From af13765c1154f9eaa9b25e69e2565227f896ae48 Mon Sep 17 00:00:00 2001
From: Lars Magne Ingebrigtsen <larsi@quimbies.gnus.org>
Date: Tue, 5 Oct 2010 20:22:19 +0200
Subject: [PATCH] Allow displaying cid: images from shr.el.

---
 lisp/ChangeLog    |  4 ++++
 lisp/mm-decode.el |  5 +++++
 lisp/shr.el       | 20 +++++++++++++++++---
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 0532694aa..86a155494 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,9 @@
 2010-10-05  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
+	* mm-decode.el (mm-shr): Bind shr-content-function.
+
+	* shr.el (shr-content-function): New variable.
+
 	* gnus-sum.el (gnus-article-sort-by-most-recent-date): New function,
 	added for symmetry.
 
diff --git a/lisp/mm-decode.el b/lisp/mm-decode.el
index 3db539e2f..28339d769 100644
--- a/lisp/mm-decode.el
+++ b/lisp/mm-decode.el
@@ -1687,6 +1687,11 @@ If RECURSIVE, search recursively."
   (let ((article-buffer (current-buffer))
 	(shr-blocked-images (with-current-buffer gnus-summary-buffer
 			      gnus-blocked-images))
+	(shr-content-function (lambda (id)
+				(let ((handle (mm-get-content-id id)))
+				  (when handle
+				    (mm-with-part handle
+				      (buffer-string))))))
 	charset)
     (unless handle
       (setq handle (mm-dissect-buffer t)))
diff --git a/lisp/shr.el b/lisp/shr.el
index 18dd72dfe..fe228135c 100644
--- a/lisp/shr.el
+++ b/lisp/shr.el
@@ -52,6 +52,11 @@ fit these criteria."
   :group 'shr
   :type 'regexp)
 
+(defvar shr-content-function nil
+  "If bound, this should be a function that will return the content.
+This is used for cid: URLs, and the function is called with the
+cid: URL as the argument.")
+
 (defvar shr-folding-mode nil)
 (defvar shr-state nil)
 (defvar shr-start nil)
@@ -205,6 +210,14 @@ redirects somewhere else."
       (when (zerop (length alt))
 	(setq alt "[img]"))
       (cond
+       ((and (not shr-inhibit-images)
+	     (string-match "\\`cid:" url))
+	(let ((url (substring url (match-end 0)))
+	      image)
+	  (if (or (not shr-content-function)
+		  (not (setq image (funcall shr-content-function url))))
+	      (insert alt)
+	    (shr-put-image image (point) alt))))
        ((or shr-inhibit-images
 	    (and shr-blocked-images
 		 (string-match shr-blocked-images url)))
@@ -570,8 +583,8 @@ Return a string with image data."
 			   (string-match "\\([0-9]+\\)%" width))
 		  (aset columns i
 			(/ (string-to-number (match-string 1 width))
-			   100.0)))))
-	    (setq i (1+ i))))))
+			   100.0))))
+	      (setq i (1+ i)))))))
     columns))
 
 (defun shr-count (cont elem)
@@ -585,7 +598,8 @@ Return a string with image data."
   (let ((max 0))
     (dolist (row cont)
       (when (eq (car row) 'tr)
-	(setq max (max max (shr-count (cdr row) 'td)))))
+	(setq max (max max (+ (shr-count (cdr row) 'td)
+			      (shr-count (cdr row) 'th))))))
     max))
 
 (provide 'shr)
-- 
2.25.1