class Thor::Runner

def update(name)
  yaml = thor_yaml
  raise Error, "Can't find module `#{name}'" if !yaml[name] || !yaml[name][:location]
  puts "Updating `#{name}' from #{yaml[name][:location]}"
  old_filename = yaml[name][:filename]
  self.options = self.options.merge("as" => name)
  filename = install(yaml[name][:location])
  unless filename == old_filename
    File.delete(File.join(thor_root, old_filename))
  end
end