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c0274f38 ER |
1 | ;;; files.el --- file input and output commands for Emacs |
2 | ||
18cf9502 | 3 | ;; Copyright (C) 1985, 86, 87, 92, 93, 94 Free Software Foundation, Inc. |
b4da00e9 | 4 | |
3a801d0c ER |
5 | ;; Maintainer: FSF |
6 | ||
b4da00e9 RM |
7 | ;; This file is part of GNU Emacs. |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
e5167999 | 11 | ;; the Free Software Foundation; either version 2, or (at your option) |
b4da00e9 RM |
12 | ;; any later version. |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
21 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
e41b2db1 ER |
23 | ;;; Commentary: |
24 | ||
25 | ;; Defines most of Emacs's file- and directory-handling functions, | |
26 | ;; including basic file visiting, backup generation, link handling, | |
27 | ;; ITS-id version control, load- and write-hook handling, and the like. | |
28 | ||
e5167999 ER |
29 | ;;; Code: |
30 | ||
b4da00e9 RM |
31 | (defconst delete-auto-save-files t |
32 | "*Non-nil means delete a buffer's auto-save file when the buffer is saved.") | |
33 | ||
34 | (defconst directory-abbrev-alist | |
35 | nil | |
36 | "*Alist of abbreviations for file directories. | |
37 | A list of elements of the form (FROM . TO), each meaning to replace | |
38 | FROM with TO when it appears in a directory name. This replacement is | |
39 | done when setting up the default directory of a newly visited file. | |
40 | *Every* FROM string should start with `^'. | |
41 | ||
65151a1b RS |
42 | Do not use `~' in the TO strings. |
43 | They should be ordinary absolute directory names. | |
44 | ||
b4da00e9 RM |
45 | Use this feature when you have directories which you normally refer to |
46 | via absolute symbolic links. Make TO the name of the link, and FROM | |
47 | the name it is linked to.") | |
48 | ||
49 | ;;; Turn off backup files on VMS since it has version numbers. | |
50 | (defconst make-backup-files (not (eq system-type 'vax-vms)) | |
4ea836c1 | 51 | "*Non-nil means make a backup of a file the first time it is saved. |
b4da00e9 RM |
52 | This can be done by renaming the file or by copying. |
53 | ||
54 | Renaming means that Emacs renames the existing file so that it is a | |
55 | backup file, then writes the buffer into a new file. Any other names | |
56 | that the old file had will now refer to the backup file. The new file | |
57 | is owned by you and its group is defaulted. | |
58 | ||
59 | Copying means that Emacs copies the existing file into the backup | |
60 | file, then writes the buffer on top of the existing file. Any other | |
61 | names that the old file had will now refer to the new (edited) file. | |
62 | The file's owner and group are unchanged. | |
63 | ||
64 | The choice of renaming or copying is controlled by the variables | |
65 | `backup-by-copying', `backup-by-copying-when-linked' and | |
f862241d | 66 | `backup-by-copying-when-mismatch'. See also `backup-inhibited'.") |
b4da00e9 RM |
67 | |
68 | ;; Do this so that local variables based on the file name | |
69 | ;; are not overridden by the major mode. | |
70 | (defvar backup-inhibited nil | |
f862241d RS |
71 | "Non-nil means don't make a backup, regardless of the other parameters. |
72 | This variable is intended for use by making it local to a buffer. | |
73 | But it is local only if you make it local.") | |
b4da00e9 RM |
74 | (put 'backup-inhibited 'permanent-local t) |
75 | ||
76 | (defconst backup-by-copying nil | |
77 | "*Non-nil means always use copying to create backup files. | |
78 | See documentation of variable `make-backup-files'.") | |
79 | ||
80 | (defconst backup-by-copying-when-linked nil | |
81 | "*Non-nil means use copying to create backups for files with multiple names. | |
82 | This causes the alternate names to refer to the latest version as edited. | |
83 | This variable is relevant only if `backup-by-copying' is nil.") | |
84 | ||
85 | (defconst backup-by-copying-when-mismatch nil | |
86 | "*Non-nil means create backups by copying if this preserves owner or group. | |
87 | Renaming may still be used (subject to control of other variables) | |
88 | when it would not result in changing the owner or group of the file; | |
89 | that is, for files which are owned by you and whose group matches | |
90 | the default for a new file created there by you. | |
91 | This variable is relevant only if `backup-by-copying' is nil.") | |
92 | ||
93 | (defvar backup-enable-predicate | |
94 | '(lambda (name) | |
95 | (or (< (length name) 5) | |
96 | (not (string-equal "/tmp/" (substring name 0 5))))) | |
97 | "Predicate that looks at a file name and decides whether to make backups. | |
98 | Called with an absolute file name as argument, it returns t to enable backup.") | |
99 | ||
100 | (defconst buffer-offer-save nil | |
101 | "*Non-nil in a buffer means offer to save the buffer on exit | |
102 | even if the buffer is not visiting a file. | |
103 | Automatically local in all buffers.") | |
104 | (make-variable-buffer-local 'buffer-offer-save) | |
105 | ||
f3e23606 RS |
106 | (defconst find-file-existing-other-name nil |
107 | "*Non-nil means find a file under alternative names, in existing buffers. | |
108 | This means if any existing buffer is visiting the file you want | |
109 | under another name, you get the existing buffer instead of a new buffer.") | |
110 | ||
111 | (defconst find-file-visit-truename nil | |
112 | "*Non-nil means visit a file under its truename. | |
113 | The truename of a file is found by chasing all links | |
114 | both at the file level and at the levels of the containing directories.") | |
115 | ||
116 | (defvar buffer-file-truename nil | |
7d806fcd KH |
117 | "The abbreviated truename of the file visited in the current buffer. |
118 | That is, (abbreviated-file-name (file-truename buffer-file-name)). | |
f3e23606 RS |
119 | This variable is automatically local in all buffers, when non-nil.") |
120 | (make-variable-buffer-local 'buffer-file-truename) | |
121 | (put 'buffer-file-truename 'permanent-local t) | |
122 | ||
123 | (defvar buffer-file-number nil | |
124 | "The device number and file number of the file visited in the current buffer. | |
125 | The value is a list of the form (FILENUM DEVNUM). | |
126 | This pair of numbers uniquely identifies the file. | |
127 | If the buffer is visiting a new file, the value is nil.") | |
128 | (make-variable-buffer-local 'buffer-file-number) | |
129 | (put 'buffer-file-number 'permanent-local t) | |
130 | ||
b4da00e9 RM |
131 | (defconst file-precious-flag nil |
132 | "*Non-nil means protect against I/O errors while saving files. | |
133 | Some modes set this non-nil in particular buffers.") | |
134 | ||
135 | (defvar version-control nil | |
136 | "*Control use of version numbers for backup files. | |
137 | t means make numeric backup versions unconditionally. | |
138 | nil means make them for files that have some already. | |
139 | never means do not make them.") | |
140 | ||
141 | (defvar dired-kept-versions 2 | |
142 | "*When cleaning directory, number of versions to keep.") | |
143 | ||
144 | (defvar trim-versions-without-asking nil | |
6d74b528 ER |
145 | "*If t, deletes excess backup versions silently. |
146 | If nil, asks confirmation. Any other value prevents any trimming.") | |
b4da00e9 RM |
147 | |
148 | (defvar kept-old-versions 2 | |
149 | "*Number of oldest versions to keep when a new numbered backup is made.") | |
150 | ||
151 | (defvar kept-new-versions 2 | |
152 | "*Number of newest versions to keep when a new numbered backup is made. | |
153 | Includes the new backup. Must be > 0") | |
154 | ||
155 | (defconst require-final-newline nil | |
156 | "*Value of t says silently ensure a file ends in a newline when it is saved. | |
157 | Non-nil but not t says ask user whether to add a newline when there isn't one. | |
158 | nil means don't add newlines.") | |
159 | ||
160 | (defconst auto-save-default t | |
161 | "*Non-nil says by default do auto-saving of every file-visiting buffer.") | |
162 | ||
163 | (defconst auto-save-visited-file-name nil | |
164 | "*Non-nil says auto-save a buffer in the file it is visiting, when practical. | |
165 | Normally auto-save files are written under other names.") | |
166 | ||
167 | (defconst save-abbrevs nil | |
168 | "*Non-nil means save word abbrevs too when files are saved. | |
169 | Loading an abbrev file sets this to t.") | |
170 | ||
171 | (defconst find-file-run-dired t | |
320b4233 | 172 | "*Non-nil says run dired if `find-file' is given the name of a directory.") |
b4da00e9 | 173 | |
92966e6f RS |
174 | ;;;It is not useful to make this a local variable. |
175 | ;;;(put 'find-file-not-found-hooks 'permanent-local t) | |
b4da00e9 RM |
176 | (defvar find-file-not-found-hooks nil |
177 | "List of functions to be called for `find-file' on nonexistent file. | |
178 | These functions are called as soon as the error is detected. | |
179 | `buffer-file-name' is already set up. | |
180 | The functions are called in the order given until one of them returns non-nil.") | |
181 | ||
92966e6f RS |
182 | ;;;It is not useful to make this a local variable. |
183 | ;;;(put 'find-file-hooks 'permanent-local t) | |
b4da00e9 RM |
184 | (defvar find-file-hooks nil |
185 | "List of functions to be called after a buffer is loaded from a file. | |
186 | The buffer's local variables (if any) will have been processed before the | |
187 | functions are called.") | |
188 | ||
b4da00e9 RM |
189 | (defvar write-file-hooks nil |
190 | "List of functions to be called before writing out a buffer to a file. | |
191 | If one of them returns non-nil, the file is considered already written | |
8c0e7b73 JB |
192 | and the rest are not called. |
193 | These hooks are considered to pertain to the visited file. | |
194 | So this list is cleared if you change the visited file name. | |
c9dca4e0 RS |
195 | See also `write-contents-hooks'. |
196 | Don't make this variable buffer-local; instead, use `local-write-file-hooks'.") | |
b19f1da4 BF |
197 | ;;; However, in case someone does make it local... |
198 | (put 'write-file-hooks 'permanent-local t) | |
c9dca4e0 | 199 | |
c9dca4e0 RS |
200 | (defvar local-write-file-hooks nil |
201 | "Just like `write-file-hooks', except intended for per-buffer use. | |
202 | The functions in this list are called before the ones in | |
203 | `write-file-hooks'.") | |
b19f1da4 BF |
204 | (make-variable-buffer-local 'local-write-file-hooks) |
205 | (put 'local-write-file-hooks 'permanent-local t) | |
8c0e7b73 JB |
206 | |
207 | (defvar write-contents-hooks nil | |
208 | "List of functions to be called before writing out a buffer to a file. | |
209 | If one of them returns non-nil, the file is considered already written | |
210 | and the rest are not called. | |
211 | These hooks are considered to pertain to the buffer's contents, | |
212 | not to the particular visited file; thus, `set-visited-file-name' does | |
213 | not clear this variable, but changing the major mode does clear it. | |
214 | See also `write-file-hooks'.") | |
b4da00e9 RM |
215 | |
216 | (defconst enable-local-variables t | |
217 | "*Control use of local-variables lists in files you visit. | |
218 | The value can be t, nil or something else. | |
219 | A value of t means local-variables lists are obeyed; | |
220 | nil means they are ignored; anything else means query. | |
221 | ||
222 | The command \\[normal-mode] always obeys local-variables lists | |
223 | and ignores this variable.") | |
224 | ||
2bba782c | 225 | (defconst enable-local-eval 'maybe |
d207b766 RS |
226 | "*Control processing of the \"variable\" `eval' in a file's local variables. |
227 | The value can be t, nil or something else. | |
228 | A value of t means obey `eval' variables; | |
229 | nil means ignore them; anything else means query. | |
230 | ||
231 | The command \\[normal-mode] always obeys local-variables lists | |
232 | and ignores this variable.") | |
b4da00e9 RM |
233 | |
234 | ;; Avoid losing in versions where CLASH_DETECTION is disabled. | |
235 | (or (fboundp 'lock-buffer) | |
231c4e10 | 236 | (defalias 'lock-buffer 'ignore)) |
b4da00e9 | 237 | (or (fboundp 'unlock-buffer) |
231c4e10 | 238 | (defalias 'unlock-buffer 'ignore)) |
93fe0a35 RS |
239 | |
240 | ;; This hook function provides support for ange-ftp host name | |
241 | ;; completion. It runs the usual ange-ftp hook, but only for | |
