From 4f92247ed6ded06aee06861f28d5eb0ad70caad7 Mon Sep 17 00:00:00 2001
From: Davis Goglin <davis.goglin@oregonicecream.com>
Date: Wed, 16 Mar 2016 16:21:05 -0700
Subject: [PATCH] Fix no help display in python3

---
 escpos/cli.py | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/escpos/cli.py b/escpos/cli.py
index 5dcda69..12e2aa1 100755
--- a/escpos/cli.py
+++ b/escpos/cli.py
@@ -3,6 +3,7 @@
 from __future__ import absolute_import
 
 import argparse
+import sys
 import six
 from . import config
 
@@ -308,12 +309,16 @@ def main():
         action='store_true',
     )
 
+    # Get only arguments actually passed
+    args_dict = vars(parser.parse_args())
+    if not args_dict:
+        parser.print_help()
+        sys.exit()
+    command_arguments = dict([k, v] for k, v in six.iteritems(args_dict) if v)
+
     if not printer:
         raise Exception('No printers loaded from config')
 
-    # Get only arguments actually passed
-    args_dict = vars(parser.parse_args())
-    command_arguments = dict([k, v] for k, v in six.iteritems(args_dict) if v)
 
     target_command = command_arguments.pop('func')