How to use the offlineimap.imaputil.imapsplit function in offlineimap

if result != 'OK':
                raise OfflineImapError("Could not list the folders for"
                        " repository %s. Server responded: %s"%
                        (self.name, self, str(listresult)),
                    OfflineImapError.ERROR.FOLDER)
        finally:
            self.imapserver.releaseconnection(imapobj)

        for s in listresult:
            if s == None or \
                   (isinstance(s, str) and s == ''):
                # Bug in imaplib: empty strings in results from
                # literals. TODO: still relevant?
                continue
            try:
                flags, delim, name = imaputil.imapsplit(s)
            except ValueError:
                self.ui.error(
                    "could not correctly parse server response; got: %s"% s)
                raise
            flaglist = [x.lower() for x in imaputil.flagsplit(flags)]
            if '\\noselect' in flaglist:
                continue
            retval.append(self.getfoldertype()(self.imapserver, name,
                                               self))
        # Add all folderincludes
        if len(self.folderincludes):
            imapobj = self.imapserver.acquireconnection()
            try:
                for foldername in self.folderincludes:
                    try:
                        imapobj.select(imaputil.utf8_IMAP(foldername), readonly=True)

def getfolders(self):
        if self.folders != None:
            return self.folders
        retval = []
        imapobj = self.imapserver.acquireconnection()
        try:
            listresult = imapobj.list(directory = self.imapserver.reference)[1]
        finally:
            self.imapserver.releaseconnection(imapobj)
        for string in listresult:
            if string == None or \
                   (type(string) == types.StringType and string == ''):
                # Bug in imaplib: empty strings in results from
                # literals.
                continue
            flags, delim, name = imaputil.imapsplit(string)
            flaglist = [x.lower() for x in imaputil.flagsplit(flags)]
            if '\\noselect' in flaglist:
                continue
            foldername = imaputil.dequote(name)
            if not self.folderfilter(foldername):
                continue
            retval.append(self.getfoldertype()(self.imapserver, foldername,
                                               self.nametrans(foldername),
                                               self.accountname, self))
        if len(self.folderincludes):
            imapobj = self.imapserver.acquireconnection()
            try:
                for foldername in self.folderincludes:
                    try:
                        imapobj.select(foldername, readonly = 1)
                    except ValueError: