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annotate lisp/auto-save.el @ 5404:91b3aa59f49b
Convert lisp/ to GPLv3.
| author | Mike Sperber <sperber@deinprogramm.de> |
|---|---|
| date | Fri, 15 Oct 2010 15:18:27 +0200 |
| parents | e38acbeb1cae |
| children | b9167d522a9a |
| rev | line source |
|---|---|
| 428 | 1 ;;; auto-save.el -- Safer autosaving for EFS and tmp. |
| 2 | |
| 3 ;; Copyright (C) 1997 Free Software Foundation, Inc. | |
| 4 ;; Copyright (C) 1992 by Sebastian Kremer <sk@thp.uni-koeln.de> | |
| 793 | 5 ;; Copyright (C) 2001, 2002 Ben Wing. |
| 428 | 6 |
| 7 ;; Author: Sebastian Kremer <sk@thp.uni-koeln.de> | |
| 8 ;; Maintainer: XEmacs Development Team | |
| 9 ;; Keywords: extensions, dumped | |
| 10 ;; Version: 1.26 | |
| 11 | |
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12 ;; This file is part of XEmacs. |
| 428 | 13 |
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14 ;; XEmacs is free software: you can redistribute it and/or modify it |
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15 ;; under the terms of the GNU General Public License as published by the |
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16 ;; Free Software Foundation, either version 3 of the License, or (at your |
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17 ;; option) any later version. |
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18 |
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19 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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20 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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21 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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22 ;; for more details. |
| 428 | 23 |
| 24 ;; You should have received a copy of the GNU General Public License | |
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25 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 428 | 26 |
| 27 ;;; Synched up with: Not in FSF | |
| 28 | |
| 29 ;;; Commentary: | |
| 30 | |
| 31 ;; This file is dumped with XEmacs. | |
| 32 | |
| 33 ;; Combines autosaving for efs (to a local or remote directory) | |
| 34 ;; with the ability to do autosaves to a fixed directory on a local | |
| 35 ;; disk, in case NFS is slow. The auto-save file used for | |
| 36 ;; /usr/foo/bar/baz.txt | |
| 37 ;; will be | |
| 464 | 38 ;; AUTOSAVE/#=2Fusr=2Ffoo=2Fbar=2Fbaz.txt#" |
| 428 | 39 ;; assuming AUTOSAVE is the non-nil value of the variable |
| 40 ;; `auto-save-directory'. | |
| 41 | |
| 42 ;; Autosaves even if the current directory is not writable. | |
| 43 | |
| 44 ;; Can limit autosave names to 14 characters using a hash function, | |
| 45 ;; see `auto-save-hash-p'. | |
| 46 | |
| 47 ;; See `auto-save-directory' and `make-auto-save-file-name' and | |
| 48 ;; references therein for complete documentation. | |
| 49 | |
| 50 ;; `M-x recover-all-files' will effectively do recover-file on all | |
| 51 ;; files whose autosave file is newer (one of the benefits of having | |
| 52 ;; all autosave files in the same place). | |
| 53 | |
| 54 ;; This file is dumped with XEmacs. | |
| 55 | |
| 56 ;; If you want to autosave in the fixed directory /tmp/USER-autosave/ | |
| 57 ;; (setq auto-save-directory | |
| 58 ;; (concat "/tmp/" (user-login-name) "-autosave/")) | |
| 59 | |
| 60 ;; If you don't want to save in /tmp (e.g., because it is swap | |
