer
)
136 (defvar backup-enable-predicate
'normal-backup-enable-predicate
137 "Predicate that looks at a file name and decides whether to make backups.
138 Called with an absolute file name as argument, it returns t to enable backup.")
140 (defcustom buffer-offer-save nil
141 "*Non-nil in a buffer means always offer to save buffer on exit.
142 Do so even if the buffer is not visiting a file.
143 Automatically local in all buffers."
146 (make-variable-buffer-local 'buffer-offer-save
)
148 (defcustom find-file-existing-other-name t
149 "*Non-nil means find a file under alternative names, in existing buffers.
150 This means if any existing buffer is visiting the file you want
151 under another name, you get the existing buffer instead of a new buffer."
155 (defcustom find-file-visit-truename nil
156 "*Non-nil means visit a file under its truename.
157 The truename of a file is found by chasing all links
158 both at the file level and at the levels of the containing directories."
162 (defcustom revert-without-query
164 "*Specify which files should be reverted without query.
165 The value is a list of regular expressions.
166 If the file name matches one of these regular expressions,
167 then `revert-buffer' reverts the file without querying
168 if the file has changed on disk and you have not edited the buffer."
169 :type
'(repeat regexp
)
172 (defvar buffer-file-number nil
173 "The device number and file number of the file visited in the current buffer.
174 The value is a list of the form (FILENUM DEVNUM).
175 This pair of numbers uniquely identifies the file.
176 If the buffer is visiting a new file, the value is nil.")
177 (make-variable-buffer-local 'buffer-file-number
)
178 (put 'buffer-file-number
'permanent-local t
)
180 (defvar buffer-file-numbers-unique
(not (memq system-type
'(windows-nt)))
181 "Non-nil means that buffer-file-number uniquely identifies files.")
183 (defvar buffer-file-read-only nil
184 "Non-nil if visited file was read-only when visited.")
185 (make-variable-buffer-local 'buffer-file-read-only
)
187 (defcustom temporary-file-directory
188 (file-name-as-directory
189 (cond ((memq system-type
'(ms-dos windows-nt
))
190 (or (getenv "TEMP") (getenv "TMPDIR") (getenv "TMP") "c:/temp"))
191 ((memq system-type
'(vax-vms axp-vms
))
192 (or (getenv "TMPDIR") (getenv "TMP") (getenv "TEMP") "SYS$SCRATCH:"))
194 (or (getenv "TMPDIR") (getenv "TMP") (getenv "TEMP") "/tmp"))))
195 "The directory for writing temporary files."
199 (defcustom small-temporary-file-directory
200 (if (eq system-type
'ms-dos
) (getenv "TMPDIR"))
201 "The directory for writing small temporary files.
202 If non-nil, this directory is used instead of `temporary-file-directory'
203 by programs that create small temporary files. This is for systems that
204 have fast storage with limited space, such as a RAM disk."
206 :type
'(choice (const nil
) directory
))
208 ;; The system null device. (Should reference NULL_DEVICE from C.)
209 (defvar null-device
"/dev/null" "The system null device.")
211 (defvar file-name-invalid-regexp
212 (cond ((and (eq system-type
'ms-dos
) (not (msdos-long-file-names)))
213 (concat "^\\([^A-Z[-`a-z]\\|..+\\)?:\\|" ; colon except after drive
214 "[+, ;=|<>\"?*]\\|\\[\\|\\]\\|" ; invalid characters
215 "[\000-\031]\\|" ; control characters
216 "\\(/\\.\\.?[^/]\\)\\|" ; leading dots
217 "\\(/[^/.]+\\.[^/.]*\\.\\)")) ; more than a single dot
218 ((memq system-type
'(ms-dos windows-nt cygwin
))
219 (concat "^\\([^A-Z[-`a-z]\\|..+\\)?:\\|" ; colon except after drive
220 "[|<>\"?*\000-\031]")) ; invalid characters
222 "Regexp recognizing file names which aren't allowed by the filesystem.")
224 (defcustom file-precious-flag nil
225 "*Non-nil means protect against I/O errors while saving files.
226 Some modes set this non-nil in particular buffers.
228 This feature works by writing the new contents into a temporary file
229 and then renaming the temporary file to replace the original.
230 In this way, any I/O error in writing leaves the original untouched,
231 and there is never any instant where the file is nonexistent.
233 Note that this feature forces backups to be made by copying.
234 Yet, at the same time, saving a precious file
235 breaks any hard links between it and other files."
239 (defcustom version-control nil
240 "*Control use of version numbers for backup files.
241 t means make numeric backup versions unconditionally.
242 nil means make them for files that have some already.
243 `never' means do not make them."
244 :type
'(choice (const :tag
"Never" never
)
245 (const :tag
"If existing" nil
)
246 (other :tag
"Always" t
))
250 (defcustom dired-kept-versions
2
251 "*When cleaning directory, number of versions to keep."
256 (defcustom delete-old-versions nil
257 "*If t, delete excess backup versions silently.
258 If nil, ask confirmation. Any other value prevents any trimming."
259 :type
'(choice (const :tag
"Delete" t
)
260 (const :tag
"Ask" nil
)
261 (other :tag
"Leave" other
))
264 (defcustom kept-old-versions
2
265 "*Number of oldest versions to keep when a new numbered backup is made."
269 (defcustom kept-new-versions
2
270 "*Number of newest versions to keep when a new numbered backup is made.
271 Includes the new backup. Must be > 0"
275 (defcustom require-final-newline nil
276 "*Value of t says silently ensure a file ends in a newline when it is saved.
277 Non-nil but not t says ask user whether to add a newline when there isn't one.
278 nil means don't add newlines."
279 :type
'(choice (const :tag
"Off" nil
)
281 (other :tag
"Ask" ask
))
282 :group
'editing-basics
)
284 (defcustom auto-save-default t
285 "*Non-nil says by default do auto-saving of every file-visiting buffer."
289 (defcustom auto-save-visited-file-name nil
290 "*Non-nil says auto-save a buffer in the file it is visiting, when practical.
291 Normally auto-save files are written under other names."
295 (defcustom auto-save-file-name-transforms
296 `(("\\`/[^/]*:\\(.+/\\)*\\(.*\\)"
297 ;; Don't put "\\2" inside expand-file-name, since it will be
298 ;; transformed to "/2" on DOS/Windows.
299 ,(concat temporary-file-directory
"\\2") t
))
300 "*Transforms to apply to buffer file name before making auto-save file name.
301 Each transform is a list (REGEXP REPLACEMENT UNIQUIFY):
302 REGEXP is a regular expression to match against the file name.
303 If it matches, `replace-match' is used to replace the
304 matching part with REPLACEMENT.
305 If the optional element UNIQUIFY is non-nil, the auto-save file name is
306 constructed by taking the directory part of the replaced file-name,
307 concatenated with the buffer file name with all directory separators
308 changed to `!' to prevent clashes. This will not work
309 correctly if your filesystem truncates the resulting name.
311 All the transforms in the list are tried, in the order they are listed.
312 When one transform applies, its result is final;
313 no further transforms are tried.
315 The default value is set up to put the auto-save file into the
316 temporary directory (see the variable `temporary-file-directory') for
317 editing a remote file.
319 On MS-DOS filesystems without long names this variable is always
322 :type
'(repeat (list (string :tag
"Regexp") (string :tag
"Replacement")
323 (boolean :tag
"Uniquify")))
326 (defcustom save-abbrevs t
327 "*Non-nil means save word abbrevs too when files are saved.
328 If `silently', don't ask the user before saving."
329 :type
'(choice (const t
) (const nil
) (const silently
))
332 (defcustom find-file-run-dired t
333 "*Non-nil means allow `find-file' to visit directories.
334 To visit the directory, `find-file' runs `find-directory-functions'."
338 (defcustom find-directory-functions
'(cvs-dired-noselect dired-noselect
)
339 "*List of functions to try in sequence to visit a directory.
340 Each function is called with the directory name as the sole argument
341 and should return either a buffer or nil."
342 :type
'(hook :options
(cvs-dired-noselect dired-noselect
))
345 ;;;It is not useful to make this a local variable.
346 ;;;(put 'find-file-not-found-hooks 'permanent-local t)
347 (defvar find-file-not-found-functions nil
348 "List of functions to be called for `find-file' on nonexistent file.
349 These functions are called as soon as the error is detected.
350 Variable `buffer-file-name' is already set up.
351 The functions are called in the order given until one of them returns non-nil.")
352 (defvaralias 'find-file-not-found-hooks
'find-file-not-found-functions
)
353 (make-obsolete-variable
354 'find-file-not-found-hooks
'find-file-not-found-functions
"21.4")
356 ;;;It is not useful to make this a local variable.
357 ;;;(put 'find-file-hooks 'permanent-local t)
358 (defcustom find-file-hook nil
359 "List of functions to be called after a buffer is loaded from a file.
360 The buffer's local variables (if any) will have been processed before the
361 functions are called."
364 :options
'(auto-insert)
366 (defvaralias 'find-file-hooks
'find-file-hook
)
367 (make-obsolete-variable 'find-file-hooks
'find-file-hook
"21.4")
369 (defvar write-file-functions nil
370 "List of functions to be called before writing out a buffer to a file.
371 If one of them returns non-nil, the file is considered already written
372 and the rest are not called.
373 These hooks are considered to pertain to the visited file.
374 So any buffer-local binding of this variable is discarded if you change
375 the visited file name with \\[set-visited-file-name], but not when you
376 change the major mode.
378 This hook is not run if any of the functions in
379 `write-contents-functions' returns non-nil. Both hooks pertain
380 to how to save a buffer to file, for instance, choosing a suitable
381 coding system and setting mode bits. (See Info
382 node `(elisp)Saving Buffers'.) To perform various checks or
383 updates before the buffer is saved, use `before-save-hook' .")
384 (put 'write-file-functions
'permanent-local t
)
385 (defvaralias 'write-file-hooks
'write-file-functions
)
386 (make-obsolete-variable 'write-file-hooks
'write-file-functions
"21.4")
388 (defvar local-write-file-hooks nil
)
389 (make-variable-buffer-local 'local-write-file-hooks
)
390 (put 'local-write-file-hooks
'permanent-local t
)
391 (make-obsolete-variable 'local-write-file-hooks
'write-file-functions
"21.4")
393 (defvar write-contents-functions nil
394 "List of functions to be called before writing out a buffer to a file.
395 If one of them returns non-nil, the file is considered already written
396 and the rest are not called.
398 This variable is meant to be used for hooks that pertain to the
399 buffer's contents, not to the particular visited file; thus,
400 `set-visited-file-name' does not clear this variable; but changing the
401 major mode does clear it.
403 For hooks that _do_ pertain to the particular visited file, use
404 `write-file-functions'. Both this variable and
405 `write-file-functions' relate to how a buffer is saved to file.
406 To perform various checks or updates before the buffer is saved,
407 use `before-save-hook'.")
408 (make-variable-buffer-local 'write-contents-functions
)
409 (defvaralias 'write-contents-hooks
'write-contents-functions
)
410 (make-obsolete-variable 'write-contents-hooks
'write-contents-functions
"21.4")
412 (defcustom enable-local-variables t
413 "*Control use of local variables in files you visit.
414 The value can be t, nil or something else.
415 A value of t means file local variables specifications are obeyed;
416 nil means they are ignored; anything else means query.
417 This variable also controls use of major modes specified in
420 The command \\[normal-mode], when used interactively,
421 always obeys file local variable specifications and the -*- line,
422 and ignores this variable."
423 :type
'(choice (const :tag
"Obey" t
)
424 (const :tag
"Ignore" nil
)
425 (other :tag
"Query" other
))
428 (defvar local-enable-local-variables t
429 "Like `enable-local-variables' but meant for buffer-local bindings.
430 The meaningful values are nil and non-nil. The default is non-nil.
431 If a major mode sets this to nil, buffer-locally, then any local
432 variables list in the file will be ignored.
434 This variable does not affect the use of major modes
435 specified in a -*- line.")
437 (defcustom enable-local-eval
'maybe
438 "*Control processing of the \"variable\" `eval' in a file's local variables.
439 The value can be t, nil or something else.
440 A value of t means obey `eval' variables;
441 nil means ignore them; anything else means query.
443 The command \\[normal-mode] always obeys local-variables lists
444 and ignores this variable."
445 :type
'(choice (const :tag
"Obey" t
)
446 (const :tag
"Ignore" nil
)
447 (other :tag
"Query" other
))
450 ;; Avoid losing in versions where CLASH_DETECTION is disabled.
451 (or (fboundp 'lock-buffer
)
452 (defalias 'lock-buffer
'ignore
))
453 (or (fboundp 'unlock-buffer
)
454 (defalias 'unlock-buffer
'ignore
))
455 (or (fboundp 'file-locked-p
)
456 (defalias 'file-locked-p
'ignore
))
458 (defcustom view-read-only nil
459 "*Non-nil means buffers visiting files read-only do so in view mode.
460 In fact, this means that all read-only buffers normally have
461 View mode enabled, including buffers that are read-only because
462 you visit a file you cannot alter, and buffers you make read-only
463 using \\[toggle-read-only]."
467 (put 'ange-ftp-completion-hook-function
'safe-magic t
)
468 (defun ange-ftp-completion-hook-function (op &rest args
)
469 "Provides support for ange-ftp host name completion.
470 Runs the usual ange-ftp hook, but only for completion operations."
471 ;; Having this here avoids the need to load ange-ftp when it's not
473 (if (memq op
'(file-name-completion file-name-all-completions
))
474 (apply 'ange-ftp-hook-function op args
)
475 (let ((inhibit-file-name-handlers
476 (cons 'ange-ftp-completion-hook-function
477 (and (eq inhibit-file-name-operation op
)
478 inhibit-file-name-handlers
)))
479 (inhibit-file-name-operation op
))
482 (defun convert-standard-filename (filename)
483 "Convert a standard file's name to something suitable for the current OS.
484 This function's standard definition is trivial; it just returns the argument.
485 However, on some systems, the function is redefined with a definition
486 that really does change some file names to canonicalize certain
487 patterns and to guarantee valid names."
490 (defun read-directory-name (prompt &optional dir default-dirname mustmatch initial
)
491 "Read directory name, prompting with PROMPT and completing in directory DIR.
492 Value is not expanded---you must call `expand-file-name' yourself.
493 Default name to DEFAULT-DIRNAME if user exits with the same
494 non-empty string that was inserted by this function.
495 (If DEFAULT-DIRNAME is omitted, the current buffer's directory is used,
496 except that if INITIAL is specified, that combined with DIR is used.)
497 If the user exits with an empty minibuffer, this function returns
498 an empty string. (This can only happen if the user erased the
499 pre-inserted contents or if `insert-default-directory' is nil.)
500 Fourth arg MUSTMATCH non-nil means require existing directory's name.
501 Non-nil and non-t means also require confirmation after completion.
502 Fifth arg INITIAL specifies text to start with.
503 DIR should be an absolute directory name. It defaults to
504 the value of `default-directory'."
506 (setq dir default-directory
))
507 (unless default-dirname
508 (setq default-dirname
509 (if initial
(concat dir initial
) default-directory
)))
510 (read-file-name prompt dir default-dirname mustmatch initial
515 "Show the current default directory."
517 (message "Directory %s" default-directory
))
520 "Value of the CDPATH environment variable, as a list.
521 Not actually set up until the first time you use it.")
523 (defun parse-colon-path (cd-path)
524 "Explode a colon-separated search path into a list of directory names.
525 \(For values of `colon' equal to `path-separator'.)"
526 ;; We could use split-string here.
528 (let (cd-list (cd-start 0) cd-colon
)
529 (setq cd-path
(concat cd-path path-separator
))
530 (while (setq cd-colon
(string-match path-separator cd-path cd-start
))
533 (list (if (= cd-start cd-colon
)
535 (substitute-in-file-name
536 (file-name-as-directory
537 (substring cd-path cd-start cd-colon
)))))))
538 (setq cd-start
(+ cd-colon
1)))
541 (defun cd-absolute (dir)
542 "Change current directory to given absolute file name DIR."
543 ;; Put the name into directory syntax now,
544 ;; because otherwise expand-file-name may give some bad results.
545 (if (not (eq system-type
'vax-vms
))
546 (setq dir
(file-name-as-directory dir
)))
547 (setq dir
(abbreviate-file-name (expand-file-name dir
)))
548 (if (not (file-directory-p dir
))
549 (if (file-exists-p dir
)
550 (error "%s is not a directory" dir
)
551 (error "%s: no such directory" dir
))
552 (if (file-executable-p dir
)
553 (setq default-directory dir
)
554 (error "Cannot cd to %s: Permission denied" dir
))))
557 "Make DIR become the current buffer's default directory.
558 If your environment includes a `CDPATH' variable, try each one of that
559 colon-separated list of directories when resolving a relative directory name."
561 (list (read-directory-name "Change default directory: "
562 default-directory default-directory
563 (and (member cd-path
'(nil ("./")))
564 (null (getenv "CDPATH"))))))
565 (if (file-name-absolute-p dir
)
566 (cd-absolute (expand-file-name dir
))
568 (let ((trypath (parse-colon-path (getenv "CDPATH"))))
569 (setq cd-path
(or trypath
(list "./")))))
570 (if (not (catch 'found
572 (function (lambda (x)
573 (let ((f (expand-file-name (concat x dir
))))
574 (if (file-directory-p f
)
577 (throw 'found t
))))))
580 (error "No such directory found via CDPATH environment variable"))))
582 (defun load-file (file)
583 "Load the Lisp file named FILE."
584 ;; This is a case where .elc makes a lot of sense.
585 (interactive (list (let ((completion-ignored-extensions
586 (remove ".elc" completion-ignored-extensions
)))
587 (read-file-name "Load file: "))))
588 (load (expand-file-name file
) nil nil t
))
590 (defun locate-file (filename path
&optional suffixes predicate
)
591 "Search for FILENAME through PATH.
592 If SUFFIXES is non-nil, it should be a list of suffixes to append to
593 file name when searching. If SUFFIXES is nil, it is equivalent to '(\"\").
594 If non-nil, PREDICATE is used instead of `file-readable-p'.
595 PREDICATE can also be an integer to pass to the `access' system call,
596 in which case file-name handlers are ignored. This usage is deprecated.
598 For compatibility, PREDICATE can also be one of the symbols
599 `executable', `readable', `writable', or `exists', or a list of
600 one or more of those symbols."
601 (if (and predicate
(symbolp predicate
) (not (functionp predicate
)))
602 (setq predicate
(list predicate
)))
603 (when (and (consp predicate
) (not (functionp predicate
)))
605 (logior (if (memq 'executable predicate
) 1 0)
606 (if (memq 'writable predicate
) 2 0)
607 (if (memq 'readable predicate
) 4 0))))
608 (locate-file-internal filename path suffixes predicate
))
610 (defun locate-file-completion (string path-and-suffixes action
)
611 "Do completion for file names passed to `locate-file'.
612 PATH-AND-SUFFIXES is a pair of lists (DIRECTORIES . SUFFIXES)."
613 (if (file-name-absolute-p string
)
614 (read-file-name-internal string nil action
)
616 (suffix (concat (regexp-opt (cdr path-and-suffixes
) t
) "\\'"))
617 (string-dir (file-name-directory string
)))
618 (dolist (dir (car path-and-suffixes
))
619 (if string-dir
(setq dir
(expand-file-name string-dir dir
)))
620 (when (file-directory-p dir
)
621 (dolist (file (file-name-all-completions
622 (file-name-nondirectory string
) dir
))
623 (push (if string-dir
(concat string-dir file
) file
) names
)
624 (when (string-match suffix file
)
625 (setq file
(substring file
0 (match-beginning 0)))
626 (push (if string-dir
(concat string-dir file
) file
) names
)))))
628 ((eq action t
) (all-completions string names
))
629 ((null action
) (try-completion string names
))
630 (t (test-completion string names
))))))
632 (defun load-library (library)
633 "Load the library named LIBRARY.
634 This is an interface to the function `load'."
636 (list (completing-read "Load library: "
637 'locate-file-completion
638 (cons load-path load-suffixes
))))
641 (defun file-remote-p (file)
642 "Test whether FILE specifies a location on a remote system."
643 (let ((handler (find-file-name-handler file
'file-local-copy
)))
645 (get handler
'file-remote-p
))))
647 (defun file-local-copy (file)
648 "Copy the file FILE into a temporary file on this machine.
649 Returns the name of the local copy, or nil, if FILE is directly
651 ;; This formerly had an optional BUFFER argument that wasn't used by
653 (let ((handler (find-file-name-handler file
'file-local-copy
)))
655 (funcall handler
'file-local-copy file
)
658 (defun file-truename (filename &optional counter prev-dirs
)
659 "Return the truename of FILENAME, which should be absolute.
660 The truename of a file name is found by chasing symbolic links
661 both at the level of the file and at the level of the directories
662 containing it, until no links are left at any level.
664 The arguments COUNTER and PREV-DIRS are used only in recursive calls.
665 Do not specify them in other calls."
666 ;; COUNTER can be a cons cell whose car is the count of how many more links
667 ;; to chase before getting an error.
668 ;; PREV-DIRS can be a cons cell whose car is an alist
669 ;; of truenames we've just recently computed.
671 ;; The last test looks dubious, maybe `+' is meant here? --simon.
672 (if (or (string= filename
"") (string= filename
"~")
673 (and (string= (substring filename
0 1) "~")
674 (string-match "~[^/]*" filename
)))
676 (setq filename
(expand-file-name filename
))
677 (if (string= filename
"")
678 (setq filename
"/"))))
679 (or counter
(setq counter
(list 100)))
681 ;; For speed, remove the ange-ftp completion handler from the list.
682 ;; We know it's not needed here.
683 ;; For even more speed, do this only on the outermost call.
