name: Deploy site to GitHub Pages

# Custom Pages build: compiles Thor from source via the Nix flake, uses it to
# generate thor/site/, and publishes the result. Replaces the default Jekyll build.

on:
  push:
    branches: [main]
    # Only rebuild when something that affects the output changes.
    paths:
      - "site/**"
      - "**/*.odin"
      - "defaults/**"
      - "flake.nix"
      - "flake.lock"
      - ".github/workflows/pages.yml"
  workflow_dispatch:

# Least-privilege permissions required to deploy to GitHub Pages.
permissions:
  contents: read
  pages: write
  id-token: write

# Allow one concurrent deployment; don't cancel an in-progress publish.
concurrency:
  group: pages
  cancel-in-progress: false

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

      - name: Install Nix
        uses: DeterminateSystems/nix-installer-action@main

      # Optional but recommended: caches the Nix store across runs so Thor
      # (and its tree-sitter grammars) aren't rebuilt from scratch every time.
      - name: Cache Nix store
        uses: DeterminateSystems/magic-nix-cache-action@main

      - name: Build Thor
        run: nix build .#default --print-build-logs

      - name: Generate site
        working-directory: site
        run: ../result/bin/thor --base-url "https://sbrow.github.io/thor" --minify

      - name: Upload Pages artifact
        uses: actions/upload-pages-artifact@v3
        with:
          path: site/public

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