| 464 | 61 ;; mounted) but rather in ~/.autosave/ |
| 428 | 62 ;; (setq auto-save-directory (expand-file-name "~/.autosave/")) |
| 63 | |
| 64 ;; If you want to save each file in its own directory (the default) | |
| 65 ;; (setq auto-save-directory nil) | |
| 66 ;; You still can take advantage of autosaving efs remote files | |
| 67 ;; in a fixed local directory, `auto-save-directory-fallback' will | |
| 68 ;; be used. | |
| 69 | |
| 70 ;; If you want to use 14 character hashed autosave filenames | |
| 71 ;; (setq auto-save-hash-p t) | |
| 72 | |
| 73 ;; Finally, put this line after the others in your ~/.emacs: | |
| 74 ;; (require 'auto-save) | |
| 75 | |
| 76 | |
| 77 ;;; Acknowledgement: | |
| 78 | |
| 79 ;; This code is loosely derived from autosave-in-tmp.el by Jamie | |
| 80 ;; Zawinski <jwz@jwz.org> (the version I had was last modified 22 | |
| 81 ;; dec 90 jwz) and code submitted to ange-ftp-lovers on Sun, 5 Apr | |
| 82 ;; 92 23:20:47 EDT by drw@BOURBAKI.MIT.EDU (Dale R. Worley). | |
| 83 ;; auto-save.el tries to cover the functionality of those two | |
| 84 ;; packages. | |
| 85 | |
| 86 ;; Valuable comments and help from Dale Worley, Andy Norman, Jamie | |
| 87 ;; Zawinski and Sandy Rutherford are gratefully acknowledged. | |
| 88 | |
| 89 (defconst auto-save-version "1.26" | |
| 90 "Version number of auto-save.") | |
| 91 | |
| 92 (provide 'auto-save) | |
| 93 | |
| 94 | |
| 95 ;;; Customization: | |
| 96 | |
| 97 (defgroup auto-save nil | |
| 98 "Autosaving with support for efs and /tmp." | |
| 99 :group 'data) | |
| 100 | |
| 101 (put 'auto-save-interval 'custom-type 'integer) | |
| 102 (put 'auto-save-interval 'factory-value '(300)) | |
| 103 (custom-add-to-group 'auto-save 'auto-save-interval 'custom-variable) | |
| 104 | |
| 105 (defcustom auto-save-directory nil | |
| 106 | |
| 107 ;; Don't make this user-variable-p, it should be set in .emacs and | |
| 108 ;; left at that. In particular, it should remain constant across | |
| 109 ;; several Emacs session to make recover-all-files work. | |
| 110 | |
| 111 ;; However, it's OK for it to be customizable, as most of the | |
| 112 ;; customizable variables are set at the time `.emacs' is read. | |
| 113 ;; -hniksic | |
| 114 | |
| 115 "If non-nil, fixed directory for autosaving: all autosave files go | |
| 116 there. If this directory does not yet exist at load time, it is | |
| 117 created and its mode is set to 0700 so that nobody else can read your | |
| 118 autosave files. | |
| 119 | |
| 120 If nil, each autosave files goes into the same directory as its | |
| 121 corresponding visited file. | |
| 122 | |
| 123 A non-nil `auto-save-directory' could be on a local disk such as in | |
| 124 /tmp, then auto-saves will always be fast, even if NFS or the | |
| 125 automounter is slow. In the usual case of /tmp being locally mounted, | |
| 126 note that if you run emacs on two different machines, they will not | |
| 127 see each other's auto-save files. | |
| 128 | |
| 129 The value \(expand-file-name \"~/.autosave/\"\) might be better if /tmp | |
| 130 is mounted from swap (possible in SunOS, type `df /tmp' to find out) | |
| 131 and thus vanishes after a reboot, or if your system is particularly | |
| 132 thorough when cleaning up /tmp, clearing even non-empty subdirectories. | |
| 133 | |
| 134 It should never be an efs remote filename because that would | |
| 135 defeat `efs-auto-save-remotely'. | |
| 136 | |
| 137 Unless you set `auto-save-hash-p', you shouldn't set this to a | |
