On Wed, Jun 09 2010, Tassilo Horn wrote:

> (defvar th-notify-body-to-id-map (make-hash-table :test 'string=)
>   "Maps BODY values of notifications to the last notification ID.
> If ID is -1, then any further notifications with that body will
> be skipped.")
>
> (defun th-notify (&rest args)
>   "Create a notification popup.
> For ARGS, see `notifications-notify'.
> If there was a notification with the same BODY before, that one
> will be replaced by the current notification."
>   (require 'notifications)
>   (let* ((body (plist-get args :body))
>          (replace-id (or (gethash body th-notify-body-to-id-map)
>                          (plist-get args :replaces-id))))
>     (unless (eql replace-id -1)
>       (puthash
>        body
>        (apply 'notifications-notify
>               (plist-put (plist-put args :replaces-id replace-id)
>                          :timeout 0))
>        th-notify-body-to-id-map))))

What about adding:

  :on-close
  `(lambda (reason)
      (when (eq reason 'dismissed)
         (puthash ,body -1 th-notify-body-to-id-map)))

in `args' ?

-- 
Julien Danjou
// ᐰ <julien@danjou.info>   http://julien.danjou.info