commit_lint.yml

name: Lint commit message

on: [pull_request]

env:
  NODE_VERSION: lts/*

jobs:
  lint-commit-message:
    runs-on: ubuntu-latest
    steps:
      - name: Compute number of commits
        id: nb-of-commits
        run: |
          echo "plusOne=$((${{ github.event.pull_request.commits }} + 1))" >> $GITHUB_OUTPUT
          echo "minusOne=$((${{ github.event.pull_request.commits }} - 1))" >> $GITHUB_OUTPUT
      - uses: actions/checkout@v3
        with:
          fetch-depth: ${{ steps.nb-of-commits.outputs.plusOne }}
          persist-credentials: false
      - run: git reset HEAD^2
      - name: Install Node.js
        uses: actions/setup-node@v3
        with:
          node-version: ${{ env.NODE_VERSION }}
      - name: Install required dependencies
        run: |
          npm install -g @commitlint/cli @commitlint/config-conventional
      - name: Validate the first commit message
        run: |
          commitlint -V --config .github/workflows/commitlint.config.js \
            --to HEAD~${{ steps.nb-of-commits.outputs.minusOne }}