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1.1 root 1: ;; File input and output commands for Emacs
2: ;; Copyright (C) 1985, 1986, 1987, 1990 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:
21: (defconst delete-auto-save-files t
22: "*Non-nil means delete a buffer's auto-save file
23: when the buffer is saved for real.")
24:
25: ;(make-variable-buffer-local 'buffer-backed-up)
26: ;(defvar buffer-backed-up nil
27: ; "Non-nil if this buffer's file has been backed up.
28: ;Backing up is done before the first time the file is saved.")
29:
30: ;;; Turn off backup files on VMS since it has version numbers.
31: (defconst make-backup-files (not (eq system-type 'vax-vms))
32: "*Create a backup of each file when it is saved for the first time.
33: This can be done by renaming the file or by copying.
34:
35: Renaming means that Emacs renames the existing file so that it is a
36: backup file, then writes the buffer into a new file. Any other names
37: that the old file had will now refer to the backup file.
38: The new file is owned by you and its group is defaulted.
39:
40: Copying means that Emacs copies the existing file into the backup file,
41: then writes the buffer on top of the existing file. Any other names
42: that the old file had will now refer to the new (edited) file.
43: The file's owner and group are unchanged.
44:
45: The choice of renaming or copying is controlled by the variables
46: backup-by-copying, backup-by-copying-when-linked and
47: backup-by-copying-when-mismatch.")
48:
49: (defconst backup-by-copying nil
50: "*Non-nil means always use copying to create backup files.
51: See documentation of variable make-backup-files.")
52:
53: (defconst backup-by-copying-when-linked nil
54: "*Non-nil means use copying to create backups for files with multiple names.
55: This causes the alternate names to refer to the latest version as edited.
56: This variable is relevant only if backup-by-copying is nil.")
57:
58: (defconst backup-by-copying-when-mismatch nil
59: "*Non-nil means create backups by copying if this preserves owner or group.
60: Renaming may still be used (subject to control of other variables)
61: when it would not result in changing the owner or group of the file;
62: that is, for files which are owned by you and whose group matches
63: the default for a new file created there by you.
64: This variable is relevant only if backup-by-copying is nil.")
65:
66: (defconst buffer-offer-save nil
67: "*Non-nil in a buffer means offer to save the buffer on exit
68: even if the buffer is not visiting a file. Automatically local in
69: all buffers.")
70: (make-variable-buffer-local 'buffer-offer-save)
71:
72: (defconst file-precious-flag nil
73: "*Non-nil means protect against I/O errors while saving files.
74: Some modes set this non-nil in particular buffers.")
75:
76: (defvar version-control nil
77: "*Control use of version numbers for backup files.
78: t means make numeric backup versions unconditionally.
79: nil means make them for files that have some already.
80: never means do not make them.")
81:
82: (defvar dired-kept-versions 2
83: "*When cleaning directory, number of versions to keep.")
84:
85: (defvar trim-versions-without-asking nil
86: "*If true, deletes excess backup versions silently.
87: Otherwise asks confirmation.")
88:
89: (defvar kept-old-versions 2
90: "*Number of oldest versions to keep when a new numbered backup is made.")
91:
92: (defvar kept-new-versions 2
93: "*Number of newest versions to keep when a new numbered backup is made.
94: Includes the new backup. Must be > 0")
95:
96: (defconst require-final-newline nil
97: "*t says silently put a newline at the end whenever a file is saved.
98: Non-nil but not t says ask user whether to add a newline in each such case.
99: nil means don't add newlines.")
100:
101: (defconst auto-save-default t
102: "*t says by default do auto-saving of every file-visiting buffer.")
103:
104: (defconst auto-save-visited-file-name nil
105: "*t says auto-save a buffer in the file it is visiting, when practical.
106: Normally auto-save files are written under other names.")
107:
108: (defconst save-abbrevs nil
109: "*Non-nil means save word abbrevs too when files are saved.
110: Loading an abbrev file sets this to t.")
111:
112: (defconst find-file-run-dired t
113: "*Non-nil says run dired if find-file is given the name of a directory.")
114:
115: (defvar find-file-not-found-hooks nil
116: "List of functions to be called for find-file on nonexistent file.
117: These functions are called as soon as the error is detected.
118: buffer-file-name is already set up.
119: The functions are called in the order given,
120: until one of them returns non-nil.")
121:
122: (defvar find-file-hooks nil
123: "List of functions to be called after a buffer is loaded from a file.
124: The buffer's local variables (if any) will have been processed before the
125: functions are called.")
126:
127: (defvar write-file-hooks nil
128: "List of functions to be called before writing out a buffer to a file.
129: If one of them returns non-nil, the file is considered already written
130: and the rest are not called.")
131:
132: (defconst inhibit-local-variables nil
133: "*Non-nil means query before obeying a file's local-variables list.
134: This applies when the local-variables list is scanned automatically
135: after you find a file. If you explicitly request such a scan with
136: \\[normal-mode], there is no query, regardless of this variable.")
137:
138: (defconst ignore-local-eval nil
139: "*Non-nil means ignore the \"variable\" `eval' in a file's local variables.
140: This applies when the local-variables list is scanned automatically
141: after you find a file. If you explicitly request such a scan with
142: \\[normal-mode], there is no query, regardless of this variable.")
143:
144: ;; Avoid losing in versions where CLASH_DETECTION is disabled.
145: (or (fboundp 'lock-buffer)
146: (fset 'lock-buffer 'ignore))
147: (or (fboundp 'unlock-buffer)
148: (fset 'unlock-buffer 'ignore))
149:
150: (defun pwd ()
151: "Show the current default directory."
