Automatically sets the terminal encoding of vim.

Vim uses the termencoding option to control the encoding during output. This option is empty by default, that is, no conversion is performed,
This led me to open the UTF-8 file under the GB code Terminal, although can identify, the display is garbled.
You can set the terminal encoding, but it is troublesome to set locale accordingly.

Generally, the terminal encoding is the same as the locale setting, so you can use this setting:

Let & termencoding = substitute ($ lc_all, "[A-Za-Z _-] */.", "", "")

Set termencoding to the part after the Value Point of locale, for example, lc_all is zh_cn.gbk,
Termencoding will be set to GBK