ego_hub.rb

require 'rubygems'
require 'hpricot'
require 'open-uri'

GITHUB = "http://github.com/"
FOLLOWER_COUNT_SELECTOR = '#repo_sub_menu li:nth-of-type(1)'
PROJECT_SELECTOR = 'li.project .title b a'

class String
  def parse_int
    scan(/\d+/).to_s.to_i
  end
end

class Array
  def invoke(method)
    map { |i| i.send(method) }
  end
  
  def sum
    inject(0) { |sum, i| sum + i }
  end
end

class Page
  def find(css)
    path = GITHUB + page
    begin
      yield Hpricot(open(path)).search(css)
    rescue OpenURI::HTTPError
      puts "An error occurred while trying to access #{path}. Exiting..."
      exit
    end
  end
end

class User < Page
  def initialize(name)
    @name = name
  end
  
  def projects
    puts "finding #{@name}'s projects"
    find(PROJECT_SELECTOR) do |result|
      count = result.map { |p| Project.new(p.inner_html, @name) }
      puts "(#{count.length} projects found)"
      count
    end
  end
  
  def total_followers
    projects.invoke(:follower_count).sum
  end
  
  def page
    @name
  end
end

class Project < Page
  def initialize(name, user)
    @name, @user = name, user
  end
  
  def follower_count
    find(FOLLOWER_COUNT_SELECTOR) do |result|
      count = result.inner_html.parse_int
      puts "   #{count} followers for #{@name}"
      count
    end
  end
  
  def page
    "#{@user}/#{@name}/info/feed"
  end
end

print "Enter the username: "
user = User.new(gets.chomp)
puts "#{user.total_followers} people are following your projects."