| 138 directory in a filesystem that does not support long filenames, since | |
| 139 a file named | |
| 140 | |
| 141 /home/sk/lib/emacs/lisp/auto-save.el | |
| 142 | |
| 143 will have a longish filename like | |
| 144 | |
| 464 | 145 AUTO-SAVE-DIRECTORY/#=2Fhome=2Fsk=2Flib=2Femacs=2Flisp=2Fauto-save.el# |
| 428 | 146 |
| 147 as auto save file. | |
| 148 | |
| 149 See also variables `auto-save-directory-fallback', | |
| 150 `efs-auto-save' and `efs-auto-save-remotely'." | |
| 151 :type '(choice (const :tag "Same as file" nil) | |
| 152 directory) | |
| 153 :group 'auto-save) | |
| 154 | |
| 155 | |
| 156 (defcustom auto-save-hash-p nil | |
| 157 "If non-nil, hashed autosave names of length 14 are used. | |
| 158 This is to avoid autosave filenames longer than 14 characters. | |
| 159 The directory used is `auto-save-hash-directory' regardless of | |
| 160 `auto-save-directory'. | |
| 161 Hashing defeats `recover-all-files', you have to recover files | |
| 162 individually by doing `recover-file'." | |
| 163 :type 'boolean | |
| 164 :group 'auto-save) | |
| 165 | |
| 166 ;;; This defvar is in efs.el now, but doesn't hurt to give it here as | |
| 167 ;;; well so that loading first auto-save.el does not abort. | |
| 168 | |
| 169 ;; #### Now that `auto-save' is dumped, this is looks obnoxious. | |
| 170 (or (boundp 'efs-auto-save) (defvar efs-auto-save 0)) | |
| 171 (or (boundp 'efs-auto-save-remotely) (defvar efs-auto-save-remotely nil)) | |
| 172 | |
| 173 (defcustom auto-save-offer-delete nil | |
| 174 "*If non-nil, `recover-all-files' offers to delete autosave files | |
| 175 that are out of date or were dismissed for recovering. | |
| 176 Special value 'always deletes those files silently." | |
| 177 :type '(choice (const :tag "on" t) | |
| 178 (const :tag "off" nil) | |
| 179 (const :tag "Delete silently" always)) | |
| 180 :group 'auto-save) | |
| 181 | |
| 182 ;;;; end of customization | |
| 183 | |
| 184 | |
| 185 ;;; Preparations to be done at load time | |
| 186 | |
| 187 ;; Do not call expand-file-name! This is evaluated at dump time now! | |
| 188 (defvar auto-save-directory-fallback "~/.autosave/" | |
| 189 ;; not user-variable-p, see above | |
| 190 "Directory used for local autosaving of remote files if | |
| 191 both `auto-save-directory' and `efs-auto-save-remotely' are nil. | |
| 192 Also used if a working directory to be used for autosaving is not writable. | |
| 193 This *must* always be the name of directory that exists or can be | |
| 194 created by you, never nil.") | |
| 195 | |
| 196 (defvar auto-save-hash-directory | |
| 197 (expand-file-name "hash/" (or auto-save-directory | |
| 198 auto-save-directory-fallback)) | |
| 199 "If non-nil, directory used for hashed autosave filenames.") | |
| 200 | |
| 201 (defun auto-save-checked-directory (dir) | |
| 202 "Make sure the directory DIR exists and return it expanded if non-nil." | |
| 203 (when dir | |
| 204 (setq dir (expand-file-name dir)) | |
| 205 ;; Make sure directory exists | |
| 206 (unless (file-directory-p dir) | |
| 207 ;; Else we create and chmod 0700 the directory | |
| 208 (setq dir (directory-file-name dir)) ; some systems need this | |
| 209 (make-directory dir) | |
| 210 (set-file-modes dir #o700)) | |
| 211 dir)) | |
| 212 | |
| 213 ;; This make no sense at dump time | |
| 214 ;; (mapc #'auto-save-check-directory | |
| 215 ; '(auto-save-directory auto-save-directory-fallback)) | |
| 216 | |
| 217 ;(and auto-save-hash-p | |
