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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 | |
55535639 | 26 | ;;; Commentary: |
acd622cc | 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 | ;; | |
7391213d MB |
39 | ;; To use jka-compr, invoke the command `auto-compression-mode' (which |
40 | ;; see), or customize the variable of the same name. Its operation | |
41 | ;; should be transparent to the user (except for messages appearing when | |
42 | ;; a file is being compressed or uncompressed). | |
b578f267 EN |
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") | |
a3fdb58a DL |
197 | (boolean :tag "Strip Extension") |
198 | (string :tag "Magic Bytes"))) | |
bbf5eb28 | 199 | :group 'jka-compr) |
acd622cc | 200 | |
74b2c737 RS |
201 | (defvar jka-compr-mode-alist-additions |
202 | (list (cons "\\.tgz\\'" 'tar-mode)) | |
4eec33ae RS |
203 | "A list of pairs to add to `auto-mode-alist' when jka-compr is installed.") |
204 | ||
205 | ;; List of all the elements we actually added to file-coding-system-alist. | |
206 | (defvar jka-compr-added-to-file-coding-system-alist nil) | |
acd622cc | 207 | |
555235e6 RS |
208 | (defvar jka-compr-file-name-handler-entry |
209 | nil | |
210 | "The entry in `file-name-handler-alist' used by the jka-compr I/O functions.") | |
e073a356 RS |
211 | |
212 | (defvar jka-compr-really-do-compress nil | |
213 | "Non-nil in a buffer whose visited file was uncompressed on visiting it.") | |
214 | (put 'jka-compr-really-do-compress 'permanent-local t) | |
555235e6 | 215 | \f |
43a3bdcc | 216 | ;;; Functions for accessing the return value of jka-compr-get-compression-info |
acd622cc RS |
217 | (defun jka-compr-info-regexp (info) (aref info 0)) |
218 | (defun jka-compr-info-compress-message (info) (aref info 1)) | |
219 | (defun jka-compr-info-compress-program (info) (aref info 2)) | |
220 | (defun jka-compr-info-compress-args (info) (aref info 3)) | |
221 | (defun jka-compr-info-uncompress-message (info) (aref info 4)) | |
222 | (defun jka-compr-info-uncompress-program (info) (aref info 5)) | |
223 | (defun jka-compr-info-uncompress-args (info) (aref info 6)) | |
224 | (defun jka-compr-info-can-append (info) (aref info 7)) | |
225 | (defun jka-compr-info-strip-extension (info) (aref info 8)) | |
e073a356 | 226 | (defun jka-compr-info-file-magic-bytes (info) (aref info 9)) |
acd622cc RS |
227 | |
228 | ||
229 | (defun jka-compr-get-compression-info (filename) | |
230 | "Return information about the compression scheme of FILENAME. | |
231 | The determination as to which compression scheme, if any, to use is | |
99bee6a4 | 232 | based on the filename itself and `jka-compr-compression-info-list'." |
acd622cc RS |
233 | (catch 'compression-info |
234 | (let ((case-fold-search nil)) | |
235 | (mapcar | |
236 | (function (lambda (x) | |
237 | (and (string-match (jka-compr-info-regexp x) filename) | |
238 | (throw 'compression-info x)))) | |
239 | jka-compr-compression-info-list) | |
240 | nil))) | |
241 | ||
242 | ||
243 | (put 'compression-error 'error-conditions '(compression-error file-error error)) | |
244 | ||
245 | ||
30c78e11 | 246 | (defvar jka-compr-acceptable-retval-list '(0 2 141)) |
acd622cc RS |
247 | |
248 | ||
249 | (defun jka-compr-error (prog args infile message &optional errfile) | |
250 | ||
251 | (let ((errbuf (get-buffer-create " *jka-compr-error*")) | |
252 | (curbuf (current-buffer))) | |
75e9c107 RS |
253 | (with-current-buffer errbuf |
254 | (widen) (erase-buffer) | |
255 | (insert (format "Error while executing \"%s %s < %s\"\n\n" | |
256 | prog | |
257 | (mapconcat 'identity args " ") | |
258 | infile)) | |
