1 ;;; uncompress.el --- auto-decompression hook for visiting .Z files
3 ;; Copyright (C) 1992 Free Software Foundation, Inc.
5 ;; This file is part of GNU Emacs.
7 ;; GNU Emacs is free software; you can redistribute it and/or modify
8 ;; it under the terms of the GNU General Public License as published by
9 ;; the Free Software Foundation; either version 1, or (at your option)
12 ;; GNU Emacs is distributed in the hope that it will be useful,
13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ;; GNU General Public License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GNU Emacs; see the file COPYING. If not, write to
19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
21 ;; When we are about to make a backup file,
22 ;; uncompress the file we visited
23 ;; so that making the backup can work properly.
24 ;; This is used as a write-file-hook.
26 (defun uncompress-backup-file ()
27 (and buffer-file-name make-backup-files
(not buffer-backed-up
)
28 (not (file-exists-p buffer-file-name
))
29 (call-process "uncompress" nil nil nil buffer-file-name
))
32 (or (assoc "\\.Z$" auto-mode-alist
)
34 (cons '("\\.Z$" . uncompress-while-visiting
) auto-mode-alist
)))
36 (defun uncompress-while-visiting ()
37 "Temporary \"major mode\" used for .Z files, to uncompress the contents.
38 It then selects a major mode from the uncompressed file name and contents."
39 (if (and (not (null buffer-file-name
))
40 (string-match "\\.Z$" buffer-file-name
))
41 (set-visited-file-name
42 (substring buffer-file-name
0 (match-beginning 0))))
43 (message "Uncompressing...")
44 (let ((buffer-read-only nil
))
45 (shell-command-on-region (point-min) (point-max) "uncompress" t
))
46 (message "Uncompressing...done")
47 (set-buffer-modified-p nil
)
48 (make-local-variable 'write-file-hooks
)
49 (or (memq 'uncompress-backup-file write-file-hooks
)
50 (setq write-file-hooks
(cons 'uncompress-backup-file write-file-hooks
)))
53 (or (memq 'find-compressed-version find-file-not-found-hooks
)
54 (setq find-file-not-found-hooks
55 (cons 'find-compressed-version find-file-not-found-hooks
)))
57 (defun find-compressed-version ()
58 "Hook to read and uncompress the compressed version of a file."
59 ;; Just pretend we had visited the compressed file,
60 ;; and uncompress-while-visiting will do the rest.
61 (if (file-exists-p (concat buffer-file-name
".Z"))
63 (setq buffer-file-name
(concat buffer-file-name
".Z"))
64 (insert-file-contents buffer-file-name t
)
65 (goto-char (point-min))
69 ;;; uncompress.el ends here