comparison hglib/util.py @ 77:4282391dd693

util: add propertycache decorator

76:37307caccf54

    def __nonzero__(self):
        """ Returns True if the return code was 0, False otherwise """
        return self.ret == 0

close_fds = os.name == 'posix'

startupinfo = None
if os.name == 'nt':
    startupinfo = subprocess.STARTUPINFO()

77:4282391dd693

    def __nonzero__(self):
        """ Returns True if the return code was 0, False otherwise """
        return self.ret == 0

class propertycache(object):
    """
    Decorator that remembers the return value of a function call.

    >>> class obj(object):
    ...     def func(self):
    ...         print 'func'
    ...         return []
    ...     func = propertycache(func)
    >>> o = obj()
    >>> o.func
    func
    []
    >>> o.func
    []
    """
    def __init__(self, func):
        self.func = func
        self.name = func.__name__
    def __get__(self, obj, type=None):
        result = self.func(obj)
        setattr(obj, self.name, result)
        return result

close_fds = os.name == 'posix'

startupinfo = None
if os.name == 'nt':
    startupinfo = subprocess.STARTUPINFO()