class Thor::Options

def formatted_usage
  return "" if @switches.empty?
  @switches.map do |opt, type|
    case type
    when :boolean
      "[#{opt}]"
    when :required
      opt + "=" + opt.gsub(/\-/, "").upcase
    else
      sample = @defaults[undasherize(opt)]
      sample ||= case type
        when :optional then undasherize(opt).gsub(/\-/, "_").upcase
        when :numeric  then "N"
        end
      "[" + opt + "=" + sample.to_s + "]"
    end
  end.join(" ")
end