name: "Release PDF"
on:
  push:
    tags:
      - "v*.*.*"

jobs:
  generate-pdf:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Install nix
        uses: cachix/install-nix-action@v23
        with:
          nix_path: "nixpkgs=channel:nixpkgs-unstable"
          extra_nix_config: |
            experimental-features = nix-command flakes
            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
      - name: Show nixpkgs version
        run: nix-instantiate --eval -E '(import <nixpkgs> {}).lib.version'
      - name: Run a command with nix develop
        run: |
          nix develop .#export-pdf --ignore-environment --command bash -c '
            pnpm install
            pnpm export-pdf
          '
      # # For debugging, upload the pdfs as artifacts
      # - uses: actions/upload-artifact@v3
      #   with:
      #     name: pdf
      #     path: '*.pdf'
      - name: Generate changelog
        run: |
          # Get the previous tag
          git fetch --tags
          PREVIOUS_TAG=$(git tag --sort=-creatordate | head -n 2 | tail -n 1)
          # Generate the changelog
          git log --pretty=format:"%h %s" $PREVIOUS_TAG..HEAD > CHANGELOG

          echo "Changelog from $PREVIOUS_TAG to HEAD:"
          cat CHANGELOG
      - name: Release PDF
        uses: softprops/action-gh-release@v1
        if: startsWith(github.ref, 'refs/tags/')
        with:
          generate_release_notes: true
          body_path: CHANGELOG
          files: |
            nixos-and-flakes-book.pdf