Add an extension loader.

handroll/extensions/__init__.py

@@ -0,0 +1 @@
+# Copyright (c) 2015, Matt Layman

handroll/extensions/base.py

@@ -0,0 +1,5 @@
+# Copyright (c) 2015, Matt Layman
+
+
+class Extension(object):
+    """A base extension which hooks handler methods to handroll's signals."""

handroll/extensions/blog.py

@@ -0,0 +1,7 @@
+# Copyright (c) 2015, Matt Layman
+
+from handroll.extensions.base import Extension
+
+
+class BlogExtension(Extension):
+    """Track files marked as blog entries and generate a feed."""

handroll/extensions/loader.py

@@ -0,0 +1,16 @@
+# Copyright (c) 2015, Matt Layman
+
+from pkg_resources import iter_entry_points
+
+
+class ExtensionLoader(object):
+    """A loader for extensions from handroll's extension entry point."""
+
+    def __init__(self):
+        self._available_extensions = {}
+
+    def load(self):
+        """Load all available extensions from ``handroll.extensions``."""
+        for entry_point in iter_entry_points('handroll.extensions'):
+            cls = entry_point.load()
+            self._available_extensions[entry_point.name] = cls

handroll/tests/test_extensions.py

@@ -0,0 +1,13 @@
+# Copyright (c) 2015, Matt Layman
+
+from handroll.extensions.blog import BlogExtension
+from handroll.extensions.loader import ExtensionLoader
+from handroll.tests import TestCase
+
+
+class TestExtensionLoader(TestCase):
+
+    def test_loads_available_extensions(self):
+        loader = ExtensionLoader()
+        loader.load()
+        self.assertEqual(BlogExtension, loader._available_extensions['blog'])

setup.py

@@ -75,6 +75,9 @@ def run(self):
                 '.sass = handroll.composers.sass:SassComposer',
                 '.scss = handroll.composers.sass:SassComposer',
                 '.textile = handroll.composers.txt:TextileComposer',
+            ],
+            'handroll.extensions': [
+                'blog = handroll.extensions.blog:BlogExtension',
             ]
         },
         include_package_data=True,