twitter.rb

# vim:fileencoding=utf-8
require 'rubygems' if RUBY_VERSION < '1.9'
require 'pit'
require 'nokogiri'
require 'mechanize'
require 'uri'
require 'activesupport'

Base = 'http://twitter.com/'
account = Pit.get('twitter.com')
followers_url = URI.join(Base, 'followers')

def check_enabled?
  timestamp = 'timestamp.yaml'
  last_checked = File.exist?(timestamp) ? YAML.load(File.open(timestamp)) : 5.minutes.ago
  Time.now - last_checked > 5.minutes
end

unless check_enabled?
  puts "too early"
  exit
end

ua = WWW::Mechanize.new
ua.get(followers_url) do |page|
  followers_page = page.form_with(:action => 'https://twitter.com/sessions') do |f|
    f['session[username_or_email]'] = account['login']
    f['session[password]'] = account['password']
  end.click_button

  # followers_url
  h2 = followers_page.at('//h2').inner_text
  numbers = if /Your (\d+) Followers/ =~ h2 then $1.to_i else 0 end
  n = numbers/20 + 1
  followers = (1..n).inject([]) do |followers, i|
    followers_url.query = "page=#{i}"
    puts followers_url
    f = ua.get(followers_url)
    followers + (f/'//div[@class="person-actions"]/button/../..//a[@class="url uid"]').map{|url| url['href']}
  end

  YAML.dump(Time.now, File.open('timestamp.yaml', 'w'))
  YAML.dump(followers, File.open('followers.yaml', 'w'))
end