+(defvar notmuch-show-multipart/alternative-discouraged
+ '(
+ ;; Avoid HTML parts.
+ "text/html"
+ ;; multipart/related usually contain a text/html part and some associated graphics.
+ "multipart/related"
+ ))
+
+(defun notmuch-show-multipart/*-to-list (part)
+ (mapcar '(lambda (inner-part) (plist-get inner-part :content-type))
+ (plist-get part :content)))
+
+(defun notmuch-show-multipart/alternative-choose (types)
+ ;; Based on `mm-preferred-alternative-precedence'.
+ (let ((seq types))
+ (dolist (pref (reverse notmuch-show-multipart/alternative-discouraged))
+ (dolist (elem (copy-sequence seq))
+ (when (string-match pref elem)
+ (setq seq (nconc (delete elem seq) (list elem))))))
+ seq))
+