259 | ||
260 | (and errfile | |
261 | (insert-file-contents errfile))) | |
acd622cc RS |
262 | (display-buffer errbuf)) |
263 | ||
75e9c107 RS |
264 | (signal 'compression-error |
265 | (list "Opening input file" (format "error %s" message) infile))) | |
acd622cc RS |
266 | |
267 | ||
268 | (defvar jka-compr-dd-program | |
269 | "/bin/dd") | |
270 | ||
271 | ||
dfe05fac | 272 | (defvar jka-compr-dd-blocksize 256) |
acd622cc RS |
273 | |
274 | ||
275 | (defun jka-compr-partial-uncompress (prog message args infile beg len) | |
276 | "Call program PROG with ARGS args taking input from INFILE. | |
277 | Fourth and fifth args, BEG and LEN, specify which part of the output | |
ee139ed3 | 278 | to keep: LEN chars starting BEG chars from the beginning." |
acd622cc RS |
279 | (let* ((skip (/ beg jka-compr-dd-blocksize)) |
280 | (prefix (- beg (* skip jka-compr-dd-blocksize))) | |
281 | (count (and len (1+ (/ (+ len prefix) jka-compr-dd-blocksize)))) | |
282 | (start (point)) | |
acd622cc RS |
283 | (err-file (jka-compr-make-temp-name)) |
284 | (run-string (format "%s %s 2> %s | %s bs=%d skip=%d %s 2> /dev/null" | |
285 | prog | |
286 | (mapconcat 'identity args " ") | |
287 | err-file | |
288 | jka-compr-dd-program | |
289 | jka-compr-dd-blocksize | |
290 | skip | |
dfe05fac RS |
291 | ;; dd seems to be unreliable about |
292 | ;; providing the last block. So, always | |
293 | ;; read one more than you think you need. | |
ee753ec8 | 294 | (if count (format "count=%d" (1+ count)) "")))) |
acd622cc RS |
295 | |
296 | (unwind-protect | |
297 | (or (memq (call-process jka-compr-shell | |
298 | infile t nil "-c" | |
299 | run-string) | |
300 | jka-compr-acceptable-retval-list) | |
301 | ||
302 | (jka-compr-error prog args infile message err-file)) | |
303 | ||
304 | (jka-compr-delete-temp-file err-file)) | |
305 | ||
ee139ed3 | 306 | ;; Delete the stuff after what we want, if there is any. |
acd622cc | 307 | (and |
dfe05fac | 308 | len |
ee139ed3 | 309 | (< (+ start prefix len) (point)) |
dfe05fac | 310 | (delete-region (+ start prefix len) (point))) |
acd622cc | 311 | |
ee139ed3 | 312 | ;; Delete the stuff before what we want. |
acd622cc RS |
313 | (delete-region start (+ start prefix)))) |
314 | ||
315 | ||
316 | (defun jka-compr-call-process (prog message infile output temp args) | |
317 | (if jka-compr-use-shell | |
318 | ||
a81635fc | 319 | (let ((err-file (jka-compr-make-temp-name)) |
baefb016 | 320 | (coding-system-for-read (or coding-system-for-read 'undecided)) |
70c7850e | 321 | (coding-system-for-write 'no-conversion)) |
a81635fc | 322 | |
acd622cc RS |
323 | (unwind-protect |
324 | ||
325 | (or (memq | |
326 | (call-process jka-compr-shell infile | |
327 | (if (stringp output) nil output) | |
328 | nil | |
329 | "-c" | |
330 | (format "%s %s 2> %s %s" | |
331 | prog | |
332 | (mapconcat 'identity args " ") | |
333 | err-file | |
334 | (if (stringp output) | |
335 | (concat "> " output) | |
336 | ""))) | |
337 | jka-compr-acceptable-retval-list) | |
338 | ||
339 | (jka-compr-error prog args infile message err-file)) | |
340 | ||
341 | (jka-compr-delete-temp-file err-file))) | |
342 | ||
343 | (or (zerop | |
344 | (apply 'call-process | |
345 | prog | |
346 | infile | |
347 | (if (stringp output) temp output) | |
348 | nil | |
349 | args)) | |
350 | (jka-compr-error prog args infile message)) | |
351 | ||
352 | (and (stringp output) | |
75e9c107 | 353 | (with-current-buffer temp |
acd622cc | 354 | (write-region (point-min) (point-max) output) |
75e9c107 | 355 | (erase-buffer))))) |
acd622cc RS |
356 | |
357 | ||
358 | ;;; Support for temp files. Much of this was inspired if not lifted | |
