usage: gftools-gen-avar2 [-h] (--out OUT | --inplace) fonts [fonts ...] src

positional arguments:
  fonts          Variable TTF files which make up a family
  src            use yaml/json file to build STAT

options:
  -h, --help     show this help message and exit
  --out, -o OUT  Output dir for fonts
  --inplace      Overwrite input files