/usr/bin/gftools-gen-spac

usage: gftools-gen-spac [-h] [--user-min USER_MIN] [--user-max USER_MAX] [--out OUT | --inplace]
                        font min max

Add a SPAC axis to a variable font.

positional arguments:
  font                 Path to the variable font file to modify.
  min                  Min amount of spacing to add
  max                  Max amount of spacing to add

options:
  -h, --help           show this help message and exit
  --user-min USER_MIN  The user-exposed axis minimum (default: same as min)
  --user-max USER_MAX  The user-exposed axis maximum (default: same as max)
  --out, -o OUT        Output dir for fonts
  --inplace            Overwrite input files