code: def dfl_local_dir():
      
      project_name = git_repo()
      if not project_name and sys.argv:
          project_name = sys.argv[0]
      if not project_name:
          project_name = "unknown"
      dirpath = os.path.join(DFL_DIR_PARENT, project_name)
      return os.path.expanduser(dirpath)
docs: Infers a default local directory, which is DFL_DIR_PARENT/<project name>,
      where the project name is guessed according to the following rules.
  
      If we detect we're in a repository, the project name is the repository name
      (git only for now).
  
      If we're not in a repository, and the script file sys.argv[0] is non-null,
      then that is used.
  
      Otherwise, we just say it's "unknown"