684 (file-name-handler-alist
685 (if prev-dirs file-name-handler-alist
686 (let ((tem (copy-sequence file-name-handler-alist
)))
687 (delq (rassq 'ange-ftp-completion-hook-function tem
) tem
)))))
688 (or prev-dirs
(setq prev-dirs
(list nil
)))
690 ;; andrewi@harlequin.co.uk - none of the following code (except for
691 ;; invoking the file-name handler) currently applies on Windows
692 ;; (ie. there are no native symlinks), but there is an issue with
693 ;; case differences being ignored by the OS, and short "8.3 DOS"
694 ;; name aliases existing for all files. (The short names are not
695 ;; reported by directory-files, but can be used to refer to files.)
696 ;; It seems appropriate for file-truename to resolve these issues in
697 ;; the most natural way, which on Windows is to call the function
698 ;; `w32-long-file-name' - this returns the exact name of a file as
699 ;; it is stored on disk (expanding short name aliases with the full
700 ;; name in the process).
701 (if (eq system-type
'windows-nt
)
702 (let ((handler (find-file-name-handler filename
'file-truename
)))
703 ;; For file name that has a special handler, call handler.
704 ;; This is so that ange-ftp can save time by doing a no-op.
706 (setq filename
(funcall handler
'file-truename filename
))
707 ;; If filename contains a wildcard, newname will be the old name.
708 (unless (string-match "[[*?]" filename
)
709 ;; If filename exists, use the long name
710 (setq filename
(or (w32-long-file-name filename
) filename
))))
713 ;; If this file directly leads to a link, process that iteratively
714 ;; so that we don't use lots of stack.
716 (setcar counter
(1- (car counter
)))
717 (if (< (car counter
) 0)
718 (error "Apparent cycle of symbolic links for %s" filename
))
719 (let ((handler (find-file-name-handler filename
'file-truename
)))
720 ;; For file name that has a special handler, call handler.
721 ;; This is so that ange-ftp can save time by doing a no-op.
723 (setq filename
(funcall handler
'file-truename filename
)
725 (let ((dir (or (file-name-directory filename
) default-directory
))
727 ;; Get the truename of the directory.
728 (setq dirfile
(directory-file-name dir
))
729 ;; If these are equal, we have the (or a) root directory.
730 (or (string= dir dirfile
)
731 ;; If this is the same dir we last got the truename for,
732 ;; save time--don't recalculate.
733 (if (assoc dir
(car prev-dirs
))
734 (setq dir
(cdr (assoc dir
(car prev-dirs
))))
736 (new (file-name-as-directory (file-truename dirfile counter prev-dirs
))))
737 (setcar prev-dirs
(cons (cons old new
) (car prev-dirs
)))
739 (if (equal ".." (file-name-nondirectory filename
))
741 (directory-file-name (file-name-directory (directory-file-name dir
)))
743 (if (equal "." (file-name-nondirectory filename
))
744 (setq filename
(directory-file-name dir
)
746 ;; Put it back on the file name.
747 (setq filename
(concat dir
(file-name-nondirectory filename
)))
748 ;; Is the file name the name of a link?
749 (setq target
(file-symlink-p filename
))
751 ;; Yes => chase that link, then start all over
752 ;; since the link may point to a directory name that uses links.
753 ;; We can't safely use expand-file-name here
754 ;; since target might look like foo/../bar where foo
755 ;; is itself a link. Instead, we handle . and .. above.
757 (if (file-name-absolute-p target
)
765 (defun file-chase-links (filename &optional limit
)
766 "Chase links in FILENAME until a name that is not a link.
767 Unlike `file-truename', this does not check whether a parent
768 directory name is a symbolic link.
769 If the optional argument LIMIT is a number,
770 it means chase no more than that many links and then stop."
771 (let (tem (newname filename
)
773 (while (and (or (null limit
) (< count limit
))
774 (setq tem
(file-symlink-p newname
)))
776 (if (and (null limit
) (= count
100))
777 (error "Apparent cycle of symbolic links for %s" filename
))
778 ;; In the context of a link, `//' doesn't mean what Emacs thinks.
779 (while (string-match "//+" tem
)
780 (setq tem
(replace-match "/" nil nil tem
)))
781 ;; Handle `..' by hand, since it needs to work in the
782 ;; target of any directory symlink.
783 ;; This code is not quite complete; it does not handle
784 ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose.
785 (while (string-match "\\`\\.\\./" tem
)
786 (setq tem
(substring tem
3))
787 (setq newname
(expand-file-name newname
))
788 ;; Chase links in the default dir of the symlink.
791 (directory-file-name (file-name-directory newname
))))
792 ;; Now find the parent of that dir.
793 (setq newname
(file-name-directory newname
)))
794 (setq newname
(expand-file-name tem
(file-name-directory newname
)))
795 (setq count
(1+ count
))))
798 (defun recode-file-name (file coding new-coding
&optional ok-if-already-exists
)
799 "Change the encoding of FILE's name from CODING to NEW-CODING.
800 The value is a new name of FILE.
801 Signals a `file-already-exists' error if a file of the new name
802 already exists unless optional third argument OK-IF-ALREADY-EXISTS
803 is non-nil. A number as third arg means request confirmation if
804 the new name already exists. This is what happens in interactive
807 (let ((default-coding (or file-name-coding-system
808 default-file-name-coding-system
))
809 (filename (read-file-name "Recode filename: " nil nil t
))
810 from-coding to-coding
)
811 (if (and default-coding
812 ;; We provide the default coding only when it seems that
813 ;; the filename is correctly decoded by the default
815 (let ((charsets (find-charset-string filename
)))
816 (and (not (memq 'eight-bit-control charsets
))
817 (not (memq 'eight-bit-graphic charsets
)))))
818 (setq from-coding
(read-coding-system
819 (format "Recode filename %s from (default %s): "
820 filename default-coding
)
822 (setq from-coding
(read-coding-system
823 (format "Recode filename %s from: " filename
))))
825 ;; We provide the default coding only when a user is going to
826 ;; change the encoding not from the default coding.
827 (if (eq from-coding default-coding
)
828 (setq to-coding
(read-coding-system
829 (format "Recode filename %s from %s to: "
830 filename from-coding
)))
831 (setq to-coding
(read-coding-system
832 (format "Recode filename %s from %s to (default %s): "
833 filename from-coding default-coding
)
835 (list filename from-coding to-coding
)))
837 (let* ((default-coding (or file-name-coding-system
838 default-file-name-coding-system
))
839 ;; FILE should have been decoded by DEFAULT-CODING.
840 (encoded (encode-coding-string file default-coding
))
841 (newname (decode-coding-string encoded coding
))
842 (new-encoded (encode-coding-string newname new-coding
))
843 ;; Suppress further encoding.
844 (file-name-coding-system nil
)
845 (default-file-name-coding-system nil
)
846 (locale-coding-system nil
))
847 (rename-file encoded new-encoded ok-if-already-exists
)
850 (defun switch-to-buffer-other-window (buffer &optional norecord
)
851 "Select buffer BUFFER in another window.
852 Optional second arg NORECORD non-nil means
853 do not put this buffer at the front of the list of recently selected ones.
855 This uses the function `display-buffer' as a subroutine; see its
856 documentation for additional customization information."
857 (interactive "BSwitch to buffer in other window: ")
858 (let ((pop-up-windows t
)
859 ;; Don't let these interfere.
860 same-window-buffer-names same-window-regexps
)
861 (pop-to-buffer buffer t norecord
)))
863 (defun switch-to-buffer-other-frame (buffer &optional norecord
)
864 "Switch to buffer BUFFER in another frame.
865 Optional second arg NORECORD non-nil means
866 do not put this buffer at the front of the list of recently selected ones.
868 This uses the function `display-buffer' as a subroutine; see its
869 documentation for additional customization information."
870 (interactive "BSwitch to buffer in other frame: ")
871 (let ((pop-up-frames t
)
872 same-window-buffer-names same-window-regexps
)
873 (pop-to-buffer buffer t norecord
)
874 (raise-frame (window-frame (selected-window)))))
876 (defvar find-file-default nil
877 "Used within `find-file-read-args'.")
879 (defun find-file-read-args (prompt mustmatch
)
880 (list (let ((find-file-default
881 (and buffer-file-name
882 (abbreviate-file-name buffer-file-name
)))
885 (setq minibuffer-default find-file-default
)
886 ;; Clear out this hook so it does not interfere
887 ;; with any recursive minibuffer usage.
888 (pop minibuffer-setup-hook
)))
889 (minibuffer-setup-hook
890 minibuffer-setup-hook
))
891 (add-hook 'minibuffer-setup-hook munge-default-fun
)
892 (read-file-name prompt nil default-directory mustmatch
))
895 (defun find-file (filename &optional wildcards
)
897 Switch to a buffer visiting file FILENAME,
898 creating one if none already exists.
899 Interactively, the default if you just type RET is the current directory,
900 but the visited file name is available through the minibuffer history:
901 type M-n to pull it into the minibuffer.
903 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
904 expand wildcards (if any) and visit multiple files. Wildcard expansion
905 can be suppressed by setting `find-file-wildcards'."
907 (find-file-read-args "Find file: " nil
))
908 (let ((value (find-file-noselect filename nil nil wildcards
)))
910 (mapcar 'switch-to-buffer
(nreverse value
))
911 (switch-to-buffer value
))))
913 (defun find-file-other-window (filename &optional wildcards
)
914 "Edit file FILENAME, in another window.
915 May create a new window, or reuse an existing one.
916 See the function `display-buffer'.
918 Interactively, the default if you just type RET is the current directory,
919 but the visited file name is available through the minibuffer history:
920 type M-n to pull it into the minibuffer.
922 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
923 expand wildcards (if any) and visit multiple files."
924 (interactive (find-file-read-args "Find file in other window: " nil
))
925 (let ((value (find-file-noselect filename nil nil wildcards
)))
928 (setq value
(nreverse value
))
929 (switch-to-buffer-other-window (car value
))
930 (mapcar 'switch-to-buffer
(cdr value
)))
931 (switch-to-buffer-other-window value
))))
933 (defun find-file-other-frame (filename &optional wildcards
)
934 "Edit file FILENAME, in another frame.
935 May create a new frame, or reuse an existing one.
936 See the function `display-buffer'.
938 Interactively, the default if you just type RET is the current directory,
939 but the visited file name is available through the minibuffer history:
940 type M-n to pull it into the minibuffer.
942 Interactively, or if WILDCARDS is non-nil in a call from Lisp,
943 expand wildcards (if any) and visit multiple files."
944 (interactive (find-file-read-args "Find file in other frame: " nil
))
945 (let ((value (find-file-noselect filename nil nil wildcards
)))
948 (setq value
(nreverse value
))
949 (switch-to-buffer-other-frame (car value
))
950 (mapcar 'switch-to-buffer
(cdr value
)))
951 (switch-to-buffer-other-frame value
))))
953 (defun find-file-read-only (filename &optional wildcards
)
954 "Edit file FILENAME but don't allow changes.
955 Like \\[find-file] but marks buffer as read-only.
956 Use \\[toggle-read-only] to permit editing."
957 (interactive (find-file-read-args "Find file read-only: " t
))
958 (unless (file-exists-p filename
) (error "%s does not exist" filename
))
959 (find-file filename wildcards
)
963 (defun find-file-read-only-other-window (filename &optional wildcards
)
964 "Edit file FILENAME in another window but don't allow changes.
965 Like \\[find-file-other-window] but marks buffer as read-only.
966 Use \\[toggle-read-only] to permit editing."
967 (interactive (find-file-read-args "Find file read-only other window: " t
))
968 (unless (file-exists-p filename
) (error "%s does not exist" filename
))
969 (find-file-other-window filename wildcards
)
973 (defun find-file-read-only-other-frame (filename &optional wildcards
)
974 "Edit file FILENAME in another frame but don't allow changes.
975 Like \\[find-file-other-frame] but marks buffer as read-only.
976 Use \\[toggle-read-only] to permit editing."
977 (interactive (find-file-read-args "Find file read-only other frame: " t
))
978 (unless (file-exists-p filename
) (error "%s does not exist" filename
))
979 (find-file-other-frame filename wildcards
)
983 (defun find-alternate-file-other-window (filename)
984 "Find file FILENAME as a replacement for the file in the next window.
985 This command does not select that window."
987 (save-selected-window
989 (let ((file buffer-file-name
)
993 (setq file-name
(file-name-nondirectory file
)
994 file-dir
(file-name-directory file
)))
995 (list (read-file-name
996 "Find alternate file: " file-dir nil nil file-name
)))))
998 (find-file-other-window filename
)
999 (save-selected-window
1001 (find-alternate-file filename
))))
1003 (defun find-alternate-file (filename)
1004 "Find file FILENAME, select its buffer, kill previous buffer.
1005 If the current buffer now contains an empty file that you just visited
1006 \(presumably by mistake), use this command to visit the file you really want."
1008 (let ((file buffer-file-name
)
1012 (setq file-name
(file-name-nondirectory file
)
1013 file-dir
(file-name-directory file
)))
1014 (list (read-file-name
1015 "Find alternate file: " file-dir nil nil file-name
))))
1016 (unless (run-hook-with-args-until-failure 'kill-buffer-query-functions
)
1018 (when (and (buffer-modified-p) (buffer-file-name))
1019 (if (yes-or-no-p (format "Buffer %s is modified; save it first? "
1022 (unless (yes-or-no-p "Kill and replace the buffer without saving it? ")
1023 (error "Aborted"))))
1024 (let ((obuf (current-buffer))
1025 (ofile buffer-file-name
)
1026 (onum buffer-file-number
)
1027 (odir dired-directory
)
1028 (otrue buffer-file-truename
)
1029 (oname (buffer-name)))
1030 (if (get-buffer " **lose**")
1031 (kill-buffer " **lose**"))
1032 (rename-buffer " **lose**")
1036 ;; This prevents us from finding the same buffer
1037 ;; if we specified the same file again.
1038 (setq buffer-file-name nil
)
1039 (setq buffer-file-number nil
)
1040 (setq buffer-file-truename nil
)
1041 ;; Likewise for dired buffers.
1042 (setq dired-directory nil
)
1043 (find-file filename
))
1044 (when (eq obuf
(current-buffer))
1045 ;; This executes if find-file gets an error
1046 ;; and does not really find anything.
1047 ;; We put things back as they were.
1048 ;; If find-file actually finds something, we kill obuf below.
1049 (setq buffer-file-name ofile
)
1050 (setq buffer-file-number onum
)
1051 (setq buffer-file-truename otrue
)
1052 (setq dired-directory odir
)
1054 (rename-buffer oname
)))
1055 (unless (eq (current-buffer) obuf
)
1056 (with-current-buffer obuf
1057 ;; We already asked; don't ask again.
1058 (let ((kill-buffer-query-functions))
1059 (kill-buffer obuf
))))))
1061 (defun create-file-buffer (filename)
1062 "Create a suitably named buffer for visiting FILENAME, and return it.
1063 FILENAME (sans directory) is used unchanged if that name is free;
1064 otherwise a string <2> or <3> or ... is appended to get an unused name."
1065 (let ((lastname (file-name-nondirectory filename
)))
1066 (if (string= lastname
"")
1067 (setq lastname filename
))
1068 (generate-new-buffer lastname
)))
1070 (defun generate-new-buffer (name)
1071 "Create and return a buffer with a name based on NAME.
1072 Choose the buffer's name using `generate-new-buffer-name'."
1073 (get-buffer-create (generate-new-buffer-name name
)))
1075 (defcustom automount-dir-prefix
"^/tmp_mnt/"
1076 "Regexp to match the automounter prefix in a directory name."
1080 (defvar abbreviated-home-dir nil
1081 "The user's homedir abbreviated according to `directory-abbrev-alist'.")
1083 (defun abbreviate-file-name (filename)
1084 "Return a version of FILENAME shortened using `directory-abbrev-alist'.
1085 This also substitutes \"~\" for the user's home directory and
1086 removes automounter prefixes (see the variable `automount-dir-prefix')."
1087 ;; Get rid of the prefixes added by the automounter.
1088 (if (and automount-dir-prefix
1089 (string-match automount-dir-prefix filename
)
1090 (file-exists-p (file-name-directory
1091 (substring filename
(1- (match-end 0))))))
1092 (setq filename
(substring filename
(1- (match-end 0)))))
1093 (let ((tail directory-abbrev-alist
))
1094 ;; If any elt of directory-abbrev-alist matches this name,
1095 ;; abbreviate accordingly.
1097 (if (string-match (car (car tail
)) filename
)
1099 (concat (cdr (car tail
)) (substring filename
(match-end 0)))))
1100 (setq tail
(cdr tail
)))
1101 ;; Compute and save the abbreviated homedir name.
1102 ;; We defer computing this until the first time it's needed, to
1103 ;; give time for directory-abbrev-alist to be set properly.
1104 ;; We include a slash at the end, to avoid spurious matches
1105 ;; such as `/usr/foobar' when the home dir is `/usr/foo'.
1106 (or abbreviated-home-dir
1107 (setq abbreviated-home-dir
1108 (let ((abbreviated-home-dir "$foo"))
1109 (concat "^" (abbreviate-file-name (expand-file-name "~"))
1112 ;; If FILENAME starts with the abbreviated homedir,
1113 ;; make it start with `~' instead.
1114 (if (and (string-match abbreviated-home-dir filename
)
1115 ;; If the home dir is just /, don't change it.
1116 (not (and (= (match-end 0) 1)
1117 (= (aref filename
0) ?
/)))
1118 ;; MS-DOS root directories can come with a drive letter;
1119 ;; Novell Netware allows drive letters beyond `Z:'.
1120 (not (and (or (eq system-type
'ms-dos
)
1121 (eq system-type
'cygwin
)
1122 (eq system-type
'windows-nt
))
1124 (string-match "^[a-zA-`]:/$" filename
)))))
1127 (substring filename
(match-beginning 1) (match-end 1))
1128 (substring filename
(match-end 0)))))
1131 (defcustom find-file-not-true-dirname-list nil
1132 "*List of logical names for which visiting shouldn't save the true dirname.
1133 On VMS, when you visit a file using a logical name that searches a path,
1134 you may or may not want the visited file name to record the specific
1135 directory where the file was found. If you *do not* want that, add the logical
1136 name to this list as a string."
1137 :type
'(repeat (string :tag
"Name"))
1140 (defun find-buffer-visiting (filename &optional predicate
)
1141 "Return the buffer visiting file FILENAME (a string).
1142 This is like `get-file-buffer', except that it checks for any buffer
1143 visiting the same file, possibly under a different name.
1144 If PREDICATE is non-nil, only a buffer satisfying it can be returned.
1145 If there is no such live buffer, return nil."
1146 (let ((predicate (or predicate
#'identity
))
1147 (truename (abbreviate-file-name (file-truename filename
))))
1148 (or (let ((buf (get-file-buffer filename
)))
1149 (when (and buf
(funcall predicate buf
)) buf
))
1150 (let ((list (buffer-list)) found
)
1151 (while (and (not found
) list
)
1153 (set-buffer (car list
))
1154 (if (and buffer-file-name
1155 (string= buffer-file-truename truename
)
1156 (funcall predicate
(current-buffer)))
1157 (setq found
(car list
))))
1158 (setq list
(cdr list
)))
1160 (let* ((attributes (file-attributes truename
))
1161 (number (nthcdr 10 attributes
))
1162 (list (buffer-list)) found
)
1163 (and buffer-file-numbers-unique
1165 (while (and (not found
) list
)
1166 (with-current-buffer (car list
)
1167 (if (and buffer-file-name
1168 (equal buffer-file-number number
)
1169 ;; Verify this buffer's file number
1170 ;; still belongs to its file.
1171 (file-exists-p buffer-file-name
)
1172 (equal (file-attributes buffer-file-truename
)
1174 (funcall predicate
(current-buffer)))
1175 (setq found
(car list
))))
1176 (setq list
(cdr list
))))
1179 (defcustom find-file-wildcards t
1180 "*Non-nil means file-visiting commands should handle wildcards.
1181 For example, if you specify `*.c', that would visit all the files
1182 whose names match the pattern."
1187 (defcustom find-file-suppress-same-file-warnings nil
1188 "*Non-nil means suppress warning messages for symlinked files.
1189 When nil, Emacs prints a warning when visiting a file that is already
1190 visited, but with a different name. Setting this option to t
1191 suppresses this warning."
1196 (defcustom large-file-warning-threshold
10000000
1197 "Maximum size of file above which a confirmation is requested.
1198 When nil, never request confirmation."
1201 :type
'(choice integer
(const :tag
"Never request confirmation" nil
)))
1203 (defun find-file-noselect (filename &optional nowarn rawfile wildcards
)
1204 "Read file FILENAME into a buffer and return the buffer.
1205 If a buffer exists visiting FILENAME, return that one, but
1206 verify that the file has not changed since visited or saved.
1207 The buffer is not selected, just returned to the caller.
1208 Optional first arg NOWARN non-nil means suppress any warning messages.
1209 Optional second arg RAWFILE non-nil means the file is read literally.
1210 Optional third arg WILDCARDS non-nil means do wildcard processing
1211 and visit all the matching files. When wildcards are actually
1212 used and expanded, the value is a list of buffers
1213 that are visiting the various files."
1215 (abbreviate-file-name
1216 (expand-file-name filename
)))
1217 (if (file-directory-p filename
)
1218 (or (and find-file-run-dired
1219 (run-hook-with-args-until-success
1220 'find-directory-functions
1221 (if find-file-visit-truename
1222 (abbreviate-file-name (file-truename filename
))
1224 (error "%s is a directory" filename
))
1227 (not (string-match "\\`/:" filename
))
1228 (string-match "[[*?]" filename
))
1229 (let ((files (condition-case nil
1230 (file-expand-wildcards filename t
)
1231 (error (list filename
))))
1232 (find-file-wildcards nil
))
1234 (find-file-noselect filename
)
1235 (mapcar #'find-file-noselect files
)))
1236 (let* ((buf (get-file-buffer filename
))
1237 (truename (abbreviate-file-name (file-truename filename
)))
1238 (attributes (file-attributes truename
))
1239 (number (nthcdr 10 attributes
))
1240 ;; Find any buffer for a file which has same truename.