242 | ;; completion operations. Having this here avoids the need | |
243 | ;; to load ange-ftp when it's not really in use. | |
244 | (defun ange-ftp-completion-hook-function (op &rest args) | |
245 | (if (memq op '(file-name-completion file-name-all-completions)) | |
246 | (apply 'ange-ftp-hook-function op args) | |
247 | (let (file-name-handler-alist) | |
248 | (apply op args)))) | |
b4da00e9 RM |
249 | \f |
250 | (defun pwd () | |
251 | "Show the current default directory." | |
252 | (interactive nil) | |
253 | (message "Directory %s" default-directory)) | |
254 | ||
231c4e10 ER |
255 | (defvar cd-path nil |
256 | "Value of the CDPATH environment variable, as a list. | |
257 | Not actually set up until the first time you you use it.") | |
258 | ||
259 | (defun parse-colon-path (cd-path) | |
260 | "Explode a colon-separated list of paths into a string list." | |
261 | (and cd-path | |
262 | (let (cd-prefix cd-list (cd-start 0) cd-colon) | |
263 | (setq cd-path (concat cd-path ":")) | |
264 | (while (setq cd-colon (string-match ":" cd-path cd-start)) | |
265 | (setq cd-list | |
9daefb36 | 266 | (nconc cd-list |
c52e4104 RS |
267 | (list (if (= cd-start cd-colon) |
268 | nil | |
269 | (substitute-in-file-name | |
e33e80e4 RS |
270 | (file-name-as-directory |
271 | (substring cd-path cd-start cd-colon))))))) | |
231c4e10 ER |
272 | (setq cd-start (+ cd-colon 1))) |
273 | cd-list))) | |
274 | ||
275 | (defun cd-absolute (dir) | |
30c5ce9c | 276 | "Change current directory to given absolute file name DIR." |
b3c4423b | 277 | (setq dir (abbreviate-file-name (expand-file-name dir))) |
b4da00e9 RM |
278 | (if (not (eq system-type 'vax-vms)) |
279 | (setq dir (file-name-as-directory dir))) | |
280 | (if (not (file-directory-p dir)) | |
281 | (error "%s is not a directory" dir) | |
282 | (if (file-executable-p dir) | |
283 | (setq default-directory dir) | |
9daefb36 | 284 | (error "Cannot cd to %s: Permission denied" dir)))) |
b4da00e9 | 285 | |
231c4e10 ER |
286 | (defun cd (dir) |
287 | "Make DIR become the current buffer's default directory. | |
30c5ce9c RS |
288 | If your environment includes a `CDPATH' variable, try each one of that |
289 | colon-separated list of directories when resolving a relative directory name." | |
231c4e10 | 290 | (interactive "FChange default directory: ") |
30c5ce9c RS |
291 | (if (file-name-absolute-p dir) |
292 | (cd-absolute (expand-file-name dir)) | |
293 | (if (null cd-path) | |
294 | (let ((trypath (parse-colon-path (getenv "CDPATH")))) | |
295 | (setq cd-path (or trypath (list "./"))))) | |
296 | (if (not (catch 'found | |
297 | (mapcar | |
298 | (function (lambda (x) | |
299 | (let ((f (expand-file-name (concat x dir)))) | |
300 | (if (file-directory-p f) | |
301 | (progn | |
302 | (cd-absolute f) | |
303 | (throw 'found t)))))) | |
304 | cd-path) | |
305 | nil)) | |
306 | (error "No such directory found via CDPATH environment variable")))) | |
231c4e10 | 307 | |
b4da00e9 RM |
308 | (defun load-file (file) |
309 | "Load the Lisp file named FILE." | |
310 | (interactive "fLoad file: ") | |
311 | (load (expand-file-name file) nil nil t)) | |
312 | ||
313 | (defun load-library (library) | |
314 | "Load the library named LIBRARY. | |
315 | This is an interface to the function `load'." | |
316 | (interactive "sLoad library: ") | |
317 | (load library)) | |
5d68c2c2 RS |
318 | |
319 | ;; OTHER is the other file to be compared. | |
320 | (defun file-local-copy (file) | |
321 | "Copy the file FILE into a temporary file on this machine. | |
322 | Returns the name of the local copy, or nil, if FILE is directly | |
323 | accessible." | |
5dbfdacd | 324 | (let ((handler (find-file-name-handler file))) |
5d68c2c2 RS |
325 | (if handler |
326 | (funcall handler 'file-local-copy file) | |
327 | nil))) | |
f3e23606 RS |
328 | |
329 | (defun file-truename (filename) | |
330 | "Return the truename of FILENAME, which should be absolute. | |
331 | The truename of a file name is found by chasing symbolic links | |
332 | both at the level of the file and at the level of the directories | |
333 | containing it, until no links are left at any level." | |
7a5a26a6 RS |
334 | (if (or (string= filename "~") |
335 | (and (string= (substring filename 0 1) "~") | |
336 | (string-match "~[^/]*" filename))) | |
1cc2fbeb RS |
337 | (progn |
338 | (setq filename (expand-file-name filename)) | |
339 | (if (string= filename "") | |
340 | (setq filename "/")))) | |
5dbfdacd | 341 | (let ((handler (find-file-name-handler filename))) |
6f176f94 RS |
342 | ;; For file name that has a special handler, call handler. |
343 | ;; This is so that ange-ftp can save time by doing a no-op. | |
344 | (if handler | |
345 | (funcall handler 'file-truename filename) | |
346 | (let ((dir (file-name-directory filename)) | |
347 | target dirfile) | |
348 | ;; Get the truename of the directory. | |
349 | (setq dirfile (directory-file-name dir)) | |
350 | ;; If these are equal, we have the (or a) root directory. | |
351 | (or (string= dir dirfile) | |
352 | (setq dir (file-name-as-directory (file-truename dirfile)))) | |
c3bf10c2 RS |
353 | (if (equal ".." (file-name-nondirectory filename)) |
354 | (directory-file-name (file-name-directory (directory-file-name dir))) | |
355 | (if (equal "." (file-name-nondirectory filename)) | |
356 | (directory-file-name dir) | |
357 | ;; Put it back on the file name. | |
358 | (setq filename (concat dir (file-name-nondirectory filename))) | |
359 | ;; Is the file name the name of a link? | |
360 | (setq target (file-symlink-p filename)) | |
361 | (if target | |
362 | ;; Yes => chase that link, then start all over | |
363 | ;; since the link may point to a directory name that uses links. | |
364 | ;; We can't safely use expand-file-name here | |
365 | ;; since target might look like foo/../bar where foo | |
366 | ;; is itself a link. Instead, we handle . and .. above. | |
367 | (if (file-name-absolute-p target) | |
368 | (file-truename target) | |
369 | (file-truename (concat dir target))) | |
370 | ;; No, we are done! | |
371 | filename))))))) | |
5dbfdacd | 372 | |
5dadeb29 RS |
373 | (defun file-chase-links (filename) |
374 | "Chase links in FILENAME until a name that is not a link. | |
375 | Does not examine containing directories for links, | |
376 | unlike `file-truename'." | |
377 | (let (tem (count 100) (newname filename)) | |
378 | (while (setq tem (file-symlink-p newname)) | |
379 | (if (= count 0) | |
380 | (error "Apparent cycle of symbolic links for %s" filename)) | |
cf65b429 RS |
381 | ;; Handle `..' by hand, since it needs to work in the |
382 | ;; target of any directory symlink. | |
383 | ;; This code is not quite complete; it does not handle | |
384 | ;; embedded .. in some cases such as ./../foo and foo/bar/../../../lose. | |
385 | (while (string-match "\\.\\./" tem) | |
386 | (setq tem (substring tem 3)) | |
387 | (setq newname (file-name-as-directory | |
388 | ;; Do the .. by hand. | |
389 | (directory-file-name | |
390 | (file-name-directory | |
391 | ;; Chase links in the default dir of the symlink. | |
392 | (file-chase-links | |
393 | (directory-file-name | |
394 | (file-name-directory newname)))))))) | |
5dadeb29 RS |
395 | (setq newname (expand-file-name tem (file-name-directory newname))) |
396 | (setq count (1- count))) | |
397 | newname)) | |
b4da00e9 RM |
398 | \f |
399 | (defun switch-to-buffer-other-window (buffer) | |
400 | "Select buffer BUFFER in another window." | |
401 | (interactive "BSwitch to buffer in other window: ") | |
402 | (let ((pop-up-windows t)) | |
403 | (pop-to-buffer buffer t))) | |
404 | ||
f98955ea JB |
405 | (defun switch-to-buffer-other-frame (buffer) |
406 | "Switch to buffer BUFFER in another frame." | |
407 | (interactive "BSwitch to buffer in other frame: ") | |
408 | (let ((pop-up-frames t)) | |
2be5e5db | 409 | (pop-to-buffer buffer t))) |
5bbbceb1 | 410 | |
b4da00e9 RM |
411 | (defun find-file (filename) |
412 | "Edit file FILENAME. | |
413 | Switch to a buffer visiting file FILENAME, | |
414 | creating one if none already exists." | |
415 | (interactive "FFind file: ") | |
416 | (switch-to-buffer (find-file-noselect filename))) | |
417 | ||
418 | (defun find-file-other-window (filename) | |
419 | "Edit file FILENAME, in another window. | |
420 | May create a new window, or reuse an existing one. | |
421 | See the function `display-buffer'." | |
422 | (interactive "FFind file in other window: ") | |
423 | (switch-to-buffer-other-window (find-file-noselect filename))) | |
424 | ||
f98955ea JB |
425 | (defun find-file-other-frame (filename) |
426 | "Edit file FILENAME, in another frame. | |
427 | May create a new frame, or reuse an existing one. | |
5bbbceb1 | 428 | See the function `display-buffer'." |
f98955ea JB |
429 | (interactive "FFind file in other frame: ") |
430 | (switch-to-buffer-other-frame (find-file-noselect filename))) | |
5bbbceb1 | 431 | |
b4da00e9 RM |
432 | (defun find-file-read-only (filename) |
433 | "Edit file FILENAME but don't allow changes. | |
434 | Like \\[find-file] but marks buffer as read-only. | |
435 | Use \\[toggle-read-only] to permit editing." | |
436 | (interactive "fFind file read-only: ") | |
437 | (find-file filename) | |
320b4233 RS |
438 | (setq buffer-read-only t) |
439 | (current-buffer)) | |
b4da00e9 RM |
440 | |
441 | (defun find-file-read-only-other-window (filename) | |
442 | "Edit file FILENAME in another window but don't allow changes. | |
443 | Like \\[find-file-other-window] but marks buffer as read-only. | |
444 | Use \\[toggle-read-only] to permit editing." | |
445 | (interactive "fFind file read-only other window: ") | |
9466a1f6 | 446 | (find-file-other-window filename) |
320b4233 RS |
447 | (setq buffer-read-only t) |
448 | (current-buffer)) | |
b4da00e9 | 449 | |
f98955ea JB |
450 | (defun find-file-read-only-other-frame (filename) |
451 | "Edit file FILENAME in another frame but don't allow changes. | |
452 | Like \\[find-file-other-frame] but marks buffer as read-only. | |
5bbbceb1 | 453 | Use \\[toggle-read-only] to permit editing." |
f98955ea JB |
454 | (interactive "fFind file read-only other frame: ") |
455 | (find-file-other-frame filename) | |
320b4233 RS |
456 | (setq buffer-read-only t) |
457 | (current-buffer)) | |
5bbbceb1 | 458 | |
b4da00e9 RM |
459 | (defun find-alternate-file (filename) |
460 | "Find file FILENAME, select its buffer, kill previous buffer. | |
461 | If the current buffer now contains an empty file that you just visited | |
462 | \(presumably by mistake), use this command to visit the file you really want." | |
463 | (interactive | |
464 | (let ((file buffer-file-name) | |
465 | (file-name nil) | |
466 | (file-dir nil)) | |
467 | (and file | |
468 | (setq file-name (file-name-nondirectory file) | |
469 | file-dir (file-name-directory file))) | |
a61f59b4 JA |
470 | (list (read-file-name |
471 | "Find alternate file: " file-dir nil nil file-name)))) | |
b4da00e9 RM |
472 | (and (buffer-modified-p) |
473 | ;; (not buffer-read-only) | |
474 | (not (yes-or-no-p (format "Buffer %s is modified; kill anyway? " | |
475 | (buffer-name)))) | |
476 | (error "Aborted")) | |
477 | (let ((obuf (current-buffer)) | |
478 | (ofile buffer-file-name) | |
8bb27285 RS |
479 | (onum buffer-file-number) |
480 | (otrue buffer-file-truename) | |
b4da00e9 RM |
481 | (oname (buffer-name))) |
482 | (rename-buffer " **lose**") | |
483 | (setq buffer-file-name nil) | |
8bb27285 RS |
484 | (setq buffer-file-number nil) |
485 | (setq buffer-file-truename nil) | |
b4da00e9 RM |
486 | (unwind-protect |
487 | (progn | |
488 | (unlock-buffer) | |
489 | (find-file filename)) | |
490 | (cond ((eq obuf (current-buffer)) | |
491 | (setq buffer-file-name ofile) | |
8bb27285 RS |
492 | (setq buffer-file-number onum) |
493 | (setq buffer-file-truename otrue) | |
b4da00e9 RM |
494 | (lock-buffer) |
495 | (rename-buffer oname)))) | |
496 | (or (eq (current-buffer) obuf) | |
497 | (kill-buffer obuf)))) | |
498 | ||
499 | (defun create-file-buffer (filename) | |
500 | "Create a suitably named buffer for visiting FILENAME, and return it. | |
501 | FILENAME (sans directory) is used unchanged if that name is free; | |
502 | otherwise a string <2> or <3> or ... is appended to get an unused name." | |
503 | (let ((lastname (file-name-nondirectory filename))) | |
504 | (if (string= lastname "") | |
505 | (setq lastname filename)) | |
506 | (generate-new-buffer lastname))) | |
507 | ||
5bbbceb1 JB |
