emacs: Helpers needed for the user to be able to choose the "From" address when compo...

This adds functions and variables needed for this feature to be implemented.
Once it's done, the user will be able to use a prefix argument (e.g. pressing
C-u m instead of m) and be able to select a From address.

By default the list of names/addresses to be used during completion will be
automatically generated by the settings in the notmuch configuration file. The
user can customize the notmuch-identities variable to provide an alternate list.

This is based on a previous patch by Carl Worth
(id:"87wrhfvk6a.fsf@yoom.home.cworth.org" and follow-ups).

diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index dc7b386f23c32abbba3a8e8ad8966764ce9d0c8c..dee2279a0e860c70508df66d72d23be4b3b37684 100644 (file)
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -138,6 +138,29 @@ list."
 
   (message-goto-to))
 
+(defcustom notmuch-identities nil
+  "Identities that can be used as the From: address when composing a new message.
+
+If this variable is left unset, then a list will be constructed from the
+name and addresses configured in the notmuch configuration file."
+  :group 'notmuch
+  :type '(repeat string))
+
+(defun notmuch-mua-sender-collection ()
+  (if notmuch-identities
+      notmuch-identities
+    (mapcar (lambda (address)
+             (concat (notmuch-user-name) " <" address ">"))
+           (cons (notmuch-user-primary-email) (notmuch-user-other-email)))))
+
+(defvar notmuch-mua-sender-history nil)
+
+(defun notmuch-mua-prompt-for-sender ()
+  (interactive)
+  (let ((collection (notmuch-mua-sender-collection)))
+    (ido-completing-read "Send mail From: " collection
+                        nil 'confirm nil 'notmuch-mua-sender-history (car collection))))
+
 (defun notmuch-mua-send-and-exit (&optional arg)
   (interactive "P")
   (message-send-and-exit arg))