add list tags and list cards

1 files changed, 6 insertions, 2 deletions

diff --git a/natargs.py b/natargs.py
index 8e96d2c..f1438a7 100644
--- a/natargs.py
+++ b/natargs.py
@@ -44,10 +44,13 @@ def getarg(dict, l):
 			return resolved
 
 class Arguments:
+	def usage(self, i):
+		print(self.ustr)
+		sys.exit(i)
 	def execarg(self, args):
 		res = getarg(self.trie, args)
 		if res is None:
-			raise Exception
+			self.usage(1)
 		return res[0](res[1])
 
 	def addarg(self, args, chk, f):
@@ -55,5 +58,6 @@ class Arguments:
 			raise ValueError
 		self.trie = addargs(self.trie, args, args, chk, f)
 
-	def __init__(self):
+	def __init__(self, us):
 		self.trie = {}
+		self.ustr = us