(uncompress-while-visiting):

[bpt/emacs.git] / lisp / uncompress.el

diff --git a/lisp/uncompress.el b/lisp/uncompress.el
index a44590a..5343919 100644 (file)
--- a/lisp/uncompress.el
+++ b/lisp/uncompress.el
@@ -1,6 +1,6 @@
 ;;; 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
 
@@ -17,16 +17,19 @@
 ;; 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
-;; files packed with the UNIX compress(1) utility when they are visited.
+;; 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,
@@ -34,26 +37,49 @@
 ;; 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)
@@ -69,13 +95,19 @@ It then selects a major mode from the uncompressed file name and contents."
   "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)