module MiniSyntax
  module Highlighter
    module Haml
      def self.highlight(code)
        code.gsub! /^( *)(%[a-z\-]+)?(([\.\#][a-z\-_]+)*)((<)?(>)?&?)(=.+?$)?/i do
          result = $1 || ''
          tag = $2
          classes_and_id = $3
          options = $5
          ruby = $8
          result << %Q(<em>#{tag}</em>) if tag
          result << classes_and_id if classes_and_id
          result << options if options
          result << MiniSyntax.highlight(ruby, :ruby) if ruby
          result
        end
        code.gsub! /^(  )*(-.+?)$/ do
          %Q(#{$1}#{MiniSyntax.highlight($2, :ruby)})
        end
        code
      end
    end
  end
end

MiniSyntax.register(:haml, MiniSyntax::Highlighter::Haml)