docs/_plugins/liquify.rb

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#
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# *A Jekyll filter that can parse Liquid in Liquid variables
#
# Usage:
# e.g. Welcome to {{ page.title | liquify }}!

module Jekyll
  module LiquifyFilter
    def liquify(input)
      Liquid::Template.parse(input).render(@context)
    end
  end
end

Liquid::Template.register_filter(Jekyll::LiquifyFilter)