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pre_commit/util.py

@@ -0,0 +1,16 @@
+
+class cached_property(object):
+    """Like @property, but caches the value."""
+
+    def __init__(self, func):
+        self.__name__ = func.__name__
+        self.__module__ = func.__module__
+        self.__doc__ = func.__doc__
+        self._func = func
+
+    def __get__(self, obj, cls):
+        if obj is None:
+            return self
+        value = self._func(obj)
+        obj.__dict__[self.__name__] = value
+        return value