Nunjucks Alerts Macros

alerts.njk

{% macro alerts() %}
	{% set types = ['success', 'error', 'info', 'warning'] %}

	{% for type in types %}
		{% if( old(type) ) %}
			<p class="alert alert-{%  if type == 'error' %}danger{% else %}{{type}}{% endif %}">{{ old(type) }}</p>
		{% endif %}
	{% endfor %}
{% endmacro %}