MemriseStatistics.user.js

// ==UserScript==
// @name         Add statistics to Memrise
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.memrise.com/home/
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    $.getJSON("https://www.memrise.com/ajax/courses/dashboard/?courses_filter=with_goal&limit=100").then(
        function(info) {
            var courses_stat = info.courses.map(function(e) { return { id: e.id, learned: e.learned, points: e.goal.points };});

            var full_stats = $("div.profile-content > div.content-stats");
            var day_stats = full_stats.clone();

            var full_words = + full_stats.find(".number")[0].innerText.replace(",","");
            var full_points = + full_stats.find(".number")[1].innerText.replace(",","");

            var days_stats = localStorage["days_stats"] ? JSON.parse(localStorage["days_stats"]) : null;

            var todays_date = new Date();
            var yesterday_date = new Date();
            yesterday_date.setDate(todays_date.getDate() - 1);

            if (days_stats) {
                if ((new Date(days_stats[0].date)).setHours(0,0,0,0) == todays_date.setHours(0,0,0,0)) {
                    days_stats.shift(-1);
                }
            } else {
                days_stats = [
                    {
                        date: yesterday_date,
                        words: full_words,
                        points: full_points,
                        courses: courses_stat.map(function(e) { return { id: e.id, learned: e.learned, points: 0 };})
                    }];
            }
            days_stats.unshift({
                date: todays_date,
                words: full_words,
                points: full_points,
                courses: courses_stat
            });

            localStorage.setItem("days_stats", JSON.stringify(days_stats));

            day_stats.find(".number")[0].innerText = days_stats[0].words - days_stats[1].words;
            day_stats.find(".number")[1].innerText = days_stats[0].points - days_stats[1].points;

            full_stats.parent().append(day_stats);

            addCountsToCourses($(".course-card-container.js-course-card-container").toArray());

            $("#content > div > div.tabbed-main.page > section > div").bind("DOMNodeInserted", function(e) {
                var newElements = null;
                // One element added.
                if (e.target.className === "course-card-container js-course-card-container") {
                    newElements = [ e.target ];
                }
                // All element added.
                if (e.target.childElementCount != 0 && e.target.firstElementChild.className === "course-card-container js-course-card-container") {
                    newElements = $(e.target.children).map(function(i, el) { return el; }).toArray();
                }
                addCountsToCourses(newElements);
            });
        });

    function addCountsToCourses(elements) {
        if (elements) {
            var days_stats = localStorage["days_stats"] ? JSON.parse(localStorage["days_stats"]) : null;

            elements.forEach(function(el) {
                var courseId = + el.id.split("-")[1];

                var today_course_stat = days_stats[0].courses.filter(function(el) { return el.id == courseId;});
                var yesterday_course_stat = days_stats[1].courses.filter(function(el) { return el.id == courseId;});

                if (today_course_stat.lenght != 0 && yesterday_course_stat.length != 0) {
                    var field = $(el).find("div.card-main-container > div > div > div.wrapper > div > div.right");

                    field.text(field.text() + " (" +(today_course_stat[0].learned - yesterday_course_stat[0].learned) +" words, " +
                                today_course_stat[0].points +" points today)");
                }
            });
        }
    }
})();