1241 (other (and (not buf
) (find-buffer-visiting filename
))))
1242 ;; Let user know if there is a buffer with the same truename.
1246 find-file-suppress-same-file-warnings
1247 (string-equal filename
(buffer-file-name other
))
1248 (message "%s and %s are the same file"
1249 filename
(buffer-file-name other
)))
1250 ;; Optionally also find that buffer.
1251 (if (or find-file-existing-other-name find-file-visit-truename
)
1253 ;; Check to see if the file looks uncommonly large.
1254 (when (and large-file-warning-threshold
(nth 7 attributes
)
1255 ;; Don't ask again if we already have the file or
1256 ;; if we're asked to be quiet.
1257 (not (or buf nowarn
))
1258 (> (nth 7 attributes
) large-file-warning-threshold
)
1260 (format "File %s is large (%sMB), really open? "
1261 (file-name-nondirectory filename
)
1262 (/ (nth 7 attributes
) 1048576)))))
1265 ;; We are using an existing buffer.
1268 (verify-visited-file-modtime buf
)
1269 (cond ((not (file-exists-p filename
))
1270 (error "File %s no longer exists!" filename
))
1271 ;; Certain files should be reverted automatically
1272 ;; if they have changed on disk and not in the buffer.
1273 ((and (not (buffer-modified-p buf
))
1274 (let ((tail revert-without-query
)
1277 (if (string-match (car tail
) filename
)
1279 (setq tail
(cdr tail
)))
1281 (with-current-buffer buf
1282 (message "Reverting file %s..." filename
)
1284 (message "Reverting file %s...done" filename
)))
1286 (if (string= (file-name-nondirectory filename
)
1289 (if (buffer-modified-p buf
)
1290 "File %s changed on disk. Discard your edits? "
1291 "File %s changed on disk. Reread from disk? ")
1292 (file-name-nondirectory filename
))
1294 (if (buffer-modified-p buf
)
1295 "File %s changed on disk. Discard your edits in %s? "
1296 "File %s changed on disk. Reread from disk into %s? ")
1297 (file-name-nondirectory filename
)
1298 (buffer-name buf
))))
1299 (with-current-buffer buf
1300 (revert-buffer t t
)))))
1301 (with-current-buffer buf
1303 ;; Check if a formerly read-only file has become
1304 ;; writable and vice versa, but if the buffer agrees
1305 ;; with the new state of the file, that is ok too.
1306 (let ((read-only (not (file-writable-p buffer-file-name
))))
1307 (unless (or (eq read-only buffer-file-read-only
)
1308 (eq read-only buffer-read-only
))
1311 (format "File %s is %s on disk. Change buffer mode? "
1313 (if read-only
"read-only" "writable"))))
1314 (y-or-n-p question
)))
1315 (setq buffer-read-only read-only
)))
1316 (setq buffer-file-read-only read-only
))
1318 (when (and (not (eq (not (null rawfile
))
1319 (not (null find-file-literally
))))
1320 ;; It is confusing to ask whether to visit
1321 ;; non-literally if they have the file in
1323 (not (eq major-mode
'hexl-mode
)))
1324 (if (buffer-modified-p)
1325 (if (y-or-n-p (if rawfile
1326 "Save file and revisit literally? "
1327 "Save file and revisit non-literally? "))
1330 (find-file-noselect-1 buf filename nowarn
1331 rawfile truename number
))
1332 (if (y-or-n-p (if rawfile
1333 "Discard your edits and revisit file literally? "
1334 "Discard your edits and revisit file non-literally? "))
1335 (find-file-noselect-1 buf filename nowarn
1336 rawfile truename number
)
1337 (error (if rawfile
"File already visited non-literally"
1338 "File already visited literally"))))
1339 (if (y-or-n-p (if rawfile
1340 "Revisit file literally? "
1341 "Revisit file non-literally? "))
1342 (find-file-noselect-1 buf filename nowarn
1343 rawfile truename number
)
1344 (error (if rawfile
"File already visited non-literally"
1345 "File already visited literally"))))))
1346 ;; Return the buffer we are using.
1348 ;; Create a new buffer.
1349 (setq buf
(create-file-buffer filename
))
1350 (set-buffer-major-mode buf
)
1351 ;; find-file-noselect-1 may use a different buffer.
1352 (find-file-noselect-1 buf filename nowarn
1353 rawfile truename number
))))))
1355 (defun find-file-noselect-1 (buf filename nowarn rawfile truename number
)
1356 (let ((inhibit-read-only t
)
1358 (with-current-buffer buf
1359 (kill-local-variable 'find-file-literally
)
1360 ;; Needed in case we are re-visiting the file with a different
1361 ;; text representation.
1362 (kill-local-variable 'buffer-file-coding-system
)
1363 (kill-local-variable 'cursor-type
)
1365 (and (default-value 'enable-multibyte-characters
)
1367 (set-buffer-multibyte t
))
1370 (insert-file-contents-literally filename t
)
1372 (when (and (file-exists-p filename
)
1373 (not (file-readable-p filename
)))
1375 (signal 'file-error
(list "File is not readable"
1377 ;; Unconditionally set error
1380 (insert-file-contents filename t
)
1382 (when (and (file-exists-p filename
)
1383 (not (file-readable-p filename
)))
1385 (signal 'file-error
(list "File is not readable"
1387 ;; Run find-file-not-found-hooks until one returns non-nil.
1388 (or (run-hook-with-args-until-success 'find-file-not-found-functions
)
1389 ;; If they fail too, set error.
1391 ;; Record the file's truename, and maybe use that as visited name.
1392 (if (equal filename buffer-file-name
)
1393 (setq buffer-file-truename truename
)
1394 (setq buffer-file-truename
1395 (abbreviate-file-name (file-truename buffer-file-name
))))
1396 (setq buffer-file-number number
)
1397 ;; On VMS, we may want to remember which directory in a search list
1398 ;; the file was found in.
1399 (and (eq system-type
'vax-vms
)
1401 (if (string-match ":" (file-name-directory filename
))
1402 (setq logical
(substring (file-name-directory filename
)
1403 0 (match-beginning 0))))
1404 (not (member logical find-file-not-true-dirname-list
)))
1405 (setq buffer-file-name buffer-file-truename
))
1406 (if find-file-visit-truename
1407 (setq buffer-file-name
1409 (expand-file-name buffer-file-truename
))))
1410 ;; Set buffer's default directory to that of the file.
1411 (setq default-directory
(file-name-directory buffer-file-name
))
1412 ;; Turn off backup files for certain file names. Since
1413 ;; this is a permanent local, the major mode won't eliminate it.
1414 (and (not (funcall backup-enable-predicate buffer-file-name
))
1416 (make-local-variable 'backup-inhibited
)
1417 (setq backup-inhibited t
)))
1420 (set-buffer-multibyte nil
)
1421 (setq buffer-file-coding-system
'no-conversion
)
1422 (make-local-variable 'find-file-literally
)
1423 (setq find-file-literally t
))
1424 (after-find-file error
(not nowarn
)))
1427 (defun insert-file-contents-literally (filename &optional visit beg end replace
)
1428 "Like `insert-file-contents', but only reads in the file literally.
1429 A buffer may be modified in several ways after reading into the buffer,
1430 to Emacs features such as format decoding, character code
1431 conversion, `find-file-hook', automatic uncompression, etc.
1433 This function ensures that none of these modifications will take place."
1434 (let ((format-alist nil
)
1435 (after-insert-file-functions nil
)
1436 (coding-system-for-read 'no-conversion
)
1437 (coding-system-for-write 'no-conversion
)
1438 (find-buffer-file-type-function
1439 (if (fboundp 'find-buffer-file-type
)
1440 (symbol-function 'find-buffer-file-type
)
1442 (inhibit-file-name-handlers
1443 (append '(jka-compr-handler image-file-handler
)
1444 inhibit-file-name-handlers
))
1445 (inhibit-file-name-operation 'insert-file-contents
))
1448 (fset 'find-buffer-file-type
(lambda (filename) t
))
1449 (insert-file-contents filename visit beg end replace
))
1450 (if find-buffer-file-type-function
1451 (fset 'find-buffer-file-type find-buffer-file-type-function
)
1452 (fmakunbound 'find-buffer-file-type
)))))
1454 (defun insert-file-1 (filename insert-func
)
1455 (if (file-directory-p filename
)
1456 (signal 'file-error
(list "Opening input file" "file is a directory"
1458 (let* ((buffer (find-buffer-visiting (abbreviate-file-name (file-truename filename
))
1459 #'buffer-modified-p
))
1460 (tem (funcall insert-func filename
)))
1461 (push-mark (+ (point) (car (cdr tem
))))
1463 (message "File %s already visited and modified in buffer %s"
1464 filename
(buffer-name buffer
)))))
1466 (defun insert-file-literally (filename)
1467 "Insert contents of file FILENAME into buffer after point with no conversion.
1469 This function is meant for the user to run interactively.
1470 Don't call it from programs! Use `insert-file-contents-literally' instead.
1471 \(Its calling sequence is different; see its documentation)."
1472 (interactive "*fInsert file literally: ")
1473 (insert-file-1 filename
#'insert-file-contents-literally
))
1475 (defvar find-file-literally nil
1476 "Non-nil if this buffer was made by `find-file-literally' or equivalent.
1477 This is a permanent local.")
1478 (put 'find-file-literally
'permanent-local t
)
1480 (defun find-file-literally (filename)
1481 "Visit file FILENAME with no conversion of any kind.
1482 Format conversion and character code conversion are both disabled,
1483 and multibyte characters are disabled in the resulting buffer.
1484 The major mode used is Fundamental mode regardless of the file name,
1485 and local variable specifications in the file are ignored.
1486 Automatic uncompression and adding a newline at the end of the
1487 file due to `require-final-newline' is also disabled.
1489 You cannot absolutely rely on this function to result in
1490 visiting the file literally. If Emacs already has a buffer
1491 which is visiting the file, you get the existing buffer,
1492 regardless of whether it was created literally or not.
1494 In a Lisp program, if you want to be sure of accessing a file's
1495 contents literally, you should create a temporary buffer and then read
1496 the file contents into it using `insert-file-contents-literally'."
1497 (interactive "FFind file literally: ")
1498 (switch-to-buffer (find-file-noselect filename nil t
)))
1500 (defvar after-find-file-from-revert-buffer nil
)
1502 (defun after-find-file (&optional error warn noauto
1503 after-find-file-from-revert-buffer
1505 "Called after finding a file and by the default revert function.
1506 Sets buffer mode, parses local variables.
1507 Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an
1508 error in reading the file. WARN non-nil means warn if there
1509 exists an auto-save file more recent than the visited file.
1510 NOAUTO means don't mess with auto-save mode.
1511 Fourth arg AFTER-FIND-FILE-FROM-REVERT-BUFFER non-nil
1512 means this call was from `revert-buffer'.
1513 Fifth arg NOMODES non-nil means don't alter the file's modes.
1514 Finishes by calling the functions in `find-file-hook'
1515 unless NOMODES is non-nil."
1516 (setq buffer-read-only
(not (file-writable-p buffer-file-name
)))
1523 ((and error
(file-attributes buffer-file-name
))
1524 (setq buffer-read-only t
)
1525 "File exists, but cannot be read")
1526 ((not buffer-read-only
)
1528 ;; No need to warn if buffer is auto-saved
1529 ;; under the name of the visited file.
1530 (not (and buffer-file-name
1531 auto-save-visited-file-name
))
1532 (file-newer-than-file-p (or buffer-auto-save-file-name
1533 (make-auto-save-file-name))
1535 (format "%s has auto save data; consider M-x recover-this-file"
1536 (file-name-nondirectory buffer-file-name
))
1537 (setq not-serious t
)
1538 (if error
"(New file)" nil
)))
1540 (setq not-serious t
)
1541 "Note: file is write protected")
1542 ((file-attributes (directory-file-name default-directory
))
1543 "File not found and directory write-protected")
1544 ((file-exists-p (file-name-directory buffer-file-name
))
1545 (setq buffer-read-only nil
))
1547 (setq buffer-read-only nil
)
1548 "Use M-x make-directory RET RET to create the directory and its parents"))))
1551 (or not-serious
(sit-for 1 t
))))
1552 (when (and auto-save-default
(not noauto
))
1553 (auto-save-mode t
)))
1554 ;; Make people do a little extra work (C-x C-q)
1555 ;; before altering a backup file.
1556 (when (backup-file-name-p buffer-file-name
)
1557 (setq buffer-read-only t
))
1558 ;; When a file is marked read-only,
1559 ;; make the buffer read-only even if root is looking at it.
1560 (when (and (file-modes (buffer-file-name))
1561 (zerop (logand (file-modes (buffer-file-name)) #o222
)))
1562 (setq buffer-read-only t
))
1564 (when (and view-read-only view-mode
)
1565 (view-mode-disable))
1567 (when (and buffer-read-only
1569 (not (eq (get major-mode
'mode-class
) 'special
)))
1571 (run-hooks 'find-file-hook
)))
1573 (defmacro report-errors
(format &rest body
)
1574 "Eval BODY and turn any error into a FORMAT message.
1575 FORMAT can have a %s escape which will be replaced with the actual error.
1576 If `debug-on-error' is set, errors are not caught, so that you can
1578 Avoid using a large BODY since it is duplicated."
1579 (declare (debug t
) (indent 1))
1584 (error (message ,format
(prin1-to-string err
))))))
1586 (defun normal-mode (&optional find-file
)
1587 "Choose the major mode for this buffer automatically.
1588 Also sets up any specified local variables of the file.
1589 Uses the visited file name, the -*- line, and the local variables spec.
1591 This function is called automatically from `find-file'. In that case,
1592 we may set up the file-specified mode and local variables,
1593 depending on the value of `enable-local-variables': if it is t, we do;
1594 if it is nil, we don't; otherwise, we query.
1595 In addition, if `local-enable-local-variables' is nil, we do
1596 not set local variables (though we do notice a mode specified with -*-.)
1598 `enable-local-variables' is ignored if you run `normal-mode' interactively,
1599 or from Lisp without specifying the optional argument FIND-FILE;
1600 in that case, this function acts as if `enable-local-variables' were t."
1602 (or find-file
(funcall (or default-major-mode
'fundamental-mode
)))
1603 (report-errors "File mode specification error: %s"
1605 (report-errors "File local-variables error: %s"
1606 (let ((enable-local-variables (or (not find-file
) enable-local-variables
)))
1607 (hack-local-variables)))
1608 (if (fboundp 'ucs-set-table-for-input
) ; don't lose when building
1609 (ucs-set-table-for-input)))
1611 (defvar auto-mode-alist
1612 ;; Note: The entries for the modes defined in cc-mode.el (c-mode,
1613 ;; c++-mode, java-mode and more) are added through autoload
1614 ;; directives in that file. That way is discouraged since it
1615 ;; spreads out the definition of the initial value.
1618 (cons (purecopy (car elt
)) (cdr elt
)))
1619 '(("\\.te?xt\\'" . text-mode
)
1620 ("\\.tex\\'" . tex-mode
)
1621 ("\\.ins\\'" . tex-mode
) ;Installation files for TeX packages.
1622 ("\\.ltx\\'" . latex-mode
)
1623 ("\\.dtx\\'" . doctex-mode
)
1624 ("\\.el\\'" . emacs-lisp-mode
)
1625 ("\\.\\(scm\\|stk\\|ss\\|sch\\)\\'" . scheme-mode
)
1626 ("\\.l\\'" . lisp-mode
)
1627 ("\\.lisp\\'" . lisp-mode
)
1628 ("\\.f\\'" . fortran-mode
)
1629 ("\\.F\\'" . fortran-mode
)
1630 ("\\.for\\'" . fortran-mode
)
1631 ("\\.p\\'" . pascal-mode
)
1632 ("\\.pas\\'" . pascal-mode
)
1633 ("\\.ad[abs]\\'" . ada-mode
)
1634 ("\\.ad[bs].dg\\'" . ada-mode
)
1635 ("\\.\\([pP]\\([Llm]\\|erl\\)\\|al\\)\\'" . perl-mode
)
1636 ("\\.s?html?\\'" . html-mode
)
1637 ("\\.mk\\'" . makefile-mode
)
1638 ("\\(M\\|m\\|GNUm\\)akefile\\'" . makefile-mode
)
1639 ("\\.am\\'" . makefile-mode
) ;For Automake.
1640 ;; Less common extensions come here
1641 ;; so more common ones above are found faster.
1642 ("\\.texinfo\\'" . texinfo-mode
)
1643 ("\\.te?xi\\'" . texinfo-mode
)
1644 ("\\.s\\'" . asm-mode
)
1645 ("\\.S\\'" . asm-mode
)
1646 ("\\.asm\\'" . asm-mode
)
1647 ("ChangeLog\\'" . change-log-mode
)
1648 ("change\\.log\\'" . change-log-mode
)
1649 ("changelo\\'" . change-log-mode
)
1650 ("ChangeLog\\.[0-9]+\\'" . change-log-mode
)
1651 ;; for MSDOS and MS-Windows (which are case-insensitive)
1652 ("changelog\\'" . change-log-mode
)
1653 ("changelog\\.[0-9]+\\'" . change-log-mode
)
1654 ("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode
)
1655 ("\\.scm\\.[0-9]*\\'" . scheme-mode
)
1656 ("\\.[ck]?sh\\'\\|\\.shar\\'\\|/\\.z?profile\\'" . sh-mode
)
1657 ("\\.bash\\'" . sh-mode
)
1658 ("\\(/\\|\\`\\)\\.\\(bash_profile\\|z?login\\|bash_login\\|z?logout\\)\\'" . sh-mode
)
1659 ("\\(/\\|\\`\\)\\.\\(bash_logout\\|shrc\\|[kz]shrc\\|bashrc\\|t?cshrc\\|esrc\\)\\'" . sh-mode
)
1660 ("\\(/\\|\\`\\)\\.\\([kz]shenv\\|xinitrc\\|startxrc\\|xsession\\)\\'" . sh-mode
)
1661 ("\\.m?spec\\'" . sh-mode
)
1662 ("\\.mm\\'" . nroff-mode
)
1663 ("\\.me\\'" . nroff-mode
)
1664 ("\\.ms\\'" . nroff-mode
)
1665 ("\\.man\\'" . nroff-mode
)
1666 ("\\.TeX\\'" . tex-mode
)
1667 ("\\.sty\\'" . latex-mode
)
1668 ("\\.cls\\'" . latex-mode
) ;LaTeX 2e class
1669 ("\\.clo\\'" . latex-mode
) ;LaTeX 2e class option
1670 ("\\.bbl\\'" . latex-mode
)
1671 ("\\.bib\\'" . bibtex-mode
)
1672 ("\\.sql\\'" . sql-mode
)
1673 ("\\.m4\\'" . m4-mode
)
1674 ("\\.mc\\'" . m4-mode
)
1675 ("\\.mf\\'" . metafont-mode
)
1676 ("\\.mp\\'" . metapost-mode
)
1677 ("\\.vhdl?\\'" . vhdl-mode
)
1678 ("\\.article\\'" . text-mode
)
1679 ("\\.letter\\'" . text-mode
)
1680 ("\\.tcl\\'" . tcl-mode
)
1681 ("\\.exp\\'" . tcl-mode
)
1682 ("\\.itcl\\'" . tcl-mode
)
1683 ("\\.itk\\'" . tcl-mode
)
1684 ("\\.icn\\'" . icon-mode
)
1685 ("\\.sim\\'" . simula-mode
)
1686 ("\\.mss\\'" . scribe-mode
)
1687 ("\\.f90\\'" . f90-mode
)
1688 ("\\.f95\\'" . f90-mode
)
1689 ("\\.indent\\.pro\\'" . fundamental-mode
) ; to avoid idlwave-mode
1690 ("\\.pro\\'" . idlwave-mode
)
1691 ("\\.lsp\\'" . lisp-mode
)
1692 ("\\.prolog\\'" . prolog-mode
)
1693 ("\\.tar\\'" . tar-mode
)
1694 ("\\.\\(arc\\|zip\\|lzh\\|zoo\\|ear\\|jar\\|war\\)\\'" . archive-mode
)
1695 ("\\.\\(ARC\\|ZIP\\|LZH\\|ZOO\\|EAR\\|JAR\\|WAR\\)\\'" . archive-mode
)
1696 ("\\.sx[dmicw]\\'" . archive-mode
) ; OpenOffice.org
1697 ;; Mailer puts message to be edited in
1698 ;; /tmp/Re.... or Message
1699 ("\\`/tmp/Re" . text-mode
)
1700 ("/Message[0-9]*\\'" . text-mode
)
1701 ("/drafts/[0-9]+\\'" . mh-letter-mode
)
1702 ("\\.zone\\'" . zone-mode
)
1703 ;; some news reader is reported to use this
1704 ("\\`/tmp/fol/" . text-mode
)
1705 ("\\.oak\\'" . scheme-mode
)
1706 ("\\.sgml?\\'" . sgml-mode
)
1707 ("\\.xml\\'" . sgml-mode
)
1708 ("\\.xsl\\'" . sgml-mode
)
1709 ("\\.dtd\\'" . sgml-mode
)
1710 ("\\.ds\\(ss\\)?l\\'" . dsssl-mode
)
1711 ;; .emacs or .gnus or .viper following a directory delimiter in
1712 ;; Unix, MSDOG or VMS syntax.