359 | ;;; from ange-ftp. | |
360 | ||
bbf5eb28 | 361 | (defcustom jka-compr-temp-name-template |
11757e2f | 362 | (expand-file-name "jka-com" temporary-file-directory) |
362b539a | 363 | "Prefix added to all temp files created by jka-compr. |
bbf5eb28 RS |
364 | There should be no more than seven characters after the final `/'." |
365 | :type 'string | |
366 | :group 'jka-compr) | |
acd622cc | 367 | |
acd622cc RS |
368 | (defun jka-compr-make-temp-name (&optional local-copy) |
369 | "This routine will return the name of a new file." | |
767d12f2 SM |
370 | (make-temp-file jka-compr-temp-name-template)) |
371 | ||
372 | (defalias 'jka-compr-delete-temp-file 'delete-file) | |
acd622cc RS |
373 | |
374 | ||
375 | (defun jka-compr-write-region (start end file &optional append visit) | |
acd622cc RS |
376 | (let* ((filename (expand-file-name file)) |
377 | (visit-file (if (stringp visit) (expand-file-name visit) filename)) | |
e073a356 RS |
378 | (info (jka-compr-get-compression-info visit-file)) |
379 | (magic (and info (jka-compr-info-file-magic-bytes info)))) | |
380 | ||
381 | ;; If we uncompressed this file when visiting it, | |
382 | ;; then recompress it when writing it | |
383 | ;; even if the contents look compressed already. | |
384 | (if (and jka-compr-really-do-compress | |
385 | (eq start 1) | |
386 | (eq end (1+ (buffer-size)))) | |
387 | (setq magic nil)) | |
388 | ||
389 | (if (and info | |
390 | ;; If the contents to be written out | |
391 | ;; are properly compressed already, | |
392 | ;; don't try to compress them over again. | |
393 | (not (and magic | |
394 | (equal (if (stringp start) | |
395 | (substring start 0 (min (length start) | |
396 | (length magic))) | |
397 | (buffer-substring start | |
398 | (min end | |
399 | (+ start (length magic))))) | |
400 | magic)))) | |
401 | (let ((can-append (jka-compr-info-can-append info)) | |
402 | (compress-program (jka-compr-info-compress-program info)) | |
403 | (compress-message (jka-compr-info-compress-message info)) | |
404 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
405 | (uncompress-message (jka-compr-info-uncompress-message info)) | |
406 | (compress-args (jka-compr-info-compress-args info)) | |
407 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
408 | (base-name (file-name-nondirectory visit-file)) | |
409 | temp-file temp-buffer | |
410 | ;; we need to leave `last-coding-system-used' set to its | |
411 | ;; value after calling write-region the first time, so | |
412 | ;; that `basic-save-buffer' sees the right value. | |
413 | (coding-system-used last-coding-system-used)) | |
414 | ||
415 | (setq temp-buffer (get-buffer-create " *jka-compr-wr-temp*")) | |
416 | (with-current-buffer temp-buffer | |
417 | (widen) (erase-buffer)) | |
418 | ||
419 | (if (and append | |
420 | (not can-append) | |
421 | (file-exists-p filename)) | |
422 | ||
423 | (let* ((local-copy (file-local-copy filename)) | |
424 | (local-file (or local-copy filename))) | |
425 | ||
426 | (setq temp-file local-file)) | |
427 | ||
428 | (setq temp-file (jka-compr-make-temp-name))) | |
429 | ||
430 | (and | |
431 | compress-message | |
432 | (message "%s %s..." compress-message base-name)) | |
433 | ||
434 | (jka-compr-run-real-handler 'write-region | |
435 | (list start end temp-file t 'dont)) | |
436 | ;; save value used by the real write-region | |
437 | (setq coding-system-used last-coding-system-used) | |
438 | ||
439 | ;; Here we must read the output of compress program as is | |
440 | ;; without any code conversion. | |
441 | (let ((coding-system-for-read 'no-conversion)) | |
442 | (jka-compr-call-process compress-program | |
