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b4da00e9 RM |
1 | ;; File input and output commands for Emacs |
2 | ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc. | |
3 | ||
4 | ;; This file is part of GNU Emacs. | |
5 | ||
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 1, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | ||
20 | (defconst delete-auto-save-files t | |
21 | "*Non-nil means delete a buffer's auto-save file when the buffer is saved.") | |
22 | ||
23 | (defconst directory-abbrev-alist | |
24 | nil | |
25 | "*Alist of abbreviations for file directories. | |
26 | A list of elements of the form (FROM . TO), each meaning to replace | |
27 | FROM with TO when it appears in a directory name. This replacement is | |
28 | done when setting up the default directory of a newly visited file. | |
29 | *Every* FROM string should start with `^'. | |
30 | ||
31 | Use this feature when you have directories which you normally refer to | |
32 | via absolute symbolic links. Make TO the name of the link, and FROM | |
33 | the name it is linked to.") | |
34 | ||
35 | ;;; Turn off backup files on VMS since it has version numbers. | |
36 | (defconst make-backup-files (not (eq system-type 'vax-vms)) | |
37 | "*Create a backup of each file when it is saved for the first time. | |
38 | This can be done by renaming the file or by copying. | |
39 | ||
40 | Renaming means that Emacs renames the existing file so that it is a | |
41 | backup file, then writes the buffer into a new file. Any other names | |
42 | that the old file had will now refer to the backup file. The new file | |
43 | is owned by you and its group is defaulted. | |
44 | ||
45 | Copying means that Emacs copies the existing file into the backup | |
46 | file, then writes the buffer on top of the existing file. Any other | |
47 | names that the old file had will now refer to the new (edited) file. | |
48 | The file's owner and group are unchanged. | |
49 | ||
50 | The choice of renaming or copying is controlled by the variables | |
51 | `backup-by-copying', `backup-by-copying-when-linked' and | |
52 | `backup-by-copying-when-mismatch'.") | |
53 | ||
54 | ;; Do this so that local variables based on the file name | |
55 | ;; are not overridden by the major mode. | |
56 | (defvar backup-inhibited nil | |
57 | "Non-nil means don't make a backup file for this buffer.") | |
58 | (put 'backup-inhibited 'permanent-local t) | |
59 | ||
60 | (defconst backup-by-copying nil | |
61 | "*Non-nil means always use copying to create backup files. | |
62 | See documentation of variable `make-backup-files'.") | |
63 | ||
64 | (defconst backup-by-copying-when-linked nil | |
65 | "*Non-nil means use copying to create backups for files with multiple names. | |
66 | This causes the alternate names to refer to the latest version as edited. | |
67 | This variable is relevant only if `backup-by-copying' is nil.") | |
68 | ||
69 | (defconst backup-by-copying-when-mismatch nil | |
70 | "*Non-nil means create backups by copying if this preserves owner or group. | |
71 | Renaming may still be used (subject to control of other variables) | |
72 | when it would not result in changing the owner or group of the file; | |
73 | that is, for files which are owned by you and whose group matches | |
74 | the default for a new file created there by you. | |
75 | This variable is relevant only if `backup-by-copying' is nil.") | |
76 | ||
77 | (defvar backup-enable-predicate | |
78 | '(lambda (name) | |
79 | (or (< (length name) 5) | |
80 | (not (string-equal "/tmp/" (substring name 0 5))))) | |
81 | "Predicate that looks at a file name and decides whether to make backups. | |
82 | Called with an absolute file name as argument, it returns t to enable backup.") | |
83 | ||
84 | (defconst buffer-offer-save nil | |
85 | "*Non-nil in a buffer means offer to save the buffer on exit | |
86 | even if the buffer is not visiting a file. | |
87 | Automatically local in all buffers.") | |
88 | (make-variable-buffer-local 'buffer-offer-save) | |
89 | ||
90 | (defconst file-precious-flag nil | |
91 | "*Non-nil means protect against I/O errors while saving files. | |
92 | Some modes set this non-nil in particular buffers.") | |
93 | ||
94 | (defvar version-control nil | |
95 | "*Control use of version numbers for backup files. | |
96 | t means make numeric backup versions unconditionally. | |
97 | nil means make them for files that have some already. | |
98 | never means do not make them.") | |
99 | ||
100 | (defvar dired-kept-versions 2 | |
101 | "*When cleaning directory, number of versions to keep.") | |
102 | ||
103 | (defvar trim-versions-without-asking nil | |
104 | "*If true, deletes excess backup versions silently. | |
105 | Otherwise asks confirmation.") | |
106 | ||
107 | (defvar kept-old-versions 2 | |
108 | "*Number of oldest versions to keep when a new numbered backup is made.") | |
109 | ||
110 | (defvar kept-new-versions 2 | |
111 | "*Number of newest versions to keep when a new numbered backup is made. | |
112 | Includes the new backup. Must be > 0") | |
113 | ||
114 | (defconst require-final-newline nil | |
115 | "*Value of t says silently ensure a file ends in a newline when it is saved. | |
116 | Non-nil but not t says ask user whether to add a newline when there isn't one. | |
117 | nil means don't add newlines.") | |
118 | ||
119 | (defconst auto-save-default t | |
120 | "*Non-nil says by default do auto-saving of every file-visiting buffer.") | |
121 | ||
122 | (defconst auto-save-visited-file-name nil | |
123 | "*Non-nil says auto-save a buffer in the file it is visiting, when practical. | |
124 | Normally auto-save files are written under other names.") | |
125 | ||
126 | (defconst save-abbrevs nil | |
127 | "*Non-nil means save word abbrevs too when files are saved. | |
128 | Loading an abbrev file sets this to t.") | |
129 | ||
130 | (defconst find-file-run-dired t | |
131 | "*Non-nil says run dired if find-file is given the name of a directory.") | |
132 | ||
133 | (put 'find-file-not-found-hooks 'permanent-local t) | |
134 | (defvar find-file-not-found-hooks nil | |
135 | "List of functions to be called for `find-file' on nonexistent file. | |
136 | These functions are called as soon as the error is detected. | |
137 | `buffer-file-name' is already set up. | |
138 | The functions are called in the order given until one of them returns non-nil.") | |
139 | ||
140 | (put 'find-file-hooks 'permanent-local t) | |
141 | (defvar find-file-hooks nil | |
142 | "List of functions to be called after a buffer is loaded from a file. | |
143 | The buffer's local variables (if any) will have been processed before the | |
144 | functions are called.") | |
145 | ||
146 | (put 'write-file-hooks 'permanent-local t) | |
147 | (defvar write-file-hooks nil | |
148 | "List of functions to be called before writing out a buffer to a file. | |
149 | If one of them returns non-nil, the file is considered already written | |
150 | and the rest are not called.") | |
151 | ||
152 | (defconst enable-local-variables t | |
153 | "*Control use of local-variables lists in files you visit. | |