508 | (defun generate-new-buffer (name) |
509 | "Create and return a buffer with a name based on NAME. | |
29165787 | 510 | Choose the buffer's name using `generate-new-buffer-name'." |
5bbbceb1 JB |
511 | (get-buffer-create (generate-new-buffer-name name))) |
512 | ||
e373f201 JB |
513 | (defconst automount-dir-prefix "^/tmp_mnt/" |
514 | "Regexp to match the automounter prefix in a directory name.") | |
515 | ||
ffb3a4db | 516 | (defvar abbreviated-home-dir nil |
292297c6 | 517 | "The user's homedir abbreviated according to `directory-abbrev-list'.") |
ffb3a4db | 518 | |
5bbbceb1 | 519 | (defun abbreviate-file-name (filename) |
29165787 | 520 | "Return a version of FILENAME shortened using `directory-abbrev-alist'. |
5bbbceb1 | 521 | This also substitutes \"~\" for the user's home directory. |
29165787 | 522 | Type \\[describe-variable] directory-abbrev-alist RET for more information." |
e373f201 JB |
523 | ;; Get rid of the prefixes added by the automounter. |
524 | (if (and (string-match automount-dir-prefix filename) | |
525 | (file-exists-p (file-name-directory | |
526 | (substring filename (1- (match-end 0)))))) | |
527 | (setq filename (substring filename (1- (match-end 0))))) | |
5bbbceb1 | 528 | (let ((tail directory-abbrev-alist)) |
ffb3a4db RS |
529 | ;; If any elt of directory-abbrev-alist matches this name, |
530 | ;; abbreviate accordingly. | |
5bbbceb1 JB |
531 | (while tail |
532 | (if (string-match (car (car tail)) filename) | |
533 | (setq filename | |
534 | (concat (cdr (car tail)) (substring filename (match-end 0))))) | |
535 | (setq tail (cdr tail))) | |
ffb3a4db RS |
536 | ;; Compute and save the abbreviated homedir name. |
537 | ;; We defer computing this until the first time it's needed, to | |
538 | ;; give time for directory-abbrev-alist to be set properly. | |
e98dda89 RS |
539 | ;; We include a slash at the end, to avoid spurious matches |
540 | ;; such as `/usr/foobar' when the home dir is `/usr/foo'. | |
ffb3a4db RS |
541 | (or abbreviated-home-dir |
542 | (setq abbreviated-home-dir | |
543 | (let ((abbreviated-home-dir "$foo")) | |
3a8a836d RS |
544 | (concat "^" (abbreviate-file-name (expand-file-name "~")) |
545 | "\\(/\\|$\\)")))) | |
546 | ||
ffb3a4db RS |
547 | ;; If FILENAME starts with the abbreviated homedir, |
548 | ;; make it start with `~' instead. | |
ca33ccb5 RS |
549 | (if (and (string-match abbreviated-home-dir filename) |
550 | ;; If the home dir is just /, don't change it. | |
551 | (not (and (= (match-end 0) 1) | |
552 | (= (aref filename 0) ?/)))) | |
5bbbceb1 | 553 | (setq filename |
28dbf501 JB |
554 | (concat "~" |
555 | ;; If abbreviated-home-dir ends with a slash, | |
556 | ;; don't remove the corresponding slash from | |
557 | ;; filename. On MS-DOS and OS/2, you can have | |
558 | ;; home directories like "g:/", in which it is | |
559 | ;; important not to remove the slash. And what | |
560 | ;; about poor root on Unix systems? | |
561 | (if (eq ?/ (aref abbreviated-home-dir | |
562 | (1- (length abbreviated-home-dir)))) | |
563 | "/" | |
564 | "") | |
3a8a836d | 565 | (substring filename (match-beginning 1) (match-end 1)) |
28dbf501 | 566 | (substring filename (match-end 0))))) |
5bbbceb1 JB |
567 | filename)) |
568 | ||
1770543d RS |
569 | (defvar find-file-not-true-dirname-list nil |
570 | "*List of logical names for which visiting shouldn't save the true dirname. | |
571 | On VMS, when you visit a file using a logical name that searches a path, | |
572 | you may or may not want the visited file name to record the specific | |
573 | directory where the file was found. If you *do not* want that, add the logical | |
574 | name to this list as a string.") | |
575 | ||
b4da00e9 RM |
576 | (defun find-file-noselect (filename &optional nowarn) |
577 | "Read file FILENAME into a buffer and return the buffer. | |
578 | If a buffer exists visiting FILENAME, return that one, but | |
579 | verify that the file has not changed since visited or saved. | |
580 | The buffer is not selected, just returned to the caller." | |
e373f201 JB |
581 | (setq filename |
582 | (abbreviate-file-name | |
583 | (expand-file-name filename))) | |
b4da00e9 RM |
584 | (if (file-directory-p filename) |
585 | (if find-file-run-dired | |
586 | (dired-noselect filename) | |
587 | (error "%s is a directory." filename)) | |
f3e23606 RS |
588 | (let* ((buf (get-file-buffer filename)) |
589 | (truename (abbreviate-file-name (file-truename filename))) | |
590 | (number (nthcdr 10 (file-attributes truename))) | |
591 | ;; Find any buffer for a file which has same truename. | |
592 | (same-truename | |
593 | (or buf ; Shortcut | |
594 | (let (found | |
595 | (list (buffer-list))) | |
596 | (while (and (not found) list) | |
597 | (save-excursion | |
598 | (set-buffer (car list)) | |
4269ed64 RM |
599 | (if (and buffer-file-name |
600 | (string= buffer-file-truename truename)) | |
f3e23606 RS |
601 | (setq found (car list)))) |
602 | (setq list (cdr list))) | |
603 | found))) | |
604 | (same-number | |
605 | (or buf ; Shortcut | |
606 | (and number | |
607 | (let (found | |
608 | (list (buffer-list))) | |
609 | (while (and (not found) list) | |
610 | (save-excursion | |
611 | (set-buffer (car list)) | |
4e7afa86 RS |
612 | (if (and (equal buffer-file-number number) |
613 | ;; Verify this buffer's file number | |
614 | ;; still belongs to its file. | |
615 | (file-exists-p buffer-file-name) | |
616 | (equal (nthcdr 10 (file-attributes buffer-file-name)) number)) | |
f3e23606 RS |
617 | (setq found (car list)))) |
618 | (setq list (cdr list))) | |
619 | found)))) | |
620 | error) | |
621 | ;; Let user know if there is a buffer with the same truename. | |
622 | (if (and (not buf) same-truename (not nowarn)) | |
623 | (message "%s and %s are the same file (%s)" | |
624 | filename (buffer-file-name same-truename) | |
625 | truename) | |
626 | (if (and (not buf) same-number (not nowarn)) | |
627 | (message "%s and %s are the same file" | |
628 | filename (buffer-file-name same-number)))) | |
629 | ||
630 | ;; Optionally also find that buffer. | |
631 | (if (or find-file-existing-other-name find-file-visit-truename) | |
632 | (setq buf (or same-truename same-number))) | |
b4da00e9 RM |
633 | (if buf |
634 | (or nowarn | |
635 | (verify-visited-file-modtime buf) | |
636 | (cond ((not (file-exists-p filename)) | |
637 | (error "File %s no longer exists!" filename)) | |
638 | ((yes-or-no-p | |
639 | (format | |
640 | (if (buffer-modified-p buf) | |
641 | "File %s changed on disk. Discard your edits? " | |
642 | "File %s changed on disk. Read the new version? ") | |
643 | (file-name-nondirectory filename))) | |
644 | (save-excursion | |
645 | (set-buffer buf) | |
646 | (revert-buffer t t))))) | |
647 | (save-excursion | |
f3e23606 RS |
648 | ;;; The truename stuff makes this obsolete. |
649 | ;;; (let* ((link-name (car (file-attributes filename))) | |
650 | ;;; (linked-buf (and (stringp link-name) | |
651 | ;;; (get-file-buffer link-name)))) | |
652 | ;;; (if (bufferp linked-buf) | |
653 | ;;; (message "Symbolic link to file in buffer %s" | |
654 | ;;; (buffer-name linked-buf)))) | |
b4da00e9 RM |
655 | (setq buf (create-file-buffer filename)) |
656 | (set-buffer buf) | |
657 | (erase-buffer) | |
658 | (condition-case () | |
659 | (insert-file-contents filename t) | |
660 | (file-error | |
661 | (setq error t) | |
662 | ;; Run find-file-not-found-hooks until one returns non-nil. | |
663 | (let ((hooks find-file-not-found-hooks)) | |
664 | (while (and hooks | |
455d9d28 RS |
665 | (not (and (funcall (car hooks)) |
666 | ;; If a hook succeeded, clear error. | |
667 | (progn (setq error nil) | |
668 | ;; Also exit the loop. | |
669 | t)))) | |
b4da00e9 | 670 | (setq hooks (cdr hooks)))))) |
f3e23606 RS |
671 | ;; Find the file's truename, and maybe use that as visited name. |
672 | (setq buffer-file-truename (abbreviate-file-name truename)) | |
1770543d RS |
673 | (setq buffer-file-number number) |
674 | ;; On VMS, we may want to remember which directory in a search list | |
675 | ;; the file was found in. | |
676 | (and (eq system-type 'vax-vms) | |
677 | (let (logical) | |
678 | (if (string-match ":" (file-name-directory filename)) | |
679 | (setq logical (substring (file-name-directory filename) | |
680 | 0 (match-beginning 0)))) | |
681 | (not (member logical find-file-not-true-dirname-list))) | |
682 | (setq buffer-file-name buffer-file-truename)) | |
1cc2fbeb | 683 | (if find-file-visit-truename |
27d0420c RS |
684 | (setq buffer-file-name |
685 | (setq filename | |
686 | (expand-file-name buffer-file-truename)))) | |
b4da00e9 RM |
687 | ;; Set buffer's default directory to that of the file. |
688 | (setq default-directory (file-name-directory filename)) | |
689 | ;; Turn off backup files for certain file names. Since | |
690 | ;; this is a permanent local, the major mode won't eliminate it. | |
691 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
692 | (progn | |
693 | (make-local-variable 'backup-inhibited) | |
694 | (setq backup-inhibited t))) | |
695 | (after-find-file error (not nowarn)))) | |
696 | buf))) | |
697 | \f | |
8cfb9d46 | 698 | (defun after-find-file (&optional error warn noauto) |
b4da00e9 RM |
699 | "Called after finding a file and by the default revert function. |
700 | Sets buffer mode, parses local variables. | |
8cfb9d46 | 701 | Optional args ERROR, WARN, and NOAUTO: ERROR non-nil means there was an |
b4da00e9 RM |
702 | error in reading the file. WARN non-nil means warn if there |
703 | exists an auto-save file more recent than the visited file. | |
8cfb9d46 | 704 | NOAUTO means don't mess with auto-save mode. |
b4da00e9 RM |
705 | Finishes by calling the functions in `find-file-hooks'." |
706 | (setq buffer-read-only (not (file-writable-p buffer-file-name))) | |
707 | (if noninteractive | |
708 | nil | |
709 | (let* (not-serious | |
710 | (msg | |
711 | (cond ((and error (file-attributes buffer-file-name)) | |
712 | (setq buffer-read-only t) | |
ff78d520 | 713 | "File exists, but cannot be read.") |
b4da00e9 RM |
714 | ((not buffer-read-only) |
715 | (if (and warn | |
716 | (file-newer-than-file-p (make-auto-save-file-name) | |
717 | buffer-file-name)) | |
718 | "Auto save file is newer; consider M-x recover-file" | |
719 | (setq not-serious t) | |
720 | (if error "(New file)" nil))) | |
721 | ((not error) | |
722 | (setq not-serious t) | |
723 | "Note: file is write protected") | |
724 | ((file-attributes (directory-file-name default-directory)) | |
725 | "File not found and directory write-protected") | |
4e43240a RS |
726 | ((file-exists-p (file-name-directory buffer-file-name)) |
727 | (setq buffer-read-only nil)) | |
b4da00e9 | 728 | (t |
5bbbceb1 | 729 | (setq buffer-read-only nil) |
4e43240a RS |
730 | (if (file-exists-p (file-name-directory (directory-file-name (file-name-directory buffer-file-name)))) |
731 | "Use M-x make-dir RET RET to create the directory" | |
732 | "Use C-u M-x make-dir RET RET to create directory and its parents"))))) | |
b4da00e9 RM |
733 | (if msg |
734 | (progn | |
735 | (message msg) | |
736 | (or not-serious (sit-for 1 nil t))))) | |
8cfb9d46 | 737 | (if (and auto-save-default (not noauto)) |
b4da00e9 RM |
738 | (auto-save-mode t))) |
739 | (normal-mode t) | |
740 | (mapcar 'funcall find-file-hooks)) | |
741 | ||
742 | (defun normal-mode (&optional find-file) | |
743 | "Choose the major mode for this buffer automatically. | |
744 | Also sets up any specified local variables of the file. | |
745 | Uses the visited file name, the -*- line, and the local variables spec. | |
746 | ||
747 | This function is called automatically from `find-file'. In that case, | |
748 | we may set up specified local variables depending on the value of | |
749 | `enable-local-variables': if it is t, we do; if it is nil, we don't; | |
750 | otherwise, we query. `enable-local-variables' is ignored if you | |
751 | run `normal-mode' explicitly." | |
752 | (interactive) | |
753 | (or find-file (funcall (or default-major-mode 'fundamental-mode))) | |
754 | (condition-case err | |
755 | (set-auto-mode) | |
756 | (error (message "File mode specification error: %s" | |
757 | (prin1-to-string err)))) | |
758 | (condition-case err | |
7b3f3dc2 JB |
759 | (let ((enable-local-variables (or (not find-file) |
760 | enable-local-variables))) | |
761 | (hack-local-variables)) | |
b4da00e9 RM |
762 | (error (message "File local-variables error: %s" |
763 | (prin1-to-string err))))) | |