443 | (concat compress-message | |
444 | " " base-name) | |
445 | temp-file | |
446 | temp-buffer | |
447 | nil | |
448 | compress-args)) | |
449 | ||
450 | (with-current-buffer temp-buffer | |
451 | (let ((coding-system-for-write 'no-conversion)) | |
452 | (if (memq system-type '(ms-dos windows-nt)) | |
453 | (setq buffer-file-type t) ) | |
454 | (jka-compr-run-real-handler 'write-region | |
455 | (list (point-min) (point-max) | |
456 | filename | |
457 | (and append can-append) 'dont)) | |
458 | (erase-buffer)) ) | |
459 | ||
460 | (jka-compr-delete-temp-file temp-file) | |
acd622cc | 461 | |
e073a356 RS |
462 | (and |
463 | compress-message | |
464 | (message "%s %s...done" compress-message base-name)) | |
465 | ||
466 | (cond | |
467 | ((eq visit t) | |
468 | (setq buffer-file-name filename) | |
469 | (setq jka-compr-really-do-compress t) | |
470 | (set-visited-file-modtime)) | |
471 | ((stringp visit) | |
472 | (setq buffer-file-name visit) | |
473 | (let ((buffer-file-name filename)) | |
474 | (set-visited-file-modtime)))) | |
475 | ||
476 | (and (or (eq visit t) | |
477 | (eq visit nil) | |
478 | (stringp visit)) | |
479 | (message "Wrote %s" visit-file)) | |
480 | ||
481 | ;; ensure `last-coding-system-used' has an appropriate value | |
482 | (setq last-coding-system-used coding-system-used) | |
483 | ||
484 | nil) | |
acd622cc | 485 | |
e073a356 RS |
486 | (jka-compr-run-real-handler 'write-region |
487 | (list start end filename append visit))))) | |
acd622cc RS |
488 | |
489 | ||
54b2aa5c | 490 | (defun jka-compr-insert-file-contents (file &optional visit beg end replace) |
acd622cc RS |
491 | (barf-if-buffer-read-only) |
492 | ||
493 | (and (or beg end) | |
494 | visit | |
495 | (error "Attempt to visit less than an entire file")) | |
496 | ||
497 | (let* ((filename (expand-file-name file)) | |
498 | (info (jka-compr-get-compression-info filename))) | |
499 | ||
500 | (if info | |
501 | ||
502 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
503 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
504 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
505 | (base-name (file-name-nondirectory filename)) | |
506 | (notfound nil) | |
8fb1a583 RS |
507 | (local-copy |
508 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc | 509 | local-file |
a81635fc | 510 | size start |
4eec33ae RS |
511 | (coding-system-for-read |
512 | (or coding-system-for-read | |
bab00368 RS |
513 | ;; If multibyte characters are disabled, |
514 | ;; don't do that conversion. | |
515 | (and (null enable-multibyte-characters) | |
c352d959 | 516 | (or (auto-coding-alist-lookup |
f8d8f627 | 517 | (jka-compr-byte-compiler-base-file-name file)) |
c352d959 | 518 | 'raw-text)) |
7ec4806e RS |
519 | (let ((coding (find-operation-coding-system |
520 | 'insert-file-contents | |
521 | (jka-compr-byte-compiler-base-file-name file)))) | |
522 | (and (consp coding) (car coding))) | |
4eec33ae | 523 | 'undecided)) ) |
acd622cc RS |
524 | |
525 | (setq local-file (or local-copy filename)) | |
526 | ||
527 | (and | |
528 | visit | |
529 | (setq buffer-file-name filename)) | |
530 | ||
531 | (unwind-protect ; to make sure local-copy gets deleted | |
532 | ||
533 | (progn | |
534 | ||
535 | (and | |
536 | uncompress-message | |
537 | (message "%s %s..." uncompress-message base-name)) | |
538 | ||
539 | (condition-case error-code | |
540 | ||
541 | (progn | |
094cf604 RS |
542 | (if replace |
543 | (goto-char (point-min))) | |
acd622cc RS |
544 | (setq start (point)) |
545 | (if (or beg end) | |
546 | (jka-compr-partial-uncompress uncompress-program | |
547 | (concat uncompress-message | |
