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be010748 RS |
1 | ;;; jka-compr.el --- reading/writing/loading compressed files |
2 | ||
523b128c | 3 | ;; Copyright (C) 1993, 1994, 1995, 1997, 1999, 2000 Free Software Foundation, Inc. |
acd622cc RS |
4 | |
5 | ;; Author: jka@ece.cmu.edu (Jay K. Adams) | |
4228277d | 6 | ;; Maintainer: FSF |
acd622cc RS |
7 | ;; Keywords: data |
8 | ||
f4454a14 RS |
9 | ;; This file is part of GNU Emacs. |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
f4454a14 | 25 | |
acd622cc RS |
26 | ;;; Commentary: |
27 | ||
b578f267 EN |
28 | ;; This package implements low-level support for reading, writing, |
29 | ;; and loading compressed files. It hooks into the low-level file | |
30 | ;; I/O functions (including write-region and insert-file-contents) so | |
31 | ;; that they automatically compress or uncompress a file if the file | |
32 | ;; appears to need it (based on the extension of the file name). | |
33 | ;; Packages like Rmail, VM, GNUS, and Info should be able to work | |
34 | ;; with compressed files without modification. | |
35 | ||
36 | ||
37 | ;; INSTRUCTIONS: | |
38 | ;; | |
39 | ;; To use jka-compr, simply load this package, and edit as usual. | |
40 | ;; Its operation should be transparent to the user (except for | |
41 | ;; messages appearing when a file is being compressed or | |
42 | ;; uncompressed). | |
43 | ;; | |
44 | ;; The variable, jka-compr-compression-info-list can be used to | |
45 | ;; customize jka-compr to work with other compression programs. | |
46 | ;; The default value of this variable allows jka-compr to work with | |
47 | ;; Unix compress and gzip. | |
48 | ;; | |
49 | ;; If you are concerned about the stderr output of gzip and other | |
50 | ;; compression/decompression programs showing up in your buffers, you | |
51 | ;; should set the discard-error flag in the compression-info-list. | |
52 | ;; This will cause the stderr of all programs to be discarded. | |
53 | ;; However, it also causes emacs to call compression/uncompression | |
54 | ;; programs through a shell (which is specified by jka-compr-shell). | |
55 | ;; This may be a drag if, on your system, starting up a shell is | |
56 | ;; slow. | |
57 | ;; | |
58 | ;; If you don't want messages about compressing and decompressing | |
59 | ;; to show up in the echo area, you can set the compress-name and | |
60 | ;; decompress-name fields of the jka-compr-compression-info-list to | |
61 | ;; nil. | |
62 | ||
63 | ||
64 | ;; APPLICATION NOTES: | |
65 | ;; | |
66 | ;; crypt++ | |
67 | ;; jka-compr can coexist with crpyt++ if you take all the decompression | |
68 | ;; entries out of the crypt-encoding-list. Clearly problems will arise if | |
69 | ;; you have two programs trying to compress/decompress files. jka-compr | |
70 | ;; will not "work with" crypt++ in the following sense: you won't be able to | |
71 | ;; decode encrypted compressed files--that is, files that have been | |
72 | ;; compressed then encrypted (in that order). Theoretically, crypt++ and | |
73 | ;; jka-compr could properly handle a file that has been encrypted then | |
74 | ;; compressed, but there is little point in trying to compress an encrypted | |
75 | ;; file. | |
76 | ;; | |
77 | ||
78 | ||
79 | ;; ACKNOWLEDGMENTS | |
80 | ;; | |
81 | ;; jka-compr is a V19 adaptation of jka-compr for V18 of Emacs. Many people | |
82 | ;; have made helpful suggestions, reported bugs, and even fixed bugs in | |
83 | ;; jka-compr. I recall the following people as being particularly helpful. | |
84 | ;; | |
85 | ;; Jean-loup Gailly | |
86 | ;; David Hughes | |
87 | ;; Richard Pieri | |
88 | ;; Daniel Quinlan | |
89 | ;; Chris P. Ross | |
90 | ;; Rick Sladkey | |
91 | ;; | |
92 | ;; Andy Norman's ange-ftp was the inspiration for the original jka-compr for | |
93 | ;; Version 18 of Emacs. | |
94 | ;; | |
95 | ;; After I had made progress on the original jka-compr for V18, I learned of a | |
96 | ;; package written by Kazushi Jam Marukawa, called jam-zcat, that did exactly | |
97 | ;; what I was trying to do. I looked over the jam-zcat source code and | |
98 | ;; probably got some ideas from it. | |
99 | ;; | |
acd622cc RS |
100 | |
101 | ;;; Code: | |
102 | ||
bbf5eb28 RS |
103 | (defgroup compression nil |
104 | "Data compression utilities" | |
105 | :group 'data) | |
106 | ||
107 | (defgroup jka-compr nil | |
108 | "jka-compr customization" | |
109 | :group 'compression) | |
110 | ||
111 | ||
112 | (defcustom jka-compr-shell "sh" | |
acd622cc RS |
113 | "*Shell to be used for calling compression programs. |