154 | The value can be t, nil or something else. | |
155 | A value of t means local-variables lists are obeyed; | |
156 | nil means they are ignored; anything else means query. | |
157 | ||
158 | The command \\[normal-mode] always obeys local-variables lists | |
159 | and ignores this variable.") | |
160 | ||
161 | (defconst ignore-local-eval nil | |
162 | "*Non-nil means ignore the \"variable\" `eval' in a file's local variables. | |
163 | This applies when the local-variables list is scanned automatically | |
164 | after you find a file. If you explicitly request such a scan with | |
165 | \\[normal-mode], there is no query, regardless of this variable.") | |
166 | ||
167 | ;; Avoid losing in versions where CLASH_DETECTION is disabled. | |
168 | (or (fboundp 'lock-buffer) | |
169 | (fset 'lock-buffer 'ignore)) | |
170 | (or (fboundp 'unlock-buffer) | |
171 | (fset 'unlock-buffer 'ignore)) | |
172 | \f | |
173 | (defun pwd () | |
174 | "Show the current default directory." | |
175 | (interactive nil) | |
176 | (message "Directory %s" default-directory)) | |
177 | ||
178 | (defun cd (dir) | |
179 | "Make DIR become the current buffer's default directory." | |
180 | (interactive "DChange default directory: ") | |
181 | (setq dir (expand-file-name dir)) | |
182 | (if (not (eq system-type 'vax-vms)) | |
183 | (setq dir (file-name-as-directory dir))) | |
184 | (if (not (file-directory-p dir)) | |
185 | (error "%s is not a directory" dir) | |
186 | (if (file-executable-p dir) | |
187 | (setq default-directory dir) | |
188 | (error "Cannot cd to %s: Permission denied" dir))) | |
189 | (pwd)) | |
190 | ||
191 | (defun load-file (file) | |
192 | "Load the Lisp file named FILE." | |
193 | (interactive "fLoad file: ") | |
194 | (load (expand-file-name file) nil nil t)) | |
195 | ||
196 | (defun load-library (library) | |
197 | "Load the library named LIBRARY. | |
198 | This is an interface to the function `load'." | |
199 | (interactive "sLoad library: ") | |
200 | (load library)) | |
201 | \f | |
202 | (defun switch-to-buffer-other-window (buffer) | |
203 | "Select buffer BUFFER in another window." | |
204 | (interactive "BSwitch to buffer in other window: ") | |
205 | (let ((pop-up-windows t)) | |
206 | (pop-to-buffer buffer t))) | |
207 | ||
208 | (defun find-file (filename) | |
209 | "Edit file FILENAME. | |
210 | Switch to a buffer visiting file FILENAME, | |
211 | creating one if none already exists." | |
212 | (interactive "FFind file: ") | |
213 | (switch-to-buffer (find-file-noselect filename))) | |
214 | ||
215 | (defun find-file-other-window (filename) | |
216 | "Edit file FILENAME, in another window. | |
217 | May create a new window, or reuse an existing one. | |
218 | See the function `display-buffer'." | |
219 | (interactive "FFind file in other window: ") | |
220 | (switch-to-buffer-other-window (find-file-noselect filename))) | |
221 | ||
222 | (defun find-file-read-only (filename) | |
223 | "Edit file FILENAME but don't allow changes. | |
224 | Like \\[find-file] but marks buffer as read-only. | |
225 | Use \\[toggle-read-only] to permit editing." | |
226 | (interactive "fFind file read-only: ") | |
227 | (find-file filename) | |
228 | (setq buffer-read-only t)) | |
229 | ||
230 | (defun find-file-read-only-other-window (filename) | |
231 | "Edit file FILENAME in another window but don't allow changes. | |
232 | Like \\[find-file-other-window] but marks buffer as read-only. | |
233 | Use \\[toggle-read-only] to permit editing." | |
234 | (interactive "fFind file read-only other window: ") | |
235 | (find-file filename) | |
236 | (setq buffer-read-only t)) | |
237 | ||
238 | (defun find-alternate-file (filename) | |
239 | "Find file FILENAME, select its buffer, kill previous buffer. | |
240 | If the current buffer now contains an empty file that you just visited | |
241 | \(presumably by mistake), use this command to visit the file you really want." | |
242 | (interactive | |
243 | (let ((file buffer-file-name) | |
244 | (file-name nil) | |
245 | (file-dir nil)) | |
246 | (and file | |
247 | (setq file-name (file-name-nondirectory file) | |
248 | file-dir (file-name-directory file))) | |
249 | (list (read-file-name "Find alternate file: " file-dir nil nil file-name)))) | |
250 | (and (buffer-modified-p) | |
251 | ;; (not buffer-read-only) | |
252 | (not (yes-or-no-p (format "Buffer %s is modified; kill anyway? " | |
253 | (buffer-name)))) | |
254 | (error "Aborted")) | |
255 | (let ((obuf (current-buffer)) | |
256 | (ofile buffer-file-name) | |
257 | (oname (buffer-name))) | |
258 | (rename-buffer " **lose**") | |
259 | (setq buffer-file-name nil) | |
260 | (unwind-protect | |
261 | (progn | |
262 | (unlock-buffer) | |
263 | (find-file filename)) | |
264 | (cond ((eq obuf (current-buffer)) | |
265 | (setq buffer-file-name ofile) | |
266 | (lock-buffer) | |
267 | (rename-buffer oname)))) | |
268 | (or (eq (current-buffer) obuf) | |
269 | (kill-buffer obuf)))) | |
270 | ||
271 | (defun create-file-buffer (filename) | |
272 | "Create a suitably named buffer for visiting FILENAME, and return it. | |
273 | FILENAME (sans directory) is used unchanged if that name is free; | |
274 | otherwise a string <2> or <3> or ... is appended to get an unused name." | |
275 | (let ((lastname (file-name-nondirectory filename))) | |
276 | (if (string= lastname "") | |
277 | (setq lastname filename)) | |
278 | (generate-new-buffer lastname))) | |
279 | ||
280 | (defun find-file-noselect (filename &optional nowarn) | |
281 | "Read file FILENAME into a buffer and return the buffer. | |
282 | If a buffer exists visiting FILENAME, return that one, but | |
283 | verify that the file has not changed since visited or saved. | |
284 | The buffer is not selected, just returned to the caller." | |
285 | (setq filename (expand-file-name filename)) | |
286 | ;; Get rid of the prefixes added by the automounter. | |
287 | (if (and (string-match "^/tmp_mnt/" filename) | |
288 | (file-exists-p (file-name-directory | |
289 | (substring filename (1- (match-end 0)))))) | |
290 | (setq filename (substring filename (1- (match-end 0))))) | |
291 | ;; Perform any appropriate abbreviations specified in directory-abbrev-alist. | |
292 | (let ((tail directory-abbrev-alist)) | |
293 | (while tail | |
294 | (if (string-match (car (car tail)) filename) | |
295 | (setq filename | |
296 | (concat (cdr (car tail)) (substring filename (match-end 0))))) | |
297 | (setq tail (cdr tail)))) | |
298 | (if (file-directory-p filename) | |
299 | (if find-file-run-dired | |
300 | (dired-noselect filename) | |
301 | (error "%s is a directory." filename)) | |
302 | (let ((buf (get-file-buffer filename)) | |
303 | error) | |
304 | (if buf | |
305 | (or nowarn | |
306 | (verify-visited-file-modtime buf) | |
307 | (cond ((not (file-exists-p filename)) | |
308 | (error "File %s no longer exists!" filename)) | |
309 | ((yes-or-no-p | |
310 | (format | |
311 | (if (buffer-modified-p buf) | |
312 | "File %s changed on disk. Discard your edits? " | |
313 | "File %s changed on disk. Read the new version? ") | |
