[PATCH] emacs: Add a defcustom that specifies regexp for blocked remote images.

[Jinwoo Lee]

It's default value is ".", meaning all remote images will be blocked
by default.

---
This time setting gnus-blocked-images from the correct place.
---
 emacs/notmuch-show.el | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 66350d4..6f38e0c 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -136,6 +136,11 @@ indentation."
   :type 'boolean
   :group 'notmuch-show)
 
+(defcustom notmuch-show-text/html-blocked-images "."
+  "Remote images that have URLs matching this regexp will be blocked."
+  :type '(choice (const nil) regexp)
+  :group 'notmuch-show)
+
 (defvar notmuch-show-thread-id nil)
 (make-variable-buffer-local 'notmuch-show-thread-id)
 (put 'notmuch-show-thread-id 'permanent-local t)
@@ -798,16 +803,24 @@ will return nil if the CID is unknown or cannot be retrieved."
 	   ;; URL-decode it (see RFC 2392).
 	   (let ((cid (url-unhex-string url)))
 	     (first (notmuch-show--get-cid-content cid)))))
-	;; Block all external images to prevent privacy leaks and
-	;; potential attacks.  FIXME: If we block an image, offer a
-	;; button to load external images.
-	(shr-blocked-images "."))
+	;; By default, block all external images to prevent privacy
+	;; leaks and potential attacks.  FIXME: If we block an image,
+	;; offer a button to load external images.
+	(shr-blocked-images notmuch-show-text/html-blocked-images))
     (shr-insert-document dom)
     t))
 
 (defun notmuch-show-insert-part-*/* (msg part content-type nth depth button)
   ;; This handler _must_ succeed - it is the handler of last resort.
-  (notmuch-mm-display-part-inline msg part content-type notmuch-show-process-crypto)
+
+  ;; By default, block all external images to prevent privacy leaks
+  ;; and potential attacks.  FIXME: If we block an image, offer a
+  ;; button to load external images.
+  ;; Note that GNUS-BLOCKED-IMAGES is effective only when
+  ;; MM-TEXT-HTML-RENDERER is 'gnus-w3m.
+  (let ((gnus-blocked-images notmuch-show-text/html-blocked-images))
+    (notmuch-mm-display-part-inline msg part content-type
+				    notmuch-show-process-crypto))
   t)
 
 ;; Functions for determining how to handle MIME parts.
-- 
2.2.2