| 218 ; (auto-save-check-directory 'auto-save-hash-directory)) | |
| 219 | |
| 220 | |
| 221 ;;; Computing an autosave name for a file and vice versa | |
| 222 | |
| 464 | 223 (defun make-auto-save-file-name (&optional file-name) |
| 428 | 224 "Return file name to use for auto-saves of current buffer. |
| 225 Does not consider `auto-save-visited-file-name'; that is checked | |
| 226 before calling this function. | |
| 227 | |
| 228 Offers to autosave all files in the same `auto-save-directory'. All | |
| 229 autosave files can then be recovered at once with function | |
| 230 `recover-all-files'. | |
| 231 | |
| 232 Takes care to make autosave files for files accessed through efs | |
| 233 be local files if variable `efs-auto-save-remotely' is nil. | |
| 234 | |
| 235 Takes care of slashes in buffer names to prevent autosave errors. | |
| 236 | |
| 237 Takes care that autosave files for buffers not visiting any file (such | |
| 238 as `*mail*') from two simultaneous Emacses don't collide by prepending | |
| 239 the Emacs pid. | |
| 240 | |
| 241 Uses 14 character autosave names if `auto-save-hash-p' is true. | |
| 242 | |
| 243 Autosaves even if the current directory is not writable, using | |
| 244 directory `auto-save-directory-fallback'. | |
| 245 | |
| 246 You can redefine this for customization (he he :-). | |
| 247 See also function `auto-save-file-name-p'." | |
| 248 | |
| 249 ;; We have to be very careful about not signalling an error in this | |
| 250 ;; function since files.el does not provide for this (e.g. find-file | |
| 251 ;; would fail for each new file). | |
| 252 | |
| 253 (setq file-name (or file-name | |
| 254 buffer-file-truename | |
| 255 (and buffer-file-name | |
| 256 (expand-file-name buffer-file-name)))) | |
| 793 | 257 (with-trapping-errors |
| 258 :operation 'make-auto-save-file-name | |
| 259 :error-form | |
| 260 (let ((fname | |
| 261 (if file-name | |
| 262 (concat (file-name-directory file-name) | |
| 263 "#" | |
| 264 (file-name-nondirectory file-name) | |
| 265 "#") | |
| 266 (expand-file-name | |
| 267 (concat "#%" (auto-save-escape-name (buffer-name)) | |
| 268 "#"))))) | |
| 269 (if (or (file-writable-p fname) | |
| 270 (file-exists-p fname)) | |
| 271 fname | |
| 272 (expand-file-name (concat "~/" | |
| 273 (file-name-nondirectory fname))))) | |
| 274 (let ( | |
| 275 ;; So autosavename looks like #%...#, roughly as with the | |
| 276 ;; old make-auto-save-file-name function. The | |
| 277 ;; make-temp-name inserts the pid of this Emacs: this | |
| 278 ;; avoids autosaving from two Emacses into the same file. | |
| 279 ;; It cannot be recovered automatically then because in | |
| 280 ;; the next Emacs session (the one after the crash) the | |
| 281 ;; pid will be different, but file-less buffers like | |
| 282 ;; *mail* must be recovered manually anyway. | |
| 428 | 283 |
| 793 | 284 ;; jwz: putting the emacs PID in the auto-save file name is bad |
| 285 ;; news, because that defeats auto-save-recovery of *mail* | |
| 286 ;; buffers -- the (sensible) code in sendmail.el calls | |
| 287 ;; (make-auto-save-file-name) to determine whether there is | |
| 288 ;; unsent, auto-saved mail to recover. If that mail came from a | |
| 289 ;; previous emacs process (far and away the most likely case) | |
| 290 ;; then this can never succeed as the pid differs. | |
| 291 ;;(name-prefix (if file-name nil (make-temp-name "#%"))) | |
| 292 (name-prefix (if file-name nil "#%")) | |
| 428 | 293 |
| 793 | 294 (save-name (or file-name |
