gistfile1.rbx

def define(label, &block)
  if block_given?
    definition = capture(&block)
  else
    definition = label.first.last
    label = label.first.first
  end

  content = markaby do
    dt label.t
    dd { definition }
  end.to_s unless definition.blank?
  concat(content.to_s, block.binding) if block_given?
  content
end