execute

# File lib/rubygems/commands/generate_index_command.rb, line 65
  def execute
    # This is always true because it's the only way now.
    options[:build_modern] = true

    if not File.exist?(options[:directory]) or
       not File.directory?(options[:directory]) then
      alert_error "unknown directory name #{options[:directory]}."
      terminate_interaction 1
    else
      indexer = Gem::Indexer.new options.delete(:directory), options

      if options[:update] then
        indexer.update_index
      else
        indexer.generate_index
      end
    end
  end