name: commit-validation-pr
on: [pull_request]

permissions:
  contents: read

jobs:
  check-commit-msg-length:
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v7
      with:
        fetch-depth: 0
    - name: Check commit message length
      run: |
        git log ${{ github.event.pull_request.base.sha }}..${{ github.event.pull_request.head.sha }} | (
          longlines=0
          while IFS='' read -r line; do
              if [ "${#line}" -gt 78 ] ; then
                  if echo "$line" | grep -q '^\s*https://\S*\s*$'; then
                      echo "Ignoring long line with URL."
                  else
                      echo "Overlong line: ${line}" >&2
                      if echo "$line" | grep -q 'https://'; then
                          echo "Put a long URL on a line by itself."
                      fi
                      longlines=$(( longlines + 1 ))
                  fi
              fi
          done
          [ "${longlines}" -eq 0 ]
        )