epa.el: Add option to replace original text

* lisp/epa.el (epa-replace-original-text): New user option.
(Bug#21947)

Copyright-paperwork-exempt: yes

1 files changed, 17 insertions, 2 deletions

diff --git a/lisp/epa.el b/lisp/epa.el
index 9f112c4eb83..e51d5d86540 100644
--- a/lisp/epa.el
+++ b/lisp/epa.el
@@ -34,6 +34,17 @@
   :link '(custom-manual "(epa) Top")
   :group 'epg)
 
+(defcustom epa-replace-original-text 'ask
+  "Whether the original text shall be replaced by the decrypted.
+
+If t, replace the original text without any confirmation.
+If nil, don't replace the original text and show the result in a new buffer.
+If neither t nor nil, ask user for confirmation."
+  :type '(choice (const :tag "Never" nil)
+		 (const :tag "Ask the user" ask)
+		 (const :tag "Always" t))
+  :group 'epa)
+
 (defcustom epa-popup-info-window t
   "If non-nil, display status information from epa commands in another window."
   :type 'boolean
@@ -872,7 +883,9 @@ For example:
 	  (with-current-buffer (funcall make-buffer-function)
 	    (let ((inhibit-read-only t))
 	      (insert plain)))
-	(if (y-or-n-p "Replace the original text? ")
+	(if (or (eq epa-replace-original-text t)
+                (and epa-replace-original-text
+                     (y-or-n-p "Replace the original text? ")))
 	    (let ((inhibit-read-only t))
 	      (delete-region start end)
 	      (goto-char start)
@@ -968,7 +981,9 @@ For example:
 		 (or coding-system-for-read
 		     (get-text-property start 'epa-coding-system-used)
 		     'undecided)))
-    (if (y-or-n-p "Replace the original text? ")
+    (if (or (eq epa-replace-original-text t)
+            (and epa-replace-original-text
+                 (y-or-n-p "Replace the original text? ")))
 	(let ((inhibit-read-only t)
 	      buffer-read-only)
 	  (delete-region start end)