764 | ||
7b3f3dc2 JB |
765 | (defvar auto-mode-alist (mapcar 'purecopy |
766 | '(("\\.text\\'" . text-mode) | |
767 | ("\\.c\\'" . c-mode) | |
768 | ("\\.h\\'" . c-mode) | |
769 | ("\\.tex\\'" . TeX-mode) | |
770 | ("\\.ltx\\'" . LaTeX-mode) | |
771 | ("\\.el\\'" . emacs-lisp-mode) | |
772 | ("\\.mm\\'" . nroff-mode) | |
773 | ("\\.me\\'" . nroff-mode) | |
c80d2575 ER |
774 | ("\\.ms\\'" . nroff-mode) |
775 | ("\\.man\\'" . nroff-mode) | |
7b3f3dc2 JB |
776 | ("\\.scm\\'" . scheme-mode) |
777 | ("\\.l\\'" . lisp-mode) | |
778 | ("\\.lisp\\'" . lisp-mode) | |
779 | ("\\.f\\'" . fortran-mode) | |
780 | ("\\.for\\'" . fortran-mode) | |
e70991d4 RS |
781 | ("\\.p\\'" . pascal-mode) |
782 | ("\\.pas\\'" . pascal-mode) | |
7b3f3dc2 JB |
783 | ("\\.mss\\'" . scribe-mode) |
784 | ("\\.pl\\'" . prolog-mode) | |
785 | ("\\.cc\\'" . c++-mode) | |
2b845a8c | 786 | ("\\.hh\\'" . c++-mode) |
7b3f3dc2 | 787 | ("\\.C\\'" . c++-mode) |
2b845a8c | 788 | ("\\.H\\'" . c++-mode) |
a3666e47 RS |
789 | ;;; ("\\.mk\\'" . makefile-mode) |
790 | ;;; ("[Mm]akefile" . makefile-mode) | |
7b3f3dc2 JB |
791 | ;;; Less common extensions come here |
792 | ;;; so more common ones above are found faster. | |
7ca1d903 RS |
793 | ("\\.texinfo\\'" . texinfo-mode) |
794 | ("\\.texi\\'" . texinfo-mode) | |
7b3f3dc2 JB |
795 | ("\\.s\\'" . asm-mode) |
796 | ("ChangeLog\\'" . change-log-mode) | |
bb157910 | 797 | ("change.log\\'" . change-log-mode) |
9bb004f6 | 798 | ("changelo\\'" . change-log-mode) |
7adc58e5 | 799 | ("ChangeLog.[0-9]+\\'" . change-log-mode) |
7b3f3dc2 | 800 | ("\\$CHANGE_LOG\\$\\.TXT" . change-log-mode) |
7adc58e5 RS |
801 | ;; The following should come after the ChangeLog pattern |
802 | ;; for the sake of ChangeLog.1, etc. | |
803 | ("\\.[12345678]\\'" . nroff-mode) | |
7b3f3dc2 JB |
804 | ("\\.TeX\\'" . TeX-mode) |
805 | ("\\.sty\\'" . LaTeX-mode) | |
806 | ("\\.bbl\\'" . LaTeX-mode) | |
807 | ("\\.bib\\'" . bibtex-mode) | |
808 | ("\\.article\\'" . text-mode) | |
809 | ("\\.letter\\'" . text-mode) | |
7ca1d903 | 810 | ("\\.tcl\\'" . tcl-mode) |
7b3f3dc2 JB |
811 | ("\\.lsp\\'" . lisp-mode) |
812 | ("\\.awk\\'" . awk-mode) | |
813 | ("\\.prolog\\'" . prolog-mode) | |
c80d2575 | 814 | ("\\.tar\\'" . tar-mode) |
7b3f3dc2 JB |
815 | ;; Mailer puts message to be edited in |
816 | ;; /tmp/Re.... or Message | |
817 | ("^/tmp/Re" . text-mode) | |
818 | ("/Message[0-9]*\\'" . text-mode) | |
819 | ;; some news reader is reported to use this | |
820 | ("^/tmp/fol/" . text-mode) | |
821 | ("\\.y\\'" . c-mode) | |
c80d2575 | 822 | ("\\.lex\\'" . c-mode) |
7b3f3dc2 JB |
823 | ("\\.oak\\'" . scheme-mode) |
824 | ("\\.scm.[0-9]*\\'" . scheme-mode) | |
278584fb RS |
825 | ("\\.sgm\\'" . sgml-mode) |
826 | ("\\.sgml\\'" . sgml-mode) | |
827 | ("\\.dtd\\'" . sgml-mode) | |
7b3f3dc2 JB |
828 | ;; .emacs following a directory delimiter |
829 | ;; in either Unix or VMS syntax. | |
830 | ("[]>:/]\\..*emacs\\'" . emacs-lisp-mode) | |
bb157910 RS |
831 | ;; _emacs following a directory delimiter |
832 | ;; in MsDos syntax | |
833 | ("[:/]_emacs\\'" . emacs-lisp-mode) | |
7b3f3dc2 JB |
834 | ("\\.ml\\'" . lisp-mode))) |
835 | "\ | |
836 | Alist of filename patterns vs corresponding major mode functions. | |
81860e46 RS |
837 | Each element looks like (REGEXP . FUNCTION) or (REGEXP FUNCTION). |
838 | Visiting a file whose name matches REGEXP causes FUNCTION to be called. | |
839 | If the element has the form (REGEXP FUNCTION), then after calling | |
840 | FUNCTION, we delete the suffix that matched REGEXP and search the list | |
841 | again for another match.") | |
7b3f3dc2 | 842 | |
c907d156 RS |
843 | (defconst interpreter-mode-alist |
844 | '(("perl" . perl-mode) | |
845 | ("scope" . tcl-mode) | |
846 | ("wish" . tcl-mode) | |
847 | ("shell" . tcl-mode) | |
848 | ("form" . tcl-mode) | |
8db739de NF |
849 | ("tcl" . tcl-mode) |
850 | ("awk" . awk-mode) | |
851 | ("gawk" . awk-mode) | |
852 | ("scm" . scheme-mode)) | |
c907d156 RS |
853 | "Alist mapping interpreter names to major modes. |
854 | This alist applies to files whose first line starts with `#!'. | |
855 | Each element looks like (INTERPRETER . MODE). | |
856 | The car of each element is compared with | |
857 | the name of the interpreter specified in the first line. | |
858 | If it matches, mode MODE is selected.") | |
859 | ||
a0c9f21b RS |
860 | (defconst inhibit-local-variables-regexps '("\\.tar$") |
861 | "List of regexps; if one matches a file name, don't look for local vars.") | |
862 | ||
bb157910 RS |
863 | (defvar user-init-file |
864 | "" ; set by command-line | |
865 | "File name including directory of user's initialization file.") | |
866 | ||
b4da00e9 RM |
867 | (defun set-auto-mode () |
868 | "Select major mode appropriate for current buffer. | |
7b3f3dc2 | 869 | This checks for a -*- mode tag in the buffer's text, or |
81860e46 | 870 | compares the filename against the entries in `auto-mode-alist'. It does |
7b3f3dc2 JB |
871 | not check for the \"mode:\" local variable in the Local Variables |
872 | section of the file; for that, use `hack-local-variables'. | |
873 | ||
f3e23606 | 874 | If `enable-local-variables' is nil, this function does not check for a |
7b3f3dc2 | 875 | -*- mode tag." |
b4da00e9 | 876 | ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*- |
9fa7bfe5 | 877 | (let (beg end done) |
b4da00e9 RM |
878 | (save-excursion |
879 | (goto-char (point-min)) | |
880 | (skip-chars-forward " \t\n") | |
9fa7bfe5 RS |
881 | (and enable-local-variables |
882 | ;; Don't look for -*- if this file name matches any | |
883 | ;; of the regexps in inhibit-local-variables-regexps. | |
884 | (let ((temp inhibit-local-variables-regexps)) | |
885 | (while (and temp | |
886 | (not (string-match (car temp) | |
887 | buffer-file-name))) | |
888 | (setq temp (cdr temp))) | |
889 | (not temp)) | |
890 | (search-forward "-*-" (save-excursion | |
891 | ;; If the file begins with "#!" | |
892 | ;; (exec interpreter magic), look | |
893 | ;; for mode frobs in the first two | |
894 | ;; lines. You cannot necessarily | |
895 | ;; put them in the first line of | |
896 | ;; such a file without screwing up | |
897 | ;; the interpreter invocation. | |
898 | (end-of-line (and (looking-at "^#!") 2)) | |
899 | (point)) t) | |
900 | (progn | |
901 | (skip-chars-forward " \t") | |
902 | (setq beg (point)) | |
903 | (search-forward "-*-" | |
904 | (save-excursion (end-of-line) (point)) | |
905 | t)) | |
906 | (progn | |
907 | (forward-char -3) | |
908 | (skip-chars-backward " \t") | |
909 | (setq end (point)) | |
910 | (goto-char beg) | |
911 | (if (save-excursion (search-forward ":" end t)) | |
912 | ;; Find all specifications for the `mode:' variable | |
913 | ;; and execute hem left to right. | |
914 | (while (let ((case-fold-search t)) | |
915 | (search-forward "mode:" end t)) | |
916 | (skip-chars-forward " \t") | |
917 | (setq beg (point)) | |
918 | (if (search-forward ";" end t) | |
919 | (forward-char -1) | |
920 | (goto-char end)) | |
921 | (skip-chars-backward " \t") | |
922 | (funcall (intern (concat (downcase (buffer-substring beg (point))) "-mode")))) | |
923 | ;; Simple -*-MODE-*- case. | |
924 | (funcall (intern (concat (downcase (buffer-substring beg end)) "-mode")))) | |
925 | (setq done t))) | |
926 | ;; If we didn't find a mode from a -*- line, try using the file name. | |
927 | (if (and (not done) buffer-file-name) | |
81860e46 RS |
928 | (let ((name buffer-file-name) |
929 | (case-fold-search (eq system-type 'vax-vms)) | |
930 | (keep-going t)) | |
931 | ;; Remove backup-suffixes from file name. | |
932 | (setq name (file-name-sans-versions name)) | |
933 | (while keep-going | |
934 | (setq keep-going nil) | |
935 | (let ((alist auto-mode-alist) | |
936 | (mode nil)) | |
937 | ;; Find first matching alist entry. | |
938 | (while (and (not mode) alist) | |
939 | (if (string-match (car (car alist)) name) | |
940 | (if (and (consp (cdr (car alist))) | |
941 | (nth 2 (car alist))) | |
942 | (progn | |
943 | (setq mode (car (cdr (car alist))) | |
944 | name (substring name 0 (match-beginning 0)) | |
945 | keep-going t)) | |
946 | (setq mode (cdr (car alist)) | |
947 | keep-going nil))) | |
948 | (setq alist (cdr alist))) | |
c907d156 RS |
949 | (if mode |
950 | (funcall mode) | |
951 | ;; If we can't deduce a mode from the file name, | |
952 | ;; look for an interpreter specified in the first line. | |
953 | (let ((interpreter | |
954 | (save-excursion | |
955 | (goto-char (point-min)) | |
956 | (if (looking-at "#! *") | |
957 | (progn | |
958 | (goto-char (match-end 0)) | |
959 | (buffer-substring (point) | |
960 | (progn (end-of-line) (point)))) | |
961 | ""))) | |
962 | elt) | |
963 | ;; Map interpreter name to a mode. | |
964 | (setq elt (assoc (file-name-nondirectory interpreter) | |
965 | interpreter-mode-alist)) | |
966 | (if elt | |
967 | (funcall (cdr elt)))))))))))) | |
b4da00e9 | 968 | |
f3e23606 RS |
969 | (defun hack-local-variables-prop-line () |
970 | ;; Set local variables specified in the -*- line. | |
9fa7bfe5 RS |
971 | ;; Ignore any specification for `mode:'; |
972 | ;; set-auto-mode should already have handled that. | |
f3e23606 RS |
973 | (save-excursion |
974 | (goto-char (point-min)) | |
975 | (skip-chars-forward " \t\n\r") | |
976 | (let ((result '()) | |
9fa7bfe5 | 977 | (end (save-excursion (end-of-line) (point)))) |
f3e23606 RS |
978 | ;; Parse the -*- line into the `result' alist. |
979 | (cond ((not (search-forward "-*-" end t)) | |
980 | ;; doesn't have one. | |
981 | nil) | |
982 | ((looking-at "[ \t]*\\([^ \t\n\r:;]+\\)\\([ \t]*-\\*-\\)") | |
983 | ;; Simple form: "-*- MODENAME -*-". | |
984 | (setq result | |
985 | (list (cons 'mode | |
986 | (intern (buffer-substring | |
987 | (match-beginning 1) | |
988 | (match-end 1))))))) | |
989 | (t | |
990 | ;; Hairy form: '-*-' [ <variable> ':' <value> ';' ]* '-*-' | |
991 | ;; (last ";" is optional). | |
992 | (save-excursion | |
993 | (if (search-forward "-*-" end t) | |
994 | (setq end (- (point) 3)) | |
995 | (error "-*- not terminated before end of line"))) | |
996 | (while (< (point) end) | |
997 | (or (looking-at "[ \t]*\\([^ \t\n:]+\\)[ \t]*:[ \t]*") | |
998 | (error "malformed -*- line")) | |
999 | (goto-char (match-end 0)) | |
1000 | (let ((key (intern (downcase (buffer-substring | |
1001 | (match-beginning 1) | |
1002 | (match-end 1))))) | |
1003 | (val (save-restriction | |
1004 | (narrow-to-region (point) end) | |
1005 | (read (current-buffer))))) | |
1006 | (setq result (cons (cons key val) result)) | |
1007 | (skip-chars-forward " \t;"))) | |
1008 | (setq result (nreverse result)))) | |
f3e23606 RS |
1009 | |
1010 | (if (and result | |
1011 | (or (eq enable-local-variables t) | |
1012 | (and enable-local-variables | |
1013 | (save-window-excursion | |
6f931919 RS |
1014 | (condition-case nil |
1015 | (switch-to-buffer (current-buffer)) | |
1016 | (error | |
1017 | ;; If we fail to switch in the selected window, | |
1018 | ;; it is probably a minibuffer. | |
1019 | ;; So try another window. | |
1020 | (condition-case nil | |
1021 | (switch-to-buffer-other-window (current-buffer)) | |
1022 | (error | |
1023 | (switch-to-buffer-other-frame (current-buffer)))))) | |
f3e23606 RS |
1024 | (y-or-n-p (format "Set local variables as specified in -*- line of %s? " |
1025 | (file-name-nondirectory buffer-file-name))))))) | |
1026 | (while result | |
1027 | (let ((key (car (car result))) | |
1028 | (val (cdr (car result)))) | |
9fa7bfe5 RS |
1029 | (or (eq key 'mode) |
1030 | (hack-one-local-variable key val))) | |
1031 | (setq result (cdr result))))))) | |
f3e23606 | 1032 | |
7b3f3dc2 | 1033 | (defun hack-local-variables () |
5792c834 | 1034 | "Parse and put into effect this buffer's local variables spec." |
f3e23606 | 1035 | (hack-local-variables-prop-line) |
b4da00e9 RM |
1036 | ;; Look for "Local variables:" line in last page. |
1037 | (save-excursion | |
1038 | (goto-char (point-max)) | |
1039 | (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move) | |
1040 | (if (let ((case-fold-search t)) | |
1041 | (and (search-forward "Local Variables:" nil t) | |
7b3f3dc2 | 1042 | (or (eq enable-local-variables t) |
b4da00e9 RM |
1043 | (and enable-local-variables |
1044 | (save-window-excursion | |
1045 | (switch-to-buffer (current-buffer)) | |
1046 | (save-excursion | |
1047 | (beginning-of-line) | |
1048 | (set-window-start (selected-window) (point))) | |
