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From: Mark Walters <markwalters1009@gmail.com>
To: notmuch@notmuchmail.org, Austin Clements <aclements@csail.mit.edu>,
	Adam Wolfe Gordon <awg+notmuch@xvx.ca>
Subject: [PATCH v3 3/5] emacs: show: pass button to create-overlays
Date: Fri, 31 May 2013 19:26:44 +0100
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Now that the bodypart code has the button we can pass that to
create-overlays and simplify that.
---
 emacs/notmuch-show.el |   26 ++++++++++++--------------
 1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index be3aeac..66cc3a5 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -851,21 +851,19 @@ message at DEPTH in the current thread."
       (setq handlers (cdr handlers))))
   t)
 
-(defun notmuch-show-create-part-overlays (msg beg end hide)
+(defun notmuch-show-create-part-overlays (button beg end hide)
   "Add an overlay to the part between BEG and END"
-  (let* ((button (button-at beg))
-	 (part-beg (and button (1+ (button-end button)))))
-
-    ;; If the part contains no text we do not make it toggleable. We
-    ;; also need to check that the button is a genuine part button not
-    ;; a notmuch-wash button.
-    (when (and button (/= part-beg end) (button-get button :base-label))
-      (button-put button 'overlay (make-overlay part-beg end))
-      ;; We toggle the button for hidden parts as that gets the
+
+  ;; If there is no button (i.e., the part is text/plain and the first
+  ;; part) or if the part has no content then we don't make the part
+  ;; toggleable.
+  (when (and button (/= beg end))
+    (button-put button 'overlay (make-overlay beg end))
+    ;; We toggle the button for hidden parts as that gets the
       ;; button label right.
       (save-excursion
 	(when hide
-	  (notmuch-show-toggle-part-invisibility button))))))
+	  (notmuch-show-toggle-part-invisibility button)))))
 
 (defun notmuch-show-insert-bodypart (msg part depth &optional hide)
   "Insert the body part PART at depth DEPTH in the current thread.
@@ -879,10 +877,10 @@ If HIDE is non-nil then initially hide this part."
 			     "text/x-diff")
 			content-type))
 	 (nth (plist-get part :id))
-	 (beg (point))
 	 ;; We omit the part button for the first (or only) part if this is text/plain.
 	 (button (unless (and (string= mime-type "text/plain") (<= nth 1))
-		   (notmuch-show-insert-part-header nth mime-type content-type (plist-get part :filename)))))
+		   (notmuch-show-insert-part-header nth mime-type content-type (plist-get part :filename))))
+	 (beg (point)))
 
     (notmuch-show-insert-bodypart-internal msg part mime-type nth depth button)
     ;; Some of the body part handlers leave point somewhere up in the
@@ -891,7 +889,7 @@ If HIDE is non-nil then initially hide this part."
     ;; Ensure that the part ends with a carriage return.
     (unless (bolp)
       (insert "\n"))
-    (notmuch-show-create-part-overlays msg beg (point) hide)))
+    (notmuch-show-create-part-overlays button beg (point) hide)))
 
 (defun notmuch-show-insert-body (msg body depth)
   "Insert the body BODY at depth DEPTH in the current thread."
-- 
1.7.10.4