1713 ("[]>:/\\]\\..*\\(emacs\\|gnus\\|viper\\)\\'" . emacs-lisp-mode
)
1714 ("\\`\\..*emacs\\'" . emacs-lisp-mode
)
1715 ;; _emacs following a directory delimiter
1717 ("[:/]_emacs\\'" . emacs-lisp-mode
)
1718 ("/crontab\\.X*[0-9]+\\'" . shell-script-mode
)
1719 ("\\.ml\\'" . lisp-mode
)
1720 ("\\.\\(asn\\|mib\\|smi\\)\\'" . snmp-mode
)
1721 ("\\.\\(as\\|mi\\|sm\\)2\\'" . snmpv2-mode
)
1722 ("\\.\\(diffs?\\|patch\\|rej\\)\\'" . diff-mode
)
1723 ("\\.\\(dif\\|pat\\)\\'" . diff-mode
) ; for MSDOG
1724 ("\\.[eE]?[pP][sS]\\'" . ps-mode
)
1725 ("configure\\.\\(ac\\|in\\)\\'" . autoconf-mode
)
1726 ("BROWSE\\'" . ebrowse-tree-mode
)
1727 ("\\.ebrowse\\'" . ebrowse-tree-mode
)
1728 ("#\\*mail\\*" . mail-mode
)
1729 ;; Get rid of any trailing .n.m and try again.
1730 ;; This is for files saved by cvs-merge that look like .#<file>.<rev>
1731 ;; or .#<file>.<rev>-<rev> or VC's <file>.~<rev>~.
1732 ;; Using mode nil rather than `ignore' would let the search continue
1733 ;; through this list (with the shortened name) rather than start over.
1734 ("\\.~?[0-9]+\\.[0-9][-.0-9]*~?\\'" ignore t
)
1735 ;; The following should come after the ChangeLog pattern
1736 ;; for the sake of ChangeLog.1, etc.
1737 ;; and after the .scm.[0-9] and CVS' <file>.<rev> patterns too.
1738 ("\\.[1-9]\\'" . nroff-mode
)
1739 ("\\.g\\'" . antlr-mode
)
1740 ("\\.ses\\'" . ses-mode
)
1741 ("\\.orig\\'" nil t
) ; from patch
1742 ("\\.in\\'" nil t
)))
1743 "Alist of filename patterns vs corresponding major mode functions.
1744 Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION NON-NIL).
1745 \(NON-NIL stands for anything that is not nil; the value does not matter.)
1746 Visiting a file whose name matches REGEXP specifies FUNCTION as the
1747 mode function to use. FUNCTION will be called, unless it is nil.
1749 If the element has the form (REGEXP FUNCTION NON-NIL), then after
1750 calling FUNCTION (if it's not nil), we delete the suffix that matched
1751 REGEXP and search the list again for another match.")
1754 (defvar interpreter-mode-alist
1755 ;; Note: The entries for the modes defined in cc-mode.el (awk-mode
1756 ;; and pike-mode) are added through autoload directives in that
1757 ;; file. That way is discouraged since it spreads out the
1758 ;; definition of the initial value.
1761 (cons (purecopy (car l
)) (cdr l
)))
1762 '(("perl" . perl-mode
)
1763 ("perl5" . perl-mode
)
1764 ("miniperl" . perl-mode
)
1766 ("wishx" . tcl-mode
)
1768 ("tclsh" . tcl-mode
)
1769 ("scm" . scheme-mode
)
1789 ("tail" . text-mode
)
1790 ("more" . text-mode
)
1791 ("less" . text-mode
)
1793 ("make" . makefile-mode
) ; Debian uses this
1794 ("guile" . scheme-mode
)
1795 ("clisp" . lisp-mode
)))
1796 "Alist mapping interpreter names to major modes.
1797 This alist applies to files whose first line starts with `#!'.
1798 Each element looks like (INTERPRETER . MODE).
1799 The car of each element is compared with
1800 the name of the interpreter specified in the first line.
1801 If it matches, mode MODE is selected.")
1803 (defvar inhibit-first-line-modes-regexps
'("\\.tar\\'" "\\.tgz\\'")
1804 "List of regexps; if one matches a file name, don't look for `-*-'.")
1806 (defvar inhibit-first-line-modes-suffixes nil
1807 "List of regexps for what to ignore, for `inhibit-first-line-modes-regexps'.
1808 When checking `inhibit-first-line-modes-regexps', we first discard
1809 from the end of the file name anything that matches one of these regexps.")
1811 (defvar auto-mode-interpreter-regexp
1812 "#![ \t]?\\([^ \t\n]*\
1813 /bin/env[ \t]\\)?\\([^ \t\n]+\\)"
1814 "Regular expression matching interpreters, for file mode determination.
1815 This regular expression is matched against the first line of a file
1816 to determine the file's mode in `set-auto-mode' when Emacs can't deduce
1817 a mode from the file's name. If it matches, the file is assumed to
1818 be interpreted by the interpreter matched by the second group of the
1819 regular expression. The mode is then determined as the mode associated
1820 with that interpreter in `interpreter-mode-alist'.")
1822 (defun set-auto-mode (&optional just-from-file-name
)
1823 "Select major mode appropriate for current buffer.
1824 This checks for a -*- mode tag in the buffer's text,
1825 compares the filename against the entries in `auto-mode-alist',
1826 or checks the interpreter that runs this file against
1827 `interpreter-mode-alist'.
1829 It does not check for the `mode:' local variable in the
1830 Local Variables section of the file; for that, use `hack-local-variables'.
1832 If `enable-local-variables' is nil, this function does not check for a
1835 If the optional argument JUST-FROM-FILE-NAME is non-nil,
1836 then we do not set anything but the major mode,
1837 and we don't even do that unless it would come from the file name."
1838 ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
1839 (let (end done modes
)
1841 (goto-char (point-min))
1842 (skip-chars-forward " \t\n")
1843 (and enable-local-variables
1844 (setq end
(set-auto-mode-1))
1845 (if (save-excursion (search-forward ":" end t
))
1846 ;; Find all specifications for the `mode:' variable
1847 ;; and execute them left to right.
1848 (while (let ((case-fold-search t
))
1849 (or (and (looking-at "mode:")
1850 (goto-char (match-end 0)))
1851 (re-search-forward "[ \t;]mode:" end t
)))
1852 (skip-chars-forward " \t")
1853 (let ((beg (point)))
1854 (if (search-forward ";" end t
)
1857 (skip-chars-backward " \t")
1858 (push (intern (concat (downcase (buffer-substring beg
(point))) "-mode"))
1860 ;; Simple -*-MODE-*- case.
1861 (push (intern (concat (downcase (buffer-substring (point) end
))
1864 ;; If we found modes to use, invoke them now,
1865 ;; outside the save-excursion.
1866 (unless just-from-file-name
1867 (dolist (mode (nreverse modes
))
1868 (if (not (functionp mode
))
1869 (message "Ignoring unknown mode `%s'" mode
)
1872 ;; If we didn't find a mode from a -*- line, try using the file name.
1873 (if (and (not done
) buffer-file-name
)
1874 (let ((name buffer-file-name
)
1876 ;; Remove backup-suffixes from file name.
1877 (setq name
(file-name-sans-versions name
))
1879 (setq keep-going nil
)
1880 (let ((alist auto-mode-alist
)
1882 ;; Find first matching alist entry.
1883 (let ((case-fold-search
1884 (memq system-type
'(vax-vms windows-nt cygwin
))))
1885 (while (and (not mode
) alist
)
1886 (if (string-match (car (car alist
)) name
)
1887 (if (and (consp (cdr (car alist
)))
1888 (nth 2 (car alist
)))
1889 (setq mode
(car (cdr (car alist
)))
1890 name
(substring name
0 (match-beginning 0))
1892 (setq mode
(cdr (car alist
))
1894 (setq alist
(cdr alist
))))
1896 ;; When JUST-FROM-FILE-NAME is set,
1897 ;; we are working on behalf of set-visited-file-name.
1898 ;; In that case, if the major mode specified is the
1899 ;; same one we already have, don't actually reset it.
1900 ;; We don't want to lose minor modes such as Font Lock.
1901 (unless (and just-from-file-name
(eq mode major-mode
))
1903 ;; If we can't deduce a mode from the file name,
1904 ;; look for an interpreter specified in the first line.
1905 ;; As a special case, allow for things like "#!/bin/env perl",
1906 ;; which finds the interpreter anywhere in $PATH.
1909 (goto-char (point-min))
1910 (if (looking-at auto-mode-interpreter-regexp
)
1914 ;; Map interpreter name to a mode.
1915 (setq elt
(assoc (file-name-nondirectory interpreter
)
1916 interpreter-mode-alist
))
1917 (unless just-from-file-name
1919 (funcall (cdr elt
))))))))))))
1922 (defun set-auto-mode-1 ()
1923 "Find the -*- spec in the buffer.
1924 Call with point at the place to start searching from.
1925 If one is found, set point to the beginning
1926 and return the position of the end.
1927 Otherwise, return nil; point may be changed."
1930 ;; Don't look for -*- if this file name matches any
1931 ;; of the regexps in inhibit-first-line-modes-regexps.
1932 (let ((temp inhibit-first-line-modes-regexps
)
1933 (name (if buffer-file-name
1934 (file-name-sans-versions buffer-file-name
)
1936 (while (let ((sufs inhibit-first-line-modes-suffixes
))
1937 (while (and sufs
(not (string-match (car sufs
) name
)))
1938 (setq sufs
(cdr sufs
)))
1940 (setq name
(substring name
0 (match-beginning 0))))
1942 (not (string-match (car temp
) name
)))
1943 (setq temp
(cdr temp
)))
1946 (search-forward "-*-" (save-excursion
1947 ;; If the file begins with "#!"
1948 ;; (exec interpreter magic), look
1949 ;; for mode frobs in the first two
1950 ;; lines. You cannot necessarily
1951 ;; put them in the first line of
1952 ;; such a file without screwing up
1953 ;; the interpreter invocation.
1954 (end-of-line (and (looking-at "^#!") 2))
1957 (skip-chars-forward " \t")
1959 (search-forward "-*-"
1960 (save-excursion (end-of-line) (point))
1964 (skip-chars-backward " \t")
1969 (defun hack-local-variables-prop-line (&optional mode-only
)
1970 "Set local variables specified in the -*- line.
1971 Ignore any specification for `mode:' and `coding:';
1972 `set-auto-mode' should already have handled `mode:',
1973 `set-auto-coding' should already have handled `coding:'.
1974 If MODE-ONLY is non-nil, all we do is check whether the major mode
1975 is specified, returning t if it is specified."
1977 (goto-char (point-min))
1979 (end (set-auto-mode-1))
1981 (enable-local-variables
1982 (and local-enable-local-variables enable-local-variables
)))
1983 ;; Parse the -*- line into the RESULT alist.
1984 ;; Also set MODE-SPECIFIED if we see a spec or `mode'.
1987 ((looking-at "[ \t]*\\([^ \t\n\r:;]+\\)\\([ \t]*-\\*-\\)")
1988 ;; Simple form: "-*- MODENAME -*-". Already handled.
1989 (setq mode-specified t
)
1992 ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-'
1993 ;; (last ";" is optional).
1994 (while (< (point) end
)
1995 (or (looking-at "[ \t]*\\([^ \t\n:]+\\)[ \t]*:[ \t]*")
1996 (error "Malformed -*- line"))
1997 (goto-char (match-end 0))
1998 ;; There used to be a downcase here,
1999 ;; but the manual didn't say so,
2000 ;; and people want to set var names that aren't all lc.
2001 (let ((key (intern (buffer-substring
2004 (val (save-restriction
2005 (narrow-to-region (point) end
)
2006 (read (current-buffer)))))
2007 ;; It is traditional to ignore
2008 ;; case when checking for `mode' in set-auto-mode,
2009 ;; so we must do that here as well.
2010 ;; That is inconsistent, but we're stuck with it.
2011 ;; The same can be said for `coding' in set-auto-coding.
2012 (or (equal (downcase (symbol-name key
)) "mode")
2013 (equal (downcase (symbol-name key
)) "coding")
2014 (setq result
(cons (cons key val
) result
)))
2015 (if (equal (downcase (symbol-name key
)) "mode")
2016 (setq mode-specified t
))
2017 (skip-chars-forward " \t;")))
2018 (setq result
(nreverse result
))))
2020 (if mode-only mode-specified
2023 (eq enable-local-variables t
)
2024 (and enable-local-variables
2025 (save-window-excursion
2027 (switch-to-buffer (current-buffer))
2029 ;; If we fail to switch in the selected window,
2030 ;; it is probably a minibuffer.
2031 ;; So try another window.
2033 (switch-to-buffer-other-window (current-buffer))
2035 (switch-to-buffer-other-frame (current-buffer))))))
2036 (y-or-n-p (format "Set local variables as specified in -*- line of %s? "
2037 (file-name-nondirectory buffer-file-name
)))))))
2038 (let ((enable-local-eval enable-local-eval
))
2040 (hack-one-local-variable (car (car result
)) (cdr (car result
)))
2041 (setq result
(cdr result
)))))
2044 (defvar hack-local-variables-hook nil
2045 "Normal hook run after processing a file's local variables specs.
2046 Major modes can use this to examine user-specified local variables
2047 in order to initialize other data structure based on them.")
2049 (defun hack-local-variables (&optional mode-only
)
2050 "Parse and put into effect this buffer's local variables spec.
2051 If MODE-ONLY is non-nil, all we do is check whether the major mode
2052 is specified, returning t if it is specified."
2053 (let ((mode-specified
2054 ;; If MODE-ONLY is t, we check here for specifying the mode
2055 ;; in the -*- line. If MODE-ONLY is nil, we process
2056 ;; the -*- line here.
2057 (hack-local-variables-prop-line mode-only
))
2058 (enable-local-variables
2059 (and local-enable-local-variables enable-local-variables
)))
2060 ;; Look for "Local variables:" line in last page.
2062 (goto-char (point-max))
2063 (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move
)
2064 (if (let ((case-fold-search t
))
2065 (and (search-forward "Local Variables:" nil t
)
2066 (or (eq enable-local-variables t
)
2068 (and enable-local-variables
2069 (save-window-excursion
2070 (switch-to-buffer (current-buffer))
2073 (set-window-start (selected-window) (point)))
2074 (y-or-n-p (format "Set local variables as specified at end of %s? "
2075 (if buffer-file-name
2076 (file-name-nondirectory
2079 (buffer-name))))))))))
2081 prefix prefixlen suffix beg
2083 (enable-local-eval enable-local-eval
))
2084 ;; The prefix is what comes before "local variables:" in its line.
2085 ;; The suffix is what comes after "local variables:" in its line.
2086 (skip-chars-forward " \t")
2088 (setq suffix
(buffer-substring (point)
2089 (progn (end-of-line) (point)))))
2090 (goto-char (match-beginning 0))
2093 (buffer-substring (point)
2094 (progn (beginning-of-line) (point)))))
2096 (if prefix
(setq prefixlen
(length prefix
)
2097 prefix
(regexp-quote prefix
)))
2098 (if suffix
(setq suffix
(concat (regexp-quote suffix
) "$")))
2100 ;; Look at next local variable spec.
2101 (if selective-display
(re-search-forward "[\n\C-m]")
2103 ;; Skip the prefix, if any.
2105 (if (looking-at prefix
)
2106 (forward-char prefixlen
)
2107 (error "Local variables entry is missing the prefix")))
2108 ;; Find the variable name; strip whitespace.
2109 (skip-chars-forward " \t")
2111 (skip-chars-forward "^:\n")
2112 (if (eolp) (error "Missing colon in local variables entry"))
2113 (skip-chars-backward " \t")
2114 (let* ((str (buffer-substring beg
(point)))
2117 ;; Setting variable named "end" means end of list.
2118 (if (string-equal (downcase str
) "end")
2120 ;; Otherwise read the variable value.
2121 (skip-chars-forward "^:")
2123 (setq val
(read (current-buffer)))
2124 (skip-chars-backward "\n")
2125 (skip-chars-forward " \t")
2126 (or (if suffix
(looking-at suffix
) (eolp))
2127 (error "Local variables entry is terminated incorrectly"))
2130 (setq mode-specified t
))
2131 ;; Set the variable. "Variables" mode and eval are funny.
2132 (hack-one-local-variable var val
))))))))
2134 (run-hooks 'hack-local-variables-hook
))
2137 (defvar ignored-local-variables
2138 '(enable-local-eval)
2139 "Variables to be ignored in a file's local variable spec.")
2141 ;; Get confirmation before setting these variables as locals in a file.
2142 (put 'debugger
'risky-local-variable t
)
2143 (put 'enable-local-eval
'risky-local-variable t
)
2144 (put 'ignored-local-variables
'risky-local-variable t
)
2145 (put 'eval
'risky-local-variable t
)
2146 (put 'file-name-handler-alist
'risky-local-variable t
)
2147 (put 'inhibit-quit
'risky-local-variable t
)
2148 (put 'minor-mode-alist
'risky-local-variable t
)
2149 (put 'minor-mode-map-alist
'risky-local-variable t
)
2150 (put 'minor-mode-overriding-map-alist
'risky-local-variable t
)
2151 (put 'overriding-local-map
'risky-local-variable t
)
2152 (put 'overriding-terminal-local-map
'risky-local-variable t
)
2153 (put 'auto-mode-alist
'risky-local-variable t
)
2154 (put 'after-load-alist
'risky-local-variable t
)
2155 (put 'buffer-file-name
'risky-local-variable t
)
2156 (put 'buffer-undo-list
'risky-local-variable t
)
2157 (put 'buffer-auto-save-file-name
'risky-local-variable t
)
2158 (put 'buffer-file-truename
'risky-local-variable t
)
2159 (put 'default-text-properties
'risky-local-variable t
)
2160 (put 'exec-path
'risky-local-variable t
)
2161 (put 'load-path
'risky-local-variable t
)
2162 (put 'exec-directory
'risky-local-variable t
)
2163 (put 'process-environment
'risky-local-variable t
)
2164 (put 'dabbrev-case-fold-search
'risky-local-variable t
)
2165 (put 'dabbrev-case-replace
'risky-local-variable t
)
2166 ;; Don't wait for outline.el to be loaded, for the sake of outline-minor-mode.
2167 (put 'outline-level
'risky-local-variable t
)
2168 (put 'rmail-output-file-alist
'risky-local-variable t
)
2169 (put 'font-lock-defaults
'risky-local-variable t
)
2170 (put 'special-display-buffer-names
'risky-local-variable t
)
2171 (put 'frame-title-format
'risky-local-variable t
)
2172 (put 'global-mode-string
'risky-local-variable t
)
2173 (put 'header-line-format
'risky-local-variable t
)
2174 (put 'icon-title-format
'risky-local-variable t
)
2175 (put 'input-method-alist
'risky-local-variable t
)
2176 (put 'format-alist
'risky-local-variable t
)
2177 (put 'vc-mode
'risky-local-variable t
)
2178 (put 'imenu-generic-expression
'risky-local-variable t
)
2179 (put 'imenu--index-alist
'risky-local-variable t
)
2180 (put 'standard-input
'risky-local-variable t
)
2181 (put 'standard-output
'risky-local-variable t
)
2182 (put 'unread-command-events
'risky-local-variable t
)
2183 (put 'max-lisp-eval-depth
'risky-local-variable t
)
2184 (put 'max-specpdl-size
'risky-local-variable t
)
2185 (put 'mode-line-format
'risky-local-variable t
)
2186 (put 'mode-line-modified
'risky-local-variable t
)
2187 (put 'mode-line-mule-info
'risky-local-variable t
)
2188 (put 'mode-line-buffer-identification
'risky-local-variable t
)
2189 (put 'mode-line-modes
'risky-local-variable t
)
2190 (put 'mode-line-position
'risky-local-variable t
)
2191 (put 'mode-line-process
'risky-local-variable t
)
2192 (put 'mode-name
'risky-local-variable t
)
2193 (put 'display-time-string
'risky-local-variable t
)
2194 (put 'parse-time-rules
'risky-local-variable t
)
2196 ;; This case is safe because the user gets to check it before it is used.
2197 (put 'compile-command
'safe-local-variable
'stringp
)
2199 (defun risky-local-variable-p (sym &optional val
)
2200 "Non-nil if SYM could be dangerous as a file-local variable with value VAL.
2201 If VAL is nil or omitted, the question is whether any value might be
2203 (let ((safep (get sym
'safe-local-variable
)))
2204 (or (memq sym ignored-local-variables
)
2205 (get sym
'risky-local-variable
)
2206 (and (string-match "-hooks?$\\|-functions?$\\|-forms?$\\|-program$\\|-command$\\|-predicate$\\|font-lock-keywords$\\|font-lock-keywords-[0-9]+$\\|font-lock-syntactic-keywords$\\|-frame-alist$\\|-mode-alist$\\|-map$\\|-map-alist$"
2209 ;; If the safe-local-variable property isn't t or nil,
2210 ;; then it must return non-nil on the proposed value to be safe.
2211 (and (not (memq safep
'(t nil
)))
2213 (not (funcall safep val
)))))))
2215 (defcustom safe-local-eval-forms nil
2216 "*Expressions that are considered \"safe\" in an `eval:' local variable.
2217 Add expressions to this list if you want Emacs to evaluate them, when
2218 they appear in an `eval' local variable specification, without first
2219 asking you for confirmation."
2222 :type
'(repeat sexp
))
2224 (put 'c-set-style
'safe-local-eval-function t
)
2226 (defun hack-one-local-variable-quotep (exp)
2227 (and (consp exp
) (eq (car exp
) 'quote
) (consp (cdr exp
))))
2229 (defun hack-one-local-variable-constantp (exp)
2230 (or (and (not (symbolp exp
)) (not (consp exp
)))
2233 (hack-one-local-variable-quotep exp
)))
2235 (defun hack-one-local-variable-eval-safep (exp)
2236 "Return t if it is safe to eval EXP when it is found in a file."
2237 (or (not (consp exp
))
2238 ;; Detect certain `put' expressions.
2239 (and (eq (car exp
) 'put
)
2240 (hack-one-local-variable-quotep (nth 1 exp
))
2241 (hack-one-local-variable-quotep (nth 2 exp
))
2242 (memq (nth 1 (nth 2 exp
))
2243 '(lisp-indent-hook))
2244 ;; Only allow safe values of lisp-indent-hook;
2246 (or (numberp (nth 3 exp
))
2247 (equal (nth 3 exp
) ''defun
)))
2248 ;; Allow expressions that the user requested.
2249 (member exp safe-local-eval-forms
)
2250 ;; Certain functions can be allowed with safe arguments
2251 ;; or can specify verification functions to try.