152: (interactive nil)
153: (message "Directory %s" default-directory))
154:
155: (defun cd (dir)
156: "Make DIR become the current buffer's default directory."
157: (interactive "DChange default directory: ")
158: (setq dir (expand-file-name dir))
159: (if (not (eq system-type 'vax-vms))
160: (setq dir (file-name-as-directory dir)))
161: (if (not (file-directory-p dir))
162: (error "%s is not a directory" dir)
163: (setq default-directory dir))
164: (pwd))
165:
166: (defun load-file (file)
167: "Load the file FILE of Lisp code."
168: (interactive "fLoad file: ")
169: (load (expand-file-name file) nil nil t))
170:
171: (defun load-library (library)
172: "Load the library named LIBRARY.
173: This is an interface to the function `load'."
174: (interactive "sLoad library: ")
175: (load library))
176:
177: (defun switch-to-buffer-other-window (buffer)
178: "Select buffer BUFFER in another window."
179: (interactive "BSwitch to buffer in other window: ")
180: (let ((pop-up-windows t))
181: (pop-to-buffer buffer t)))
182:
183: (defun find-file (filename)
184: "Edit file FILENAME.
185: Switch to a buffer visiting file FILENAME,
186: creating one if none already exists."
187: (interactive "FFind file: ")
188: (switch-to-buffer (find-file-noselect filename)))
189:
190: (defun find-file-other-window (filename)
191: "Edit file FILENAME, in another window.
192: May create a new window, or reuse an existing one;
193: see the function display-buffer."
194: (interactive "FFind file in other window: ")
195: (switch-to-buffer-other-window (find-file-noselect filename)))
196:
197: (defun find-file-read-only (filename)
198: "Edit file FILENAME but don't save without confirmation.
199: Like find-file but marks buffer as read-only."
200: (interactive "fFind file read-only: ")
201: (find-file filename)
202: (setq buffer-read-only t))
203:
204: (defun find-alternate-file (filename)
205: "Find file FILENAME, select its buffer, kill previous buffer.
206: If the current buffer now contains an empty file that you just visited
207: \(presumably by mistake), use this command to visit the file you really want."
208: (interactive "FFind alternate file: ")
209: (and (buffer-modified-p)
210: ;;; (not buffer-read-only)
211: (not (yes-or-no-p (format "Buffer %s is modified; kill anyway? "
212: (buffer-name))))
213: (error "Aborted"))
214: (let ((obuf (current-buffer))
215: (ofile buffer-file-name)
216: (oname (buffer-name)))
217: (rename-buffer " **lose**")
218: (setq buffer-file-name nil)
219: (unwind-protect
220: (progn
221: (unlock-buffer)
222: (find-file filename))
223: (cond ((eq obuf (current-buffer))
224: (setq buffer-file-name ofile)
225: (lock-buffer)
226: (rename-buffer oname))))
227: (or (eq obuf (current-buffer))
228: (kill-buffer obuf))))
229:
230: (defun create-file-buffer (filename)
231: "Create a suitably named buffer for visiting FILENAME, and return it.
232: FILENAME (sans directory) is used unchanged if that name is free;
233: otherwise a string <2> or <3> or ... is appended to get an unused name."
234: (let ((lastname (file-name-nondirectory filename)))
235: (if (string= lastname "")
236: (setq lastname filename))
237: (generate-new-buffer lastname)))
238:
239: (defconst automount-dir-prefix "^/tmp_mnt/"
240: "Regexp to match the automounter prefix in a directory name.")
241:
242: (defun find-file-noselect (filename &optional nowarn)
243: "Read file FILENAME into a buffer and return the buffer.
244: If a buffer exists visiting FILENAME, return that one,
245: but verify that the file has not changed since visited or saved.
246: The buffer is not selected, just returned to the caller."
247: (setq filename (expand-file-name filename))
248: ;; Get rid of the prefixes added by the automounter.
249: (if (and (string-match automount-dir-prefix filename)
250: (file-exists-p (file-name-directory
251: (substring filename (1- (match-end 0))))))
252: (setq filename (substring filename (1- (match-end 0)))))
253: (if (file-directory-p filename)
254: (if find-file-run-dired
255: (dired-noselect filename)
256: (error "%s is a directory." filename))
257: (let ((buf (get-file-buffer filename))
258: error)
259: (if buf
260: (or nowarn
261: (verify-visited-file-modtime buf)
262: (cond ((not (file-exists-p filename))
263: (error "File %s no longer exists!" filename))
264: ((yes-or-no-p
265: (if (buffer-modified-p buf)
266: "File has changed since last visited or saved. Flush your changes? "
267: "File has changed since last visited or saved. Read from disk? "))
268: (save-excursion
269: (set-buffer buf)
270: (revert-buffer t t)))))
271: (save-excursion
272: (setq buf (create-file-buffer filename))
273: (set-buffer buf)
274: (erase-buffer)
275: (condition-case ()
276: (insert-file-contents filename t)
277: (file-error
278: (setq error t)
279: ;; Run find-file-not-found-hooks until one returns non-nil.
280: (let ((hooks find-file-not-found-hooks))
281: (while (and hooks
282: (not (funcall (car hooks))))
283: (setq hooks (cdr hooks))))))
284: (setq default-directory (file-name-directory filename))
285: (after-find-file error (not nowarn))))
286: buf)))
287:
288: (defun after-find-file (&optional error warn)
289: "Called after finding a file and by the default revert function.
290: Sets buffer mode, parses local variables.
