class Rails::PluginBuilder

def gemfile_entry
  return unless inside_application?
  gemfile_in_app_path = File.join(rails_app_path, "Gemfile")
  if File.exist? gemfile_in_app_path
    entry = %{\ngem "#{name}", path: "#{relative_path}"}
    append_file gemfile_in_app_path, entry
  end
end