{% for nav_item in nav %}
  • {{ nav_item.title }} {% if nav_item == current_page %}
      {% for toc_item in toc %}
    • {{ toc_item.title }}
    • {% for toc_item in toc_item.children %}
    • {{ toc_item.title }}
    • {% endfor %} {% endfor %}
    {% endif %}
  • {% endfor %}