emacs/notmuch-address.el: add notmuch-address-selection-function

Added a customizable variable notmuch-address-selection-function
and the function with the same name to provide a way for user to
change the function called to do address selection.

By default the functionality is exactly the same as it has been so
far; completing-read is called with the same parameters as before.

Setting equivalent lambda expression in place of using
notmuch-address-selection-function function is done as follows:

(setq notmuch-address-selection-function
   (lambda (prompt collection initial-input)
     (completing-read prompt collection nil nil initial-input)))

For example drop-in replacement with ido-completing-read can be done
easily as an one alternative to the default.

diff --git a/emacs/notmuch-address.el b/emacs/notmuch-address.el
index 2bf762ba9b1a0ae3a3970cf2ac2dfdc4ef4071f1..fa65cd52a318d5d91fb4eaf4fa3f751127159ec3 100644 (file)
--- a/emacs/notmuch-address.el
+++ b/emacs/notmuch-address.el
@@ -31,6 +31,23 @@ line."
   :group 'notmuch-send
   :group 'notmuch-external)
 
+(defcustom notmuch-address-selection-function 'notmuch-address-selection-function
+  "The function to select address from given list. The function is
+called with PROMPT, COLLECTION, and INITIAL-INPUT as arguments
+(subset of what `completing-read' can be called with).
+While executed the value of `completion-ignore-case' is t.
+See documentation of function `notmuch-address-selection-function'
+to know how address selection is made by default."
+  :type 'function
+  :group 'notmuch-send
+  :group 'notmuch-external)
+
+(defun notmuch-address-selection-function (prompt collection initial-input)
+  "Call (`completing-read'
+      PROMPT COLLECTION nil nil INITIAL-INPUT 'notmuch-address-history)"
+  (completing-read
+   prompt collection nil nil initial-input 'notmuch-address-history))
+
 (defvar notmuch-address-message-alist-member
   '("^\\(Resent-\\)?\\(To\\|B?Cc\\|Reply-To\\|From\\|Mail-Followup-To\\|Mail-Copies-To\\):"
              . notmuch-address-expand-name))
@@ -61,9 +78,9 @@ line."
                  ((eq num-options 1)
                   (car options))
                  (t
-                  (completing-read (format "Address (%s matches): " num-options)
-                                   (cdr options) nil nil (car options)
-                                   'notmuch-address-history)))))
+                  (funcall notmuch-address-selection-function
+                           (format "Address (%s matches): " num-options)
+                           (cdr options) (car options))))))
     (if chosen
        (progn
          (push chosen notmuch-address-history)