dokucama

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JINYA
It uses a template file (jinja) and a templating code (in python) but it might be easier to use Ansible instead of the python code (see External Link).
All the links plus a tutorial can be found here
Note that, in Ansible, ROLES are the ones that generate the configurations, Roles are made up of a task and one or more template file.
VARIABLE

  time-zone {{ location.time_zone }};

FOR LOOP

  {% for name_server in location.name_servers %}
      {{ name_server }};
  {% endfor %}

IF STATEMENTS

{% if item[0] is short_caption %}
{# do something here #}
{% endif %}

INCLUDING CONTENT OF FILES IN THE RENDERED TEMPLATE:

system{
  {% include "login.j2" %}
  {% include "services.j2" %}
}

INCLUDING BLOCKS:
Note that this is the parent configuration, having the section inside the block 'elegible' to be overriden.

services {
  ssh;
   {% block dhcp %}
  dhcp{
    pool 0.0.0.0/0;
  }
   {% endblock dhcp %}
}