| 295 ;; Prevent autosave errors. Buffername | |
| 296 ;; (to become non-dir part of filename) will | |
| 297 ;; be escaped twice. Don't care. | |
| 298 (auto-save-escape-name (buffer-name)))) | |
| 299 (remote-p (and-fboundp 'efs-ftp-path | |
| 300 (stringp file-name) | |
| 301 (efs-ftp-path file-name)))) | |
| 302 ;; Return the appropriate auto save file name: | |
| 303 (expand-file-name;; a buffername needs this, a filename not | |
| 304 (cond (remote-p | |
| 305 (if efs-auto-save-remotely | |
| 306 (auto-save-name-in-same-directory save-name) | |
| 307 ;; We have to use the `fixed-directory' now since the | |
| 308 ;; `same-directory' would be remote. | |
| 309 ;; It will use the fallback if needed. | |
| 310 (auto-save-name-in-fixed-directory save-name))) | |
| 311 ;; Else it is a local file (or a buffer without a file, | |
| 312 ;; hence the name-prefix). | |
| 313 ((or auto-save-directory auto-save-hash-p) | |
| 314 ;; Hashed files always go into the special hash dir, | |
| 315 ;; never in the same directory, to make recognizing | |
| 316 ;; reliable. | |
| 317 (auto-save-name-in-fixed-directory save-name name-prefix)) | |
| 318 (t | |
| 319 (auto-save-name-in-same-directory save-name name-prefix))))))) | |
| 464 | 320 |
| 321 (defun auto-save-file-name-p (filename) | |
| 322 "Return non-nil if FILENAME can be yielded by `make-auto-save-file-name'. | |
| 323 FILENAME should lack slashes. | |
| 324 You can redefine this for customization." | |
| 325 (string-match "\\`#.*#\\'" filename)) | |
| 428 | 326 |
| 327 (defun auto-save-original-name (savename) | |
| 328 "Reverse of `make-auto-save-file-name'. | |
| 329 Returns nil if SAVENAME was not associated with a file (e.g., it came | |
| 330 from an autosaved `*mail*' buffer) or does not appear to be an | |
| 331 autosave file at all. | |
| 332 Hashed files are not understood, see `auto-save-hash-p'." | |
| 333 (let ((basename (file-name-nondirectory savename)) | |
| 334 (savedir (file-name-directory savename))) | |
| 335 (cond ((or (not (auto-save-file-name-p basename)) | |
| 336 (string-match "^#%" basename)) | |
| 337 nil) | |
| 338 ;; now we know it looks like #...# thus substring is safe to use | |
| 339 ((or (equal savedir | |
| 340 (and auto-save-directory | |
| 341 (expand-file-name auto-save-directory))) | |
| 342 ; 2nd arg may be nil | |
| 343 (equal savedir | |
| 344 (expand-file-name auto-save-directory-fallback))) | |
| 345 ;; it is of the `-fixed-directory' type | |
| 464 | 346 (auto-save-unescape-name (substring basename 1 -1))) |
| 428 | 347 (t |
| 348 ;; else it is of `-same-directory' type | |
| 349 (concat savedir (substring basename 1 -1)))))) | |
| 350 | |
| 351 (defun auto-save-name-in-fixed-directory (filename &optional prefix) | |
| 464 | 352 ;; Escape and enclose the whole FILENAME in `#' to make an auto |
| 428 | 353 ;; save file in the auto-save-directory, or if that is nil, in |
| 354 ;; auto-save-directory-fallback (which must be the name of an | |
| 355 ;; existing directory). If the results would be too long for 14 | |
| 356 ;; character filenames, and `auto-save-hash-p' is set, hash FILENAME | |
| 357 ;; into a shorter name. | |
| 358 ;; Optional PREFIX is string to use instead of "#" to prefix name. | |
| 359 (let ((base-name (concat (or prefix "#") | |
| 464 | 360 (auto-save-escape-name filename) |
| 428 | 361 "#"))) |
| 362 (if (and auto-save-hash-p | |
| 363 auto-save-hash-directory | |
| 364 (> (length base-name) 14)) | |
