name: Evaluate configurations

on:
  push:

jobs:
  get-names:
    name: Get machine names
    runs-on: ubuntu-latest

    outputs:
      machines: ${{ steps.machines.outputs.machines }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v30

      - name: Get machine names
        id: machines
        run: |
          names=$(nix eval --json .#nixosConfigurations --apply 'builtins.attrNames')
          echo "machines=$names" >> "$GITHUB_OUTPUT"

  eval:
    name: Evaluate configuration
    runs-on: ubuntu-latest
    needs: get-names

    strategy:
      matrix:
        machine: ${{ fromJSON(needs.get-names.outputs.machines) }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v30

      - name: Eval config
        run: |
          nix eval --raw .#nixosConfigurations.${{ matrix.machine }}.config.system.build.toplevel