update-hugo.yml

name: Update Hugo version

on:
  schedule:
    - cron: "0 0 * * 1" # Runs every Monday at midnight
  workflow_dispatch:

jobs:
  check-and-update-hugo:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          # Otherwise, the token used is the GITHUB_TOKEN, instead of your personal
          # access token
          persist-credentials: false
          # Otherwise, there would be errors pushing refs to the destination repository
          fetch-depth: 0

      - name: Get current Hugo version
        id: get_current_hugo_version
        run: |
          current_version=$(grep 'HUGO_VERSION:' .github/workflows/ci.yml | awk '{print $2}')
          echo "Current Hugo version is ${current_version}"
          echo "CURRENT_HUGO_VERSION=${current_version}" >> "${GITHUB_ENV}"

      - name: Fetch latest Hugo version
        id: fetch_latest_hugo_version
        run: |
          latest_version=$(curl --silent "https://api.github.com/repos/gohugoio/hugo/releases/latest" \
            | jq -r .tag_name | sed 's/v//')
          echo "Latest Hugo version is ${latest_version}"
          echo "LATEST_HUGO_VERSION=${latest_version}" >> "${GITHUB_ENV}"

      - name: Check if update is needed
        id: check_update
        run: |
          if [[ "${LATEST_HUGO_VERSION}" == "${CURRENT_HUGO_VERSION}" ]]; then
            echo "Hugo is up to date. No update needed."
            echo "hugo_update_needed=false" >> "${GITHUB_ENV}"
            exit 0
          else
            echo "Hugo needs updating from ${CURRENT_HUGO_VERSION} to ${LATEST_HUGO_VERSION}."
            echo "hugo_update_needed=true" >> "${GITHUB_ENV}"
          fi

      - name: Update Hugo version in ci.yml
        if: env.hugo_update_needed == 'true'
        run: |
          sed -i "s/HUGO_VERSION: ${CURRENT_HUGO_VERSION}/HUGO_VERSION: ${LATEST_HUGO_VERSION}/g" \
            .github/workflows/ci.yml

      - name: Install updated Hugo version
        if: env.hugo_update_needed == 'true'
        run: |
          wget -O hugo.deb \
            "https://github.com/gohugoio/hugo/releases/download/v${{ env.LATEST_HUGO_VERSION }}/hugo_${{ env.LATEST_HUGO_VERSION }}_linux-amd64.deb"
          sudo dpkg -i hugo.deb

      - name: Build site with updated Hugo
        if: env.hugo_update_needed == 'true'
        run: |
          git submodule update --init --recursive
          npm ci || true
          hugo --gc --minify
        continue-on-error: false

      - name: Commit version update
        if: success() && env.hugo_update_needed == 'true'
        run: |
          git config user.name "GitHub Actions"
          git config user.email "actions@github.com"
          git commit -am "Update Hugo version to ${LATEST_HUGO_VERSION}"

      - name: Push changes
        if: success() && env.hugo_update_needed == 'true'
        uses: ad-m/github-push-action@master
        with:
          github_token: ${{ secrets.PAT_TOKEN }}
          branch: ${{ github.ref }}