From 4f06f6ef41d90ebb4e9b2aa1caa874cb3885261e Mon Sep 17 00:00:00 2001
From: Pablo Hoffman <pablo@pablohoffman.com>
Date: Mon, 17 Aug 2009 18:13:45 -0300
Subject: [PATCH] applied fix to deprecated decorator to warn only once (thanks
 Dan)

---
 scrapy/utils/decorator.py | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/scrapy/utils/decorator.py b/scrapy/utils/decorator.py
index 74f393377..e49ea1c73 100644
--- a/scrapy/utils/decorator.py
+++ b/scrapy/utils/decorator.py
@@ -1,4 +1,5 @@
 import warnings
+from functools import wraps
 
 
 def deprecated(use_instead=None):
@@ -6,19 +7,20 @@ def deprecated(use_instead=None):
     as deprecated. It will result in a warning being emitted
     when the function is used."""
 
-    def wraps(func):
+    def wrapped(func):
+        @wraps(func)
         def new_func(*args, **kwargs):
             message = "Call to deprecated function %s." % func.__name__
             if use_instead:
                 message += " Use %s instead." % use_instead
 
-            warnings.warn_explicit(
-                message,
+            warnings.warn_explicit(message,
                 category=DeprecationWarning,
                 filename=func.func_code.co_filename,
-                lineno=func.func_code.co_firstlineno + 1
-            )
+                lineno=func.func_code.co_firstlineno + 1,
+                registry=func.func_globals.setdefault('__warningregistry__', \
+                                                      {}),
+                module_globals=func.func_globals)
             return func(*args, **kwargs)
         return new_func
-    return wraps
-
+    return wrapped