format-code.yml

name: Format Code
on: push

jobs:
    format:
        runs-on: ubuntu-20.04

        steps:
            - name: Pull Repo
              uses: actions/checkout@v2
              with:
                  fetch-depth: 0
                  ref: ${{ github.event.pull_request.head.ref }}
            - name: Install Prettier
              env:
                  PRETTIER_VERSION: 2
              run: |
                  sudo npm i -g prettier@$PRETTIER_VERSION
            - name: Format
              run: |
                  # don't format if there's no .prettierrc file
                  if [ ! -f .prettierrc ]; then
                    echo ".prettierrc not found"
                    echo "terminating workflow..."
                    exit 1;
                  fi

                  prettier --check . --ignore-unknown --write
            - name: Push Back Formatted Code
              run: |
                  # configure git
                  git config user.name github-actions[bot]
                  git config user.email 41898282+github-actions[bot]@users.noreply.github.com

                  git add .
                  git commit -m "(CI) format code" || echo "nothing to commit"
                  git push