Show the total number of questions per difficulty in LeetCode's statsbar.
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// ==UserScript==
// @name Better Statsbar (LeetCode)
// @description Show the total number of questions per difficulty in LeetCode's statsbar.
// @namespace https://greatest.deepsurf.us/en/users/128831-marvinyan
// @match https://leetcode.com/problemset/algorithms/
// @grant GM.getValue
// @grant GM.setValue
// @grant GM_getValue
// @grant GM_setValue
// @require https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js
// @require https://greatest.deepsurf.us/scripts/374849-library-onelementready-es6/code/Library%20%7C%20onElementReady%20ES6.js?version=649483
// @version 0.0.1.20190108010704
// ==/UserScript==
(() => {
const LC_ALGO_API = 'https://leetcode.com/api/problems/algorithms/';
const CACHE_DURATION_MS = 10 * 1000; // Optional rate limit (default: 10s)
const CURRENT_TIME_MS = new Date().getTime();
const getData = async url => {
const lastCheck = await GM.getValue('lastCheck', Number.MAX_VALUE);
const cachedJsonStr = await GM.getValue('cachedJsonStr', null);
const timeSinceCheck = CURRENT_TIME_MS - lastCheck;
return new Promise(resolve => {
if (timeSinceCheck < CACHE_DURATION_MS && cachedJsonStr !== null) {
resolve(cachedJsonStr);
} else {
const xhr = new XMLHttpRequest();
xhr.open('GET', url, true);
xhr.onload = () => {
if (xhr.status >= 200 && xhr.status < 300) {
GM.setValue('lastCheck', CURRENT_TIME_MS);
GM.setValue('cachedJsonStr', xhr.responseText);
resolve(xhr.responseText);
}
};
xhr.send();
}
});
};
const parseData = response => {
const counts = [0, 0, 0];
const questions = JSON.parse(response).stat_status_pairs;
questions.forEach(q => {
counts[q.difficulty.level - 1]++;
});
return counts;
};
const updateStatsBar = counts => {
const statsBar = $('#welcome > span > span');
let $totalSolvedSpan = $(statsBar[0]).closest('span');
const newText = $totalSolvedSpan.text().replace('/', ' / ');
$totalSolvedSpan.text(newText);
for (let i = 1; i < statsBar.length; i++) {
statsBar[i].append(` / ${counts[i - 1]}`);
}
};
const run = async () => {
const data = await getData(LC_ALGO_API);
const counts = parseData(data);
updateStatsBar(counts);
};
waitForKeyElements('#welcome', run);
})();