Use the default Jieba dict for Chinese search if not set

[Snoopy1866]

Subject: if user do not set the dict option, fallback to the default dict provided by jieba

Feature or Bugfix

• Feature

Purpose

• Provide a fallback if user do not set the dict option when html_search_language value is zh

Detail

• jieba has provided a default dict, whose path can be easily obtained by call jieba.get_dict_file().name

Relates

• https://github.com/fxsjy/jieba/blob/67fa2e36e72f69d9134b8a1037b83fbb070b9775/jieba/__init__.py#L374-L378

[picnixz]

AFAICT, this would leave a file descriptor opened (jieba.get_dict_file() opens a file in read mode). So ideally, we should find a way to retrieve the default dict path without having to open the file. Would it be possible?

[Snoopy1866]

@picnixz yes, because the default dict is installed with jieba, so we can directly get its path using os.path.join(os.path.dirname(jieba.__file__), "dict.txt")