the redirect art/game

gistfile1.txt

#!/usr/bin/env ruby

require 'bundler/inline'

gemfile(true) do
  ruby '2.4.2'
  source 'https://rubygems.org'
  gem 'capybara'
  gem 'faraday'
end

module Game
  class CLI
    URL_PATTERN = %r(permanent-redirect.xyz/pages)
    TIME_PATTERN = 'This redirect was created at'

    def initialize(n)
      @n = n
    end

    def run
      loop do
        sleep_time = rand(1..3)
        puts format('Sleep %d ..', sleep_time)
        sleep sleep_time
        puts url
        response = Faraday.get(url)
        page = Capybara::Node::Simple.new(response.body)
        time = redirect_creation_time(page)
        n2 = next_n(page)
        puts format('%20d %30s %20d', @n, time, n2)
        @n = n2
      end
    end

    private

    def next_n(page)
      page.
        find_all('a').
        to_a.
        map { |a| a['href'] }.
        first { |href| href.match?(URL_PATTERN)}.
        split('/').
        last
    end

    def redirect_creation_time(page)
      page.find('p', text: TIME_PATTERN).text.to_s.split(TIME_PATTERN).last
    end

    def url
      format('https://permanent-redirect.xyz/pages/%d', @n)
    end
  end
end

Game::CLI.new(*ARGV).run