goodreads-giveaway-high-count.user.js

// ==UserScript==
// @name          Goodreads high count giveaways
// @namespace     randomecho.com
// @description   Remove First Reads giveaways offering a low number of books
// @include       https://www.goodreads.com/giveaway*
// @exclude       https://www.goodreads.com/giveaway/show/*
// @grant         none
// @copyright     2014-2017 Soon Van
// @author        Soon Van - randomecho.com
// @license       http://opensource.org/licenses/BSD-3-Clause
// @version       1.4
// ==/UserScript==

var minimumBooks = 10;

function scanGiveawayListings(minimumBooks) {
  var listBooks = document.getElementsByClassName('giveawayListItem');
  listBooks = Array.prototype.slice.call(listBooks);

  for (var i = 0; i < listBooks.length; i++) {
    var bookEntry = listBooks[i];

    // Drill down to the right side of the entry
    var giveawayDetails = bookEntry.querySelectorAll('p.giveawayDetailItem');
    giveawayDetailItem = Array.prototype.slice.call(giveawayDetails); // Convert into array

    copiesCount = getAvailabilityCount(giveawayDetailItem);

    // Hide those with copies less than minimumBooks
    if (copiesCount < minimumBooks) {
      bookEntry.style.display = 'none';
    }
  }
}

function getAvailabilityCount(giveawayDetailItem) {
  for (var i = 0; i < giveawayDetailItem.length; i++) {
    if (giveawayDetailItem[i].innerText.trim().indexOf('Availability:') !== -1) {
      var giveawayAvailability = giveawayDetailItem[i].innerText.trim();
      giveawayCopies = giveawayAvailability.split('\n');

      // Grab the number from the "X copies available" text
      return parseInt(giveawayCopies[1].replace(/cop(ies|y)/i, ''), 10);
    }
  }
}

function readyFire() {
  var footerIsLoaded = document.getElementsByClassName('footer');

  if (!footerIsLoaded) {
    setTimeout(function() {readyFire()}, 1000);
  } else {
    scanGiveawayListings(minimumBooks);
  }
}

window.onload = readyFire();