314 | (file-name-nondirectory filename))) | |
315 | (save-excursion | |
316 | (set-buffer buf) | |
317 | (revert-buffer t t))))) | |
318 | (save-excursion | |
319 | (let* ((link-name (car (file-attributes filename))) | |
320 | (linked-buf (and (stringp link-name) | |
321 | (get-file-buffer link-name)))) | |
322 | (if (bufferp linked-buf) | |
323 | (message "Symbolic link to file in buffer %s" | |
324 | (buffer-name linked-buf)))) | |
325 | (setq buf (create-file-buffer filename)) | |
326 | (set-buffer buf) | |
327 | (erase-buffer) | |
328 | (condition-case () | |
329 | (insert-file-contents filename t) | |
330 | (file-error | |
331 | (setq error t) | |
332 | ;; Run find-file-not-found-hooks until one returns non-nil. | |
333 | (let ((hooks find-file-not-found-hooks)) | |
334 | (while (and hooks | |
335 | (not (funcall (car hooks)))) | |
336 | (setq hooks (cdr hooks)))))) | |
337 | ;; Set buffer's default directory to that of the file. | |
338 | (setq default-directory (file-name-directory filename)) | |
339 | ;; Turn off backup files for certain file names. Since | |
340 | ;; this is a permanent local, the major mode won't eliminate it. | |
341 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
342 | (progn | |
343 | (make-local-variable 'backup-inhibited) | |
344 | (setq backup-inhibited t))) | |
345 | (after-find-file error (not nowarn)))) | |
346 | buf))) | |
347 | \f | |
348 | (defun after-find-file (&optional error warn) | |
349 | "Called after finding a file and by the default revert function. | |
350 | Sets buffer mode, parses local variables. | |
351 | Optional args ERROR and WARN: ERROR non-nil means there was an | |
352 | error in reading the file. WARN non-nil means warn if there | |
353 | exists an auto-save file more recent than the visited file. | |
354 | Finishes by calling the functions in `find-file-hooks'." | |
355 | (setq buffer-read-only (not (file-writable-p buffer-file-name))) | |
356 | (if noninteractive | |
357 | nil | |
358 | (let* (not-serious | |
359 | (msg | |
360 | (cond ((and error (file-attributes buffer-file-name)) | |
361 | (setq buffer-read-only t) | |
362 | "File exists, but is read-protected.") | |
363 | ((not buffer-read-only) | |
364 | (if (and warn | |
365 | (file-newer-than-file-p (make-auto-save-file-name) | |
366 | buffer-file-name)) | |
367 | "Auto save file is newer; consider M-x recover-file" | |
368 | (setq not-serious t) | |
369 | (if error "(New file)" nil))) | |
370 | ((not error) | |
371 | (setq not-serious t) | |
372 | "Note: file is write protected") | |
373 | ((file-attributes (directory-file-name default-directory)) | |
374 | "File not found and directory write-protected") | |
375 | (t | |
376 | "File not found and directory doesn't exist")))) | |
377 | (if msg | |
378 | (progn | |
379 | (message msg) | |
380 | (or not-serious (sit-for 1 nil t))))) | |
381 | (if auto-save-default | |
382 | (auto-save-mode t))) | |
383 | (normal-mode t) | |
384 | (mapcar 'funcall find-file-hooks)) | |
385 | ||
386 | (defun normal-mode (&optional find-file) | |
387 | "Choose the major mode for this buffer automatically. | |
388 | Also sets up any specified local variables of the file. | |
389 | Uses the visited file name, the -*- line, and the local variables spec. | |
390 | ||
391 | This function is called automatically from `find-file'. In that case, | |
392 | we may set up specified local variables depending on the value of | |
393 | `enable-local-variables': if it is t, we do; if it is nil, we don't; | |
394 | otherwise, we query. `enable-local-variables' is ignored if you | |
395 | run `normal-mode' explicitly." | |
396 | (interactive) | |
397 | (or find-file (funcall (or default-major-mode 'fundamental-mode))) | |
398 | (condition-case err | |
399 | (set-auto-mode) | |
400 | (error (message "File mode specification error: %s" | |
401 | (prin1-to-string err)))) | |
402 | (condition-case err | |
403 | (hack-local-variables (not find-file)) | |
404 | (error (message "File local-variables error: %s" | |
405 | (prin1-to-string err))))) | |
406 | ||
407 | ;(defvar auto-mode-alist ...) now in loaddefs.el | |
408 | (defun set-auto-mode () | |
409 | "Select major mode appropriate for current buffer. | |
410 | May base decision on visited file name (see variable `auto-mode-alist') | |
411 | or on buffer contents (-*- line or local variables spec), but does not look | |
412 | for the \"mode:\" local variable. For that, use `hack-local-variables'." | |
413 | ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*- | |
414 | (let (beg end mode) | |
415 | (save-excursion | |
416 | (goto-char (point-min)) | |
417 | (skip-chars-forward " \t\n") | |
418 | (if (and (search-forward "-*-" (save-excursion (end-of-line) (point)) t) | |
419 | (progn | |
420 | (skip-chars-forward " \t") | |
421 | (setq beg (point)) | |
422 | (search-forward "-*-" (save-excursion (end-of-line) (point)) t)) | |
423 | (progn | |
424 | (forward-char -3) | |
425 | (skip-chars-backward " \t") | |
426 | (setq end (point)) | |
427 | (goto-char beg) | |
428 | (if (search-forward ":" end t) | |
429 | (progn | |
430 | (goto-char beg) | |
431 | (if (let ((case-fold-search t)) | |
432 | (search-forward "mode:" end t)) | |
433 | (progn | |
434 | (skip-chars-forward " \t") | |
435 | (setq beg (point)) | |
436 | (if (search-forward ";" end t) | |
437 | (forward-char -1) | |
438 | (goto-char end)) | |
439 | (skip-chars-backward " \t") | |
440 | (setq mode (buffer-substring beg (point)))))) | |
441 | (setq mode (buffer-substring beg end))))) | |
442 | (setq mode (intern (concat (downcase mode) "-mode"))) | |
443 | (let ((alist auto-mode-alist) | |
444 | (name buffer-file-name)) | |
445 | (let ((case-fold-search (eq system-type 'vax-vms))) | |
446 | ;; Remove backup-suffixes from file name. | |
447 | (setq name (file-name-sans-versions name)) | |
448 | ;; Find first matching alist entry. | |
449 | (while (and (not mode) alist) | |
450 | (if (string-match (car (car alist)) name) | |
451 | (setq mode (cdr (car alist)))) | |
452 | (setq alist (cdr alist))))))) | |
453 | (if mode (funcall mode)))) | |
454 | ||
455 | (defun hack-local-variables (&optional force) | |
456 | "Parse (and bind or evaluate as appropriate) any local variables | |
457 | for current buffer." | |
458 | ;; Look for "Local variables:" line in last page. | |
459 | (save-excursion | |
460 | (goto-char (point-max)) | |
461 | (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move) | |
462 | (if (let ((case-fold-search t)) | |
463 | (and (search-forward "Local Variables:" nil t) | |
464 | (or force (eq enable-local-variables t) | |
465 | (and enable-local-variables | |
466 | (save-window-excursion | |
467 | (switch-to-buffer (current-buffer)) | |
468 | (save-excursion | |
469 | (beginning-of-line) | |
470 | (set-window-start (selected-window) (point))) | |
471 | (y-or-n-p (format "Set local variables as specified at end of %s? " | |
472 | (file-name-nondirectory buffer-file-name)))))))) | |
473 | (let ((continue t) | |
474 | prefix prefixlen suffix beg) | |
475 | ;; The prefix is what comes before "local variables:" in its line. | |
