* emacs/notmuch-show.el (notmuch-show-buttonized-link-present),
* emacs/notmuch-show.el (notmuch-show-buttonized-link-present-and-unread),
* emacs/notmuch-show.el (notmuch-show-buttonized-link-missing):
  new faces for buttonized id: links.

* emacs/notmuch-show.el (notmuch-show-found-target-p): add optional arg
  VERIFY-UNREAD which causes results to be filtered by "tag:unread".

* emacs/notmuch-show.el (notmuch-show-buttonize-links): use different
  face property depending on the result of `notmuch-show-found-target-p',
  causing buttons to present, present-and-unread and missing messages to
  be displayed in a different color.
---
 emacs/notmuch-show.el |   32 +++++++++++++++++++++++++++++---
 1 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 8f12955..25330c4 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -797,6 +797,27 @@ current buffer, if possible."
 (defvar notmuch-show-buffer-name nil)
 (make-variable-buffer-local 'notmuch-show-buffer-name)

+(defface notmuch-show-buttonized-link-present
+  '((t (:inherit goto-address-mail-face :foreground "blue")))
+  "Face used for buttonized links to messages which are present
+in the mail store."
+  :group 'notmuch-show
+  :group 'notmuch-appearance)
+
+(defface notmuch-show-buttonized-link-present-and-unread
+  '((t (:inherit goto-address-mail-face :foreground "green")))
+  "Face used for buttonized links to messages which are present
+in the mail store, and are tagged `unread'."
+  :group 'notmuch-show
+  :group 'notmuch-appearance)
+
+(defface notmuch-show-buttonized-link-missing
+  '((t (:inherit goto-address-mail-face :foreground "red")))
+  "Face used for buttonized links to messages which are NOT
+present in in the mail store."
+  :group 'notmuch-show
+  :group 'notmuch-appearance)
+
 (defun notmuch-show-buttonize-links (start end)
   "Buttonize URLs and mail addresses between START and END.

@@ -816,7 +837,12 @@ a corresponding notmuch search."
                                   (notmuch-show-if-found ,message-id))
                        'follow-link t
                        'help-echo "Mouse-1, RET: search for this message"
-                       'face goto-address-mail-face))))
+                       'face (cond
+                              ((notmuch-show-found-target-p message-id t)
+                               
'notmuch-show-buttonized-link-present-and-unread)
+                              ((notmuch-show-found-target-p message-id)
+                               'notmuch-show-buttonized-link-present)
+                              (t 'notmuch-show-buttonized-link-missing)))))))

 ;;;###autoload
 (defun notmuch-show (thread-id &optional parent-buffer query-context 
buffer-name crypto-switch)
@@ -909,8 +935,8 @@ thread id.  If a prefix is given, crypto processing is 
toggled."
     (notmuch-kill-this-buffer)
     (notmuch-show-worker thread-id parent-buffer query-context buffer-name 
process-crypto)))

-(defun notmuch-show-found-target-p (target)
-  (let ((args `("count" ,target)))
+(defun notmuch-show-found-target-p (target &optional verify-unread)
+  (let ((args `("count" ,target ,(if verify-unread "and tag:unread" ""))))
     (> (string-to-number (substring
       (with-output-to-string
         (apply 'call-process notmuch-command nil standard-output nil args))
-- 
1.7.8.1

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