Fixed Nargs issue (#39)

gooey/gui/components.py

@@ -69,10 +69,16 @@ class AbstractComponent(object):
     return base_text
 
   def HasNargs(self, action):
-    return action.nargs == '+' or action.nargs == '?'
+    return action.nargs is not None and action.nargs is not 0
+
 
   def CreateNargsMsg(self, action):
-    return ' (Note: at least 1 or more arguments are required)'
+    if isinstance(action.nargs, int):
+      return '\n(Note: exactly {} arguments are required)'.format(action.nargs)
+    elif action.nargs == '+':
+      return '\n(Note: at least 1 or more arguments are required)'
+    return ''
+
 
   def CreateNameLabelWidget(self, parent, action):
     label = str(action.dest).title()

gooey/mockapplications/mockapp_nargs.py

@@ -0,0 +1,22 @@
+import sys
+import argparse
+from gooey import Gooey
+
+
+sys.argv.extend(['1', '2', '3', '4', '--sum'])
+
+# @Gooey
+def main():
+  parser = argparse.ArgumentParser(description='Process some integers.')
+  parser.add_argument('integers', metavar='N', type=int, nargs="+",
+                     help='an integer for the accumulator')
+  parser.add_argument('--sum', dest='accumulate', action='store_const',
+                     const=sum, default=max,
+                     help='sum the integers (default: find the max)')
+
+  args = parser.parse_args()
+  print args.accumulate(args.integers)
+
+
+if __name__ == '__main__':
+  main()