name: Run gitlint

on: [pull_request]

jobs:
  run_gitlint:
    runs-on: ubuntu-20.04
    steps:
      - name: Checkout source code
        uses: actions/checkout@master
      - name: Install gitlint
        run: |
          sudo apt-get update
          sudo apt install gitlint
      - name: Set auth header
        if: endsWith(github.repository, 'enterprise')
        run: |
          echo 'AUTH_HEADER<<EOF' >> $GITHUB_ENV
          echo "Authorization: token ${{ secrets.CI_GIT_TOKEN }}" >> $GITHUB_ENV
          echo 'EOF' >> $GITHUB_ENV
      - name: Run gitlint
        shell: bash
        run: |
          pr_number=$(echo $GITHUB_REF | awk 'BEGIN { FS = "/" } ; { print $3 }')
          messages="$(curl --silent --show-error \
                      --header "${{ env.AUTH_HEADER }}" \
                      --header "Accept: application/vnd.github.v3+json" \
                      "https://api.github.com/repos/${GITHUB_REPOSITORY}/pulls/${pr_number}/commits")"
          len=$(echo $messages | jq length)
          result=true
          for i in $( seq 0 $(($len - 1)) ); do
            message=$(echo $messages | jq -r .[$i].commit.message)
            echo "commit message: $message"
            status=0
            echo $message | gitlint -C ./.github/workflows/.gitlint || status=$?
            if [ $status -ne 0 ]; then
              result=false
            fi
          done
          if ! ${result} ; then
            echo "Some of the commit messages are not structured as The Conventional Commits specification. Please check CONTRIBUTING.md for our process on PR."
            exit 1
          fi
          echo "success"