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be010748 RS |
1 | ;;; jka-compr.el --- reading/writing/loading compressed files |
2 | ||
bbf5eb28 | 3 | ;; Copyright (C) 1993, 1994, 1995, 1997 Free Software Foundation, Inc. |
acd622cc RS |
4 | |
5 | ;; Author: jka@ece.cmu.edu (Jay K. Adams) | |
acd622cc RS |
6 | ;; Keywords: data |
7 | ||
f4454a14 RS |
8 | ;; This file is part of GNU Emacs. |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
22 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
23 | ;; Boston, MA 02111-1307, USA. | |
f4454a14 | 24 | |
acd622cc RS |
25 | ;;; Commentary: |
26 | ||
b578f267 EN |
27 | ;; This package implements low-level support for reading, writing, |
28 | ;; and loading compressed files. It hooks into the low-level file | |
29 | ;; I/O functions (including write-region and insert-file-contents) so | |
30 | ;; that they automatically compress or uncompress a file if the file | |
31 | ;; appears to need it (based on the extension of the file name). | |
32 | ;; Packages like Rmail, VM, GNUS, and Info should be able to work | |
33 | ;; with compressed files without modification. | |
34 | ||
35 | ||
36 | ;; INSTRUCTIONS: | |
37 | ;; | |
38 | ;; To use jka-compr, simply load this package, and edit as usual. | |
39 | ;; Its operation should be transparent to the user (except for | |
40 | ;; messages appearing when a file is being compressed or | |
41 | ;; uncompressed). | |
42 | ;; | |
43 | ;; The variable, jka-compr-compression-info-list can be used to | |
44 | ;; customize jka-compr to work with other compression programs. | |
45 | ;; The default value of this variable allows jka-compr to work with | |
46 | ;; Unix compress and gzip. | |
47 | ;; | |
48 | ;; If you are concerned about the stderr output of gzip and other | |
49 | ;; compression/decompression programs showing up in your buffers, you | |
50 | ;; should set the discard-error flag in the compression-info-list. | |
51 | ;; This will cause the stderr of all programs to be discarded. | |
52 | ;; However, it also causes emacs to call compression/uncompression | |
53 | ;; programs through a shell (which is specified by jka-compr-shell). | |
54 | ;; This may be a drag if, on your system, starting up a shell is | |
55 | ;; slow. | |
56 | ;; | |
57 | ;; If you don't want messages about compressing and decompressing | |
58 | ;; to show up in the echo area, you can set the compress-name and | |
59 | ;; decompress-name fields of the jka-compr-compression-info-list to | |
60 | ;; nil. | |
61 | ||
62 | ||
63 | ;; APPLICATION NOTES: | |
64 | ;; | |
65 | ;; crypt++ | |
66 | ;; jka-compr can coexist with crpyt++ if you take all the decompression | |
67 | ;; entries out of the crypt-encoding-list. Clearly problems will arise if | |
68 | ;; you have two programs trying to compress/decompress files. jka-compr | |
69 | ;; will not "work with" crypt++ in the following sense: you won't be able to | |
70 | ;; decode encrypted compressed files--that is, files that have been | |
71 | ;; compressed then encrypted (in that order). Theoretically, crypt++ and | |
72 | ;; jka-compr could properly handle a file that has been encrypted then | |
73 | ;; compressed, but there is little point in trying to compress an encrypted | |
74 | ;; file. | |
75 | ;; | |
76 | ||
77 | ||
78 | ;; ACKNOWLEDGMENTS | |
79 | ;; | |
80 | ;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people | |
81 | ;; have made helpful suggestions, reported bugs, and even fixed bugs in | |
82 | ;; jka-compr. I recall the following people as being particularly helpful. | |
83 | ;; | |
84 | ;; Jean-loup Gailly | |
85 | ;; David Hughes | |
86 | ;; Richard Pieri | |
87 | ;; Daniel Quinlan | |
88 | ;; Chris P. Ross | |
89 | ;; Rick Sladkey | |
90 | ;; | |
91 | ;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for | |
92 | ;; Version 18 of Emacs. | |
93 | ;; | |
94 | ;; After I had made progress on the original jka-compr for V18, I learned of a | |
95 | ;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly | |
96 | ;; what I was trying to do. I looked over the jam-zcat source code and | |
