name: Update packages

on:
  schedule:
    - cron: '0 6 * * 1'
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  update:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: cachix/install-nix-action@v31
        with:
          extra_nix_config: |
            experimental-features = nix-command flakes
            access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}

      - name: Update packages
        run: |
          for pkg_dir in pkgs/*/; do
            pkg="$(basename "$pkg_dir")"
            default_nix="${pkg_dir}default.nix"
            [ -f "$default_nix" ] || continue

            if grep -qE 'buildGoModule|buildGo[0-9]+Module' "$default_nix"; then
              echo "==> $pkg (go)"
              nix run nixpkgs#nix-update -- --flake --build "$pkg" || true
            elif grep -qE 'buildPythonApplication|buildPythonPackage' "$default_nix"; then
              echo "==> $pkg (python)"
              nix run nixpkgs#nix-update -- --flake "$pkg" || true
            fi
          done

      - name: Update README package list
        run: python3 scripts/update-readme.py
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Clean build results
        run: rm -rf result result-*

      - uses: peter-evans/create-pull-request@v7
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          commit-message: "auto-update: bump package versions"
          title: "Auto-update packages"
          body: |
            Automated package updates via `nix-update`.

            Check individual diffs to see what changed.
          branch: auto-update
          delete-branch: true