| 365 (expand-file-name (auto-save-cyclic-hash-14 filename) | |
| 366 (auto-save-checked-directory auto-save-hash-directory)) | |
| 367 (expand-file-name base-name | |
| 368 (auto-save-checked-directory | |
| 369 (or auto-save-directory | |
| 370 auto-save-directory-fallback)))))) | |
| 371 | |
| 372 (defun auto-save-name-in-same-directory (filename &optional prefix) | |
| 373 ;; Enclose the non-directory part of FILENAME in `#' to make an auto | |
| 374 ;; save file in the same directory as FILENAME. But if this | |
| 375 ;; directory is not writable, use auto-save-directory-fallback. | |
| 376 ;; FILENAME is assumed to be in non-directory form (no trailing slash). | |
| 440 | 377 ;; It may be a name without a directory part (presumably it really |
| 428 | 378 ;; comes from a buffer name then), the fallback is used then. |
| 379 ;; Optional PREFIX is string to use instead of "#" to prefix name. | |
| 380 (let ((directory (file-name-directory filename))) | |
| 381 (or (null directory) | |
| 382 (file-writable-p directory) | |
| 383 (setq directory (auto-save-checked-directory | |
| 384 auto-save-directory-fallback))) | |
| 385 (concat directory ; (concat nil) is "" | |
| 386 (or prefix "#") | |
| 387 (file-name-nondirectory filename) | |
| 388 "#"))) | |
| 389 | |
| 464 | 390 (defconst auto-save-reserved-chars |
| 391 '( | |
| 392 ?\0 ?\1 ?\2 ?\3 ?\4 ?\5 ?\6 ?\7 ?\10 ?\11 ?\12 ?\13 ?\14 ?\15 ?\16 | |
| 393 ?\17 ?\20 ?\21 ?\22 ?\23 ?\24 ?\25 ?\26 ?\27 ?\30 ?\31 ?\32 ?\33 | |
| 394 ?\34 ?\35 ?\36 ?\37 ?\40 ?? ?* ?: ?< ?> ?| ?/ ?\\ ?& ?^ ?% ?= ?\") | |
| 395 "List of characters disallowed (or potentially disallowed) in filenames. | |
| 396 Includes everything that can get us into trouble under MS Windows or Unix.") | |
| 397 | |
| 398 ;; This code based on code in Bill Perry's url.el. | |
| 399 | |
| 400 (defun auto-save-escape-name (str) | |
| 401 "Escape any evil nasty characters in a potential filename. | |
| 402 Uses quoted-printable-style escaping -- e.g. the dreaded =3D. | |
| 403 Does not use URL escaping (with %) because filenames beginning with #% are | |
| 404 a special signal for non-file buffers." | |
| 405 (mapconcat | |
| 406 (function | |
| 407 (lambda (char) | |
| 408 (if (memq char auto-save-reserved-chars) | |
| 409 (if (< char 16) | |
| 410 (upcase (format "=0%x" char)) | |
| 411 (upcase (format "=%x" char))) | |
| 412 (char-to-string char)))) | |
| 413 str "")) | |
| 414 | |
| 415 (defun auto-save-unhex (x) | |
| 416 (if (> x ?9) | |
| 417 (if (>= x ?a) | |
| 418 (+ 10 (- x ?a)) | |
| 419 (+ 10 (- x ?A))) | |
| 420 (- x ?0))) | |
| 428 | 421 |
| 464 | 422 (defun auto-save-unescape-name (str) |
| 423 "Undo any escaping of evil nasty characters in a file name. | |
| 424 See `auto-save-escape-name'." | |
| 425 (setq str (or str "")) | |
| 426 (let ((tmp "") | |
| 427 (case-fold-search t)) | |
| 428 (while (string-match "=[0-9a-f][0-9a-f]" str) | |
| 429 (let* ((start (match-beginning 0)) | |
| 430 (ch1 (auto-save-unhex (elt str (+ start 1)))) | |
| 431 (code (+ (* 16 ch1) | |
| 432 (auto-save-unhex (elt str (+ start 2)))))) | |
| 433 (setq tmp (concat tmp (substring str 0 start) | |
| 434 (char-to-string code)) | |
| 435 str (substring str (match-end 0))))) | |
| 436 (setq tmp (concat tmp str)) | |
| 437 tmp)) | |
| 438 | |
| 439 ;; The old versions are below. | |
| 428 | 440 |
| 464 | 441 ;(defun auto-save-escape-name (s) |
| 442 ; ;; "Quote any slashes in string S by replacing them with the two | |
| 443 ; ;;characters `\\!'. | |
