[PATCH v2 3/4] emacs: Improve prompting for user address when replying.

[Mark Walters <markwalters1009@gmail.com>]

This patch uses the new --from option to notmuch reply to allow it to
prompt the user for the From: address in cases when the cli does not
know the "correct" from address. If the cli does not it either uses
the users default address or, if notmuch-always-prompt-for-sender
is set, prompts the user.
---
 emacs/notmuch-mua.el |   47 ++++++++++++++++++++++++++++-------------------
 1 files changed, 28 insertions(+), 19 deletions(-)

diff --git a/emacs/notmuch-mua.el b/emacs/notmuch-mua.el
index 41f82c2..36e62f9 100644
--- a/emacs/notmuch-mua.el
+++ b/emacs/notmuch-mua.el
@@ -51,6 +51,24 @@ list."
 
 ;;
 
+(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."
+  :type '(repeat string)
+  :group 'notmuch-send)
+
+(defcustom notmuch-always-prompt-for-sender nil
+  "Always prompt for the From: address when composing or forwarding a message.
+
+This is not taken into account when replying to a message, because in that case
+the From: header is already filled in by notmuch."
+  :type 'boolean
+  :group 'notmuch-send)
+
+(defvar notmuch-mua-sender-history nil)
+
 (defun notmuch-mua-user-agent-full ()
   "Generate a `User-Agent:' string suitable for notmuch."
   (concat (notmuch-mua-user-agent-notmuch)
@@ -75,7 +93,7 @@ list."
 (defun notmuch-mua-reply (query-string &optional sender reply-all)
   (let (headers
 	body
-	(args '("reply")))
+	(args '("reply" "--from=fallback-received")))
     (if notmuch-show-process-crypto
 	(setq args (append args '("--decrypt"))))
     (if reply-all
@@ -99,6 +117,15 @@ list."
     ;; If sender is non-nil, set the From: header to its value.
     (when sender
       (mail-header-set 'from sender headers))
+    ;; If we do not have a From: header yet it means that
+    ;; notmuch-reply.c was not able to make a useful guess so we fill
+    ;; it in ourselves.
+    (when (string= "" (mail-header 'from headers))
+      (if notmuch-always-prompt-for-sender
+	  (setq sender (notmuch-mua-prompt-for-sender))
+	(setq sender (concat
+		      (notmuch-user-name) " <" (notmuch-user-primary-email) ">")))
+      (mail-header-set 'from sender headers))
     (let
 	;; Overlay the composition window on that being used to read
 	;; the original message.
@@ -153,24 +180,6 @@ OTHER-ARGS are passed through to `message-mail'."
 
   (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."
-  :type '(repeat string)
-  :group 'notmuch-send)
-
-(defcustom notmuch-always-prompt-for-sender nil
-  "Always prompt for the From: address when composing or forwarding a message.
-
-This is not taken into account when replying to a message, because in that case
-the From: header is already filled in by notmuch."
-  :type 'boolean
-  :group 'notmuch-send)
-
-(defvar notmuch-mua-sender-history nil)
-
 (defun notmuch-mua-prompt-for-sender ()
   (interactive)
   (let (name addresses one-name-only)
-- 
1.7.2.3