2252 (and (symbolp (car exp
))
2253 (let ((prop (get (car exp
) 'safe-local-eval-function
)))
2256 (dolist (arg (cdr exp
))
2257 (unless (hack-one-local-variable-constantp arg
)
2264 (dolist (function prop
)
2265 (if (funcall function exp
)
2269 (defun hack-one-local-variable (var val
)
2270 "\"Set\" one variable in a local variables spec.
2271 A few patterns are specified so that any name which matches one
2272 is considered risky."
2273 (cond ((eq var
'mode
)
2274 (funcall (intern (concat (downcase (symbol-name val
))
2277 ;; We have already handled coding: tag in set-auto-coding.
2279 ;; "Setting" eval means either eval it or do nothing.
2280 ;; Likewise for setting hook variables.
2281 ((risky-local-variable-p var val
)
2282 ;; Permit evalling a put of a harmless property.
2283 ;; if the args do nothing tricky.
2284 (if (or (and (eq var
'eval
)
2285 (hack-one-local-variable-eval-safep val
))
2286 ;; Permit eval if not root and user says ok.
2287 (and (not (zerop (user-uid)))
2288 (or (eq enable-local-eval t
)
2289 (and enable-local-eval
2290 (save-window-excursion
2291 (switch-to-buffer (current-buffer))
2294 (set-window-start (selected-window) (point)))
2295 (setq enable-local-eval
2296 (y-or-n-p (format "Process `eval' or hook local variables in %s? "
2297 (if buffer-file-name
2298 (concat "file " (file-name-nondirectory buffer-file-name
))
2299 (concat "buffer " (buffer-name)))))))))))
2301 (save-excursion (eval val
))
2302 (make-local-variable var
)
2304 (message "Ignoring risky spec in the local variables list")))
2305 ;; Ordinary variable, really set it.
2306 (t (make-local-variable var
)
2307 ;; Make sure the string has no text properties.
2308 ;; Some text properties can get evaluated in various ways,
2309 ;; so it is risky to put them on with a local variable list.
2311 (set-text-properties 0 (length val
) nil val
))
2315 (defcustom change-major-mode-with-file-name t
2316 "*Non-nil means \\[write-file] should set the major mode from the file name.
2317 However, the mode will not be changed if
2318 \(1) a local variables list or the `-*-' line specifies a major mode, or
2319 \(2) the current major mode is a \"special\" mode,
2320 \ not suitable for ordinary files, or
2321 \(3) the new file name does not particularly specify any mode."
2323 :group
'editing-basics
)
2325 (defun set-visited-file-name (filename &optional no-query along-with-file
)
2326 "Change name of file visited in current buffer to FILENAME.
2327 The next time the buffer is saved it will go in the newly specified file.
2328 nil or empty string as argument means make buffer not be visiting any file.
2329 Remember to delete the initial contents of the minibuffer
2330 if you wish to pass an empty string as the argument.
2332 The optional second argument NO-QUERY, if non-nil, inhibits asking for
2333 confirmation in the case where another buffer is already visiting FILENAME.
2335 The optional third argument ALONG-WITH-FILE, if non-nil, means that
2336 the old visited file has been renamed to the new name FILENAME."
2337 (interactive "FSet visited file name: ")
2338 (if (buffer-base-buffer)
2339 (error "An indirect buffer cannot visit a file"))
2343 (if (string-equal filename
"")
2345 (expand-file-name filename
))))
2348 (setq truename
(file-truename filename
))
2349 (if find-file-visit-truename
2350 (setq filename truename
))))
2351 (let ((buffer (and filename
(find-buffer-visiting filename
))))
2352 (and buffer
(not (eq buffer
(current-buffer)))
2354 (not (y-or-n-p (message "A buffer is visiting %s; proceed? "
2357 (or (equal filename buffer-file-name
)
2359 (and filename
(lock-buffer filename
))
2361 (setq buffer-file-name filename
)
2362 (if filename
; make buffer name reflect filename.
2363 (let ((new-name (file-name-nondirectory buffer-file-name
)))
2364 (if (string= new-name
"")
2365 (error "Empty file name"))
2366 (if (eq system-type
'vax-vms
)
2367 (setq new-name
(downcase new-name
)))
2368 (setq default-directory
(file-name-directory buffer-file-name
))
2369 ;; If new-name == old-name, renaming would add a spurious <2>
2370 ;; and it's considered as a feature in rename-buffer.
2371 (or (string= new-name
(buffer-name))
2372 (rename-buffer new-name t
))))
2373 (setq buffer-backed-up nil
)
2375 (clear-visited-file-modtime))
2376 ;; Abbreviate the file names of the buffer.
2379 (setq buffer-file-truename
(abbreviate-file-name truename
))
2380 (if find-file-visit-truename
2381 (setq buffer-file-name truename
))))
2382 (setq buffer-file-number
2384 (nthcdr 10 (file-attributes buffer-file-name
))
2386 ;; write-file-functions is normally used for things like ftp-find-file
2387 ;; that visit things that are not local files as if they were files.
2388 ;; Changing to visit an ordinary local file instead should flush the hook.
2389 (kill-local-variable 'write-file-functions
)
2390 (kill-local-variable 'local-write-file-hooks
)
2391 (kill-local-variable 'revert-buffer-function
)
2392 (kill-local-variable 'backup-inhibited
)
2393 ;; If buffer was read-only because of version control,
2394 ;; that reason is gone now, so make it writable.
2396 (setq buffer-read-only nil
))
2397 (kill-local-variable 'vc-mode
)
2398 ;; Turn off backup files for certain file names.
2399 ;; Since this is a permanent local, the major mode won't eliminate it.
2400 (and buffer-file-name
2401 (not (funcall backup-enable-predicate buffer-file-name
))
2403 (make-local-variable 'backup-inhibited
)
2404 (setq backup-inhibited t
)))
2405 (let ((oauto buffer-auto-save-file-name
))
2406 ;; If auto-save was not already on, turn it on if appropriate.
2407 (if (not buffer-auto-save-file-name
)
2408 (and buffer-file-name auto-save-default
2410 ;; If auto save is on, start using a new name.
2411 ;; We deliberately don't rename or delete the old auto save
2412 ;; for the old visited file name. This is because perhaps
2413 ;; the user wants to save the new state and then compare with the
2414 ;; previous state from the auto save file.
2415 (setq buffer-auto-save-file-name
2416 (make-auto-save-file-name)))
2417 ;; Rename the old auto save file if any.
2418 (and oauto buffer-auto-save-file-name
2419 (file-exists-p oauto
)
2420 (rename-file oauto buffer-auto-save-file-name t
)))
2421 (and buffer-file-name
2422 (not along-with-file
)
2423 (set-buffer-modified-p t
))
2424 ;; Update the major mode, if the file name determines it.
2426 ;; Don't change the mode if it is special.
2427 (or (not change-major-mode-with-file-name
)
2428 (get major-mode
'mode-class
)
2429 ;; Don't change the mode if the local variable list specifies it.
2430 (hack-local-variables t
)
2434 (defun write-file (filename &optional confirm
)
2435 "Write current buffer into file FILENAME.
2436 This makes the buffer visit that file, and marks it as not modified.
2438 If you specify just a directory name as FILENAME, that means to use
2439 the default file name but in that directory. You can also yank
2440 the default file name into the minibuffer to edit it, using \\<minibuffer-local-map>\\[next-history-element].
2442 If the buffer is not already visiting a file, the default file name
2443 for the output file is the buffer name.
2445 If optional second arg CONFIRM is non-nil, this function
2446 asks for confirmation before overwriting an existing file.
2447 Interactively, confirmation is required unless you supply a prefix argument."
2448 ;; (interactive "FWrite file: ")
2450 (list (if buffer-file-name
2451 (read-file-name "Write file: "
2453 (read-file-name "Write file: " default-directory
2455 (file-name-nondirectory (buffer-name))
2458 (not current-prefix-arg
)))
2459 (or (null filename
) (string-equal filename
"")
2461 ;; If arg is just a directory,
2462 ;; use the default file name, but in that directory.
2463 (if (file-directory-p filename
)
2464 (setq filename
(concat (file-name-as-directory filename
)
2465 (file-name-nondirectory
2466 (or buffer-file-name
(buffer-name))))))
2468 (file-exists-p filename
)
2469 (or (y-or-n-p (format "File `%s' exists; overwrite? " filename
))
2470 (error "Canceled")))
2471 (set-visited-file-name filename
(not confirm
))))
2472 (set-buffer-modified-p t
)
2473 ;; Make buffer writable if file is writable.
2474 (and buffer-file-name
2475 (file-writable-p buffer-file-name
)
2476 (setq buffer-read-only nil
))
2479 (defun backup-buffer ()
2480 "Make a backup of the disk file visited by the current buffer, if appropriate.
2481 This is normally done before saving the buffer the first time.
2483 A backup may be done by renaming or by copying; see documentation of
2484 variable `make-backup-files'. If it's done by renaming, then the file is
2485 no longer accessible under its old name.
2487 The value is non-nil after a backup was made by renaming.
2488 It has the form (MODES . BACKUPNAME).
2489 MODES is the result of `file-modes' on the original
2490 file; this means that the caller, after saving the buffer, should change
2491 the modes of the new file to agree with the old modes.
2492 BACKUPNAME is the backup file name, which is the old file renamed."
2493 (if (and make-backup-files
(not backup-inhibited
)
2494 (not buffer-backed-up
)
2495 (file-exists-p buffer-file-name
)
2496 (memq (aref (elt (file-attributes buffer-file-name
) 8) 0)
2498 (let ((real-file-name buffer-file-name
)
2499 backup-info backupname targets setmodes
)
2500 ;; If specified name is a symbolic link, chase it to the target.
2501 ;; Thus we make the backups in the directory where the real file is.
2502 (setq real-file-name
(file-chase-links real-file-name
))
2503 (setq backup-info
(find-backup-file-name real-file-name
)
2504 backupname
(car backup-info
)
2505 targets
(cdr backup-info
))
2506 ;; (if (file-directory-p buffer-file-name)
2507 ;; (error "Cannot save buffer in directory %s" buffer-file-name))
2510 (let ((delete-old-versions
2511 ;; If have old versions to maybe delete,
2512 ;; ask the user to confirm now, before doing anything.
2513 ;; But don't actually delete til later.
2515 (or (eq delete-old-versions t
) (eq delete-old-versions nil
))
2516 (or delete-old-versions
2517 (y-or-n-p (format "Delete excess backup versions of %s? "
2519 (modes (file-modes buffer-file-name
)))
2520 ;; Actually write the back up file.
2522 (if (or file-precious-flag
2523 ; (file-symlink-p buffer-file-name)
2525 ;; Don't rename a suid or sgid file.
2526 (and modes
(< 0 (logand modes
#o6000
)))
2527 (and backup-by-copying-when-linked
2528 (> (file-nlinks real-file-name
) 1))
2529 (and (or backup-by-copying-when-mismatch
2530 (integerp backup-by-copying-when-privileged-mismatch
))
2531 (let ((attr (file-attributes real-file-name
)))
2532 (and (or backup-by-copying-when-mismatch
2533 (and (integerp (nth 2 attr
))
2534 (integerp backup-by-copying-when-privileged-mismatch
)
2535 (<= (nth 2 attr
) backup-by-copying-when-privileged-mismatch
)))
2537 (not (file-ownership-preserved-p real-file-name
)))))))
2538 (backup-buffer-copy real-file-name backupname modes
)
2539 ;; rename-file should delete old backup.
2540 (rename-file real-file-name backupname t
)
2541 (setq setmodes
(cons modes backupname
)))
2543 ;; If trouble writing the backup, write it in ~.
2544 (setq backupname
(expand-file-name
2545 (convert-standard-filename
2547 (message "Cannot write backup file; backing up in %s"
2548 (file-name-nondirectory backupname
))
2550 (backup-buffer-copy real-file-name backupname modes
)))
2551 (setq buffer-backed-up t
)
2552 ;; Now delete the old versions, if desired.
2553 (if delete-old-versions
2556 (delete-file (car targets
))
2558 (setq targets
(cdr targets
))))
2560 (file-error nil
))))))
2562 (defun backup-buffer-copy (from-name to-name modes
)
2564 (copy-file from-name to-name t t
)
2566 ;; If copying fails because file TO-NAME
2567 ;; is not writable, delete that file and try again.
2568 (if (and (file-exists-p to-name
)
2569 (not (file-writable-p to-name
)))
2570 (delete-file to-name
))
2571 (copy-file from-name to-name t t
)))
2573 (set-file-modes to-name
(logand modes
#o1777
))))
2575 (defun file-name-sans-versions (name &optional keep-backup-version
)
2576 "Return file NAME sans backup versions or strings.
2577 This is a separate procedure so your site-init or startup file can
2579 If the optional argument KEEP-BACKUP-VERSION is non-nil,
2580 we do not remove backup version numbers, only true file version numbers."
2581 (let ((handler (find-file-name-handler name
'file-name-sans-versions
)))
2583 (funcall handler
'file-name-sans-versions name keep-backup-version
)
2585 (if (eq system-type
'vax-vms
)
2586 ;; VMS version number is (a) semicolon, optional
2587 ;; sign, zero or more digits or (b) period, option
2588 ;; sign, zero or more digits, provided this is the
2589 ;; second period encountered outside of the
2590 ;; device/directory part of the file name.
2591 (or (string-match ";[-+]?[0-9]*\\'" name
)
2592 (if (string-match "\\.[^]>:]*\\(\\.[-+]?[0-9]*\\)\\'"
2594 (match-beginning 1))
2596 (if keep-backup-version
2598 (or (string-match "\\.~[0-9.]+~\\'" name
)
2599 (string-match "~\\'" name
)
2600 (length name
))))))))
2602 (defun file-ownership-preserved-p (file)
2603 "Return t if deleting FILE and rewriting it would preserve the owner."
2604 (let ((handler (find-file-name-handler file
'file-ownership-preserved-p
)))
2606 (funcall handler
'file-ownership-preserved-p file
)
2607 (let ((attributes (file-attributes file
)))
2608 ;; Return t if the file doesn't exist, since it's true that no
2609 ;; information would be lost by an (attempted) delete and create.
2610 (or (null attributes
)
2611 (= (nth 2 attributes
) (user-uid)))))))
2613 (defun file-name-sans-extension (filename)
2614 "Return FILENAME sans final \"extension\".
2615 The extension, in a file name, is the part that follows the last `.',
2616 except that a leading `.', if any, doesn't count."
2618 (let ((file (file-name-sans-versions (file-name-nondirectory filename
)))
2620 (if (and (string-match "\\.[^.]*\\'" file
)
2621 (not (eq 0 (match-beginning 0))))
2622 (if (setq directory
(file-name-directory filename
))
2623 ;; Don't use expand-file-name here; if DIRECTORY is relative,
2624 ;; we don't want to expand it.
2625 (concat directory
(substring file
0 (match-beginning 0)))
2626 (substring file
0 (match-beginning 0)))
2629 (defun file-name-extension (filename &optional period
)
2630 "Return FILENAME's final \"extension\".
2631 The extension, in a file name, is the part that follows the last `.',
2632 except that a leading `.', if any, doesn't count.
2633 Return nil for extensionless file names such as `foo'.
2634 Return the empty string for file names such as `foo.'.
2636 If PERIOD is non-nil, then the returned value includes the period
2637 that delimits the extension, and if FILENAME has no extension,
2640 (let ((file (file-name-sans-versions (file-name-nondirectory filename
))))
2641 (if (and (string-match "\\.[^.]*\\'" file
)
2642 (not (eq 0 (match-beginning 0))))
2643 (substring file
(+ (match-beginning 0) (if period
0 1)))
2647 (defcustom make-backup-file-name-function nil
2648 "A function to use instead of the default `make-backup-file-name'.
2649 A value of nil gives the default `make-backup-file-name' behaviour.
2651 This could be buffer-local to do something special for specific
2652 files. If you define it, you may need to change `backup-file-name-p'
2653 and `file-name-sans-versions' too.
2655 See also `backup-directory-alist'."
2657 :type
'(choice (const :tag
"Default" nil
)
2658 (function :tag
"Your function")))
2660 (defcustom backup-directory-alist nil
2661 "Alist of filename patterns and backup directory names.
2662 Each element looks like (REGEXP . DIRECTORY). Backups of files with
2663 names matching REGEXP will be made in DIRECTORY. DIRECTORY may be
2664 relative or absolute. If it is absolute, so that all matching files
2665 are backed up into the same directory, the file names in this
2666 directory will be the full name of the file backed up with all
2667 directory separators changed to `!' to prevent clashes. This will not
2668 work correctly if your filesystem truncates the resulting name.
2670 For the common case of all backups going into one directory, the alist
2671 should contain a single element pairing \".\" with the appropriate
2674 If this variable is nil, or it fails to match a filename, the backup
2675 is made in the original file's directory.
2677 On MS-DOS filesystems without long names this variable is always
2680 :type
'(repeat (cons (regexp :tag
"Regexp matching filename")
2681 (directory :tag
"Backup directory name"))))
2683 (defun normal-backup-enable-predicate (name)
2684 "Default `backup-enable-predicate' function.
2685 Checks for files in `temporary-file-directory' or
2686 `small-temporary-file-directory'."
2687 (not (or (let ((comp (compare-strings temporary-file-directory
0 nil
2689 ;; Directory is under temporary-file-directory.
2690 (and (not (eq comp t
))
2691 (< comp
(- (length temporary-file-directory
)))))
2692 (if small-temporary-file-directory
2693 (let ((comp (compare-strings small-temporary-file-directory
2696 ;; Directory is under small-temporary-file-directory.
2697 (and (not (eq comp t
))
2698 (< comp
(- (length small-temporary-file-directory
)))))))))
2700 (defun make-backup-file-name (file)
2701 "Create the non-numeric backup file name for FILE.
2702 Normally this will just be the file's name with `~' appended.
2703 Customization hooks are provided as follows.
2705 If the variable `make-backup-file-name-function' is non-nil, its value
2706 should be a function which will be called with FILE as its argument;
2707 the resulting name is used.
2709 Otherwise a match for FILE is sought in `backup-directory-alist'; see
2710 the documentation of that variable. If the directory for the backup
2711 doesn't exist, it is created."
2712 (if make-backup-file-name-function
2713 (funcall make-backup-file-name-function file
)
2714 (if (and (eq system-type
'ms-dos
)
2715 (not (msdos-long-file-names)))
2716 (let ((fn (file-name-nondirectory file
)))
2717 (concat (file-name-directory file
)
2718 (or (and (string-match "\\`[^.]+\\'" fn
)
2719 (concat (match-string 0 fn
) ".~"))
2720 (and (string-match "\\`[^.]+\\.\\(..?\\)?" fn
)
2721 (concat (match-string 0 fn
) "~")))))
2722 (concat (make-backup-file-name-1 file
) "~"))))
2724 (defun make-backup-file-name-1 (file)
2725 "Subroutine of `make-backup-file-name' and `find-backup-file-name'."
2726 (let ((alist backup-directory-alist
)
2727 elt backup-directory
)
2729 (setq elt
(pop alist
))
2730 (if (string-match (car elt
) file
)
2731 (setq backup-directory
(cdr elt
)
2733 (if (and backup-directory
(not (file-exists-p backup-directory
)))
2735 (make-directory backup-directory
'parents
)
2736 (file-error (setq backup-directory nil
))))
2737 (if (null backup-directory
)
2739 (if (file-name-absolute-p backup-directory
)
2741 (when (memq system-type
'(windows-nt ms-dos cygwin
))
2742 ;; Normalize DOSish file names: downcase the drive
2743 ;; letter, if any, and replace the leading "x:" with
2745 (or (file-name-absolute-p file
)
2746 (setq file
(expand-file-name file
))) ; make defaults explicit
2747 ;; Replace any invalid file-name characters (for the
2748 ;; case of backing up remote files).
2749 (setq file
(expand-file-name (convert-standard-filename file
)))
2750 (if (eq (aref file
1) ?
:)
2751 (setq file
(concat "/"
2753 (char-to-string (downcase (aref file
0)))
2754 (if (eq (aref file
2) ?
/)
2757 (substring file
2)))))
2758 ;; Make the name unique by substituting directory
2759 ;; separators. It may not really be worth bothering about
2760 ;; doubling `!'s in the original name...
2762 (subst-char-in-string
2764 (replace-regexp-in-string "!" "!!" file
))
2766 (expand-file-name (file-name-nondirectory file
)
2767 (file-name-as-directory
2768 (expand-file-name backup-directory
2769 (file-name-directory file
))))))))
2771 (defun backup-file-name-p (file)
2772 "Return non-nil if FILE is a backup file name (numeric or not).
2773 This is a separate function so you can redefine it for customization.
2774 You may need to redefine `file-name-sans-versions' as well."
2775 (string-match "~\\'" file
))
2777 (defvar backup-extract-version-start
)
2779 ;; This is used in various files.
2780 ;; The usage of backup-extract-version-start is not very clean,
2781 ;; but I can't see a good alternative, so as of now I am leaving it alone.
2782 (defun backup-extract-version (fn)
2783 "Given the name of a numeric backup file, FN, return the backup number.
2784 Uses the free variable `backup-extract-version-start', whose value should be
2785 the index in the name where the version number begins."
2786 (if (and (string-match "[0-9]+~$" fn backup-extract-version-start
)
2787 (= (match-beginning 0) backup-extract-version-start
))
2788 (string-to-int (substring fn backup-extract-version-start -
1))
2791 ;; I believe there is no need to alter this behavior for VMS;
2792 ;; since backup files are not made on VMS, it should not get called.
2793 (defun find-backup-file-name (fn)
2794 "Find a file name for a backup file FN, and suggestions for deletions.
2795 Value is a list whose car is the name for the backup file
2796 and whose cdr is a list of old versions to consider deleting now.
2797 If the value is nil, don't make a backup.
2798 Uses `backup-directory-alist' in the same way as does
2799 `make-backup-file-name'."
