class Thor::Runner

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 = self.options.merge("as" => name)
  filename     = install(thor_yaml[name][:location])
  unless filename == old_filename
    File.delete(File.join(thor_root, old_filename))
  end
end