476 | ;; The suffix is what comes after "local variables:" in its line. | |
477 | (skip-chars-forward " \t") | |
478 | (or (eolp) | |
479 | (setq suffix (buffer-substring (point) | |
480 | (progn (end-of-line) (point))))) | |
481 | (goto-char (match-beginning 0)) | |
482 | (or (bolp) | |
483 | (setq prefix | |
484 | (buffer-substring (point) | |
485 | (progn (beginning-of-line) (point))))) | |
486 | (if prefix (setq prefixlen (length prefix) | |
487 | prefix (regexp-quote prefix))) | |
488 | (if suffix (setq suffix (concat (regexp-quote suffix) "$"))) | |
489 | (while continue | |
490 | ;; Look at next local variable spec. | |
491 | (if selective-display (re-search-forward "[\n\C-m]") | |
492 | (forward-line 1)) | |
493 | ;; Skip the prefix, if any. | |
494 | (if prefix | |
495 | (if (looking-at prefix) | |
496 | (forward-char prefixlen) | |
497 | (error "Local variables entry is missing the prefix"))) | |
498 | ;; Find the variable name; strip whitespace. | |
499 | (skip-chars-forward " \t") | |
500 | (setq beg (point)) | |
501 | (skip-chars-forward "^:\n") | |
502 | (if (eolp) (error "Missing colon in local variables entry")) | |
503 | (skip-chars-backward " \t") | |
504 | (let* ((str (buffer-substring beg (point))) | |
505 | (var (read str)) | |
506 | val) | |
507 | ;; Setting variable named "end" means end of list. | |
508 | (if (string-equal (downcase str) "end") | |
509 | (setq continue nil) | |
510 | ;; Otherwise read the variable value. | |
511 | (skip-chars-forward "^:") | |
512 | (forward-char 1) | |
513 | (setq val (read (current-buffer))) | |
514 | (skip-chars-backward "\n") | |
515 | (skip-chars-forward " \t") | |
516 | (or (if suffix (looking-at suffix) (eolp)) | |
517 | (error "Local variables entry is terminated incorrectly")) | |
518 | ;; Set the variable. "Variables" mode and eval are funny. | |
519 | (cond ((eq var 'mode) | |
520 | (funcall (intern (concat (downcase (symbol-name val)) | |
521 | "-mode")))) | |
522 | ((eq var 'eval) | |
523 | (if (or (and ignore-local-eval (not force)) | |
524 | (string= (user-login-name) "root")) | |
525 | (message "Ignoring `eval:' in file's local variables") | |
526 | (save-excursion (eval val)))) | |
527 | (t (make-local-variable var) | |
528 | (set var val)))))))))) | |
529 | \f | |
530 | (defun set-visited-file-name (filename) | |
531 | "Change name of file visited in current buffer to FILENAME. | |
532 | The next time the buffer is saved it will go in the newly specified file. | |
533 | nil or empty string as argument means make buffer not be visiting any file. | |
534 | Remember to delete the initial contents of the minibuffer | |
535 | if you wish to pass an empty string as the argument." | |
536 | (interactive "FSet visited file name: ") | |
537 | (if filename | |
538 | (setq filename | |
539 | (if (string-equal filename "") | |
540 | nil | |
541 | (expand-file-name filename)))) | |
542 | (or (equal filename buffer-file-name) | |
543 | (null filename) | |
544 | (progn | |
545 | (lock-buffer filename) | |
546 | (unlock-buffer))) | |
547 | (setq buffer-file-name filename) | |
548 | (if filename ; make buffer name reflect filename. | |
549 | (let ((new-name (file-name-nondirectory buffer-file-name)) | |
550 | (old-name (buffer-name (current-buffer)))) | |
551 | (if (string= new-name "") | |
552 | (error "Empty file name")) | |
553 | (if (eq system-type 'vax-vms) | |
554 | (setq new-name (downcase new-name))) | |
555 | (setq default-directory (file-name-directory buffer-file-name)) | |
556 | (and (get-buffer new-name) | |
557 | (setq new-name | |
558 | (buffer-name (create-file-buffer buffer-file-name))) | |
559 | (kill-buffer new-name)) | |
560 | (rename-buffer new-name) | |
561 | (if (string= (prog1 (setq new-name (buffer-name (create-file-buffer | |
562 | buffer-file-name))) | |
563 | (kill-buffer new-name)) | |
564 | old-name) | |
565 | (rename-buffer old-name)))) | |
566 | (setq buffer-backed-up nil) | |
567 | (clear-visited-file-modtime) | |
568 | ;; write-file-hooks is normally used for things like ftp-find-file | |
569 | ;; that visit things that are not local files as if they were files. | |
570 | ;; Changing to visit an ordinary local file instead should flush the hook. | |
571 | (kill-local-variable 'write-file-hooks) | |
572 | (kill-local-variable 'revert-buffer-function) | |
573 | (kill-local-variable 'backup-inhibited) | |
574 | ;; Turn off backup files for certain file names. | |
575 | ;; Since this is a permanent local, the major mode won't eliminate it. | |
576 | (and (not (funcall backup-enable-predicate buffer-file-name)) | |
577 | (progn | |
578 | (make-local-variable 'backup-inhibited) | |
579 | (setq backup-inhibited t))) | |
580 | ;; If auto-save was not already on, turn it on if appropriate. | |
581 | (if (not buffer-auto-save-file-name) | |
582 | (auto-save-mode (and buffer-file-name auto-save-default))) | |
583 | (if buffer-file-name | |
584 | (set-buffer-modified-p t))) | |
585 | ||
586 | (defun write-file (filename) | |
587 | "Write current buffer into file FILENAME. | |
588 | Makes buffer visit that file, and marks it not modified." | |
589 | ;; (interactive "FWrite file: ") | |
590 | (interactive | |
591 | (list (if buffer-file-name | |
592 | (read-file-name "Write file: " | |
593 | nil nil nil nil) | |
594 | (read-file-name "Write file: " | |
595 | (cdr (assq 'default-directory | |
596 | (buffer-local-variables))) | |
597 | nil nil (buffer-name))))) | |
598 | (or (null filename) (string-equal filename "") | |
599 | (set-visited-file-name filename)) | |
600 | (set-buffer-modified-p t) | |
601 | (save-buffer)) | |
602 | \f | |
603 | (defun backup-buffer () | |
604 | "Make a backup of the disk file visited by the current buffer, if appropriate. | |
605 | This is normally done before saving the buffer the first time. | |
606 | If the value is non-nil, it is the result of `file-modes' on the original | |
607 | file; this means that the caller, after saving the buffer, should change | |
608 | the modes of the new file to agree with the old modes." | |
609 | (if (and make-backup-files (not backup-inhibited) | |
610 | (not buffer-backed-up) | |
611 | (file-exists-p buffer-file-name) | |
612 | (memq (aref (elt (file-attributes buffer-file-name) 8) 0) | |
613 | '(?- ?l))) | |
614 | (let ((real-file-name buffer-file-name) | |
615 | backup-info backupname targets setmodes) | |
616 | ;; If specified name is a symbolic link, chase it to the target. | |
617 | ;; Thus we make the backups in the directory where the real file is. | |
618 | (while (let ((tem (file-symlink-p real-file-name))) | |
619 | (if tem | |
620 | (setq real-file-name | |
621 | (expand-file-name tem | |
622 | (file-name-directory real-file-name)))) | |
623 | tem)) | |
624 | (setq backup-info (find-backup-file-name real-file-name) | |
625 | backupname (car backup-info) | |
626 | targets (cdr backup-info)) | |
627 | ;;; (if (file-directory-p buffer-file-name) | |
628 | ;;; (error "Cannot save buffer in directory %s" buffer-file-name)) | |
629 | (condition-case () | |
630 | (let ((delete-old-versions | |
631 | ;; If have old versions to maybe delete, | |
