2 files changed, 18 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 66845d062ac..8b5a92b0d56 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,7 @@
 2000-09-20  Miles Bader  <miles@lsi.nec.co.jp>
 
+        * jka-compr.el (with-auto-compression-mode): New macro.
+
         * cus-edit.el (custom-face-tag-face, custom-group-tag-face-1)
         (custom-group-tag-face, custom-variable-tag-face): Use relative
         :height and inherit from `variable-pitch' face instead of
diff --git a/lisp/jka-compr.el b/lisp/jka-compr.el
index 7539ef9999c..1d67272008e 100644
--- a/lisp/jka-compr.el
+++ b/lisp/jka-compr.el
@@ -1,6 +1,6 @@
 ;;; jka-compr.el --- reading/writing/loading compressed files
 
-;; Copyright (C) 1993, 1994, 1995, 1997, 1999  Free Software Foundation, Inc.
+;; Copyright (C) 1993, 1994, 1995, 1997, 1999, 2000  Free Software Foundation, Inc.
 
 ;; Author: jka@ece.cmu.edu (Jay K. Adams)
 ;; Maintainer: FSF
@@ -812,6 +812,21 @@ saying whether the mode is now on or off."
 
     flag))
 
+
+(defmacro with-auto-compression-mode (&rest body)
+  "Evalutes BODY with automatic file compression and uncompression enabled."
+  (let ((already-installed (make-symbol "already-installed")))
+    `(let ((,already-installed (jka-compr-installed-p)))
+       (unwind-protect
+           (progn
+             (unless ,already-installed
+               (jka-compr-install))
+             ,@body)
+         (unless ,already-installed
+           (jka-compr-uninstall))))))
+(put 'with-auto-compression-mode 'lisp-indent-function 0)
+
+
 (defun jka-compr-build-file-regexp ()
   (concat
    "\\("