subset.sh - mozsearch

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#!/bin/bash

# Produces a subset of Noto Sans CJK KR containing only the code points used by

# the `css/css-ui/text-overflow-string-*` tests, so that the ellipsis has

# predictable advance widths.

# Get the input font from the noto-cjk release:

# https://github.com/notofonts/noto-cjk/releases/tag/Sans2.004

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

# run without installing [fonttools] globally.

# Usage: ./subset.sh /path/to/NotoSansCJKkr-Regular.otf

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

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

# Only the Hangul syllables used by the tests: 안 녕 낮. Other scripts in the

# ellipsis strings (CJK ideographs, kana, full-width Latin) are full-width, so

# the tests size them with the `ic` unit instead of this font.

range="--unicodes=C548,B155,B0AE"

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

  (set -x;

    $subsetter "$path" $range --layout-features='*' \

      --output-file="NotoSansCJKkr-Regular-subset$ext"

done