ghpages-cleanup.yml

name: GitHub Pages Cleanup

on:
  schedule:
    - cron: 0 0 * * 6 # midnight on Saturdays
  workflow_dispatch:

jobs:
  cleanup:
    permissions:
      contents: write
    runs-on: ubuntu-latest
    steps:
      - name: Check out GitHub Pages branch
        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
        with:
          # replace `fetch-depth` with `shallow-since` if and when actions/checkout#619 (or an equivalent) gets merged
          # then remove the "Fetch a bit more history" step below
          fetch-depth: 1
          ref: gh-pages
      - name: Fetch a bit more history
        run: git fetch --update-shallow --shallow-since="32 days ago" origin gh-pages
      - name: Mark stale directories for removal
        run: |
          for dir in */; do
            [ -L "${dir%/}" ] && continue  # skip symlinks (trim trailing slash for test)
            if [ -z "$(git log -n 1 --since "1 month ago" -- "$dir")" ]; then
              echo "Removing stale directory: $dir"
              git rm --quiet -r "$dir"
            fi
          done
      - name: Configure git user
        run: |
          git config user.name 'github-actions[bot]'
          git config user.email 'github-actions[bot]@users.noreply.github.com'
      - name: Commit
        run: |
          if git diff --staged --quiet; then
            echo 'No stale directories were found. Nothing to commit.'
          else
            git commit -m 'chore: remove stale GitHub Pages branches'
          fi
      - name: Push
        run: "git push"