code: func (m *Meta) initStatePaths() {
  	if m.statePath == "" {
  		m.statePath = DefaultStateFilename
  	}
  	if m.stateOutPath == "" {
  		m.stateOutPath = m.statePath
  	}
  	if m.backupPath == "" {
  		m.backupPath = m.stateOutPath + DefaultBackupExtension
  	}
  }
docs: // initStatePaths is used to initialize the default values for
  // statePath, stateOutPath, and backupPath