114 | The value of this variable only matters if you want to discard the | |
115 | stderr of a compression/decompression program (see the documentation | |
bbf5eb28 RS |
116 | for `jka-compr-compression-info-list')." |
117 | :type 'string | |
118 | :group 'jka-compr) | |
acd622cc | 119 | |
eb915452 RS |
120 | (defvar jka-compr-use-shell |
121 | (not (memq system-type '(ms-dos windows-nt)))) | |
acd622cc RS |
122 | |
123 | ;;; I have this defined so that .Z files are assumed to be in unix | |
060c3cc9 | 124 | ;;; compress format; and .gz files, in gzip format, and .bz2 files in bzip fmt. |
bbf5eb28 | 125 | (defcustom jka-compr-compression-info-list |
acd622cc | 126 | ;;[regexp |
ede9c6a8 RS |
127 | ;; compr-message compr-prog compr-args |
128 | ;; uncomp-message uncomp-prog uncomp-args | |
e073a356 | 129 | ;; can-append auto-mode-flag strip-extension-flag file-magic-bytes] |
094cf604 | 130 | '(["\\.Z\\(~\\|\\.~[0-9]+~\\)?\\'" |
acd622cc RS |
131 | "compressing" "compress" ("-c") |
132 | "uncompressing" "uncompress" ("-c") | |
e073a356 | 133 | nil t "\037\235"] |
df312987 DL |
134 | ;; Formerly, these had an additional arg "-c", but that fails with |
135 | ;; "Version 0.1pl2, 29-Aug-97." (RedHat 5.1 GNU/Linux) and | |
136 | ;; "Version 0.9.0b, 9-Sept-98". | |
060c3cc9 | 137 | ["\\.bz2\\'" |
df312987 DL |
138 | "bzip2ing" "bzip2" nil |
139 | "bunzip2ing" "bzip2" ("-d") | |
e073a356 | 140 | nil t "BZh"] |
74b2c737 RS |
141 | ["\\.tgz\\'" |
142 | "zipping" "gzip" ("-c" "-q") | |
143 | "unzipping" "gzip" ("-c" "-q" "-d") | |
e073a356 | 144 | t nil "\037\213"] |
0166aed1 | 145 | ["\\.g?z\\(~\\|\\.~[0-9]+~\\)?\\'" |
acd622cc RS |
146 | "zipping" "gzip" ("-c" "-q") |
147 | "unzipping" "gzip" ("-c" "-q" "-d") | |
e073a356 | 148 | t t "\037\213"]) |
acd622cc RS |
149 | |
150 | "List of vectors that describe available compression techniques. | |
151 | Each element, which describes a compression technique, is a vector of | |
ede9c6a8 RS |
152 | the form [REGEXP COMPRESS-MSG COMPRESS-PROGRAM COMPRESS-ARGS |
153 | UNCOMPRESS-MSG UNCOMPRESS-PROGRAM UNCOMPRESS-ARGS | |
e073a356 | 154 | APPEND-FLAG STRIP-EXTENSION-FLAG FILE-MAGIC-CHARS], where: |
acd622cc RS |
155 | |
156 | regexp is a regexp that matches filenames that are | |
157 | compressed with this format | |
158 | ||
ede9c6a8 RS |
159 | compress-msg is the message to issue to the user when doing this |
160 | type of compression (nil means no message) | |
161 | ||
acd622cc RS |
162 | compress-program is a program that performs this compression |
163 | ||
164 | compress-args is a list of args to pass to the compress program | |
165 | ||
ede9c6a8 RS |
166 | uncompress-msg is the message to issue to the user when doing this |
167 | type of uncompression (nil means no message) | |
acd622cc RS |
168 | |
169 | uncompress-program is a program that performs this compression | |
170 | ||
171 | uncompress-args is a list of args to pass to the uncompress program | |
172 | ||
173 | append-flag is non-nil if this compression technique can be | |
174 | appended | |
175 | ||
e073a356 | 176 | strip-extension-flag non-nil means strip the regexp from file names |
acd622cc RS |
177 | before attempting to set the mode. |
178 | ||
e073a356 RS |
179 | file-magic-chars is a string of characters that you would find |
180 | at the beginning of a file compressed in this way. | |
181 | ||
8fb1a583 | 182 | Because of the way `call-process' is defined, discarding the stderr output of |
acd622cc | 183 | a program adds the overhead of starting a shell each time the program is |
bbf5eb28 RS |
184 | invoked." |
185 | :type '(repeat (vector regexp | |
186 | (choice :tag "Compress Message" | |
187 | (string :format "%v") | |
188 | (const :tag "No Message" nil)) | |
189 | (string :tag "Compress Program") | |
190 | (repeat :tag "Compress Arguments" string) | |
191 | (choice :tag "Uncompress Message" | |
192 | (string :format "%v") | |
193 | (const :tag "No Message" nil)) | |
194 | (string :tag "Uncompress Program") | |
195 | (repeat :tag "Uncompress Arguments" string) | |
196 | (boolean :tag "Append") | |
197 | (boolean :tag "Auto Mode"))) | |
198 | :group 'jka-compr) | |
acd622cc | 199 | |
74b2c737 RS |
200 | (defvar jka-compr-mode-alist-additions |
201 | (list (cons "\\.tgz\\'" 'tar-mode)) | |
4eec33ae RS |
202 | "A list of pairs to add to `auto-mode-alist' when jka-compr is installed.") |
203 | ||
204 | ;; List of all the elements we actually added to file-coding-system-alist. | |
205 | (defvar jka-compr-added-to-file-coding-system-alist nil) | |
acd622cc | 206 | |
555235e6 RS |
207 | (defvar jka-compr-file-name-handler-entry |