291: Optional args ERROR and WARN: ERROR non-nil means there was an
292: error in reading the file. WARN non-nil means warn if there
293: exists an auto-save file more recent than the visited file.
294: Finishes by calling the functions in find-file-hooks."
295: (setq buffer-read-only (not (file-writable-p buffer-file-name)))
296: (if noninteractive
297: nil
298: (let* (not-serious
299: (msg
300: (cond ((not buffer-read-only)
301: (if (and warn
302: (file-newer-than-file-p (make-auto-save-file-name)
303: buffer-file-name))
304: "Auto save file is newer; consider M-x recover-file"
305: (setq not-serious t)
306: (if error "(New file)" nil)))
307: ((not error)
308: (setq not-serious t)
309: "File is write protected")
310: ((file-attributes buffer-file-name)
311: "File exists, but is read-protected.")
312: ((file-attributes (directory-file-name default-directory))
313: "File not found and directory write-protected")
314: (t
315: "File not found and directory doesn't exist"))))
316: (if msg
317: (progn
318: (message msg)
319: (or not-serious (sit-for 1 t)))))
320: (if auto-save-default
321: (auto-save-mode t)))
322: (normal-mode t)
323: (mapcar 'funcall find-file-hooks))
324:
325: (defun normal-mode (&optional find-file)
326: "Choose the major mode for this buffer automatically.
327: Also sets up any specified local variables of the file.
328: Uses the visited file name, the -*- line, and the local variables spec.
329:
330: This function is called automatically from `find-file'. In that case,
331: if `inhibit-local-variables' is non-`nil' we require confirmation before
332: processing a local variables spec. If you run `normal-mode' explicitly,
333: confirmation is never required."
334: (interactive)
335: (or find-file (funcall (or default-major-mode 'fundamental-mode)))
336: (condition-case err
337: (set-auto-mode)
338: (error (message "File mode specification error: %s"
339: (prin1-to-string err))))
340: (condition-case err
341: (hack-local-variables (not find-file))
342: (error (message "File local-variables error: %s"
343: (prin1-to-string err)))))
344:
345: ;(defvar auto-mode-alist ...) now in loaddefs.el
346: (defun set-auto-mode ()
347: "Select major mode appropriate for current buffer.
348: May base decision on visited file name (See variable auto-mode-list)
349: or on buffer contents (-*- line or local variables spec), but does not look
350: for the \"mode:\" local variable. For that, use hack-local-variables."
351: ;; Look for -*-MODENAME-*- or -*- ... mode: MODENAME; ... -*-
352: (let (beg end mode)
353: (save-excursion
354: (goto-char (point-min))
355: (skip-chars-forward " \t\n")
356: (if (and (search-forward "-*-" (save-excursion (end-of-line) (point)) t)
357: (progn
358: (skip-chars-forward " \t")
359: (setq beg (point))
360: (search-forward "-*-" (save-excursion (end-of-line) (point)) t))
361: (progn
362: (forward-char -3)
363: (skip-chars-backward " \t")
364: (setq end (point))
365: (goto-char beg)
366: (if (search-forward ":" end t)
367: (progn
368: (goto-char beg)
369: (if (let ((case-fold-search t))
370: (search-forward "mode:" end t))
371: (progn
372: (skip-chars-forward " \t")
373: (setq beg (point))
374: (if (search-forward ";" end t)
375: (forward-char -1)
376: (goto-char end))
377: (skip-chars-backward " \t")
378: (setq mode (buffer-substring beg (point))))))
379: (setq mode (buffer-substring beg end)))))
380: (funcall (intern (concat (downcase mode) "-mode")))
381: (let ((alist auto-mode-alist)
382: (name buffer-file-name))
383: (let ((case-fold-search (eq system-type 'vax-vms)))
384: ;; Remove backup-suffixes from file name.
385: (setq name (file-name-sans-versions name))
386: ;; Find first matching alist entry.
387: (while (and (not mode) alist)
388: (if (string-match (car (car alist)) name)
389: (setq mode (cdr (car alist))))
390: (setq alist (cdr alist))))
391: (if mode (funcall mode)))))))
392:
393: (defun hack-local-variables (&optional force)
394: "Parse, and bind or evaluate as appropriate, any local variables
395: for current buffer."
396: ;; Look for "Local variables:" line in last page.
397: (save-excursion
398: (goto-char (point-max))
399: (search-backward "\n\^L" (max (- (point-max) 3000) (point-min)) 'move)
400: (if (let ((case-fold-search t))
401: (and (search-forward "Local Variables:" nil t)
402: (or (not inhibit-local-variables)
403: force
404: (save-window-excursion
405: (switch-to-buffer (current-buffer))
406: (save-excursion
407: (beginning-of-line)
408: (set-window-start (selected-window) (point)))
409: (y-or-n-p (format "Set local variables as specified at end of %s? "
410: (file-name-nondirectory buffer-file-name)))))))
411: (let ((continue t)
412: prefix prefixlen suffix beg)
413: ;; The prefix is what comes before "local variables:" in its line.
414: ;; The suffix is what comes after "local variables:" in its line.
415: (skip-chars-forward " \t")
416: (or (eolp)
417: (setq suffix (buffer-substring (point)
418: (progn (end-of-line) (point)))))
419: (goto-char (match-beginning 0))
420: (or (bolp)
421: (setq prefix
422: (buffer-substring (point)
423: (progn (beginning-of-line) (point)))))
424: (if prefix (setq prefixlen (length prefix)
425: prefix (regexp-quote prefix)))
426: (if suffix (setq suffix (concat (regexp-quote suffix) "$")))
427: (while continue
428: ;; Look at next local variable spec.
