class HighLine::Menu

def mark_for_decoration(text, ix)
  case @index
  when :number
    ["#{ix + 1}#{@index_suffix}", text]
  when :letter, :capital_letter
    first_letter = (@index == :capital_letter ? 'A' : 'a')
    ["#{(first_letter.ord + ix).chr}#{@index_suffix}", text]
  when :none
    [text, ""]
  else
    ["#{index}#{@index_suffix}", text]
  end
end