From bb462e7f489bee123f1c5bf37cde06c65cefa5d0 Mon Sep 17 00:00:00 2001
From: Chris McDonough <chrism@plope.com>
Date: Mon, 12 Dec 2011 01:28:53 -0500
Subject: first cut at __view_defaults__ feature

---
 pyramid/config/util.py                  |  4 +++-
 pyramid/config/views.py                 | 16 ++++++++++++++++
 pyramid/tests/test_config/test_views.py | 27 +++++++++++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/pyramid/config/util.py b/pyramid/config/util.py
index 3a2f911dc..b0e873de3 100644
--- a/pyramid/config/util.py
+++ b/pyramid/config/util.py
@@ -43,13 +43,15 @@ def action_method(wrapped):
         if self._ainfo is None:
             self._ainfo = []
         info = kw.pop('_info', None)
+        # backframes for outer decorators to actionmethods
+        backframes = kw.pop('_backframes', 2) 
         if is_nonstr_iter(info) and len(info) == 4:
             # _info permitted as extract_stack tuple
             info = ActionInfo(*info)
         if info is None:
             try:
                 f = traceback.extract_stack(limit=3)
-                info = ActionInfo(*f[-2])
+                info = ActionInfo(*f[-backframes])
             except: # pragma: no cover
                 info = ActionInfo(None, 0, '', '')
         self._ainfo.append(info)
diff --git a/pyramid/config/views.py b/pyramid/config/views.py
index a4333b3d6..d8b728bc3 100644
--- a/pyramid/config/views.py
+++ b/pyramid/config/views.py
@@ -1,5 +1,6 @@
 import inspect
 import operator
+from functools import wraps
 
 from zope.interface import (
     Interface,
@@ -551,7 +552,22 @@ class MultiView(object):
                 continue
         raise PredicateMismatch(self.name)
 
+def viewdefaults(wrapped):
+    def wrapper(*arg, **kw):
+        defaults = {}
+        if len(arg) > 1:
+            view = arg[1]
+        else:
+            view = kw.get('view')
+        if inspect.isclass(view):
+            defaults = getattr(view, '__view_defaults__', {})
+        defaults.update(kw)
+        defaults['_backframes'] = 3
+        return wrapped(*arg, **defaults)
+    return wraps(wrapped)(wrapper)
+
 class ViewsConfiguratorMixin(object):
+    @viewdefaults
     @action_method
     def add_view(self, view=None, name="", for_=None, permission=None,
                  request_type=None, route_name=None, request_method=None,
diff --git a/pyramid/tests/test_config/test_views.py b/pyramid/tests/test_config/test_views.py
index a7b0dd574..30a30a1e8 100644
--- a/pyramid/tests/test_config/test_views.py
+++ b/pyramid/tests/test_config/test_views.py
@@ -1376,6 +1376,33 @@ class TestViewsConfigurationMixin(unittest.TestCase):
         self.assertEqual(view(None, None), 'OK')
         self.assertEqual(Mapper.kw['mapper'], Mapper)
 
+    def test_add_view_with_view_defaults(self):
+        from pyramid.renderers import null_renderer
+        from pyramid.exceptions import PredicateMismatch
+        from zope.interface import directlyProvides
+        class view(object):
+            __view_defaults__ = {
+                'containment':'pyramid.tests.test_config.IDummy'
+                }
+            def __init__(self, request):
+                pass
+            def __call__(self):
+                return 'OK'
+        config = self._makeOne(autocommit=True)
+        config.add_view(
+            view=view,
+            renderer=null_renderer)
+        wrapper = self._getViewCallable(config)
+        context = DummyContext()
+        directlyProvides(context, IDummy)
+        request = self._makeRequest(config)
+        self.assertEqual(wrapper(context, request), 'OK')
+
+        context = DummyContext()
+        request = self._makeRequest(config)
+        self.assertRaises(PredicateMismatch, wrapper, context, request)
+        
+
     def test_derive_view_function(self):
         from pyramid.renderers import null_renderer
         def view(request):
-- 
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