name: Generate Nix Options Docs

on:
  push:
    paths:
      - 'nix/**-modules.nix'
      - 'nix/generate-options.nix'
      - 'flake.nix'
      - '.github/scripts/generate-nix-options-docs.py'
  pull_request:
    paths:
      - 'nix/**-modules.nix'

jobs:
  update-docs:
    runs-on: ubuntu-latest
    permissions:
      contents: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          ref: ${{ github.head_ref }}

      - name: Install Nix
        uses: cachix/install-nix-action@v30
        with:
          extra_nix_config: |
            experimental-features = nix-command flakes

      - name: Build Options JSON
        run: |
          nix build .#nixos-options-json --out-link result-nixos
          nix build .#hm-options-json --out-link result-hm

      - name: Render to CommonMark
        run: |
          echo '{}' > /tmp/manpage-urls.json
          nix run nixpkgs#nixos-render-docs -- options commonmark \
            --manpage-urls /tmp/manpage-urls.json \
            --revision nightly \
            result-nixos/share/doc/nixos/options.json \
            /tmp/nixos-raw.md
          nix run nixpkgs#nixos-render-docs -- options commonmark \
            --manpage-urls /tmp/manpage-urls.json \
            --revision nightly \
            result-hm/share/doc/nixos/options.json \
            /tmp/hm-raw.md

      - name: Format to Markdown
        run: |
          python3 ./.github/scripts/generate-nix-options-docs.py \
            /tmp/nixos-raw.md \
            /tmp/hm-raw.md \
            docs/nix-options.md

      - name: Auto-commit changes
        uses: stefanzweifel/git-auto-commit-action@v5
        with:
          commit_message: "docs: auto-generate Nix module options"
          file_pattern: 'docs/*-options.md'
          branch: ${{ github.head_ref }}