208 | nil | |
209 | "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.") | |
e073a356 RS |
210 | |
211 | (defvar jka-compr-really-do-compress nil | |
212 | "Non-nil in a buffer whose visited file was uncompressed on visiting it.") | |
213 | (put 'jka-compr-really-do-compress 'permanent-local t) | |
555235e6 | 214 | \f |
43a3bdcc | 215 | ;;; Functions for accessing the return value of jka-compr-get-compression-info |
acd622cc RS |
216 | (defun jka-compr-info-regexp (info) (aref info 0)) |
217 | (defun jka-compr-info-compress-message (info) (aref info 1)) | |
218 | (defun jka-compr-info-compress-program (info) (aref info 2)) | |
219 | (defun jka-compr-info-compress-args (info) (aref info 3)) | |
220 | (defun jka-compr-info-uncompress-message (info) (aref info 4)) | |
221 | (defun jka-compr-info-uncompress-program (info) (aref info 5)) | |
222 | (defun jka-compr-info-uncompress-args (info) (aref info 6)) | |
223 | (defun jka-compr-info-can-append (info) (aref info 7)) | |
224 | (defun jka-compr-info-strip-extension (info) (aref info 8)) | |
e073a356 | 225 | (defun jka-compr-info-file-magic-bytes (info) (aref info 9)) |
acd622cc RS |
226 | |
227 | ||
228 | (defun jka-compr-get-compression-info (filename) | |
229 | "Return information about the compression scheme of FILENAME. | |
230 | The determination as to which compression scheme, if any, to use is | |
99bee6a4 | 231 | based on the filename itself and `jka-compr-compression-info-list'." |
acd622cc RS |
232 | (catch 'compression-info |
233 | (let ((case-fold-search nil)) | |
234 | (mapcar | |
235 | (function (lambda (x) | |
236 | (and (string-match (jka-compr-info-regexp x) filename) | |
237 | (throw 'compression-info x)))) | |
238 | jka-compr-compression-info-list) | |
239 | nil))) | |
240 | ||
241 | ||
242 | (put 'compression-error 'error-conditions '(compression-error file-error error)) | |
243 | ||
244 | ||
30c78e11 | 245 | (defvar jka-compr-acceptable-retval-list '(0 2 141)) |
acd622cc RS |
246 | |
247 | ||
248 | (defun jka-compr-error (prog args infile message &optional errfile) | |
249 | ||
250 | (let ((errbuf (get-buffer-create " *jka-compr-error*")) | |
251 | (curbuf (current-buffer))) | |
75e9c107 RS |
252 | (with-current-buffer errbuf |
253 | (widen) (erase-buffer) | |
254 | (insert (format "Error while executing \"%s %s < %s\"\n\n" | |
255 | prog | |
256 | (mapconcat 'identity args " ") | |
257 | infile)) | |
258 | ||
259 | (and errfile | |
260 | (insert-file-contents errfile))) | |
acd622cc RS |
261 | (display-buffer errbuf)) |
262 | ||
75e9c107 RS |
263 | (signal 'compression-error |
264 | (list "Opening input file" (format "error %s" message) infile))) | |
acd622cc RS |
265 | |
266 | ||
267 | (defvar jka-compr-dd-program | |
268 | "/bin/dd") | |
269 | ||
270 | ||
dfe05fac | 271 | (defvar jka-compr-dd-blocksize 256) |
acd622cc RS |
272 | |
273 | ||
274 | (defun jka-compr-partial-uncompress (prog message args infile beg len) | |
275 | "Call program PROG with ARGS args taking input from INFILE. | |
276 | Fourth and fifth args, BEG and LEN, specify which part of the output | |
ee139ed3 | 277 | to keep: LEN chars starting BEG chars from the beginning." |
acd622cc RS |
278 | (let* ((skip (/ beg jka-compr-dd-blocksize)) |
279 | (prefix (- beg (* skip jka-compr-dd-blocksize))) | |
280 | (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize)))) | |
281 | (start (point)) | |
acd622cc RS |
282 | (err-file (jka-compr-make-temp-name)) |
283 | (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null" | |
284 | prog | |
285 | (mapconcat 'identity args " ") | |
286 | err-file | |
287 | jka-compr-dd-program | |
288 | jka-compr-dd-blocksize | |
289 | skip | |
dfe05fac RS |
290 | ;; dd seems to be unreliable about |
291 | ;; providing the last block. So, always | |
292 | ;; read one more than you think you need. | |
293 | (if count (concat "count=" (1+ count)) "")))) | |
acd622cc RS |
294 | |
295 | (unwind-protect | |
296 | (or (memq (call-process jka-compr-shell | |
297 | infile t nil "-c" | |
298 | run-string) | |
299 | jka-compr-acceptable-retval-list) | |
300 | ||
301 | (jka-compr-error prog args infile message err-file)) | |
302 | ||
303 | (jka-compr-delete-temp-file err-file)) | |
304 | ||
ee139ed3 | 305 | ;; Delete the stuff after what we want, if there is any. |
acd622cc | 306 | (and |
dfe05fac | 307 | len |
ee139ed3 | 308 | (< (+ start prefix len) (point)) |
dfe05fac | 309 | (delete-region (+ start prefix len) (point))) |
acd622cc | 310 | |
ee139ed3 | 311 | ;; Delete the stuff before what we want. |
acd622cc RS |
