Print a Baum tree with Twig

gistfile1.twig

{% macro menuLinks(root, maxdepth) %}
{% import _self as macros %}
{# print a UL tree #}
{% for link in root.children %}
<li>
    <a href="{{ link.slug }}">{{ link.name }}</a>
    {% if link.children and (maxdepth > link.depth or not maxdepth) %}
    <ul>
        {{ macros.menuLinks(link, maxdepth) }}
    </ul>
    {% endif %}
</li>
{% endfor %}
{% endmacro %}

maxdepth is not mandatory