auto-update-theme.yaml

name: Update Hugo theme submodule

on:
  push:
    branches:
      - main

permissions:
  contents: write # enable write permission for the workflow

jobs:
  update-submodule:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          submodules: true

      - name: Update Hugo theme submodule
        run: |
          git submodule update --remote --merge

      - name: Commit submodule updates if there are changes
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
          git add themes/book
          # Only commit if there are changes
          if ! git diff --cached --quiet; then
            git commit -m "CI: Update Hugo theme submodule to latest"
            git push origin main
          else
            echo "No changes to commit"
          fi