2800 (let ((handler (find-file-name-handler fn
'find-backup-file-name
)))
2801 ;; Run a handler for this function so that ange-ftp can refuse to do it.
2803 (funcall handler
'find-backup-file-name fn
)
2804 (if (or (eq version-control
'never
)
2805 ;; We don't support numbered backups on plain MS-DOS
2806 ;; when long file names are unavailable.
2807 (and (eq system-type
'ms-dos
)
2808 (not (msdos-long-file-names))))
2809 (list (make-backup-file-name fn
))
2810 (let* ((basic-name (make-backup-file-name-1 fn
))
2811 (base-versions (concat (file-name-nondirectory basic-name
)
2813 (backup-extract-version-start (length base-versions
))
2815 (number-to-delete 0)
2816 possibilities deserve-versions-p versions
)
2818 (setq possibilities
(file-name-all-completions
2820 (file-name-directory basic-name
))
2821 versions
(sort (mapcar #'backup-extract-version
2824 high-water-mark
(apply 'max
0 versions
)
2825 deserve-versions-p
(or version-control
2826 (> high-water-mark
0))
2827 number-to-delete
(- (length versions
)
2831 (file-error (setq possibilities nil
)))
2832 (if (not deserve-versions-p
)
2833 (list (make-backup-file-name fn
))
2834 (cons (format "%s.~%d~" basic-name
(1+ high-water-mark
))
2835 (if (and (> number-to-delete
0)
2836 ;; Delete nothing if there is overflow
2837 ;; in the number of versions to keep.
2838 (>= (+ kept-new-versions kept-old-versions -
1) 0))
2840 (format "%s.~%d~" basic-name n
))
2841 (let ((v (nthcdr kept-old-versions versions
)))
2842 (rplacd (nthcdr (1- number-to-delete
) v
) ())
2845 (defun file-nlinks (filename)
2846 "Return number of names file FILENAME has."
2847 (car (cdr (file-attributes filename
))))
2849 ;; (defun file-relative-name (filename &optional directory)
2850 ;; "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
2851 ;; This function returns a relative file name which is equivalent to FILENAME
2852 ;; when used with that default directory as the default.
2853 ;; If this is impossible (which can happen on MSDOS and Windows
2854 ;; when the file name and directory use different drive names)
2855 ;; then it returns FILENAME."
2857 ;; (let ((fname (expand-file-name filename)))
2858 ;; (setq directory (file-name-as-directory
2859 ;; (expand-file-name (or directory default-directory))))
2860 ;; ;; On Microsoft OSes, if FILENAME and DIRECTORY have different
2861 ;; ;; drive names, they can't be relative, so return the absolute name.
2862 ;; (if (and (or (eq system-type 'ms-dos)
2863 ;; (eq system-type 'cygwin)
2864 ;; (eq system-type 'windows-nt))
2865 ;; (not (string-equal (substring fname 0 2)
2866 ;; (substring directory 0 2))))
2868 ;; (let ((ancestor ".")
2869 ;; (fname-dir (file-name-as-directory fname)))
2870 ;; (while (and (not (string-match (concat "^" (regexp-quote directory)) fname-dir))
2871 ;; (not (string-match (concat "^" (regexp-quote directory)) fname)))
2872 ;; (setq directory (file-name-directory (substring directory 0 -1))
2873 ;; ancestor (if (equal ancestor ".")
2875 ;; (concat "../" ancestor))))
2876 ;; ;; Now ancestor is empty, or .., or ../.., etc.
2877 ;; (if (string-match (concat "^" (regexp-quote directory)) fname)
2878 ;; ;; We matched within FNAME's directory part.
2879 ;; ;; Add the rest of FNAME onto ANCESTOR.
2880 ;; (let ((rest (substring fname (match-end 0))))
2881 ;; (if (and (equal ancestor ".")
2882 ;; (not (equal rest "")))
2883 ;; ;; But don't bother with ANCESTOR if it would give us `./'.
2885 ;; (concat (file-name-as-directory ancestor) rest)))
2886 ;; ;; We matched FNAME's directory equivalent.
2889 (defun file-relative-name (filename &optional directory
)
2890 "Convert FILENAME to be relative to DIRECTORY (default: `default-directory').
2891 This function returns a relative file name which is equivalent to FILENAME
2892 when used with that default directory as the default.
2893 If FILENAME and DIRECTORY lie on different machines or on different drives
2894 on a DOS/Windows machine, it returns FILENAME on expanded form."
2897 (file-name-as-directory (expand-file-name (or directory
2898 default-directory
))))
2899 (setq filename
(expand-file-name filename
))
2900 (let ((hf (find-file-name-handler filename
'file-local-copy
))
2901 (hd (find-file-name-handler directory
'file-local-copy
)))
2902 (when (and hf
(not (get hf
'file-remote-p
))) (setq hf nil
))
2903 (when (and hd
(not (get hd
'file-remote-p
))) (setq hd nil
))
2904 (if ;; Conditions for separate trees
2906 ;; Test for different drives on DOS/Windows
2908 (memq system-type
'(ms-dos cygwin windows-nt
))
2909 (not (string-equal (substring filename
0 2)
2910 (substring directory
0 2))))
2911 ;; Test for different remote file handlers
2913 ;; Test for different remote file system identification
2916 (let ((re (car (rassq hf file-name-handler-alist
))))
2920 (string-match re filename
)
2921 (substring filename
0 (match-end 0)))
2923 (string-match re directory
)
2924 (substring directory
0 (match-end 0))))))))
2926 (let ((ancestor ".")
2927 (filename-dir (file-name-as-directory filename
)))
2930 (not (string-match (concat "\\`" (regexp-quote directory
))
2932 (not (string-match (concat "\\`" (regexp-quote directory
))
2934 (setq directory
(file-name-directory (substring directory
0 -
1))
2935 ancestor
(if (equal ancestor
".")
2937 (concat "../" ancestor
))))
2938 ;; Now ancestor is empty, or .., or ../.., etc.
2939 (if (string-match (concat "^" (regexp-quote directory
)) filename
)
2940 ;; We matched within FILENAME's directory part.
2941 ;; Add the rest of FILENAME onto ANCESTOR.
2942 (let ((rest (substring filename
(match-end 0))))
2943 (if (and (equal ancestor
".") (not (equal rest
"")))
2944 ;; But don't bother with ANCESTOR if it would give us `./'.
2946 (concat (file-name-as-directory ancestor
) rest
)))
2947 ;; We matched FILENAME's directory equivalent.
2950 (defun save-buffer (&optional args
)
2951 "Save current buffer in visited file if modified. Versions described below.
2952 By default, makes the previous version into a backup file
2953 if previously requested or if this is the first save.
2954 With 1 \\[universal-argument], marks this version
2955 to become a backup when the next save is done.
2956 With 2 \\[universal-argument]'s,
2957 unconditionally makes the previous version into a backup file.
2958 With 3 \\[universal-argument]'s, marks this version
2959 to become a backup when the next save is done,
2960 and unconditionally makes the previous version into a backup file.
2962 With argument of 0, never make the previous version into a backup file.
2964 If a file's name is FOO, the names of its numbered backup versions are
2965 FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
2966 Numeric backups (rather than FOO~) will be made if value of
2967 `version-control' is not the atom `never' and either there are already
2968 numeric versions of the file being backed up, or `version-control' is
2970 We don't want excessive versions piling up, so there are variables
2971 `kept-old-versions', which tells Emacs how many oldest versions to keep,
2972 and `kept-new-versions', which tells how many newest versions to keep.
2973 Defaults are 2 old versions and 2 new.
2974 `dired-kept-versions' controls dired's clean-directory (.) command.
2975 If `delete-old-versions' is nil, system will query user
2976 before trimming versions. Otherwise it does it silently.
2978 If `vc-make-backup-files' is nil, which is the default,
2979 no backup files are made for files managed by version control.
2980 (This is because the version control system itself records previous versions.)
2982 See the subroutine `basic-save-buffer' for more information."
2984 (let ((modp (buffer-modified-p))
2985 (large (> (buffer-size) 50000))
2986 (make-backup-files (or (and make-backup-files
(not (eq args
0)))
2987 (memq args
'(16 64)))))
2988 (and modp
(memq args
'(16 64)) (setq buffer-backed-up nil
))
2989 (if (and modp large
(buffer-file-name))
2990 (message "Saving file %s..." (buffer-file-name)))
2992 (and modp
(memq args
'(4 64)) (setq buffer-backed-up nil
))))
2994 (defun delete-auto-save-file-if-necessary (&optional force
)
2995 "Delete auto-save file for current buffer if `delete-auto-save-files' is t.
2996 Normally delete only if the file was written by this Emacs since
2997 the last real save, but optional arg FORCE non-nil means delete anyway."
2998 (and buffer-auto-save-file-name delete-auto-save-files
2999 (not (string= buffer-file-name buffer-auto-save-file-name
))
3000 (or force
(recent-auto-save-p))
3003 (delete-file buffer-auto-save-file-name
)
3005 (set-buffer-auto-saved))))
3007 (defvar auto-save-hook nil
3008 "Normal hook run just before auto-saving.")
3010 (defcustom before-save-hook nil
3011 "Normal hook that is run before a buffer is saved to its file."
3012 :options
'(copyright-update)
3016 (defcustom after-save-hook nil
3017 "Normal hook that is run after a buffer is saved to its file."
3018 :options
'(executable-make-buffer-file-executable-if-script-p)
3022 (defvar save-buffer-coding-system nil
3023 "If non-nil, use this coding system for saving the buffer.
3024 More precisely, use this coding system in place of the
3025 value of `buffer-file-coding-system', when saving the buffer.
3026 Calling `write-region' for any purpose other than saving the buffer
3027 will still use `buffer-file-coding-system'; this variable has no effect
3030 (make-variable-buffer-local 'save-buffer-coding-system
)
3031 (put 'save-buffer-coding-system
'permanent-local t
)
3033 (defun basic-save-buffer ()
3034 "Save the current buffer in its visited file, if it has been modified.
3035 The hooks `write-contents-functions' and `write-file-functions' get a chance
3036 to do the job of saving; if they do not, then the buffer is saved in
3037 the visited file file in the usual way.
3038 Before and after saving the buffer, this function runs
3039 `before-save-hook' and `after-save-hook', respectively."
3041 (save-current-buffer
3042 ;; In an indirect buffer, save its base buffer instead.
3043 (if (buffer-base-buffer)
3044 (set-buffer (buffer-base-buffer)))
3045 (if (buffer-modified-p)
3046 (let ((recent-save (recent-auto-save-p))
3048 ;; On VMS, rename file and buffer to get rid of version number.
3049 (if (and (eq system-type
'vax-vms
)
3050 (not (string= buffer-file-name
3051 (file-name-sans-versions buffer-file-name
))))
3052 (let (buffer-new-name)
3053 ;; Strip VMS version number before save.
3054 (setq buffer-file-name
3055 (file-name-sans-versions buffer-file-name
))
3056 ;; Construct a (unique) buffer name to correspond.
3057 (let ((buf (create-file-buffer (downcase buffer-file-name
))))
3058 (setq buffer-new-name
(buffer-name buf
))
3060 (rename-buffer buffer-new-name
)))
3061 ;; If buffer has no file name, ask user for one.
3062 (or buffer-file-name
3065 (read-file-name "File to save in: ") nil
)))
3066 (and (file-exists-p filename
)
3067 (or (y-or-n-p (format "File `%s' exists; overwrite? "
3069 (error "Canceled")))
3070 (set-visited-file-name filename
)))
3071 (or (verify-visited-file-modtime (current-buffer))
3072 (not (file-exists-p buffer-file-name
))
3074 (format "%s has changed since visited or saved. Save anyway? "
3075 (file-name-nondirectory buffer-file-name
)))
3076 (error "Save not confirmed"))
3080 (and (> (point-max) (point-min))
3081 (not find-file-literally
)
3082 (/= (char-after (1- (point-max))) ?
\n)
3083 (not (and (eq selective-display t
)
3084 (= (char-after (1- (point-max))) ?
\r)))
3085 (or (eq require-final-newline t
)
3086 (and require-final-newline
3088 (format "Buffer %s does not end in newline. Add one? "
3091 (goto-char (point-max))
3093 ;; Support VC version backups.
3095 (run-hooks 'before-save-hook
)
3096 (or (run-hook-with-args-until-success 'write-contents-functions
)
3097 (run-hook-with-args-until-success 'local-write-file-hooks
)
3098 (run-hook-with-args-until-success 'write-file-functions
)
3099 ;; If a hook returned t, file is already "written".
3100 ;; Otherwise, write it the usual way now.
3101 (setq setmodes
(basic-save-buffer-1)))
3102 ;; Now we have saved the current buffer. Let's make sure
3103 ;; that buffer-file-coding-system is fixed to what
3104 ;; actually used for saving by binding it locally.
3105 (if save-buffer-coding-system
3106 (setq save-buffer-coding-system last-coding-system-used
)
3107 (setq buffer-file-coding-system last-coding-system-used
))
3108 (setq buffer-file-number
3109 (nthcdr 10 (file-attributes buffer-file-name
)))
3112 (set-file-modes buffer-file-name
(car setmodes
))
3114 ;; If the auto-save file was recent before this command,
3116 (delete-auto-save-file-if-necessary recent-save
)
3117 ;; Support VC `implicit' locking.
3119 (run-hooks 'after-save-hook
))
3120 (message "(No changes need to be saved)"))))
3122 ;; This does the "real job" of writing a buffer into its visited file
3123 ;; and making a backup file. This is what is normally done
3124 ;; but inhibited if one of write-file-functions returns non-nil.
3125 ;; It returns a value (MODES . BACKUPNAME), like backup-buffer.
3126 (defun basic-save-buffer-1 ()
3127 (if save-buffer-coding-system
3128 (let ((coding-system-for-write save-buffer-coding-system
))
3129 (basic-save-buffer-2))
3130 (basic-save-buffer-2)))
3132 ;; This returns a value (MODES . BACKUPNAME), like backup-buffer.
3133 (defun basic-save-buffer-2 ()
3134 (let (tempsetmodes setmodes
)
3135 (if (not (file-writable-p buffer-file-name
))
3136 (let ((dir (file-name-directory buffer-file-name
)))
3137 (if (not (file-directory-p dir
))
3138 (if (file-exists-p dir
)
3139 (error "%s is not a directory" dir
)
3140 (error "%s: no such directory" buffer-file-name
))
3141 (if (not (file-exists-p buffer-file-name
))
3142 (error "Directory %s write-protected" dir
)
3144 (format "File %s is write-protected; try to save anyway? "
3145 (file-name-nondirectory
3147 (setq tempsetmodes t
)
3148 (error "Attempt to save to a file which you aren't allowed to write"))))))
3149 (or buffer-backed-up
3150 (setq setmodes
(backup-buffer)))
3151 (let ((dir (file-name-directory buffer-file-name
)))
3152 (if (and file-precious-flag
3153 (file-writable-p dir
))
3154 ;; If file is precious, write temp name, then rename it.
3155 ;; This requires write access to the containing dir,
3156 ;; which is why we don't try it if we don't have that access.
3157 (let ((realname buffer-file-name
)
3158 tempname nogood i succeed
3159 (old-modtime (visited-file-modtime)))
3162 ;; Find the temporary name to write under.
3164 (setq tempname
(format
3165 (if (and (eq system-type
'ms-dos
)
3166 (not (msdos-long-file-names)))
3167 "%s#%d.tm#" ; MSDOS limits files to 8+3
3168 (if (memq system-type
'(vax-vms axp-vms
))
3172 (setq nogood
(file-exists-p tempname
))
3175 (progn (clear-visited-file-modtime)
3176 (write-region (point-min) (point-max)
3177 tempname nil realname
3178 buffer-file-truename
)
3180 ;; If writing the temp file fails,
3181 ;; delete the temp file.
3185 (delete-file tempname
)
3187 (set-visited-file-modtime old-modtime
))))
3188 ;; Since we have created an entirely new file
3189 ;; and renamed it, make sure it gets the
3190 ;; right permission bits set.
3191 (setq setmodes
(or setmodes
(cons (file-modes buffer-file-name
)
3193 ;; We succeeded in writing the temp file,
3195 (rename-file tempname buffer-file-name t
))
3196 ;; If file not writable, see if we can make it writable
3197 ;; temporarily while we write it.
3198 ;; But no need to do so if we have just backed it up
3199 ;; (setmodes is set) because that says we're superseding.
3200 (cond ((and tempsetmodes
(not setmodes
))
3201 ;; Change the mode back, after writing.
3202 (setq setmodes
(cons (file-modes buffer-file-name
) buffer-file-name
))
3203 (set-file-modes buffer-file-name
(logior (car setmodes
) 128))))
3207 (write-region (point-min) (point-max)
3208 buffer-file-name nil t buffer-file-truename
)
3210 ;; If we get an error writing the new file, and we made
3211 ;; the backup by renaming, undo the backing-up.
3212 (and setmodes
(not success
)
3213 (rename-file (cdr setmodes
) buffer-file-name
))))))
3216 (defun diff-buffer-with-file (&optional buffer
)
3217 "View the differences between BUFFER and its associated file.
3218 This requires the external program `diff' to be in your `exec-path'."
3219 (interactive "bBuffer: ")
3220 (with-current-buffer (get-buffer (or buffer
(current-buffer)))
3221 (if (and buffer-file-name
3222 (file-exists-p buffer-file-name
))
3223 (let ((tempfile (make-temp-file "buffer-content-")))
3227 (write-region (point-min) (point-max) tempfile nil
'nomessage
)
3228 (diff buffer-file-name tempfile nil t
)
3230 (when (file-exists-p tempfile
)
3231 (delete-file tempfile
))))
3232 (message "Buffer %s has no associated file on disc" (buffer-name))
3233 ;; Display that message for 1 second so that user can read it
3234 ;; in the minibuffer.
3236 ;; return always nil, so that save-buffers-kill-emacs will not move
3237 ;; over to the next unsaved buffer when calling `d'.
3240 (defvar save-some-buffers-action-alist
3245 (exit-recursive-edit)))
3247 ;; Return nil to ask about BUF again.
3249 "display the current buffer")
3250 (?d diff-buffer-with-file
3251 "show difference to last saved version"))
3252 "ACTION-ALIST argument used in call to `map-y-or-n-p'.")
3253 (put 'save-some-buffers-action-alist
'risky-local-variable t
)
3255 (defun save-some-buffers (&optional arg pred
)
3256 "Save some modified file-visiting buffers. Asks user about each one.
3257 You can answer `y' to save, `n' not to save, `C-r' to look at the
3258 buffer in question with `view-buffer' before deciding or `d' to
3259 view the differences using `diff-buffer-to-file'.
3261 Optional argument (the prefix) non-nil means save all with no questions.
3262 Optional second argument PRED determines which buffers are considered:
3263 If PRED is nil, all the file-visiting buffers are considered.
3264 If PRED is t, then certain non-file buffers will also be considered.
3265 If PRED is a zero-argument function, it indicates for each buffer whether
3266 to consider it or not when called with that buffer current.
3268 See `save-some-buffers-action-alist' if you want to
3269 change the additional actions you can take on files."
3271 (save-window-excursion
3272 (let* ((queried nil
)
3277 (and (buffer-modified-p buffer
)
3278 (not (buffer-base-buffer buffer
))
3280 (buffer-file-name buffer
)
3284 (and buffer-offer-save
(> (buffer-size) 0)))))
3285 (or (not (functionp pred
))
3286 (with-current-buffer buffer
(funcall pred
)))
3290 (if (buffer-file-name buffer
)
3291 (format "Save file %s? "
3292 (buffer-file-name buffer
))
3293 (format "Save buffer %s? "
3294 (buffer-name buffer
)))))))
3300 '("buffer" "buffers" "save")
3301 save-some-buffers-action-alist
))
3303 (and save-abbrevs abbrevs-changed
3306 (eq save-abbrevs
'silently
)
3307 (y-or-n-p (format "Save abbrevs in %s? "
3309 (write-abbrev-file nil
))
3310 ;; Don't keep bothering user if he says no.
3311 (setq abbrevs-changed nil
)
3313 (or queried
(> files-done
0) abbrevs-done
3314 (message "(No files need saving)")))))
3316 (defun not-modified (&optional arg
)
3317 "Mark current buffer as unmodified, not needing to be saved.
3318 With prefix arg, mark buffer as modified, so \\[save-buffer] will save.
3320 It is not a good idea to use this function in Lisp programs, because it
3321 prints a message in the minibuffer. Instead, use `set-buffer-modified-p'."
3323 (message (if arg
"Modification-flag set"
3324 "Modification-flag cleared"))
3325 (set-buffer-modified-p arg
))
3327 (defun toggle-read-only (&optional arg
)
3328 "Change whether this buffer is visiting its file read-only.
3329 With arg, set read-only iff arg is positive.
3330 If visiting file read-only and `view-read-only' is non-nil, enter view mode."
3333 (if (> (prefix-numeric-value arg
) 0) buffer-read-only
3334 (not buffer-read-only
))) ; If buffer-read-only is set correctly,
3338 ((and buffer-read-only view-mode
)
3339 (View-exit-and-edit)
3340 (make-local-variable 'view-read-only
)
3341 (setq view-read-only t
)) ; Must leave view mode.
3342 ((and (not buffer-read-only
) view-read-only
3343 ;; If view-mode is already active, `view-mode-enter' is a nop.
3345 (not (eq (get major-mode
'mode-class
) 'special
)))
3347 (t (setq buffer-read-only
(not buffer-read-only
))
3348 (force-mode-line-update)))
3349 (if (vc-backend buffer-file-name
)
3350 (message (substitute-command-keys
3351 (concat "File is under version-control; "
3352 "use \\[vc-next-action] to check in/out"))))))
3354 (defun insert-file (filename)
3355 "Insert contents of file FILENAME into buffer after point.
3356 Set mark after the inserted text.
3358 This function is meant for the user to run interactively.
3359 Don't call it from programs! Use `insert-file-contents' instead.
3360 \(Its calling sequence is different; see its documentation)."
