name: Generate Docs

on:
  push:
    branches: [main, master]
  workflow_dispatch: {}

permissions:
  contents: read
  pages: write
  id-token: write

concurrency:
  group: pages
  cancel-in-progress: true

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Install Nix
        uses: cachix/install-nix-action@v27
        with:
          extra_nix_config: |
            experimental-features = nix-command flakes

      - name: Generate Doxygen
        run: |
          nix develop ./nix --command \
            doxygen willow/docs/doxygen/Doxyfile

      - name: Upload Pages artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: out/doxygen/willow/html

  deploy:
    environment:
      name: github-pages
      url: ${{ steps.deployment.outputs.page_url }}
    runs-on: ubuntu-latest
    needs: build
    steps:
      - name: Deploy to GitHub Pages
        id: deployment
        uses: actions/deploy-pages@v4