429: (if selective-display (re-search-forward "[\n\C-m]")
430: (forward-line 1))
431: ;; Skip the prefix, if any.
432: (if prefix
433: (if (looking-at prefix)
434: (forward-char prefixlen)
435: (error "Local variables entry is missing the prefix")))
436: ;; Find the variable name; strip whitespace.
437: (skip-chars-forward " \t")
438: (setq beg (point))
439: (skip-chars-forward "^:\n")
440: (if (eolp) (error "Missing colon in local variables entry"))
441: (skip-chars-backward " \t")
442: (let* ((str (buffer-substring beg (point)))
443: (var (read str))
444: val)
445: ;; Setting variable named "end" means end of list.
446: (if (string-equal (downcase str) "end")
447: (setq continue nil)
448: ;; Otherwise read the variable value.
449: (skip-chars-forward "^:")
450: (forward-char 1)
451: (setq val (read (current-buffer)))
452: (skip-chars-backward "\n")
453: (skip-chars-forward " \t")
454: (or (if suffix (looking-at suffix) (eolp))
455: (error "Local variables entry is terminated incorrectly"))
456: ;; Set the variable. "Variables" mode and eval are funny.
457: (cond ((eq var 'mode)
458: (funcall (intern (concat (downcase (symbol-name val))
459: "-mode"))))
460: ((eq var 'force) nil)
461: ((eq var 'ignore-local-eval)
462: nil)
463: ((eq var 'eval)
464: (if (or (and ignore-local-eval (not force))
465: (string= (user-login-name) "root"))
466: (message "Ignoring `eval:' in file's local variables")
467: (eval val)))
468: (t (make-local-variable var)
469: (set var val))))))))))
470:
471: (defun set-visited-file-name (filename)
472: "Change name of file visited in current buffer to FILENAME.
473: The next time the buffer is saved it will go in the newly specified file.
474: nil or empty string as argument means make buffer not be visiting any file.
475: Remember to delete the initial contents of the minibuffer
476: if you wish to pass an empty string as the argument."
477: (interactive "FSet visited file name: ")
478: (if filename
479: (setq filename
480: (if (string-equal filename "")
481: nil
482: (expand-file-name filename))))
483: (or (equal filename buffer-file-name)
484: (null filename)
485: (progn
486: (lock-buffer filename)
487: (unlock-buffer)))
488: (if filename
489: (let ((new-name (file-name-nondirectory filename)))
490: (if (string= new-name "")
491: (error "Empty file name"))
492: (if (file-directory-p filename)
493: (error "File %s is a directory" filename))
494: (if (eq system-type 'vax-vms)
495: (setq new-name (downcase new-name)))
496: (setq buffer-file-name filename)
497: (setq default-directory (file-name-directory buffer-file-name))
498: (or (get-buffer new-name) (rename-buffer new-name)))
499: (setq buffer-file-name nil))
500: (setq buffer-backed-up nil)
501: (clear-visited-file-modtime)
502: ;; So that C-x C-w after ftp-find-file
503: ;; writes an ordinary local file in the ordinary way.
504: (kill-local-variable 'write-file-hooks)
505: ;; So that revert works normally after theat C-x C-w.
506: (kill-local-variable 'revert-buffer-function)
507: ;; Rename the auto-save file to go with the new visited name.
508: ;; If auto-save was not already on, turn it on if appropriate.
509: (if buffer-auto-save-file-name
510: (rename-auto-save-file)
511: (auto-save-mode (and buffer-file-name auto-save-default)))
512: (if buffer-file-name
513: (set-buffer-modified-p t)))
514:
515: (defun write-file (filename)
516: "Write current buffer into file FILENAME.
517: Makes buffer visit that file, and marks it not modified."
518: (interactive "FWrite file: ")
519: (or (null filename) (string-equal filename "")
520: (set-visited-file-name filename))
521: (set-buffer-modified-p t)
522: (save-buffer))
523:
524: (defun backup-buffer ()
525: "Make a backup of the disk file visited by the current buffer, if appropriate.
526: This is normally done before saving the buffer the first time.
527: If the value is non-nil, it is the result of `file-modes' on the original file;
528: this means that the caller, after saving the buffer, should change the modes
529: of the new file to agree with the old modes."
530: (and make-backup-files
531: (not buffer-backed-up)
532: (file-exists-p buffer-file-name)
533: (memq (aref (elt (file-attributes buffer-file-name) 8) 0)
534: '(?- ?l))
535: (or (< (length buffer-file-name) 5)
536: (not (string-equal "/tmp/" (substring buffer-file-name 0 5))))
537: (condition-case ()
538: (let* ((backup-info (find-backup-file-name buffer-file-name))
539: (backupname (car backup-info))
540: (targets (cdr backup-info))
541: setmodes)
542: ; (if (file-directory-p buffer-file-name)
543: ; (error "Cannot save buffer in directory %s" buffer-file-name))
544: (condition-case ()
545: (if (or file-precious-flag
546: (file-symlink-p buffer-file-name)
547: backup-by-copying
548: (and backup-by-copying-when-linked
549: (> (file-nlinks buffer-file-name) 1))
550: (and backup-by-copying-when-mismatch
551: (let ((attr (file-attributes buffer-file-name)))
552: (or (nth 9 attr)
553: (/= (nth 2 attr) (user-uid))))))
554: (copy-file buffer-file-name backupname t t)
555: (condition-case ()
556: (delete-file backupname)
557: (file-error nil))
558: (rename-file buffer-file-name backupname t)
559: (setq setmodes (file-modes backupname)))
560: (file-error
561: ;; If trouble writing the backup, write it in ~.
562: (setq backupname (expand-file-name "~/%backup%~"))
563: (message "Cannot write backup file; backing up in ~/%%backup%%~")
564: (sleep-for 1)
565: (condition-case ()
566: (delete-file backupname)
567: (file-error nil))
568: (copy-file buffer-file-name backupname t t)))
569: (setq buffer-backed-up t)
570: (if (and targets
571: (or trim-versions-without-asking
572: (y-or-n-p (format "Delete excess backup versions of %s? "
573: buffer-file-name))))
574: (while targets
575: (condition-case ()
576: (delete-file (car targets))
577: (file-error nil))
578: (setq targets (cdr targets))))
579: setmodes)
580: (file-error nil))))
581:
582: (defun file-name-sans-versions (name)
583: "Return FILENAME sans backup versions or strings.
584: This is a separate procedure so your site-init or startup file can
585: redefine it."
586: (substring name 0
587: (if (eq system-type 'vax-vms)
588: (or (string-match ";[0-9]*\\'" name)
589: (and (string-match "\\." name (string-match "[]>]" name))
590: (string-match "\\.[0-9]*\\'" name (match-end 0))))
591: (string-match "\\(\\.~[0-9]+\\)?~\\'" name))))
592:
593: (defun make-backup-file-name (file)
594: "Create the non-numeric backup file name for FILE.
595: This is a separate function so you can redefine it for customization."
596: (concat file "~"))
597:
598: (defun backup-file-name-p (file)
599: "Return non-nil if FILE is a backup file name (numeric or not).
600: This is a separate function so you can redefine it for customization.
601: You may need to redefine file-name-sans-versions as well."
602: (string-match "~$" file))
603:
604: ;; I believe there is no need to alter this behavior for VMS;
605: ;; since backup files are not made on VMS, it should not get called.
606: (defun find-backup-file-name (fn)
607: "Find a file name for a backup file, and suggestions for deletions.
608: Value is a list whose car is the name for the backup file
609: and whose cdr is a list of old versions to consider deleting now."
610: (if (eq version-control 'never)
611: (list (make-backup-file-name fn))
612: (let* ((base-versions (concat (file-name-nondirectory fn) ".~"))
613: (bv-length (length base-versions))
614: (possibilities (file-name-all-completions
615: base-versions
616: (file-name-directory fn)))
617: (versions (sort (mapcar 'backup-extract-version possibilities)
618: '<))
619: (high-water-mark (apply 'max (cons 0 versions)))
620: (deserve-versions-p
621: (or version-control
622: (> high-water-mark 0)))
623: (number-to-delete (- (length versions)
624: ;; -1 compensates for the backup
625: ;; we are about to make.
626: kept-old-versions kept-new-versions -1)))
627: (if (not deserve-versions-p)
628: (list (make-backup-file-name fn))
629: (cons (concat fn ".~" (int-to-string (1+ high-water-mark)) "~")
630: (if (and (> number-to-delete 0)
631: ;; Delete nothing if there is overflow
632: ;; in the number of versions to keep.
633: (>= (+ kept-new-versions kept-old-versions -1) 0))
634: (mapcar (function (lambda (n)
635: (concat fn ".~"
636: (int-to-string n) "~")))
637: (let ((v (nthcdr kept-old-versions versions)))
638: (rplacd (nthcdr (1- number-to-delete) v) ())
639: v))))))))
640:
641: (defun backup-extract-version (fn)
642: (if (and (string-match "[0-9]+~$" fn bv-length)
643: (= (match-beginning 0) bv-length))
644: (string-to-int (substring fn bv-length -1))
645: 0))
646:
647: (defun file-nlinks (filename)
648: "Return number of names file FILENAME has."
649: (car (cdr (file-attributes filename))))
650:
651: (defun save-buffer (&optional args)
652: "Save current buffer in visited file if modified. Versions described below.
653:
654: By default, makes the previous version into a backup file
655: if previously requested or if this is the first save.
656: With 1 or 3 \\[universal-argument]'s, marks this version
657: to become a backup when the next save is done.
658: With 2 or 3 \\[universal-argument]'s,
659: unconditionally makes the previous version into a backup file.
660: With argument of 0, never makes the previous version into a backup file.
661:
662: If a file's name is FOO, the names of its numbered backup versions are
663: FOO.~i~ for various integers i. A non-numbered backup file is called FOO~.
664: Numeric backups (rather than FOO~) will be made if value of
665: `version-control' is not the atom `never' and either there are already
666: numeric versions of the file being backed up, or `version-control' is
667: non-nil.
668: We don't want excessive versions piling up, so there are variables
669: `kept-old-versions', which tells Emacs how many oldest versions to keep,
670: and `kept-new-versions', which tells how many newest versions to keep.
671: Defaults are 2 old versions and 2 new.
672: `dired-kept-versions' controls dired's clean-directory (.) command.
673: If `trim-versions-without-asking' is nil, system will query user
674: before trimming versions. Otherwise it does it silently."
675: (interactive "p")
676: (let ((modp (buffer-modified-p))
677: (large (> (buffer-size) 50000))
678: (make-backup-files (and make-backup-files (not (eq args 0)))))
679: (and modp (memq args '(16 64)) (setq buffer-backed-up nil))
680: (if (and modp large) (message "Saving file %s..." (buffer-file-name)))
681: (basic-save-buffer)
682: (and modp (memq args '(4 64)) (setq buffer-backed-up nil))))
683:
684: (defun delete-auto-save-file-if-necessary ()
685: "Delete the auto-save filename for the current buffer (if it has one)
686: if variable delete-auto-save-files is non-nil."
