AdditionsForGitHubPR.js

(() => {
  const interval = 2000;
  const markAttribute = "data-diff-additions-only";
  const process = () => {
    let additionsOnly = /[\?&]diff-additions-only=true/.test(window.location.search);
    let controller = document.querySelectorAll("#files_bucket > div.pr-toolbar .pr-review-tools .BtnGroup").forEach(btnGroup => {
      if (btnGroup.hasAttribute(markAttribute)) {
        return;
      }
      btnGroup.setAttribute(markAttribute, true);
      if (additionsOnly) {
        btnGroup.innerHTML =
          '<button type="button" class="btn btn-sm btn-outline BtnGroup-item tooltipped tooltipped-s bg-gray-light text-gray-light" aria-label="Viewing additions only" disabled="">Additions</button>' +
          '<a class="btn btn-sm btn-outline BtnGroup-item tooltipped tooltipped-s" href="./files?diff=unified" aria-label="View diff in unified mode">Unified</a>' +
          '<a class="btn btn-sm btn-outline BtnGroup-item tooltipped tooltipped-s" href="./files?diff=split" aria-label="View diff in split mode">Split</a>';
      } else {
        btnGroup.innerHTML =
          '<a class="btn btn-sm btn-outline BtnGroup-item tooltipped tooltipped-s" aria-label="View additions only" href="./files?diff=unified&diff-additions-only=true">Additions</a>' +
          btnGroup.innerHTML;
      }
    });

    if (additionsOnly) {
      document.querySelectorAll(".blob-num-deletion").forEach(cell => {
        cell.parentElement.style.display = "none";
      });
    }
    window.setTimeout(process, interval);
  };
  process();
})();