# File lib/rhc/commands/cartridge.rb, line 82
    def add(cart_type)
      cart = check_cartridges(cart_type, :from => not_standalone_cartridges).first

      say "Adding #{cart.short_name} to application '#{options.app}' ... "

      say format_usage_message(cart) if cart.usage_rate?

      rest_app = find_app(:include => :cartridges)

      supports_env_vars = rest_app.supports_add_cartridge_with_env_vars?
      supports_gear_size = rest_app.supports_add_cartridge_with_gear_size?

      cart.environment_variables = collect_env_vars(options.env).map { |item| item.to_hash } if options.env && supports_env_vars
      cart.gear_size = options.gear_size if options.gear_size && supports_gear_size

      rest_cartridge = rest_app.add_cartridge(cart)

      success "done"

      rest_cartridge.environment_variables = cart.environment_variables if cart.environment_variables.present?

      paragraph{ display_cart(rest_cartridge) }
      paragraph{ say "Use 'rhc env --help' to manage environment variable(s) on this cartridge and application." } if cart.environment_variables.present?
      paragraph{ warn "Server does not support environment variables." if options.env && !supports_env_vars  }
      paragraph{ warn "Server does not support gear sizes for cartridges." if options.gear_size && !supports_gear_size  }
      paragraph{ rest_cartridge.messages.each { |msg| success msg } }

      0
    end