97 | ;; probably got some ideas from it. | |
98 | ;; | |
acd622cc RS |
99 | |
100 | ;;; Code: | |
101 | ||
bbf5eb28 RS |
102 | (defgroup compression nil |
103 | "Data compression utilities" | |
104 | :group 'data) | |
105 | ||
106 | (defgroup jka-compr nil | |
107 | "jka-compr customization" | |
108 | :group 'compression) | |
109 | ||
110 | ||
111 | (defcustom jka-compr-shell "sh" | |
acd622cc RS |
112 | "*Shell to be used for calling compression programs. |
113 | The value of this variable only matters if you want to discard the | |
114 | stderr of a compression/decompression program (see the documentation | |
bbf5eb28 RS |
115 | for `jka-compr-compression-info-list')." |
116 | :type 'string | |
117 | :group 'jka-compr) | |
acd622cc RS |
118 | |
119 | (defvar jka-compr-use-shell t) | |
120 | ||
121 | ||
122 | ;;; I have this defined so that .Z files are assumed to be in unix | |
123 | ;;; compress format; and .gz files, in gzip format. | |
bbf5eb28 | 124 | (defcustom jka-compr-compression-info-list |
acd622cc | 125 | ;;[regexp |
ede9c6a8 RS |
126 | ;; compr-message compr-prog compr-args |
127 | ;; uncomp-message uncomp-prog uncomp-args | |
acd622cc | 128 | ;; can-append auto-mode-flag] |
094cf604 | 129 | '(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'" |
acd622cc RS |
130 | "compressing" "compress" ("-c") |
131 | "uncompressing" "uncompress" ("-c") | |
132 | nil t] | |
74b2c737 RS |
133 | ["\\.tgz\\'" |
134 | "zipping" "gzip" ("-c" "-q") | |
135 | "unzipping" "gzip" ("-c" "-q" "-d") | |
136 | t nil] | |
094cf604 | 137 | ["\\.gz\\(~\\|\\.~[0-9]+~\\)?\\'" |
acd622cc RS |
138 | "zipping" "gzip" ("-c" "-q") |
139 | "unzipping" "gzip" ("-c" "-q" "-d") | |
140 | t t]) | |
141 | ||
142 | "List of vectors that describe available compression techniques. | |
143 | Each element, which describes a compression technique, is a vector of | |
ede9c6a8 RS |
144 | the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS |
145 | UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS | |
146 | APPEND-FLAG EXTENSION], where: | |
acd622cc RS |
147 | |
148 | regexp is a regexp that matches filenames that are | |
149 | compressed with this format | |
150 | ||
ede9c6a8 RS |
151 | compress-msg is the message to issue to the user when doing this |
152 | type of compression (nil means no message) | |
153 | ||
acd622cc RS |
154 | compress-program is a program that performs this compression |
155 | ||
156 | compress-args is a list of args to pass to the compress program | |
157 | ||
ede9c6a8 RS |
158 | uncompress-msg is the message to issue to the user when doing this |
159 | type of uncompression (nil means no message) | |
acd622cc RS |
160 | |
161 | uncompress-program is a program that performs this compression | |
162 | ||
163 | uncompress-args is a list of args to pass to the uncompress program | |
164 | ||
165 | append-flag is non-nil if this compression technique can be | |
166 | appended | |
167 | ||
168 | auto-mode flag non-nil means strip the regexp from file names | |
169 | before attempting to set the mode. | |
170 | ||
8fb1a583 | 171 | Because of the way `call-process' is defined, discarding the stderr output of |
acd622cc | 172 | a program adds the overhead of starting a shell each time the program is |
bbf5eb28 RS |
173 | invoked." |
174 | :type '(repeat (vector regexp | |
175 | (choice :tag "Compress Message" | |
176 | (string :format "%v") | |
177 | (const :tag "No Message" nil)) | |
178 | (string :tag "Compress Program") | |
179 | (repeat :tag "Compress Arguments" string) | |
180 | (choice :tag "Uncompress Message" | |
181 | (string :format "%v") | |
182 | (const :tag "No Message" nil)) | |
183 | (string :tag "Uncompress Program") | |
184 | (repeat :tag "Uncompress Arguments" string) | |
185 | (boolean :tag "Append") | |
186 | (boolean :tag "Auto Mode"))) | |
187 | :group 'jka-compr) | |
acd622cc | 188 | |
74b2c737 RS |
189 | (defvar jka-compr-mode-alist-additions |
190 | (list (cons "\\.tgz\\'" 'tar-mode)) | |
191 | "A list of pairs to add to auto-mode-alist when jka-compr is installed.") | |
