Move the determination of whether a part header is required to a
distinct function.
---
 emacs/notmuch-show.el | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 10fc872..ec99141 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -871,6 +871,21 @@ message at DEPTH in the current thread."
       ;; showable this returns nil.
       (notmuch-show-create-part-overlays button part-beg part-end))))

+(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)
+  "Return non-NIL if a header button should be inserted for this part."
+  (let ((mime-type (notmuch-show-mime-type part)))
+    (not (and (string= mime-type "text/plain")
+             (<= (plist-get part :id) 1)))))
+
 (defun notmuch-show-insert-bodypart (msg part depth &optional hide)
   "Insert the body part PART at depth DEPTH in the current thread.

@@ -881,19 +896,15 @@ is t, hide the part initially and show the button. If 
HIDE is
 useful for quoting in replies)."

   (let* ((content-type (downcase (plist-get part :content-type)))
-        (mime-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))
+        (mime-type (notmuch-show-mime-type part))
         (nth (plist-get part :id))
         (beg (point))
         ;; Hide the part initially if HIDE is t.
         (show-part (not (equal hide t)))
         ;; We omit the part button for the first (or only) part if
         ;; this is text/plain, or HIDE is 'no-buttons.
-        (button (unless (or (equal hide 'no-buttons)
-                            (and (string= mime-type "text/plain") (<= nth 1)))
+        (button (when (and (not (equal hide 'no-buttons))
+                           (notmuch-show-insert-header-p part))
                   (notmuch-show-insert-part-header nth mime-type content-type 
(plist-get part :filename))))
         (content-beg (point)))

-- 
2.0.0.rc0

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