docs: def get_version_from_scm(path=None):
      """Get the current version string of this package using SCM tool.
  
      Parameters
      ----------
      path : None or string, optional
          The SCM checkout path (default is current directory)
  
      Returns
      -------
      version : string
          The version string for this package
  
      """
      if is_git(path):
          return 'git', get_git_version(path)
      elif is_svn(path):
          return 'svn', get_svn_version(path)
      return None, None