# trim a ttf down to the printable ascii subset (U+0020..007E) so we only embed
# since revel doesnt actually render all glyphs, some fonts that lung wanted are
# nerd fonts because hes a NERD and are HUGE like my PENIS.
#
# usage: revo subset-ttf.rv <in.ttf> <out.ttf>

if argv:len() < 3 do
  panic("usage: subset-ttf.rv <in.ttf> <out.ttf>")
end

const in_path = argv[1]
const out_path = argv[2]

match system({
  "python3", "-m", "fontTools.subset", in_path,
  "--unicodes=U+0020-007E",
  "--no-hinting", "--glyph-names",
  "--output-file=" ~ out_path,
})
  | {:ok, _} => print("wrote " ~ out_path)
  | {:err, error} => panic("subset failed (#{error}), need fonttools: python3 -m pip install fonttools")