[libpeas] Support Python plugins that define __all__

[Garrett Regier <gregier src gnome org>]

commit 557abb55ee4429ebe6f48aed5a67950c0374b043
Author: Garrett Regier <garrettregier gmail com>
Date:   Tue Jan 20 17:25:15 2015 -0800

    Support Python plugins that define __all__
    
    Instead of going through every local in the
    plugin just check those in __all__, if defined.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=741802

 loaders/python/peas-python-internal.py             |    8 +++++++-
 .../plugins/extension-python/extension-py.py.in    |    3 +++
 2 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/loaders/python/peas-python-internal.py b/loaders/python/peas-python-internal.py
index d14b4d8..f05b840 100644
--- a/loaders/python/peas-python-internal.py
+++ b/loaders/python/peas-python-internal.py
@@ -131,7 +131,13 @@ class Hooks(object):
         except KeyError:
             pass
 
-        for key in module.__dict__:
+        try:
+            keys = module.__all__
+
+        except AttributeError:
+            keys = module.__dict__
+
+        for key in keys:
             value = getattr(module, key)
 
             try:
diff --git a/tests/libpeas/plugins/extension-python/extension-py.py.in 
b/tests/libpeas/plugins/extension-python/extension-py.py.in
index 063ac56..5a10e82 100644
--- a/tests/libpeas/plugins/extension-python/extension-py.py.in
+++ b/tests/libpeas/plugins/extension-python/extension-py.py.in
@@ -6,6 +6,9 @@ import threading
 from gi.repository import GObject, Introspection, Peas
 
 
+__all__ = [ 'ExtensionPythonPlugin' ]
+
+
 class ExtensionPythonPlugin(GObject.Object, Peas.Activatable,
                             Introspection.Base, Introspection.Callable,
                             Introspection.HasPrerequisite):