acd622cc | 192 | |
555235e6 RS |
193 | (defvar jka-compr-file-name-handler-entry |
194 | nil | |
195 | "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.") | |
555235e6 | 196 | \f |
43a3bdcc | 197 | ;;; Functions for accessing the return value of jka-compr-get-compression-info |
acd622cc RS |
198 | (defun jka-compr-info-regexp (info) (aref info 0)) |
199 | (defun jka-compr-info-compress-message (info) (aref info 1)) | |
200 | (defun jka-compr-info-compress-program (info) (aref info 2)) | |
201 | (defun jka-compr-info-compress-args (info) (aref info 3)) | |
202 | (defun jka-compr-info-uncompress-message (info) (aref info 4)) | |
203 | (defun jka-compr-info-uncompress-program (info) (aref info 5)) | |
204 | (defun jka-compr-info-uncompress-args (info) (aref info 6)) | |
205 | (defun jka-compr-info-can-append (info) (aref info 7)) | |
206 | (defun jka-compr-info-strip-extension (info) (aref info 8)) | |
207 | ||
208 | ||
209 | (defun jka-compr-get-compression-info (filename) | |
210 | "Return information about the compression scheme of FILENAME. | |
211 | The determination as to which compression scheme, if any, to use is | |
99bee6a4 | 212 | based on the filename itself and `jka-compr-compression-info-list'." |
acd622cc RS |
213 | (catch 'compression-info |
214 | (let ((case-fold-search nil)) | |
215 | (mapcar | |
216 | (function (lambda (x) | |
217 | (and (string-match (jka-compr-info-regexp x) filename) | |
218 | (throw 'compression-info x)))) | |
219 | jka-compr-compression-info-list) | |
220 | nil))) | |
221 | ||
222 | ||
223 | (put 'compression-error 'error-conditions '(compression-error file-error error)) | |
224 | ||
225 | ||
30c78e11 | 226 | (defvar jka-compr-acceptable-retval-list '(0 2 141)) |
acd622cc RS |
227 | |
228 | ||
229 | (defun jka-compr-error (prog args infile message &optional errfile) | |
230 | ||
231 | (let ((errbuf (get-buffer-create " *jka-compr-error*")) | |
232 | (curbuf (current-buffer))) | |
75e9c107 RS |
233 | (with-current-buffer errbuf |
234 | (widen) (erase-buffer) | |
235 | (insert (format "Error while executing \"%s %s < %s\"\n\n" | |
236 | prog | |
237 | (mapconcat 'identity args " ") | |
238 | infile)) | |
239 | ||
240 | (and errfile | |
241 | (insert-file-contents errfile))) | |
acd622cc RS |
242 | (display-buffer errbuf)) |
243 | ||
75e9c107 RS |
244 | (signal 'compression-error |
245 | (list "Opening input file" (format "error %s" message) infile))) | |
acd622cc RS |
246 | |
247 | ||
248 | (defvar jka-compr-dd-program | |
249 | "/bin/dd") | |
250 | ||
251 | ||
dfe05fac | 252 | (defvar jka-compr-dd-blocksize 256) |
acd622cc RS |
253 | |
254 | ||
255 | (defun jka-compr-partial-uncompress (prog message args infile beg len) | |
256 | "Call program PROG with ARGS args taking input from INFILE. | |
257 | Fourth and fifth args, BEG and LEN, specify which part of the output | |
ee139ed3 | 258 | to keep: LEN chars starting BEG chars from the beginning." |
acd622cc RS |
259 | (let* ((skip (/ beg jka-compr-dd-blocksize)) |
260 | (prefix (- beg (* skip jka-compr-dd-blocksize))) | |
261 | (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize)))) | |
262 | (start (point)) | |
acd622cc RS |
263 | (err-file (jka-compr-make-temp-name)) |
264 | (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null" | |
265 | prog | |
266 | (mapconcat 'identity args " ") | |
267 | err-file | |
268 | jka-compr-dd-program | |
269 | jka-compr-dd-blocksize | |
270 | skip | |
dfe05fac RS |
271 | ;; dd seems to be unreliable about |
272 | ;; providing the last block. So, always | |
273 | ;; read one more than you think you need. | |
274 | (if count (concat "count=" (1+ count)) "")))) | |
acd622cc RS |
275 | |
276 | (unwind-protect | |
277 | (or (memq (call-process jka-compr-shell | |
278 | infile t nil "-c" | |
279 | run-string) | |
280 | jka-compr-acceptable-retval-list) | |
281 | ||
282 | (jka-compr-error prog args infile message err-file)) | |
283 | ||
284 | (jka-compr-delete-temp-file err-file)) | |
285 | ||
ee139ed3 | 286 | ;; Delete the stuff after what we want, if there is any. |