548 | " " base-name) | |
549 | uncompress-args | |
550 | local-file | |
551 | (or beg 0) | |
552 | (if (and beg end) | |
553 | (- end beg) | |
554 | end)) | |
ae849784 RS |
555 | ;; If visiting, bind off buffer-file-name so that |
556 | ;; file-locking will not ask whether we should | |
557 | ;; really edit the buffer. | |
558 | (let ((buffer-file-name | |
559 | (if visit nil buffer-file-name))) | |
560 | (jka-compr-call-process uncompress-program | |
561 | (concat uncompress-message | |
562 | " " base-name) | |
563 | local-file | |
564 | t | |
565 | nil | |
566 | uncompress-args))) | |
acd622cc | 567 | (setq size (- (point) start)) |
094cf604 RS |
568 | (if replace |
569 | (let* ((del-beg (point)) | |
570 | (del-end (+ del-beg size))) | |
571 | (delete-region del-beg | |
572 | (min del-end (point-max))))) | |
573 | (goto-char start)) | |
acd622cc RS |
574 | (error |
575 | (if (and (eq (car error-code) 'file-error) | |
576 | (eq (nth 3 error-code) local-file)) | |
577 | (if visit | |
578 | (setq notfound error-code) | |
579 | (signal 'file-error | |
580 | (cons "Opening input file" | |
581 | (nthcdr 2 error-code)))) | |
582 | (signal (car error-code) (cdr error-code)))))) | |
583 | ||
584 | (and | |
585 | local-copy | |
586 | (file-exists-p local-copy) | |
587 | (delete-file local-copy))) | |
588 | ||
589 | (and | |
590 | visit | |
591 | (progn | |
8fb1a583 | 592 | (unlock-buffer) |
acd622cc | 593 | (setq buffer-file-name filename) |
e073a356 | 594 | (setq jka-compr-really-do-compress t) |
acd622cc RS |
595 | (set-visited-file-modtime))) |
596 | ||
597 | (and | |
598 | uncompress-message | |
599 | (message "%s %s...done" uncompress-message base-name)) | |
600 | ||
601 | (and | |
602 | visit | |
603 | notfound | |
604 | (signal 'file-error | |
605 | (cons "Opening input file" (nth 2 notfound)))) | |
606 | ||
5c6f2f2a RS |
607 | ;; This is done in insert-file-contents after we return. |
608 | ;; That is a little weird, but better to go along with it now | |
609 | ;; than to change it now. | |
610 | ||
611 | ;;; ;; Run the functions that insert-file-contents would. | |
612 | ;;; (let ((p after-insert-file-functions) | |
613 | ;;; (insval size)) | |
614 | ;;; (while p | |
615 | ;;; (setq insval (funcall (car p) size)) | |
616 | ;;; (if insval | |
617 | ;;; (progn | |
618 | ;;; (or (integerp insval) | |
619 | ;;; (signal 'wrong-type-argument | |
620 | ;;; (list 'integerp insval))) | |
621 | ;;; (setq size insval))) | |
622 | ;;; (setq p (cdr p)))) | |
094cf604 | 623 | |
acd622cc RS |
624 | (list filename size)) |
625 | ||
8fb1a583 RS |
626 | (jka-compr-run-real-handler 'insert-file-contents |
627 | (list file visit beg end replace))))) | |
acd622cc RS |
628 | |
629 | ||
630 | (defun jka-compr-file-local-copy (file) | |
acd622cc RS |
631 | (let* ((filename (expand-file-name file)) |
632 | (info (jka-compr-get-compression-info filename))) | |
633 | ||
634 | (if info | |
635 | ||
636 | (let ((uncompress-message (jka-compr-info-uncompress-message info)) | |
637 | (uncompress-program (jka-compr-info-uncompress-program info)) | |
638 | (uncompress-args (jka-compr-info-uncompress-args info)) | |
639 | (base-name (file-name-nondirectory filename)) | |
8fb1a583 RS |
640 | (local-copy |
641 | (jka-compr-run-real-handler 'file-local-copy (list filename))) | |
acd622cc | 642 | (temp-file (jka-compr-make-temp-name t)) |
30c78e11 | 643 | (temp-buffer (get-buffer-create " *jka-compr-flc-temp*")) |
acd622cc | 644 | (notfound nil) |
acd622cc RS |
645 | local-file) |
646 | ||
647 | (setq local-file (or local-copy filename)) | |
648 | ||
649 | (unwind-protect | |
650 | ||
75e9c107 | 651 | (with-current-buffer temp-buffer |
