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Whitespace control
Every line of code in a Liquid template produces an LF character at the end of a line. This applies also to lines that don't produce any text.
Controlling whitespace characters, especially newline characters, is crucial in the CSV format.
You can include a hyphen in your tag syntax {{-, -}}, {%-, and -%} to strip whitespace from the left or right side of a rendered tag.
Placing a hyphen in the opening tag {{- or {%- removes also a newline character at the one of a previous line.
For example:
Liquid Code
{% for item in order.line_items %}
{{ item.title }}
{% endfor %}
produces the following output (assuming that the order contains two line items, a Cap and a T-Shirt):
Output
Cap
T-Shirt
Add hyphens to the for-loop tags will remove the empty lines.
Liquid Code
{%- foritem in order.line_items %}
{{ item.title }}
{%- endfor %}
Output
T-Shirt
Cap
You could place hyphens at the end of the control tags as well to get the same result.
Liquid Code
{% for item in order.line_items -%}
{{ item.title }}
{% endfor -%}
However, adding hyphens at both sides of the for-loop tags would also remove line separators between subsequent items reducing the output to one line.
Liquid Code
{%- for item in order.line_items -%}
{{ item.title }}
{%- endfor -%}
Output
T-ShirtCap
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