312 | (delete-region start (+ start prefix)))) |
313 | ||
314 | ||
315 | (defun jka-compr-call-process (prog message infile output temp args) | |
316 | (if jka-compr-use-shell | |
317 | ||
a81635fc | 318 | (let ((err-file (jka-compr-make-temp-name)) |
baefb016 | 319 | (coding-system-for-read (or coding-system-for-read 'undecided)) |
70c7850e | 320 | (coding-system-for-write 'no-conversion)) |
a81635fc | 321 | |
acd622cc RS |
322 | (unwind-protect |
323 | ||
324 | (or (memq | |
325 | (call-process jka-compr-shell infile | |
326 | (if (stringp output) nil output) | |
327 | nil | |
328 | "-c" | |
329 | (format "%s %s 2> %s %s" | |
330 | prog | |
331 | (mapconcat 'identity args " ") | |
332 | err-file | |
333 | (if (stringp output) | |
334 | (concat "> " output) | |
335 | ""))) | |
336 | jka-compr-acceptable-retval-list) | |
337 | ||
338 | (jka-compr-error prog args infile message err-file)) | |
339 | ||
340 | (jka-compr-delete-temp-file err-file))) | |
341 | ||
342 | (or (zerop | |
343 | (apply 'call-process | |
344 | prog | |
345 | infile | |
346 | (if (stringp output) temp output) | |
347 | nil | |
348 | args)) | |
349 | (jka-compr-error prog args infile message)) | |
350 | ||
351 | (and (stringp output) | |
75e9c107 | 352 | (with-current-buffer temp |
acd622cc | 353 | (write-region (point-min) (point-max) output) |
75e9c107 | 354 | (erase-buffer))))) |
acd622cc RS |
355 | |
356 | ||
357 | ;;; Support for temp files. Much of this was inspired if not lifted | |
358 | ;;; from ange-ftp. | |
359 | ||
bbf5eb28 | 360 | (defcustom jka-compr-temp-name-template |
11757e2f | 361 | (expand-file-name "jka-com" temporary-file-directory) |
362b539a | 362 | "Prefix added to all temp files created by jka-compr. |
bbf5eb28 RS |
363 | There should be no more than seven characters after the final `/'." |
364 | :type 'string | |
365 | :group 'jka-compr) | |
acd622cc | 366 | |
acd622cc RS |
367 | (defun jka-compr-make-temp-name (&optional local-copy) |
368 | "This routine will return the name of a new file." | |
767d12f2 SM |
369 | (make-temp-file jka-compr-temp-name-template)) |
370 | ||
371 | (defalias 'jka-compr-delete-temp-file 'delete-file) | |
acd622cc RS |
372 | |
373 | ||
374 | (defun jka-compr-write-region (start end file &optional append visit) | |
acd622cc RS |
375 | (let* ((filename (expand-file-name file)) |
376 | (visit-file (if (stringp visit) (expand-file-name visit) filename)) | |
e073a356 RS |
377 | (info (jka-compr-get-compression-info visit-file)) |
378 | (magic (and info (jka-compr-info-file-magic-bytes info)))) | |
379 | ||
380 | ;; If we uncompressed this file when visiting it, | |
381 | ;; then recompress it when writing it | |
382 | ;; even if the contents look compressed already. | |
383 | (if (and jka-compr-really-do-compress | |
384 | (eq start 1) | |
385 | (eq end (1+ (buffer-size)))) | |
386 | (setq magic nil)) | |
387 | ||
388 | (if (and info | |
389 | ;; If the contents to be written out | |
390 | ;; are properly compressed already, | |
391 | ;; don't try to compress them over again. | |
392 | (not (and magic | |
393 | (equal (if (stringp start) | |
394 | (substring start 0 (min (length start) | |
395 | (length magic))) | |
396 | (buffer-substring start | |
397 | (min end | |
398 | (+ start (length magic))))) | |
399 | magic)))) | |
400 | (let ((can-append (jka-compr-info-can-append info)) | |
401 | (compress-program (jka-compr-info-compress-program info)) | |
402 | (compress-message (jka-compr-info-compress-message info)) | |
403 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
404 | (uncompress-message (jka-compr-info-uncompress-message info)) | |
405 | (compress-args (jka-compr-info-compress-args info)) | |
406 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
407 | (base-name (file-name-nondirectory visit-file)) | |
408 | temp-file temp-buffer | |
409 | ;; we need to leave `last-coding-system-used' set to its | |
410 | ;; value after calling write-region the first time, so | |
411 | ;; that `basic-save-buffer' sees the right value. | |
412 | (coding-system-used last-coding-system-used)) | |
413 | ||
414 | (setq temp-buffer (get-buffer-create " *jka-compr-wr-temp*")) | |
415 | (with-current-buffer temp-buffer | |
416 | (widen) (erase-buffer)) | |
417 | ||
418 | (if (and append | |
419 | (not can-append) | |
420 | (file-exists-p filename)) | |
421 | ||
422 | (let* ((local-copy (file-local-copy filename)) | |
423 | (local-file (or local-copy filename))) | |
424 | ||
425 | (setq temp-file local-file)) | |
426 | ||
427 | (setq temp-file (jka-compr-make-temp-name))) | |
428 | ||
429 | (and | |
430 | compress-message | |
