{#- ensure that grains pillar exists -#}
{%- if pillar['grains'] is defined -%}
  {#- loop through grains -#}
  {%- for key, value in pillar['grains'].items() recursive -%}
    {%- set depth=loop.depth %}
{% for i in range(1,depth) -%}{{ "  " }}{%- endfor -%}
{{ key }}:
    {%- if value is mapping -%}
      {{ loop(value.items()) }}
    {%- else %}
      {%- if value is not none -%}
        {%- for item in value %}
{% for i in range(0,depth) -%}{{ "  " }}{%- endfor -%}
- {{ item }}
        {%- endfor -%}
      {%- endif -%}
    {%- endif -%}
  {%- endfor -%}
{%- endif -%}