Django 1.8: declare positional arguments in management commands

(imported from commit d9efca1376de92c8187d25f546c79fece8d2d8c6)

zerver/management/commands/query_ldap.py

@@ -10,11 +10,8 @@ from django_auth_ldap.backend import LDAPBackend, _LDAPUser
 
 
 # Run this on a cronjob to pick up on name changes.
-def query_ldap(*args):
-    if len(args) != 1:
-        print "Usage: query_ldap <email address>"
-        sys.exit(1)
-    email = args[0]
+def query_ldap(**options):
+    email = options['email']
     for backend in get_backends():
         if isinstance(backend, LDAPBackend):
             ldap_attrs = _LDAPUser(backend, backend.django_to_ldap_username(email)).attrs
@@ -25,5 +22,9 @@ def query_ldap(*args):
                     print "%s: %s" % (django_field, ldap_attrs[ldap_field])
 
 class Command(BaseCommand):
+    def add_arguments(self, parser):
+        parser.add_argument('email', metavar='<email>', type=str,
+                            help="email of user to query")
+
     def handle(self, *args, **options):
-        query_ldap(*args)
+        query_ldap(**options)