class Chef::Knife::RoleShow

def run
  @role_name = @name_args[0]
  if @role_name.nil?
    show_usage
    ui.fatal("You must specify a role name.")
    exit 1
  end
  role = Chef::Role.load(@role_name)
  output(format_for_display(config[:environment] ? role.environment(config[:environment]) : role))
end