1049 | (y-or-n-p (format "Set local variables as specified at end of %s? " | |
51de78c1 RS |
1050 | (if buffer-file-name |
1051 | (file-name-nondirectory | |
1052 | buffer-file-name) | |
1053 | (concat "buffer " | |
1054 | (buffer-name)))))))))) | |
b4da00e9 | 1055 | (let ((continue t) |
2bba782c RS |
1056 | prefix prefixlen suffix beg |
1057 | (enable-local-eval enable-local-eval)) | |
b4da00e9 RM |
1058 | ;; The prefix is what comes before "local variables:" in its line. |
1059 | ;; The suffix is what comes after "local variables:" in its line. | |
1060 | (skip-chars-forward " \t") | |
1061 | (or (eolp) | |
1062 | (setq suffix (buffer-substring (point) | |
1063 | (progn (end-of-line) (point))))) | |
1064 | (goto-char (match-beginning 0)) | |
1065 | (or (bolp) | |
1066 | (setq prefix | |
1067 | (buffer-substring (point) | |
1068 | (progn (beginning-of-line) (point))))) | |
7b3f3dc2 | 1069 | |
b4da00e9 RM |
1070 | (if prefix (setq prefixlen (length prefix) |
1071 | prefix (regexp-quote prefix))) | |
1072 | (if suffix (setq suffix (concat (regexp-quote suffix) "$"))) | |
1073 | (while continue | |
1074 | ;; Look at next local variable spec. | |
1075 | (if selective-display (re-search-forward "[\n\C-m]") | |
1076 | (forward-line 1)) | |
1077 | ;; Skip the prefix, if any. | |
1078 | (if prefix | |
1079 | (if (looking-at prefix) | |
1080 | (forward-char prefixlen) | |
1081 | (error "Local variables entry is missing the prefix"))) | |
1082 | ;; Find the variable name; strip whitespace. | |
1083 | (skip-chars-forward " \t") | |
1084 | (setq beg (point)) | |
1085 | (skip-chars-forward "^:\n") | |
1086 | (if (eolp) (error "Missing colon in local variables entry")) | |
1087 | (skip-chars-backward " \t") | |
1088 | (let* ((str (buffer-substring beg (point))) | |
1089 | (var (read str)) | |
1090 | val) | |
1091 | ;; Setting variable named "end" means end of list. | |
1092 | (if (string-equal (downcase str) "end") | |
1093 | (setq continue nil) | |
1094 | ;; Otherwise read the variable value. | |
1095 | (skip-chars-forward "^:") | |
1096 | (forward-char 1) | |
1097 | (setq val (read (current-buffer))) | |
1098 | (skip-chars-backward "\n") | |
1099 | (skip-chars-forward " \t") | |
1100 | (or (if suffix (looking-at suffix) (eolp)) | |
1101 | (error "Local variables entry is terminated incorrectly")) | |
1102 | ;; Set the variable. "Variables" mode and eval are funny. | |
f3e23606 RS |
1103 | (hack-one-local-variable var val)))))))) |
1104 | ||
1105 | (defconst ignored-local-variables | |
1106 | '(enable-local-eval) | |
1107 | "Variables to be ignored in a file's local variable spec.") | |
1108 | ||
1109 | ;; "Set" one variable in a local variables spec. | |
1110 | ;; A few variable names are treated specially. | |
1111 | (defun hack-one-local-variable (var val) | |
1112 | (cond ((eq var 'mode) | |
1113 | (funcall (intern (concat (downcase (symbol-name val)) | |
1114 | "-mode")))) | |
1115 | ((memq var ignored-local-variables) | |
1116 | nil) | |
1117 | ;; "Setting" eval means either eval it or do nothing. | |
7d3221d7 | 1118 | ;; Likewise for setting hook variables. |
fea504fb | 1119 | ((or (memq var '(eval file-name-handler-alist after-load-alist)) |
7d3221d7 | 1120 | (string-match "-hooks?$\\|-functions?$" (symbol-name var))) |
f3e23606 RS |
1121 | (if (and (not (string= (user-login-name) "root")) |
1122 | (or (eq enable-local-eval t) | |
1123 | (and enable-local-eval | |
1124 | (save-window-excursion | |
1125 | (switch-to-buffer (current-buffer)) | |
1126 | (save-excursion | |
1127 | (beginning-of-line) | |
1128 | (set-window-start (selected-window) (point))) | |
1129 | (setq enable-local-eval | |
7d3221d7 | 1130 | (y-or-n-p (format "Process `eval' or hook local variables in file %s? " |
f3e23606 | 1131 | (file-name-nondirectory buffer-file-name)))))))) |
7d3221d7 RS |
1132 | (if (eq var 'eval) |
1133 | (save-excursion (eval val)) | |
1134 | (make-local-variable var) | |
1135 | (set var val)) | |
f3e23606 RS |
1136 | (message "Ignoring `eval:' in file's local variables"))) |
1137 | ;; Ordinary variable, really set it. | |
1138 | (t (make-local-variable var) | |
1139 | (set var val)))) | |
1140 | ||
b4da00e9 RM |
1141 | \f |
1142 | (defun set-visited-file-name (filename) | |
1143 | "Change name of file visited in current buffer to FILENAME. | |
1144 | The next time the buffer is saved it will go in the newly specified file. | |
1145 | nil or empty string as argument means make buffer not be visiting any file. | |
1146 | Remember to delete the initial contents of the minibuffer | |
1147 | if you wish to pass an empty string as the argument." | |
1148 | (interactive "FSet visited file name: ") | |
1149 | (if filename | |
1150 | (setq filename | |
1151 | (if (string-equal filename "") | |
1152 | nil | |
1153 | (expand-file-name filename)))) | |
1154 | (or (equal filename buffer-file-name) | |
b4da00e9 | 1155 | (progn |
6a8f71e7 | 1156 | (and filename (lock-buffer filename)) |
b4da00e9 RM |
1157 | (unlock-buffer))) |
1158 | (setq buffer-file-name filename) | |
1159 | (if filename ; make buffer name reflect filename. | |
5bbbceb1 | 1160 | (let ((new-name (file-name-nondirectory buffer-file-name))) |
b4da00e9 RM |
1161 | (if (string= new-name "") |
1162 | (error "Empty file name")) | |
1163 | (if (eq system-type 'vax-vms) | |
1164 | (setq new-name (downcase new-name))) | |
1165 | (setq default-directory (file-name-directory buffer-file-name)) | |
6f931919 RS |
1166 | (or (string= new-name (buffer-name)) |
1167 | (rename-buffer new-name t)))) | |
b4da00e9 RM |
1168 | (setq buffer-backed-up nil) |
1169 | (clear-visited-file-modtime) | |
f3e23606 RS |
1170 | (if filename |
1171 | (progn | |
1172 | (setq buffer-file-truename | |
1173 | (abbreviate-file-name (file-truename buffer-file-name))) | |
1174 | (if find-file-visit-truename | |
1175 | (setq buffer-file-name buffer-file-truename)) | |
1176 | (setq buffer-file-number (nth 10 (file-attributes buffer-file-name)))) | |
1177 | (setq buffer-file-truename nil buffer-file-number nil)) | |
b4da00e9 RM |
1178 | ;; write-file-hooks is normally used for things like ftp-find-file |
1179 | ;; that visit things that are not local files as if they were files. | |
1180 | ;; Changing to visit an ordinary local file instead should flush the hook. | |
1181 | (kill-local-variable 'write-file-hooks) | |
c9dca4e0 | 1182 | (kill-local-variable 'local-write-file-hooks) |
b4da00e9 RM |
1183 | (kill-local-variable 'revert-buffer-function) |
1184 | (kill-local-variable 'backup-inhibited) | |
1185 | ;; Turn off backup files for certain file names. | |
1186 | ;; Since this is a permanent local, the major mode won't eliminate it. | |
1187 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
1188 | (progn | |
1189 | (make-local-variable 'backup-inhibited) | |
1190 | (setq backup-inhibited t))) | |
c77a81cf RS |
1191 | (let ((oauto buffer-auto-save-file-name)) |
1192 | ;; If auto-save was not already on, turn it on if appropriate. | |
1193 | (if (not buffer-auto-save-file-name) | |
1194 | (and buffer-file-name auto-save-default | |
1195 | (auto-save-mode t)) | |
1196 | ;; If auto save is on, start using a new name. | |
1197 | ;; We deliberately don't rename or delete the old auto save | |
1198 | ;; for the old visited file name. This is because perhaps | |
1199 | ;; the user wants to save the new state and then compare with the | |
1200 | ;; previous state from the auto save file. | |
1201 | (setq buffer-auto-save-file-name | |
1202 | (make-auto-save-file-name))) | |
1203 | ;; Rename the old auto save file if any. | |
1204 | (and oauto buffer-auto-save-file-name | |
e6f0e76c | 1205 | (file-exists-p oauto) |
c77a81cf | 1206 | (rename-file oauto buffer-auto-save-file-name t))) |
b4da00e9 RM |
1207 | (if buffer-file-name |
1208 | (set-buffer-modified-p t))) | |
1209 | ||
1210 | (defun write-file (filename) | |
1211 | "Write current buffer into file FILENAME. | |
41f48cb1 RS |
1212 | Makes buffer visit that file, and marks it not modified. |
1213 | If the buffer is already visiting a file, you can specify | |
1214 | a directory name as FILENAME, to write a file of the same | |
1215 | old name in that directory." | |
b4da00e9 RM |
1216 | ;; (interactive "FWrite file: ") |
1217 | (interactive | |
1218 | (list (if buffer-file-name | |
1219 | (read-file-name "Write file: " | |
1220 | nil nil nil nil) | |
1221 | (read-file-name "Write file: " | |
1222 | (cdr (assq 'default-directory | |
1223 | (buffer-local-variables))) | |
1224 | nil nil (buffer-name))))) | |
1225 | (or (null filename) (string-equal filename "") | |
41f48cb1 RS |
1226 | (progn |
1227 | ;; If arg is just a directory, | |
1228 | ;; use same file name, but in that directory. | |
1229 | (if (and (file-directory-p filename) buffer-file-name) | |
1230 | (setq filename (concat (file-name-as-directory filename) | |
1231 | (file-name-nondirectory buffer-file-name)))) | |
1232 | (set-visited-file-name filename))) | |
b4da00e9 RM |
1233 | (set-buffer-modified-p t) |
1234 | (save-buffer)) | |
1235 | \f | |
1236 | (defun backup-buffer () | |
1237 | "Make a backup of the disk file visited by the current buffer, if appropriate. | |
1238 | This is normally done before saving the buffer the first time. | |
1239 | If the value is non-nil, it is the result of `file-modes' on the original | |
1240 | file; this means that the caller, after saving the buffer, should change | |
1241 | the modes of the new file to agree with the old modes." | |
1242 | (if (and make-backup-files (not backup-inhibited) | |
1243 | (not buffer-backed-up) | |
1244 | (file-exists-p buffer-file-name) | |
1245 | (memq (aref (elt (file-attributes buffer-file-name) 8) 0) | |
1246 | '(?- ?l))) | |
1247 | (let ((real-file-name buffer-file-name) | |
1248 | backup-info backupname targets setmodes) | |
1249 | ;; If specified name is a symbolic link, chase it to the target. | |
1250 | ;; Thus we make the backups in the directory where the real file is. | |
5dadeb29 | 1251 | (setq real-file-name (file-chase-links real-file-name)) |
b4da00e9 RM |
1252 | (setq backup-info (find-backup-file-name real-file-name) |
1253 | backupname (car backup-info) | |
1254 | targets (cdr backup-info)) | |
1255 | ;;; (if (file-directory-p buffer-file-name) | |
1256 | ;;; (error "Cannot save buffer in directory %s" buffer-file-name)) | |
1257 | (condition-case () | |
1258 | (let ((delete-old-versions | |
1259 | ;; If have old versions to maybe delete, | |
1260 | ;; ask the user to confirm now, before doing anything. | |
1261 | ;; But don't actually delete til later. | |
1262 | (and targets | |
6d74b528 | 1263 | (or (eq trim-versions-without-asking t) (eq trim-versions-without-asking nil)) |
b4da00e9 RM |
1264 | (or trim-versions-without-asking |
1265 | (y-or-n-p (format "Delete excess backup versions of %s? " | |
1266 | real-file-name)))))) | |
1267 | ;; Actually write the back up file. | |
1268 | (condition-case () | |
1269 | (if (or file-precious-flag | |
1270 | ; (file-symlink-p buffer-file-name) | |
1271 | backup-by-copying | |
1272 | (and backup-by-copying-when-linked | |
1273 | (> (file-nlinks real-file-name) 1)) | |
1274 | (and backup-by-copying-when-mismatch | |
1275 | (let ((attr (file-attributes real-file-name))) | |
1276 | (or (nth 9 attr) | |
1277 | (/= (nth 2 attr) (user-uid)))))) | |
65864ae0 RS |
1278 | (condition-case () |
1279 | (copy-file real-file-name backupname t t) | |
1280 | (file-error | |
1281 | ;; If copying fails because file BACKUPNAME | |
1282 | ;; is not writable, delete that file and try again. | |
1283 | (if (and (file-exists-p backupname) | |
1284 | (not (file-writable-p backupname))) | |
1285 | (delete-file backupname)) | |
1286 | (copy-file real-file-name backupname t t))) | |
1287 | ;; rename-file should delete old backup. | |
b4da00e9 RM |
1288 | (rename-file real-file-name backupname t) |
1289 | (setq setmodes (file-modes backupname))) | |
1290 | (file-error | |
1291 | ;; If trouble writing the backup, write it in ~. | |
1292 | (setq backupname (expand-file-name "~/%backup%~")) | |
1293 | (message "Cannot write backup file; backing up in ~/%%backup%%~") | |
1294 | (sleep-for 1) | |
65864ae0 RS |
1295 | (condition-case () |
1296 | (copy-file real-file-name backupname t t) | |
1297 | (file-error | |
1298 | ;; If copying fails because file BACKUPNAME | |
1299 | ;; is not writable, delete that file and try again. | |
1300 | (if (and (file-exists-p backupname) | |
1301 | (not (file-writable-p backupname))) | |