acd622cc RS |
652 | |
653 | (and | |
654 | uncompress-message | |
655 | (message "%s %s..." uncompress-message base-name)) | |
acd622cc | 656 | |
baefb016 KH |
657 | ;; Here we must read the output of uncompress program |
658 | ;; and write it to TEMP-FILE without any code | |
659 | ;; conversion. An appropriate code conversion (if | |
660 | ;; necessary) is done by the later I/O operation | |
661 | ;; (e.g. load). | |
662 | (let ((coding-system-for-read 'no-conversion) | |
663 | (coding-system-for-write 'no-conversion)) | |
664 | ||
665 | (jka-compr-call-process uncompress-program | |
666 | (concat uncompress-message | |
667 | " " base-name) | |
668 | local-file | |
669 | t | |
670 | nil | |
671 | uncompress-args) | |
672 | ||
673 | (and | |
674 | uncompress-message | |
675 | (message "%s %s...done" uncompress-message base-name)) | |
676 | ||
677 | (write-region | |
678 | (point-min) (point-max) temp-file nil 'dont))) | |
acd622cc RS |
679 | |
680 | (and | |
681 | local-copy | |
682 | (file-exists-p local-copy) | |
683 | (delete-file local-copy)) | |
684 | ||
acd622cc RS |
685 | (kill-buffer temp-buffer)) |
686 | ||
687 | temp-file) | |
688 | ||
8fb1a583 | 689 | (jka-compr-run-real-handler 'file-local-copy (list filename))))) |
acd622cc RS |
690 | |
691 | ||
692 | ;;; Support for loading compressed files. | |
693 | (defun jka-compr-load (file &optional noerror nomessage nosuffix) | |
694 | "Documented as original." | |
695 | ||
696 | (let* ((local-copy (jka-compr-file-local-copy file)) | |
697 | (load-file (or local-copy file))) | |
698 | ||
699 | (unwind-protect | |
700 | ||
8fb1a583 RS |
701 | (let (inhibit-file-name-operation |
702 | inhibit-file-name-handlers) | |
acd622cc RS |
703 | (or nomessage |
704 | (message "Loading %s..." file)) | |
705 | ||
9b37d8a9 RS |
706 | (let ((load-force-doc-strings t)) |
707 | (load load-file noerror t t)) | |
acd622cc | 708 | (or nomessage |
e645e77b DL |
709 | (message "Loading %s...done." file)) |
710 | ;; Fix up the load history to point at the right library. | |
711 | (let ((l (assoc load-file load-history))) | |
712 | ;; Remove .gz and .elc?. | |
713 | (while (file-name-extension file) | |
714 | (setq file (file-name-sans-extension file))) | |
715 | (setcar l file))) | |
acd622cc | 716 | |
acd622cc RS |
717 | (jka-compr-delete-temp-file local-copy)) |
718 | ||
719 | t)) | |
3068998d RS |
720 | |
721 | (defun jka-compr-byte-compiler-base-file-name (file) | |
722 | (let ((info (jka-compr-get-compression-info file))) | |
723 | (if (and info (jka-compr-info-strip-extension info)) | |
724 | (save-match-data | |
725 | (substring file 0 (string-match (jka-compr-info-regexp info) file))) | |
726 | file))) | |
8fb1a583 RS |
727 | \f |
728 | (put 'write-region 'jka-compr 'jka-compr-write-region) | |
729 | (put 'insert-file-contents 'jka-compr 'jka-compr-insert-file-contents) | |
730 | (put 'file-local-copy 'jka-compr 'jka-compr-file-local-copy) | |
731 | (put 'load 'jka-compr 'jka-compr-load) | |
3068998d RS |
732 | (put 'byte-compiler-base-file-name 'jka-compr |
733 | 'jka-compr-byte-compiler-base-file-name) | |
acd622cc | 734 | |
9fdf055b KH |
735 | (defvar jka-compr-inhibit nil |
736 | "Non-nil means inhibit automatic uncompression temporarily. | |
737 | Lisp programs can bind this to t to do that. | |
738 | It is not recommended to set this variable permanently to anything but nil.") | |
739 | ||
acd622cc | 740 | (defun jka-compr-handler (operation &rest args) |
8fb1a583 RS |
741 | (save-match-data |
742 | (let ((jka-op (get operation 'jka-compr))) | |
9fdf055b | 743 | (if (and jka-op (not jka-compr-inhibit)) |
