blog/_includes/functions/get_value.html

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{%- if include.params.name -%}
{%- assign name = include.params.name -%}
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{%- endif -%}
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{%- if page[name] != nil -%}
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{%- assign return = page[name] -%}
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{%- elsif site[name] != nil -%}
{%- assign return = site[name] -%}
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{%- elsif site.data[name] != nil -%}
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{%- assign return = site.data[name] -%}
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{%- elsif site.defaults[page.layout][name] != nil -%}
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{%- assign return = site.defaults[page.layout][name] -%}
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{%- elsif site.data.defaults[page.layout][name] != nil -%}
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{%- assign return = site.data.defaults[page.layout][name] -%}
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{%- elsif layout[name] != nil -%}
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{%- assign return = layout[name] -%}
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{%- else -%}
{%- assign return = include.params.default -%}
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{%- endif -%}