acd622cc | 287 | (and |
dfe05fac | 288 | len |
ee139ed3 | 289 | (< (+ start prefix len) (point)) |
dfe05fac | 290 | (delete-region (+ start prefix len) (point))) |
acd622cc | 291 | |
ee139ed3 | 292 | ;; Delete the stuff before what we want. |
acd622cc RS |
293 | (delete-region start (+ start prefix)))) |
294 | ||
295 | ||
296 | (defun jka-compr-call-process (prog message infile output temp args) | |
297 | (if jka-compr-use-shell | |
298 | ||
299 | (let ((err-file (jka-compr-make-temp-name))) | |
300 | ||
301 | (unwind-protect | |
302 | ||
303 | (or (memq | |
304 | (call-process jka-compr-shell infile | |
305 | (if (stringp output) nil output) | |
306 | nil | |
307 | "-c" | |
308 | (format "%s %s 2> %s %s" | |
309 | prog | |
310 | (mapconcat 'identity args " ") | |
311 | err-file | |
312 | (if (stringp output) | |
313 | (concat "> " output) | |
314 | ""))) | |
315 | jka-compr-acceptable-retval-list) | |
316 | ||
317 | (jka-compr-error prog args infile message err-file)) | |
318 | ||
319 | (jka-compr-delete-temp-file err-file))) | |
320 | ||
321 | (or (zerop | |
322 | (apply 'call-process | |
323 | prog | |
324 | infile | |
325 | (if (stringp output) temp output) | |
326 | nil | |
327 | args)) | |
328 | (jka-compr-error prog args infile message)) | |
329 | ||
330 | (and (stringp output) | |
75e9c107 | 331 | (with-current-buffer temp |
acd622cc | 332 | (write-region (point-min) (point-max) output) |
75e9c107 | 333 | (erase-buffer))))) |
acd622cc RS |
334 | |
335 | ||
336 | ;;; Support for temp files. Much of this was inspired if not lifted | |
337 | ;;; from ange-ftp. | |
338 | ||
bbf5eb28 | 339 | (defcustom jka-compr-temp-name-template |
1d2517f2 RS |
340 | (expand-file-name "jka-com" |
341 | (or (getenv "TMPDIR") "/tmp/")) | |
bbf5eb28 RS |
342 | There should be no more than seven characters after the final `/'." |
343 | :type 'string | |
344 | :group 'jka-compr) | |
acd622cc RS |
345 | |
346 | (defvar jka-compr-temp-name-table (make-vector 31 nil)) | |
347 | ||
348 | (defun jka-compr-make-temp-name (&optional local-copy) | |
349 | "This routine will return the name of a new file." | |
350 | (let* ((lastchar ?a) | |
351 | (prevchar ?a) | |
352 | (template (concat jka-compr-temp-name-template "aa")) | |
353 | (lastpos (1- (length template))) | |
354 | (not-done t) | |
355 | file | |
356 | entry) | |
357 | ||
358 | (while not-done | |
359 | (aset template lastpos lastchar) | |
360 | (setq file (concat (make-temp-name template) "#")) | |
361 | (setq entry (intern file jka-compr-temp-name-table)) | |
362 | (if (or (get entry 'active) | |
363 | (file-exists-p file)) | |
364 | ||
365 | (progn | |
366 | (setq lastchar (1+ lastchar)) | |
367 | (if (> lastchar ?z) | |
368 | (progn | |
369 | (setq prevchar (1+ prevchar)) | |
370 | (setq lastchar ?a) | |
371 | (if (> prevchar ?z) | |
372 | (error "Can't allocate temp file.") | |
373 | (aset template (1- lastpos) prevchar))))) | |
374 | ||
375 | (put entry 'active (not local-copy)) | |
376 | (setq not-done nil))) | |
377 | ||
378 | file)) | |
379 | ||
380 | ||
381 | (defun jka-compr-delete-temp-file (temp) | |
382 | ||
383 | (put (intern temp jka-compr-temp-name-table) | |
384 | 'active nil) | |
385 | ||
386 | (condition-case () | |
387 | (delete-file temp) | |
388 | (error nil))) | |
389 | ||
390 | ||
391 | (defun jka-compr-write-region (start end file &optional append visit) | |
acd622cc RS |
392 | (let* ((filename (expand-file-name file)) |
393 | (visit-file (if (stringp visit) (expand-file-name visit) filename)) | |
394 | (info (jka-compr-get-compression-info visit-file))) | |
395 | ||
396 | (if info | |
397 | ||
398 | (let ((can-append (jka-compr-info-can-append info)) | |
399 | (compress-program (jka-compr-info-compress-program info)) | |
400 | (compress-message (jka-compr-info-compress-message info)) | |
401 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
402 | (uncompress-message (jka-compr-info-uncompress-message info)) | |
403 | (compress-args (jka-compr-info-compress-args info)) | |
404 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