431 | (message "%s %s..." compress-message base-name)) | |
432 | ||
433 | (jka-compr-run-real-handler 'write-region | |
434 | (list start end temp-file t 'dont)) | |
435 | ;; save value used by the real write-region | |
436 | (setq coding-system-used last-coding-system-used) | |
437 | ||
438 | ;; Here we must read the output of compress program as is | |
439 | ;; without any code conversion. | |
440 | (let ((coding-system-for-read 'no-conversion)) | |
441 | (jka-compr-call-process compress-program | |
442 | (concat compress-message | |
443 | " " base-name) | |
444 | temp-file | |
445 | temp-buffer | |
446 | nil | |
447 | compress-args)) | |
448 | ||
449 | (with-current-buffer temp-buffer | |
450 | (let ((coding-system-for-write 'no-conversion)) | |
451 | (if (memq system-type '(ms-dos windows-nt)) | |
452 | (setq buffer-file-type t) ) | |
453 | (jka-compr-run-real-handler 'write-region | |
454 | (list (point-min) (point-max) | |
455 | filename | |
456 | (and append can-append) 'dont)) | |
457 | (erase-buffer)) ) | |
458 | ||
459 | (jka-compr-delete-temp-file temp-file) | |
acd622cc | 460 | |
e073a356 RS |
461 | (and |
462 | compress-message | |
463 | (message "%s %s...done" compress-message base-name)) | |
464 | ||
465 | (cond | |
466 | ((eq visit t) | |
467 | (setq buffer-file-name filename) | |
468 | (setq jka-compr-really-do-compress t) | |
469 | (set-visited-file-modtime)) | |
470 | ((stringp visit) | |
471 | (setq buffer-file-name visit) | |
472 | (let ((buffer-file-name filename)) | |
473 | (set-visited-file-modtime)))) | |
474 | ||
475 | (and (or (eq visit t) | |
476 | (eq visit nil) | |
477 | (stringp visit)) | |
478 | (message "Wrote %s" visit-file)) | |
479 | ||
480 | ;; ensure `last-coding-system-used' has an appropriate value | |
481 | (setq last-coding-system-used coding-system-used) | |
482 | ||
483 | nil) | |
acd622cc | 484 | |
e073a356 RS |
485 | (jka-compr-run-real-handler 'write-region |
486 | (list start end filename append visit))))) | |
acd622cc RS |
487 | |
488 | ||
54b2aa5c | 489 | (defun jka-compr-insert-file-contents (file &optional visit beg end replace) |
acd622cc RS |
490 | (barf-if-buffer-read-only) |
491 | ||
492 | (and (or beg end) | |
493 | visit | |
494 | (error "Attempt to visit less than an entire file")) | |
495 | ||
496 | (let* ((filename (expand-file-name file)) | |
497 | (info (jka-compr-get-compression-info filename))) | |
498 | ||
499 | (if info | |
500 | ||
501 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
502 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
503 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
504 | (base-name (file-name-nondirectory filename)) | |
505 | (notfound nil) | |
8fb1a583 RS |
506 | (local-copy |
507 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc | 508 | local-file |
a81635fc | 509 | size start |
4eec33ae RS |
510 | (coding-system-for-read |
511 | (or coding-system-for-read | |
bab00368 RS |
512 | ;; If multibyte characters are disabled, |
513 | ;; don't do that conversion. | |
514 | (and (null enable-multibyte-characters) | |
c352d959 | 515 | (or (auto-coding-alist-lookup |
f8d8f627 | 516 | (jka-compr-byte-compiler-base-file-name file)) |
c352d959 | 517 | 'raw-text)) |
7ec4806e RS |
518 | (let ((coding (find-operation-coding-system |
519 | 'insert-file-contents | |
520 | (jka-compr-byte-compiler-base-file-name file)))) | |
521 | (and (consp coding) (car coding))) | |
4eec33ae | 522 | 'undecided)) ) |
acd622cc RS |
523 | |
524 | (setq local-file (or local-copy filename)) | |
525 | ||
526 | (and | |
527 | visit | |
528 | (setq buffer-file-name filename)) | |
529 | ||
530 | (unwind-protect ; to make sure local-copy gets deleted | |
531 | ||
532 | (progn | |
533 | ||
534 | (and | |
535 | uncompress-message | |
536 | (message "%s %s..." uncompress-message base-name)) | |
537 | ||
538 | (condition-case error-code | |
539 | ||
540 | (progn | |
094cf604 RS |
541 | (if replace |
542 | (goto-char (point-min))) | |
acd622cc RS |
543 | (setq start (point)) |
544 | (if (or beg end) | |
545 | (jka-compr-partial-uncompress uncompress-program | |
546 | (concat uncompress-message | |
547 | " " base-name) | |
548 | uncompress-args | |
549 | local-file | |
550 | (or beg 0) | |
551 | (if (and beg end) | |
552 | (- end beg) | |
553 | end)) | |
ae849784 RS |
554 | ;; If visiting, bind off buffer-file-name so that |
555 | ;; file-locking will not ask whether we should | |
556 | ;; really edit the buffer. | |
557 | (let ((buffer-file-name | |
558 | (if visit nil buffer-file-name))) | |
559 | (jka-compr-call-process uncompress-program | |
