[PATCH] emacs: Work around gnus-inhibit-images bug in mm-shr

[Austin Clements <amdragon@MIT.EDU>]

Emacs 24's mm-shr HTML email renderer fails to load gnus-art before
referencing gnus-inhibit-images, resulting in a void-variable error
when notmuch attempts to render an HTML email with inline images.
This works around this bug by advising mm-shr to load gnus-art.

mm-shr is the only function outside of gnus-art itself that references
gnus-inhibit-images, so this workaround should be correct.  If this
ever changes, hopefully they will have fixed this bug upstream first.

This fixes the "Rendering HTML mail with images" test for Emacs 24.
---

This is an alternate fix to the one provided in patch 3/3.

 emacs/notmuch-lib.el |   13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/emacs/notmuch-lib.el b/emacs/notmuch-lib.el
index 20d990d..69867ad 100644
--- a/emacs/notmuch-lib.el
+++ b/emacs/notmuch-lib.el
@@ -254,6 +254,19 @@ the given type."
   (or (plist-get part :content)
       (notmuch-get-bodypart-internal (notmuch-id-to-query (plist-get msg :id)) nth process-crypto)))
 
+;; Workaround: The call to `mm-display-part' below triggers a bug in
+;; Emacs 24 if it attempts to use the shr renderer to display an HTML
+;; part with images in it (demonstrated in 24.1 and 24.2 on Debian and
+;; Fedora 17, though unreproducable in other configurations).
+;; `mm-shr' references the variable `gnus-inhibit-images' without
+;; first loading gnus-art, which defines it, resulting in a
+;; void-variable error.  Hence, we advise `mm-shr' to ensure gnus-art
+;; is loaded.
+(if (>= emacs-major-version 24)
+    (defadvice mm-shr (before load-gnus-arts activate)
+      (require 'gnus-art nil t)
+      (ad-disable-advice 'mm-shr 'before 'load-gnus-arts)))
+
 (defun notmuch-mm-display-part-inline (msg part nth content-type process-crypto)
   "Use the mm-decode/mm-view functions to display a part in the
 current buffer, if possible."
-- 
1.7.10