github moments helper

githubMomentsHelper.js

// ==UserScript==
// @name         gayhub moments helper
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://github.com/
// @grant        none
// ==/UserScript==

const TYPES = {
    FORK: 'fork',
    FOLLOW: 'follow',
    WATCH_STARTED: 'watch_started'
};

const rules = {
    // linpingchuan: Object.values(TYPES)
};

const debug = true;

const print = (...args) => {
    if (debug) {
        console.log.apply(null, args);
    }
};

const findContainer = () => {
    const parentClass = 'news';
    return document.getElementsByClassName(parentClass)[0];
};

const listenMomentsSeeded = (parent, cb) => {
    var config = { childList: true };
    var observer;
    var callback = mutationsList => {
        let typeMatch = ({ type }) => type === 'childList';
        let target = mutationsList.find(typeMatch);
        if (target === null || target === undefined) {
            return;
        }
        let seedNumber = target.addedNodes.length;
        print(`${seedNumber} child nodes append`);
        if (seedNumber > 1) {
            cb && cb();
            print('true moments content seeded');
        }
    };
    observer = new MutationObserver(callback);
    observer.observe(parent, config);
};

const matchRules = div => {
    const USER_TAG_IN_MOMENT_ITEM =
        'div.d-flex.flex-items-baseline > div > a.link-gray-dark.no-underline.text-bold.wb-break-all';
    let tag = div.querySelector(USER_TAG_IN_MOMENT_ITEM);
    if (!!tag) {
        let types = rules[tag.innerHTML];
        if (!!types) {
            return arrayCross(div.className.split(' '), types);
        }
    }
    return false;
};

const arrayCross = (arr1, arr2) => {
    for (let element of arr1) {
        if (arr2.includes(element)) {
            return true;
        }
    }
    return false;
};

const applyRules = container => () => {
    const deleteSelf = node => node.remove();
    [].concat(...container.children).filter(matchRules).forEach(deleteSelf);
};

(function () {
    'use strict';
    const container = findContainer();
    listenMomentsSeeded(container, applyRules(container));
})();