Add support for decorative partial functions

src/decorator.py

@@ -37,6 +37,7 @@
 import inspect
 import operator
 import itertools
+import functools
 from contextlib import _GeneratorContextManager
 from inspect import getfullargspec, iscoroutinefunction, isgeneratorfunction
 
@@ -71,7 +72,7 @@ def __init__(self, func=None, name=None, signature=None,
                 self.name = '_lambda_'
             self.doc = func.__doc__
             self.module = func.__module__
-            if inspect.isroutine(func):
+            if inspect.isroutine(func) or isinstance(func, functools.partial):
                 argspec = getfullargspec(func)
                 self.annotations = getattr(func, '__annotations__', {})
                 for a in ('args', 'varargs', 'varkw', 'defaults', 'kwonlyargs',
@@ -214,6 +215,8 @@ def decorate(func, caller, extras=(), kwsyntax=False):
     does. By default kwsyntax is False and the the arguments are untouched.
     """
     sig = inspect.signature(func)
+    if isinstance(func, functools.partial):
+        func = functools.update_wrapper(func,func.func)
     if iscoroutinefunction(caller):
         async def fun(*args, **kw):
             if not kwsyntax:
@@ -230,6 +233,7 @@ def fun(*args, **kw):
             if not kwsyntax:
                 args, kw = fix(args, kw, sig)
             return caller(func, *(extras + args), **kw)
+
     fun.__name__ = func.__name__
     fun.__doc__ = func.__doc__
     fun.__wrapped__ = func
@@ -278,6 +282,7 @@ def decorator(caller, _func=None, kwsyntax=False):
     """
     decorator(caller) converts a caller function into a decorator
     """
+
     if _func is not None:  # return a decorated function
         # this is obsolete behavior; you should use decorate instead
         return decorate(_func, caller, (), kwsyntax)

src/tests/test.py

@@ -3,6 +3,7 @@
 import unittest
 import decimal
 import inspect
+import functools
 from asyncio import get_event_loop
 from collections import defaultdict, ChainMap, abc as c
 from decorator import dispatch_on, contextmanager, decorator
@@ -509,5 +510,17 @@ def __len__(self):
             h(u)
 
 
+@decorator
+def partial_before_after(func, *args, **kwargs):
+    return "<before>" +  func(*args, **kwargs) + "<after>"
+
+class PartialTestCase(unittest.TestCase):
+    def test_before_after(self):
+        def origin_func(x,y):
+            return x+y
+        partial_func = partial_before_after(functools.partial(origin_func,"x"))
+        out = partial_func("y")
+        self.assertEqual(out, '<before>xy<after>')
+
 if __name__ == '__main__':
     unittest.main()