name: CI

on:
  pull_request:
  push:

jobs:
  build:
    runs-on: ubuntu-latest

    steps:
    - uses: actions/checkout@v2.3.4

    - name: Install Nix
      uses: cachix/install-nix-action@v13
      with:
        skip_adding_nixpkgs_channel: true
        install_url: https://nixos-nix-install-tests.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
        install_options: '--tarball-url-prefix https://nixos-nix-install-tests.cachix.org/serve'
        extra_nix_config: |
          experimental-features = nix-command flakes

    - name: Build with cachix
      uses: cachix/cachix-action@v10
      with:
        name: hakyll-nix-template
        signingKey: ${{ secrets.CACHIX_SIGNING_KEY }}
        #authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}

    - run: nix build

    - name: Artifact pages
      uses: actions/upload-artifact@v2
      with:
        name: pages
        path: result/dist

  deploy:
    if: github.ref == 'refs/heads/main'
    runs-on: ubuntu-latest
    needs: [build]

    steps:
      - name: Download artifact
        uses: actions/download-artifact@v2
        with:
          name: pages
          path: result

      - name: GitHub Pages
        if: success()
        uses: crazy-max/ghaction-github-pages@v2.5.0
        with:
          build_dir: result
          target_branch: gh-pages
          keep_history: false
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}