632 | ;; ask the user to confirm now, before doing anything. | |
633 | ;; But don't actually delete til later. | |
634 | (and targets | |
635 | (or trim-versions-without-asking | |
636 | (y-or-n-p (format "Delete excess backup versions of %s? " | |
637 | real-file-name)))))) | |
638 | ;; Actually write the back up file. | |
639 | (condition-case () | |
640 | (if (or file-precious-flag | |
641 | ; (file-symlink-p buffer-file-name) | |
642 | backup-by-copying | |
643 | (and backup-by-copying-when-linked | |
644 | (> (file-nlinks real-file-name) 1)) | |
645 | (and backup-by-copying-when-mismatch | |
646 | (let ((attr (file-attributes real-file-name))) | |
647 | (or (nth 9 attr) | |
648 | (/= (nth 2 attr) (user-uid)))))) | |
649 | (copy-file real-file-name backupname t t) | |
650 | ; rename-file should delete old backup. | |
651 | ; (condition-case () | |
652 | ; (delete-file backupname) | |
653 | ; (file-error nil)) | |
654 | (rename-file real-file-name backupname t) | |
655 | (setq setmodes (file-modes backupname))) | |
656 | (file-error | |
657 | ;; If trouble writing the backup, write it in ~. | |
658 | (setq backupname (expand-file-name "~/%backup%~")) | |
659 | (message "Cannot write backup file; backing up in ~/%%backup%%~") | |
660 | (sleep-for 1) | |
661 | (copy-file real-file-name backupname t t))) | |
662 | (setq buffer-backed-up t) | |
663 | ;; Now delete the old versions, if desired. | |
664 | (if delete-old-versions | |
665 | (while targets | |
666 | (condition-case () | |
667 | (delete-file (car targets)) | |
668 | (file-error nil)) | |
669 | (setq targets (cdr targets)))) | |
670 | setmodes) | |
671 | (file-error nil))))) | |
672 | ||
673 | (defun file-name-sans-versions (name) | |
674 | "Return FILENAME sans backup versions or strings. | |
675 | This is a separate procedure so your site-init or startup file can | |
676 | redefine it." | |
677 | (substring name 0 | |
678 | (if (eq system-type 'vax-vms) | |
679 | ;; VMS version number is (a) semicolon, optional | |
680 | ;; sign, zero or more digits or (b) period, option | |
681 | ;; sign, zero or more digits, provided this is the | |
682 | ;; second period encountered outside of the | |
683 | ;; device/directory part of the file name. | |
684 | (or (string-match ";[---+]?[0-9]*\\'" name) | |
685 | (if (string-match "\\.[^]>:]*\\(\\.[---+]?[0-9]*\\)\\'" | |
686 | name) | |
687 | (match-beginning 1)) | |
688 | (length name)) | |
689 | (or (string-match "\\.~[0-9]+~\\'" name) | |
690 | (string-match "~\\'" name) | |
691 | (length name))))) | |
692 | ||
693 | (defun make-backup-file-name (file) | |
694 | "Create the non-numeric backup file name for FILE. | |
695 | This is a separate function so you can redefine it for customization." | |
696 | (concat file "~")) | |
697 | ||
698 | (defun backup-file-name-p (file) | |
699 | "Return non-nil if FILE is a backup file name (numeric or not). | |
700 | This is a separate function so you can redefine it for customization. | |
701 | You may need to redefine `file-name-sans-versions' as well." | |
702 | (string-match "~$" file)) | |
703 | ||
704 | ;; I believe there is no need to alter this behavior for VMS; | |
705 | ;; since backup files are not made on VMS, it should not get called. | |
706 | (defun find-backup-file-name (fn) | |
707 | "Find a file name for a backup file, and suggestions for deletions. | |
708 | Value is a list whose car is the name for the backup file | |
709 | and whose cdr is a list of old versions to consider deleting now." | |
710 | (if (eq version-control 'never) | |
711 | (list (make-backup-file-name fn)) | |
712 | (let* ((base-versions (concat (file-name-nondirectory fn) ".~")) | |
713 | (bv-length (length base-versions)) | |
714 | (possibilities (file-name-all-completions | |
715 | base-versions | |
716 | (file-name-directory fn))) | |
717 | (versions (sort (mapcar 'backup-extract-version possibilities) | |
718 | '<)) | |
719 | (high-water-mark (apply 'max (cons 0 versions))) | |
720 | (deserve-versions-p | |
721 | (or version-control | |
722 | (> high-water-mark 0))) | |
723 | (number-to-delete (- (length versions) | |
724 | kept-old-versions kept-new-versions -1))) | |
725 | (if (not deserve-versions-p) | |
726 | (list (make-backup-file-name fn)) | |
727 | (cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~") | |
728 | (if (> number-to-delete 0) | |
729 | (mapcar (function (lambda (n) | |
730 | (concat fn ".~" (int-to-string n) "~"))) | |
731 | (let ((v (nthcdr kept-old-versions versions))) | |
732 | (rplacd (nthcdr (1- number-to-delete) v) ()) | |
733 | v)))))))) | |
734 | ||
735 | (defun backup-extract-version (fn) | |
736 | (if (and (string-match "[0-9]+~$" fn bv-length) | |
737 | (= (match-beginning 0) bv-length)) | |
738 | (string-to-int (substring fn bv-length -1)) | |
739 | 0)) | |
740 | ||
741 | (defun file-nlinks (filename) | |
742 | "Return number of names file FILENAME has." | |
743 | (car (cdr (file-attributes filename)))) | |
744 | \f | |
745 | (defun save-buffer (&optional args) | |
746 | "Save current buffer in visited file if modified. Versions described below. | |
747 | By default, makes the previous version into a backup file | |
748 | if previously requested or if this is the first save. | |
749 | With 1 or 3 \\[universal-argument]'s, marks this version | |
750 | to become a backup when the next save is done. | |
751 | With 2 or 3 \\[universal-argument]'s, | |
752 | unconditionally makes the previous version into a backup file. | |
753 | With argument of 0, never makes the previous version into a backup file. | |
754 | ||
755 | If a file's name is FOO, the names of its numbered backup versions are | |
756 | FOO.~i~ for various integers i. A non-numbered backup file is called FOO~. | |
757 | Numeric backups (rather than FOO~) will be made if value of | |
758 | `version-control' is not the atom `never' and either there are already | |
759 | numeric versions of the file being backed up, or `version-control' is | |
760 | non-nil. | |
761 | We don't want excessive versions piling up, so there are variables | |
762 | `kept-old-versions', which tells Emacs how many oldest versions to keep, | |
763 | and `kept-new-versions', which tells how many newest versions to keep. | |
764 | Defaults are 2 old versions and 2 new. | |
765 | `dired-kept-versions' controls dired's clean-directory (.) command. | |
766 | If `trim-versions-without-asking' is nil, system will query user | |
767 | before trimming versions. Otherwise it does it silently." | |
768 | (interactive "p") | |
769 | (let ((modp (buffer-modified-p)) | |
770 | (large (> (buffer-size) 50000)) | |
771 | (make-backup-files (and make-backup-files (not (eq args 0))))) | |
772 | (and modp (memq args '(16 64)) (setq buffer-backed-up nil)) | |
773 | (if (and modp large) (message "Saving file %s..." (buffer-file-name))) | |
774 | (basic-save-buffer) | |
775 | (and modp (memq args '(4 64)) (setq buffer-backed-up nil)))) | |
776 | ||
777 | (defun delete-auto-save-file-if-necessary (&optional force) | |
778 | "Delete auto-save file for current buffer if `delete-auto-save-files' is t. | |
