apt-formula/apt/templates/apt_conf.jinja

{%- macro print(mname, mvalue) %}
  {%- if mvalue is string %}
  {{ mname }} "{{ mvalue }}";
  {%- elif mvalue is sequence %}
  {{ mname }} {
    {%- for item in mvalue %}
    "{{ item }}";
    {%- endfor %}
  };
  {%- endif %}
{%- endmacro -%}
// This file is managed by salt
{%- for opt, opt_data in data|dictsort -%}
  {%- if opt_data is string %}
{{ opt }} "{{ opt_data }}";
  {%- elif opt_data is mapping %}
{{ opt }}
{
    {%- for name, value in opt_data|dictsort %}
  {{- print(name, value) }}
    {%- endfor %}
};
  {%- elif opt_data is sequence %}
{{ opt }} {
    {%- for item in opt_data %}
  "{{ item }}";
    {%- endfor %}
};
  {%- endif %}
{%- endfor -%}