{% macro key_image(ref) %}
    {% if ref.key_image %}
    <a class='key_image' href="{{ ref.key_image.src }}">
        <img src="{{ ref.key_image.src|replace('.','_thumb.') }}" alt="{{ ref.key_image.alt}}">
    </a>
    {% endif %}
{% endmacro %}

{% macro table(t, headers=[]) %}
    <table>
        <tr>{% for h in headers %}{% if h %}<th>{{ h }}</th>{% endif %}{% endfor %}</tr>
        {% for key in t %}
            <tr><td>{{ key }}</td>{{ _list_to_cols(t[key], headers) }}</tr>
        {% endfor %}
    </table>
{% endmacro %}

{% macro _list_to_cols(l, headers) %}
    {% if l is mapping %}
        {% for key in l if key in headers%}
            {{ _list_to_cols(l[key], headers) }}
        {% endfor %}
    {% elif l %}
        <td>{{ l }}</td>
    {% endif %}
{% endmacro %}