name: CI

on:
  push:
    branches: [main]
  pull_request:
  workflow_dispatch:

jobs:
  build:
    name: Build (${{ matrix.system }})

    strategy:
      fail-fast: false
      matrix:
        include:
          - system: x86_64-linux
            os: ubuntu-latest

    runs-on: ${{ matrix.os }}

    steps:
        # https://github.com/actions/runner-images/issues/2840#issuecomment-790492173
      - name: Clear disk space
        run: |
          sudo rm -rf /usr/share/dotnet
          sudo rm -rf /opt/ghc
          sudo rm -rf /usr/local/share/boost
          sudo rm -rf "$AGENT_TOOLSDIRECTORY"

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

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v16
        with:
          diagnostic-endpoint: ""

      - name: Setup Cache
        uses: DeterminateSystems/magic-nix-cache-action@v8

      - name: Run build
        run: |
          nix run \
            --inputs-from . \
            nixpkgs#nix-fast-build -- \
            --no-nom \
            --option allow-import-from-derivation false

  format:
    name: Format

    runs-on: ubuntu-latest

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

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@v16
        with:
          diagnostic-endpoint: ""

      - name: Check formatting
        run: nix fmt -- --check .

  build-gate:
    name: Build gate
    needs: [build, format]

    if: always()

    runs-on: ubuntu-latest

    steps:
      - name: Exit with error
        if: contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled')
        run: exit 1