;;; uncompress.el --- auto-decompression hook for visiting .Z files
-;; Copyright (C) 1992 Free Software Foundation, Inc.
+;; 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 1, or (at your option)
+;; 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,
;; 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+;; 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
+;; compressed files when they are visited.
+;; All that's necessary is to load it. This can conveniently be done from
+;; your .emacs file.
+
+;; M-x auto-compression-mode is a more modern replacement for this package.
+
+;;; 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" nil nil nil 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)))
+(or (assoc "\\.tgz$" auto-mode-alist)
+ (setq auto-mode-alist
+ (cons '("\\.tgz$" . uncompress-while-visiting) auto-mode-alist)))
(defun uncompress-while-visiting ()
- "Temporary \"major mode\" used for .Z files, to uncompress the contents.
+ "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$" buffer-file-name))
(set-visited-file-name
- (substring buffer-file-name 0 (match-beginning 0))))
+ (substring buffer-file-name 0 (match-beginning 0)))
+ (if (and (not (null buffer-file-name))
+ (string-match "\\.gz$" buffer-file-name))
+ (set-visited-file-name
+ (substring buffer-file-name 0 (match-beginning 0)))
+ (if (and (not (null buffer-file-name))
+ (string-match "\\.tgz$" buffer-file-name))
+ (set-visited-file-name
+ (concat (substring buffer-file-name 0 (match-beginning 0)) ".tar")))))
(message "Uncompressing...")
- (let ((buffer-read-only nil))
- (shell-command-on-region (point-min) (point-max) "uncompress" t))
+ (let ((buffer-read-only nil)
+ (coding-system-for-write 'no-conversion)
+ (coding-system-for-read
+ (car (find-operation-coding-system
+ 'insert-file-contents
+ buffer-file-name t))))
+ (shell-command-on-region (point-min) (point-max) uncompress-program t))
+ (goto-char (point-min))
(message "Uncompressing...done")
(set-buffer-modified-p nil)
(make-local-variable 'write-file-hooks)
"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.
- (if (file-exists-p (concat buffer-file-name ".Z"))
- (progn
- (setq buffer-file-name (concat buffer-file-name ".Z"))
- (insert-file-contents buffer-file-name t)
- (goto-char (point-min))
- (setq error nil)
- t)))
+ (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))
+ ;; No need for this, because error won't be set to t
+ ;; if this function returns t.
+ ;; (setq error nil)
+ t))))
+
+(provide 'uncompress)
;;; uncompress.el ends here