def breadcrumbs(category_string, separator=' > ', using='categories.category'):
    """
    {% breadcrumbs category separator="::" using="categories.category" %}

    Render breadcrumbs, using the ``categories/breadcrumbs.html`` template,
    using the optional ``separator`` argument.
    """
    cat = get_category(category_string, using)

    return {'category': cat, 'separator': separator}
{% breadcrumbs category separator="::" using="categories.category" %}

    Render breadcrumbs, using the ``categories/breadcrumbs.html`` template,
    using the optional ``separator`` argument.