| 444 ; ;;Also, replace any backslash by double backslash, to make it one-to-one." | |
| 445 ; (let ((limit 0)) | |
| 446 ; (while (string-match "[/\\]" s limit) | |
| 447 ; (setq s (concat (substring s 0 (match-beginning 0)) | |
| 448 ; (if (string= (substring s | |
| 449 ; (match-beginning 0) | |
| 450 ; (match-end 0)) | |
| 451 ; "/") | |
| 452 ; "\\!" | |
| 453 ; "\\\\") | |
| 454 ; (substring s (match-end 0)))) | |
| 455 ; (setq limit (1+ (match-end 0))))) | |
| 456 ; s) | |
| 457 | |
| 458 ;(defun auto-save-unescape-name (s) | |
| 459 ; ;;"Reverse of `auto-save-escape-name'." | |
| 460 ; (let (pos) | |
| 461 ; (while (setq pos (string-match "\\\\[\\!]" s pos)) | |
| 462 ; (setq s (concat (substring s 0 pos) | |
| 463 ; (if (eq ?! (aref s (1+ pos))) "/" "\\") | |
| 464 ; (substring s (+ pos 2))) | |
| 465 ; pos (1+ pos)))) | |
| 466 ; s) | |
| 428 | 467 |
| 468 | |
| 469 ;;; Hashing for autosave names | |
| 470 | |
| 471 ;;; Hashing function contributed by Andy Norman <ange@hplb.hpl.hp.com> | |
| 472 ;;; based upon C code from pot@fly.cnuce.cnr.IT (Francesco Potorti`). | |
| 473 | |
| 474 (defun auto-save-cyclic-hash-14 (s) | |
| 475 ;; "Hash string S into a string of length 14. | |
| 476 ;; A 7-bytes cyclic code for burst correction is calculated on a | |
| 477 ;; byte-by-byte basis. The polynomial used is D^7 + D^6 + D^3 +1. | |
| 478 ;; The resulting string consists of hexadecimal digits [0-9a-f]. | |
| 479 ;; In particular, it contains no slash, so it can be used as autosave name." | |
| 480 (let ((crc (make-vector 7 ?\0))) | |
| 481 (mapc | |
| 482 (lambda (new) | |
| 483 (setq new (+ new (aref crc 6))) | |
| 484 (aset crc 6 (+ (aref crc 5) new)) | |
| 485 (aset crc 5 (aref crc 4)) | |
| 486 (aset crc 4 (aref crc 3)) | |
| 487 (aset crc 3 (+ (aref crc 2) new)) | |
| 488 (aset crc 2 (aref crc 1)) | |
| 489 (aset crc 1 (aref crc 0)) | |
| 490 (aset crc 0 new)) | |
| 491 s) | |
| 492 (format "%02x%02x%02x%02x%02x%02x%02x" | |
| 493 (logand 255 (aref crc 0)) | |
| 494 (logand 255 (aref crc 1)) | |
| 495 (logand 255 (aref crc 2)) | |
| 496 (logand 255 (aref crc 3)) | |
| 497 (logand 255 (aref crc 4)) | |
| 498 (logand 255 (aref crc 5)) | |
| 499 (logand 255 (aref crc 6))))) | |
| 500 | |
| 501 ;; #### It is unclear to me how the following function is useful. It | |
| 502 ;; should be used in `auto-save-name-in-same-directory', if anywhere. | |
| 503 ;; -hniksic | |
| 504 | |
| 505 ;; This leaves two characters that could be used to wrap it in `#' or | |
| 506 ;; make two filenames from it: one for autosaving, and another for a | |
| 464 | 507 ;; file containing the name of the autosaved file, to make hashing |
| 428 | 508 ;; reversible. |
| 509 ;(defun auto-save-cyclic-hash-12 (s) | |
| 510 ; "Outputs the 12-characters ascii hex representation of a 6-bytes | |
| 511 ;cyclic code for burst correction calculated on STRING on a | |
| 512 ;byte-by-byte basis. The used polynomial is D^6 + D^5 + D^4 + D^3 +1." | |
| 513 ; (let ((crc (make-string 6 0))) | |
| 514 ; (mapc | |
| 515 ; (lambda (new) | |
| 516 ; (setq new (+ new (aref crc 5))) | |
| 517 ; (aset crc 5 (+ (aref crc 4) new)) | |
| 518 ; (aset crc 4 (+ (aref crc 3) new)) | |
| 519 ; (aset crc 3 (+ (aref crc 2) new)) | |
| 520 ; (aset crc 2 (aref crc 1)) | |
| 521 ; (aset crc 1 (aref crc 0)) | |
| 522 ; (aset crc 0 new)) | |
| 523 ; s) | |
| 524 ; (format "%02x%02x%02x%02x%02x%02x" | |
| 525 ; (aref crc 0) | |
| 526 ; (aref crc 1) | |
| 527 ; (aref crc 2) | |
| 528 ; (aref crc 3) | |
