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Most Liquid "filters" are actually "map"s in the functional programming sense: you take an array, you apply a function to each element and return the transformed array. I'd like instead to "filter": I want to return only those items in the array that match a certain condition. How can I do that?
Specifically, I'm trying to improve this template:
Authors:
{% for c in site.data["contributors"] %}
{% assign contributor = c[1] %}{% if contributor.role contains "author" %}{{contributor.name.given}} {{contributor.name.family}}{% endif %}{% endfor %}
which, prettified, looks like this:
Authors:
{% for c in site.data["contributors"] %}
{% assign contributor = c[1] %}
{% if contributor.role contains "author" %}
{{contributor.name.given}} {{contributor.name.family}}
{% endif %}
{% endfor %}
where its data looks like this:
ianbarber:
name:
given: Ian
family: Barber
org:
name: Google
unit: Developer Relations
country: UK
role:
- engineer
homepage: http://riskcompletefailure.com
google: +ianbarber
twitter: ianbarber
email: [email protected]
description: "Ian is a DRE"
samdutton:
name:
given: Sam
family: Dutton
org:
name: Google
unit: Developer Relations
country: UK
role:
- author
google: +SamDutton
email: [email protected]
description: "Sam is a Developer Advocate"
(example taken from here).
The problem with this approach is that a newline is output if the current element doesn't match the condition, as you can see in https://developers.google.com/web/humans.txt.
How can I fix this?
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All of the standard Liquid filters are supported (see below). To make common tasks easier, Jekyll even adds a few handy filters of its own, all of which you can find on this page. You can also create your own filters using plugins. Prepend baseurl config value to the input to convert a URL path into a relative URL.
When using Liquid in the context of Jekyll, you have access to Jekyll's custom filters in addition to the standard filters that come with Liquid. If your needs are too specific, you can add new filters through library plugins or you can write your own in Ruby. This, however, is out of the scope of this article.
Jekyll uses the Liquid templating language to process templates. Generally in Liquid you output content using two curly braces e.g. { { variable }} and perform logic statements by surrounding them in a curly brace percentage sign e.g. {% if statement %}.
Generally in Liquid you output content using two curly braces e.g. { { variable }} and perform logic statements by surrounding them in a curly brace percentage sign e.g. {% if statement %}. To learn more about Liquid, check out the official Liquid Documentation. Jekyll provides a number of useful Liquid additions to help you build your site:
Jekyll 2.0 has a where filter. See docs. Example - from doc:
{{ site.members | where:"graduation_year","2014" }}
{{ site.members | where_exp:"item", "item.graduation_year == 2014" }}
If you want to get rid of the newline if the condition doesn't match, try to remove the unwanted newlines in the if and for clauses:
{% for c in site.data["contributors"] %}{% assign contributor = c[1] %}{% if contributor.role contains "author" %}
{{contributor.name.given}} {{contributor.name.family}}{% endif %}{% endfor %}
That may not look nice in the source, but it will probably get rid of the newline in the output.
Note: I didn't try this, but similar rearranging helped me get rid of unwanted newlines. You may even have to put the {% if ... on the extreme left, so the indentation does not get included.
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