560 | (concat uncompress-message | |
561 | " " base-name) | |
562 | local-file | |
563 | t | |
564 | nil | |
565 | uncompress-args))) | |
acd622cc | 566 | (setq size (- (point) start)) |
094cf604 RS |
567 | (if replace |
568 | (let* ((del-beg (point)) | |
569 | (del-end (+ del-beg size))) | |
570 | (delete-region del-beg | |
571 | (min del-end (point-max))))) | |
572 | (goto-char start)) | |
acd622cc RS |
573 | (error |
574 | (if (and (eq (car error-code) 'file-error) | |
575 | (eq (nth 3 error-code) local-file)) | |
576 | (if visit | |
577 | (setq notfound error-code) | |
578 | (signal 'file-error | |
579 | (cons "Opening input file" | |
580 | (nthcdr 2 error-code)))) | |
581 | (signal (car error-code) (cdr error-code)))))) | |
582 | ||
583 | (and | |
584 | local-copy | |
585 | (file-exists-p local-copy) | |
586 | (delete-file local-copy))) | |
587 | ||
588 | (and | |
589 | visit | |
590 | (progn | |
8fb1a583 | 591 | (unlock-buffer) |
acd622cc | 592 | (setq buffer-file-name filename) |
e073a356 | 593 | (setq jka-compr-really-do-compress t) |
acd622cc RS |
594 | (set-visited-file-modtime))) |
595 | ||
596 | (and | |
597 | uncompress-message | |
598 | (message "%s %s...done" uncompress-message base-name)) | |
599 | ||
600 | (and | |
601 | visit | |
602 | notfound | |
603 | (signal 'file-error | |
604 | (cons "Opening input file" (nth 2 notfound)))) | |
605 | ||
5c6f2f2a RS |
606 | ;; This is done in insert-file-contents after we return. |
607 | ;; That is a little weird, but better to go along with it now | |
608 | ;; than to change it now. | |
609 | ||
610 | ;;; ;; Run the functions that insert-file-contents would. | |
611 | ;;; (let ((p after-insert-file-functions) | |
612 | ;;; (insval size)) | |
613 | ;;; (while p | |
614 | ;;; (setq insval (funcall (car p) size)) | |
615 | ;;; (if insval | |
616 | ;;; (progn | |
617 | ;;; (or (integerp insval) | |
618 | ;;; (signal 'wrong-type-argument | |
619 | ;;; (list 'integerp insval))) | |
620 | ;;; (setq size insval))) | |
621 | ;;; (setq p (cdr p)))) | |
094cf604 | 622 | |
acd622cc RS |
623 | (list filename size)) |
624 | ||
8fb1a583 RS |
625 | (jka-compr-run-real-handler 'insert-file-contents |
626 | (list file visit beg end replace))))) | |
acd622cc RS |
627 | |
628 | ||
629 | (defun jka-compr-file-local-copy (file) | |
acd622cc RS |
630 | (let* ((filename (expand-file-name file)) |
631 | (info (jka-compr-get-compression-info filename))) | |
632 | ||
633 | (if info | |
634 | ||
635 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
636 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
637 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
638 | (base-name (file-name-nondirectory filename)) | |
8fb1a583 RS |
639 | (local-copy |
640 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc | 641 | (temp-file (jka-compr-make-temp-name t)) |
30c78e11 | 642 | (temp-buffer (get-buffer-create " *jka-compr-flc-temp*")) |
acd622cc | 643 | (notfound nil) |
acd622cc RS |
644 | local-file) |
645 | ||
646 | (setq local-file (or local-copy filename)) | |
647 | ||
648 | (unwind-protect | |
649 | ||
75e9c107 | 650 | (with-current-buffer temp-buffer |
acd622cc RS |
651 | |
652 | (and | |
653 | uncompress-message | |
654 | (message "%s %s..." uncompress-message base-name)) | |
acd622cc | 655 | |
baefb016 KH |
656 | ;; Here we must read the output of uncompress program |
657 | ;; and write it to TEMP-FILE without any code | |
658 | ;; conversion. An appropriate code conversion (if | |
659 | ;; necessary) is done by the later I/O operation | |
660 | ;; (e.g. load). | |
661 | (let ((coding-system-for-read 'no-conversion) | |
662 | (coding-system-for-write 'no-conversion)) | |
663 | ||
664 | (jka-compr-call-process uncompress-program | |
665 | (concat uncompress-message | |
666 | " " base-name) | |
667 | local-file | |
668 | t | |
669 | nil | |
670 | uncompress-args) | |
671 | ||
672 | (and | |
673 | uncompress-message | |
674 | (message "%s %s...done" uncompress-message base-name)) | |
675 | ||
676 | (write-region | |
677 | (point-min) (point-max) temp-file nil 'dont))) | |
acd622cc RS |
678 | |
679 | (and | |
680 | local-copy | |
681 | (file-exists-p local-copy) | |
682 | (delete-file local-copy)) | |
683 | ||
acd622cc RS |
684 | (kill-buffer temp-buffer)) |
685 | ||
686 | temp-file) | |
687 | ||
8fb1a583 | 688 | (jka-compr-run-real-handler 'file-local-copy (list filename))))) |
acd622cc RS |
689 | |
690 | ||
691 | ;;; Support for loading compressed files. | |
692 | (defun jka-compr-load (file &optional noerror nomessage nosuffix) | |
693 | "Documented as original." | |