| 529 ; (aref crc 4) | |
| 530 ; (aref crc 5)))) | |
| 531 | |
| 532 | |
| 533 | |
| 534 ;;; Recovering files | |
| 535 | |
| 536 (defun recover-all-files (&optional silent) | |
| 537 "Do recover-file for all autosave files which are current. | |
| 538 Only works if you have a non-nil `auto-save-directory'. | |
| 539 | |
| 540 Optional prefix argument SILENT means to be silent about non-current | |
| 541 autosave files. This is useful if invoked automatically at Emacs | |
| 542 startup. | |
| 543 | |
| 544 If `auto-save-offer-delete' is t, this function will offer to delete | |
| 545 old or rejected autosave files. | |
| 546 | |
| 547 Hashed files (see `auto-save-hash-p') are not understood, use | |
| 548 `recover-file' to recover them individually." | |
| 549 (interactive "P") | |
| 550 (let ((savefiles (directory-files auto-save-directory | |
| 551 t "\\`#" nil t)) | |
| 552 afile ; the auto save file | |
| 553 file ; its original file | |
| 554 (total 0) ; # of files offered to recover | |
| 555 (count 0)) ; # of files actually recovered | |
| 556 (or (equal (expand-file-name auto-save-directory) | |
| 557 (expand-file-name auto-save-directory-fallback)) | |
| 558 (setq savefiles | |
| 559 (nconc savefiles | |
| 560 (directory-files auto-save-directory-fallback | |
| 561 t "\\`#" nil t)))) | |
| 562 (while savefiles | |
| 563 (setq afile (car savefiles) | |
| 564 file (auto-save-original-name afile) | |
| 565 savefiles (cdr savefiles)) | |
| 566 (cond ((and file (not (file-newer-than-file-p afile file))) | |
| 793 | 567 (warn "Autosave file \"%s\" is not current" afile)) |
| 428 | 568 (t |
| 569 (incf total) | |
| 570 (with-output-to-temp-buffer "*Directory*" | |
| 464 | 571 (buffer-disable-undo standard-output) |
| 572 (save-excursion | |
| 573 (set-buffer "*Directory*") | |
| 574 (setq default-directory (file-name-directory afile)) | |
| 575 (insert-directory afile "-l") | |
| 576 (when file | |
| 577 (setq default-directory (file-name-directory file)) | |
| 578 (insert-directory file "-l")))) | |
| 428 | 579 (if (yes-or-no-p (format "Recover %s from auto save file? " |
| 580 (or file "non-file buffer"))) | |
| 581 (let* ((obuf (current-buffer))) | |
| 582 (set-buffer (if file | |
| 583 (find-file-noselect file t) | |
| 584 (generate-new-buffer "*recovered*"))) | |
| 585 (setq buffer-read-only nil) | |
| 586 (erase-buffer) | |
| 771 | 587 ;; see comment in `revert-buffer' in files.el about |
| 588 ;; why it's safe to always use `escape-quoted'. | |
| 589 (let ((coding-system-for-read 'escape-quoted)) | |
| 590 (insert-file-contents afile nil)) | |
| 428 | 591 (ignore-errors |
| 592 (after-find-file nil)) | |
| 593 (setq buffer-auto-save-file-name nil) | |
| 594 (incf count) | |
| 595 (message "\ | |
| 596 Auto-save off in buffer \"%s\" till you do M-x auto-save-mode." | |
| 597 (buffer-name)) | |
| 598 (set-buffer obuf) | |
| 599 (sit-for 1)) | |
| 600 ;; If not used for recovering, offer to delete | |
| 601 ;; autosave file | |
| 602 (and auto-save-offer-delete | |
| 603 (or (eq 'always auto-save-offer-delete) | |
| 604 (yes-or-no-p | |
| 605 (format "Delete autosave file for `%s'? " file))) | |
| 606 (delete-file afile)))))) | |
| 607 (if (zerop total) | |
| 608 (or silent (message "Nothing to recover.")) | |
| 609 (message "%d/%d file%s recovered." count total (if (= count 1) "" "s")))) | |
| 610 (and (get-buffer "*Directory*") | |
| 611 (kill-buffer "*Directory*"))) | |
| 612 | |
| 613 ;;; auto-save.el ends here |