UserScript that helps you duplicate Google Calendar events quickly

google-calendar-automate-duplication.user.js

// ==UserScript==
// @name         google-calendar-automate-duplication
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Automate duplication of events
// @author       Yuri Bochkarev
// @match        https://calendar.google.com/calendar/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    const DELAY = 500;
    const STYLE_ACTIVE = "margin-left: 10px; font-size: 20px; font-weight: bold; color: red;";
    const STYLE_INACTIVE = "margin-left: 10px; font-size: 20px; font-weight: normal; color: grey;";
    //var currentWeek;
    var currentDay;
    //var toggle;
    var isActive = false;

    function createToggle() {
        let header = document.querySelector('[aria-label="Calendar"]');
        let d = document.createElement('a');
        d.style = STYLE_INACTIVE;
        d.onclick = function() {
            isActive = !isActive;
            if (isActive) { this.style = STYLE_ACTIVE; }
            else { this.style = STYLE_INACTIVE; }
        }
        d.innerHTML = 'D'
        header.appendChild(d);
        return d
    }

    function getCurrentWeek() {
        for (let div of document.querySelectorAll('div')) {
            if (div.innerText.startsWith('Week ')) {
                return div.innerText;
            }
        }

        return null;
    }

    function getCurrentDay() {
        let mini = document.querySelector('[data-month]')
        if (mini) return mini.querySelector('[aria-selected=true]');
    }

    function app() {
        createToggle();

        var saveClicker = setInterval(function () {
            if (!isActive) return;
            var saveButton = document.querySelector('div[aria-label=Save]');
            if (saveButton == null) return;
            saveButton.click();
            setTimeout(function() { currentDay.click(); }, DELAY);

            //var scrollToCurrentWeek = setInterval(function() {
            //    if (currentWeek == getCurrentWeek()) { clearInterval(scrollToCurrentWeek); return; }
            //    var nextWeekButton = document.querySelector('div[aria-label="Next week"]');
            //    if (nextWeekButton) { nextWeekButton.click(); return; }
            //    clearInterval(scrollToCurrentWeek);
            //}, 500);

        }, DELAY);

        var simulateClick = function(element) {
            // Simulate mouse down
            element.dispatchEvent(new MouseEvent("mousedown", { bubbles: true, cancelable: true, view: window }));
            // Simulate mouse release
            element.dispatchEvent(new MouseEvent("mouseup", { bubbles: true, cancelable: true, view: window }))
        }

        var optionsClicker = setInterval(function () {
            if (!isActive) return;
            var optionsButton = document.querySelector('div[aria-label=Options]');
            var duplicateButton = document.querySelector('span[aria-label=Duplicate]');

            if (optionsButton != null && duplicateButton == null) {
                optionsButton.click();
            } else if (optionsButton != null && duplicateButton != null) {
                //currentWeek = getCurrentWeek();
                currentDay = getCurrentDay();
                simulateClick(duplicateButton);
            }
        }, DELAY);
    }

    if (document.readyState === "complete" ||
        (document.readyState !== "loading" && !document.documentElement.doScroll)
       ) {
        app();
    } else {
        document.addEventListener("DOMContentLoaded", app);
    }
})();