class Xcodeproj::Helper::TargetDiff

def new_source_build_files
  new = @target2.source_build_phase.files.reject do |target2_build_file|
    @target1.source_build_phase.files.any? do |target1_build_file|
      target1_build_file.file_ref.path == target2_build_file.file_ref.path
    end
  end
  new.sort_by { |build_file| build_file.file_ref.path }
end