menu looping over Grav pages

gistfile1.twig

{% macro loop(page) %}
    {% for p in page.children %}
        {% if p.visible %}
        <li>
            <a href="{{ p.url }}">{{ p.menu }}</a>
            {% if p.children.count > 0 %}
            <ul>
                {{ _self.loop(p) }}
            </ul>
            {% endif %}
        </li>
        {% endif %}
    {% endfor %}
{% endmacro %}

<ul class="topics">
    {{ _self.loop(pages) }}
</ul>