Remove empty lines and don't join non-empty lines in Jinja

I want to make something like the following list of badges look nice:

Badge
{% if cond %}Other badge {% endif %}
Another badge
{% if not cond %}One more badge {% endif %}
Last badge

I am hoping for:

Every badge in its own line
If the badge is not being added, then don't add a blank line

I tried 16 combinations of adding - to the {% or %} delimiters, but I can't achieve both things at once.

More details:

I have a list of conditional badges
The example above is a simplified version that has cond and not cond at the same time so the issue is always present
In real, I don't have an if-else situation, it's only for the MRE

The 16 combinations are

Badge (-,-,-,-)
{%- if cond -%}Other badge {%- endif -%}
Another badge
{%- if not cond -%}One more badge {%- endif -%}
Last badge

Badge (,-,-,-)
{% if cond -%}Other badge {%- endif -%}
Another badge
{% if not cond -%}One more badge {%- endif -%}
Last badge

Badge (-,,-,-)
{%- if cond %}Other badge {%- endif -%}
Another badge
{%- if not cond %}One more badge {%- endif -%}
Last badge

Badge (,,-,-)
{% if cond %}Other badge {%- endif -%}
Another badge
{% if not cond %}One more badge {%- endif -%}
Last badge

Badge (-,-,,-)
{%- if cond -%}Other badge {% endif -%}
Another badge
{%- if not cond -%}One more badge {% endif -%}
Last badge

Badge (,-,,-)
{% if cond -%}Other badge {% endif -%}
Another badge
{% if not cond -%}One more badge {% endif -%}
Last badge

Badge (-,,,-)
{%- if cond %}Other badge {% endif -%}
Another badge
{%- if not cond %}One more badge {% endif -%}
Last badge

Badge (,,,-)
{% if cond %}Other badge {% endif -%}
Another badge
{% if not cond %}One more badge {% endif -%}
Last badge

Badge (-,-,-,)
{%- if cond -%}Other badge {%- endif %}
Another badge
{%- if not cond -%}One more badge {%- endif %}
Last badge

Badge (,-,-,)
{% if cond -%}Other badge {%- endif %}
Another badge
{% if not cond -%}One more badge {%- endif %}
Last badge

Badge (-,,-,)
{%- if cond %}Other badge {%- endif %}
Another badge
{%- if not cond %}One more badge {%- endif %}
Last badge

Badge (,,-,)
{% if cond %}Other badge {%- endif %}
Another badge
{% if not cond %}One more badge {%- endif %}
Last badge

Badge (-,-,,)
{%- if cond -%}Other badge {% endif %}
Another badge
{%- if not cond -%}One more badge {% endif %}
Last badge

Badge (,-,,)
{% if cond -%}Other badge {% endif %}
Another badge
{% if not cond -%}One more badge {% endif %}
Last badge

Badge (-,,,)
{%- if cond %}Other badge {% endif %}
Another badge
{%- if not cond %}One more badge {% endif %}
Last badge

Badge (,,,)
{% if cond %}Other badge {% endif %}
Another badge
{% if not cond %}One more badge {% endif %}
Last badge

which can be pasted in https://j2live.ttl255.com with the variable cond: true (or false) to show what happens

I am using copier, not Jinja directly, if that makes any difference

Related questions:

Jinja2 whitespace controls doesn't work as expected with IF block - seems related, but no answer

Solution

The thing is, the manual whitespace control mechanism treats a range of spacing characters the same, upon those characters are tabulations, spaces and new lines.

For the record, the definition of a whitespace is given in Python's documentation:

A character is whitespace if in the Unicode character database (see unicodedata), either its general category is Zs (“Separator, space”), or its bidirectional class is one of WS, B, or S.

^{Source: https://docs.python.org/3/library/stdtypes.html#str.isspace}

This being said, it means you will probably not find a good one-liner solution, because using a whitespace control character will also chomp your new lines.

The only one I can think of that would make you trick the whitespace control is to print the new line inside a Jinja expression:

Badge
{% if cond %}Other badge{{ "\n" }}{% endif -%}
Another badge
{% if not cond %}One more badge{{ "\n" }}{% endif -%}
Last badge

There are a bunch of other suggestion that are definitely more verbose that you can choose from, though, here are three that I can think of:

Put the new line inside the condition and use a whitespace control on the end of the condition (which is actually kind-of the same as the one-liner):
```
Badge
{% if cond %}Other badge
{% endif -%}
Another badge
{% if not cond %}One more badge
{% endif -%}
Last badge
```

With the use of whitespace controls, you can end up with clear indentation in your conditions:

Badge
{% if cond -%}
    Other badge 
{% endif -%}
Another badge
{% if not cond -%}
    One more badge 
{% endif -%}
Last badge

or keep it flat:

Badge
{% if cond -%}
Other badge 
{% endif -%}
Another badge
{% if not cond -%}
One more badge 
{% endif -%}
Last badge

Without whitespace control characters, you'll have to start your condition on the previous line:

Badge{% if cond %}
Other badge{% endif %}
Another badge{% if not cond %}
One more badge{% endif %}
Last badge

or end the condition on the next line

Badge
{% if cond %}Other badge
{% endif %}Another badge
{% if not cond %}One more badge
{% endif %}Last badge