3361 (interactive "*fInsert file: ")
3362 (insert-file-1 filename
#'insert-file-contents
))
3364 (defun append-to-file (start end filename
)
3365 "Append the contents of the region to the end of file FILENAME.
3366 When called from a function, expects three arguments,
3367 START, END and FILENAME. START and END are buffer positions
3368 saying what text to write."
3369 (interactive "r\nFAppend to file: ")
3370 (write-region start end filename t
))
3372 (defun file-newest-backup (filename)
3373 "Return most recent backup file for FILENAME or nil if no backups exist."
3374 ;; `make-backup-file-name' will get us the right directory for
3375 ;; ordinary or numeric backups. It might create a directory for
3376 ;; backups as a side-effect, according to `backup-directory-alist'.
3377 (let* ((filename (file-name-sans-versions
3378 (make-backup-file-name (expand-file-name filename
))))
3379 (file (file-name-nondirectory filename
))
3380 (dir (file-name-directory filename
))
3381 (comp (file-name-all-completions file dir
))
3385 (setq tem
(pop comp
))
3386 (cond ((and (backup-file-name-p tem
)
3387 (string= (file-name-sans-versions tem
) file
))
3388 (setq tem
(concat dir tem
))
3389 (if (or (null newest
)
3390 (file-newer-than-file-p tem newest
))
3391 (setq newest tem
)))))
3394 (defun rename-uniquely ()
3395 "Rename current buffer to a similar name not already taken.
3396 This function is useful for creating multiple shell process buffers
3397 or multiple mail buffers, etc."
3400 (let ((base-name (buffer-name)))
3401 (and (string-match "<[0-9]+>\\'" base-name
)
3402 (not (and buffer-file-name
3404 (file-name-nondirectory buffer-file-name
))))
3405 ;; If the existing buffer name has a <NNN>,
3406 ;; which isn't part of the file name (if any),
3407 ;; then get rid of that.
3408 (setq base-name
(substring base-name
0 (match-beginning 0))))
3409 (rename-buffer (generate-new-buffer-name base-name
))
3410 (force-mode-line-update))))
3412 (defun make-directory (dir &optional parents
)
3413 "Create the directory DIR and any nonexistent parent dirs.
3414 Interactively, the default choice of directory to create
3415 is the current default directory for file names.
3416 That is useful when you have visited a file in a nonexistent directory.
3418 Noninteractively, the second (optional) argument PARENTS says whether
3419 to create parent directories if they don't exist. Interactively,
3420 this happens by default."
3422 (list (read-file-name "Make directory: " default-directory default-directory
3425 ;; If default-directory is a remote directory,
3426 ;; make sure we find its make-directory handler.
3427 (setq dir
(expand-file-name dir
))
3428 (let ((handler (find-file-name-handler dir
'make-directory
)))
3430 (funcall handler
'make-directory dir parents
)
3432 (make-directory-internal dir
)
3433 (let ((dir (directory-file-name (expand-file-name dir
)))
3435 (while (not (file-exists-p dir
))
3436 (setq create-list
(cons dir create-list
)
3437 dir
(directory-file-name (file-name-directory dir
))))
3439 (make-directory-internal (car create-list
))
3440 (setq create-list
(cdr create-list
))))))))
3442 (put 'revert-buffer-function
'permanent-local t
)
3443 (defvar revert-buffer-function nil
3444 "Function to use to revert this buffer, or nil to do the default.
3445 The function receives two arguments IGNORE-AUTO and NOCONFIRM,
3446 which are the arguments that `revert-buffer' received.")
3448 (put 'revert-buffer-insert-file-contents-function
'permanent-local t
)
3449 (defvar revert-buffer-insert-file-contents-function nil
3450 "Function to use to insert contents when reverting this buffer.
3451 Gets two args, first the nominal file name to use,
3452 and second, t if reading the auto-save file.
3454 The function you specify is responsible for updating (or preserving) point.")
3456 (defvar before-revert-hook nil
3457 "Normal hook for `revert-buffer' to run before reverting.
3458 If `revert-buffer-function' is used to override the normal revert
3459 mechanism, this hook is not used.")
3461 (defvar after-revert-hook nil
3462 "Normal hook for `revert-buffer' to run after reverting.
3463 Note that the hook value that it runs is the value that was in effect
3464 before reverting; that makes a difference if you have buffer-local
3467 If `revert-buffer-function' is used to override the normal revert
3468 mechanism, this hook is not used.")
3470 (defvar revert-buffer-internal-hook
)
3472 (defun revert-buffer (&optional ignore-auto noconfirm preserve-modes
)
3473 "Replace current buffer text with the text of the visited file on disk.
3474 This undoes all changes since the file was visited or saved.
3475 With a prefix argument, offer to revert from latest auto-save file, if
3476 that is more recent than the visited file.
3478 This command also works for special buffers that contain text which
3479 doesn't come from a file, but reflects some other data base instead:
3480 for example, Dired buffers and `buffer-list' buffers. In these cases,
3481 it reconstructs the buffer contents from the appropriate data base.
3483 When called from Lisp, the first argument is IGNORE-AUTO; only offer
3484 to revert from the auto-save file when this is nil. Note that the
3485 sense of this argument is the reverse of the prefix argument, for the
3486 sake of backward compatibility. IGNORE-AUTO is optional, defaulting
3489 Optional second argument NOCONFIRM means don't ask for confirmation at
3490 all. (The local variable `revert-without-query', if non-nil, prevents
3493 Optional third argument PRESERVE-MODES non-nil means don't alter
3494 the files modes. Normally we reinitialize them using `normal-mode'.
3496 If the value of `revert-buffer-function' is non-nil, it is called to
3497 do all the work for this command. Otherwise, the hooks
3498 `before-revert-hook' and `after-revert-hook' are run at the beginning
3499 and the end, and if `revert-buffer-insert-file-contents-function' is
3500 non-nil, it is called instead of rereading visited file contents."
3502 ;; I admit it's odd to reverse the sense of the prefix argument, but
3503 ;; there is a lot of code out there which assumes that the first
3504 ;; argument should be t to avoid consulting the auto-save file, and
3505 ;; there's no straightforward way to encourage authors to notice a
3506 ;; reversal of the argument sense. So I'm just changing the user
3507 ;; interface, but leaving the programmatic interface the same.
3508 (interactive (list (not current-prefix-arg
)))
3509 (if revert-buffer-function
3510 (funcall revert-buffer-function ignore-auto noconfirm
)
3511 (let* ((auto-save-p (and (not ignore-auto
)
3512 (recent-auto-save-p)
3513 buffer-auto-save-file-name
3514 (file-readable-p buffer-auto-save-file-name
)
3516 "Buffer has been auto-saved recently. Revert from auto-save file? ")))
3517 (file-name (if auto-save-p
3518 buffer-auto-save-file-name
3520 (cond ((null file-name
)
3521 (error "Buffer does not seem to be associated with any file"))
3523 (and (not (buffer-modified-p))
3524 (let ((tail revert-without-query
)
3527 (if (string-match (car tail
) file-name
)
3529 (setq tail
(cdr tail
)))
3531 (yes-or-no-p (format "Revert buffer from file %s? "
3533 (run-hooks 'before-revert-hook
)
3534 ;; If file was backed up but has changed since,
3535 ;; we shd make another backup.
3536 (and (not auto-save-p
)
3537 (not (verify-visited-file-modtime (current-buffer)))
3538 (setq buffer-backed-up nil
))
3539 ;; Get rid of all undo records for this buffer.
3540 (or (eq buffer-undo-list t
)
3541 (setq buffer-undo-list nil
))
3542 ;; Effectively copy the after-revert-hook status,
3543 ;; since after-find-file will clobber it.
3544 (let ((global-hook (default-value 'after-revert-hook
))
3545 (local-hook-p (local-variable-p 'after-revert-hook
))
3546 (local-hook (and (local-variable-p 'after-revert-hook
)
3547 after-revert-hook
)))
3548 (let (buffer-read-only
3549 ;; Don't make undo records for the reversion.
3550 (buffer-undo-list t
))
3551 (if revert-buffer-insert-file-contents-function
3552 (funcall revert-buffer-insert-file-contents-function
3553 file-name auto-save-p
)
3554 (if (not (file-exists-p file-name
))
3555 (error (if buffer-file-number
3556 "File %s no longer exists!"
3557 "Cannot revert nonexistent file %s")
3559 ;; Bind buffer-file-name to nil
3560 ;; so that we don't try to lock the file.
3561 (let ((buffer-file-name nil
))
3565 (let ((coding-system-for-read
3566 ;; Auto-saved file shoule be read without
3567 ;; any code conversion.
3568 (if auto-save-p
'emacs-mule-unix
3569 (or coding-system-for-read
3570 buffer-file-coding-system
))))
3571 ;; This force after-insert-file-set-coding
3572 ;; (called from insert-file-contents) to set
3573 ;; buffer-file-coding-system to a proper value.
3574 (kill-local-variable 'buffer-file-coding-system
)
3576 ;; Note that this preserves point in an intelligent way.
3578 (let ((buffer-file-format buffer-file-format
))
3579 (insert-file-contents file-name
(not auto-save-p
)
3581 (insert-file-contents file-name
(not auto-save-p
)
3583 ;; Recompute the truename in case changes in symlinks
3584 ;; have changed the truename.
3585 (setq buffer-file-truename
3586 (abbreviate-file-name (file-truename buffer-file-name
)))
3587 (after-find-file nil nil t t preserve-modes
)
3588 ;; Run after-revert-hook as it was before we reverted.
3589 (setq-default revert-buffer-internal-hook global-hook
)
3591 (set (make-local-variable 'revert-buffer-internal-hook
)
3593 (kill-local-variable 'revert-buffer-internal-hook
))
3594 (run-hooks 'revert-buffer-internal-hook
))
3597 (defun recover-this-file ()
3598 "Recover the visited file--get contents from its last auto-save file."
3600 (recover-file buffer-file-name
))
3602 (defun recover-file (file)
3603 "Visit file FILE, but get contents from its last auto-save file."
3604 ;; Actually putting the file name in the minibuffer should be used
3606 ;; Not just because users often use the default.
3607 (interactive "FRecover file: ")
3608 (setq file
(expand-file-name file
))
3609 (if (auto-save-file-name-p (file-name-nondirectory file
))
3610 (error "%s is an auto-save file" (abbreviate-file-name file
)))
3611 (let ((file-name (let ((buffer-file-name file
))
3612 (make-auto-save-file-name))))
3613 (cond ((if (file-exists-p file
)
3614 (not (file-newer-than-file-p file-name file
))
3615 (not (file-exists-p file-name
)))
3616 (error "Auto-save file %s not current"
3617 (abbreviate-file-name file-name
)))
3618 ((save-window-excursion
3619 (with-output-to-temp-buffer "*Directory*"
3620 (buffer-disable-undo standard-output
)
3622 (let ((switches dired-listing-switches
))
3623 (if (file-symlink-p file
)
3624 (setq switches
(concat switches
"L")))
3625 (set-buffer standard-output
)
3626 ;; Use insert-directory-safely, not insert-directory,
3627 ;; because these files might not exist. In particular,
3628 ;; FILE might not exist if the auto-save file was for
3629 ;; a buffer that didn't visit a file, such as "*mail*".
3630 ;; The code in v20.x called `ls' directly, so we need
3631 ;; to emulate what `ls' did in that case.
3632 (insert-directory-safely file switches
)
3633 (insert-directory-safely file-name switches
))))
3634 (yes-or-no-p (format "Recover auto save file %s? " file-name
)))
3635 (switch-to-buffer (find-file-noselect file t
))
3636 (let ((buffer-read-only nil
)
3637 ;; Keep the current buffer-file-coding-system.
3638 (coding-system buffer-file-coding-system
)
3639 ;; Auto-saved file shoule be read with special coding.
3640 (coding-system-for-read 'auto-save-coding
))
3642 (insert-file-contents file-name nil
)
3643 (set-buffer-file-coding-system coding-system
))
3644 (after-find-file nil nil t
))
3645 (t (error "Recover-file cancelled")))))
3647 (defun recover-session ()
3648 "Recover auto save files from a previous Emacs session.
3649 This command first displays a Dired buffer showing you the
3650 previous sessions that you could recover from.
3651 To choose one, move point to the proper line and then type C-c C-c.
3652 Then you'll be asked about a number of files to recover."
3654 (if (null auto-save-list-file-prefix
)
3655 (error "You set `auto-save-list-file-prefix' to disable making session files"))
3656 (let ((dir (file-name-directory auto-save-list-file-prefix
)))
3657 (unless (file-directory-p dir
)
3658 (make-directory dir t
))
3659 (unless (directory-files dir nil
3660 (concat "\\`" (regexp-quote
3661 (file-name-nondirectory
3662 auto-save-list-file-prefix
)))
3664 (error "No previous sessions to recover")))
3665 (let ((ls-lisp-support-shell-wildcards t
))
3666 (dired (concat auto-save-list-file-prefix
"*")
3667 (concat dired-listing-switches
"t")))
3669 (goto-char (point-min))
3670 (or (looking-at " Move to the session you want to recover,")
3671 (let ((inhibit-read-only t
))
3672 ;; Each line starts with a space
3673 ;; so that Font Lock mode won't highlight the first character.
3674 (insert " Move to the session you want to recover,\n"
3675 " then type C-c C-c to select it.\n\n"
3676 " You can also delete some of these files;\n"
3677 " type d on a line to mark that file for deletion.\n\n"))))
3678 (use-local-map (nconc (make-sparse-keymap) (current-local-map)))
3679 (define-key (current-local-map) "\C-c\C-c" 'recover-session-finish
))
3681 (defun recover-session-finish ()
3682 "Choose one saved session to recover auto-save files from.
3683 This command is used in the special Dired buffer created by
3684 \\[recover-session]."
3686 ;; Get the name of the session file to recover from.
3687 (let ((file (dired-get-filename))
3689 (buffer (get-buffer-create " *recover*")))
3691 (dired-do-flagged-delete t
)
3694 ;; Read in the auto-save-list file.
3697 (insert-file-contents file
)
3698 ;; Loop thru the text of that file
3699 ;; and get out the names of the files to recover.
3701 (let (thisfile autofile
)
3703 ;; This is a pair of lines for a non-file-visiting buffer.
3704 ;; Get the auto-save file name and manufacture
3705 ;; a "visited file name" from that.
3708 ;; If there is no auto-save file name, the
3709 ;; auto-save-list file is probably corrupted.
3712 (buffer-substring-no-properties
3720 (file-name-nondirectory autofile
)
3722 (file-name-directory autofile
))))
3724 ;; This pair of lines is a file-visiting
3725 ;; buffer. Use the visited file name.
3728 (buffer-substring-no-properties
3729 (point) (progn (end-of-line) (point))))
3732 (buffer-substring-no-properties
3733 (point) (progn (end-of-line) (point))))
3735 ;; Ignore a file if its auto-save file does not exist now.
3736 (if (and autofile
(file-exists-p autofile
))
3737 (setq files
(cons thisfile files
)))))
3738 (setq files
(nreverse files
))
3739 ;; The file contains a pair of line for each auto-saved buffer.
3740 ;; The first line of the pair contains the visited file name
3741 ;; or is empty if the buffer was not visiting a file.
3742 ;; The second line is the auto-save file name.
3744 (map-y-or-n-p "Recover %s? "
3747 (save-excursion (recover-file file
))
3749 "Failed to recover `%s'" file
)))
3751 '("file" "files" "recover"))
3752 (message "No files can be recovered from this session now")))
3753 (kill-buffer buffer
))))
3755 (defun kill-some-buffers (&optional list
)
3756 "Kill some buffers. Asks the user whether to kill each one of them.
3757 Non-interactively, if optional argument LIST is non-`nil', it
3758 specifies the list of buffers to kill, asking for approval for each one."
3761 (setq list
(buffer-list)))
3763 (let* ((buffer (car list
))
3764 (name (buffer-name buffer
)))
3765 (and (not (string-equal name
""))
3766 (/= (aref name
0) ?
)
3768 (format "Buffer %s %s. Kill? "
3770 (if (buffer-modified-p buffer
)
3771 "HAS BEEN EDITED" "is unmodified")))
3772 (kill-buffer buffer
)))
3773 (setq list
(cdr list
))))
3775 (defun auto-save-mode (arg)
3776 "Toggle auto-saving of contents of current buffer.
3777 With prefix argument ARG, turn auto-saving on if positive, else off."
3779 (setq buffer-auto-save-file-name
3781 (or (not buffer-auto-save-file-name
)
3782 ;; If auto-save is off because buffer has shrunk,
3783 ;; then toggling should turn it on.
3784 (< buffer-saved-size
0))
3785 (or (eq arg t
) (listp arg
) (and (integerp arg
) (> arg
0))))
3786 (if (and buffer-file-name auto-save-visited-file-name
3787 (not buffer-read-only
))
3789 (make-auto-save-file-name))))
3790 ;; If -1 was stored here, to temporarily turn off saving,
3792 (and (< buffer-saved-size
0)
3793 (setq buffer-saved-size
0))
3795 (message "Auto-save %s (in this buffer)"
3796 (if buffer-auto-save-file-name
"on" "off")))
3797 buffer-auto-save-file-name
)
3799 (defun rename-auto-save-file ()
3800 "Adjust current buffer's auto save file name for current conditions.
3801 Also rename any existing auto save file, if it was made in this session."
3802 (let ((osave buffer-auto-save-file-name
))
3803 (setq buffer-auto-save-file-name
3804 (make-auto-save-file-name))
3805 (if (and osave buffer-auto-save-file-name
3806 (not (string= buffer-auto-save-file-name buffer-file-name
))
3807 (not (string= buffer-auto-save-file-name osave
))
3808 (file-exists-p osave
)
3809 (recent-auto-save-p))
3810 (rename-file osave buffer-auto-save-file-name t
))))
3812 (defun make-auto-save-file-name ()
3813 "Return file name to use for auto-saves of current buffer.
3814 Does not consider `auto-save-visited-file-name' as that variable is checked
3815 before calling this function. You can redefine this for customization.
3816 See also `auto-save-file-name-p'."
3817 (if buffer-file-name
3818 (let ((list auto-save-file-name-transforms
)
3819 (filename buffer-file-name
)
3821 ;; Apply user-specified translations
3822 ;; to the file name.
3823 (while (and list
(not result
))
3824 (if (string-match (car (car list
)) filename
)
3825 (setq result
(replace-match (cadr (car list
)) t nil
3827 uniq
(car (cddr (car list
)))))
3828 (setq list
(cdr list
)))
3831 (setq filename
(concat
3832 (file-name-directory result
)
3833 (subst-char-in-string
3835 (replace-regexp-in-string "!" "!!"
3837 (setq filename result
)))
3839 (if (and (eq system-type
'ms-dos
)
3840 (not (msdos-long-file-names)))
3841 ;; We truncate the file name to DOS 8+3 limits
3842 ;; before doing anything else, because the regexp
3843 ;; passed to string-match below cannot handle
3844 ;; extensions longer than 3 characters, multiple
3845 ;; dots, and other atrocities.
3846 (let ((fn (dos-8+3-filename
3847 (file-name-nondirectory buffer-file-name
))))
3849 "\\`\\([^.]+\\)\\(\\.\\(..?\\)?.?\\|\\)\\'"
3851 (concat (file-name-directory buffer-file-name
)
3852 "#" (match-string 1 fn
)
3853 "." (match-string 3 fn
) "#"))
3854 (concat (file-name-directory filename
)
3856 (file-name-nondirectory filename
)
3858 ;; Make sure auto-save file names don't contain characters
3859 ;; invalid for the underlying filesystem.
3860 (if (and (memq system-type
'(ms-dos windows-nt
))
3861 ;; Don't modify remote (ange-ftp) filenames
3862 (not (string-match "^/\\w+@[-A-Za-z0-9._]+:" result
)))
3863 (convert-standard-filename result
)
3866 ;; Deal with buffers that don't have any associated files. (Mail
3867 ;; mode tends to create a good number of these.)
3869 (let ((buffer-name (buffer-name))
3872 ;; Eliminate all slashes and backslashes by
3873 ;; replacing them with sequences that start with %.
3874 ;; Quote % also, to keep distinct names distinct.
3875 (while (string-match "[/\\%]" buffer-name limit
)
3876 (let* ((character (aref buffer-name
(match-beginning 0)))
3878 (cond ((eq character ?%
) "%%")
3879 ((eq character ?
/) "%+")
3880 ((eq character ?
\\) "%-"))))
3881 (setq buffer-name
(replace-match replacement t t buffer-name
))
3882 (setq limit
(1+ (match-end 0)))))
3883 ;; Generate the file name.
3888 (format "#%s#" buffer-name
)
3889 ;; Try a few alternative directories, to get one we can
3892 ((file-writable-p default-directory
) default-directory
)
3893 ((file-writable-p "/var/tmp/") "/var/tmp/")
3895 (if (and (memq system-type
'(ms-dos windows-nt
))
3896 ;; Don't modify remote (ange-ftp) filenames
3897 (not (string-match "^/\\w+@[-A-Za-z0-9._]+:" fname
)))
3898 ;; The call to convert-standard-filename is in case
3899 ;; buffer-name includes characters not allowed by the
3900 ;; DOS/Windows filesystems. make-temp-file writes to the
3901 ;; file it creates, so we must fix the file name _before_
3902 ;; make-temp-file is called.
3903 (convert-standard-filename fname
)
3906 ;; make-temp-file creates the file,
3907 ;; but we don't want it to exist until we do an auto-save.
3909 (delete-file file-name
)
3913 (defun auto-save-file-name-p (filename)
3914 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'.
3915 FILENAME should lack slashes. You can redefine this for customization."
3916 (string-match "^#.*#$" filename
))
3918 (defun wildcard-to-regexp (wildcard)
3919 "Given a shell file name pattern WILDCARD, return an equivalent regexp.
3920 The generated regexp will match a filename iff the filename
3921 matches that wildcard according to shell rules. Only wildcards known
3922 by `sh' are supported."
