[PATCH 2/4] emacs: Make tags in notmuch-show header-line clickable

diff --git a/e9/6b658ad27614274e9e421416e928a01639fc99 b/e9/6b658ad27614274e9e421416e928a01639fc99
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+++ b/e9/6b658ad27614274e9e421416e928a01639fc99
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+From: Damien Cassou <damien.cassou@gmail.com>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 2/4] emacs: Make tags in notmuch-show header-line clickable\r
+Date: Tue, 11 Dec 2012 10:00:35 +0100\r
+Message-Id: <1355216437-21109-3-git-send-email-damien.cassou@gmail.com>\r
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+\r
+Signed-off-by: Damien Cassou <damien.cassou@gmail.com>\r
+---\r
+ emacs/notmuch-tagger.el |   54 ++++++++++++++++++++++++++++++++++++++++++++++-\r
+ 1 file changed, 53 insertions(+), 1 deletion(-)\r
+\r
+diff --git a/emacs/notmuch-tagger.el b/emacs/notmuch-tagger.el\r
+index 6fcebff..38b858a 100644\r
+--- a/emacs/notmuch-tagger.el\r
++++ b/emacs/notmuch-tagger.el\r
+@@ -23,12 +23,64 @@\r
+ ;;; Code:\r
+ ;;\r
+ \r
++(defun notmuch-tagger-header-button-present-p ()\r
++  "Check if `header-button' can be loaded or is already loaded.\r
++\r
++`header-button' is a third-party library which facilitates the\r
++creation of links in emacs header-line. This function tries to\r
++`require' `header-button' and returns nil if and only if this\r
++fails."\r
++  (require 'header-button nil t))\r
++\r
++(defun notmuch-tagger-goto-target (tag)\r
++  "Show a `notmuch-search' buffer for the TAG."\r
++  (notmuch-search (concat "tag:\"" tag "\"")))\r
++\r
++(defun notmuch-tagger-header-button-action (button)\r
++  "Open `notmuch-search' for the tag referenced by BUTTON.\r
++This function depends on the presence of the `header-button'\r
++library. Please call `notmuch-tagger-header-button-present-p' to\r
++test if the library is present before calling this function."\r
++  (let ((tag (header-button-get button 'notmuch-tagger-tag)))\r
++    (notmuch-tagger-goto-target tag)))\r
++\r
++(eval-after-load "header-button"\r
++  '(define-button-type 'notmuch-tagger-header-button-type\r
++     'supertype 'header\r
++     'action    #'notmuch-tagger-header-button-action\r
++     'follow-link t))\r
++\r
++(defun notmuch-tagger-really-make-header-link (tag)\r
++   "Return a property list that presents a link to TAG.\r
++\r
++The returned property list will only work in the header-line.\r
++Additionally, this function depends on the presence of the\r
++`header-button' library. Please call\r
++`notmuch-tagger-header-button-present-p' to test if library is\r
++present before calling this function."\r
++   (header-button-format\r
++    tag\r
++    :type 'notmuch-tagger-header-button-type\r
++    'notmuch-tagger-tag tag\r
++    'help-echo (format "%s: Search other messages like this" tag)))\r
++\r
++(defun notmuch-tagger-make-header-link (tag)\r
++  "Return a property list to present TAG as a link to search.\r
++\r
++This only works if `header-button' is loaded. Simply returns tag\r
++if not."\r
++  (if (notmuch-tagger-header-button-present-p)\r
++      (notmuch-tagger-really-make-header-link tag)\r
++    tag))\r
++\r
+ (defun notmuch-tagger-format-tags-header-line (tags)\r
+   "Format TAGS as a `mode-line-format' template.\r
+ The result is suitable for inclusion in `header-line-format'."\r
+   (list\r
+    "("\r
+-   (notmuch-intersperse tags " ")\r
++   (notmuch-intersperse\r
++    (mapcar #'notmuch-tagger-make-header-link tags)\r
++    " ")\r
+    ")"))\r
+ \r
+ (provide 'notmuch-tagger)\r
+-- \r
+1.7.10.4\r
+\r