Require an open_graph config section for the open graph extension.

handroll/extensions/og.py

@@ -1,6 +1,8 @@
 # Copyright (c) 2017, Matt Layman
 
+from handroll.exceptions import AbortError
 from handroll.extensions.base import Extension
+from handroll.i18n import _
 
 
 class OpenGraphExtension(Extension):
@@ -10,6 +12,10 @@ class OpenGraphExtension(Extension):
     handle_pre_composition = True
 
     def on_pre_composition(self, director):
+        if not self._config.parser.has_section('open_graph'):
+            raise AbortError(_(
+                'An open_graph section is missing in the configuration file.'))
+
         self._resolver = director.resolver
 
     def on_frontmatter_loaded(self, source_file, frontmatter):

handroll/tests/test_open_graph_extension.py

@@ -3,6 +3,7 @@
 import os
 
 from handroll import signals
+from handroll.exceptions import AbortError
 from handroll.extensions.og import OpenGraphExtension
 from handroll.tests import TestCase
 
@@ -16,6 +17,7 @@ def tearDown(self):
         signals.pre_composition.receivers.clear()
 
     def _make_one(self, director):
+        director.config.parser.add_section('open_graph')
         extension = OpenGraphExtension(director.config)
         extension.on_pre_composition(director)
         return extension
@@ -78,3 +80,9 @@ def test_convert_summary_double_to_single_quotes(self):
         self.assertIn(
             '<meta property="og:description" content="The \'summary\'" />',
             frontmatter['open_graph_metadata'])
+
+    def test_has_open_graph_section(self):
+        director = self.factory.make_director()
+        extension = OpenGraphExtension(director.config)
+        with self.assertRaises(AbortError):
+            extension.on_pre_composition(director)