1302 | (delete-file backupname)) | |
1303 | (copy-file real-file-name backupname t t))))) | |
b4da00e9 RM |
1304 | (setq buffer-backed-up t) |
1305 | ;; Now delete the old versions, if desired. | |
1306 | (if delete-old-versions | |
1307 | (while targets | |
1308 | (condition-case () | |
1309 | (delete-file (car targets)) | |
1310 | (file-error nil)) | |
1311 | (setq targets (cdr targets)))) | |
1312 | setmodes) | |
1313 | (file-error nil))))) | |
1314 | ||
c3554e95 | 1315 | (defun file-name-sans-versions (name &optional keep-backup-version) |
b4da00e9 RM |
1316 | "Return FILENAME sans backup versions or strings. |
1317 | This is a separate procedure so your site-init or startup file can | |
c3554e95 RS |
1318 | redefine it. |
1319 | If the optional argument KEEP-BACKUP-VERSION is non-nil, | |
1320 | we do not remove backup version numbers, only true file version numbers." | |
5dbfdacd | 1321 | (let ((handler (find-file-name-handler name))) |
c3554e95 RS |
1322 | (if handler |
1323 | (funcall handler 'file-name-sans-versions name keep-backup-version) | |
1324 | (substring name 0 | |
1325 | (if (eq system-type 'vax-vms) | |
1326 | ;; VMS version number is (a) semicolon, optional | |
1327 | ;; sign, zero or more digits or (b) period, option | |
1328 | ;; sign, zero or more digits, provided this is the | |
1329 | ;; second period encountered outside of the | |
1330 | ;; device/directory part of the file name. | |
1331 | (or (string-match ";[---+]?[0-9]*\\'" name) | |
1332 | (if (string-match "\\.[^]>:]*\\(\\.[---+]?[0-9]*\\)\\'" | |
1333 | name) | |
1334 | (match-beginning 1)) | |
1335 | (length name)) | |
1336 | (if keep-backup-version | |
1337 | (length name) | |
1338 | (or (string-match "\\.~[0-9]+~\\'" name) | |
1339 | (string-match "~\\'" name) | |
1340 | (length name)))))))) | |
b4da00e9 RM |
1341 | |
1342 | (defun make-backup-file-name (file) | |
1343 | "Create the non-numeric backup file name for FILE. | |
1344 | This is a separate function so you can redefine it for customization." | |
bb157910 RS |
1345 | (if (eq system-type 'ms-dos) |
1346 | (let ((fn (file-name-nondirectory file))) | |
1347 | (concat (file-name-directory file) | |
1348 | (if (string-match "\\([^.]*\\)\\(\\..*\\)?" fn) | |
1349 | (substring fn 0 (match-end 1))) | |
1350 | ".bak")) | |
1351 | (concat file "~"))) | |
b4da00e9 RM |
1352 | |
1353 | (defun backup-file-name-p (file) | |
1354 | "Return non-nil if FILE is a backup file name (numeric or not). | |
1355 | This is a separate function so you can redefine it for customization. | |
1356 | You may need to redefine `file-name-sans-versions' as well." | |
bb157910 RS |
1357 | (if (eq system-type 'ms-dos) |
1358 | (string-match "\\.bak$" file) | |
1359 | (string-match "~$" file))) | |
b4da00e9 | 1360 | |
2d051399 RS |
1361 | ;; This is used in various files. |
1362 | ;; The usage of bv-length is not very clean, | |
1363 | ;; but I can't see a good alternative, | |
1364 | ;; so as of now I am leaving it alone. | |
1365 | (defun backup-extract-version (fn) | |
1366 | "Given the name of a numeric backup file, return the backup number. | |
1367 | Uses the free variable `bv-length', whose value should be | |
1368 | the index in the name where the version number begins." | |
1369 | (if (and (string-match "[0-9]+~$" fn bv-length) | |
1370 | (= (match-beginning 0) bv-length)) | |
1371 | (string-to-int (substring fn bv-length -1)) | |
1372 | 0)) | |
1373 | ||
b4da00e9 RM |
1374 | ;; I believe there is no need to alter this behavior for VMS; |
1375 | ;; since backup files are not made on VMS, it should not get called. | |
1376 | (defun find-backup-file-name (fn) | |
1377 | "Find a file name for a backup file, and suggestions for deletions. | |
1378 | Value is a list whose car is the name for the backup file | |
1379 | and whose cdr is a list of old versions to consider deleting now." | |
1380 | (if (eq version-control 'never) | |
1381 | (list (make-backup-file-name fn)) | |
1382 | (let* ((base-versions (concat (file-name-nondirectory fn) ".~")) | |
1383 | (bv-length (length base-versions)) | |
7a5a26a6 RS |
1384 | possibilities |
1385 | (versions nil) | |
1386 | (high-water-mark 0) | |
1387 | (deserve-versions-p nil) | |
1388 | (number-to-delete 0)) | |
1389 | (condition-case () | |
1390 | (setq possibilities (file-name-all-completions | |
1391 | base-versions | |
1392 | (file-name-directory fn)) | |
1393 | versions (sort (mapcar | |
1394 | (function backup-extract-version) | |
1395 | possibilities) | |
1396 | '<) | |
1397 | high-water-mark (apply 'max 0 versions) | |
1398 | deserve-versions-p (or version-control | |
1399 | (> high-water-mark 0)) | |
1400 | number-to-delete (- (length versions) | |
1401 | kept-old-versions kept-new-versions -1)) | |
1402 | (file-error | |
1403 | (setq possibilities nil))) | |
b4da00e9 RM |
1404 | (if (not deserve-versions-p) |
1405 | (list (make-backup-file-name fn)) | |
1406 | (cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~") | |
9115e938 NF |
1407 | (if (and (> number-to-delete 0) |
1408 | ;; Delete nothing if there is overflow | |
1409 | ;; in the number of versions to keep. | |
1410 | (>= (+ kept-new-versions kept-old-versions -1) 0)) | |
b4da00e9 RM |
1411 | (mapcar (function (lambda (n) |
1412 | (concat fn ".~" (int-to-string n) "~"))) | |
1413 | (let ((v (nthcdr kept-old-versions versions))) | |
1414 | (rplacd (nthcdr (1- number-to-delete) v) ()) | |
1415 | v)))))))) | |
1416 | ||
b4da00e9 RM |
1417 | (defun file-nlinks (filename) |
1418 | "Return number of names file FILENAME has." | |
1419 | (car (cdr (file-attributes filename)))) | |
6c636af9 RM |
1420 | |
1421 | (defun file-relative-name (filename &optional directory) | |
1422 | "Convert FILENAME to be relative to DIRECTORY (default: default-directory)." | |
1423 | (setq filename (expand-file-name filename) | |
77fb6aed RS |
1424 | directory (file-name-as-directory (expand-file-name |
1425 | (or directory default-directory)))) | |
b1fa544f KH |
1426 | (let ((ancestor "")) |
1427 | (while (not (string-match (concat "^" (regexp-quote directory)) filename)) | |
1428 | (setq directory (file-name-directory (substring directory 0 -1)) | |
1429 | ancestor (concat "../" ancestor))) | |
1430 | (concat ancestor (substring filename (match-end 0))))) | |
b4da00e9 RM |
1431 | \f |
1432 | (defun save-buffer (&optional args) | |
1433 | "Save current buffer in visited file if modified. Versions described below. | |
1434 | By default, makes the previous version into a backup file | |
1435 | if previously requested or if this is the first save. | |
1436 | With 1 or 3 \\[universal-argument]'s, marks this version | |
1437 | to become a backup when the next save is done. | |
1438 | With 2 or 3 \\[universal-argument]'s, | |
1439 | unconditionally makes the previous version into a backup file. | |
1440 | With argument of 0, never makes the previous version into a backup file. | |
1441 | ||
1442 | If a file's name is FOO, the names of its numbered backup versions are | |
1443 | FOO.~i~ for various integers i. A non-numbered backup file is called FOO~. | |
1444 | Numeric backups (rather than FOO~) will be made if value of | |
1445 | `version-control' is not the atom `never' and either there are already | |
1446 | numeric versions of the file being backed up, or `version-control' is | |
1447 | non-nil. | |
1448 | We don't want excessive versions piling up, so there are variables | |
1449 | `kept-old-versions', which tells Emacs how many oldest versions to keep, | |
1450 | and `kept-new-versions', which tells how many newest versions to keep. | |
1451 | Defaults are 2 old versions and 2 new. | |
1452 | `dired-kept-versions' controls dired's clean-directory (.) command. | |
1453 | If `trim-versions-without-asking' is nil, system will query user | |
1454 | before trimming versions. Otherwise it does it silently." | |
1455 | (interactive "p") | |
1456 | (let ((modp (buffer-modified-p)) | |
1457 | (large (> (buffer-size) 50000)) | |
1458 | (make-backup-files (and make-backup-files (not (eq args 0))))) | |
1459 | (and modp (memq args '(16 64)) (setq buffer-backed-up nil)) | |
1460 | (if (and modp large) (message "Saving file %s..." (buffer-file-name))) | |
1461 | (basic-save-buffer) | |
1462 | (and modp (memq args '(4 64)) (setq buffer-backed-up nil)))) | |
1463 | ||
1464 | (defun delete-auto-save-file-if-necessary (&optional force) | |
1465 | "Delete auto-save file for current buffer if `delete-auto-save-files' is t. | |
1466 | Normally delete only if the file was written by this Emacs since | |
1467 | the last real save, but optional arg FORCE non-nil means delete anyway." | |
1468 | (and buffer-auto-save-file-name delete-auto-save-files | |
1469 | (not (string= buffer-file-name buffer-auto-save-file-name)) | |
1470 | (or force (recent-auto-save-p)) | |
1471 | (progn | |
1472 | (condition-case () | |
1473 | (delete-file buffer-auto-save-file-name) | |
1474 | (file-error nil)) | |
1475 | (set-buffer-auto-saved)))) | |
1476 | ||
1477 | (defun basic-save-buffer () | |
1478 | "Save the current buffer in its visited file, if it has been modified." | |
1479 | (interactive) | |
1480 | (if (buffer-modified-p) | |
1481 | (let ((recent-save (recent-auto-save-p)) | |
1482 | setmodes tempsetmodes) | |
1483 | ;; On VMS, rename file and buffer to get rid of version number. | |
1484 | (if (and (eq system-type 'vax-vms) | |
1485 | (not (string= buffer-file-name | |
1486 | (file-name-sans-versions buffer-file-name)))) | |
1487 | (let (buffer-new-name) | |
1488 | ;; Strip VMS version number before save. | |
1489 | (setq buffer-file-name | |
1490 | (file-name-sans-versions buffer-file-name)) | |
1491 | ;; Construct a (unique) buffer name to correspond. | |
1492 | (let ((buf (create-file-buffer (downcase buffer-file-name)))) | |
1493 | (setq buffer-new-name (buffer-name buf)) | |
1494 | (kill-buffer buf)) | |
1495 | (rename-buffer buffer-new-name))) | |
1496 | ;; If buffer has no file name, ask user for one. | |
1497 | (or buffer-file-name | |
2943f983 RS |
1498 | (set-visited-file-name |
1499 | (expand-file-name (read-file-name "File to save in: ") nil))) | |
b4da00e9 RM |
1500 | (or (verify-visited-file-modtime (current-buffer)) |
1501 | (not (file-exists-p buffer-file-name)) | |
1502 | (yes-or-no-p | |
1503 | (format "%s has changed since visited or saved. Save anyway? " | |
1504 | (file-name-nondirectory buffer-file-name))) | |
1505 | (error "Save not confirmed")) | |
1506 | (save-restriction | |
1507 | (widen) | |
1508 | (and (> (point-max) 1) | |
1509 | (/= (char-after (1- (point-max))) ?\n) | |
1510 | (or (eq require-final-newline t) | |
1511 | (and require-final-newline | |
1512 | (y-or-n-p | |
1513 | (format "Buffer %s does not end in newline. Add one? " | |
1514 | (buffer-name))))) | |
1515 | (save-excursion | |
1516 | (goto-char (point-max)) | |
1517 | (insert ?\n))) | |
c9dca4e0 RS |
1518 | (let ((hooks (append write-contents-hooks local-write-file-hooks |
1519 | write-file-hooks)) | |
b4da00e9 RM |
1520 | (done nil)) |
1521 | (while (and hooks | |
1522 | (not (setq done (funcall (car hooks))))) | |
1523 | (setq hooks (cdr hooks))) | |
1524 | ;; If a hook returned t, file is already "written". | |
1525 | (cond ((not done) | |
1526 | (if (not (file-writable-p buffer-file-name)) | |
1527 | (let ((dir (file-name-directory buffer-file-name))) | |
1528 | (if (not (file-directory-p dir)) | |
1529 | (error "%s is not a directory" dir) | |
1530 | (if (not (file-exists-p buffer-file-name)) | |
1531 | (error "Directory %s write-protected" dir) | |
1532 | (if (yes-or-no-p | |
1533 | (format "File %s is write-protected; try to save anyway? " | |
1534 | (file-name-nondirectory | |
1535 | buffer-file-name))) | |
1536 | (setq tempsetmodes t) | |
1537 | (error "Attempt to save to a file which you aren't allowed to write")))))) | |
1538 | (or buffer-backed-up | |
1539 | (setq setmodes (backup-buffer))) | |
1540 | (if file-precious-flag | |
f3e23606 RS |
1541 | ;; If file is precious, write temp name, then rename it. |
1542 | (let ((dir (file-name-directory buffer-file-name)) | |
1543 | (realname buffer-file-name) | |
1544 | tempname temp nogood i succeed) | |
1545 | (setq i 0) | |
1546 | (setq nogood t) | |
1547 | ;; Find the temporary name to write under. | |
1548 | (while nogood | |
1549 | (setq tempname (format "%s#tmp#%d" dir i)) | |
1550 | (setq nogood (file-exists-p tempname)) | |
1551 | (setq i (1+ i))) | |
b4da00e9 RM |
1552 | (unwind-protect |
1553 | (progn (clear-visited-file-modtime) | |
1554 | (write-region (point-min) (point-max) | |
f3e23606 RS |
1555 | tempname nil realname) |
1556 | (setq succeed t)) | |
1557 | ;; If writing the temp file fails, | |
1558 | ;; delete the temp file. | |
1559 | (or succeed (delete-file tempname))) | |
b411d947 JB |
1560 | ;; Since we have created an entirely new file |
1561 | ;; and renamed it, make sure it gets the | |
1562 | ;; right permission bits set. | |
1563 | (setq setmodes (file-modes buffer-file-name)) | |
f3e23606 RS |
1564 | ;; We succeeded in writing the temp file, |
1565 | ;; so rename it. | |
1566 | (rename-file tempname buffer-file-name t)) | |
b4da00e9 RM |
1567 | ;; If file not writable, see if we can make it writable |
1568 | ;; temporarily while we write it. | |
1569 | ;; But no need to do so if we have just backed it up | |
1570 | ;; (setmodes is set) because that says we're superseding. | |
1571 | (cond ((and tempsetmodes (not setmodes)) | |
1572 | ;; Change the mode back, after writing. | |
1573 | (setq setmodes (file-modes buffer-file-name)) | |
1574 | (set-file-modes buffer-file-name 511))) | |
1575 | (write-region (point-min) (point-max) | |
1576 | buffer-file-name nil t))))) | |
f3e23606 | 1577 | (setq buffer-file-number (nth 10 (file-attributes buffer-file-name))) |
b4da00e9 RM |
1578 | (if setmodes |
1579 | (condition-case () | |
f3e23606 | 1580 | (set-file-modes buffer-file-name setmodes) |
b4da00e9 RM |
1581 | (error nil)))) |
1582 | ;; If the auto-save file was recent before this command, | |
1583 | ;; delete it now. | |
1584 | (delete-auto-save-file-if-necessary recent-save) | |
1bf3d475 | 1585 | (run-hooks 'after-save-hook)) |
b4da00e9 RM |
1586 | (message "(No changes need to be saved)"))) |
1587 | ||
b4da00e9 RM |
1588 | (defun save-some-buffers (&optional arg exiting) |
1589 | "Save some modified file-visiting buffers. Asks user about each one. | |
5bbbceb1 JB |
1590 | Optional argument (the prefix) non-nil means save all with no questions. |
1591 | Optional second argument EXITING means ask about certain non-file buffers | |
1592 | as well as about file buffers." | |
b4da00e9 | 1593 | (interactive "P") |
907482b9 | 1594 | (save-window-excursion |
5625c2fc RS |
1595 | (let ((files-done |
1596 | (map-y-or-n-p | |
1597 | (function | |
1598 | (lambda (buffer) | |
1599 | (and (buffer-modified-p buffer) | |
1600 | (or | |
1601 | (buffer-file-name buffer) | |
1602 | (and exiting | |
1603 | (progn | |
1604 | (set-buffer buffer) | |
1605 | (and buffer-offer-save (> (buffer-size) 0))))) | |
1606 | (if arg | |
1607 | t | |
1608 | (if (buffer-file-name buffer) | |
1609 | (format "Save file %s? " | |
1610 | (buffer-file-name buffer)) | |
1611 | (format "Save buffer %s? " | |
1612 | (buffer-name buffer))))))) | |
1613 | (function | |
1614 | (lambda (buffer) | |
1615 | (set-buffer buffer) | |
1616 | (save-buffer))) | |
1617 | (buffer-list) | |
1618 | '("buffer" "buffers" "save") | |
1619 | (list (list ?\C-r (lambda (buf) | |
1620 | (view-buffer buf) | |
1621 | (setq view-exit-action | |
1622 | '(lambda (ignore) | |
1623 | (exit-recursive-edit))) | |
1624 | (recursive-edit) | |
1625 | ;; Return nil to ask about BUF again. | |
1626 | nil) | |
1627 | "display the current buffer")))) | |
1628 | (abbrevs-done | |
1629 | (and save-abbrevs abbrevs-changed | |
1630 | (progn | |
1631 | (if (or arg | |
1632 | (y-or-n-p (format "Save abbrevs in %s? " abbrev-file-name))) | |
1633 | (write-abbrev-file nil)) | |
1634 | ;; Don't keep bothering user if he says no. | |
1635 | (setq abbrevs-changed nil) | |
1636 | t)))) | |
1637 | (or (> files-done 0) abbrevs-done | |
1638 | (message "(No files need saving)"))))) | |
b4da00e9 RM |
1639 | \f |
1640 | (defun not-modified (&optional arg) | |
1641 | "Mark current buffer as unmodified, not needing to be saved. | |
1642 | With prefix arg, mark buffer as modified, so \\[save-buffer] will save." | |
1643 | (interactive "P") | |
1644 | (message (if arg "Modification-flag set" | |
1645 | "Modification-flag cleared")) | |
1646 | (set-buffer-modified-p arg)) | |
1647 | ||
1648 | (defun toggle-read-only (&optional arg) | |
1649 | "Change whether this buffer is visiting its file read-only. | |
1650 | With arg, set read-only iff arg is positive." | |
1651 | (interactive "P") | |
1652 | (setq buffer-read-only | |
1653 | (if (null arg) | |
1654 | (not buffer-read-only) | |
1655 | (> (prefix-numeric-value arg) 0))) | |
1656 | ;; Force mode-line redisplay | |
1657 | (set-buffer-modified-p (buffer-modified-p))) | |
1658 | ||
1659 | (defun insert-file (filename) | |
1660 | "Insert contents of file FILENAME into buffer after point. | |
1661 | Set mark after the inserted text. | |
1662 | ||
1663 | This function is meant for the user to run interactively. | |
1664 | Don't call it from programs! Use `insert-file-contents' instead. | |
1665 | \(Its calling sequence is different; see its documentation)." | |
6f931919 | 1666 | (interactive "*fInsert file: ") |
3be6243a RS |
1667 | (if (file-directory-p filename) |
1668 | (signal 'file-error (list "Opening input file" "file is a directory" | |
1669 | filename))) | |
b4da00e9 RM |
1670 | (let ((tem (insert-file-contents filename))) |
1671 | (push-mark (+ (point) (car (cdr tem)))))) | |
1672 | ||
1673 | (defun append-to-file (start end filename) | |
1674 | "Append the contents of the region to the end of file FILENAME. | |
1675 | When called from a function, expects three arguments, | |
1676 | START, END and FILENAME. START and END are buffer positions | |
1677 | saying what text to write." | |
1678 | (interactive "r\nFAppend to file: ") | |
1679 | (write-region start end filename t)) | |
1680 | ||
1681 | (defun file-newest-backup (filename) | |
1682 | "Return most recent backup file for FILENAME or nil if no backups exist." | |
1683 | (let* ((filename (expand-file-name filename)) | |
1684 | (file (file-name-nondirectory filename)) | |
1685 | (dir (file-name-directory filename)) | |
1686 | (comp (file-name-all-completions file dir)) | |
1687 | newest) | |
1688 | (while comp | |
1689 | (setq file (concat dir (car comp)) | |
1690 | comp (cdr comp)) | |
1691 | (if (and (backup-file-name-p file) | |
1692 | (or (null newest) (file-newer-than-file-p file newest))) | |
1693 | (setq newest file))) | |
1694 | newest)) | |
1695 | ||
1696 | (defun rename-uniquely () | |
1697 | "Rename current buffer to a similar name not already taken. | |
1698 | This function is useful for creating multiple shell process buffers | |
1699 | or multiple mail buffers, etc." | |
1700 | (interactive) | |
1701 | (let* ((new-buf (generate-new-buffer (buffer-name))) | |
1702 | (name (buffer-name new-buf))) | |
1703 | (kill-buffer new-buf) | |
1704 | (rename-buffer name) | |
1705 | (set-buffer-modified-p (buffer-modified-p)))) ; force mode line update | |
5bbbceb1 | 1706 | |
4e43240a | 1707 | (defun make-directory (dir &optional parents) |
5ce8bb89 RS |
1708 | "Create the directory DIR and any nonexistent parent dirs. |
1709 | Interactively, the default choice of directory to create | |
1710 | is the current default directory for file names. | |
1711 | That is useful when you have visited a file in a nonexistint directory. | |
1712 | ||
1713 | Noninteractively, the second (optional) argument PARENTS says whether | |
1714 | to create parent directories if they don't exist." | |
1715 | (interactive | |
1716 | (list (read-file-name "Make directory: " default-directory default-directory | |
1717 | nil nil) | |
1718 | t)) | |
5dbfdacd | 1719 | (let ((handler (find-file-name-handler dir))) |
4e43240a RS |
1720 | (if handler |
1721 | (funcall handler 'make-directory dir parents) | |
1722 | (if (not parents) | |
1723 | (make-directory-internal dir) | |
1724 | (let ((dir (directory-file-name (expand-file-name dir))) | |
1725 | create-list) | |
1726 | (while (not (file-exists-p dir)) | |
1727 | (setq create-list (cons dir create-list) | |
1728 | dir (directory-file-name (file-name-directory dir)))) | |
1729 | (while create-list | |
1730 | (make-directory-internal (car create-list)) | |
1731 | (setq create-list (cdr create-list)))))))) | |
b4da00e9 RM |
1732 | \f |
1733 | (put 'revert-buffer-function 'permanent-local t) | |
1734 | (defvar revert-buffer-function nil | |
1735 | "Function to use to revert this buffer, or nil to do the default.") | |
1736 | ||
1737 | (put 'revert-buffer-insert-file-contents-function 'permanent-local t) | |
1738 | (defvar revert-buffer-insert-file-contents-function nil | |
1739 | "Function to use to insert contents when reverting this buffer. | |
1740 | Gets two args, first the nominal file name to use, | |
1741 | and second, t if reading the auto-save file.") | |
1742 | ||
1ab31687 | 1743 | (defun revert-buffer (&optional ignore-auto noconfirm) |
b4da00e9 RM |
1744 | "Replace the buffer text with the text of the visited file on disk. |
1745 | This undoes all changes since the file was visited or saved. | |
8c0e7b73 JB |
1746 | With a prefix argument, offer to revert from latest auto-save file, if |
1747 | that is more recent than the visited file. | |
1ab31687 | 1748 | |
fc51b251 | 1749 | When called from lisp, The first argument is IGNORE-AUTO; only offer |
1ab31687 JB |
1750 | to revert from the auto-save file when this is nil. Note that the |
1751 | sense of this argument is the reverse of the prefix argument, for the | |
1752 | sake of backward compatibility. IGNORE-AUTO is optional, defaulting | |
1753 | to nil. | |
1754 | ||
1755 | Optional second argument NOCONFIRM means don't ask for confirmation at | |
1756 | all. | |
b4da00e9 | 1757 | |
8c0e7b73 | 1758 | If the value of `revert-buffer-function' is non-nil, it is called to |
fb6208a6 RS |
1759 | do the work. |
1760 | ||
4fbf62ee KH |
1761 | The default revert function runs the hook `before-revert-hook' at the |
1762 | beginning and `after-revert-hook' at the end." | |
1ab31687 JB |
1763 | ;; I admit it's odd to reverse the sense of the prefix argument, but |
1764 | ;; there is a lot of code out there which assumes that the first | |
1765 | ;; argument should be t to avoid consulting the auto-save file, and | |
1766 | ;; there's no straightforward way to encourage authors to notice a | |
1767 | ;; reversal of the argument sense. So I'm just changing the user | |
1768 | ;; interface, but leaving the programmatic interface the same. | |
1769 | (interactive (list (not prefix-arg))) | |
b4da00e9 | 1770 | (if revert-buffer-function |
1ab31687 | 1771 | (funcall revert-buffer-function ignore-auto noconfirm) |
b4da00e9 | 1772 | (let* ((opoint (point)) |
1ab31687 JB |
1773 | (auto-save-p (and (not ignore-auto) |
1774 | (recent-auto-save-p) | |
b4da00e9 RM |
1775 | buffer-auto-save-file-name |
1776 | (file-readable-p buffer-auto-save-file-name) | |
1777 | (y-or-n-p | |
1778 | "Buffer has been auto-saved recently. Revert from auto-save file? "))) | |
1779 | (file-name (if auto-save-p | |
1780 | buffer-auto-save-file-name | |
1781 | buffer-file-name))) | |
1782 | (cond ((null file-name) | |
1783 | (error "Buffer does not seem to be associated with any file")) | |
1784 | ((or noconfirm | |
1785 | (yes-or-no-p (format "Revert buffer from file %s? " | |
1786 | file-name))) | |
4fbf62ee | 1787 | (run-hooks 'before-revert-hook) |
b4da00e9 RM |
1788 | ;; If file was backed up but has changed since, |
1789 | ;; we shd make another backup. | |
1790 | (and (not auto-save-p) | |
5bbbceb1 | 1791 | (not (verify-visited-file-modtime (current-buffer))) |
b4da00e9 RM |
1792 | (setq buffer-backed-up nil)) |
1793 | ;; Get rid of all undo records for this buffer. | |
1794 | (or (eq buffer-undo-list t) | |
1795 | (setq buffer-undo-list nil)) | |
1796 | (let ((buffer-read-only nil) | |
1797 | ;; Don't make undo records for the reversion. | |
1798 | (buffer-undo-list t)) | |
1799 | (if revert-buffer-insert-file-contents-function | |
1800 | (funcall revert-buffer-insert-file-contents-function | |
1801 | file-name auto-save-p) | |
1802 | (if (not (file-exists-p file-name)) | |
1803 | (error "File %s no longer exists!" file-name)) | |
1804 | ;; Bind buffer-file-name to nil | |
1805 | ;; so that we don't try to lock the file. | |
1806 | (let ((buffer-file-name nil)) | |
1807 | (or auto-save-p | |
f9456b0a RS |
1808 | (unlock-buffer))) |
1809 | (insert-file-contents file-name (not auto-save-p) | |
1810 | nil nil t))) | |
b4da00e9 | 1811 | (goto-char (min opoint (point-max))) |