779 | Normally delete only if the file was written by this Emacs since | |
780 | the last real save, but optional arg FORCE non-nil means delete anyway." | |
781 | (and buffer-auto-save-file-name delete-auto-save-files | |
782 | (not (string= buffer-file-name buffer-auto-save-file-name)) | |
783 | (or force (recent-auto-save-p)) | |
784 | (progn | |
785 | (condition-case () | |
786 | (delete-file buffer-auto-save-file-name) | |
787 | (file-error nil)) | |
788 | (set-buffer-auto-saved)))) | |
789 | ||
790 | (defun basic-save-buffer () | |
791 | "Save the current buffer in its visited file, if it has been modified." | |
792 | (interactive) | |
793 | (if (buffer-modified-p) | |
794 | (let ((recent-save (recent-auto-save-p)) | |
795 | setmodes tempsetmodes) | |
796 | ;; On VMS, rename file and buffer to get rid of version number. | |
797 | (if (and (eq system-type 'vax-vms) | |
798 | (not (string= buffer-file-name | |
799 | (file-name-sans-versions buffer-file-name)))) | |
800 | (let (buffer-new-name) | |
801 | ;; Strip VMS version number before save. | |
802 | (setq buffer-file-name | |
803 | (file-name-sans-versions buffer-file-name)) | |
804 | ;; Construct a (unique) buffer name to correspond. | |
805 | (let ((buf (create-file-buffer (downcase buffer-file-name)))) | |
806 | (setq buffer-new-name (buffer-name buf)) | |
807 | (kill-buffer buf)) | |
808 | (rename-buffer buffer-new-name))) | |
809 | ;; If buffer has no file name, ask user for one. | |
810 | (or buffer-file-name | |
811 | (progn | |
812 | (setq buffer-file-name | |
813 | (expand-file-name (read-file-name "File to save in: ") nil) | |
814 | default-directory (file-name-directory buffer-file-name)) | |
815 | (auto-save-mode auto-save-default))) | |
816 | (or (verify-visited-file-modtime (current-buffer)) | |
817 | (not (file-exists-p buffer-file-name)) | |
818 | (yes-or-no-p | |
819 | (format "%s has changed since visited or saved. Save anyway? " | |
820 | (file-name-nondirectory buffer-file-name))) | |
821 | (error "Save not confirmed")) | |
822 | (save-restriction | |
823 | (widen) | |
824 | (and (> (point-max) 1) | |
825 | (/= (char-after (1- (point-max))) ?\n) | |
826 | (or (eq require-final-newline t) | |
827 | (and require-final-newline | |
828 | (y-or-n-p | |
829 | (format "Buffer %s does not end in newline. Add one? " | |
830 | (buffer-name))))) | |
831 | (save-excursion | |
832 | (goto-char (point-max)) | |
833 | (insert ?\n))) | |
834 | (let ((hooks write-file-hooks) | |
835 | (done nil)) | |
836 | (while (and hooks | |
837 | (not (setq done (funcall (car hooks))))) | |
838 | (setq hooks (cdr hooks))) | |
839 | ;; If a hook returned t, file is already "written". | |
840 | (cond ((not done) | |
841 | (if (not (file-writable-p buffer-file-name)) | |
842 | (let ((dir (file-name-directory buffer-file-name))) | |
843 | (if (not (file-directory-p dir)) | |
844 | (error "%s is not a directory" dir) | |
845 | (if (not (file-exists-p buffer-file-name)) | |
846 | (error "Directory %s write-protected" dir) | |
847 | (if (yes-or-no-p | |
848 | (format "File %s is write-protected; try to save anyway? " | |
849 | (file-name-nondirectory | |
850 | buffer-file-name))) | |
851 | (setq tempsetmodes t) | |
852 | (error "Attempt to save to a file which you aren't allowed to write")))))) | |
853 | (or buffer-backed-up | |
854 | (setq setmodes (backup-buffer))) | |
855 | (if file-precious-flag | |
856 | ;; If file is precious, rename it away before | |
857 | ;; overwriting it. | |
858 | (let ((rename t) | |
859 | realname tempname temp) | |
860 | ;; Chase symlinks; rename the ultimate actual file. | |
861 | (setq realname buffer-file-name) | |
862 | (while (setq temp (file-symlink-p realname)) | |
863 | (setq realname temp)) | |
864 | (setq tempname (concat realname "#")) | |
865 | (condition-case () | |
866 | (progn (rename-file realname tempname t) | |
867 | (setq setmodes (file-modes tempname))) | |
868 | (file-error (setq rename nil tempname nil))) | |
869 | (if (file-directory-p realname) | |
870 | (error "%s is a directory" realname)) | |
871 | (unwind-protect | |
872 | (progn (clear-visited-file-modtime) | |
873 | (write-region (point-min) (point-max) | |
874 | realname nil t) | |
875 | (setq rename nil)) | |
876 | ;; If rename is still t, writing failed. | |
877 | ;; So rename the old file back to original name, | |
878 | (if rename | |
879 | (progn | |
880 | (rename-file tempname realname t) | |
881 | (clear-visited-file-modtime)) | |
882 | ;; Otherwise we don't need the original file, | |
883 | ;; so flush it, if we still have it. | |
884 | ;; If rename failed due to name length restriction | |
885 | ;; then TEMPNAME is now nil. | |
886 | (if tempname | |
887 | (condition-case () | |
888 | (delete-file tempname) | |
889 | (error nil)))))) | |
890 | ;; If file not writable, see if we can make it writable | |
891 | ;; temporarily while we write it. | |
892 | ;; But no need to do so if we have just backed it up | |
893 | ;; (setmodes is set) because that says we're superseding. | |
894 | (cond ((and tempsetmodes (not setmodes)) | |
895 | ;; Change the mode back, after writing. | |
896 | (setq setmodes (file-modes buffer-file-name)) | |
897 | (set-file-modes buffer-file-name 511))) | |
898 | (write-region (point-min) (point-max) | |
899 | buffer-file-name nil t))))) | |
900 | (if setmodes | |
901 | (condition-case () | |
902 | (set-file-modes buffer-file-name setmodes) | |
903 | (error nil)))) | |
904 | ;; If the auto-save file was recent before this command, | |
905 | ;; delete it now. | |
906 | (delete-auto-save-file-if-necessary recent-save) | |
907 | (run-hooks 'after-save-hooks)) | |
908 | (message "(No changes need to be saved)"))) | |
909 | ||
910 | ||
911 | (require 'map-ynp) | |
912 | ||
913 | (defun save-some-buffers (&optional arg exiting) | |
914 | "Save some modified file-visiting buffers. Asks user about each one. | |
915 | With argument, saves all with no questions." | |
916 | (interactive "P") | |
917 | (if (zerop (map-y-or-n-p | |
918 | (function | |
919 | (lambda (buffer) | |
920 | (and (buffer-modified-p buffer) | |
921 | (or | |
922 | (buffer-file-name buffer) | |
923 | (and exiting | |
924 | (save-excursion | |
925 | (set-buffer buffer) | |
926 | buffer-offer-save (> (buffer-size) 0)))) | |
927 | (if arg | |
928 | t | |
929 | (if (buffer-file-name buffer) | |
930 | (format "Save file %s? " | |
931 | (buffer-file-name buffer)) | |
932 | (format "Save buffer %s? " | |
933 | (buffer-name buffer))))))) | |
934 | (function | |
935 | (lambda (buffer) | |
936 | (save-excursion | |
937 | (set-buffer buffer) | |
938 | (save-buffer)))) | |
939 | (buffer-list) | |
940 | '("buffer" "buffers" "save"))) | |
941 | (message "(No files need saving)"))) | |
942 | \f | |
943 | (defun not-modified (&optional arg) | |
944 | "Mark current buffer as unmodified, not needing to be saved. | |
945 | With prefix arg, mark buffer as modified, so \\[save-buffer] will save." | |
946 | (interactive "P") | |
947 | (message (if arg "Modification-flag set" | |
948 | "Modification-flag cleared")) | |
949 | (set-buffer-modified-p arg)) | |
950 | ||
951 | (defun toggle-read-only (&optional arg) | |
