name: Commitlint

on: [pull_request]

jobs:
  lint-commits:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - uses: actions/setup-node@v2
        with:
          node-version: '14'

      # https://github.com/pnpm/action-setup#use-cache-to-reduce-installation-time
      - name: Cache pnpm modules
        uses: actions/cache@v2
        with:
          path: ~/.pnpm-store
          key: ${{ runner.os }}-${{ hashFiles('**/pnpm-lock.yaml') }}
          restore-keys: |
            ${{ runner.os }}-

      - uses: pnpm/action-setup@v2.0.1
        with:
          version: 6.0.2
          run_install: false

      - name: Install commitlint
        run: pnpm add -g @commitlint/{cli,config-conventional}

      - name: Commitlint
        run: commitlint --from HEAD~${{ github.event.pull_request.commits }} --to HEAD