[notmuch] [PATCHv2] notmuch.el: colorize lines in notmuch-search based on thread tags.

[Jameson Graef Rollins]

Arbitrary font faces can be specified for given thread tags.  By
default, no coloring is applied.  To specify coloring, place something
like this in your .emacs:

(setq notmuch-search-line-faces '(("delete" . (:foreground "red"))
                                  ("unread" . (:foreground "green"))))

Order matters: line faces listed first will take precedence (in the
example above, a thread tagged both "delete" and "unread" will be
colored red, since the "delete" face is listed before the "unread").
---
 notmuch.el |   34 +++++++++++++++++++++++++++++++++-
 1 files changed, 33 insertions(+), 1 deletions(-)

diff --git a/notmuch.el b/notmuch.el
index a21c6a6..6c42b37 100644
--- a/notmuch.el
+++ b/notmuch.el
@@ -1203,6 +1203,36 @@ This function advances the next thread when finished."
 			    (insert (format " (process returned %d)" exit-status)))
 			(insert "\n"))))))))))
 
+(defcustom notmuch-search-line-faces
+  '(("delete" . (:foreground "DarkGrey")))
+  "Tag/face mapping for line highlighting in notmuch-search.
+
+Here is an example of how to color search results based on tags.
+(the following text would be placed in your ~/.emacs file):
+
+(setq notmuch-search-line-faces '((\"delete\" . (:foreground \"red\"))
+				  (\"unread\" . (:foreground \"green\"))))
+
+Order matters: for lines with multiple tags, the the first
+matching will be applied."
+  :type '(alist :value-type (string face))
+  :group 'notmuch)
+
+(defun notmuch-search-color-line (start end line-tag-list)
+  "Colorize lines in notmuch-search based on tags"
+  (if notmuch-search-line-faces
+      (let ((overlay (make-overlay start end))
+	    (tags-faces (copy-alist notmuch-search-line-faces)))
+	(while tags-faces
+	  (let* ((tag-face (car tags-faces))
+		 (tag (car tag-face))
+		 (face (cdr tag-face)))
+	    (cond ((member tag line-tag-list)
+		   (overlay-put overlay 'face face)
+		   (setq tags-faces nil))
+		  (t
+		   (setq tags-faces (cdr tags-faces)))))))))
+
 (defun notmuch-search-process-filter (proc string)
   "Process and filter the output of \"notmuch search\""
   (let ((buffer (process-buffer proc)))
@@ -1220,12 +1250,14 @@ This function advances the next thread when finished."
 			   (authors (match-string 4 string))
 			   (authors-length (length authors))
 			   (subject (match-string 5 string))
-			   (tags (match-string 6 string)))
+			   (tags (match-string 6 string))
+			   (tag-list (if tags (save-match-data (split-string tags)))))
 		      (if (> authors-length 40)
 			  (set 'authors (concat (substring authors 0 (- 40 3)) "...")))
 		      (goto-char (point-max))
 		      (let ((beg (point-marker)))
 			(insert (format "%s %-7s %-40s %s (%s)\n" date count authors subject tags))
+			(notmuch-search-color-line beg (point-marker) tag-list)
 			(put-text-property beg (point-marker) 'notmuch-search-thread-id thread-id)
 			(put-text-property beg (point-marker) 'notmuch-search-authors authors)
 			(put-text-property beg (point-marker) 'notmuch-search-subject subject))
-- 
1.6.5