filters.rake

namespace :filters do
  desc 'List all filter permissions'
  task :list => :environment do
    controllers = Dir[Rails.root.to_s+'/app/controllers/**/*_controller.rb'].map{ |f| File.basename(f).gsub(/\.rb$/, '').classify }.sort
    controllers.each do |controller|
      filters = controller.constantize.filter_chain
      puts controller
      filters.each do |filter|
        puts "\t#{filter.method}"
        puts "\t\t" << filter.options.inspect unless filter.options.blank?
      end
      puts
    end
  end
end

output.txt

ApplicationController
	login_required
	app_user_required

ClientsController
	login_required
	app_user_required
	app_admin_required
		{:only=>#<Set: {"edit", "update", "new", "create"}>}
	super_admin_required
		{:only=>#<Set: {"destroy"}>}

...