+(defun notmuch-show-mime-type (part)
+ "Return the correct mime-type to use for PART."
+ (let ((content-type (downcase (plist-get part :content-type))))
+ (or (and (string= content-type "application/octet-stream")
+ (notmuch-show-get-mime-type-of-application/octet-stream part))
+ (and (string= content-type "inline patch")
+ "text/x-diff")
+ content-type)))
+
+(defun notmuch-show-insert-header-p (part hide)
+ "Return non-NIL if a header button should be inserted for this part."
+ ;; Show all part buttons except for the first part if it is text/plain.
+ (let ((mime-type (notmuch-show-mime-type part)))
+ (not (and (string= mime-type "text/plain")
+ (<= (plist-get part :id) 1)))))
+