1 files changed, 11 insertions, 2 deletions

diff --git a/lisp/uncompress.el b/lisp/uncompress.el
index cdfa1882d38..9da57a32d4d 100644
--- a/lisp/uncompress.el
+++ b/lisp/uncompress.el
@@ -24,10 +24,12 @@
 ;;; 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,
@@ -50,6 +52,9 @@
 (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 and .gz files, to uncompress them.
@@ -61,7 +66,11 @@ It then selects a major mode from the uncompressed file name and contents."
     (if (and (not (null buffer-file-name))
              (string-match "\\.gz$" buffer-file-name))
         (set-visited-file-name
-         (substring buffer-file-name 0 (match-beginning 0)))))
+         (substring buffer-file-name 0 (match-beginning 0)))
+      (if (and (not (null buffer-file-name))
+               (string-match "\\.tgz$" 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-program t))