class Rails::Generators::AuthenticationGenerator

def enable_bcrypt
  if File.read("Gemfile").include?('gem "bcrypt"')
    uncomment_lines "Gemfile", /gem "bcrypt"/
    Bundler.with_original_env { execute_command :bundle, "install --quiet" }
  else
    Bundler.with_original_env { execute_command :bundle, "add bcrypt", capture: true }
  end
end