update

# File lib/bundler/vendor/thor/lib/thor/runner.rb, line 132
  def update(name)
    raise Error, "Can't find module '#{name}'" if !thor_yaml[name] || !thor_yaml[name][:location]

    say "Updating '#{name}' from #{thor_yaml[name][:location]}"

    old_filename = thor_yaml[name][:filename]
    self.options = options.merge("as" => name)

    if File.directory? File.expand_path(name)
      require "fileutils"
      FileUtils.rm_rf(File.join(thor_root, old_filename))

      thor_yaml.delete(old_filename)
      save_yaml(thor_yaml)

      filename = install(name)
    else
      filename = install(thor_yaml[name][:location])
    end

    File.delete(File.join(thor_root, old_filename)) unless filename == old_filename
  end