how to set a new file type to search?

[yylays]

you can define a new type in Ackrc like "--type-set=inf:ext:inf", so i can search all the .inf file, however in rg option there is only "--type-add" ,i wander if you can define a file type to search. Thanks.

[BurntSushi]

Yes. It's documented in the guide: https://github.com/BurntSushi/ripgrep/blob/master/GUIDE.md#manual-filtering-file-types

In particular, you probably want to use --type-add in your configuration file: https://github.com/BurntSushi/ripgrep/blob/master/GUIDE.md#configuration-file

[yylays]

Thanks, i should read the document carefully. It helps.