namespace :jquery do
  desc "Update jquery libraries to use 'jQuery.' rather than '$.'"
  task :devalue => :environment do
    prototype_js = %w[
      application.js
      controls.js
      dragdrop.js
      effects.js
      prototype.js
    ]
    Dir.glob(RAILS_ROOT + '/public/javascripts/*.js').each do |file|
      unless prototype_js.include?(File.basename(file))
        File.open(file) do |jfile|
          js = jfile.read
          if js["function($)"]
            File.open(file+'.devalued', 'w') {|f| f.write(js) } # Make backup file.js.devalued
            js.gsub!("function($)", "function(jQuery)")
            js.gsub!("$.", "jQuery.")
            js.gsub!("$(", "jQuery(")
            js.gsub!("$[", "jQuery[")
            File.open(file, 'w') {|f| f.write(js) }
            puts "Devalued     #{file}"
            puts "Backed up to #{file}.devalued"
          end
        end
      end
    end
  end
end