class Gem::Commands::SetupCommand

def execute
  @verbose = Gem.configuration.really_verbose
  install_destdir = options[:destdir]
  unless install_destdir.empty? then
    ENV['GEM_HOME'] ||= File.join(install_destdir,
                                  Gem.default_dir.gsub(/^[a-zA-Z]:/, ''))
  end
  check_ruby_version
  require 'fileutils'
  if Gem.configuration.really_verbose then
    extend FileUtils::Verbose
  else
    extend FileUtils
  end
  lib_dir, bin_dir = make_destination_dirs install_destdir
  install_lib lib_dir
  install_executables bin_dir
  remove_old_bin_files bin_dir
  remove_old_lib_files lib_dir
  say "RubyGems #{Gem::VERSION} installed"
  uninstall_old_gemcutter
  documentation_success = install_rdoc
  say
  if @verbose then
    say "-" * 78
    say
  end
  if options[:previous_version].empty?
    options[:previous_version] = Gem::VERSION.sub(/[0-9]+$/, '0')
  end
  options[:previous_version] = Gem::Version.new(options[:previous_version])
  show_release_notes
  say
  say "-" * 78
  say
  say "RubyGems installed the following executables:"
  say @bin_file_names.map { |name| "\t#{name}\n" }
  say
  unless @bin_file_names.grep(/#{File::SEPARATOR}gem$/) then
    say "If `gem` was installed by a previous RubyGems installation, you may need"
    say "to remove it by hand."
    say
  end
  if documentation_success
    if options[:document].include? 'rdoc' then
      say "Rdoc documentation was installed. You may now invoke:"
      say "  gem server"
      say "and then peruse beautifully formatted documentation for your gems"
      say "with your web browser."
      say "If you do not wish to install this documentation in the future, use the"
      say "--no-document flag, or set it as the default in your ~/.gemrc file. See"
      say "'gem help env' for details."
      say
    end
    if options[:document].include? 'ri' then
      say "Ruby Interactive (ri) documentation was installed. ri is kind of like man "
      say "pages for ruby libraries. You may access it like this:"
      say "  ri Classname"
      say "  ri Classname.class_method"
      say "  ri Classname#instance_method"
      say "If you do not wish to install this documentation in the future, use the"
      say "--no-document flag, or set it as the default in your ~/.gemrc file. See"
      say "'gem help env' for details."
      say
    end
  end
end