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Original file line number Diff line number Diff line change
Expand Up @@ -93,7 +93,7 @@ def test_SampleToSurface_inputs():
),
subject_id=dict(),
subjects_dir=dict(),
surf_reg=dict(argstr='--surfreg',
surf_reg=dict(argstr='--surfreg %s',
requires=['target_subject'],
),
surface=dict(argstr='--surf %s',
Expand Down
9 changes: 7 additions & 2 deletions nipype/interfaces/freesurfer/utils.py
Original file line number Diff line number Diff line change
Expand Up @@ -139,8 +139,9 @@ class SampleToSurfaceInputSpec(FSTraitedSpec):
subject_id = traits.String(desc="subject id")
target_subject = traits.String(argstr="--trgsubject %s",
desc="sample to surface of different subject than source")
surf_reg = traits.Bool(argstr="--surfreg", requires=["target_subject"],
desc="use surface registration to target subject")
surf_reg = traits.Either(traits.Bool, traits.Str(),
argstr="--surfreg %s", requires=["target_subject"],
desc="use surface registration to target subject")
ico_order = traits.Int(argstr="--icoorder %d", requires=["target_subject"],
desc="icosahedron order when target_subject is 'ico'")

Expand Down Expand Up @@ -238,6 +239,10 @@ def _format_arg(self, name, spec, value):

if value in implicit_filetypes:
return ""
if name == 'surf_reg':
if value is True:
return spec.argstr % 'sphere.reg'

return super(SampleToSurface, self)._format_arg(name, spec, value)

def _get_outfilename(self, opt="out_file"):
Expand Down