close_invalid_prs.yml

name: Close Invalid Pull Requests

on:
  pull_request:
    types: [ opened, reopened, synchronize ]
  workflow_dispatch:

jobs:
  close_invalid_pr:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v5

      - name: Get Default Branch
        id: get-default-branch
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          DEFAULT_BRANCH=$(gh repo view --json defaultBranchRef --template '{{.defaultBranchRef.name}}')
          echo "default_branch=$DEFAULT_BRANCH" >> "$GITHUB_OUTPUT"

      - name: Close PRs from Default Branch
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          DEFAULT_BRANCH=${{ steps.get-default-branch.outputs.default_branch }}
          PR_NUMBERS=$(gh pr list --state open --json number,headRefName --template '{{range .}}{{if eq .headRefName "'"$DEFAULT_BRANCH"'"}}{{.number}} {{end}}{{end}}')

          for PR_NUMBER in $PR_NUMBERS; do
            echo "Closing PR #$PR_NUMBER from default branch '$DEFAULT_BRANCH'."
            gh pr close $PR_NUMBER --comment "This pull request is invalid because it's created from the default branch '$DEFAULT_BRANCH'. Please use a feature branch."
          done
        shell: bash