module Rails::Generators::Actions

def gem_group(*names, &block)
  options = names.extract_options!
  str = names.map(&:inspect)
  str << quote(options) unless options.empty?
  str = str.join(", ")
  log :gemfile, "group #{str}"
  in_root do
    append_file_with_newline "Gemfile", "\ngroup #{str} do", force: true
    with_indentation(&block)
    append_file_with_newline "Gemfile", "end", force: true
  end
end