application.rb

config.assets.precompile << Proc.new do |path|
      full_path       = Rails.application.assets.resolve(path).to_path
      app_assets_path = Rails.root.join('app', 'assets').to_path
      if full_path.starts_with? app_assets_path
        if full_path =~ /\.(css|js)\./ 
          puts "\e[0;32m✓ #{full_path}\e[0m"
          true
        else
          puts "\e[1;30m✗ #{full_path}\e[0m"
          false
        end
      end
    end