Better experience for CNN Lite website

better-cnn-lite.user.js

// ==UserScript==
// @name          Better CNN Lite
// @namespace     https://github.com/maman
// @version 		  1.0.0
// @downloadURL   https://gist.githubusercontent.com/maman/21288c00d8b53e855604b3acde74e902/raw/better-cnn-lite.user.js
// @match         *://lite.cnn.io/*
// ==/UserScript==

/*eslint-disable*/
/* axios v0.16.2 | (c) 2017 by Matt Zabriskie */
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/*eslint-enable*/

const pageCache = {};

const content = document.querySelector('main');
const pageInfo = { title: null, url: location.href};

let prevScroll = 0;

const changeToArray = nodeLists => Array.prototype.slice.call(nodeLists);

/** Load page from url / cache if available */
const loadNextPage = pageInfoObject => {
  const parseHTML = documentString => {
    const parser = new DOMParser();
    return Promise.resolve(parser.parseFromString(documentString, 'text/html'));
  }
  const fetchPage = url => axios.get(url)
    .then(result => result.data)
    .then(htmlString => {
      const parsedHTML = parseHTML(htmlString);
      pageCache[url] = parsedHTML;
      return parsedHTML;
    });
  const pageLoader = pageCache[pageInfoObject.url] ? Promise.resolve(pageCache[pageInfoObject.url]) : fetchPage(pageInfoObject.url);
  prevScroll = document.scrollTop;
  return pageLoader
    .then(nextPage => {
      const nextContent = nextPage.querySelector('main');
      content.innerHTML = nextContent.innerHTML;
      content.title = nextPage.title;
      window.scrollTo(0, 0);
    })
    .catch(err => {
      console.log('Cannot load page', err);
      document.location.href = pageInfoObject.url;
      return false;
    })
}

/** Change links to use XHR instead of traditional links */
const changeToXHR = () => {
  const headerLinks = changeToArray(document.querySelectorAll('header a'));
  const contentLinks = changeToArray(document.querySelectorAll('main a'));
  const links = headerLinks.concat(contentLinks);
  console.log(links);
  const linkHandler = linkEl => e => {
    e.preventDefault();
    const newPageInfo = Object.assign({}, pageInfo, {
      title: linkEl.title || '',
      url: linkEl.href,
    });
    history.pushState(pageInfo, newPageInfo.title, newPageInfo.url);
    loadNextPage(newPageInfo);
    return false;
  }
  history.replaceState(null, document.title, location.href);
  if (!links.length) return;
  links.forEach(link => {
    link.addEventListener('click', linkHandler(link))
  });
}

/** Modify web page */
const modifyWebPage = () => {
  const style = document.createElement('style');
  const documentHeader = document.querySelector('header');
  documentHeader.innerHTML = documentHeader.innerHTML.split(' | ').join('');
  style.setAttribute('type', 'text/css');
  style.innerText = `body{font-family:-apple-system, Helvetica, sans-serif !important}footer,header,main{max-width:768px;margin:0 auto;padding:20px !important}header{padding:0 20px !important;color:#FFF;align-items:center;flex-direction:row;display:flex}header strong{font-style:italic;font-size:3rem;font-weight:900;margin:0}header a,header time{display:flex;text-decoration:none;position:relative}header a{margin-right:20px}header a:first-child{margin-right:10px}header a:last-child{margin-right:0}div[id="published datetime"],header time{color:#ABABAB;font-weight:bold;flex-grow:1}div[id="published datetime"]{color:#797979;font-weight:normal;font-size:0.8rem}main{line-height:1.25rem}footer{font-size:0.5rem}`;
  document.head.appendChild(style);
}

const checkElement = () => {
	if (!document.querySelector('header')) {
		requestAnimationFrame(checkElement);
	} else {
		modifyWebPage();
	}
}
  

/** Init */
const init = () => {
  requestAnimationFrame(checkElement);
  changeToXHR();
  if (prevScroll !== 0) window.scrollTo(0, prevScroll);
}

/** Bootstrapping */
window.addEventListener('load', init, false);
window.onpopstate = e => {
  const newPageInfo = Object.assign({}, pageInfo, {
    title: document.title,
  });
  loadNextPage(newPageInfo).then(init);
}

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