class Gem::Commands::RdocCommand

def execute
  specs = if options[:all] then
            Gem::Specification.to_a
          else
            get_all_gem_names.map do |name|
              Gem::Specification.find_by_name name, options[:version]
            end.flatten.uniq
          end
  if specs.empty? then
    alert_error 'No matching gems found'
    terminate_interaction 1
  end
  specs.each do |spec|
    doc = Gem::RDoc.new spec, options[:include_rdoc], options[:include_ri]
    doc.force = options[:overwrite]
    if options[:overwrite] then
      FileUtils.rm_rf File.join(spec.doc_dir, 'ri')
      FileUtils.rm_rf File.join(spec.doc_dir, 'rdoc')
    end
    begin
      doc.generate
    rescue Errno::ENOENT => e
      e.message =~ / - /
      alert_error "Unable to document #{spec.full_name}, #{$'} is missing, skipping"
      terminate_interaction 1 if specs.length == 1
    end
  end
end