class Diffy::SplitDiff

def initialize(left, right, options = {})
  @format = options[:format] || Diffy::Diff.default_format
  formats = Format.instance_methods(false).map { |x| x.to_s }
  unless formats.include?(@format.to_s)
    fail ArgumentError, "Format #{format.inspect} is not a valid format"
  end
  @diff = Diffy::Diff.new(left, right, options).to_s(@format)
  @left_diff, @right_diff = split
end