name: Check nix packages
on:
    pull_request:
      paths:
        - "./*.nix"
        - ".github/workflows/nix.yml"
        - "assets/**"
        - "customize/**"
    push:
        branches: [master]
        paths:
          - "./*.nix"
          - ".github/workflows/nix.yml"
          - "assets/**"
          - "customize/**"
jobs:
    flake:
        name: Check flake
        runs-on: ubuntu-latest
        steps:
            - uses: actions/checkout@v4
            - name: Check Nix flake inputs
              uses: DeterminateSystems/flake-checker-action@v5
              with:
                send-statistics: false
                fail-mode: true
            - name: Install Nix
              uses: DeterminateSystems/nix-installer-action@v9
            - name: Check repository
              run: nix flake check
    matrix:
        name: Generate build matrix
        runs-on: ubuntu-latest
        outputs:
            themes: ${{ steps.generate-matrix.outputs.themes }}
        steps:
            - uses: actions/checkout@v4
            - name: Generate matrix
              id: generate-matrix
              run: |
                THEMES=$(ls assets/backgrounds/ | sed 's/\.png$//g' | jq --raw-input | jq --slurp -c)
                echo "themes=$THEMES" >> $GITHUB_OUTPUT
    build:
        name: Check nix build for theme ${{ matrix.theme }}
        runs-on: ubuntu-latest
        needs:
            - matrix
        strategy:
            matrix: 
                theme: ${{ fromJSON(needs.matrix.outputs.themes) }}
        steps:
            - uses: actions/checkout@v4
            - name: Install Nix
              uses: DeterminateSystems/nix-installer-action@v9
            - name: Build package
              run: nix build .#${{ matrix.theme }}-grub-theme