web/_includes/img-url.html

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{%- comment -%}
Generate image final URL based on `site.img_cdn`, `page.img_path`
Arguments:
src - required, basic image path
img_path - optional, relative path of image
absolute - optional, boolean, if true, generate absolute URL
Return:
image URL
{%- endcomment -%}
{% assign url = include.src %}
{%- if url -%}
{% unless url contains ':' %}
{%- comment -%} CND URL {%- endcomment -%}
{% assign prefix = site.img_cdn | default: '' %}
{%- comment -%} Add page image path prefix {%- endcomment -%}
{% assign url = include.img_path | default: '' | append: '/' | append: url %}
{% assign url = prefix
| append: '/'
| append: url
| replace: '///', '/'
| replace: '//', '/'
| replace: ':', ':/'
%}
{% if include.absolute %}
{% assign url = url | absolute_url %}
{% else %}
{% assign url = url | relative_url %}
{% endif %}
{% endunless %}
{%- endif -%}
{{- url -}}