Refactor: split code into several django apps (we call them modules).

dav_base/management/commands/enable_module.py

@@ -0,0 +1,37 @@
+import os
+import pkg_resources
+from django.conf import settings
+from django.core.management.base import BaseCommand, CommandError
+
+from dav_base.config.modules import DJANGO_MAIN_MODULE, ModuleMeta
+
+
+class Command(BaseCommand):
+    help = 'Enable a modular app in django-dav installation.'
+
+    def add_arguments(self, parser):
+        parser.add_argument('module', help='the name of the module')
+
+    def handle(self, *args, **options):
+        django_base_dir = settings.BASE_DIR
+        django_main_module = DJANGO_MAIN_MODULE
+        module_name = options['module']
+
+        config = settings.MODULE_CONFIG
+
+        if module_name in config.modules.keys():
+            raise CommandError('Module \'{}\' is already enabled'.format(module_name))
+
+        settings_file_name = 'settings-{}.py'.format(module_name)
+        input_file = os.path.join('django_project_config', settings_file_name)
+        if pkg_resources.resource_exists(module_name, input_file):
+            output_file = os.path.join(django_base_dir, django_main_module, settings_file_name)
+            if not os.path.exists(output_file):
+                with open(output_file, 'w') as f:
+                    f.write(pkg_resources.resource_string(module_name, input_file))
+
+        module_meta_obj = ModuleMeta(module_name)
+        config.modules[module_name] = module_meta_obj
+        config.save()
+
+        self.stdout.write(self.style.SUCCESS('Module \'{}\' enabled.'.format(module_name)))