acd622cc | 405 | (base-name (file-name-nondirectory visit-file)) |
75e9c107 | 406 | temp-file temp-buffer) |
acd622cc | 407 | |
75e9c107 RS |
408 | (setq temp-buffer (get-buffer-create " *jka-compr-wr-temp*")) |
409 | (with-current-buffer temp-buffer | |
410 | (widen) (erase-buffer)) | |
acd622cc | 411 | |
30c78e11 RS |
412 | (if (and append |
413 | (not can-append) | |
414 | (file-exists-p filename)) | |
415 | ||
416 | (let* ((local-copy (file-local-copy filename)) | |
417 | (local-file (or local-copy filename))) | |
418 | ||
419 | (setq temp-file local-file)) | |
420 | ||
421 | (setq temp-file (jka-compr-make-temp-name))) | |
acd622cc RS |
422 | |
423 | (and | |
424 | compress-message | |
425 | (message "%s %s..." compress-message base-name)) | |
30c78e11 | 426 | |
8fb1a583 RS |
427 | (jka-compr-run-real-handler 'write-region |
428 | (list start end temp-file t 'dont)) | |
acd622cc RS |
429 | |
430 | (jka-compr-call-process compress-program | |
431 | (concat compress-message | |
432 | " " base-name) | |
433 | temp-file | |
434 | temp-buffer | |
435 | nil | |
436 | compress-args) | |
437 | ||
75e9c107 RS |
438 | (with-current-buffer temp-buffer |
439 | (jka-compr-run-real-handler 'write-region | |
440 | (list (point-min) (point-max) | |
441 | filename | |
442 | (and append can-append) 'dont)) | |
443 | (erase-buffer)) | |
acd622cc RS |
444 | |
445 | (jka-compr-delete-temp-file temp-file) | |
446 | ||
447 | (and | |
448 | compress-message | |
449 | (message "%s %s...done" compress-message base-name)) | |
450 | ||
451 | (cond | |
452 | ((eq visit t) | |
453 | (setq buffer-file-name filename) | |
454 | (set-visited-file-modtime)) | |
455 | ((stringp visit) | |
456 | (setq buffer-file-name visit) | |
457 | (let ((buffer-file-name filename)) | |
458 | (set-visited-file-modtime)))) | |
459 | ||
460 | (and (or (eq visit t) | |
461 | (eq visit nil) | |
462 | (stringp visit)) | |
463 | (message "Wrote %s" visit-file)) | |
464 | ||
465 | nil) | |
466 | ||
8fb1a583 RS |
467 | (jka-compr-run-real-handler 'write-region |
468 | (list start end filename append visit))))) | |
acd622cc RS |
469 | |
470 | ||
54b2aa5c | 471 | (defun jka-compr-insert-file-contents (file &optional visit beg end replace) |
acd622cc RS |
472 | (barf-if-buffer-read-only) |
473 | ||
474 | (and (or beg end) | |
475 | visit | |
476 | (error "Attempt to visit less than an entire file")) | |
477 | ||
478 | (let* ((filename (expand-file-name file)) | |
479 | (info (jka-compr-get-compression-info filename))) | |
480 | ||
481 | (if info | |
482 | ||
483 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
484 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
485 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
486 | (base-name (file-name-nondirectory filename)) | |
487 | (notfound nil) | |
8fb1a583 RS |
488 | (local-copy |
489 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc RS |
490 | local-file |
491 | size start) | |
492 | ||
493 | (setq local-file (or local-copy filename)) | |
494 | ||
495 | (and | |
496 | visit | |
497 | (setq buffer-file-name filename)) | |
498 | ||
499 | (unwind-protect ; to make sure local-copy gets deleted | |
500 | ||
501 | (progn | |
502 | ||
503 | (and | |
504 | uncompress-message | |
505 | (message "%s %s..." uncompress-message base-name)) | |
506 | ||
507 | (condition-case error-code | |
508 | ||
509 | (progn | |
094cf604 RS |
510 | (if replace |
511 | (goto-char (point-min))) | |
acd622cc RS |
512 | (setq start (point)) |
513 | (if (or beg end) | |
514 | (jka-compr-partial-uncompress uncompress-program | |
515 | (concat uncompress-message | |
516 | " " base-name) | |
517 | uncompress-args | |
518 | local-file | |
519 | (or beg 0) | |
520 | (if (and beg end) | |
521 | (- end beg) | |
522 | end)) | |
ae849784 RS |
523 | ;; If visiting, bind off buffer-file-name so that |
524 | ;; file-locking will not ask whether we should | |
525 | ;; really edit the buffer. | |
526 | (let ((buffer-file-name | |
527 | (if visit nil buffer-file-name))) | |
528 | (jka-compr-call-process uncompress-program | |
