{% macro source(url) %}
  {% if url != null %}
    <a class="card-header-icon" href="{{ url }}" target="_blank">
      <span class="icon"><i class="fa fa-code"></i></span>
    </a>
  {% endif -%}
{% endmacro %}

{% macro edit(url) %}
  {% if url != null %}
    <a class="card-header-icon" href="{{ url }}" target="_blank">
      <span class="icon"><i class="fa fa-pencil"></i></span>
    </a>
  {% endif -%}
{% endmacro %}