#20 Join group with completion from bookmarks.

[Constantin Kulikov]

What you think?

:::scheme
(defun jabber-muc-join-group ()
  (interactive)
  (let ((account (jabber-read-account)))
    (jabber-get-bookmarks account
                          #'(lambda (jc bms)
                              (let (groups group nickname)
                                (mapc #'(lambda (b)
                                          (when (eq 'conference (jabber-xml-node-name b))
                                            (push (make-symbol (jabber-xml-get-attribute b 'jid)) groups)))
                                      bms)
                                (setq group (jabber-read-jid-completing "group: " groups)
                                      nickname (jabber-muc-read-my-nickname jc group))
                                (jabber-muc-join jc group nickname))))))