529 | (concat uncompress-message | |
530 | " " base-name) | |
531 | local-file | |
532 | t | |
533 | nil | |
534 | uncompress-args))) | |
acd622cc | 535 | (setq size (- (point) start)) |
094cf604 RS |
536 | (if replace |
537 | (let* ((del-beg (point)) | |
538 | (del-end (+ del-beg size))) | |
539 | (delete-region del-beg | |
540 | (min del-end (point-max))))) | |
541 | (goto-char start)) | |
acd622cc RS |
542 | (error |
543 | (if (and (eq (car error-code) 'file-error) | |
544 | (eq (nth 3 error-code) local-file)) | |
545 | (if visit | |
546 | (setq notfound error-code) | |
547 | (signal 'file-error | |
548 | (cons "Opening input file" | |
549 | (nthcdr 2 error-code)))) | |
550 | (signal (car error-code) (cdr error-code)))))) | |
551 | ||
552 | (and | |
553 | local-copy | |
554 | (file-exists-p local-copy) | |
555 | (delete-file local-copy))) | |
556 | ||
557 | (and | |
558 | visit | |
559 | (progn | |
8fb1a583 | 560 | (unlock-buffer) |
acd622cc RS |
561 | (setq buffer-file-name filename) |
562 | (set-visited-file-modtime))) | |
563 | ||
564 | (and | |
565 | uncompress-message | |
566 | (message "%s %s...done" uncompress-message base-name)) | |
567 | ||
568 | (and | |
569 | visit | |
570 | notfound | |
571 | (signal 'file-error | |
572 | (cons "Opening input file" (nth 2 notfound)))) | |
573 | ||
094cf604 RS |
574 | ;; Run the functions that insert-file-contents would. |
575 | (let ((p after-insert-file-functions) | |
576 | (insval size)) | |
577 | (while p | |
578 | (setq insval (funcall (car p) size)) | |
579 | (if insval | |
580 | (progn | |
581 | (or (integerp insval) | |
582 | (signal 'wrong-type-argument | |
583 | (list 'integerp insval))) | |
584 | (setq size insval))) | |
585 | (setq p (cdr p)))) | |
586 | ||
acd622cc RS |
587 | (list filename size)) |
588 | ||
8fb1a583 RS |
589 | (jka-compr-run-real-handler 'insert-file-contents |
590 | (list file visit beg end replace))))) | |
acd622cc RS |
591 | |
592 | ||
593 | (defun jka-compr-file-local-copy (file) | |
acd622cc RS |
594 | (let* ((filename (expand-file-name file)) |
595 | (info (jka-compr-get-compression-info filename))) | |
596 | ||
597 | (if info | |
598 | ||
599 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
600 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
601 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
602 | (base-name (file-name-nondirectory filename)) | |
8fb1a583 RS |
603 | (local-copy |
604 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc | 605 | (temp-file (jka-compr-make-temp-name t)) |
30c78e11 | 606 | (temp-buffer (get-buffer-create " *jka-compr-flc-temp*")) |
acd622cc | 607 | (notfound nil) |
acd622cc RS |
608 | local-file) |
609 | ||
610 | (setq local-file (or local-copy filename)) | |
611 | ||
612 | (unwind-protect | |
613 | ||
75e9c107 | 614 | (with-current-buffer temp-buffer |
acd622cc RS |
615 | |
616 | (and | |
617 | uncompress-message | |
618 | (message "%s %s..." uncompress-message base-name)) | |
acd622cc RS |
619 | |
620 | (jka-compr-call-process uncompress-program | |
621 | (concat uncompress-message | |
622 | " " base-name) | |
623 | local-file | |
624 | t | |
625 | nil | |
626 | uncompress-args) | |
627 | ||
628 | (and | |
629 | uncompress-message | |
630 | (message "%s %s...done" uncompress-message base-name)) | |
631 | ||
632 | (write-region | |
633 | (point-min) (point-max) temp-file nil 'dont)) | |
634 | ||
635 | (and | |
636 | local-copy | |
637 | (file-exists-p local-copy) | |
638 | (delete-file local-copy)) | |
639 | ||
acd622cc RS |
640 | (kill-buffer temp-buffer)) |
641 | ||
642 | temp-file) | |
643 | ||
8fb1a583 | 644 | (jka-compr-run-real-handler 'file-local-copy (list filename))))) |
acd622cc RS |
645 | |
646 | ||
647 | ;;; Support for loading compressed files. | |
648 | (defun jka-compr-load (file &optional noerror nomessage nosuffix) | |
649 | "Documented as original." | |
650 | ||
651 | (let* ((local-copy (jka-compr-file-local-copy file)) | |
652 | (load-file (or local-copy file))) | |
653 | ||
654 | (unwind-protect | |
655 | ||
8fb1a583 RS |
