class Gem::Commands::SetupCommand

def initialize
  require 'tmpdir'
  super 'setup', 'Install RubyGems',
        :format_executable => true, :document => %w[ri],
        :site_or_vendor => :sitelibdir,
        :destdir => '', :prefix => '', :previous_version => ''
  add_option '--previous-version=VERSION',
             'Previous version of rubygems',
             'Used for changelog processing' do |version, options|
    options[:previous_version] = version
  end
  add_option '--prefix=PREFIX',
             'Prefix path for installing RubyGems',
             'Will not affect gem repository location' do |prefix, options|
    options[:prefix] = File.expand_path prefix
  end
  add_option '--destdir=DESTDIR',
             'Root directory to install RubyGems into',
             'Mainly used for packaging RubyGems' do |destdir, options|
    options[:destdir] = File.expand_path destdir
  end
  add_option '--[no-]vendor',
             'Install into vendorlibdir not sitelibdir' do |vendor, options|
    options[:site_or_vendor] = vendor ? :vendorlibdir : :sitelibdir
  end
  add_option '--[no-]format-executable',
             'Makes `gem` match ruby',
             'If ruby is ruby18, gem will be gem18' do |value, options|
    options[:format_executable] = value
  end
  add_option '--[no-]document [TYPES]', Array,
             'Generate documentation for RubyGems.',
             'List the documentation types you wish to',
             'generate.  For example: rdoc,ri' do |value, options|
    options[:document] = case value
                         when nil   then %w[rdoc ri]
                         when false then []
                         else            value
                         end
  end
  add_option '--[no-]rdoc',
             'Generate RDoc documentation for RubyGems' do |value, options|
    if value then
      options[:document] << 'rdoc'
    else
      options[:document].delete 'rdoc'
    end
    options[:document].uniq!
  end
  add_option '--[no-]ri',
             'Generate RI documentation for RubyGems' do |value, options|
    if value then
      options[:document] << 'ri'
    else
      options[:document].delete 'ri'
    end
    options[:document].uniq!
  end
end