subset.sh - mozsearch

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#!/bin/bash

# Produces subset font files for testing the `text-spacing-trim` property.

# Requires `pyftsubset` from [fonttools]. If [uv] is installed, this script can

# run without installing [fonttools] globally.

# [fonttools]: https://github.com/fonttools/fonttools

# [uv]: https://docs.astral.sh/uv/

range="--unicodes=20-7E,2018-201F,56FD,6C34,3000-301F,30FB,FF01-FF1F,FF5B-FF65"

subrange="--unicodes=20-7E,56FD,FF08-FF09"

features="--layout-features+=halt,fwid,hwid,palt,pwid,vhal,vpal"

features_chws="$features,chws,vchw"

ext=".otf"

if [[ -z "$subsetter" ]]; then

  if command -v uvx &>/dev/null; then

    subsetter="uvx --from fonttools pyftsubset"

  else

    subsetter="pyftsubset"

fi

fi

subsetter=${subsetter:-pyftsubset}

for path in "$@"; do

  filename="$(basename -- "$path")"

  stem="${filename%.*}"

  output_halt="$stem-subset-halt"

  output_chws="$stem-subset-chws"

  output_min="$stem-subset-halt-min"

  (set -x;

    $subsetter "$path" $range $features --output-file="$output_halt$ext"

    $subsetter "$path" $range $features_chws --output-file="$output_chws$ext"

    $subsetter "$output_halt$ext" $subrange $features --output-file="$output_min$ext"

    $subsetter "$output_halt$ext" --unicodes=3002 $features --output-file="$output_halt-3002$ext"

    $subsetter "$output_halt$ext" --unicodes=300C $features --output-file="$output_halt-300C$ext"

    $subsetter "$output_halt$ext" --unicodes=FF1A $features --output-file="$output_halt-FF1A$ext"

done