from django.core.management.base import NoArgsCommand

def module_to_dict(module, omittable=lambda k: k.startswith('_')):

    "Converts a module namespace to a Python dictionary. Used by get_settings_diff."

    return dict([(k, repr(v)) for k, v in module.__dict__.items() if not omittable(k)])

class Command(NoArgsCommand):

    help = """Displays differences between the current settings.py and Django's

    default settings. Settings that don't appear in the defaults are

    followed by "###"."""

    requires_model_validation = False

    def handle_noargs(self, **options):

        # Inspired by Postfix's "postconf -n".

        from django.conf import settings, global_settings

        # Because settings are imported lazily, we need to explicitly load them.

        settings._setup()

        user_settings = module_to_dict(settings._wrapped)

        default_settings = module_to_dict(global_settings)

        output = []

        keys = user_settings.keys()

        keys.sort()

        for key in keys:

            if key not in default_settings:

                output.append("%s = %s  ###" % (key, user_settings[key]))

            elif user_settings[key] != default_settings[key]:

                output.append("%s = %s" % (key, user_settings[key]))

        return '\n'.join(output)