middleman/middleman-syntax

# If Haml is around, define a :code filter that can be used to more conveniently output highlighted code.

if defined? Haml
  module HamlMonkeyPatch
    def render(code)
      code = code.rstrip
      code = code.encode(Encoding::UTF_8)

      # Allow language to be specified via a special comment like:
      # # lang: ruby
      if code.lines.first =~ /\A\s*#\s*lang:\s*(\w+)$/
        language = $1
        code = code.lines.to_a[1..-1].join # Strip first line
      end

      Middleman::Syntax::Highlighter.highlight(code, language)
    end
  end

  if Gem::Version.new(Haml::VERSION) >= Gem::Version.new("6.0.0")
    module Haml
      class Filters
        class Code < Base
          include HamlMonkeyPatch

          def compile(node)
            [:static, render(node.value[:text])]
          end
        end

        register :code, Code
      end
    end
  else
    module Haml
      module Filters
        module Code
          include Base
          extend HamlMonkeyPatch
        end
      end
    end
  end
end