{% macro render_tree(nodes, selected=None, manage=false) %}
  <ul class="category-tree">
  {% for node in nodes %}
    <li{% if node.in_selected_path %} class="in-selected-path"{% endif %}>
      {% if node.exists %}
        <a class="tree-link{% if node.name == selected %} active{% endif %}"
           href="{{ url_for('index', category=node.name) }}"
           {% if node.name == selected %}aria-current="page"{% endif %}
           {% if node.category.description %}title="{{ node.category.description }}"{% endif %}>{{ node.label }}</a>
      {% else %}
        <span class="tree-parent">{{ node.label }}</span>
      {% endif %}
      {% if manage and node.exists %}
        <a class="tree-edit" href="{{ url_for('edit_category', name=node.name) }}">Edit</a>
        {% if node.category.description %}<small>{{ node.category.description }}</small>{% endif %}
      {% endif %}
      {% if node.children %}{{ render_tree(node.children, selected, manage) }}{% endif %}
    </li>
  {% endfor %}
  </ul>
{% endmacro %}