Toggle whitespace for Github PR

toggle_whitespace_for_github_pr.user.js

// ==UserScript==
// @name         Toggle whitespace
// @namespace    https://gist.github.com/akinov/a38822c6aaec04e8f1d1ce9fffd932f7
// @version      0.1
// @description  Diff miyasui!!
// @author       akinov
// @match        https://github.com/*/pull/*
// @grant        none
/* load jQuery */
// @require  https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js
// ==/UserScript==
(function() {
  'use strict';
  let query = convertQueryToObject();
  let buttonText = 'Hide';
  if ('w' in query) {
    buttonText = 'Show';
  }
  //location.href = updateQueryStringParameter(location.href, 'w', 1);
  const $toggeBtn = $(`<button>${buttonText} whitespace</button>`).addClass('btn btn-sm').css({
    position: 'fixed',
    right: '20px',
    top: '120px'
  }).on('click', toggleWQuery);
  $('body').append($toggeBtn);

  function toggleWQuery() {
    if ('w' in query) {
      delete query.w;
    } else {
      query.w = 1;
    }
    location.search = buildQueryString(query);
  }

  function convertQueryToObject() {
    var obj = {},
      query = location.search,
      params = query.split(/[?&]/),
      p, key, val;
    for (var i = 0, len = params.length; i < len; ++i) {
      p = params[i].split("=");
      key = normalize(p[0]);
      val = normalize(p[1]);
      if (key) {
        obj[key] = val;
      }
    }
    return obj;
  }

  function buildQueryString(obj) {
    var query = "",
      key, val;
    for (key in obj) {
      if (!obj.hasOwnProperty(key)) {
        continue;
      }
      val = obj[key];
      query += (query === "") ? "" : "&";
      query += fixedEncodeURIComponent(key) + "=";
      if (val != null) {
        query += fixedEncodeURIComponent(val);
      }
    }
    return query;
  }

  function fixedEncodeURIComponent(str) {
    return encodeURIComponent(str).replace(/[!'()]/g, escape).replace(/\*/g, "%2A");
  }

  function fixedDecodeURIComponent(str) {
    return decodeURIComponent(str.replace(/[!'()*]/g, unescape));
  }

  function normalize(arg) {
    return (!arg) ? null : fixedDecodeURIComponent(arg);
  }
})();