Simple Rake task for Rails3 to install/update to the latest version of jQuery and the rails.js UJS driver

jquery.rake

namespace :jquery do
  desc "Installs the latest version of jQuery and the rails.js UJS jQuery Adapter"
  task :install => :update do
    puts "Installed jQuery and the rails.js UJS jQuery Adapter"
    puts %Q{
******************************************************************************

  You can update your javascript defaults in Rails3 with the following:

  in application.rb, add:
  
  config.action_view.javascript_expansions[:defaults] = %w(jquery.min rails)
  
******************************************************************************
    }
  end
  
  desc "Updates to the latest version of jQuery and the rails.js UJS jQuery Adapter"
  task :update do
    version   = ENV['JQUERY_VERSION'] || nil
    jquery    = open("http://code.jquery.com/jquery#{version ? "-#{version}" : ""}.min.js")
    ujs       = open('https://github.com/rails/jquery-ujs/raw/master/src/rails.js')
    
    puts "\n"
    puts "Updating jQuery..."
    File.open(File.join(Rails.root, 'public/javascripts/jquery.min.js'), 'w+') do |f|
      f << jquery.read
    end
    
    puts "Updating jQuery UJS (from Github HEAD)..."
    File.open(File.join(Rails.root, 'public/javascripts/rails.js'), 'w+') do |f|
      f << ujs.read
    end
    puts "\n"
  end
end