Prevent find-file from opening empty buffer when decryptin failed (bug#6568).

* epa-file.el (epa-file-error, epa-file--find-file-not-found-function)
(epa-file-insert-file-contents): Hack to prevent
find-file from opening empty buffer when decryptin failed
(bug#6568).

2 files changed, 24 insertions, 0 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 6fef9173109..f793f91a932 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2010-07-08  Daiki Ueno  <ueno@unixuser.org>
+
+        * epa-file.el (epa-file-error, epa-file--find-file-not-found-function)
+        (epa-file-insert-file-contents): Hack to prevent
+        find-file from opening empty buffer when decryptin failed
+        (bug#6568).
+
 2010-07-07  Agustín Martín  <agustin.martin@hispalinux.es>
 
         * ispell.el (ispell-alternate-dictionary): Use file-readable-p.
diff --git a/lisp/epa-file.el b/lisp/epa-file.el
index 2bbb0aa6455..5870f23bf13 100644
--- a/lisp/epa-file.el
+++ b/lisp/epa-file.el
@@ -101,6 +101,14 @@ way."
     (insert (epa-file--decode-coding-string string (or coding-system-for-read
                                                        'undecided)))))
 
+(defvar epa-file-error nil)
+(defun epa-file--find-file-not-found-function ()
+  (let ((error epa-file-error))
+    (save-window-excursion
+      (kill-buffer))
+    (signal 'file-error
+            (cons "Opening input file" (cdr error)))))
+
 (defvar last-coding-system-used)
 (defun epa-file-insert-file-contents (file &optional visit beg end replace)
   (barf-if-buffer-read-only)
@@ -131,6 +139,15 @@ way."
             (error
              (if (setq entry (assoc file epa-file-passphrase-alist))
                  (setcdr entry nil))
+             ;; Hack to prevent find-file from opening empty buffer
+             ;; when decryption failed (bug#6568).  See the place
+             ;; where `find-file-not-found-functions' are called in
+             ;; `find-file-noselect-1'.
+             (make-local-variable 'epa-file-error)
+             (setq epa-file-error error)
+             (add-hook 'find-file-not-found-functions
+                       'epa-file--find-file-not-found-function
+                       nil t)
              (signal 'file-error
                      (cons "Opening input file" (cdr error)))))
           (make-local-variable 'epa-file-encrypt-to)