class UnitDiff

def parse_input(input, output)
  current = []
  data = []
  data << current
  print_lines = true
  term = "\nFinished".split(//).map { |c| c[0] }
  term_length = term.size
  old_sync = output.sync
  output.sync = true
  while line = input.gets
    case line
    when /^(Loaded suite|Started)/ then
      print_lines = true
      output.puts line
      chars = []
      while c = input.getc do
        output.putc c
        chars << c
        tail = chars[-term_length..-1]
        break if chars.size >= term_length and tail == term
      end
      output.puts input.gets # the rest of "Finished in..."
      output.puts
      next
    when /^\s*$/, /^\(?\s*\d+\) (Failure|Error):/, /^\d+\)/ then
      print_lines = false
      current = []
      data << current
    when /^Finished in \d/ then
      print_lines = false
    end
    output.puts line if print_lines
    current << line
  end
  output.sync = old_sync
  data = data.reject { |o| o == ["\n"] or o.empty? }
  footer = data.pop
  data.map do |result|
    break if result.find do |result_line|
      result_line =~ / expected( but was|, not)/
    end
    header = result.find do |result_line|
      result_line =~ /^\(?\s*\d+\) (Failure|Error):/
    end
    break unless header
    message_index = result.index(header) + 2
    result[message_index..-1] = result[message_index..-1].join
  end
  return data, footer
end