952 | "Change whether this buffer is visiting its file read-only. | |
953 | With arg, set read-only iff arg is positive." | |
954 | (interactive "P") | |
955 | (setq buffer-read-only | |
956 | (if (null arg) | |
957 | (not buffer-read-only) | |
958 | (> (prefix-numeric-value arg) 0))) | |
959 | ;; Force mode-line redisplay | |
960 | (set-buffer-modified-p (buffer-modified-p))) | |
961 | ||
962 | (defun insert-file (filename) | |
963 | "Insert contents of file FILENAME into buffer after point. | |
964 | Set mark after the inserted text. | |
965 | ||
966 | This function is meant for the user to run interactively. | |
967 | Don't call it from programs! Use `insert-file-contents' instead. | |
968 | \(Its calling sequence is different; see its documentation)." | |
969 | (interactive "fInsert file: ") | |
970 | (let ((tem (insert-file-contents filename))) | |
971 | (push-mark (+ (point) (car (cdr tem)))))) | |
972 | ||
973 | (defun append-to-file (start end filename) | |
974 | "Append the contents of the region to the end of file FILENAME. | |
975 | When called from a function, expects three arguments, | |
976 | START, END and FILENAME. START and END are buffer positions | |
977 | saying what text to write." | |
978 | (interactive "r\nFAppend to file: ") | |
979 | (write-region start end filename t)) | |
980 | ||
981 | (defun file-newest-backup (filename) | |
982 | "Return most recent backup file for FILENAME or nil if no backups exist." | |
983 | (let* ((filename (expand-file-name filename)) | |
984 | (file (file-name-nondirectory filename)) | |
985 | (dir (file-name-directory filename)) | |
986 | (comp (file-name-all-completions file dir)) | |
987 | newest) | |
988 | (while comp | |
989 | (setq file (concat dir (car comp)) | |
990 | comp (cdr comp)) | |
991 | (if (and (backup-file-name-p file) | |
992 | (or (null newest) (file-newer-than-file-p file newest))) | |
993 | (setq newest file))) | |
994 | newest)) | |
995 | ||
996 | (defun rename-uniquely () | |
997 | "Rename current buffer to a similar name not already taken. | |
998 | This function is useful for creating multiple shell process buffers | |
999 | or multiple mail buffers, etc." | |
1000 | (interactive) | |
1001 | (let* ((new-buf (generate-new-buffer (buffer-name))) | |
1002 | (name (buffer-name new-buf))) | |
1003 | (kill-buffer new-buf) | |
1004 | (rename-buffer name) | |
1005 | (set-buffer-modified-p (buffer-modified-p)))) ; force mode line update | |
1006 | \f | |
1007 | (put 'revert-buffer-function 'permanent-local t) | |
1008 | (defvar revert-buffer-function nil | |
1009 | "Function to use to revert this buffer, or nil to do the default.") | |
1010 | ||
1011 | (put 'revert-buffer-insert-file-contents-function 'permanent-local t) | |
1012 | (defvar revert-buffer-insert-file-contents-function nil | |
1013 | "Function to use to insert contents when reverting this buffer. | |
1014 | Gets two args, first the nominal file name to use, | |
1015 | and second, t if reading the auto-save file.") | |
1016 | ||
1017 | (defun revert-buffer (&optional arg noconfirm) | |
1018 | "Replace the buffer text with the text of the visited file on disk. | |
1019 | This undoes all changes since the file was visited or saved. | |
1020 | If latest auto-save file is more recent than the visited file, | |
1021 | asks user whether to use that instead. | |
1022 | ||
1023 | Optional first argument ARG means don't offer to use auto-save file. | |
1024 | This is the prefix arg when called interactively. | |
1025 | Optional second argument NOCONFIRM means don't ask for confirmation at all. | |
1026 | ||
1027 | If `revert-buffer-function' value is non-nil, it is called to do the work." | |
1028 | (interactive "P") | |
1029 | (if revert-buffer-function | |
1030 | (funcall revert-buffer-function arg noconfirm) | |
1031 | (let* ((opoint (point)) | |
1032 | (auto-save-p (and (null arg) (recent-auto-save-p) | |
1033 | buffer-auto-save-file-name | |
1034 | (file-readable-p buffer-auto-save-file-name) | |
1035 | (y-or-n-p | |
1036 | "Buffer has been auto-saved recently. Revert from auto-save file? "))) | |
1037 | (file-name (if auto-save-p | |
1038 | buffer-auto-save-file-name | |
1039 | buffer-file-name))) | |
1040 | (cond ((null file-name) | |
1041 | (error "Buffer does not seem to be associated with any file")) | |
1042 | ((or noconfirm | |
1043 | (yes-or-no-p (format "Revert buffer from file %s? " | |
1044 | file-name))) | |
1045 | ;; If file was backed up but has changed since, | |
1046 | ;; we shd make another backup. | |
1047 | (and (not auto-save-p) | |
1048 | (not (verify-visited-file-modtime)) | |
1049 | (setq buffer-backed-up nil)) | |
1050 | ;; Get rid of all undo records for this buffer. | |
1051 | (or (eq buffer-undo-list t) | |
1052 | (setq buffer-undo-list nil)) | |
1053 | (let ((buffer-read-only nil) | |
1054 | ;; Don't make undo records for the reversion. | |
1055 | (buffer-undo-list t)) | |
1056 | (if revert-buffer-insert-file-contents-function | |
1057 | (funcall revert-buffer-insert-file-contents-function | |
1058 | file-name auto-save-p) | |
1059 | (if (not (file-exists-p file-name)) | |
1060 | (error "File %s no longer exists!" file-name)) | |
1061 | ;; Bind buffer-file-name to nil | |
1062 | ;; so that we don't try to lock the file. | |
1063 | (let ((buffer-file-name nil)) | |
1064 | (or auto-save-p | |
1065 | (unlock-buffer)) | |
1066 | (erase-buffer)) | |
1067 | (insert-file-contents file-name (not auto-save-p)))) | |
1068 | (goto-char (min opoint (point-max))) | |
1069 | (after-find-file nil) | |
1070 | t))))) | |
1071 | ||
1072 | (defun recover-file (file) | |
1073 | "Visit file FILE, but get contents from its last auto-save file." | |
1074 | (interactive | |
1075 | (let ((prompt-file buffer-file-name) | |
1076 | (file-name nil) | |
1077 | (file-dir nil)) | |
1078 | (and prompt-file | |
1079 | (setq file-name (file-name-nondirectory prompt-file) | |
1080 | file-dir (file-name-directory prompt-file))) | |
1081 | (list (read-file-name "Recover file: " | |
1082 | file-dir nil nil file-name)))) | |
1083 | (setq file (expand-file-name file)) | |
1084 | (if (auto-save-file-name-p file) (error "%s is an auto-save file" file)) | |
1085 | (let ((file-name (let ((buffer-file-name file)) | |
1086 | (make-auto-save-file-name)))) | |
1087 | (cond ((not (file-newer-than-file-p file-name file)) | |
1088 | (error "Auto-save file %s not current" file-name)) | |
1089 | ((save-window-excursion | |
1090 | (if (not (eq system-type 'vax-vms)) | |
1091 | (with-output-to-temp-buffer "*Directory*" | |
1092 | (buffer-disable-undo standard-output) | |
1093 | (call-process "ls" nil standard-output nil | |
1094 | "-l" file file-name))) | |
1095 | (yes-or-no-p (format "Recover auto save file %s? " file-name))) | |
1096 | (switch-to-buffer (find-file-noselect file t)) | |
1097 | (let ((buffer-read-only nil)) | |
1098 | (erase-buffer) | |
1099 | (insert-file-contents file-name nil)) | |
1100 | (after-find-file nil)) | |
1101 | (t (error "Recover-file cancelled."))))) | |
1102 | ||
1103 | (defun kill-some-buffers () | |
1104 | "For each buffer, ask whether to kill it." | |
