install_rdoc

# File lib/rubygems/commands/setup_command.rb, line 224
  def install_rdoc
    gem_doc_dir = File.join Gem.dir, 'doc'
    rubygems_name = "rubygems-#{Gem::VERSION}"
    rubygems_doc_dir = File.join gem_doc_dir, rubygems_name

    if File.writable? gem_doc_dir and
       (not File.exist? rubygems_doc_dir or
        File.writable? rubygems_doc_dir) then
      say "Removing old RubyGems RDoc and ri" if @verbose
      Dir[File.join(Gem.dir, 'doc', 'rubygems-[0-9]*')].each do |dir|
        rm_rf dir
      end

      if options[:ri] then
        ri_dir = File.join rubygems_doc_dir, 'ri'
        say "Installing #{rubygems_name} ri into #{ri_dir}" if @verbose
        run_rdoc '--ri', '--op', ri_dir
      end

      if options[:rdoc] then
        rdoc_dir = File.join rubygems_doc_dir, 'rdoc'
        say "Installing #{rubygems_name} rdoc into #{rdoc_dir}" if @verbose
        run_rdoc '--op', rdoc_dir
      end
    elsif @verbose then
      say "Skipping RDoc generation, #{gem_doc_dir} not writable"
      say "Set the GEM_HOME environment variable if you want RDoc generated"
    end
  end