I'm using Jinja2 to generate Nginx configuration files. I want to make
sure the output is readable, and part of that involves being able to be
precise with blank spaces.
I'm having trouble figuring out how to avoid extra blank spaces when using
a macro. Here's a short example:
import jinja2
print "Jinja2 version", jinja2.__version__
TEMPLATE = r'''
{% macro f(l) -%}
{% for e in l %}
> {{ e }}
{% endfor %}
{%- endmacro %}
-- inline --
{% for e in x %}
> {{ e }}
{% endfor %}
-- f(x) --
{{ f(x) }}
-- f(x) | indent(0) --
{{ f(x) | indent(0) }}
-- f(x) | indent(4) --
{{ f(x) | indent(4) }}
--
'''
t = jinja2.Template(TEMPLATE,
trim_blocks=True,
lstrip_blocks=True,
keep_trailing_newline=True)
print "====== [1, 2] ======"
print t.render(x=[1, 2])
print "====== [] ======"
print t.render(x=[])
And here's the output:
Jinja2 version 2.8
====== [1, 2] ======
-- inline --
> 1
> 2
-- f(x) --
> 1
> 2
-- f(x) | indent(0) --
> 1
> 2
-- f(x) | indent(4) --
> 1
> 2
--
====== [] ======
-- inline --
-- f(x) --
-- f(x) | indent(0) --
-- f(x) | indent(4) --
--
When the list "x" is non-empty, "f(x)" leaves an extra blank line. This is
strange, but there's a simple workaround: "f(x) | indent(0)".
When the list "x" is empty, I can't get the blank line to go away. The
only way it works right is if I don't use a macro.
I've tried adding newline suppression marks ("-") in various places but
couldn't get it to work.
I tried surrounding the macro call with a useless "if":
{% if 1 %}{{ f(x) }}{% endif %}
That eliminated the blank line in the empty list case, but screwed up the
indentation in the non-empty list case.
Any ideas?
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