plugin-barcode: exit delay() when input on stdin

client-barcode/freitagskasse.py

@@ -93,8 +93,10 @@ def delay(what, seconds):
 			sys.stdout.write('\r')
 		sys.stdout.write('%s in %d Sekunden... ' % (what, i))
 		sys.stdout.flush()
-		time.sleep(1)
-
+		(read_list, _, _) = select([sys.stdin], [], [], 1)
+		if len(read_list) > 0:
+			# input on stdin, quit delay
+			return
 
 def warn_balance():
 	print('Kontostand im Minus, bitte Geld aufladen.')