+ (when (and (consp (car cont))
+ (= (length cont) 1)
+ (fboundp 'libxml-parse-html-region)
+ (equal (cdr (assq 'type (car cont))) "text/html"))
+ (setq cont (mml-expand-html-into-multipart-related (car cont))))
+ (prog1
+ (mm-with-multibyte-buffer
+ (setq message-options options)
+ (cond
+ ((and (consp (car cont))
+ (= (length cont) 1))
+ (mml-generate-mime-1 (car cont)))
+ ((eq (car cont) 'multipart)
+ (mml-generate-mime-1 cont))
+ (t
+ (mml-generate-mime-1
+ (nconc (list 'multipart (cons 'type (or multipart-type "mixed")))
+ cont))))
+ (setq options message-options)
+ (buffer-string))
+ (setq message-options options)))))
+
+(defun mml-expand-html-into-multipart-related (cont)
+ (let ((new-parts nil)
+ (cid 1))
+ (mm-with-multibyte-buffer
+ (insert (cdr (assq 'contents cont)))
+ (goto-char (point-min))
+ (with-syntax-table mml-syntax-table
+ (while (re-search-forward "<img\\b" nil t)
+ (goto-char (match-beginning 0))
+ (let* ((start (point))
+ (img (nth 2
+ (nth 2
+ (libxml-parse-html-region
+ (point) (progn (forward-sexp) (point))))))
+ (end (point))
+ (parsed (url-generic-parse-url (cdr (assq 'src (cadr img))))))
+ (when (and (null (url-type parsed))
+ (url-filename parsed)
+ (file-exists-p (url-filename parsed)))
+ (goto-char start)
+ (when (search-forward (url-filename parsed) end t)
+ (let ((cid (format "fsf.%d" cid)))
+ (replace-match (concat "cid:" cid) t t)
+ (push (list cid (url-filename parsed)) new-parts))
+ (setq cid (1+ cid)))))))
+ ;; We have local images that we want to include.
+ (if (not new-parts)
+ (list cont)
+ (setcdr (assq 'contents cont) (buffer-string))
+ (setq cont
+ (nconc (list 'multipart (cons 'type "related"))
+ (list cont)))
+ (dolist (new-part (nreverse new-parts))
+ (setq cont
+ (nconc cont
+ (list `(part (type . "image/png")
+ (filename . ,(nth 1 new-part))
+ (id . ,(concat "<" (nth 0 new-part)
+ ">")))))))
+ cont))))