687: (and buffer-auto-save-file-name delete-auto-save-files
688: (not (string= buffer-file-name buffer-auto-save-file-name))
689: (progn
690: (condition-case ()
691: (delete-file buffer-auto-save-file-name)
692: (file-error nil))
693: (set-buffer-auto-saved))))
694:
695: (defun basic-save-buffer ()
696: "Save the current buffer in its visited file, if it has been modified."
697: (interactive)
698: (if (buffer-modified-p)
699: (let (setmodes tempsetmodes)
700: (or buffer-file-name
701: (progn
702: (setq buffer-file-name
703: (expand-file-name (read-file-name "File to save in: ") nil)
704: default-directory (file-name-directory buffer-file-name))
705: (auto-save-mode auto-save-default)))
706: (if (not (file-writable-p buffer-file-name))
707: (if (yes-or-no-p
708: (format "File %s is write-protected; try to save anyway? "
709: (file-name-nondirectory buffer-file-name)))
710: (setq tempsetmodes t)
711: (error
712: "Attempt to save to a file which you aren't allowed to write")))
713: (or (verify-visited-file-modtime (current-buffer))
714: (not (file-exists-p buffer-file-name))
715: (yes-or-no-p
716: "Disk file has changed since visited or saved. Save anyway? ")
717: (error "Save not confirmed"))
718: (or buffer-backed-up
719: (setq setmodes (backup-buffer)))
720: (save-restriction
721: (widen)
722: (and (> (point-max) 1)
723: (/= (char-after (1- (point-max))) ?\n)
724: (or (eq require-final-newline t)
725: (and require-final-newline
726: (yes-or-no-p
727: (format "Buffer %s does not end in newline. Add one? "
728: (buffer-name)))))
729: (save-excursion
730: (goto-char (point-max))
731: (insert ?\n)))
732: (let ((hooks write-file-hooks)
733: (done nil))
734: (while (and hooks
735: (not (setq done (funcall (car hooks)))))
736: (setq hooks (cdr hooks)))
737: ;; If a hook returned t, file is already "written".
738: (cond (done (setq setmodes nil))
739: ((not done)
740: (if file-precious-flag
741: ;; If file is precious, rename it away before
742: ;; overwriting it.
743: (let ((rename t) nodelete
744: (file (concat buffer-file-name "#")))
745: (condition-case ()
746: (progn (rename-file buffer-file-name file t)
747: (setq setmodes (file-modes file)))
748: (file-error (setq rename nil nodelete t)))
749: (unwind-protect
750: (progn (clear-visited-file-modtime)
751: (write-region (point-min) (point-max)
752: buffer-file-name nil t)
753: (setq rename nil))
754: ;; If rename is still t, writing failed.
755: ;; So rename the old file back to original name,
756: (if rename
757: (progn
758: (rename-file file buffer-file-name t)
759: (clear-visited-file-modtime))
760: ;; Otherwise we don't need the original file,
761: ;; so flush it. Unless we already lost it.
762: (or nodelete
763: (condition-case ()
764: (delete-file file)
765: (error nil))))))
766: ;; If file not writable, see if we can make it writable
767: ;; temporarily while we write it.
768: ;; But no need to do so if we have just backed it up
769: ;; (setmodes is set) because that says we're superseding.
770: ;; Systems with version numbers need not do this.
771: (if (eq system-type 'vax-vms)
772: (setq setmodes nil tempsetmodes nil))
773: (cond ((and tempsetmodes (not setmodes))
774: ;; Change the mode back, after writing.
775: (setq setmodes (file-modes buffer-file-name))
776: (set-file-modes buffer-file-name 511)))
777: (write-region (point-min) (point-max)
778: buffer-file-name nil t)))))
779: (if setmodes
780: (condition-case ()
781: (set-file-modes buffer-file-name setmodes)
782: (error nil))))
783: (delete-auto-save-file-if-necessary))
784: (message "(No changes need to be saved)")))
785:
786: (defun save-some-buffers (&optional arg exiting)
787: "Save some modified file-visiting buffers. Asks user about each one.
788: Optional argument (the prefix) non-nil means save all with no questions.
789: Optional second argument EXITING means ask about certain non-file buffers
790: as well as about file buffers."
791: (interactive "P")
792: (let (considered (list (buffer-list)))
793: (while list
794: (let ((buffer (car list)))
795: (and (buffer-modified-p buffer)
796: (save-excursion
797: (set-buffer buffer)
798: (and
799: (or buffer-file-name
800: (and exiting buffer-offer-save (> (buffer-size) 0)))
801: (setq considered t)
802: (or arg
803: (y-or-n-p (if buffer-file-name
804: (format "Save file %s? "
805: buffer-file-name)
806: (format "Save buffer %s? " (buffer-name)))))
807: (condition-case ()
808: (save-buffer)
809: (error nil))))))
810: (setq list (cdr list)))
811: (and save-abbrevs abbrevs-changed
812: (progn
813: (setq considered t)
814: (if (or arg
815: (y-or-n-p (format "Save abbrevs in %s? " abbrev-file-name)))
816: (write-abbrev-file nil))
817: ;; Don't keep bothering user if he says no.
818: (setq abbrevs-changed nil)))
819: (if considered
820: (message "")
821: (message "(No files need saving)"))))
822:
823: (defun not-modified ()
824: "Mark current buffer as unmodified, not needing to be saved."
825: (interactive)
826: (message "Modification-flag cleared")
827: (set-buffer-modified-p nil))
828:
829: (defun toggle-read-only ()
830: "Change whether this buffer is visiting its file read-only."