1105 | (interactive) | |
1106 | (let ((list (buffer-list))) | |
1107 | (while list | |
1108 | (let* ((buffer (car list)) | |
1109 | (name (buffer-name buffer))) | |
1110 | (and (not (string-equal name "")) | |
1111 | (/= (aref name 0) ? ) | |
1112 | (yes-or-no-p | |
1113 | (format "Buffer %s %s. Kill? " | |
1114 | name | |
1115 | (if (buffer-modified-p buffer) | |
1116 | "HAS BEEN EDITED" "is unmodified"))) | |
1117 | (kill-buffer buffer))) | |
1118 | (setq list (cdr list))))) | |
1119 | \f | |
1120 | (defun auto-save-mode (arg) | |
1121 | "Toggle auto-saving of contents of current buffer. | |
1122 | With ARG, turn auto-saving on if positive, else off." | |
1123 | (interactive "P") | |
1124 | (setq buffer-auto-save-file-name | |
1125 | (and (if (null arg) | |
1126 | (not buffer-auto-save-file-name) | |
1127 | (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0)))) | |
1128 | (if (and buffer-file-name auto-save-visited-file-name | |
1129 | (not buffer-read-only)) | |
1130 | buffer-file-name | |
1131 | (make-auto-save-file-name)))) | |
1132 | (if (interactive-p) | |
1133 | (message "Auto-save %s (in this buffer)" | |
1134 | (if buffer-auto-save-file-name "on" "off"))) | |
1135 | buffer-auto-save-file-name) | |
1136 | ||
1137 | (defun rename-auto-save-file () | |
1138 | "Adjust current buffer's auto save file name for current conditions. | |
1139 | Also rename any existing auto save file, if it was made in this session." | |
1140 | (let ((osave buffer-auto-save-file-name)) | |
1141 | (setq buffer-auto-save-file-name | |
1142 | (make-auto-save-file-name)) | |
1143 | (if (and osave buffer-auto-save-file-name | |
1144 | (not (string= buffer-auto-save-file-name buffer-file-name)) | |
1145 | (not (string= buffer-auto-save-file-name osave)) | |
1146 | (file-exists-p osave) | |
1147 | (recent-auto-save-p)) | |
1148 | (rename-file osave buffer-auto-save-file-name t)))) | |
1149 | ||
1150 | (defun make-auto-save-file-name () | |
1151 | "Return file name to use for auto-saves of current buffer. | |
1152 | Does not consider `auto-save-visited-file-name' as that variable is checked | |
1153 | before calling this function. You can redefine this for customization. | |
1154 | See also `auto-save-file-name-p'." | |
1155 | (if buffer-file-name | |
1156 | (concat (file-name-directory buffer-file-name) | |
1157 | "#" | |
1158 | (file-name-nondirectory buffer-file-name) | |
1159 | "#") | |
1160 | ;; For non-file bfr, use bfr name and Emacs pid. | |
1161 | (expand-file-name (format "#%s#%s#" (buffer-name) (make-temp-name ""))))) | |
1162 | ||
1163 | (defun auto-save-file-name-p (filename) | |
1164 | "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'. | |
1165 | FILENAME should lack slashes. You can redefine this for customization." | |
1166 | (string-match "^#.*#$" filename)) | |
1167 | \f | |
1168 | (defconst list-directory-brief-switches | |
1169 | (if (eq system-type 'vax-vms) "" "-CF") | |
1170 | "*Switches for list-directory to pass to `ls' for brief listing,") | |
1171 | ||
1172 | (defconst list-directory-verbose-switches | |
1173 | (if (eq system-type 'vax-vms) | |
1174 | "/PROTECTION/SIZE/DATE/OWNER/WIDTH=(OWNER:10)" | |
1175 | "-l") | |
1176 | "*Switches for list-directory to pass to `ls' for verbose listing,") | |
1177 | ||
1178 | (defun list-directory (dirname &optional verbose) | |
1179 | "Display a list of files in or matching DIRNAME, a la `ls'. | |
1180 | DIRNAME is globbed by the shell if necessary. | |
1181 | Prefix arg (second arg if noninteractive) means supply -l switch to `ls'. | |
1182 | Actions controlled by variables `list-directory-brief-switches' | |
1183 | and `list-directory-verbose-switches'." | |
1184 | (interactive (let ((pfx current-prefix-arg)) | |
1185 | (list (read-file-name (if pfx "List directory (verbose): " | |
1186 | "List directory (brief): ") | |
1187 | nil default-directory nil) | |
1188 | pfx))) | |
1189 | (let ((switches (if verbose list-directory-verbose-switches | |
1190 | list-directory-brief-switches))) | |
1191 | (or dirname (setq dirname default-directory)) | |
1192 | (setq dirname (expand-file-name dirname)) | |
1193 | (with-output-to-temp-buffer "*Directory*" | |
1194 | (buffer-disable-undo standard-output) | |
1195 | (princ "Directory ") | |
1196 | (princ dirname) | |
1197 | (terpri) | |
1198 | (if (eq system-type 'vax-vms) | |
1199 | (vms-read-directory dirname switches standard-output) | |
1200 | (if (file-directory-p dirname) | |
1201 | (save-excursion | |
1202 | (set-buffer "*Directory*") | |
1203 | (call-process "ls" nil standard-output nil switches | |
1204 | (setq default-directory | |
1205 | (file-name-as-directory dirname)))) | |
1206 | (let ((default-directory (file-name-directory dirname))) | |
1207 | (if (file-exists-p default-directory) | |
1208 | (call-process shell-file-name nil standard-output nil | |
1209 | "-c" (concat "exec ls " | |
1210 | switches " " | |
1211 | (file-name-nondirectory dirname))) | |
1212 | (princ "No such directory: ") | |
1213 | (princ dirname) | |
1214 | (terpri)))))))) | |
1215 | ||
1216 | (defun save-buffers-kill-emacs (&optional arg) | |
1217 | "Offer to save each buffer, then kill this Emacs process. | |
1218 | With prefix arg, silently save all file-visiting buffers, then kill." | |
1219 | (interactive "P") | |
1220 | (save-some-buffers arg t) | |
1221 | (and (or (not (memq t (mapcar (function | |
1222 | (lambda (buf) (and (buffer-file-name buf) | |
1223 | (buffer-modified-p buf)))) | |
1224 | (buffer-list)))) | |
1225 | (yes-or-no-p "Modified buffers exist; exit anyway? ")) | |
1226 | (or (not (fboundp 'process-list)) | |
1227 | ;; process-list is not defined on VMS. | |
1228 | (let ((processes (process-list)) | |
1229 | active) | |
1230 | (while processes | |
1231 | (and (memq (process-status (car processes)) '(run stop)) | |
1232 | (let ((val (process-kill-without-query (car processes)))) | |
1233 | (process-kill-without-query (car processes) val) | |
1234 | val) | |
1235 | (setq active t)) | |
1236 | (setq processes (cdr processes))) | |
1237 | (or (not active) | |
1238 | (yes-or-no-p "Active processes exist; kill them and exit anyway? ")))) | |
1239 | (kill-emacs))) | |
1240 | \f | |
1241 | (define-key ctl-x-map "\C-f" 'find-file) | |
1242 | (define-key ctl-x-map "\C-q" 'toggle-read-only) | |
1243 | (define-key ctl-x-map "\C-r" 'find-file-read-only) | |
1244 | (define-key ctl-x-map "\C-v" 'find-alternate-file) | |
1245 | (define-key ctl-x-map "\C-s" 'save-buffer) | |
1246 | (define-key ctl-x-map "s" 'save-some-buffers) | |
1247 | (define-key ctl-x-map "\C-w" 'write-file) | |
1248 | (define-key ctl-x-map "i" 'insert-file) | |
1249 | (define-key esc-map "~" 'not-modified) | |
1250 | (define-key ctl-x-map "\C-d" 'list-directory) | |
1251 | (define-key ctl-x-map "\C-c" 'save-buffers-kill-emacs) | |
1252 | ||
1253 | (define-key ctl-x-4-map "f" 'find-file-other-window) | |
1254 | (define-key ctl-x-4-map "r" 'find-file-read-only-other-window) | |
1255 | (define-key ctl-x-4-map "\C-f" 'find-file-other-window) | |
1256 | (define-key ctl-x-4-map "b" 'switch-to-buffer-other-window) |