name: "Test"
on:
  pull_request:
  push:
jobs:
  calculate-matrix:
    name: Calculate build matrix
    runs-on: ubuntu-latest
    outputs:
      matrix: ${{ steps.set-matrix.outputs.matrix }}
    steps:
      - uses: actions/checkout@v2.4.0

      - uses: cachix/install-nix-action@v16
        with:
          nix_path: nixpkgs=channel:nixos-unstable
          extra_nix_config: |
            experimental-features = nix-command flakes

      - name: Calculate build matrix
        id: set-matrix
        run: |
          # Use `-c` flag with jq for compact output (doesn't keep newlines in
          # output which was causing issues when setting the output
          matrix=$(nix flake show --json | jq -c '.nixosConfigurations | keys')
          echo "::set-output name=matrix::$matrix"

  tests:
    name: Build NixOS configurations
    runs-on: ubuntu-latest
    needs:
      - calculate-matrix
    strategy:
      fail-fast: false
      matrix:
        target: "${{ fromJson(needs.calculate-matrix.outputs.matrix) }}"


    steps:
      - uses: actions/checkout@v2.4.0

      - uses: cachix/install-nix-action@v16
        with:
          nix_path: nixpkgs=channel:nixos-unstable
          extra_nix_config: |
            experimental-features = nix-command flakes

      - uses: cachix/cachix-action@v10
        with:
          name: alejandro-dotfiles
          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'

      - run: nix-env -i nixos-rebuild -f '<nixpkgs>'

      - run: nixos-rebuild build --flake ".#${{ matrix.target }}"

      - run: echo OK