831: (interactive)
832: (setq buffer-read-only (not buffer-read-only))
833: ;; Force mode-line redisplay
834: (set-buffer-modified-p (buffer-modified-p)))
835:
836: (defun insert-file (filename)
837: "Insert contents of file FILENAME into buffer after point.
838: Set mark after the inserted text."
839: (interactive "fInsert file: ")
840: (let ((tem (insert-file-contents filename)))
841: (push-mark (+ (point) (car (cdr tem))))))
842:
843: (defun append-to-file (start end filename)
844: "Append the contents of the region to the end of file FILENAME.
845: When called from a function, expects three arguments,
846: START, END and FILENAME. START and END are buffer positions
847: saying what text to write."
848: (interactive "r\nFAppend to file: ")
849: (write-region start end filename t))
850:
851: (defvar revert-buffer-function nil
852: "Function to use to revert this buffer, or nil to do the default.")
853:
854: (defun revert-buffer (&optional arg noconfirm)
855: "Replace the buffer text with the text of the visited file on disk.
856: This undoes all changes since the file was visited or saved.
857: If latest auto-save file is more recent than the visited file,
858: asks user whether to use that instead.
859: First argument (optional) non-nil means don't offer to use auto-save file.
860: This is the prefix arg when called interactively.
861:
862: Second argument (optional) non-nil means don't ask for confirmation at all.
863:
864: If revert-buffer-function's value is non-nil, it is called to do the work."
865: (interactive "P")
866: (if revert-buffer-function
867: (funcall revert-buffer-function arg noconfirm)
868: (let* ((opoint (point))
869: (auto-save-p (and (null arg) (recent-auto-save-p)
870: buffer-auto-save-file-name
871: (file-readable-p buffer-auto-save-file-name)
872: (y-or-n-p
873: "Buffer has been auto-saved recently. Revert from auto-save file? ")))
874: (file-name (if auto-save-p
875: buffer-auto-save-file-name
876: buffer-file-name)))
877: (cond ((null file-name)
878: (error "Buffer does not seem to be associated with any file"))
879: ((not (file-exists-p file-name))
880: (error "File %s no longer exists!" file-name))
881: ((or noconfirm
882: (yes-or-no-p (format "Revert buffer from file %s? "
883: file-name)))
884: ;; If file was backed up but has changed since,
885: ;; we shd make another backup.
886: (and (not auto-save-p)
887: (not (verify-visited-file-modtime (current-buffer)))
888: (setq buffer-backed-up nil))
889: ;; Discard all the undo information.
890: (or (eq buffer-undo-list t)
891: (setq buffer-undo-list nil))
892: (let ((buffer-read-only nil)
893: ;; Don't record undo info for the revert itself.
894: ;; Doing so chews up too much storage.
895: (buffer-undo-list t))
896: ;; Bind buffer-file-name to nil
897: ;; so that we don't try to lock the file.
898: (let ((buffer-file-name nil))
899: (or auto-save-p
900: (unlock-buffer))
901: (erase-buffer))
902: (insert-file-contents file-name (not auto-save-p)))
903: (goto-char (min opoint (point-max)))
904: (after-find-file nil)
905: t)))))
906:
907: (defun recover-file (file)
908: "Visit file FILE, but get contents from its last auto-save file."
909: (interactive "FRecover file: ")
910: (setq file (expand-file-name file))
911: (if (auto-save-file-name-p file) (error "%s is an auto-save file" file))
912: (let ((file-name (let ((buffer-file-name file))
913: (make-auto-save-file-name))))
914: (cond ((not (file-newer-than-file-p file-name file))
915: (error "Auto-save file %s not current" file-name))
916: ((save-window-excursion
917: (if (not (eq system-type 'vax-vms))
918: (with-output-to-temp-buffer "*Directory*"
919: (buffer-flush-undo standard-output)
920: (call-process "ls" nil standard-output nil
921: "-l" file file-name)))
922: (yes-or-no-p (format "Recover auto save file %s? " file-name)))
923: (switch-to-buffer (find-file-noselect file t))
924: (let ((buffer-read-only nil))
925: (erase-buffer)
926: (insert-file-contents file-name nil))
927: (after-find-file nil))
928: (t (error "Recover-file cancelled."))))
929: (setq buffer-auto-save-file-name nil)
930: (message "Auto-save off in this buffer till you do M-x auto-save-mode."))
931:
932: (defun kill-some-buffers ()
933: "For each buffer, ask whether to kill it."
934: (interactive)
935: (let ((list (buffer-list)))
936: (while list
937: (let* ((buffer (car list))
938: (name (buffer-name buffer)))
939: (and (not (string-equal name ""))
940: (/= (aref name 0) ? )
941: (yes-or-no-p
942: (format "Buffer %s %s. Kill? "
943: name
944: (if (buffer-modified-p buffer)
945: "HAS BEEN EDITED" "is unmodified")))
946: (kill-buffer buffer)))
947: (setq list (cdr list)))))
948:
949: (defun auto-save-mode (arg)
950: "Toggle auto-saving of contents of current buffer.
951: With arg, turn auto-saving on if arg is positive, else off."
952: (interactive "P")
953: (setq buffer-auto-save-file-name
954: (and (if (null arg)
955: (not buffer-auto-save-file-name)
956: (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0))))
957: (if (and buffer-file-name auto-save-visited-file-name
958: (not buffer-read-only))
959: buffer-file-name
960: (make-auto-save-file-name))))
961: (if (interactive-p)
962: (message "Auto-save %s (in this buffer)"
963: (if buffer-auto-save-file-name "on" "off")))
964: buffer-auto-save-file-name)
965:
966: (defun rename-auto-save-file ()
967: "Adjust current buffer's auto save file name for current conditions.
