views/macros/button_dropdown.html.twig
{% from 'button_classes.html.twig' import button_classes as button_classes %}
{% macro button_dropdown(color, size, type, extra, label, content) %}
<div class="button-group">
<button type="button" class="dropdown-toggle {{ button_classes(color, size, type) }}" data-toggle="dropdown">
{{ label }} <span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">{{ content }}</ul>
</div>
{% endmacro %}