694 | ||
695 | (let* ((local-copy (jka-compr-file-local-copy file)) | |
696 | (load-file (or local-copy file))) | |
697 | ||
698 | (unwind-protect | |
699 | ||
8fb1a583 RS |
700 | (let (inhibit-file-name-operation |
701 | inhibit-file-name-handlers) | |
acd622cc RS |
702 | (or nomessage |
703 | (message "Loading %s..." file)) | |
704 | ||
9b37d8a9 RS |
705 | (let ((load-force-doc-strings t)) |
706 | (load load-file noerror t t)) | |
acd622cc | 707 | (or nomessage |
e645e77b DL |
708 | (message "Loading %s...done." file)) |
709 | ;; Fix up the load history to point at the right library. | |
710 | (let ((l (assoc load-file load-history))) | |
711 | ;; Remove .gz and .elc?. | |
712 | (while (file-name-extension file) | |
713 | (setq file (file-name-sans-extension file))) | |
714 | (setcar l file))) | |
acd622cc | 715 | |
acd622cc RS |
716 | (jka-compr-delete-temp-file local-copy)) |
717 | ||
718 | t)) | |
3068998d RS |
719 | |
720 | (defun jka-compr-byte-compiler-base-file-name (file) | |
721 | (let ((info (jka-compr-get-compression-info file))) | |
722 | (if (and info (jka-compr-info-strip-extension info)) | |
723 | (save-match-data | |
724 | (substring file 0 (string-match (jka-compr-info-regexp info) file))) | |
725 | file))) | |
8fb1a583 RS |
726 | \f |
727 | (put 'write-region 'jka-compr 'jka-compr-write-region) | |
728 | (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents) | |
729 | (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy) | |
730 | (put 'load 'jka-compr 'jka-compr-load) | |
3068998d RS |
731 | (put 'byte-compiler-base-file-name 'jka-compr |
732 | 'jka-compr-byte-compiler-base-file-name) | |
acd622cc | 733 | |
9fdf055b KH |
734 | (defvar jka-compr-inhibit nil |
735 | "Non-nil means inhibit automatic uncompression temporarily. | |
736 | Lisp programs can bind this to t to do that. | |
737 | It is not recommended to set this variable permanently to anything but nil.") | |
738 | ||
acd622cc | 739 | (defun jka-compr-handler (operation &rest args) |
8fb1a583 RS |
740 | (save-match-data |
741 | (let ((jka-op (get operation 'jka-compr))) | |
9fdf055b | 742 | (if (and jka-op (not jka-compr-inhibit)) |
8fb1a583 RS |
743 | (apply jka-op args) |
744 | (jka-compr-run-real-handler operation args))))) | |
acd622cc | 745 | |
99bee6a4 RS |
746 | ;; If we are given an operation that we don't handle, |
747 | ;; call the Emacs primitive for that operation, | |
748 | ;; and manipulate the inhibit variables | |
749 | ;; to prevent the primitive from calling our handler again. | |
750 | (defun jka-compr-run-real-handler (operation args) | |
751 | (let ((inhibit-file-name-handlers | |
752 | (cons 'jka-compr-handler | |
753 | (and (eq inhibit-file-name-operation operation) | |
754 | inhibit-file-name-handlers))) | |
755 | (inhibit-file-name-operation operation)) | |
756 | (apply operation args))) | |
757 | ||
9699776c | 758 | ;;;###autoload |
defdd32e | 759 | (define-minor-mode auto-compression-mode |
61793fbf | 760 | "Toggle automatic file compression and uncompression. |
acd622cc | 761 | With prefix argument ARG, turn auto compression on if positive, else off. |
defdd32e SM |
762 | Returns the new status of auto compression (non-nil means on)." |
763 | nil nil nil :global t :group 'jka-compr | |
acd622cc | 764 | (let* ((installed (jka-compr-installed-p)) |
defdd32e | 765 | (flag auto-compression-mode)) |
acd622cc RS |
766 | (cond |
767 | ((and flag installed) t) ; already installed | |
acd622cc | 768 | ((and (not flag) (not installed)) nil) ; already not installed |
defdd32e SM |
769 | (flag (jka-compr-install)) |
770 | (t (jka-compr-uninstall))))) | |
acd622cc | 771 | |
523b128c MB |
772 | |
773 | (defmacro with-auto-compression-mode (&rest body) | |
774 | "Evalutes BODY with automatic file compression and uncompression enabled." | |
775 | (let ((already-installed (make-symbol "already-installed"))) | |
776 | `(let ((,already-installed (jka-compr-installed-p))) | |
777 | (unwind-protect | |
778 | (progn | |
779 | (unless ,already-installed | |
780 | (jka-compr-install)) | |
781 | ,@body) | |
782 | (unless ,already-installed | |
783 | (jka-compr-uninstall)))))) | |
784 | (put 'with-auto-compression-mode 'lisp-indent-function 0) | |
785 | ||
786 | ||
acd622cc | 787 | (defun jka-compr-build-file-regexp () |
defdd32e SM |
788 | (mapconcat |
789 | 'jka-compr-info-regexp | |
790 | jka-compr-compression-info-list | |
791 | "\\|")) | |
acd622cc RS |
792 | |
793 | ||
794 | (defun jka-compr-install () | |
795 | "Install jka-compr. | |
919a07bb RS |
796 | This adds entries to `file-name-handler-alist' and `auto-mode-alist' |
