ctex-fontset-custom.def

\ProvidesExplFile{ctex-fontset-custom.def}
{\ExplFileDate}{1.0.0}{\ExplFileDescription}
\setCJKmainfont { NotoSerifSC-Regular.otf }
[
    Path       = fonts/,
    BoldFont   = NotoSerifSC-Bold.otf,
    ItalicFont = FZKTK.TTF
]
\setCJKfamilyfont { zhsong } { NotoSerifSC-Regular }
[
    Path       = fonts/,
    Extension  = .otf,
    BoldFont   = NotoSerifSC-Bold
]
\setCJKfamilyfont { zhkai  } { FZKTK.ttf }
[ Path = fonts/ ]
\NewDocumentCommand \songti   { } { \CJKfamily { zhsong  } }
\NewDocumentCommand \kaishu   { } { \CJKfamily { zhkai   } }