import mercurial.util

def dumbdecode(s, cmd):

    return s.replace('\n', '\r\n')

def dumbencode(s, cmd):

    return s.replace('\r\n', '\n')

def clevertest(s, cmd):

    if '\0' in s: return False

    return True

def cleverdecode(s, cmd):

    if clevertest(s, cmd):

        return dumbdecode(s, cmd)

    return s

def cleverencode(s, cmd):

    if clevertest(s, cmd):

        return dumbencode(s, cmd)

    return s

mercurial.util.filtertable.update({

    'dumbdecode:': dumbdecode,

    'dumbencode:': dumbencode,

    'cleverdecode:': cleverdecode,

    'cleverencode:': cleverencode,

    })