[PATCH v2 4/5] emacs: add notmuch hello refresh hook to display message count change

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+From: Jani Nikula <jani@nikula.org>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH v2 4/5] emacs: add notmuch hello refresh hook to display\r
+       message count change\r
+Date: Sun,  2 Sep 2012 17:48:36 +0300\r
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+\r
+Add a notmuch hello refresh hook to display a message about change in\r
+message count in the database since the notmuch-hello buffer was last\r
+refreshed manually (no-display is nil).\r
+\r
+Signed-off-by: Jani Nikula <jani@nikula.org>\r
+---\r
+ emacs/notmuch-hello.el |   38 ++++++++++++++++++++++++++++++++++++++\r
+ 1 file changed, 38 insertions(+)\r
+\r
+diff --git a/emacs/notmuch-hello.el b/emacs/notmuch-hello.el\r
+index fa14443..f7a3c95 100644\r
+--- a/emacs/notmuch-hello.el\r
++++ b/emacs/notmuch-hello.el\r
+@@ -148,6 +148,7 @@ International Bureau of Weights and Measures."\r
+ (defcustom notmuch-hello-refresh-hook nil\r
+   "Functions called after updating a `notmuch-hello' buffer."\r
+   :type 'hook\r
++  :options '(notmuch-hello-refresh-status-message)\r
+   :group 'notmuch-hello\r
+   :group 'notmuch-hooks)\r
+ \r
+@@ -749,6 +750,43 @@ following:\r
+     (let ((fill-column (- (window-width) notmuch-hello-indent)))\r
+       (center-region start (point)))))\r
+ \r
++(defcustom notmuch-hello-refresh-status-query "*"\r
++  "Query to use for `notmuch-hello-refresh-status-message' hook."\r
++  :type '(choice (const :tag "All messages" "*")\r
++               (string :tag "Custom query"\r
++                       :value "tag:inbox"))\r
++  :group 'notmuch-hello)\r
++\r
++(defvar notmuch-hello-refresh-count 0\r
++  "Number of matching messages when `notmuch-hello' was last run.\r
++\r
++Used internally by `notmuch-hello-refresh-status-message'.")\r
++\r
++(defun notmuch-hello-refresh-status-message (no-display)\r
++  "Hook to display a status message when refreshing notmuch-hello buffer.\r
++\r
++Display a status message about the difference in message count\r
++matching `notmuch-hello-refresh-status-query' since the last time\r
++notmuch-hello was refreshed. Only takes into account explicit\r
++refreshes (NO-DISPLAY is nil)."\r
++  (unless no-display\r
++    (let* ((new-count\r
++          (string-to-number\r
++           (car (process-lines notmuch-command "count"\r
++                               notmuch-hello-refresh-status-query))))\r
++         (diff-count (- new-count notmuch-hello-refresh-count)))\r
++      (cond\r
++       ((= notmuch-hello-refresh-count 0)\r
++      (message "You have %s messages."\r
++               (notmuch-hello-nice-number new-count)))\r
++       ((> diff-count 0)\r
++      (message "You have %s more messages since last refresh."\r
++               (notmuch-hello-nice-number diff-count)))\r
++       ((< diff-count 0)\r
++      (message "You have %s fewer messages since last refresh."\r
++               (notmuch-hello-nice-number (- diff-count)))))\r
++      (setq notmuch-hello-refresh-count new-count))))\r
++\r
+ ;;;###autoload\r
+ (defun notmuch-hello (&optional no-display)\r
+   "Run notmuch and display saved searches, known tags, etc.\r
+-- \r
+1.7.9.5\r
+\r