emacs: Hide the "User-Agent:" when composing messages

Add a list of headers to those hidden by `message-mode' when
composing. By default the list includes only "User-Agent:".

diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index 004b50a367170bfd171fb240603c7c4f07722f62..bca20db95168e86396c7946e10437f4c1bd95041 100644 (file)
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -41,6 +41,12 @@
             notmuch-mua-user-agent-notmuch
             notmuch-mua-user-agent-emacs))
 
+(defcustom notmuch-mua-hidden-headers '("^User-Agent:")
+  "Headers that are added to the `message-mode' hidden headers
+list."
+  :group 'notmuch
+  :type '(repeat string))
+
 ;;
 
 (defun notmuch-mua-user-agent-full ()
@@ -57,6 +63,13 @@
   "Generate a `User-Agent:' string suitable for notmuch."
   (concat "Emacs/" emacs-version " (" system-configuration ")"))
 
+(defun notmuch-mua-add-more-hidden-headers ()
+  "Add some headers to the list that are hidden by default."
+  (mapc (lambda (header)
+         (when (not (member header 'message-hidden-headers))
+           (push header message-hidden-headers)))
+       notmuch-mua-hidden-headers))
+
 (defun notmuch-mua-reply (query-string)
   (let (headers body)
     ;; This make assumptions about the output of `notmuch reply', but
@@ -134,6 +147,10 @@ simply runs the corresponding `message-mode' hook functions."
   'notmuch-mua-mail 'notmuch-mua-send-and-exit
   'notmuch-mua-kill-buffer 'notmuch-mua-send-hook)
 
+;; Add some more headers to the list that `message-mode' hides when
+;; composing a message.
+(notmuch-mua-add-more-hidden-headers)
+
 ;;
 
 (provide 'notmuch-mua)