docs: def build_maya_environment(config, env=None, arg_paths=None):
      """
      Construct maya environment.
      """
      maya_env = MayaEnvironment()
      maya_env.exclude_pattern = config.get_list(Config.PATTERNS, 'exclude')
      maya_env.icon_extensions = config.get_list(Config.PATTERNS, 'icon_ext')
  
      env = get_environment_paths(config, env)
      if not env and arg_paths is None:
          return logger.info('Using maya factory environment setup.')
  
      logger.debug('Launching with addon paths: {}'.format(arg_paths))
      logger.debug('Launching with environment paths: {}'.format(env))
  
      if arg_paths:
          arg_paths = arg_paths.split(' ')
      for directory in flatten_combine_lists(env, arg_paths or ''):
          maya_env.traverse_path_for_valid_application_paths(directory)
      return maya_env