// ==UserScript==// @name         YouTube - Recommend certain Categories only on home page// @namespace    http://tampermonkey.net/// @version      1.0.11// @description  Selects desired categories on Youtube Homepage and hides undesired ones. To minimise distraction and increase productivity.// @author       lookjaklook// @match        *://*.youtube.com// @match        *://*.youtube.com/// @match        *://*.youtube.com/?*// @match        *://youtube.com// @match        *://youtube.com/// @match        *://youtube.com/?*// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com// @grant        none// @license MIT// ==/UserScript==var categories = ['programming', 'development', 'computer science','electronic circuits', 'physics','mathematics', 'algorithms','python', 'c++']; // Here you can choose the categories you wish to see and to be chosen automatically/*=== Main functionality that runs at start ===*/main();/*=== Main functionality functions ===*/function main() {console.log('YOUTUBE_CATEGORIES: started');hideHomeRecommendedContent(true);removeAllIrrelevantCategoriesFromDom({runAgainAfterMillisec: 100});mak###reToSwitchCategoryFromDefaultToDesired({runAgainAfterMillisec: 1000});}function removeAllIrrelevantCategoriesFromDom({runAgainAfterMillisec, turnOffDebug}) {waitForElm('yt-chip-cloud-chip-renderer, ytm-chip-cloud-chip-renderer').then((domR###lt) => {const allCategoriesDomArr = domR###lt.multiple;const hiddenCategoryNames = [];allCategoriesDomArr.forEach((categoryDom) => {const categoryName = normalizeName(categoryDom.innerText);let isCategoryRelevant = false;categories.some((category) => {const relevantCategoryName = normalizeName(category);isCategoryRelevant = categoryName.includes(relevantCategoryName);return isCategoryRelevant;});categoryDom.style.display = (isCategoryRelevant ? '' : 'none');if (!isCategoryRelevant)hiddenCategoryNames.push(categoryName);});if (!turnOffDebug)console.log(`YOUTUBE_CATEGORIES: hidden categories: ${hiddenCategoryNames}`);if (runAgainAfterMillisec)setTimeout(function() {removeAllIrrelevantCategoriesFromDom({runAgainAfterMillisec: runAgainAfterMillisec, turnOffDebug: true})}, runAgainAfterMillisec);});}var isStartedCategorySwitch = false;function mak###reToSwitchCategoryFromDefaultToDesired({runAgainAfterMillisec}) {waitForElm(getSelectedCategoryDomCssSelectorStr()).then((domR###lt) => {if (runAgainAfterMillisec)setTimeout(() =>mak###reToSwitchCategoryFromDefaultToDesired({runAgainAfterMillisec: runAgainAfterMillisec}),runAgainAfterMillisec);let isDefaultCategorySelected;const selectedCategoryDomArr = domR###lt.multiple;if (selectedCategoryDomArr.length < 1 || isStartedCategorySwitch)return;isDefaultCategorySelected = true;Array.from(selectedCategoryDomArr).some((selectedCategoryDom) => {const selectedCategoryName = normalizeName(selectedCategoryDom.innerText);isDefaultCategorySelected = (selectedCategoryName === 'all');return (!isDefaultCategorySelected);});if (!isDefaultCategorySelected)return;console.log('YOUTUBE_CATEGORIES: current category is "all", switching category');startCategorySwitch();})}var currSelectedCategory;function startCategorySwitch() {if (isStartedCategorySwitch)return;currSelectedCategory = null;isStartedCategorySwitch = true;hideHomeRecommendedContent(true);selectRandomRecommendedCategoryUntilSucceed();}function selectRandomRecommendedCategoryUntilSucceed() {const categorySelectionInterval = setInterval(selectUnselectedCategory, 10)function selectUnselectedCategory() {if (currSelectedCategory && isSelectedCategoryNameMatches(currSelectedCategory))return;let desiredCategory;do {desiredCategory = normalizeName(categories.random());} while (isSelectedCategoryNameMatches(desiredCategory));if (isSelectedCategoryNameMatches(desiredCategory))return;currSelectedCategory = desiredCategory;const isDesiredCategorySelected = selectCategory(desiredCategory).isCategoryFoundAndClicked;if (!isDesiredCategorySelected) {currSelectedCategory = null;return;}const timeUntilOldCategoryContentIsReplacedByNew = 2000;setTimeout(() => hideHomeRecommendedContent(false), timeUntilOldCategoryContentIsReplacedByNew);isStartedCategorySwitch = false;clearInterval(categorySelectionInterval);}}function selectCategory(category) {const returnObject = {isCategoryFoundAndClicked: true};const xpathTextLowerCase = "translate(., 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz')";const xpathCategoryForDesktop = '//yt-chip-cloud-chip-renderer[contains(' + xpathTextLowerCase + ', "' + category + '")]';const xpathCategoryForMobile = xpathCategoryForDesktop.replace('//yt-', '//ytm-');let categoryDom = getElementByXpath(xpathCategoryForDesktop);if (!categoryDom)categoryDom = getElementByXpath(xpathCategoryForMobile);if (categoryDom) {categoryDom.click();console.log(`YOUTUBE_CATEGORIES: clicked on desired category "${category}"`);returnObject.isCategoryFoundAndClicked = true;}elsereturnObject.isCategoryFoundAndClicked = false;return returnObject;}function isSelectedCategoryNameMatches(categoryName) {const selectedCategoryDomArr = getSelectedCategoryDomArr();selectedCategoryDomArr.forEach((selectedCategoryDom) => {const selectedCategoryName = normalizeName(selectedCategoryDom.innerText);if (selectedCategoryName.includes(categoryName))return true;});return false;}function hideHomeRecommendedContent(isHide) {waitForElm('ytd-two-column-browse-r###lts-renderer #contents, .rich-grid-renderer-contents').then((domR###lt) => {const homeContentDom = domR###lt.single;homeContentDom.style.visibility = isHide ? 'hidden' : '';});}function getSelectedCategoryDomArr() {return document.querySelectorAll(getSelectedCategoryDomCssSelectorStr());}function getSelectedCategoryDomCssSelectorStr() {return 'yt-chip-cloud-chip-renderer.iron-selected, ytm-chip-cloud-chip-renderer.selected';}/*=== Extensions ===*/function waitForElm(selector) {return new Promise(resolve => {if (document.querySelector(selector)) {return resolve({single: document.querySelector(selector), multiple: document.querySelectorAll(selector)});}const observer = new MutationObserver(mutations => {if (document.querySelector(selector)) {resolve({single: document.querySelector(selector), multiple: document.querySelectorAll(selector)});observer.disconnect();}});observer.observe(document.body, {childList: true,subtree: true});});}function getElementByXpath(path) {return document.evaluate(path, document, null, XPathR###lt.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;}function normalizeName(text) {return text.toLowerCase().trim();}Array.prototype.random = function () {return this[Math.floor((Math.random()*this.length))];}