fixed mandatory multi paths

Author: chrisgorgo

nipype/utils/nipype_cmd.py

@@ -24,11 +24,14 @@ def add_options(parser=None, module=None, function=None):
         for name, spec in sorted(interface.inputs.traits(transient=None).items()):
             desc = "\n".join(interface._get_trait_desc(inputs, name, spec))[len(name)+2:]
             args = {}
-            if spec.is_trait_type(InputMultiPath):
-                args["nargs"]="*"
+            
             if hasattr(spec, "mandatory") and spec.mandatory:
+                if spec.is_trait_type(InputMultiPath):
+                    args["nargs"]="+"
                 parser.add_argument(name, help=desc, **args)
             else:
+                if spec.is_trait_type(InputMultiPath):
+                    args["nargs"]="*"
                 parser.add_argument("--%s"%name, dest=name,
                                     help=desc, **args)
     return parser, interface

nipype/utils/tests/test_cmd.py

@@ -91,7 +91,7 @@ def test_run_4d_realign_without_arguments(self):
                                                        [--start START]
                                                        [--time_interp TIME_INTERP]
                                                        [--tr_slices TR_SLICES]
-                                                       [in_file [in_file ...]]
+                                                       in_file [in_file ...]
                                                        tr
 nipype_cmd nipype.interfaces.nipy FmriRealign4d: error: too few arguments
 """)