+;;; Bookmark support for Gnus.
+(declare-function bookmark-make-record-default
+ "bookmark" (&optional no-file no-context posn))
+(declare-function bookmark-prop-get "bookmark" (bookmark prop))
+(declare-function bookmark-default-handler "bookmark" (bmk))
+(declare-function bookmark-get-bookmark-record "bookmark" (bmk))
+(defvar bookmark-yank-point)
+(defvar bookmark-current-buffer)
+
+(defun gnus-summary-bookmark-make-record ()
+ "Make a bookmark entry for a Gnus summary buffer."
+ (let (pos buf)
+ (unless (and (derived-mode-p 'gnus-summary-mode) gnus-article-current)
+ (save-restriction ; FIXME is it necessary to widen?
+ (widen) (setq pos (point))) ; Set position in gnus-article buffer.
+ (setq buf "art") ; We are recording bookmark from article buffer.
+ (setq bookmark-yank-point (point))
+ (setq bookmark-current-buffer (current-buffer))
+ (gnus-article-show-summary)) ; Go back in summary buffer.
+ ;; We are now recording bookmark from summary buffer.
+ (unless buf (setq buf "sum"))
+ (let* ((subject (elt (gnus-summary-article-header) 1))
+ (grp (car gnus-article-current))
+ (art (cdr gnus-article-current))
+ (head (gnus-summary-article-header art))
+ (id (mail-header-id head)))
+ `(,subject
+ ,@(condition-case nil
+ (bookmark-make-record-default 'no-file 'no-context pos)
+ (wrong-number-of-arguments
+ (bookmark-make-record-default 'point-only)))
+ (location . ,(format "Gnus-%s %s:%d:%s" buf grp art id))
+ (group . ,grp) (article . ,art)
+ (message-id . ,id) (handler . gnus-summary-bookmark-jump)))))
+
+;;;###autoload
+(defun gnus-summary-bookmark-jump (bookmark)
+ "Handler function for record returned by `gnus-summary-bookmark-make-record'.
+BOOKMARK is a bookmark name or a bookmark record."
+ (let ((group (bookmark-prop-get bookmark 'group))
+ (article (bookmark-prop-get bookmark 'article))
+ (id (bookmark-prop-get bookmark 'message-id))
+ (buf (car (split-string (bookmark-prop-get bookmark 'location)))))
+ (gnus-fetch-group group (list article))
+ (gnus-summary-insert-cached-articles)
+ (gnus-summary-goto-article id nil 'force)
+ ;; FIXME we have to wait article buffer is ready (only large buffer)
+ ;; Is there a better solution to know that?
+ ;; If we don't wait `bookmark-default-handler' will have no chance
+ ;; to set position. However there is no error, just wrong pos.
+ (sit-for 1)
+ (when (string= buf "Gnus-art")
+ (other-window 1))
+ (bookmark-default-handler
+ `(""
+ (buffer . ,(current-buffer))
+ . ,(bookmark-get-bookmark-record bookmark)))))
+