8fb1a583 RS |
744 | (apply jka-op args) |
745 | (jka-compr-run-real-handler operation args))))) | |
acd622cc | 746 | |
99bee6a4 RS |
747 | ;; If we are given an operation that we don't handle, |
748 | ;; call the Emacs primitive for that operation, | |
749 | ;; and manipulate the inhibit variables | |
750 | ;; to prevent the primitive from calling our handler again. | |
751 | (defun jka-compr-run-real-handler (operation args) | |
752 | (let ((inhibit-file-name-handlers | |
753 | (cons 'jka-compr-handler | |
754 | (and (eq inhibit-file-name-operation operation) | |
755 | inhibit-file-name-handlers))) | |
756 | (inhibit-file-name-operation operation)) | |
757 | (apply operation args))) | |
758 | ||
523b128c | 759 | |
acd622cc | 760 | (defun jka-compr-build-file-regexp () |
defdd32e SM |
761 | (mapconcat |
762 | 'jka-compr-info-regexp | |
763 | jka-compr-compression-info-list | |
764 | "\\|")) | |
acd622cc RS |
765 | |
766 | ||
767 | (defun jka-compr-install () | |
768 | "Install jka-compr. | |
919a07bb RS |
769 | This adds entries to `file-name-handler-alist' and `auto-mode-alist' |
770 | and `inhibit-first-line-modes-suffixes'." | |
acd622cc RS |
771 | |
772 | (setq jka-compr-file-name-handler-entry | |
773 | (cons (jka-compr-build-file-regexp) 'jka-compr-handler)) | |
774 | ||
775 | (setq file-name-handler-alist (cons jka-compr-file-name-handler-entry | |
776 | file-name-handler-alist)) | |
777 | ||
4eec33ae RS |
778 | (setq jka-compr-added-to-file-coding-system-alist nil) |
779 | ||
acd622cc RS |
780 | (mapcar |
781 | (function (lambda (x) | |
4eec33ae RS |
782 | ;; Don't do multibyte encoding on the compressed files. |
783 | (let ((elt (cons (jka-compr-info-regexp x) | |
784 | '(no-conversion . no-conversion)))) | |
785 | (setq file-coding-system-alist | |
786 | (cons elt file-coding-system-alist)) | |
787 | (setq jka-compr-added-to-file-coding-system-alist | |
788 | (cons elt jka-compr-added-to-file-coding-system-alist))) | |
789 | ||
469f4e8c RS |
790 | (and (jka-compr-info-strip-extension x) |
791 | ;; Make entries in auto-mode-alist so that modes | |
792 | ;; are chosen right according to the file names | |
793 | ;; sans `.gz'. | |
794 | (setq auto-mode-alist | |
795 | (cons (list (jka-compr-info-regexp x) | |
796 | nil 'jka-compr) | |
797 | auto-mode-alist)) | |
798 | ;; Also add these regexps to | |
799 | ;; inhibit-first-line-modes-suffixes, so that a | |
800 | ;; -*- line in the first file of a compressed tar | |
801 | ;; file doesn't override tar-mode. | |
802 | (setq inhibit-first-line-modes-suffixes | |
803 | (cons (jka-compr-info-regexp x) | |
804 | inhibit-first-line-modes-suffixes))))) | |
74b2c737 RS |
805 | jka-compr-compression-info-list) |
806 | (setq auto-mode-alist | |
807 | (append auto-mode-alist jka-compr-mode-alist-additions))) | |
acd622cc RS |
808 | |
809 | ||
810 | (defun jka-compr-uninstall () | |
811 | "Uninstall jka-compr. | |
99bee6a4 | 812 | This removes the entries in `file-name-handler-alist' and `auto-mode-alist' |
919a07bb RS |
813 | and `inhibit-first-line-modes-suffixes' that were added |
814 | by `jka-compr-installed'." | |
815 | ;; Delete from inhibit-first-line-modes-suffixes | |
816 | ;; what jka-compr-install added. | |
817 | (mapcar | |
818 | (function (lambda (x) | |
819 | (and (jka-compr-info-strip-extension x) | |
820 | (setq inhibit-first-line-modes-suffixes | |
821 | (delete (jka-compr-info-regexp x) | |
822 | inhibit-first-line-modes-suffixes))))) | |
823 | jka-compr-compression-info-list) | |
acd622cc RS |
824 | |
825 | (let* ((fnha (cons nil file-name-handler-alist)) | |
826 | (last fnha)) | |
827 | ||
828 | (while (cdr last) | |
