label.yml

name: Add Tags to PRs for New Contributors

on:
  pull_request:
    types:
      - opened

jobs:
  add_tags:
    runs-on: ubuntu-latest

    steps:
      - name: Check if contributor is new
        id: check_new_contributor
        run: |
          contributor_username=$(jq -r '.pull_request.user.login' $GITHUB_EVENT_PATH)
          labels=$(curl -s -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
            "https://api.github.com/repos/${GITHUB_REPOSITORY}/contributors?anon=true")
          if [[ $(echo $labels | jq --arg contributor "$contributor_username" \
            '.[] | select(.login==$contributor)') == "" ]]; then
            echo "New contributor detected."
            echo "::set-output name=new_contributor::true"
          else
            echo "Existing contributor."
            echo "::set-output name=new_contributor::false"
          fi
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          
      - name: Add tags for new contributors
        if: steps.check_new_contributor.outputs.new_contributor == 'true'
        run: |
          pr_number=$(jq -r '.pull_request.number' $GITHUB_EVENT_PATH)
          tag_name="new-contributor"
          curl -X POST -s -H "Authorization: Bearer ${{ secrets.GITHUB_TOKEN }}" \
            -d "{\"labels\":[\"$tag_name\"]}" \
            "https://api.github.com/repos/${GITHUB_REPOSITORY}/issues/$pr_number/labels"
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}