check_no_open_pr.yml

name: Cross-PR Checks
on:
  pull_request_target:

jobs:
  check_cross_prs:
    runs-on: ubuntu-latest
    name: Check Cross PRs
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: List open PRs based on the same branch
        id: list_prs
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          BRANCH_NAME=${{ github.head_ref }}

          REPO_NAME=${{ github.repository }}

          PR_LIST=$(gh pr list --repo $REPO_NAME --head $BRANCH_NAME)

          PR_COUNT=$(echo "$PR_LIST" | wc -l)
          echo "PR_COUNT=$PR_COUNT" >> $GITHUB_ENV

      - name: Fail if there are more than one PRs open
        id: fail_multiple_prs
        run: |
          if [ $PR_COUNT -gt 1 ]; then
            echo "There are $PR_COUNT open PRs from the same branch. Please close them before merging this PR."
            exit 1
          fi