829 | (if (eq (cdr (car (cdr last))) 'jka-compr-handler) | |
830 | (setcdr last (cdr (cdr last))) | |
831 | (setq last (cdr last)))) | |
832 | ||
833 | (setq file-name-handler-alist (cdr fnha))) | |
834 | ||
835 | (let* ((ama (cons nil auto-mode-alist)) | |
836 | (last ama) | |
837 | entry) | |
838 | ||
839 | (while (cdr last) | |
840 | (setq entry (car (cdr last))) | |
74b2c737 RS |
841 | (if (or (member entry jka-compr-mode-alist-additions) |
842 | (and (consp (cdr entry)) | |
843 | (eq (nth 2 entry) 'jka-compr))) | |
acd622cc RS |
844 | (setcdr last (cdr (cdr last))) |
845 | (setq last (cdr last)))) | |
846 | ||
4eec33ae RS |
847 | (setq auto-mode-alist (cdr ama))) |
848 | ||
849 | (let* ((ama (cons nil file-coding-system-alist)) | |
850 | (last ama) | |
851 | entry) | |
852 | ||
853 | (while (cdr last) | |
854 | (setq entry (car (cdr last))) | |
855 | (if (member entry jka-compr-added-to-file-coding-system-alist) | |
856 | (setcdr last (cdr (cdr last))) | |
857 | (setq last (cdr last)))) | |
858 | ||
859 | (setq file-coding-system-alist (cdr ama)))) | |
acd622cc RS |
860 | |
861 | ||
862 | (defun jka-compr-installed-p () | |
863 | "Return non-nil if jka-compr is installed. | |
99bee6a4 | 864 | The return value is the entry in `file-name-handler-alist' for jka-compr." |
acd622cc RS |
865 | |
866 | (let ((fnha file-name-handler-alist) | |
867 | (installed nil)) | |
868 | ||
869 | (while (and fnha (not installed)) | |
870 | (and (eq (cdr (car fnha)) 'jka-compr-handler) | |
871 | (setq installed (car fnha))) | |
872 | (setq fnha (cdr fnha))) | |
873 | ||
874 | installed)) | |
875 | ||
876 | ||
7dbc9c8a MB |
877 | ;;; Add the file I/O hook if it does not already exist. |
878 | ;;; Make sure that jka-compr-file-name-handler-entry is eq to the | |
879 | ;;; entry for jka-compr in file-name-handler-alist. | |
880 | (and (jka-compr-installed-p) | |
881 | (jka-compr-uninstall)) | |
882 | ||
883 | ||
884 | ;;; Note this definition must be at the end of the file, because | |
885 | ;;; `define-minor-mode' actually calls the mode-function if the | |
886 | ;;; associated variable is non-nil, which requires that all needed | |
887 | ;;; functions be already defined. [This is arguably a bug in d-m-m] | |
6fee86a3 MB |
888 | ;;;###autoload |
889 | (define-minor-mode auto-compression-mode | |
890 | "Toggle automatic file compression and uncompression. | |
891 | With prefix argument ARG, turn auto compression on if positive, else off. | |
892 | Returns the new status of auto compression (non-nil means on)." | |
754005f7 | 893 | :global t :group 'jka-compr |
6fee86a3 MB |
894 | (let* ((installed (jka-compr-installed-p)) |
895 | (flag auto-compression-mode)) | |
896 | (cond | |
897 | ((and flag installed) t) ; already installed | |
898 | ((and (not flag) (not installed)) nil) ; already not installed | |
899 | (flag (jka-compr-install)) | |
900 | (t (jka-compr-uninstall))))) | |
901 | ||
902 | ||
903 | ;;;###autoload | |
904 | (defmacro with-auto-compression-mode (&rest body) | |
7dbc9c8a | 905 | "Evalute BODY with automatic file compression and uncompression enabled." |
6fee86a3 MB |
906 | (let ((already-installed (make-symbol "already-installed"))) |
907 | `(let ((,already-installed (jka-compr-installed-p))) | |
908 | (unwind-protect | |
909 | (progn | |
910 | (unless ,already-installed | |
911 | (jka-compr-install)) | |
912 | ,@body) | |
913 | (unless ,already-installed | |
914 | (jka-compr-uninstall)))))) | |
915 | (put 'with-auto-compression-mode 'lisp-indent-function 0) | |
916 | ||
917 | ||
acd622cc RS |
918 | (provide 'jka-compr) |
919 | ||
55535639 | 920 | ;;; jka-compr.el ends here |