Ansible append multiple templates to a single file - linux

Question

How can I append multiple templates to a single file depending on a variable.
I have 3 variables vara, varb, varc. And their true/false determine whether I can use template1, template2, template3.
Their can be multiple permutations of these three files.
So what should be best strategy to append these templates in a single file.
Eg: if vara is true, varb is false, varc is true.
Then output file should contain template1 and template3.

Answer 1

If you are putting all of this in a single output file, you should only use one template, but put your if elsif logic in the template itself.
{% if vara == true %}
text1
{% elif varb == true %}
text2
{% elif varc == true %}
text3
{% endif %}

Answer 2

Q: "Eg: if vara is true, varb is false, varc is true. Then output file should contain template1 and template3."
A: It's possible to use lookup and template plugin. For example
shell> cat test.j2
{% if vara %}{{ lookup('template', 'template1.j2') }}{% endif %}
{% if varb %}{{ lookup('template', 'template2.j2') }}{% endif %}
{% if varc %}{{ lookup('template', 'template3.j2') }}{% endif %}
shell> cat template1.j2
vara: {{ vara }}
shell> cat template2.j2
varb: {{ varb }}
shell> cat template3.j2
varc: {{ varc }}
- hosts: localhost
vars:
vara: true
varb: false
varc: true
tasks:
- template:
src: test.j2
dest: test.txt
give
shell> cat test.txt
vara: True
varc: True

Answer 3

This would cause each template to be copied if its corresponding variable is true without the need of extra Jinja2 templating
- name: copy template
template:
src: "{{ item.name }}"
dest: /my/dest/dir/
when: item.state ## this is a simplified version of "when item.state == True"
loop:
- vara_template: "{ name: 'template1', state: vara }"
- varb_template: "{ name: 'template2', state: varb }"
- varc_template: "{ name: 'template3', state: varc }"