commit-message.yaml

name: Commit message policy

on:
  pull_request:
    types: [opened, synchronize, reopened, edited]

permissions:
  contents: read

jobs:
  commit-message:
    name: commit-message
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
        with:
          fetch-depth: 0
          persist-credentials: false
          ref: ${{ github.event.pull_request.head.sha }}

      - name: Validate PR title and commits
        shell: bash
        env:
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
          PR_TITLE: ${{ github.event.pull_request.title }}
        run: |
          pattern='^(feat|fix|docs|ci|refactor|test|build|chore|perf|revert)(\([^)]+\))?!?:[[:space:]].+'
          failed=0

          if [[ ! "$PR_TITLE" =~ $pattern ]]; then
            printf 'Invalid PR title: %s\n' "$PR_TITLE"
            failed=1
          fi

          while IFS= read -r line; do
            sha=${line%% *}
            subject=${line#* }

            if [[ ! "$subject" =~ $pattern ]]; then
              printf 'Invalid commit message: %s %s\n' "$sha" "$subject"
              failed=1
            fi
          done < <(git log --format='%H %s' "$BASE_SHA..$HEAD_SHA")

          if (( failed )); then
            printf '%s\n' \
              'Expected: type(scope): description' \
              'Allowed types: feat, fix, docs, ci, refactor, test, build, chore, perf, revert'
            exit 1
          fi