656 | (let (inhibit-file-name-operation |
657 | inhibit-file-name-handlers) | |
acd622cc RS |
658 | (or nomessage |
659 | (message "Loading %s..." file)) | |
660 | ||
9b37d8a9 RS |
661 | (let ((load-force-doc-strings t)) |
662 | (load load-file noerror t t)) | |
acd622cc RS |
663 | |
664 | (or nomessage | |
665 | (message "Loading %s...done." file))) | |
666 | ||
acd622cc RS |
667 | (jka-compr-delete-temp-file local-copy)) |
668 | ||
669 | t)) | |
3068998d RS |
670 | |
671 | (defun jka-compr-byte-compiler-base-file-name (file) | |
672 | (let ((info (jka-compr-get-compression-info file))) | |
673 | (if (and info (jka-compr-info-strip-extension info)) | |
674 | (save-match-data | |
675 | (substring file 0 (string-match (jka-compr-info-regexp info) file))) | |
676 | file))) | |
8fb1a583 RS |
677 | \f |
678 | (put 'write-region 'jka-compr 'jka-compr-write-region) | |
679 | (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents) | |
680 | (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy) | |
681 | (put 'load 'jka-compr 'jka-compr-load) | |
3068998d RS |
682 | (put 'byte-compiler-base-file-name 'jka-compr |
683 | 'jka-compr-byte-compiler-base-file-name) | |
acd622cc | 684 | |
acd622cc | 685 | (defun jka-compr-handler (operation &rest args) |
8fb1a583 RS |
686 | (save-match-data |
687 | (let ((jka-op (get operation 'jka-compr))) | |
688 | (if jka-op | |
689 | (apply jka-op args) | |
690 | (jka-compr-run-real-handler operation args))))) | |
acd622cc | 691 | |
99bee6a4 RS |
692 | ;; If we are given an operation that we don't handle, |
693 | ;; call the Emacs primitive for that operation, | |
694 | ;; and manipulate the inhibit variables | |
695 | ;; to prevent the primitive from calling our handler again. | |
696 | (defun jka-compr-run-real-handler (operation args) | |
697 | (let ((inhibit-file-name-handlers | |
698 | (cons 'jka-compr-handler | |
699 | (and (eq inhibit-file-name-operation operation) | |
700 | inhibit-file-name-handlers))) | |
701 | (inhibit-file-name-operation operation)) | |
702 | (apply operation args))) | |
703 | ||
b6dca218 | 704 | ;;;###autoload(defun auto-compression-mode (&optional arg) |
e5220563 RS |
705 | ;;;###autoload "\ |
706 | ;;;###autoloadToggle automatic file compression and uncompression. | |
b6dca218 RS |
707 | ;;;###autoloadWith prefix argument ARG, turn auto compression on if positive, else off. |
708 | ;;;###autoloadReturns the new status of auto compression (non-nil means on)." | |
e5220563 | 709 | ;;;###autoload (interactive "P") |
b6dca218 RS |
710 | ;;;###autoload (if (not (fboundp 'jka-compr-installed-p)) |
711 | ;;;###autoload (progn | |
712 | ;;;###autoload (require 'jka-compr) | |
713 | ;;;###autoload ;; That turned the mode on, so make it initially off. | |
714 | ;;;###autoload (toggle-auto-compression))) | |
e5220563 | 715 | ;;;###autoload (toggle-auto-compression arg t)) |
b6dca218 | 716 | |
e5220563 | 717 | (defun toggle-auto-compression (&optional arg message) |
61793fbf | 718 | "Toggle automatic file compression and uncompression. |
acd622cc | 719 | With prefix argument ARG, turn auto compression on if positive, else off. |
e5220563 RS |
720 | Returns the new status of auto compression (non-nil means on). |
721 | If the argument MESSAGE is non-nil, it means to print a message | |
722 | saying whether the mode is now on or off." | |
723 | (interactive "P\np") | |
acd622cc RS |
724 | (let* ((installed (jka-compr-installed-p)) |
725 | (flag (if (null arg) | |
726 | (not installed) | |
727 | (or (eq arg t) (listp arg) (and (integerp arg) (> arg 0)))))) | |
728 | ||
729 | (cond | |
730 | ((and flag installed) t) ; already installed | |
731 | ||
732 | ((and (not flag) (not installed)) nil) ; already not installed | |
733 | ||
734 | (flag | |
735 | (jka-compr-install)) | |
736 | ||
737 | (t | |
738 | (jka-compr-uninstall))) | |
739 | ||
740 | ||
e5220563 | 741 | (and message |
acd622cc RS |
742 | (if flag |
743 | (message "Automatic file (de)compression is now ON.") | |
744 | (message "Automatic file (de)compression is now OFF."))) | |
745 | ||
746 | flag)) | |
