class Gem::Commands::GenerateIndexCommand

def initialize
  super 'generate_index',
        'Generates the index files for a gem server directory',
        :directory => '.', :build_modern => true
  add_option '-d', '--directory=DIRNAME',
             'repository base dir containing gems subdir' do |dir, options|
    options[:directory] = File.expand_path dir
  end
  add_option '--[no-]modern',
             'Generate indexes for RubyGems',
             '(always true)' do |value, options|
    options[:build_modern] = value
  end
  add_option '--update',
             'Update modern indexes with gems added',
             'since the last update' do |value, options|
    options[:update] = value
  end
end