class Gem::Commands::CheckCommand

def execute
  say "Checking gems..."
  say
  gems = get_all_gem_names rescue []
  Gem::Validator.new.alien(gems).sort.each do |key, val|
    unless val.empty? then
      say "#{key} has #{val.size} problems"
      val.each do |error_entry|
        say "  #{error_entry.path}:"
        say "    #{error_entry.problem}"
      end
    else
      say "#{key} is error-free" if Gem.configuration.verbose
    end
    say
  end
end

def initialize
  super 'check', 'Check installed gems',
        :alien => true
  add_option('-a', '--alien', "Report 'unmanaged' or rogue files in the",
             "gem repository") do |value, options|
    options[:alien] = true
  end
  add_version_option 'check'
end