acd622cc RS |
747 | |
748 | (defun jka-compr-build-file-regexp () | |
749 | (concat | |
750 | "\\(" | |
751 | (mapconcat | |
752 | 'jka-compr-info-regexp | |
753 | jka-compr-compression-info-list | |
754 | "\\)\\|\\(") | |
755 | "\\)")) | |
756 | ||
757 | ||
758 | (defun jka-compr-install () | |
759 | "Install jka-compr. | |
919a07bb RS |
760 | This adds entries to `file-name-handler-alist' and `auto-mode-alist' |
761 | and `inhibit-first-line-modes-suffixes'." | |
acd622cc RS |
762 | |
763 | (setq jka-compr-file-name-handler-entry | |
764 | (cons (jka-compr-build-file-regexp) 'jka-compr-handler)) | |
765 | ||
766 | (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry | |
767 | file-name-handler-alist)) | |
768 | ||
769 | (mapcar | |
770 | (function (lambda (x) | |
469f4e8c RS |
771 | (and (jka-compr-info-strip-extension x) |
772 | ;; Make entries in auto-mode-alist so that modes | |
773 | ;; are chosen right according to the file names | |
774 | ;; sans `.gz'. | |
775 | (setq auto-mode-alist | |
776 | (cons (list (jka-compr-info-regexp x) | |
777 | nil 'jka-compr) | |
778 | auto-mode-alist)) | |
779 | ;; Also add these regexps to | |
780 | ;; inhibit-first-line-modes-suffixes, so that a | |
781 | ;; -*- line in the first file of a compressed tar | |
782 | ;; file doesn't override tar-mode. | |
783 | (setq inhibit-first-line-modes-suffixes | |
784 | (cons (jka-compr-info-regexp x) | |
785 | inhibit-first-line-modes-suffixes))))) | |
74b2c737 RS |
786 | jka-compr-compression-info-list) |
787 | (setq auto-mode-alist | |
788 | (append auto-mode-alist jka-compr-mode-alist-additions))) | |
acd622cc RS |
789 | |
790 | ||
791 | (defun jka-compr-uninstall () | |
792 | "Uninstall jka-compr. | |
99bee6a4 | 793 | This removes the entries in `file-name-handler-alist' and `auto-mode-alist' |
919a07bb RS |
794 | and `inhibit-first-line-modes-suffixes' that were added |
795 | by `jka-compr-installed'." | |
796 | ;; Delete from inhibit-first-line-modes-suffixes | |
797 | ;; what jka-compr-install added. | |
798 | (mapcar | |
799 | (function (lambda (x) | |
800 | (and (jka-compr-info-strip-extension x) | |
801 | (setq inhibit-first-line-modes-suffixes | |
802 | (delete (jka-compr-info-regexp x) | |
803 | inhibit-first-line-modes-suffixes))))) | |
804 | jka-compr-compression-info-list) | |
acd622cc RS |
805 | |
806 | (let* ((fnha (cons nil file-name-handler-alist)) | |
807 | (last fnha)) | |
808 | ||
809 | (while (cdr last) | |
810 | (if (eq (cdr (car (cdr last))) 'jka-compr-handler) | |
811 | (setcdr last (cdr (cdr last))) | |
812 | (setq last (cdr last)))) | |
813 | ||
814 | (setq file-name-handler-alist (cdr fnha))) | |
815 | ||
816 | (let* ((ama (cons nil auto-mode-alist)) | |
817 | (last ama) | |
818 | entry) | |
819 | ||
820 | (while (cdr last) | |
821 | (setq entry (car (cdr last))) | |
74b2c737 RS |
822 | (if (or (member entry jka-compr-mode-alist-additions) |
823 | (and (consp (cdr entry)) | |
824 | (eq (nth 2 entry) 'jka-compr))) | |
acd622cc RS |
825 | (setcdr last (cdr (cdr last))) |
826 | (setq last (cdr last)))) | |
827 | ||
828 | (setq auto-mode-alist (cdr ama)))) | |
829 | ||
830 | ||
831 | (defun jka-compr-installed-p () | |
832 | "Return non-nil if jka-compr is installed. | |
99bee6a4 | 833 | The return value is the entry in `file-name-handler-alist' for jka-compr." |
acd622cc RS |
834 | |
835 | (let ((fnha file-name-handler-alist) | |
836 | (installed nil)) | |
837 | ||
838 | (while (and fnha (not installed)) | |
839 | (and (eq (cdr (car fnha)) 'jka-compr-handler) | |
840 | (setq installed (car fnha))) | |
841 | (setq fnha (cdr fnha))) | |
842 | ||
843 | installed)) | |
844 | ||
845 | ||
846 | ;;; Add the file I/O hook if it does not already exist. | |
847 | ;;; Make sure that jka-compr-file-name-handler-entry is eq to the | |
848 | ;;; entry for jka-compr in file-name-handler-alist. | |
849 | (and (jka-compr-installed-p) | |
850 | (jka-compr-uninstall)) | |
851 | ||
852 | (jka-compr-install) | |
853 | ||
854 | ||
855 | (provide 'jka-compr) | |
856 | ||
857 | ;; jka-compr.el ends here. |