[PATCH v2 5/4] emacs: Add customization for the first line of quotes.

[Adam Wolfe Gordon <awg+notmuch@xvx.ca>]

Add a customization option, notmuch-mua-reply-quoth, which controls
the first line of the reply body (typically, "On %date%, %from% wrote:").
This allows users who like other styles or correspond in other languages
to set an appropriate line using any of the quoted message's headers.
---

Due to some subsequent discussions in the thread about my original patch series,
I decided I may as well implement this sooner rather than later.

 emacs/notmuch-mua.el |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index b03c62c..c7fd9f8 100644
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -91,6 +91,14 @@ list."
       (fill-region (point-min) (point-max))
       (buffer-substring (point-min) (point-max)))))
 
+(defcustom notmuch-mua-reply-quoth "On %date%, %from% wrote:"
+  "The first line of a reply body, typically 'On %date%, %from% wrote:'.
+
+Any header fields from the message being replied to can be inserted by
+enclosing them in percents."
+  :group 'notmuch
+  :type 'string)
+
 (defun notmuch-mua-reply (query-string &optional sender reply-all)
   (let ((args '("reply" "--format=json"))
 	reply
@@ -132,10 +140,10 @@ list."
 	  (forward-line -1)
 	(goto-char (point-max)))
 
-      (insert (format "On %s, %s wrote:\n"
-		      (cdr (assq 'date original-headers))
-		      (cdr (assq 'from original-headers))))
-	   
+      (let ((quoth (replace-regexp-in-string "%.+?%" 
+					     (lambda (hdr) (cdr (assq (intern (substring hdr 1 (- (length hdr) 1))) original-headers)))
+					     notmuch-mua-reply-quoth)))
+	(insert quoth "\n"))
 
       (if (null plain-parts)
 	  (mapc (lambda (part) (notmuch-mua-insert-part-quoted (notmuch-mua-parse-html-part part))) html-parts)
-- 
1.7.5.4