def show_pageitems(_, token):
    """Show page items.

    Usage:

    .. code-block:: html+django

        {% show_pageitems per_page %}

    """
    # Validate args.
    if len(token.contents.split()) != 1:
        msg = '%r tag takes no arguments' % token.contents.split()[0]
        raise template.TemplateSyntaxError(msg)
    # Call the node.
    return ShowPageItemsNode()