module Kramdown::Converter::SyntaxHighlighter::Rouge

def self.formatter_class(opts = {})
  case formatter = opts[:formatter]
  when Class
    formatter
  when /\A[[:upper:]][[:alnum:]_]*\z/
    ::Rouge::Formatters.const_get(formatter)
  else
    # Available in Rouge 2.0 or later
    ::Rouge::Formatters::HTMLLegacy
  end
rescue NameError
  # Fallback to Rouge 1.x
  ::Rouge::Formatters::HTML
end