name: Build
on:
  pull_request:
  push:
jobs:
  build:
    strategy:
      matrix:
        include:
          - label: x86_64-linux
            image: ubuntu-latest
          - label: aarch64-linux
            image: ubuntu-latest
            system: aarch64-linux
          - label: x86_64-darwin
            image: macos-12

    name: ${{ matrix.label }}
    runs-on: ${{ matrix.image }}
    steps:
      - uses: actions/checkout@v3.3.0

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@e1f2e54ff90b012560f19481e250bb7d909f3acd

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v2.1.0
        if: matrix.system != ''

      - name: Generate System Flags
        run: |
          LOCAL_SYSTEM=$(nix-instantiate --eval --json -E 'builtins.currentSystem' | jq -r)
          HOST_SYSTEM=${HOST_SYSTEM:-$LOCAL_SYSTEM}
          if [[ "$LOCAL_SYSTEM" != "$HOST_SYSTEM" ]]; then
            echo "system_flags=--system $HOST_SYSTEM" >>"$GITHUB_ENV"
            echo "extra-platforms = $HOST_SYSTEM" | sudo tee -a /etc/nix/nix.conf
          fi
        env:
          HOST_SYSTEM: '${{ matrix.system }}'

      - name: Enable Binary Cache
        uses: cachix/cachix-action@v12
        with:
          name: colmena
          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

      - name: Build Colmena
        run: nix build -L $system_flags

      - name: Build manual
        run: nix build .#manual -L