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