books.yml

reading:
  - title: Thief (Ratcatchers, #2)
    author: Matthew Colville
    url: https://www.goodreads.com/book/show/22236375-thief
  - title: The Bear and the Nightingale (Winternight Trilogy, #1)
    author: Katherine Arden
    url: https://www.goodreads.com/book/show/25489134-the-bear-and-the-nightingale
  - title: The Coming of Conan the Cimmerian (Conan the Cimmerian, #1)
    author: Robert E. Howard
    url: https://www.goodreads.com/book/show/33482.The_Coming_of_Conan_the_Cimmerian
read:
  - title: "How to Draw Fantasy Art and RPG Maps: Step by Step Cartography for Gamers and Fans"
    author: Jared Blando
    url: https://www.goodreads.com/book/show/26107242-how-to-draw-fantasy-art-and-rpg-maps
  - title: A Princess of Mars (Barsoom, #1)
    author: Edgar Rice Burroughs
    url: https://www.goodreads.com/book/show/15987725-a-princess-of-mars
  - title: Brave New World
    author: Aldous Huxley
    url: https://www.goodreads.com/book/show/5129.Brave_New_World

goodreads.rb

require "nokogiri"
require "jekyll"
require "net/http"

class Reading < Jekyll::Generator
  DEFAULT_PARAMS = {
    v: 2,
    key: ENV.fetch("GOODREADS_KEY"),
    sort: :date_updated,
    id: ENV.fetch("GOODREADS_USER_ID"),
  }
  API_URL = URI('https://www.goodreads.com/review/list')

  def generate(site)
    reading = site.pages.detect {|page| page.name == 'reading.html'}
    reading.data["read"] = download(shelf: 'reading', per_page: 3, sort: :date_read)
    reading.data["reading"] = download(shelf: 'currently-reading')
  end

  def download(params)
    uri = API_URL
    uri.query = URI.encode_www_form(DEFAULT_PARAMS.merge(params))

    res = Net::HTTP.get_response(uri)
    if !res.is_a?(Net::HTTPSuccess)
      raise res.inspect
    end
    xml = Nokogiri::XML(res.body)

    books = []
    xml.css('review').each do |book|
      date_updated = book.at_css("date_updated").text
      if !date_updated || Date.parse(book.at_css("date_updated").text) > Date.today - 42 # 6 weeks
        books << {
          'title' => book.at_css('title_without_series').text,
          'author' => book.at_css('author name').text,
          'url' => book.at_css('link').text,
        }
      end
    end
    books
  end
end