commit-lint.yml

name: Lint Workflow (Commit)

on:
  push:
    branches: '**'
  pull_request:

env:
  NODE_VERSION: lts/*

jobs:
  lint:
    name: Lint the commits
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Setup Node
        uses: actions/setup-node@v4
        with:
          node-version: ${{ env.NODE_VERSION }}
          check-latest: true

      - name: Install commitlint
        run: npm install @commitlint/cli @commitlint/config-conventional

      - name: Determine BASE commit (push)
        if: github.event_name == 'push'
        env:
          GIT_COMMIT_SHA: ${{ github.event.before }}
          GIT_DEFAULT_BRANCH: ${{ github.event.repository.default_branch }}
        run: |
          COMMIT_SHA="${GIT_COMMIT_SHA}"
          if [[ "${COMMIT_SHA}" =~ ^0+$ ]]; then
            echo "'before' is all zeros. This is likely a new branch. Finding a common ancestor with the default branch."

            DEFAULT_BRANCH="${GIT_DEFAULT_BRANCH}"
            readonly DEFAULT_BRANCH

            COMMIT_SHA="$(git merge-base --fork-point "remotes/origin/${DEFAULT_BRANCH}" || true)"
            if [ -z "${COMMIT_SHA}" ]; then
              echo "No common ancestor found, using the first commit in the repository."
              COMMIT_SHA="$(git rev-list --max-parents=0 --reverse HEAD | head -n 1)"
            fi
          fi

          readonly COMMIT_SHA
          echo "GEECORE_COMMIT_BEFORE=${COMMIT_SHA}" >> "$GITHUB_ENV"

      - name: Determine BASE commit (pull request)
        if: github.event_name == 'pull_request'
        env:
          GIT_COMMIT_SHA: ${{ github.event.pull_request.base.sha }}
        run: echo "GEECORE_COMMIT_BEFORE=${GIT_COMMIT_SHA}" >> "$GITHUB_ENV"

      - name: Determine HEAD commit
        env:
          GIT_COMMIT_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
        run: echo "GEECORE_COMMIT_AFTER=${GIT_COMMIT_SHA}" >> "$GITHUB_ENV"

      - name: Run commitlint
        run: |
          npx commitlint \
            --from "${{ env.GEECORE_COMMIT_BEFORE }}" \
            --to "${{ env.GEECORE_COMMIT_AFTER }}" \
            --verbose