class Thor::Runner

def list(search="")
  initialize_thorfiles
  search = ".*#{search}" if options["substring"]
  search = /^#{search}.*/i
  group  = options[:group] || "standard"
  klasses = Thor::Base.subclasses.select do |k|
    (options[:all] || k.group == group) && k.namespace =~ search
  end
  display_klasses(false, klasses)
end