doc: added commandline flag and position generation to help string

Author: satra

nipype/interfaces/base.py

@@ -731,6 +731,7 @@ def _get_trait_desc(self, inputs, name, spec):
         desc = spec.desc
         xor = spec.xor
         requires = spec.requires
+        argstr = spec.argstr
 
         manhelpstr = ['\t%s' % name]
 
@@ -753,6 +754,17 @@ def _get_trait_desc(self, inputs, name, spec):
                                    initial_indent='\t\t',
                                    subsequent_indent='\t\t')
 
+        if argstr:
+            pos = spec.position
+            if pos is not None:
+                manhelpstr += wrap('flag: %s, position: %s' % (argstr, pos), 70,
+                                   initial_indent='\t\t',
+                                   subsequent_indent='\t\t')
+            else:
+                manhelpstr += wrap('flag: %s' % argstr, 70,
+                                   initial_indent='\t\t',
+                                   subsequent_indent='\t\t')
+
         if xor:
             line = '%s' % ', '.join(xor)
             manhelpstr += wrap(line, 70,