3923 (let* ((i (string-match "[[.*+\\^$?]" wildcard
))
3924 ;; Copy the initial run of non-special characters.
3925 (result (substring wildcard
0 i
))
3926 (len (length wildcard
)))
3927 ;; If no special characters, we're almost done.
3930 (let ((ch (aref wildcard i
))
3938 (eq (aref wildcard
(1+ i
)) ?\
]))
3940 ((eq ch ?\
[) ; [...] maps to regexp char class
3945 ((eq (aref wildcard i
) ?
!) ; [!...] -> [^...]
3948 (if (eq (aref wildcard i
) ?\
])
3953 ((eq (aref wildcard i
) ?^
)
3954 ;; Found "[^". Insert a `\0' character
3955 ;; (which cannot happen in a filename)
3956 ;; into the character class, so that `^'
3957 ;; is not the first character after `[',
3958 ;; and thus non-special in a regexp.
3962 ((eq (aref wildcard i
) ?\
])
3963 ;; I don't think `]' can appear in a
3964 ;; character class in a wildcard, but
3965 ;; let's be general here.
3970 (prog1 ; copy everything upto next `]'.
3973 (setq j
(string-match
3975 (setq i
(if j
(1- j
) (1- len
)))))))
3977 ((eq ch ?
*) "[^\000]*")
3981 ((eq ch ?
\\) "\\\\") ; probably cannot happen...
3982 ((eq ch ??
) "[^\000]")
3983 (t (char-to-string ch
)))))
3985 ;; Shell wildcards should match the entire filename,
3986 ;; not its part. Make the regexp say so.
3987 (concat "\\`" result
"\\'")))
3989 (defcustom list-directory-brief-switches
3990 (if (eq system-type
'vax-vms
) "" "-CF")
3991 "*Switches for `list-directory' to pass to `ls' for brief listing."
3995 (defcustom list-directory-verbose-switches
3996 (if (eq system-type
'vax-vms
)
3997 "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)"
3999 "*Switches for `list-directory' to pass to `ls' for verbose listing."
4003 (defun file-expand-wildcards (pattern &optional full
)
4004 "Expand wildcard pattern PATTERN.
4005 This returns a list of file names which match the pattern.
4007 If PATTERN is written as an absolute relative file name,
4008 the values are absolute also.
4010 If PATTERN is written as a relative file name, it is interpreted
4011 relative to the current default directory, `default-directory'.
4012 The file names returned are normally also relative to the current
4013 default directory. However, if FULL is non-nil, they are absolute."
4015 (let* ((nondir (file-name-nondirectory pattern
))
4016 (dirpart (file-name-directory pattern
))
4017 ;; A list of all dirs that DIRPART specifies.
4018 ;; This can be more than one dir
4019 ;; if DIRPART contains wildcards.
4020 (dirs (if (and dirpart
(string-match "[[*?]" dirpart
))
4021 (mapcar 'file-name-as-directory
4022 (file-expand-wildcards (directory-file-name dirpart
)))
4026 (when (or (null (car dirs
)) ; Possible if DIRPART is not wild.
4027 (file-directory-p (directory-file-name (car dirs
))))
4028 (let ((this-dir-contents
4029 ;; Filter out "." and ".."
4031 (mapcar #'(lambda (name)
4032 (unless (string-match "\\`\\.\\.?\\'"
4033 (file-name-nondirectory name
))
4035 (directory-files (or (car dirs
) ".") full
4036 (wildcard-to-regexp nondir
))))))
4039 (if (and (car dirs
) (not full
))
4040 (mapcar (function (lambda (name) (concat (car dirs
) name
)))
4044 (setq dirs
(cdr dirs
)))
4047 (defun list-directory (dirname &optional verbose
)
4048 "Display a list of files in or matching DIRNAME, a la `ls'.
4049 DIRNAME is globbed by the shell if necessary.
4050 Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
4051 Actions controlled by variables `list-directory-brief-switches'
4052 and `list-directory-verbose-switches'."
4053 (interactive (let ((pfx current-prefix-arg
))
4054 (list (read-file-name (if pfx
"List directory (verbose): "
4055 "List directory (brief): ")
4056 nil default-directory nil
)
4058 (let ((switches (if verbose list-directory-verbose-switches
4059 list-directory-brief-switches
))
4061 (or dirname
(setq dirname default-directory
))
4062 (setq dirname
(expand-file-name dirname
))
4063 (with-output-to-temp-buffer "*Directory*"
4064 (setq buffer standard-output
)
4065 (buffer-disable-undo standard-output
)
4066 (princ "Directory ")
4070 (set-buffer "*Directory*")
4071 (let ((wildcard (not (file-directory-p dirname
))))
4072 (insert-directory dirname switches wildcard
(not wildcard
)))))
4073 ;; Finishing with-output-to-temp-buffer seems to clobber default-directory.
4074 (with-current-buffer buffer
4075 (setq default-directory
4076 (if (file-directory-p dirname
)
4077 (file-name-as-directory dirname
)
4078 (file-name-directory dirname
))))))
4080 (defun shell-quote-wildcard-pattern (pattern)
4081 "Quote characters special to the shell in PATTERN, leave wildcards alone.
4083 PATTERN is assumed to represent a file-name wildcard suitable for the
4084 underlying filesystem. For Unix and GNU/Linux, the characters from the
4085 set [ \\t\\n;<>&|()#$] are quoted with a backslash; for DOS/Windows, all
4086 the parts of the pattern which don't include wildcard characters are
4087 quoted with double quotes.
4088 Existing quote characters in PATTERN are left alone, so you can pass
4089 PATTERN that already quotes some of the special characters."
4092 ((memq system-type
'(ms-dos windows-nt cygwin
))
4093 ;; DOS/Windows don't allow `"' in file names. So if the
4094 ;; argument has quotes, we can safely assume it is already
4095 ;; quoted by the caller.
4096 (if (or (string-match "[\"]" pattern
)
4097 ;; We quote [&()#$'] in case their shell is a port of a
4098 ;; Unixy shell. We quote [,=+] because stock DOS and
4099 ;; Windows shells require that in some cases, such as
4100 ;; passing arguments to batch files that use positional
4101 ;; arguments like %1.
4102 (not (string-match "[ \t;&()#$',=+]" pattern
)))
4107 (while (string-match "[*?]+" pattern beg
)
4108 (setq end
(match-beginning 0)
4109 result
(concat result
(substring pattern beg end
)
4111 (substring pattern end
(match-end 0))
4114 (concat result
(substring pattern beg
) "\""))))
4117 (while (string-match "[ \t\n;<>&|()#$]" pattern beg
)
4119 (concat (substring pattern
0 (match-beginning 0))
4121 (substring pattern
(match-beginning 0)))
4122 beg
(1+ (match-end 0)))))
4126 (defvar insert-directory-program
"ls"
4127 "Absolute or relative name of the `ls' program used by `insert-directory'.")
4129 (defcustom directory-free-space-program
"df"
4130 "*Program to get the amount of free space on a file system.
4131 We assume the output has the format of `df'.
4132 The value of this variable must be just a command name or file name;
4133 if you want to specify options, use `directory-free-space-args'.
4135 A value of nil disables this feature.
4137 If the function `file-system-info' is defined, it is always used in
4138 preference to the program given by this variable."
4139 :type
'(choice (string :tag
"Program") (const :tag
"None" nil
))
4142 (defcustom directory-free-space-args
4143 (if (eq system-type
'darwin
) "-k" "-Pk")
4144 "*Options to use when running `directory-free-space-program'."
4148 (defun get-free-disk-space (dir)
4149 "Return the mount of free space on directory DIR's file system.
4150 The result is a string that gives the number of free 1KB blocks,
4151 or nil if the system call or the program which retrieve the infornmation
4154 This function calls `file-system-info' if it is available, or invokes the
4155 program specified by `directory-free-space-program' if that is non-nil."
4156 ;; Try to find the number of free blocks. Non-Posix systems don't
4157 ;; always have df, but might have an equivalent system call.
4158 (if (fboundp 'file-system-info
)
4159 (let ((fsinfo (file-system-info dir
)))
4161 (format "%.0f" (/ (nth 2 fsinfo
) 1024))))
4164 (when (and directory-free-space-program
4165 (eq 0 (call-process directory-free-space-program
4167 directory-free-space-args
4169 ;; Usual format is a header line followed by a line of
4171 (goto-char (point-min))
4175 ;; Move to the end of the "available blocks" number.
4176 (skip-chars-forward "^ \t")
4178 ;; Copy it into AVAILABLE.
4179 (let ((end (point)))
4181 (buffer-substring (point) end
)))))))))
4185 ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and
4186 ;; FULL-DIRECTORY-P is nil.
4187 ;; The single line of output must display FILE's name as it was
4188 ;; given, namely, an absolute path name.
4189 ;; - must insert exactly one line for each file if WILDCARD or
4190 ;; FULL-DIRECTORY-P is t, plus one optional "total" line
4191 ;; before the file lines, plus optional text after the file lines.
4192 ;; Lines are delimited by "\n", so filenames containing "\n" are not
4194 ;; File lines should display the basename.
4195 ;; - must be consistent with
4196 ;; - functions dired-move-to-filename, (these two define what a file line is)
4197 ;; dired-move-to-end-of-filename,
4198 ;; dired-between-files, (shortcut for (not (dired-move-to-filename)))
4199 ;; dired-insert-headerline
4200 ;; dired-after-subdir-garbage (defines what a "total" line is)
4201 ;; - variable dired-subdir-regexp
4202 ;; - may be passed "--dired" as the first argument in SWITCHES.
4203 ;; Filename handlers might have to remove this switch if their
4204 ;; "ls" command does not support it.
4205 (defun insert-directory (file switches
&optional wildcard full-directory-p
)
4206 "Insert directory listing for FILE, formatted according to SWITCHES.
4207 Leaves point after the inserted text.
4208 SWITCHES may be a string of options, or a list of strings.
4209 Optional third arg WILDCARD means treat FILE as shell wildcard.
4210 Optional fourth arg FULL-DIRECTORY-P means file is a directory and
4211 switches do not contain `d', so that a full listing is expected.
4213 This works by running a directory listing program
4214 whose name is in the variable `insert-directory-program'.
4215 If WILDCARD, it also runs the shell specified by `shell-file-name'."
4216 ;; We need the directory in order to find the right handler.
4217 (let ((handler (find-file-name-handler (expand-file-name file
)
4218 'insert-directory
)))
4220 (funcall handler
'insert-directory file switches
4221 wildcard full-directory-p
)
4222 (if (eq system-type
'vax-vms
)
4223 (vms-read-directory file switches
(current-buffer))
4224 (let (result (beg (point)))
4226 ;; Read the actual directory using `insert-directory-program'.
4227 ;; RESULT gets the status code.
4228 (let* (;; We at first read by no-conversion, then after
4229 ;; putting text property `dired-filename, decode one
4230 ;; bunch by one to preserve that property.
4231 (coding-system-for-read 'no-conversion
)
4232 ;; This is to control encoding the arguments in call-process.
4233 (coding-system-for-write
4234 (and enable-multibyte-characters
4235 (or file-name-coding-system
4236 default-file-name-coding-system
))))
4239 ;; Run ls in the directory part of the file pattern
4240 ;; using the last component as argument.
4241 (let ((default-directory
4242 (if (file-name-absolute-p file
)
4243 (file-name-directory file
)
4244 (file-name-directory (expand-file-name file
))))
4245 (pattern (file-name-nondirectory file
)))
4247 shell-file-name nil t nil
4249 (concat (if (memq system-type
'(ms-dos windows-nt
))
4251 "\\") ; Disregard Unix shell aliases!
4252 insert-directory-program
4254 (if (stringp switches
)
4256 (mapconcat 'identity switches
" "))
4258 ;; Quote some characters that have
4259 ;; special meanings in shells; but
4260 ;; don't quote the wildcards--we want
4261 ;; them to be special. We also
4262 ;; currently don't quote the quoting
4263 ;; characters in case people want to
4264 ;; use them explicitly to quote
4265 ;; wildcard characters.
4266 (shell-quote-wildcard-pattern pattern
))))
4267 ;; SunOS 4.1.3, SVr4 and others need the "." to list the
4268 ;; directory if FILE is a symbolic link.
4269 (apply 'call-process
4270 insert-directory-program nil t nil
4272 (if (listp switches
) switches
4273 (unless (equal switches
"")
4274 ;; Split the switches at any spaces so we can
4275 ;; pass separate options as separate args.
4276 (split-string switches
)))
4277 ;; Avoid lossage if FILE starts with `-'.
4280 (if (string-match "\\`~" file
)
4281 (setq file
(expand-file-name file
)))
4283 (if full-directory-p
4284 (concat (file-name-as-directory file
) ".")
4287 ;; If `insert-directory-program' failed, signal an error.
4288 (unless (eq 0 result
)
4289 ;; On non-Posix systems, we cannot open a directory, so
4290 ;; don't even try, because that will always result in
4291 ;; the ubiquitous "Access denied". Instead, show the
4292 ;; command line so the user can try to guess what went wrong.
4293 (if (and (file-directory-p file
)
4294 (memq system-type
'(ms-dos windows-nt
)))
4296 "Reading directory: \"%s %s -- %s\" exited with status %s"
4297 insert-directory-program
4298 (if (listp switches
) (concat switches
) switches
)
4300 ;; Unix. Access the file to get a suitable error.
4301 (access-file file
"Reading directory")
4302 (error "Listing directory failed but `access-file' worked")))
4304 (when (string-match "--dired\\>" switches
)
4306 (when (looking-at "//SUBDIRED//")
4307 (delete-region (point) (progn (forward-line 1) (point)))
4309 (let ((end (line-end-position)))
4312 (while (< (point) end
)
4313 (let ((start (+ beg
(read (current-buffer))))
4314 (end (+ beg
(read (current-buffer)))))
4315 (if (= (char-after end
) ?
\n)
4316 (put-text-property start end
'dired-filename t
)
4317 ;; It seems that we can't trust ls's output as to
4318 ;; byte positions of filenames.
4319 (put-text-property beg
(point) 'dired-filename nil
)
4323 (delete-region (point) (progn (forward-line 2) (point)))))
4325 ;; Now decode what read if necessary.
4326 (let ((coding (or coding-system-for-read
4327 file-name-coding-system
4328 default-file-name-coding-system
4332 (when (and enable-multibyte-characters
4333 (not (memq (coding-system-base coding
)
4334 '(raw-text no-conversion
))))
4335 ;; If no coding system is specified or detection is
4336 ;; requested, detect the coding.
4337 (if (eq (coding-system-base coding
) 'undecided
)
4338 (setq coding
(detect-coding-region beg
(point) t
)))
4339 (if (not (eq (coding-system-base coding
) 'undecided
))
4342 (coding-system-change-eol-conversion coding
'unix
))
4343 (narrow-to-region beg
(point))
4344 (goto-char (point-min))
4347 val
(get-text-property (point) 'dired-filename
))
4348 (goto-char (next-single-property-change
4349 (point) 'dired-filename nil
(point-max)))
4350 ;; Force no eol conversion on a file name, so
4351 ;; that CR is preserved.
4352 (decode-coding-region pos
(point)
4353 (if val coding-no-eol coding
))
4355 (put-text-property pos
(point)
4356 'dired-filename t
)))))))
4358 (if full-directory-p
4359 ;; Try to insert the amount of free space.
4362 ;; First find the line to put it on.
4363 (when (re-search-forward "^ *\\(total\\)" nil t
)
4364 (let ((available (get-free-disk-space ".")))
4366 ;; Replace "total" with "used", to avoid confusion.
4367 (replace-match "total used in directory" nil nil nil
1)
4369 (insert " available " available
)))))))))))
4371 (defun insert-directory-safely (file switches
4372 &optional wildcard full-directory-p
)
4373 "Insert directory listing for FILE, formatted according to SWITCHES.
4375 Like `insert-directory', but if FILE does not exist, it inserts a
4376 message to that effect instead of signaling an error."
4377 (if (file-exists-p file
)
4378 (insert-directory file switches wildcard full-directory-p
)
4379 ;; Simulate the message printed by `ls'.
4380 (insert (format "%s: No such file or directory\n" file
))))
4382 (defvar kill-emacs-query-functions nil
4383 "Functions to call with no arguments to query about killing Emacs.
4384 If any of these functions returns nil, killing Emacs is cancelled.
4385 `save-buffers-kill-emacs' (\\[save-buffers-kill-emacs]) calls these functions,
4386 but `kill-emacs', the low level primitive, does not.
4387 See also `kill-emacs-hook'.")
4389 (defcustom confirm-kill-emacs nil
4390 "How to ask for confirmation when leaving Emacs.
4391 If nil, the default, don't ask at all. If the value is non-nil, it should
4392 be a predicate function such as `yes-or-no-p'."
4393 :type
'(choice (const :tag
"Ask with yes-or-no-p" yes-or-no-p
)
4394 (const :tag
"Ask with y-or-n-p" y-or-n-p
)
4395 (const :tag
"Don't confirm" nil
))
4399 (defun save-buffers-kill-emacs (&optional arg
)
4400 "Offer to save each buffer, then kill this Emacs process.
4401 With prefix arg, silently save all file-visiting buffers, then kill."
4403 (save-some-buffers arg t
)
4404 (and (or (not (memq t
(mapcar (function
4405 (lambda (buf) (and (buffer-file-name buf
)
4406 (buffer-modified-p buf
))))
4408 (yes-or-no-p "Modified buffers exist; exit anyway? "))
4409 (or (not (fboundp 'process-list
))
4410 ;; process-list is not defined on VMS.
4411 (let ((processes (process-list))
4414 (and (memq (process-status (car processes
)) '(run stop open listen
))
4415 (process-query-on-exit-flag (car processes
))
4417 (setq processes
(cdr processes
)))
4420 (yes-or-no-p "Active processes exist; kill them and exit anyway? "))))
4421 ;; Query the user for other things, perhaps.
4422 (run-hook-with-args-until-failure 'kill-emacs-query-functions
)
4423 (or (null confirm-kill-emacs
)
4424 (funcall confirm-kill-emacs
"Really exit Emacs? "))
4427 ;; We use /: as a prefix to "quote" a file name
4428 ;; so that magic file name handlers will not apply to it.
4430 (setq file-name-handler-alist
4431 (cons '("\\`/:" . file-name-non-special
)
4432 file-name-handler-alist
))
4434 ;; We depend on being the last handler on the list,
4435 ;; so that anything else which does need handling
4436 ;; has been handled already.
4437 ;; So it is safe for us to inhibit *all* magic file name handlers.
4439 (defun file-name-non-special (operation &rest arguments
)
4440 (let ((file-name-handler-alist nil
)
4442 (if (eq operation
'insert-directory
)
4443 (directory-file-name
4445 (unhandled-file-name-directory default-directory
)))
4447 ;; Get a list of the indices of the args which are file names.
4449 (cdr (or (assq operation
4450 ;; The first five are special because they
4451 ;; return a file name. We want to include the /:
4452 ;; in the return value.
4453 ;; So just avoid stripping it in the first place.
4454 '((expand-file-name . nil
)
4455 (file-name-directory . nil
)
4456 (file-name-as-directory . nil
)
4457 (directory-file-name . nil
)
4458 (file-name-sans-versions . nil
)
4459 ;; `identity' means just return the first arg
4460 ;; as stripped of its quoting.
4461 (substitute-in-file-name . identity
)
4462 (file-name-completion 1)
4463 (file-name-all-completions 1)
4466 (make-symbolic-link 0 1)
4467 (add-name-to-file 0 1)))
4468 ;; For all other operations, treat the first argument only
4469 ;; as the file name.
4471 ;; Copy ARGUMENTS so we can replace elements in it.
4472 (arguments (copy-sequence arguments
)))
4473 ;; Strip off the /: from the file names that have this handler.
4475 (while (consp file-arg-indices
)
4476 (let ((pair (nthcdr (car file-arg-indices
) arguments
)))
4478 (string-match "\\`/:" (car pair
))
4480 (if (= (length (car pair
)) 2)
4482 (substring (car pair
) 2)))))
4483 (setq file-arg-indices
(cdr file-arg-indices
))))
4484 (if (eq file-arg-indices
'identity
)
4486 (apply operation arguments
))))
4488 (define-key ctl-x-map
"\C-f" 'find-file
)
4489 (define-key ctl-x-map
"\C-r" 'find-file-read-only
)
4490 (define-key ctl-x-map
"\C-v" 'find-alternate-file
)
4491 (define-key ctl-x-map
"\C-s" 'save-buffer
)
4492 (define-key ctl-x-map
"s" 'save-some-buffers
)
4493 (define-key ctl-x-map
"\C-w" 'write-file
)
4494 (define-key ctl-x-map
"i" 'insert-file
)
4495 (define-key esc-map
"~" 'not-modified
)
4496 (define-key ctl-x-map
"\C-d" 'list-directory
)
4497 (define-key ctl-x-map
"\C-c" 'save-buffers-kill-emacs
)
4498 (define-key ctl-x-map
"\C-q" 'toggle-read-only
)
4500 (define-key ctl-x-4-map
"f" 'find-file-other-window
)
4501 (define-key ctl-x-4-map
"r" 'find-file-read-only-other-window
)
4502 (define-key ctl-x-4-map
"\C-f" 'find-file-other-window
)
4503 (define-key ctl-x-4-map
"b" 'switch-to-buffer-other-window
)
4504 (define-key ctl-x-4-map
"\C-o" 'display-buffer
)
4506 (define-key ctl-x-5-map
"b" 'switch-to-buffer-other-frame
)
4507 (define-key ctl-x-5-map
"f" 'find-file-other-frame
)
4508 (define-key ctl-x-5-map
"\C-f" 'find-file-other-frame
)
4509 (define-key ctl-x-5-map
"r" 'find-file-read-only-other-frame
)
4511 ;;; arch-tag: bc68d3ea-19ca-468b-aac6-3a4a7766101f
4512 ;;; files.el ends here