28 lines
613 B
Ruby
28 lines
613 B
Ruby
# frozen_string_literal: true
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module Banzai
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module Filter
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class YamlFrontMatterFilter < HTML::Pipeline::Filter
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DELIM = '---'.freeze
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# Hat-tip to Middleman: https://git.io/v2e0z
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PATTERN = %r{
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\A(?:[^\r\n]*coding:[^\r\n]*\r?\n)?
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(?<start>#{DELIM})[ ]*\r?\n
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(?<frontmatter>.*?)[ ]*\r?\n?
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^(?<stop>#{DELIM})[ ]*\r?\n?
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\r?\n?
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(?<content>.*)
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}mx.freeze
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def call
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match = PATTERN.match(html)
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return html unless match
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"```yaml\n#{match['frontmatter']}\n```\n\n#{match['content']}"
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end
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end
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end
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end
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