WordPress.com Stats Sparkline

Adds a stats sparkline to the WordPress.com admin bar
Wrap lines
// ==UserScript==
// @name        WordPress.com Stats Sparkline
// @namespace   tpenguinltg
// @description Adds a stats sparkline to the WordPress.com admin bar
// @include     https://*.wordpress.com/*
// @version     1.2.0
// @homepageURL https://gf.qytechs.cn/en/scripts/26076-wordpress-com-stats-sparkline
// @homepageURL https://github.com/tpenguinltg/wpcom-stats-sparkline
// @grant       none
// @license     MPLv2.0; http://mozilla.org/MPL/2.0/
// @copyright   2016-2019, tPenguinLTG (http://tpenguinltg.wordpress.com/)
// ==/UserScript==
 
// Function by dystroy. From http://stackoverflow.com/a/14388512
function fetchJSONFile(path, callback, fallback) {
  var httpRequest = new XMLHttpRequest();
  httpRequest.onreadystatechange = function() {
    if (httpRequest.readyState === 4) {
      if (httpRequest.status === 200) {
        if (callback) callback(JSON.parse(httpRequest.responseText));
      } else if (fallback) {
        fallback();
      }
    }
  };
  httpRequest.open('GET', path);
  httpRequest.send();
}
 
function addSparkline(src, statsUrl) {
  var sparklineImage = document.createElement("img");
  sparklineImage.src = src;
  sparklineImage.alt = "Stats";
  sparklineImage.title = "Showing site views per hour for the last 48 hours. Click for full Site Stats.";
  sparklineImage.style.paddingTop = "4px";
  sparklineImage.style.paddingBottom = "4px";
 
  var statsLink = document.createElement("a");
  statsLink.appendChild(sparklineImage);
  statsLink.href = statsUrl;
  statsLink.className = "ab-item";
 
  var menuItem = document.createElement("li");
  menuItem.appendChild(statsLink);
 
  document.getElementById("wp-admin-bar-root-default").appendChild(menuItem);
}
 
window.onload = function() {
  var statsUrl = document.querySelector("#wp-admin-bar-blog a.ab-item").href;
  if (!statsUrl) return;
 
  var blogDomain = statsUrl.replace(/\/+$/, "").split("/").pop();
 
  // target:  https://example.wordpress.com/wp-includes/charts/admin-bar-hours-scale.php
  var sparklineImageSrc = "//" + blogDomain + "/wp-includes/charts/admin-bar-hours-scale.php";
  addSparkline(sparklineImageSrc, statsUrl);
}
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