github-pr-helpers.js

// ==UserScript==
// @name         Github PR Helpers
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Additional tools for reviewing PRs
// @author       @jayw
// @match        https://YOURGITTHINGY/*/*/pull/*/files*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    document.querySelector(".diffbar-item.diffstat").innerHTML += [
        `<button type="button" class="btn btn-sm" id="btn-toggle-whitespace">Toggle Whitespace</button>`,
        `<button type="button" class="btn btn-sm" id="btn-collapse-expand">Collapse/Expand</button>`,
        `<button type="button" class="btn btn-sm" id="btn-expand-hunks">Expand Hunks</button>`].join('\n');

    document.querySelector('#btn-toggle-whitespace').onclick = () => {
        if (window.location.href.includes('?w=1')) {
            window.location.href = window.location.href.replace('?w=1', '')
        } else {
            window.location.href += '?w=1';
        }
    }
    document.querySelector('#btn-collapse-expand').onclick = () => document.querySelectorAll('.js-details-target').forEach(x => x.click());
    document.querySelector('#btn-expand-hunks').onclick = () => document.querySelectorAll('.js-expand').forEach(x => x.click());
    console.log('loaded github pr helpers');
})();