968: Also rename any existing auto save file."
969: (let ((osave buffer-auto-save-file-name))
970: (setq buffer-auto-save-file-name
971: (make-auto-save-file-name))
972: (if (and osave buffer-auto-save-file-name
973: (not (string= buffer-auto-save-file-name buffer-file-name))
974: (not (string= buffer-auto-save-file-name osave))
975: (file-exists-p osave))
976: (rename-file osave buffer-auto-save-file-name t))))
977:
978: (defun make-auto-save-file-name ()
979: "Return file name to use for auto-saves of current buffer.
980: Does not consider auto-save-visited-file-name; that is checked
981: before calling this function.
982: You can redefine this for customization.
983: See also auto-save-file-name-p."
984: (if buffer-file-name
985: (concat (file-name-directory buffer-file-name)
986: "#"
987: (file-name-nondirectory buffer-file-name)
988: "#")
989: (expand-file-name (concat "#%" (buffer-name) "#"))))
990:
991: (defun auto-save-file-name-p (filename)
992: "Return non-nil if FILENAME can be yielded by make-auto-save-file-name.
993: FILENAME should lack slashes.
994: You can redefine this for customization."
995: (string-match "^#.*#$" filename))
996:
997: (defconst list-directory-brief-switches "-CF"
998: "*Switches for list-directory to pass to `ls' for brief listing,")
999: (defconst list-directory-verbose-switches "-l"
1000: "*Switches for list-directory to pass to `ls' for verbose listing,")
1001:
1002: (defun list-directory (dirname &optional verbose)
1003: "Display a list of files in or matching DIRNAME, a la `ls'.
1004: DIRNAME is globbed by the shell if necessary.
1005: Prefix arg (second arg if noninteractive) means supply -l switch to `ls'.
1006: Actions controlled by variables list-directory-brief-switches
1007: and list-directory-verbose-switches."
1008: (interactive (let ((pfx current-prefix-arg))
1009: (list (read-file-name (if pfx "List directory (verbose): "
1010: "List directory (brief): ")
1011: nil default-directory nil)
1012: pfx)))
1013: (let ((switches (if verbose list-directory-verbose-switches
1014: list-directory-brief-switches))
1015: full-dir-p)
1016: (or dirname (setq dirname default-directory))
1017: (if (file-directory-p dirname)
1018: (progn
1019: (setq full-dir-p t)
1020: (or (string-match "/$" dirname)
1021: (setq dirname (concat dirname "/")))))
1022: (setq dirname (expand-file-name dirname))
1023: (with-output-to-temp-buffer "*Directory*"
1024: (buffer-flush-undo standard-output)
1025: (princ "Directory ")
1026: (princ dirname)
1027: (terpri)
1028: (if full-dir-p
1029: (call-process "ls" nil standard-output nil
1030: switches dirname)
1031: (let ((default-directory (file-name-directory dirname)))
1032: (call-process shell-file-name nil standard-output nil
1033: "-c" (concat "exec ls "
1034: switches " "
1035: (file-name-nondirectory dirname))))))))
1036:
1037: (defun save-buffers-kill-emacs (&optional arg)
1038: "Offer to save each buffer, then kill this Emacs fork.
1039: With prefix arg, silently save all file-visiting buffers, then kill."
1040: (interactive "P")
1041: (save-some-buffers arg t)
1042: (and (or (not (memq t (mapcar (function
1043: (lambda (buf) (and (buffer-file-name buf)
1044: (buffer-modified-p buf))))
1045: (buffer-list))))
1046: (yes-or-no-p "Modified buffers exist; exit anyway? "))
1047: (or (not (fboundp 'process-list))
1048: ;; process-list is not defined on VMS.
1049: (let ((processes (process-list))
1050: active)
1051: (while processes
1052: (and (memq (process-status (car processes)) '(run stop open))
1053: (let ((val (process-kill-without-query (car processes))))
1054: (process-kill-without-query (car processes) val)
1055: val)
1056: (setq active t))
1057: (setq processes (cdr processes)))
1058: (or (not active)
1059: (yes-or-no-p "Active processes exist; kill them and exit anyway? "))))
1060: (kill-emacs)))
1061:
1062: (define-key ctl-x-map "\C-f" 'find-file)
1063: (define-key ctl-x-map "\C-q" 'toggle-read-only)
1064: (define-key ctl-x-map "\C-r" 'find-file-read-only)
1065: (define-key ctl-x-map "\C-v" 'find-alternate-file)
1066: (define-key ctl-x-map "\C-s" 'save-buffer)
1067: (define-key ctl-x-map "s" 'save-some-buffers)
1068: (define-key ctl-x-map "\C-w" 'write-file)
1069: (define-key ctl-x-map "i" 'insert-file)
1070: (define-key esc-map "~" 'not-modified)
1071: (define-key ctl-x-map "\C-d" 'list-directory)
1072: (define-key ctl-x-map "\C-c" 'save-buffers-kill-emacs)
1073:
1074: (defvar ctl-x-4-map (make-keymap)
1075: "Keymap for subcommands of C-x 4")
1076: (fset 'ctl-x-4-prefix ctl-x-4-map)
1077: (define-key ctl-x-map "4" 'ctl-x-4-prefix)
1078: (define-key ctl-x-4-map "f" 'find-file-other-window)
1079: (define-key ctl-x-4-map "\C-f" 'find-file-other-window)
1080: (define-key ctl-x-4-map "b" 'switch-to-buffer-other-window)
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