class Diff::LCS::Hunk

def context_range(mode)

range has only one item in it. Otherwise, it's 'start,end'
Generate a range of item numbers to print. Only print 1 number if the 
def context_range(mode)
  case mode
  when :old
    s, e = (@start_old + 1), (@end_old + 1)
  when :new
    s, e = (@start_new + 1), (@end_new + 1)
  end
  (s < e) ? "#{s},#{e}" : "#{e}"
end