ci.yml

name: ci

# What this checks beyond `mcpp build`: that the two big generated tables still
# match what upstream's own Python produces. build.mcpp is a transliteration of
# those scripts, and a transliteration is only worth having if it is checked
# against the original.
on:
  push:
    branches: [ '**' ]
  pull_request:
  workflow_dispatch:

concurrency:
  group: ci-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      # Two PATH entries: `xlings` lands in ~/.xlings/bin, but `mcpp` is
      # installed INTO THE SUBOS. Without the second the next step dies with a
      # bare `mcpp: command not found`.
      - name: Install xlings + mcpp
        env:
          XLINGS_NON_INTERACTIVE: "1"
          XLINGS_VERSION: "2026.8.27.5"
        run: |
          curl -fsSL https://d2learn.org/xlings-install.sh | bash
          echo "$HOME/.xlings/bin" >> "$GITHUB_PATH"
          "$HOME/.xlings/bin/xlings" --version
          "$HOME/.xlings/bin/xlings" install mcpp
          echo "$HOME/.xlings/subos/default/bin" >> "$GITHUB_PATH"

      - name: build and test
        run: |
          cd mcpp/fontconfig
          mcpp test

      - name: the generated tables match upstream's own generators
        run: |
          # LC_ALL=C is load-bearing. fc-lang.py's output order follows the
          # order its arguments arrive in, and `ls *.orth` in a UTF-8 locale
          # sorts `ayc.orth` before `ay.orth` — collation ignores the dot.
          # Measured: without this the diff shows two lines out of 4897, and
          # the C++ side (std::sort over std::string, i.e. byte order) is the
          # one that is right.
          export LC_ALL=C

          out=$(find mcpp/fontconfig/target -name fclang.h | head -1)
          test -n "$out" || { echo "::error::build.mcpp produced no fclang.h"; exit 1; }
          ( cd upstream/fc-lang && python3 fc-lang.py $(ls *.orth) \
              --template fclang.tmpl.h --output /tmp/ref-fclang.h )
          diff "$out" /tmp/ref-fclang.h || {
            echo "::error::fclang.h differs from upstream's fc-lang.py"; exit 1; }
          echo "fclang.h matches ($(wc -l < "$out") lines)"

          out=$(find mcpp/fontconfig/target -name fccase.h | head -1)
          test -n "$out" || { echo "::error::build.mcpp produced no fccase.h"; exit 1; }
          ( cd upstream/fc-case && python3 fc-case.py CaseFolding.txt \
              --template fccase.tmpl.h --output /tmp/ref-fccase.h )
          diff "$out" /tmp/ref-fccase.h || {
            echo "::error::fccase.h differs from upstream's fc-case.py"; exit 1; }
          echo "fccase.h matches ($(wc -l < "$out") lines)"

      - name: no host font paths were compiled in
        run: |
          # The four runtime paths are empty on purpose; a wrong value here
          # fails by SILENTLY WORKING on a machine that has fonts where
          # upstream's default points.
          so=$(find mcpp/fontconfig/target -name '*.o' | head -200)
          if strings $so 2>/dev/null | grep -qE '/usr/share/fonts|/etc/fonts'; then
            echo "::error::a host font path was compiled in"
            strings $so | grep -E '/usr/share/fonts|/etc/fonts' | head
            exit 1
          fi
          echo "no /usr/share/fonts or /etc/fonts in the objects"

      - name: upstream/ is the release tarball, unmodified
        run: |
          curl -fsSL -o /tmp/u.tar.gz \
            https://gitlab.freedesktop.org/fontconfig/fontconfig/-/archive/2.15.0/fontconfig-2.15.0.tar.gz
          mkdir -p /tmp/u && tar xzf /tmp/u.tar.gz -C /tmp/u --strip-components=1
          if ! diff -r -q /tmp/u upstream >/dev/null 2>&1; then
            echo "::error::upstream/ differs from fontconfig 2.15.0"
            diff -r -q /tmp/u upstream | head -20
            exit 1
          fi
          echo "upstream/ is 2.15.0, unmodified"