mark-duplicate-dependabot-prs.yml

name: Mark Duplicate Dependabot PRs

on:
  pull_request:
    types: [closed]

jobs:
  check_duplicate_prs:
    runs-on: ubuntu-latest
    if: github.event.pull_request.merged == true && github.event.pull_request.user.login == 'dependabot[bot]'
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v4

      - name: Extract Dependency Name from PR Title
        id: extract
        run: |
          PR_TITLE="${{ github.event.pull_request.title }}"
          DEPENDENCY_NAME=$(echo "$PR_TITLE" | awk -F ' from ' '{print $1}')
          echo "dependency_name=$DEPENDENCY_NAME" >> $GITHUB_OUTPUT

      - name: Find PRs
        id: find_duplicates
        env:
          DEPENDENCY_NAME: ${{ steps.extract.outputs.dependency_name }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PRS=$(gh pr list --search 'milestone:${{ github.event.pull_request.milestone.title }} is:merged in:title "$DEPENDENCY_NAME"' --json number --jq 'map(.number) | join(",")')
          echo "prs=$PRS" >> $GITHUB_OUTPUT

      - name: Label Duplicate PRs
        if: steps.find_duplicates.outputs.prs != ''
        env:
          PRS: ${{ steps.find_duplicates.outputs.prs }}
          CURRENT_PR_NUMBER: ${{ github.event.pull_request.number }}
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        shell: bash
        run: |
          for i in ${PRS//,/ }
          do
            if [ ! $i -eq "$CURRENT_PR_NUMBER" ]; then
              echo "Marking PR $i as duplicate"
              gh pr edit "$i" --add-label "status: duplicate"
              gh pr comment "$i" --body "Duplicate of #$CURRENT_PR_NUMBER"
            fi
          done