[PATCH] emacs: Add notmuch-address.el for address completion using notmuch

[David Edmondson <dme@dme.org>]

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A tool `notmuch-addresses' is required to produce addresses which
match a query string. An example of a suitable script can be found in
the git repository at
    http://jkr.acm.jhu.edu/git/notmuch_addresses.git
There are no doubt others.
---
 emacs/Makefile.local     |    3 +-
 emacs/notmuch-address.el |   91 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 93 insertions(+), 1 deletions(-)
 create mode 100644 emacs/notmuch-address.el

diff --git a/emacs/Makefile.local b/emacs/Makefile.local
index e5013b3..7537c3d 100644
--- a/emacs/Makefile.local
+++ b/emacs/Makefile.local
@@ -8,7 +8,8 @@ emacs_sources := \
 	$(dir)/notmuch-show.el \
 	$(dir)/notmuch-wash.el \
 	$(dir)/notmuch-hello.el \
-	$(dir)/notmuch-mua.el
+	$(dir)/notmuch-mua.el \
+	$(dir)/notmuch-address.el
 
 emacs_images := \
 	$(dir)/notmuch-logo.png
diff --git a/emacs/notmuch-address.el b/emacs/notmuch-address.el
new file mode 100644
index 0000000..69a52a2
--- /dev/null
+++ b/emacs/notmuch-address.el
@@ -0,0 +1,91 @@
+;; notmuch-address.el --- address completion with notmuch
+;;
+;; Copyright © David Edmondson
+;;
+;; This file is part of Notmuch.
+;;
+;; Notmuch is free software: you can redistribute it and/or modify it
+;; under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; Notmuch is distributed in the hope that it will be useful, but
+;; WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;; General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with Notmuch.  If not, see <http://www.gnu.org/licenses/>.
+;;
+;; Authors: David Edmondson <dme@dme.org>
+
+(require 'message)
+
+;;
+
+(defcustom notmuch-address-command "notmuch-addresses"
+  "The command which generates possible addresses. It must take a
+single argument and output a list of possible matches, one per
+line."
+  :type 'string
+  :group 'notmuch)
+
+(defvar notmuch-address-message-alist-member
+  '("^\\(Resent-\\)?\\(To\\|B?Cc\\|Reply-To\\|From\\|Mail-Followup-To\\|Mail-Copies-To\\):"
+	      . notmuch-address-expand-name))
+
+(defvar notmuch-address-history nil)
+
+(defun notmuch-address-message-insinuate ()
+  (if (not (memq notmuch-address-message-alist-member message-completion-alist))
+      (setq message-completion-alist
+	    (push notmuch-address-message-alist-member message-completion-alist))))
+
+(defun notmuch-address-options (original)
+  (process-lines notmuch-address-command original))
+
+(defun notmuch-address-expand-name ()
+  (let* ((end (point))
+	 (beg (save-excursion
+		(re-search-backward "\\(\\`\\|[\n:,]\\)[ \t]*")
+		(goto-char (match-end 0))
+		(point)))
+	 (orig (buffer-substring-no-properties beg end))
+	 (completion-ignore-case t)
+	 (options (notmuch-address-options orig))
+	 (chosen (if (eq (length options) 1)
+		     (car options)
+		   (completing-read "Address: " (cdr options) nil nil (car options)
+				    'notmuch-address-history))))
+    (when chosen
+      (push chosen notmuch-address-history)
+      (delete-region beg end)
+      (insert chosen))))
+
+;; Copied from `w3m-which-command'.
+(defun notmuch-address-locate-command (command)
+  "Return non-nil if `command' is an executable either on
+`exec-path' or an absolute pathname."
+  (when (stringp command)
+    (if (and (file-name-absolute-p command)
+	     (file-executable-p command))
+	command
+      (setq command (file-name-nondirectory command))
+      (catch 'found-command
+	(let (bin)
+	  (dolist (dir exec-path)
+	    (setq bin (expand-file-name command dir))
+	    (when (or (and (file-executable-p bin)
+			   (not (file-directory-p bin)))
+		      (and (file-executable-p (setq bin (concat bin ".exe")))
+			   (not (file-directory-p bin))))
+	      (throw 'found-command bin))))))))
+
+;; If we can find the program specified by `notmuch-address-command',
+;; insinuate ourselves into `message-mode'.
+(when (notmuch-address-locate-command notmuch-address-command)
+  (notmuch-address-message-insinuate))
+
+;;
+
+(provide 'notmuch-address)
-- 
1.7.0