name: Check Commit Messages

on:
  pull_request:


jobs:
  length:
    name: Check that length of commit messages are <72 characters
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Fetch branch data from origin
        run: git fetch origin
      - run: |
          COMMIT_MESSAGES=$(git log --combined --format=%s origin/$GITHUB_BASE_REF..HEAD)
          echo $COMMIT_MESSAGES
          for MESSAGE in $COMMIT_MESSAGES; do
            LENGTH=$(echo $MESSAGE | wc -c)
            if [ $LENGTH -gt 72 ]; then
              echo "Commit message \"$MESSAGE\" is too long ($LENGTH characters). Please keep commit messages under 72 characters."
              exit 1
            fi
          done