{# render meta links #}
{% macro meta_item(name, href, text) %}
  <tr>
    <td>
      <strong>{{ name }}</strong>
    </td>
    <td>
      <a href="{{ href }}">{{ text }}</a>
    </td>
  </tr>
{% endmacro %}
{# render navbar item #}
{% macro nav_item(name, url) %}
  <a {% if current_url and url == current_url %}class="active"{% endif %} href={{ url }}>{{ name }}</a>
{% endmacro %}
{# render table of contents recursively #}
{% macro toc_item(item, depth=0) %}
  <li>
    <a href="{{ item.permalink | safe }}">{{ item.title }}</a>
    {% if depth < 6 and item.children %}
      <ul>
        {% for child in item.children %}{{ self::toc_item(item=child, depth=depth + 1) }}{% endfor %}
      </ul>
    {% endif %}
  </li>
{% endmacro %}
{# render table of contents #}
{% macro toc(toc) %}
  {%- set len = toc | length -%}
  {% if len > 1 %}
    <nav>
      <ul>
        {% for child in toc %}{{ self::toc_item(item=child) }}{% endfor %}
      </ul>
    </nav>
  {% endif %}
{% endmacro %}
{# render content header #}
{% macro header(item, link=true) %}
  <header>
    <hgroup>
      <h1>
        {% if not link or not item.permalink %}
          {{ item.title }}
        {% elif item.extra.external %}
          <a href="{{ item.extra.external }}">{{ item.title }}</a>
        {% else %}
          <a href="{{ item.permalink }}">{{ item.title }}</a>
        {% endif %}
      </h1>
      <p>{{ item.description }}</p>
    </hgroup>
    {% if item.taxonomies["tags"] %}
      <nav>
        {% for tag in item.taxonomies["tags"] %}
          <a href={{ get_taxonomy_url(kind="tags", name=tag) }}>#{{ tag }}</a>
        {% endfor %}
      </nav>
    {% endif %}
  </header>
  {% if item.date or item.authors %}
    <footer>
      <p>
        Posted
        {% if item.date %}
          on
          <time pubdate datetime="{{ item.date | date(format="%Y-%m-%d") }}">
            {{ item.date | date(format="%d %b %Y") }}
          </time>
        {% endif %}
        {% if item.authors %}
          <span>
            <address>
              by
              {{ item.authors | join(sep=", ") }}
            </address>
          </span>
        {% endif %}
        {% if item.updated %}
          <time datetime="{{ item.updated | date(format="%Y-%m-%d") }}">
            (Edited: {{ item.updated | date(format="%d %b %Y") }})
          </time>
        {% endif %}
      </p>
    </footer>
  {% endif %}
{% endmacro %}