Flowreader Colorful Listview

flowread-colorful-listview.user.js

// ==UserScript==
// @name        Flowreader Colorful Listview
// @namespace   http://flowreader.colorful.list.view
// @description Colorizes items headers based on their source
// @include     http*://flowreader.com/*
// @version     0.2.0
// @grant       GM_addStyle
// ==/UserScript==

const colors = {};

const computeColor = (title) => {
  let h = 0;

  for (let i = 0; i < title.length; i++) {
    let s = i !== 0 ? title.length % i : 1;
    let r = s !== 0 ? title.charCodeAt(i) % s : title.charCodeAt(i);
    h += r;
  }

  let hs = {
    h: (h % 36 + 1) * 10,
    s: 30 + (h % 5 + 1) * 10,
  };

  colors[title] = hs;

  return hs;
};

GM_addStyle(`
  .item .timeago { color: #444 !important; }
  .item .heading .author a { color: #444 !important; font-weight: bold !important; }
`);

const timeline = document.getElementById("contentHolder");
timeline.addEventListener("DOMNodeInserted", function () {
  const elements = document.getElementsByClassName('item');
  Array
    .from(elements)
    .filter(el => !el.getAttribute('colored'))
    .filter(el => el.querySelector('div.author'))
    .map(el => {
      const title = el.querySelector('div.author').textContent;
      el.setAttribute('colored', title);
      return title;
    })
    .forEach((title) => {
      if (!colors[title]) {
        const color = computeColor(title);
        GM_addStyle(`
          div[colored='${title}'] {
            background: hsl(${color.h},${color.s}%,80%) !important; }
          div[colored='${title}']:hover {
            background: hsl(${color.h},${color.s}%,85%) !important; }
          div[colored='${title}']//a[contains(@class, 'read')] {
            background: hsl(${color.h},${color.s}%,90%) !important; }
          div[colored='${title}']//a[contains(@class, 'read')]:hover {
            background: hsl(${color.h},${color.s}%,95%) !important; }
        `);
      }
    });
}, false);