Use current issue number for git cl patch

git_cl.py

Index: git_cl.py
diff --git a/git_cl.py b/git_cl.py
index 5441c1801b0fc1a92a86588195f108a4d710f391..f779c361526b88b292ca3f1581b5ba242d1ac05e 100755
--- a/git_cl.py
+++ b/git_cl.py
@@ -2945,15 +2945,23 @@ def CMDpatch(parser, args):
                         'attempting a 3-way merge')
   parser.add_option('-n', '--no-commit', action='store_true', dest='nocommit',
                     help="don't commit after patch applies")
+  parser.add_option('--reapply', action='store_true',
+                    dest='reapply',
+                    help="""Reapply the issue currently associated with the
+branch. Error if none, or if issue is also explicitly provided.""")
   auth.add_auth_options(parser)
   (options, args) = parser.parse_args(args)
   auth_config = auth.extract_auth_config_from_options(options)
 
-  if len(args) != 1:
-    parser.print_help()
-    return 1
+  issue_arg = None
+  if (options.reapply) :
+    if len(args) == 1:

[iannucci, 2016/01/29 00:54:48]

if len(args) < 0

I think is what you want. --reapply implies 'no extra arguments' right?

[Mircea Trofin, 2016/01/29 05:01:49]

I'm confused, can len(args) be negative?

+      parser.print_help()
+      return 1
+    issue_arg = Changelist().GetIssue()
+  elif len(args) == 1:
+    issue_arg = ParseIssueNum(args[0])
 
-  issue_arg = ParseIssueNum(args[0])
   # The patch URL works because ParseIssueNum won't do any substitution
   # as the re.sub pattern fails to match and just returns it.
   if issue_arg == None: