add_contributor.yml

name: Add new contributor to AUTHORS.md
on:
  pull_request:
    types: [opened]

jobs:
  check_contributor_exists:
    runs-on: ubuntu-latest

    outputs:
      is_contributor_in_file: ${{ steps.check_contributor_step.outputs.exists }}

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          sparse-checkout: .

      - name: Check if contributor already exists
        id: check_contributor_step
        run: |
          exists=$(grep -c -F "${{ github.event.pull_request.user.login }}" AUTHORS.md || true)
          if [[ $exists -gt 0 ]]; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi

  add_contributor:
    runs-on: ubuntu-latest
    needs: check_contributor_exists

    if: needs.check_contributor_exists.outputs.is_contributor_in_file == 'false'

    permissions:
      contents: write

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Set up Git and checkout PR's branch
        run: |
          git config --global user.name 'github-actions[bot]'
          git config --global user.email 'github-actions[bot]@users.noreply.github.com'

          git fetch origin refs/pull/${{ github.event.number }}/head:pr
          git checkout pr

      - name: Get contributor's full name and append to AUTHORS.md file
        run: |
          username=${{ github.event.pull_request.user.login }}
          full_name=$(curl -s -H "Authorization: token $GITHUB_TOKEN" "https://api.github.com/users/$username" | jq -r '.name')
          if [[ "$full_name" == "" || "$full_name" == "null" ]]; then
            full_name='-'
          fi
          echo "| $full_name | $username |" >> AUTHORS.md

      - name: Commit and push changes to the contributor's PR branch
        run: |
          git add AUTHORS.md
          git commit -m "Add ${{ github.event.pull_request.user.login }} to AUTHORS.md"
          git push origin pr:${{ github.event.pull_request.head.ref }}