class ChefCLI::Policyfile::Differ

def diff_lines(old_lines, new_lines)
  file_length_difference = INITIAL_FILE_LENGTH_DIFFERENCE
  previous_hunk = nil
  diffs = Diff::LCS.diff(old_lines, new_lines)
  ui.print("\n")
  diffs.each do |piece|
    hunk = Diff::LCS::Hunk.new(old_lines, new_lines, piece, LINES_OF_CONTEXT, file_length_difference)
    file_length_difference = hunk.file_length_difference
    maybe_contiguous_hunks = (previous_hunk.nil? || hunk.merge(previous_hunk))
    unless maybe_contiguous_hunks
      print_color_diff("#{previous_hunk.diff(FORMAT)}\n")
    end
    previous_hunk = hunk
  end
  print_color_diff("#{previous_hunk.diff(FORMAT)}\n") unless previous_hunk.nil?
  ui.print("\n")
end