template substitution

[Peter Gray]

If I have in a template file

#

#  {% if i_want_yes %} yes {% else %} no {% endif %}

#

and the variable i_want_yes is True

I seem to get

#

#  yes #

as output. What happened to my newline and how do I get it back?

BTW, I am new to this and I have spent a little time in the jinga2 docs to no avail.

[Johannes Kastl]

On 01.06.16 07:23 Peter Gray wrote:
> If I have in a template file
>
> #
> # {% if i_want_yes %} yes {% else %} no {% endif %}
> #

I normally write it like this:

{% if i_want_yes %}
# yes
{% else %}
# no
{% endif %}

Would that work for you?

Johannes

[Brian Coca]

ansible uses the trim_blocks setting when invoking jinja, by default its 'yes'.

ansible allows for overrides by creating a special header:

```

#jinja2: trim_blocks: False

#
#  {% if i_want_yes %} yes {% else %} no {% endif %}
#

```

----------

Brian Coca

[Peter Gray]

Many thanks for this information. For future reference where is this documented?

The interaction of ansible with jinga2 seems a bit opaque.

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[Josh Smift]

PG> Many thanks for this information. For future reference where is this
PG> documented?

https://groups.google.com/forum/#!topic/ansible-project/qHyIjyal_Ic is a
thread where it came up before, which says

you can use a per template header to override this, you can see an
example in the template docs.

https://docs.ansible.com/template_module.html

which is now at http://docs.ansible.com/ansible/template_module.html, and
which only seems to mention it in a note saying

Since Ansible version 0.9, templates are loaded with trim_blocks=True.

and not any actual examples, or any explanation of what trim_blocks does,
so it could be hard to spot this if you didn't already know what you were
looking for.

PG> The interaction of ansible with jinga2 seems a bit opaque.

That page also doesn't mention
http://docs.ansible.com/ansible/playbooks_filters.html, which I've found
to be super useful in turning up examples of Ansible-specific Jinja filters.

-Josh (j...@care.com)

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