--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/pyams_viewlet/metaconfigure.py	Wed Dec 05 13:23:08 2018 +0100
@@ -0,0 +1,100 @@
+#
+# Copyright (c) 2008-2015 Thierry Florac <tflorac AT ulthar.net>
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+
+__docformat__ = 'restructuredtext'
+
+
+# import standard library
+
+# import interfaces
+from pyams_viewlet.interfaces import IViewletManager, IViewlet
+from pyramid.interfaces import IRequest, IView
+
+# import packages
+from pyams_viewlet.manager import ViewletManager, ViewletManagerFactory
+from pyramid.exceptions import ConfigurationError
+from zope.component import zcml
+from zope.component.interface import provideInterface
+from zope.interface import Interface, classImplements
+
+
+def ViewletManagerDirective(_context, name,
+                            context=Interface,
+                            layer=IRequest,
+                            view=IView,
+                            provides=IViewletManager,
+                            class_=None,
+                            permission=None):
+
+    # If class is not given we use the basic viewlet manager.
+    if class_ is None:
+        class_ = ViewletManager
+
+    # Create a new class based on the class.
+    cdict = {'permission': permission}
+    new_class = ViewletManagerFactory(name, provides, bases=(class_,), cdict=cdict)
+
+    # Register interfaces
+    _handle_for(_context, context)
+    zcml.interface(_context, view)
+
+    # Create a checker for the viewlet manager
+    # checker.defineChecker(new_class, checker.Checker(required))
+
+    # register a viewlet manager
+    _context.action(discriminator=('viewletManager', context, layer, view, name),
+                    callable=zcml.handler,
+                    args=('registerAdapter', new_class,
+                          (context, layer, view),
+                          provides, name, _context.info))
+
+
+def ViewletDirective(_context, name, class_,
+                     context=Interface,
+                     layer=IRequest,
+                     view=IView,
+                     manager=IViewletManager,
+                     attribute='render',
+                     permission=None,
+                     **kwargs):
+
+    # Make sure the has the right form, if specified.
+    if attribute != 'render':
+        if not hasattr(class_, attribute):
+            raise ConfigurationError("The provided class doesn't have the specified attribute")
+
+    cdict = {}
+    cdict['__name__'] = name
+    cdict['__page_attribute__'] = attribute
+    cdict['permission'] = permission
+    cdict.update(kwargs)
+    new_class = type(class_.__name__, (class_,), cdict)
+
+    classImplements(new_class, IViewlet)
+
+    # Register the interfaces.
+    _handle_for(_context, context)
+    zcml.interface(_context, view)
+
+    # register viewlet
+    _context.action(discriminator=('viewlet', context, layer, view, manager, name),
+                    callable=zcml.handler,
+                    args=('registerAdapter', new_class,
+                          (context, layer, view, manager),
+                          IViewlet, name, _context.info))
+
+
+def _handle_for(_context, for_):
+    if for_ is not None:
+        _context.action(discriminator=None,
+                        callable=provideInterface,
+                        args=('', for_))