{# Rekursives TOC: beliebige Verschachtelungstiefe, eine Quelle der Wahrheit. #}
{% macro toc_entries(nodes) %}
  <ul class="toc-list">
    {% for node in nodes %}
      {% if node.is_part %}
        <li class="toc-item toc-item-part">
          <a href="#part-{{ node.slug }}" class="toc-link">{{ node.title }}</a>
          {% if node.children %}
            {{ toc_entries(node.children) }}
          {% endif %}
        </li>
      {% else %}
        <li class="toc-item toc-item-h{{ node.level }}">
          <a href="#{{ node.slug }}" class="toc-link">
            {% if node.number %}{{ node.number }} {% endif %}{{ node.title }}
          </a>
          {% if node.children %}
            {{ toc_entries(node.children) }}
          {% endif %}
        </li>
      {% endif %}
    {% endfor %}
  </ul>
{% endmacro %}

{{ toc_entries(toc_tree) }}