[PATCH 3/4] emacs: Make all tags in `notmuch-show' clickable

[Damien Cassou <damien.cassou@gmail.com>]

Signed-off-by: Damien Cassou <damien.cassou@gmail.com>
---
 emacs/notmuch-show.el   |   15 +++++++--------
 emacs/notmuch-tagger.el |   33 +++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+), 8 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index a71497a..93bce07 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -362,10 +362,8 @@ operation on the contents of the current buffer."
     (goto-char (notmuch-show-message-top))
     (if (re-search-forward "(\\([^()]*\\))$" (line-end-position) t)
 	(let ((inhibit-read-only t))
-	  (replace-match (concat "("
-				 (propertize (mapconcat 'identity tags " ")
-					     'face 'notmuch-tag-face)
-				 ")")))))
+	  (replace-match (propertize (notmuch-tagger-format-tags tags)
+				     'face 'notmuch-tag-face)))))
   (notmuch-show-update-header-line))
 
 (defun notmuch-clean-address (address)
@@ -442,10 +440,11 @@ message at DEPTH in the current thread."
 	    (notmuch-show-clean-address (plist-get headers :From))
 	    " ("
 	    date
-	    ") ("
-	    (propertize (mapconcat 'identity tags " ")
-			'face 'notmuch-tag-face)
-	    ")\n")
+	    ") "
+	    (propertize
+	     (notmuch-tagger-format-tags tags)
+	     'face 'notmuch-tag-face)
+	    "\n")
     (overlay-put (make-overlay start (point)) 'face 'notmuch-message-summary-face)))
 
 (defun notmuch-show-insert-header (header header-value)
diff --git a/emacs/notmuch-tagger.el b/emacs/notmuch-tagger.el
index 38b858a..35b81ca 100644
--- a/emacs/notmuch-tagger.el
+++ b/emacs/notmuch-tagger.el
@@ -44,12 +44,21 @@ test if the library is present before calling this function."
   (let ((tag (header-button-get button 'notmuch-tagger-tag)))
     (notmuch-tagger-goto-target tag)))
 
+(defun notmuch-tagger-body-button-action (button)
+  "Open `notmuch-search' for the tag referenced by BUTTON."
+  (let ((tag (button-get button 'notmuch-tagger-tag)))
+    (notmuch-tagger-goto-target tag)))
+
 (eval-after-load "header-button"
   '(define-button-type 'notmuch-tagger-header-button-type
      'supertype 'header
      'action    #'notmuch-tagger-header-button-action
      'follow-link t))
 
+(define-button-type 'notmuch-tagger-body-button-type
+  'action    #'notmuch-tagger-body-button-action
+  'follow-link t)
+
 (defun notmuch-tagger-really-make-header-link (tag)
    "Return a property list that presents a link to TAG.
 
@@ -73,6 +82,20 @@ if not."
       (notmuch-tagger-really-make-header-link tag)
     tag))
 
+(defun notmuch-tagger-make-body-link (tag)
+  "Return a property list that presents a link to TAG.
+The returned property list will not work in the header-line. For
+a link that works on the header-line, prefer
+`notmuch-tagger-make-header-link'."
+  (let ((button (copy-sequence tag)))
+    (make-text-button
+     button nil
+     'type 'notmuch-tagger-body-button-type
+     'notmuch-tagger-tag tag
+     'skip t ;; don't stop when using TAB
+     'help-echo (format "%s: Search other messages like this" tag))
+    button))
+
 (defun notmuch-tagger-format-tags-header-line (tags)
   "Format TAGS as a `mode-line-format' template.
 The result is suitable for inclusion in `header-line-format'."
@@ -83,5 +106,15 @@ The result is suitable for inclusion in `header-line-format'."
     " ")
    ")"))
 
+(defun notmuch-tagger-format-tags (tags)
+  "Format TAGS as a string suitable for insertion in a buffer.
+If the result of this function is to be used within the
+header-line, prefer `notmuch-tagger-format-tags-header-line'
+instead of this function."
+  (concat
+   "("
+   (mapconcat #'notmuch-tagger-make-body-link tags " ")
+   ")"))
+
 (provide 'notmuch-tagger)
 ;;; notmuch-tagger.el ends here
-- 
1.7.10.4