Use twig's {% spaceless %} tag only under certain conditions

Question

Is there a way to use Twig's {% spaceless %} tag only under certain conditions?

For example, say you wanted the HTML to be spaceless in the live environment but wanted it uncompressed in the dev environment. I tried something like:

{% if isDev %}
    {% spaceless %}
{% endif %}
{# Some code... #}
{% if isDev %}
    {% endspaceless %}
{% endif %}

But this just throws a Twig error.

Answer 1

Yes, Twig (sometimes) complains if you're splitting tags which belong together into different conditionals, I ran into that issue in a similar situation.

But as already noted in the comments, I'm also curious why you want to split the spaceless tag. If it's about minifying HTML, the tag isn't very efficient anyways and I'd recommend to use something like Andrew Welch's Minify plugin instead.

Answer 2

You could do it by buffering your output, i.e.

{% set output %}
{# Your code here #}
{% endset %}

{% if isDev %}
     {{ output }}
{% else %}
    {% spaceless %}
        {{ output }}
    {% endspaceless %}
{% endif %}