Add oid parameter to log

ugit/cli.py

@@ -43,6 +43,7 @@ def parse_args():
 
     log_parser = commands.add_parser("log")
     log_parser.set_defaults(func=log)
+    log_parser.add_argument("oid", nargs="?")
 
     return parser.parse_args()
 
@@ -75,7 +76,7 @@ def commit(args):
 
 
 def log(args):
-    oid = data.get_HEAD()
+    oid = args.oid or data.get_HEAD()
     while oid:
         commit = base.get_commit(oid)