class Diffy::Diff

def each
  lines = case @options[:include_diff_info]
  when false
    # this "primes" the diff and sets up the paths we'll reference below.
    diff
    # caching this regexp improves the performance of the loop by a
    # considerable amount.
    regexp = /^(--- "?#{@paths[0]}"?|\+\+\+ "?#{@paths[1]}"?|@@|\\\\)/
    diff.split("\n").reject{|x| x =~ regexp }.map {|line| line + "\n" }
  when true
    diff.split("\n").map {|line| line + "\n" }
  end
  if block_given?
    lines.each{|line| yield line}
  else
    lines.to_enum
  end
end