8cfb9d46 | 1812 | (after-find-file nil nil t) |
4fbf62ee KH |
1813 | (run-hooks 'after-revert-hook) |
1814 | t))))) | |
b4da00e9 RM |
1815 | |
1816 | (defun recover-file (file) | |
1817 | "Visit file FILE, but get contents from its last auto-save file." | |
1818 | (interactive | |
1819 | (let ((prompt-file buffer-file-name) | |
1820 | (file-name nil) | |
1821 | (file-dir nil)) | |
1822 | (and prompt-file | |
1823 | (setq file-name (file-name-nondirectory prompt-file) | |
1824 | file-dir (file-name-directory prompt-file))) | |
1825 | (list (read-file-name "Recover file: " | |
1826 | file-dir nil nil file-name)))) | |
1827 | (setq file (expand-file-name file)) | |
f7da6740 RS |
1828 | (if (auto-save-file-name-p (file-name-nondirectory file)) |
1829 | (error "%s is an auto-save file" file)) | |
b4da00e9 RM |
1830 | (let ((file-name (let ((buffer-file-name file)) |
1831 | (make-auto-save-file-name)))) | |
1832 | (cond ((not (file-newer-than-file-p file-name file)) | |
1833 | (error "Auto-save file %s not current" file-name)) | |
1834 | ((save-window-excursion | |
1835 | (if (not (eq system-type 'vax-vms)) | |
1836 | (with-output-to-temp-buffer "*Directory*" | |
1837 | (buffer-disable-undo standard-output) | |
1838 | (call-process "ls" nil standard-output nil | |
2dc2b736 RS |
1839 | (if (file-symlink-p file) "-lL" "-l") |
1840 | file file-name))) | |
b4da00e9 RM |
1841 | (yes-or-no-p (format "Recover auto save file %s? " file-name))) |
1842 | (switch-to-buffer (find-file-noselect file t)) | |
1843 | (let ((buffer-read-only nil)) | |
1844 | (erase-buffer) | |
1845 | (insert-file-contents file-name nil)) | |
8cfb9d46 | 1846 | (after-find-file nil nil t)) |
b4da00e9 RM |
1847 | (t (error "Recover-file cancelled."))))) |
1848 | ||
1849 | (defun kill-some-buffers () | |
1850 | "For each buffer, ask whether to kill it." | |
1851 | (interactive) | |
1852 | (let ((list (buffer-list))) | |
1853 | (while list | |
1854 | (let* ((buffer (car list)) | |
1855 | (name (buffer-name buffer))) | |
1856 | (and (not (string-equal name "")) | |
1857 | (/= (aref name 0) ? ) | |
1858 | (yes-or-no-p | |
1859 | (format "Buffer %s %s. Kill? " | |
1860 | name | |
1861 | (if (buffer-modified-p buffer) | |
1862 | "HAS BEEN EDITED" "is unmodified"))) | |
1863 | (kill-buffer buffer))) | |
1864 | (setq list (cdr list))))) | |
1865 | \f | |
1866 | (defun auto-save-mode (arg) | |
1867 | "Toggle auto-saving of contents of current buffer. | |
f3e23606 | 1868 | With prefix argument ARG, turn auto-saving on if positive, else off." |
b4da00e9 RM |
1869 | (interactive "P") |
1870 | (setq buffer-auto-save-file-name | |
1871 | (and (if (null arg) | |
1872 | (not buffer-auto-save-file-name) | |
1873 | (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0)))) | |
1874 | (if (and buffer-file-name auto-save-visited-file-name | |
1875 | (not buffer-read-only)) | |
1876 | buffer-file-name | |
1877 | (make-auto-save-file-name)))) | |
1878 | (if (interactive-p) | |
1879 | (message "Auto-save %s (in this buffer)" | |
1880 | (if buffer-auto-save-file-name "on" "off"))) | |
1881 | buffer-auto-save-file-name) | |
1882 | ||
1883 | (defun rename-auto-save-file () | |
1884 | "Adjust current buffer's auto save file name for current conditions. | |
1885 | Also rename any existing auto save file, if it was made in this session." | |
1886 | (let ((osave buffer-auto-save-file-name)) | |
1887 | (setq buffer-auto-save-file-name | |
1888 | (make-auto-save-file-name)) | |
1889 | (if (and osave buffer-auto-save-file-name | |
1890 | (not (string= buffer-auto-save-file-name buffer-file-name)) | |
1891 | (not (string= buffer-auto-save-file-name osave)) | |
1892 | (file-exists-p osave) | |
1893 | (recent-auto-save-p)) | |
1894 | (rename-file osave buffer-auto-save-file-name t)))) | |
1895 | ||
1896 | (defun make-auto-save-file-name () | |
1897 | "Return file name to use for auto-saves of current buffer. | |
1898 | Does not consider `auto-save-visited-file-name' as that variable is checked | |
1899 | before calling this function. You can redefine this for customization. | |
1900 | See also `auto-save-file-name-p'." | |
1901 | (if buffer-file-name | |
1902 | (concat (file-name-directory buffer-file-name) | |
1903 | "#" | |
1904 | (file-name-nondirectory buffer-file-name) | |
1905 | "#") | |
1906 | ;; For non-file bfr, use bfr name and Emacs pid. | |
1907 | (expand-file-name (format "#%s#%s#" (buffer-name) (make-temp-name ""))))) | |
1908 | ||
1909 | (defun auto-save-file-name-p (filename) | |
1910 | "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'. | |
1911 | FILENAME should lack slashes. You can redefine this for customization." | |
1912 | (string-match "^#.*#$" filename)) | |
1913 | \f | |
1914 | (defconst list-directory-brief-switches | |
1915 | (if (eq system-type 'vax-vms) "" "-CF") | |
1916 | "*Switches for list-directory to pass to `ls' for brief listing,") | |
1917 | ||
1918 | (defconst list-directory-verbose-switches | |
1919 | (if (eq system-type 'vax-vms) | |
1920 | "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)" | |
1921 | "-l") | |
1922 | "*Switches for list-directory to pass to `ls' for verbose listing,") | |
1923 | ||
1924 | (defun list-directory (dirname &optional verbose) | |
1925 | "Display a list of files in or matching DIRNAME, a la `ls'. | |
1926 | DIRNAME is globbed by the shell if necessary. | |
1927 | Prefix arg (second arg if noninteractive) means supply -l switch to `ls'. | |
1928 | Actions controlled by variables `list-directory-brief-switches' | |
1929 | and `list-directory-verbose-switches'." | |
1930 | (interactive (let ((pfx current-prefix-arg)) | |
1931 | (list (read-file-name (if pfx "List directory (verbose): " | |
1932 | "List directory (brief): ") | |
1933 | nil default-directory nil) | |
1934 | pfx))) | |
1935 | (let ((switches (if verbose list-directory-verbose-switches | |
1936 | list-directory-brief-switches))) | |
1937 | (or dirname (setq dirname default-directory)) | |
1938 | (setq dirname (expand-file-name dirname)) | |
1939 | (with-output-to-temp-buffer "*Directory*" | |
1940 | (buffer-disable-undo standard-output) | |
1941 | (princ "Directory ") | |
1942 | (princ dirname) | |
1943 | (terpri) | |
c3554e95 RS |
1944 | (save-excursion |
1945 | (set-buffer "*Directory*") | |
1946 | (let ((wildcard (not (file-directory-p dirname)))) | |
1947 | (insert-directory dirname switches wildcard (not wildcard))))))) | |
1948 | ||
1949 | (defvar insert-directory-program "ls" | |
1950 | "Absolute or relative name of the `ls' program used by `insert-directory'.") | |
1951 | ||
1952 | ;; insert-directory | |
1953 | ;; - must insert _exactly_one_line_ describing FILE if WILDCARD and | |
1954 | ;; FULL-DIRECTORY-P is nil. | |
1955 | ;; The single line of output must display FILE's name as it was | |
1956 | ;; given, namely, an absolute path name. | |
1957 | ;; - must insert exactly one line for each file if WILDCARD or | |
1958 | ;; FULL-DIRECTORY-P is t, plus one optional "total" line | |
1959 | ;; before the file lines, plus optional text after the file lines. | |
1960 | ;; Lines are delimited by "\n", so filenames containing "\n" are not | |
1961 | ;; allowed. | |
1962 | ;; File lines should display the basename. | |
1963 | ;; - must be consistent with | |
1964 | ;; - functions dired-move-to-filename, (these two define what a file line is) | |
1965 | ;; dired-move-to-end-of-filename, | |
1966 | ;; dired-between-files, (shortcut for (not (dired-move-to-filename))) | |
1967 | ;; dired-insert-headerline | |
1968 | ;; dired-after-subdir-garbage (defines what a "total" line is) | |
1969 | ;; - variable dired-subdir-regexp | |
1970 | (defun insert-directory (file switches &optional wildcard full-directory-p) | |
a18b7c81 | 1971 | "Insert directory listing for FILE, formatted according to SWITCHES. |
c3554e95 RS |
1972 | Leaves point after the inserted text. |
1973 | Optional third arg WILDCARD means treat FILE as shell wildcard. | |
1974 | Optional fourth arg FULL-DIRECTORY-P means file is a directory and | |
1975 | switches do not contain `d', so that a full listing is expected. | |
1976 | ||
1977 | This works by running a directory listing program | |
406e12d9 | 1978 | whose name is in the variable `insert-directory-program'. |
c3554e95 | 1979 | If WILDCARD, it also runs the shell specified by `shell-file-name'." |
5dbfdacd | 1980 | (let ((handler (find-file-name-handler file))) |
c3554e95 RS |
1981 | (if handler |
1982 | (funcall handler 'insert-directory file switches | |
1983 | wildcard full-directory-p) | |
b4da00e9 | 1984 | (if (eq system-type 'vax-vms) |
c3554e95 RS |
1985 | (vms-read-directory file switches (current-buffer)) |
1986 | (if wildcard | |
a9fa0bd5 RS |
1987 | ;; Run ls in the directory of the file pattern we asked for. |
1988 | (let ((default-directory | |
1989 | (if (file-name-absolute-p file) | |
1990 | (file-name-directory file) | |
1991 | (file-name-directory (expand-file-name file))))) | |
c3554e95 RS |
1992 | (call-process shell-file-name nil t nil |
1993 | "-c" (concat insert-directory-program | |
1994 | " -d " switches " " | |
1995 | (file-name-nondirectory file)))) | |
a18b7c81 JB |
1996 | ;; SunOS 4.1.3, SVr4 and others need the "." to list the |
1997 | ;; directory if FILE is a symbolic link. | |
1998 | (call-process insert-directory-program nil t nil switches | |
1999 | (if full-directory-p | |
2000 | (concat (file-name-as-directory file) ".") | |
2001 | file))))))) | |
b4da00e9 | 2002 | |
88902b35 RS |
2003 | (defvar kill-emacs-query-functions nil |
2004 | "Functions to call with no arguments to query about killing Emacs.") | |
2005 | ||
b4da00e9 RM |
2006 | (defun save-buffers-kill-emacs (&optional arg) |
2007 | "Offer to save each buffer, then kill this Emacs process. | |
2008 | With prefix arg, silently save all file-visiting buffers, then kill." | |
2009 | (interactive "P") | |
2010 | (save-some-buffers arg t) | |
2011 | (and (or (not (memq t (mapcar (function | |
2012 | (lambda (buf) (and (buffer-file-name buf) | |
2013 | (buffer-modified-p buf)))) | |
2014 | (buffer-list)))) | |
2015 | (yes-or-no-p "Modified buffers exist; exit anyway? ")) | |
2016 | (or (not (fboundp 'process-list)) | |
2017 | ;; process-list is not defined on VMS. | |
2018 | (let ((processes (process-list)) | |
2019 | active) | |
2020 | (while processes | |
528415e7 | 2021 | (and (memq (process-status (car processes)) '(run stop open)) |
b4da00e9 RM |
2022 | (let ((val (process-kill-without-query (car processes)))) |
2023 | (process-kill-without-query (car processes) val) | |
2024 | val) | |
2025 | (setq active t)) | |
2026 | (setq processes (cdr processes))) | |
2027 | (or (not active) | |
2028 | (yes-or-no-p "Active processes exist; kill them and exit anyway? ")))) | |
88902b35 RS |
2029 | ;; Query the user for other things, perhaps. |
2030 | (let ((functions kill-emacs-query-functions) | |
2031 | (yes t)) | |
2032 | (while (and functions yes) | |
2033 | (setq yes (and yes (funcall (car functions)))) | |
2034 | (setq functions (cdr functions))) | |
2035 | yes) | |
b4da00e9 RM |
2036 | (kill-emacs))) |
2037 | \f | |
2038 | (define-key ctl-x-map "\C-f" 'find-file) | |
2039 | (define-key ctl-x-map "\C-q" 'toggle-read-only) | |
2040 | (define-key ctl-x-map "\C-r" 'find-file-read-only) | |
2041 | (define-key ctl-x-map "\C-v" 'find-alternate-file) | |
2042 | (define-key ctl-x-map "\C-s" 'save-buffer) | |
2043 | (define-key ctl-x-map "s" 'save-some-buffers) | |
2044 | (define-key ctl-x-map "\C-w" 'write-file) | |
2045 | (define-key ctl-x-map "i" 'insert-file) | |
2046 | (define-key esc-map "~" 'not-modified) | |
2047 | (define-key ctl-x-map "\C-d" 'list-directory) | |
2048 | (define-key ctl-x-map "\C-c" 'save-buffers-kill-emacs) | |
2049 | ||
2050 | (define-key ctl-x-4-map "f" 'find-file-other-window) | |
2051 | (define-key ctl-x-4-map "r" 'find-file-read-only-other-window) | |
2052 | (define-key ctl-x-4-map "\C-f" 'find-file-other-window) | |
2053 | (define-key ctl-x-4-map "b" 'switch-to-buffer-other-window) | |
924f0a24 | 2054 | (define-key ctl-x-4-map "\C-o" 'display-buffer) |
5bbbceb1 | 2055 | |
f98955ea JB |
2056 | (define-key ctl-x-5-map "b" 'switch-to-buffer-other-frame) |
2057 | (define-key ctl-x-5-map "f" 'find-file-other-frame) | |
2058 | (define-key ctl-x-5-map "\C-f" 'find-file-other-frame) | |
2059 | (define-key ctl-x-5-map "r" 'find-file-read-only-other-frame) | |
c0274f38 ER |
2060 | |
2061 | ;;; files.el ends here |