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1 ;;; uncompress.el --- auto-decompression hook for visiting .Z files
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3 ;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: unix extensions
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; This package can be used to arrange for automatic uncompress of
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30 ;; files packed with the UNIX compress(1) utility when they are visited.
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31 ;; All that's necessary is to load it. This can conveniently be done from
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32 ;; your .emacs file.
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33
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34 ;;; Code:
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35
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36 ;; When we are about to make a backup file,
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37 ;; uncompress the file we visited
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38 ;; so that making the backup can work properly.
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39 ;; This is used as a write-file-hook.
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40
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41 (defvar uncompress-program "gunzip"
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42 "Program to use for uncompression.")
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43
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44 (defun uncompress-backup-file ()
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45 (and buffer-file-name make-backup-files (not buffer-backed-up)
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46 (not (file-exists-p buffer-file-name))
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47 (call-process uncompress-program nil nil nil buffer-file-name))
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48 nil)
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49
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50 (or (assoc "\\.Z$" auto-mode-alist)
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51 (setq auto-mode-alist
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52 (cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
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53 (or (assoc "\\.gz$" auto-mode-alist)
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54 (setq auto-mode-alist
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55 (cons '("\\.gz$" . uncompress-while-visiting) auto-mode-alist)))
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56
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57 (defun uncompress-while-visiting ()
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58 "Temporary \"major mode\" used for .Z and .gz files, to uncompress them.
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59 It then selects a major mode from the uncompressed file name and contents."
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60 (if (and (not (null buffer-file-name))
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61 (string-match "\\.Z$" buffer-file-name))
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62 (set-visited-file-name
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63 (substring buffer-file-name 0 (match-beginning 0)))
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64 (if (and (not (null buffer-file-name))
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65 (string-match "\\.gz$" buffer-file-name))
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66 (set-visited-file-name
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67 (substring buffer-file-name 0 (match-beginning 0)))))
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68 (message "Uncompressing...")
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69 (let ((buffer-read-only nil))
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70 (shell-command-on-region (point-min) (point-max) uncompress-program t))
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71 (message "Uncompressing...done")
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72 (set-buffer-modified-p nil)
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73 (make-local-variable 'write-file-hooks)
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74 (or (memq 'uncompress-backup-file write-file-hooks)
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75 (setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
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76 (normal-mode))
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77
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78 (or (memq 'find-compressed-version find-file-not-found-hooks)
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79 (setq find-file-not-found-hooks
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80 (cons 'find-compressed-version find-file-not-found-hooks)))
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81
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82 (defun find-compressed-version ()
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83 "Hook to read and uncompress the compressed version of a file."
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84 ;; Just pretend we had visited the compressed file,
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85 ;; and uncompress-while-visiting will do the rest.
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86 (let (name)
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87 (if (file-exists-p (setq name (concat buffer-file-name ".Z")))
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88 (setq buffer-file-name name)
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89 (if (file-exists-p (setq name (concat buffer-file-name ".gz")))
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90 (setq buffer-file-name name)))
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91 (if (eq name buffer-file-name)
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92 (progn
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93 (insert-file-contents buffer-file-name t)
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94 (goto-char (point-min))
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95 (setq error nil)
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96 t))))
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97
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98 (provide 'uncompress)
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99
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100 ;;; uncompress.el ends here
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