+ (let ((button (or button (button-at (point)))))
+ (when button
+ (let ((overlay (button-get button 'overlay))
+ (lazy-part (button-get button :notmuch-lazy-part)))
+ ;; We have a part to toggle if there is an overlay or if there
+ ;; is a lazy part. If neither is present we cannot toggle the
+ ;; part so we just return nil.
+ (when (or overlay lazy-part)
+ (let* ((show (button-get button :notmuch-part-hidden))
+ (new-start (button-start button))
+ (button-label (button-get button :base-label))
+ (old-point (point))
+ (properties (text-properties-at (button-start button)))
+ (inhibit-read-only t))
+ ;; Toggle the button itself.
+ (button-put button :notmuch-part-hidden (not show))
+ (goto-char new-start)
+ (insert "[ " button-label (if show " ]" " (hidden) ]"))
+ (set-text-properties new-start (point) properties)
+ (let ((old-end (button-end button)))
+ (move-overlay button new-start (point))
+ (delete-region (point) old-end))
+ (goto-char (min old-point (1- (button-end button))))
+ ;; Return nil if there is a lazy-part, it is empty, and we are
+ ;; trying to show it. In all other cases return t.
+ (if lazy-part
+ (when show
+ (button-put button :notmuch-lazy-part nil)
+ (notmuch-show-lazy-part lazy-part button))
+ ;; else there must be an overlay.
+ (overlay-put overlay 'invisible (not show))
+ t)))))))
+
+;; Part content ID handling
+
+(defvar notmuch-show--cids nil
+ "Alist from raw content ID to (MSG PART).")
+(make-variable-buffer-local 'notmuch-show--cids)
+
+(defun notmuch-show--register-cids (msg part)
+ "Register content-IDs in PART and all of PART's sub-parts."
+ (let ((content-id (plist-get part :content-id)))
+ (when content-id
+ ;; Note that content-IDs are globally unique, except when they
+ ;; aren't: RFC 2046 section 5.1.4 permits children of a
+ ;; multipart/alternative to have the same content-ID, in which
+ ;; case the MUA is supposed to pick the best one it can render.
+ ;; We simply add the content-ID to the beginning of our alist;
+ ;; so if this happens, we'll take the last (and "best")
+ ;; alternative (even if we can't render it).
+ (push (list content-id msg part) notmuch-show--cids)))
+ ;; Recurse on sub-parts
+ (let ((ctype (notmuch-split-content-type
+ (downcase (plist-get part :content-type)))))
+ (cond ((equal (car ctype) "multipart")
+ (mapc (apply-partially #'notmuch-show--register-cids msg)
+ (plist-get part :content)))
+ ((equal ctype '("message" "rfc822"))
+ (notmuch-show--register-cids
+ msg
+ (car (plist-get (car (plist-get part :content)) :body)))))))
+
+(defun notmuch-show--get-cid-content (cid)
+ "Return a list (CID-content content-type) or nil.
+
+This will only find parts from messages that have been inserted
+into the current buffer. CID must be a raw content ID, without
+enclosing angle brackets, a cid: prefix, or URL encoding. This
+will return nil if the CID is unknown or cannot be retrieved."
+ (let ((descriptor (cdr (assoc cid notmuch-show--cids))))
+ (when descriptor
+ (let* ((msg (car descriptor))
+ (part (cadr descriptor))
+ ;; Request caching for this content, as some messages
+ ;; reference the same cid: part many times (hundreds!).
+ (content (notmuch-get-bodypart-binary
+ msg part notmuch-show-process-crypto 'cache))
+ (content-type (plist-get part :content-type)))
+ (list content content-type)))))
+
+(defun notmuch-show-setup-w3m ()
+ "Instruct w3m how to retrieve content from a \"related\" part of a message."
+ (interactive)
+ (when (and (boundp 'w3m-cid-retrieve-function-alist)
+ (not (assq 'notmuch-show-mode w3m-cid-retrieve-function-alist)))
+ (push (cons 'notmuch-show-mode #'notmuch-show--cid-w3m-retrieve)
+ w3m-cid-retrieve-function-alist))
+ (setq mm-html-inhibit-images nil))
+
+(defvar w3m-current-buffer) ;; From `w3m.el'.
+(defun notmuch-show--cid-w3m-retrieve (url &rest args)
+ ;; url includes the cid: prefix and is URL encoded (see RFC 2392).
+ (let* ((cid (url-unhex-string (substring url 4)))
+ (content-and-type
+ (with-current-buffer w3m-current-buffer
+ (notmuch-show--get-cid-content cid))))
+ (when content-and-type
+ (insert (car content-and-type))
+ (cadr content-and-type))))
projects / notmuch / blobdiff