I know that dashes let you adjust newlines, but I can't figure out where to
put dashes to get the result I want.
I tried adding dashes like this:
{{ f(x) -}}
{{ f(x) | indent(0) -}}
{{ f(x) | indent(4) -}}
That works for the first macro call, but for the second and third:
- The empty list case is fine (I get zero lines of output)
- The non-empty list case is messed up. I get fewer newlines than I need.
I basically just want a macro to show the elements of a list, one per
line. Any way to do that?
On Thu, Sep 1, 2016 at 1:11 PM, John Robson wrote:
> Use dash "{%- -%}"
>
> http://jinja.pocoo.org/docs/dev/templates/#whitespace-control
>
>
> On 08/26/2016 09:00 PM, Kannan Goundan wrote:
>
>> 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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