bug#21947: 24.5; epa: option for always replace encrypted text without asking

[Christian Schwarzgruber]

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Hey,

I would like to provide a patch for a new functionality in epa.el.

When I get a new encrypted email and I hit `C-c C-e d' (epa-mail-decrypt) epa
asks, if I want replace the original text. Which in my opinion is a bit
superfluous in this case. This will become especially unpleasant once the
auto-decrypt functionality is implemented in mu/mu4e.

So I patched epa.el and added a boolean `defcustom', when set to `t',
the text will always be replaced without asking.

Thank you for your attention!

- --
Christian Schwarzgruber
E: c.schwarzgruber.cs@gmail.com
GPG key ID: C57AB673

>From ce12716f1c2760fd356aadf0fffff118fd5643d9 Mon Sep 17 00:00:00 2001
From: Christian Schwarzgruber <c.schwarzgruber.cs@gmail.com>
Date: Sun, 15 Nov 2015 22:31:41 +0100
Subject: [PATCH] lisp/epa.el: add option to always replace original text

---
 lisp/epa.el | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lisp/epa.el b/lisp/epa.el
index 9f112c4..af5688b 100644
--- a/lisp/epa.el
+++ b/lisp/epa.el
@@ -34,6 +34,11 @@ epa
   :link '(custom-manual "(epa) Top")
   :group 'epg)
 
+(defcustom epa-always-replace-original-text nil
+  "Always replace original text with decrypted."
+  :type 'boolean
+  :group 'epa)
+
 (defcustom epa-popup-info-window t
   "If non-nil, display status information from epa commands in another window."
   :type 'boolean
@@ -872,7 +877,8 @@ epa-decrypt-region
          (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 epa-always-replace-original-text
+               (y-or-n-p "Replace the original text? "))
            (let ((inhibit-read-only t))
              (delete-region start end)
              (goto-char start)
-- 
2.5.0

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