Add fspath support. Ref ionelmc#38.

Author: ionelmc

src/lazy_object_proxy/cext.c

@@ -1282,6 +1282,7 @@ static PyMethodDef Proxy_methods[] = {
     { "__reversed__", (PyCFunction)Proxy_reversed, METH_NOARGS, 0 },
     { "__reduce__", (PyCFunction)Proxy_reduce, METH_NOARGS, 0 },
     { "__reduce_ex__", (PyCFunction)Proxy_reduce, METH_O, 0 },
+    { "__fspath__", (PyCFunction)Proxy_str, METH_NOARGS, 0 },
 #if PY_MAJOR_VERSION >= 3
     { "__round__",  (PyCFunction)Proxy_round, METH_NOARGS, 0 },
 #endif

src/lazy_object_proxy/simple.py

@@ -100,6 +100,7 @@ def __repr__(self, __getattr__=object.__getattribute__):
                 self.__factory__
             )
 
+    __fspath__ = make_proxy_method(str)
     __reversed__ = make_proxy_method(reversed)
 
     if PY3:

src/lazy_object_proxy/slots.py

@@ -152,6 +152,9 @@ def __repr__(self, __getattr__=object.__getattribute__):
                 self.__factory__
             )
 
+    def __fspath__(self):
+        return str(self.__wrapped__)
+
     def __reversed__(self):
         return reversed(self.__wrapped__)
 

tests/test_lazy_object_proxy.py

@@ -2,6 +2,7 @@
 
 import gc
 import imp
+import os
 import pickle
 import platform
 import sys
@@ -1943,3 +1944,8 @@ def __init__(self, func, **lazy_attr):
     proxy = LazyProxy(lambda: called.append(1) or Foo(), name='bar')
     assert proxy.name == 'bar'
     assert not called
+
+
+@pytest.mark.skipif(not hasattr(os, "fspath"), reason="No os.fspath support.")
+def test_fspath(lazy_object_proxy):
+    assert os.fspath(lazy_object_proxy.Proxy(lambda: '/tmp')) == '/tmp'