[notmuch] [PATCH -v4] notmuch.el: Add face support to search and show mode

[Aneesh Kumar K.V]

This add two faces, notmuch-show-subject-face and
notmuch-tag-face. The first face is used to show the subject
line in the notmuch-show-mode and the second one to show tags
in the notmuch-search-mode.

We can selectively highlight each tag by setting notmuch-tag-face-alist as below

(defface notmuch-tag-unread-face
 '((((class color) (background light)) (:foreground "goldenrod" :bold t))
    (((class color) (background dark)) (:foreground "goldenrod" :bold t)))
  "Notmuch search mode face used to highligh tags.")

(defface notmuch-tag-inbox-face
 '((((class color) (background light)) (:foreground "red" :bold t))
    (((class color) (background dark)) (:foreground "red" :bold t)))
  "Notmuch search mode face used to highligh tags.")

(setq notmuch-tag-face-alist '(("unread" . 'notmuch-tag-unread-face)
				 ("inbox" . 'notmuch-tag-inbox-face)))
(require 'notmuch)

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
---
 notmuch.el |   38 ++++++++++++++++++++++++++++++++++++--
 1 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/notmuch.el b/notmuch.el
index 551048a..5737f77 100644
--- a/notmuch.el
+++ b/notmuch.el
@@ -663,6 +663,17 @@ which this thread was originally shown."
       (notmuch-show-markup-message)))
   (notmuch-show-hide-markers))
 
+(defface notmuch-show-subject-face
+ '((((class color)) (:foreground "red")))
+  "Notmuch show mode face used to highligh subject line."
+  :group 'notmuch)
+
+(defvar notmuch-show-font-lock-keywords
+  (list ;; header in font-lock-type-face
+   (list "\\(Subject:.*$\\)"
+	 '(1  'notmuch-show-subject-face)))
+  "Additonal expression to hightlight in notmuch-show-mode")
+
 ;;;###autoload
 (defun notmuch-show-mode ()
   "Major mode for viewing a thread with notmuch.
@@ -695,7 +706,9 @@ view, (remove the \"inbox\" tag from each), with
   (use-local-map notmuch-show-mode-map)
   (setq major-mode 'notmuch-show-mode
 	mode-name "notmuch-show")
-  (setq buffer-read-only t))
+  (setq buffer-read-only t)
+  (set (make-local-variable 'font-lock-defaults)
+         '(notmuch-show-font-lock-keywords t)))
 
 ;;;###autoload
 
@@ -835,6 +848,16 @@ thread from that buffer can be show when done with this one)."
   (goto-char (point-max))
   (forward-line -1))
 
+(defface notmuch-tag-face
+ '((((class color)) (:foreground "red")))
+  "Notmuch search mode face used to highligh tags."
+  :group 'notmuch)
+
+(defvar notmuch-tag-face-alist nil
+  "List containing the tag list that need to be highlighed")
+
+(defvar notmuch-search-font-lock-keywords  nil)
+
 ;;;###autoload
 (defun notmuch-search-mode ()
   "Major mode for searching mail with notmuch.
@@ -865,7 +888,18 @@ global search.
   (setq truncate-lines t)
   (setq major-mode 'notmuch-search-mode
 	mode-name "notmuch-search")
-  (setq buffer-read-only t))
+  (setq buffer-read-only t)
+  (if (not notmuch-tag-face-alist)
+      (add-to-list 'notmuch-search-font-lock-keywords (list
+		"\\(([^)]*)$\\)" '(1  'notmuch-tag-face)))
+    (progn
+  (setq notmuch-search-tags (mapcar 'car notmuch-tag-face-alist))
+  (loop for notmuch-search-tag  in notmuch-search-tags
+    do (add-to-list 'notmuch-search-font-lock-keywords (list
+				(concat "\\(" notmuch-search-tag "\\)")
+		    `(1  ,(cdr (assoc notmuch-search-tag notmuch-tag-face-alist))))))))
+  (set (make-local-variable 'font-lock-defaults)
+         '(notmuch-search-font-lock-keywords t)))
 
 (defun notmuch-search-find-thread-id ()
   "Return the thread for the current thread"
-- 
1.6.5.2.74.g610f9