better list display

        '''List objects'''

        if len(argv) == 1:

            argv.append("a")

        items = self.cli.rpc.list(str.join("", argv[1:]))

        for item in items:

            pprint.pprint(item)

            #for key, val in item.items():

            #    self.printer.out("%s: %s "%(key, val))

        try:

            objs = self.cli.rpc.list(str.join("", argv[1:]))

        except RpcError as e:

            raise cmdError("RPCError: %s"%str(e))

        # get all tag list

        tags = dict()

        for o in objs:

            for t,v in o.items():

                tags[t] = max(len(str(v)), tags.get(t, len(str(t))))

        # extract id info

        idsize = tags.pop("id")

        # print titles

        self.printer.out("%s%s%s"%(color["yellow"], "id".ljust(idsize+1), color["reset"]), nl=" ")

        for t,v in tags.items():

            self.printer.out(t.ljust(v), nl=" ")

        self.printer.out()

        # print obj

        for obj in objs:

            self.printer.out("%s%s%s"%(color["yellow"], obj.pop("id").ljust(idsize+1), color["reset"]) ,nl=" ")

            for (t, v) in tags.items():

                self.printer.out(str(obj.get(t, "")).ljust(v) ,nl=" ")

            self.printer.out()

    cmd_list.usage = "list [tql]"

    def _startstopsdestroypauseresume(self, argv):

        self.history.load(self.historyfile)

        self.history.maxsize(self.historysize)

    def out(self, message, fd=sys.stdout, nl=os.linesep, flush=True):

    def out(self, message="", fd=sys.stdout, nl=os.linesep, flush=True):

        '''Print a message in fd ended by nl'''

        fd.write("%s%s"%(message, nl))

        if flush: