pr-auto-assign.yml

name: "Auto assign PR reviewers"
on:
  pull_request_target:
    types: [opened, ready_for_review, reopened]

permissions:
  pull-requests: write

jobs:
  add-reviews:
    if: ${{ join(github.event.pull_request.requested_reviewers.*.login, ',') == '' && github.event.pull_request.draft == false }}
    runs-on: ubuntu-latest
    steps:
      - uses: actions/github-script@v6
        with:
          script: |
            const reviewers = ['mstoykov', 'codebien', 'olegbespalov', 'oleiade'];
            const reviewerCount = 2;
            const crypto = require("node:crypto");

            const getNRandom = (n, array) => {
              let result = new Array();
              for (;n > 0 && array.length > 0; n--) {
                const chosen = array[crypto.randomInt(array.length)];
                result.push(chosen);
                array = array.filter(el => el != chosen);
              }
              return result;
            }
            const reviewersWithoutAuthor = reviewers.filter(user => user !== context.payload.pull_request.user.login);

            github.rest.pulls.requestReviewers({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.payload.pull_request.number,
              reviewers: getNRandom(reviewerCount, reviewersWithoutAuthor),
            });