GTNH-Actions-Workflows/.github/workflows/optimize-images.yml

name: Check for image compression

on:
  workflow_call:

jobs:
  compress:
    name: Compress and make a PR if needed
    runs-on: ubuntu-24.04

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Install optipng
        run: sudo apt-get update && sudo apt-get install -y optipng

      - name: Optimize PNG files
        run: |
          find . -type f -name "*.png" ! -path "./.git/*" -exec optipng -o7 {} +
          
      - name: Check for changes
        id: git-diff
        run: |
          if [[ -n "$(git status --porcelain)" ]]; then
            echo "Everything is already correctly compressed."
            exit 0
          else
            echo "Some files aren't correctly compressed."
            exit 1
          fi
          
      - name: Create Pull Request if Needed
        if: steps.compress-images.outputs.markdown_report != ''
        if: ${{ failure() && github.event_name == 'pull_request' && !github.event.pull_request.draft }}
      run: |
        git config user.name "GitHub GTNH Actions"
        git config user.email "<>"
        git switch -c "${FIXED_BRANCH}"
        git commit -am "optimizing images"
        git push --force-with-lease origin "${FIXED_BRANCH}"
        gh pr create \
          --head "${FIXED_BRANCH}" \
          --base "${PR_BRANCH}" \
          --title "Optimising images contained in ${PR_BRANCH} for #${{ github.event.pull_request.number }}" \
          --body "Automatic image compression, applies to PR #${{ github.event.pull_request.number }}" \
          2>&1 | tee pr-message.log || true
        gh pr comment "${PR_BRANCH}" -F pr-message.log || true
      shell: 
      env:
        GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        PR_BRANCH: ${{ github.head_ref }}
        FIXED_BRANCH: ${{ github.head_ref }}-image-compression