A hacky Liquid script to allow page-specific stylesheets using Yaml Front Matter

custom_stylesheets.html

---
---
{% assign delim = "|" %}
{% assign had_elements = "" %}
<!-- Custom Stylesheets - use custom_css in YAML front matter !-->
{% if page.custom_css %}
	{% for stylesheet in page.custom_css %}
		{% capture had_elements %}{{ had_elements | join: delim }}{{ delim }}{{ stylesheet }}{% endcapture %}
		{% assign had_elements = had_elements | split: delim %}
		<link rel="stylesheet" href="/assets/css/{{ stylesheet }}.css" type="text/css">
	{% endfor %}
{% endif %}
{% if layout.custom_css %}
	{% for stylesheet in layout.custom_css %}
		{% if had_elements contains stylesheet %}{% else %}
			<link rel="stylesheet" href="/assets/css/{{ stylesheet }}.css" type="text/css">
		{% endif %}
	{% endfor %}
{% endif %}