797 | and `inhibit-first-line-modes-suffixes'." | |
acd622cc RS |
798 | |
799 | (setq jka-compr-file-name-handler-entry | |
800 | (cons (jka-compr-build-file-regexp) 'jka-compr-handler)) | |
801 | ||
802 | (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry | |
803 | file-name-handler-alist)) | |
804 | ||
4eec33ae RS |
805 | (setq jka-compr-added-to-file-coding-system-alist nil) |
806 | ||
acd622cc RS |
807 | (mapcar |
808 | (function (lambda (x) | |
4eec33ae RS |
809 | ;; Don't do multibyte encoding on the compressed files. |
810 | (let ((elt (cons (jka-compr-info-regexp x) | |
811 | '(no-conversion . no-conversion)))) | |
812 | (setq file-coding-system-alist | |
813 | (cons elt file-coding-system-alist)) | |
814 | (setq jka-compr-added-to-file-coding-system-alist | |
815 | (cons elt jka-compr-added-to-file-coding-system-alist))) | |
816 | ||
469f4e8c RS |
817 | (and (jka-compr-info-strip-extension x) |
818 | ;; Make entries in auto-mode-alist so that modes | |
819 | ;; are chosen right according to the file names | |
820 | ;; sans `.gz'. | |
821 | (setq auto-mode-alist | |
822 | (cons (list (jka-compr-info-regexp x) | |
823 | nil 'jka-compr) | |
824 | auto-mode-alist)) | |
825 | ;; Also add these regexps to | |
826 | ;; inhibit-first-line-modes-suffixes, so that a | |
827 | ;; -*- line in the first file of a compressed tar | |
828 | ;; file doesn't override tar-mode. | |
829 | (setq inhibit-first-line-modes-suffixes | |
830 | (cons (jka-compr-info-regexp x) | |
831 | inhibit-first-line-modes-suffixes))))) | |
74b2c737 RS |
832 | jka-compr-compression-info-list) |
833 | (setq auto-mode-alist | |
834 | (append auto-mode-alist jka-compr-mode-alist-additions))) | |
acd622cc RS |
835 | |
836 | ||
837 | (defun jka-compr-uninstall () | |
838 | "Uninstall jka-compr. | |
99bee6a4 | 839 | This removes the entries in `file-name-handler-alist' and `auto-mode-alist' |
919a07bb RS |
840 | and `inhibit-first-line-modes-suffixes' that were added |
841 | by `jka-compr-installed'." | |
842 | ;; Delete from inhibit-first-line-modes-suffixes | |
843 | ;; what jka-compr-install added. | |
844 | (mapcar | |
845 | (function (lambda (x) | |
846 | (and (jka-compr-info-strip-extension x) | |
847 | (setq inhibit-first-line-modes-suffixes | |
848 | (delete (jka-compr-info-regexp x) | |
849 | inhibit-first-line-modes-suffixes))))) | |
850 | jka-compr-compression-info-list) | |
acd622cc RS |
851 | |
852 | (let* ((fnha (cons nil file-name-handler-alist)) | |
853 | (last fnha)) | |
854 | ||
855 | (while (cdr last) | |
856 | (if (eq (cdr (car (cdr last))) 'jka-compr-handler) | |
857 | (setcdr last (cdr (cdr last))) | |
858 | (setq last (cdr last)))) | |
859 | ||
860 | (setq file-name-handler-alist (cdr fnha))) | |
861 | ||
862 | (let* ((ama (cons nil auto-mode-alist)) | |
863 | (last ama) | |
864 | entry) | |
865 | ||
866 | (while (cdr last) | |
867 | (setq entry (car (cdr last))) | |
74b2c737 RS |
868 | (if (or (member entry jka-compr-mode-alist-additions) |
869 | (and (consp (cdr entry)) | |
870 | (eq (nth 2 entry) 'jka-compr))) | |
acd622cc RS |
871 | (setcdr last (cdr (cdr last))) |
872 | (setq last (cdr last)))) | |
873 | ||
4eec33ae RS |
874 | (setq auto-mode-alist (cdr ama))) |
875 | ||
876 | (let* ((ama (cons nil file-coding-system-alist)) | |
877 | (last ama) | |
878 | entry) | |
879 | ||
880 | (while (cdr last) | |
881 | (setq entry (car (cdr last))) | |
882 | (if (member entry jka-compr-added-to-file-coding-system-alist) | |
883 | (setcdr last (cdr (cdr last))) | |
884 | (setq last (cdr last)))) | |
885 | ||
886 | (setq file-coding-system-alist (cdr ama)))) | |
acd622cc RS |
887 | |
888 | ||
889 | (defun jka-compr-installed-p () | |
890 | "Return non-nil if jka-compr is installed. | |
99bee6a4 | 891 | The return value is the entry in `file-name-handler-alist' for jka-compr." |
acd622cc RS |
892 | |
893 | (let ((fnha file-name-handler-alist) | |
894 | (installed nil)) | |
895 | ||
896 | (while (and fnha (not installed)) | |
897 | (and (eq (cdr (car fnha)) 'jka-compr-handler) | |
898 | (setq installed (car fnha))) | |
899 | (setq fnha (cdr fnha))) | |
900 | ||
901 | installed)) | |
902 | ||
903 | ||
904 | ;;; Add the file I/O hook if it does not already exist. | |
905 | ;;; Make sure that jka-compr-file-name-handler-entry is eq to the | |
906 | ;;; entry for jka-compr in file-name-handler-alist. | |
907 | (and (jka-compr-installed-p) | |
908 | (jka-compr-uninstall)) | |
909 | ||
910 | (jka-compr-install) | |
911 | ||
912 | ||
913 | (provide 'jka-compr) | |
914 | ||
915 | ;; jka-compr.el ends here. |