home *** CD-ROM | disk | FTP | other *** search
- ;;; uncompress.el --- auto-decompression hook for visiting .Z files
-
- ;; Copyright (C) 1992, 1994 Free Software Foundation, Inc.
-
- ;; Maintainer: FSF
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; This package can be used to arrange for automatic uncompress of
- ;; files packed with the UNIX compress(1) utility when they are visited.
- ;; All that's necessary is to load it. This can conveniently be done from
- ;; your .emacs file.
-
- ;;; Code:
-
- ;; When we are about to make a backup file,
- ;; uncompress the file we visited
- ;; so that making the backup can work properly.
- ;; This is used as a write-file-hook.
-
- (defvar uncompress-program "gunzip"
- "Program to use for uncompression.")
-
- (defun uncompress-backup-file ()
- (and buffer-file-name make-backup-files (not buffer-backed-up)
- (not (file-exists-p buffer-file-name))
- (call-process uncompress-program nil nil nil buffer-file-name))
- nil)
-
- (or (assoc "\\.Z$" auto-mode-alist)
- (setq auto-mode-alist
- (cons '("\\.Z$" . uncompress-while-visiting) auto-mode-alist)))
- (or (assoc "\\.gz$" auto-mode-alist)
- (setq auto-mode-alist
- (cons '("\\.gz$" . uncompress-while-visiting) auto-mode-alist)))
-
- (defun uncompress-while-visiting ()
- "Temporary \"major mode\" used for .Z and .gz files, to uncompress them.
- It then selects a major mode from the uncompressed file name and contents."
- (if (and (not (null buffer-file-name))
- (string-match "\\.Z$" buffer-file-name))
- (set-visited-file-name
- (substring buffer-file-name 0 (match-beginning 0)))
- (if (and (not (null buffer-file-name))
- (string-match "\\.gz$" buffer-file-name))
- (set-visited-file-name
- (substring buffer-file-name 0 (match-beginning 0)))))
- (message "Uncompressing...")
- (let ((buffer-read-only nil))
- (shell-command-on-region (point-min) (point-max) uncompress-program t))
- (message "Uncompressing...done")
- (set-buffer-modified-p nil)
- (make-local-variable 'write-file-hooks)
- (or (memq 'uncompress-backup-file write-file-hooks)
- (setq write-file-hooks (cons 'uncompress-backup-file write-file-hooks)))
- (normal-mode))
-
- (or (memq 'find-compressed-version find-file-not-found-hooks)
- (setq find-file-not-found-hooks
- (cons 'find-compressed-version find-file-not-found-hooks)))
-
- (defun find-compressed-version ()
- "Hook to read and uncompress the compressed version of a file."
- ;; Just pretend we had visited the compressed file,
- ;; and uncompress-while-visiting will do the rest.
- (let (name)
- (if (file-exists-p (setq name (concat buffer-file-name ".Z")))
- (setq buffer-file-name name)
- (if (file-exists-p (setq name (concat buffer-file-name ".gz")))
- (setq buffer-file-name name)))
- (if (eq name buffer-file-name)
- (progn
- (insert-file-contents buffer-file-name t)
- (goto-char (point-min))
- (setq error nil)
- t))))
-
- (provide 'uncompress)
-
- ;;; uncompress.el ends here
-