<a{% for attr, value in options | merge({class: 'btn btn-secondary mx-2 px-0'}) %} {{ attr }}="{{ value }}"{% endfor %}> <span class="float-right"> {% if sorted %} {% if direction == 'desc' %} <i class="fa fa-sort-down"></i> {% else %} <i class="fa fa-sort-up"></i> {% endif %} {% else %} <i class="fa fa-sort"></i> {% endif %} </span> {{ title }}</a>