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