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)" 
                        (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 
                      (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))

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