notmuch.el: Handle attached images via an external viewer.

We temporarily override the mm-inline-media-tests variable so that the
only parts inserted into the temporary buffer (and lost) are those
parts that the user has already seen in the notmuch-show buffer.

Anything else, (such as images), will now be left to be handled via
mailcap, just like other attachment types.

1 files changed, 16 insertions, 1 deletions

diff --git a/notmuch.el b/notmuch.el
index b9095677..040997ee 100644
--- a/notmuch.el
+++ b/notmuch.el
@@ -327,7 +327,22 @@ buffer."
   "Use external viewers to view all attachments from the current message."
   (interactive)
   (with-current-notmuch-show-message
-   (mm-display-parts (mm-dissect-buffer))))
+   ; We ovverride the mm-inline-media-tests to indicate which message
+   ; parts are already sufficiently handled by the original
+   ; presentation of the message in notmuch-show mode. These parts
+   ; will be inserted directly into the temporary buffer of
+   ; with-current-notmuch-show-message and silently discarded.
+   ;
+   ; Any MIME part not explicitly mentioned here will be handled by an
+   ; external viewer as configured in the various mailcap files.
+   (let ((mm-inline-media-tests '(
+				  ("text/.*" ignore identity)
+				  ("application/pgp-signature" ignore identity)
+				  ("multipart/alternative" ignore identity)
+				  ("multipart/mixed" ignore identity)
+				  ("multipart/related" ignore identity)
+				 )))
+     (mm-display-parts (mm-dissect-buffer)))))
 
 (defun notmuch-foreach-mime-part (function mm-handle)
   (cond ((stringp (car mm-handle))