Add folders and file types to rake stats.

gistfile1.rb

namespace :app do
  require 'rails/code_statistics'
  APP_STATS_DIRECTORIES = STATS_DIRECTORIES + [
    ['Javascripts', 'app/assets/javascripts', /.*\.(js|coffee)$/],
    ['Stylesheets', 'app/assets/stylesheets', /.*\.(css|scss|erb)$/],
  ].collect { |name, dir, pattern| [ name, "#{Rails.root}/#{dir}", pattern ] }.select { |name, dir| File.directory?(dir) }

  class AppCodeStatistics < CodeStatistics
    def initialize(*pairs)
      @pairs      = pairs
      @statistics = calculate_statistics
      @total      = calculate_total if pairs.length > 1
    end

    def calculate_statistics
      stats = @pairs.map do |name, dir, pattern| 
        if pattern
          row = calculate_directory_statistics(dir, pattern)
        else
          row = calculate_directory_statistics(dir)
        end

        [name, row]
      end

      Hash[stats]
    end
  end

  desc "Report code statistics (KLOCs, etc) from the application"
  task :stats do
    AppCodeStatistics.new(*APP_STATS_DIRECTORIES).to_s
  end
end