# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1473350827 -7200
# Node ID 22b071aeca2fbb6845597760d1699185a9aef2cc
# Parent  077db54bcdc19c320f047b592c4cde9146c89e02
Added commentary about finding additional required modules.

diff -r 077db54bcdc1 -r 22b071aeca2f importer.py
--- a/importer.py	Thu Sep 08 14:03:19 2016 +0200
+++ b/importer.py	Thu Sep 08 18:07:07 2016 +0200
@@ -372,10 +372,19 @@
                         else:
                             self.required.add(provider)
 
+        # Check modules again to see if they are now required and should now
+        # cause the inclusion of other modules providing objects to the program.
+
         for module_name in self.waiting.keys():
             self.require_providers(module_name)
 
     def require_providers(self, module_name):
+
+        """
+        Test if 'module_name' is itself required and, if so, require modules
+        containing objects provided to the module.
+        """
+
         if module_name in self.required and self.waiting.has_key(module_name):
             for provider in self.waiting[module_name]:
                 if provider not in self.required: