docs: def from_git(self, path=None, prefer_daily=False):
          """Use Git to determine the package version.
  
             This routine uses the __file__ value of the caller to determine
             which Git repository root to use.
          """
          if self._version is None:
              frame = caller(1)
              path = frame.f_globals.get('__file__') or '.'
              providers = ([git_day, git_version] if prefer_daily
                           else [git_version, git_day])
              for provider in providers:
                  if self._version is not None:
                      break
                  try:
                      with cd(path):
                          self._version = provider()
                  except CalledProcessError:
                      pass
                  except OSError as e:
                      if e.errno != errno.ENOENT:
                          raise
          return self