Deprecate AutoDirective._special_attrgetters

CHANGES

@@ -22,7 +22,9 @@ Deprecated
 * ``format_annotation()`` and ``formatargspec()`` is deprecated.  Please use
   ``sphinx.util.inspect.Signature`` instead.
 * ``sphinx.ext.autodoc.add_documenter()`` and ``AutoDirective._register`` is now
-  deprecated.  Please use ``app.add_autodocumenter()``
+  deprecated.  Please use ``app.add_autodocumenter()`` instead.
+* ``AutoDirective._special_attrgetters`` is now deprecated.  Please use
+  ``app.add_autodoc_attrgetter()`` instead.
 
 Features added
 --------------

sphinx/application.py

@@ -646,11 +646,10 @@ class Sphinx(object):
         self.add_directive('auto' + cls.objtype, AutoDirective)
         self.registry.add_documenter(cls.objtype, cls)
 
-    def add_autodoc_attrgetter(self, type, getter):
-        # type: (Any, Callable) -> None
-        logger.debug('[app] adding autodoc attrgetter: %r', (type, getter))
-        from sphinx.ext import autodoc
-        autodoc.AutoDirective._special_attrgetters[type] = getter
+    def add_autodoc_attrgetter(self, typ, getter):
+        # type: (Type, Callable[[Any, unicode, Any], Any]) -> None
+        logger.debug('[app] adding autodoc attrgetter: %r', (typ, getter))
+        self.registy.add_autodoc_attrgetter(typ, getter)
 
     def add_search_language(self, cls):
         # type: (Any) -> None

sphinx/ext/autodoc/__init__.py

@@ -285,14 +285,10 @@ class Documenter(object):
 
     option_spec = {'noindex': bool_option}  # type: Dict[unicode, Callable]
 
-    @staticmethod
-    def get_attr(obj, name, *defargs):
+    def get_attr(self, obj, name, *defargs):
         # type: (Any, unicode, Any) -> Any
         """getattr() override for types such as Zope interfaces."""
-        for typ, func in iteritems(AutoDirective._special_attrgetters):
-            if isinstance(obj, typ):
-                return func(obj, name, *defargs)
-        return safe_getattr(obj, name, *defargs)
+        return autodoc_attrgetter(self.env.app, obj, name, *defargs)
 
     @classmethod
     def can_document_member(cls, member, membername, isattr, parent):
@@ -1496,10 +1492,6 @@ class AutoDirective(Directive):
     The AutoDirective class is used for all autodoc directives.  It dispatches
     most of the work to one of the Documenters.
 
-    The *_special_attrgetters* attribute is used to customize ``getattr()``
-    calls that the Documenters make; its entries are of the form ``type:
-    getattr_function``.
-
     Note: When importing an object, all items along the import chain are
     accessed using the descendant's *_special_attrgetters*, thus this
     dictionary should include all necessary functions for accessing
@@ -1512,7 +1504,10 @@ class AutoDirective(Directive):
     )  # type: Dict[unicode, Type[Documenter]]
 
     # a registry of type -> getattr function
-    _special_attrgetters = {}  # type: Dict[Type, Callable]
+    _special_attrgetters = DeprecatedDict(
+        'AutoDirective._special_attrgetters has been deprecated. '
+        'Please use app.add_autodoc_attrgetter() instead.'
+    )  # type: Dict[Type, Callable]
 
     # flags that can be given in autodoc_default_flags
     _default_flags = set([
@@ -1628,6 +1623,20 @@ def get_documenters(app):
     return classes
 
 
+def autodoc_attrgetter(app, obj, name, *defargs):
+    # type: (Sphinx, Any, unicode, Any) -> Any
+    """Alternative getattr() for types"""
+    candidates = dict(AutoDirective._special_attrgetters)
+    if app:
+        candidates.update(app.registry.autodoc_attrgettrs)
+
+    for typ, func in iteritems(candidates):
+        if isinstance(obj, typ):
+            return func(obj, name, *defargs)
+
+    return safe_getattr(obj, name, *defargs)
+
+
 def setup(app):
     # type: (Sphinx) -> Dict[unicode, Any]
     app.add_autodocumenter(ModuleDocumenter)

sphinx/registry.py

@@ -52,6 +52,7 @@ EXTENSION_BLACKLIST = {
 
 class SphinxComponentRegistry(object):
     def __init__(self):
+        self.autodoc_attrgettrs = {}    # type: Dict[Type, Callable[[Any, unicode, Any], Any]]
         self.builders = {}              # type: Dict[unicode, Type[Builder]]
         self.documenters = {}           # type: Dict[unicode, Type[Documenter]]
         self.domains = {}               # type: Dict[unicode, Type[Domain]]
@@ -290,6 +291,10 @@ class SphinxComponentRegistry(object):
         # type: (unicode, Type[Documenter]) -> None
         self.documenters[objtype] = documenter
 
+    def add_autodoc_attrgetter(self, typ, attrgetter):
+        # type: (Type, Callable[[Any, unicode, Any], Any]) -> None
+        self.autodoc_attrgettrs[typ] = attrgetter
+
     def load_extension(self, app, extname):
         # type: (Sphinx, unicode) -> None
         """Load a Sphinx extension."""