class Xcodeproj::Project::Object::FileReferencesFactory

def new_file_reference(group, path, source_tree)
  path = Pathname.new(path)
  ref = group.project.new(PBXFileReference)
  group.children << ref
  GroupableHelper.set_path_with_source_tree(ref, path, source_tree)
  ref.set_last_known_file_type
  ref
end