# emacs: -*- mode: python; py-indent-offset: 4; indent-tabs-mode: nil -*-
# vi: set ft=python sts=4 ts=4 sw=4 et:
"""
    Change directory to provide relative paths for doctests
    >>> import os
    >>> filepath = os.path.dirname( os.path.realpath( __file__ ) )
    >>> datadir = os.path.realpath(os.path.join(filepath, '../../testing/data'))
    >>> os.chdir(datadir)

"""

from nipype.interfaces.base import CommandLineInputSpec, CommandLine, traits, TraitedSpec, File, InputMultiPath, isdefined
from nipype.utils.filemanip import split_filename
import os.path as op

class MRConvertInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='voxel-order data filename')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output filename')
    extract_at_axis = traits.Enum(1,2,3, argstr='-coord %s', position=1,
                           desc='"Extract data only at the coordinates specified. This option specifies the Axis. Must be used in conjunction with extract_at_coordinate.')
    extract_at_coordinate = traits.List(traits.Float, argstr='%s', sep=',', position=2, minlen=1, maxlen=3,
        desc='"Extract data only at the coordinates specified. This option specifies the coordinates. Must be used in conjunction with extract_at_axis. Three comma-separated numbers giving the size of each voxel in mm.')
    voxel_dims = traits.List(traits.Float, argstr='-vox %s', sep=',',
        position=3, minlen=3, maxlen=3,
        desc='Three comma-separated numbers giving the size of each voxel in mm.')
    output_datatype = traits.Enum("nii", "float", "char", "short", "int", "long", "double", argstr='-output %s', position=2,
                           desc='"i.e. Bfloat". Can be "char", "short", "int", "long", "float" or "double"') #, usedefault=True)
    extension = traits.Enum("mif","nii", "float", "char", "short", "int", "long", "double", position=2,
                           desc='"i.e. Bfloat". Can be "char", "short", "int", "long", "float" or "double"', usedefault=True)
    layout = traits.Enum("nii", "float", "char", "short", "int", "long", "double", argstr='-output %s', position=2,
                           desc='specify the layout of the data in memory. The actual layout produced will depend on whether the output image format can support it.')
    resample = traits.Float(argstr='-scale %d', position=3,
        units='mm', desc='Apply scaling to the intensity values.')
    offset_bias = traits.Float(argstr='-scale %d', position=3,
        units='mm', desc='Apply offset to the intensity values.')
    replace_NaN_with_zero = traits.Bool(argstr='-zero', position=3, desc="Replace all NaN values with zero.")
    prs = traits.Bool(argstr='-prs', position=3, desc="Assume that the DW gradients are specified in the PRS frame (Siemens DICOM only).")

class MRConvertOutputSpec(TraitedSpec):
    converted = File(exists=True, desc='path/name of 4D volume in voxel order')

class MRConvert(CommandLine):
    """
    Perform conversion between different file types and optionally extract a subset of the input image.

    If used correctly, this program can be a very useful workhorse.
    In addition to converting images between different formats, it can
    be used to extract specific studies from a data set, extract a specific
    region of interest, flip the images, or to scale the intensity of the images.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> mrconvert = mrt.MRConvert()
    >>> mrconvert.inputs.in_file = 'dwi_FA.mif'
    >>> mrconvert.inputs.out_filename = 'dwi_FA.nii'
    >>> mrconvert.run()                                 # doctest: +SKIP
    """

    _cmd = 'mrconvert'
    input_spec=MRConvertInputSpec
    output_spec=MRConvertOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['converted'] = self.inputs.out_filename
        if not isdefined(outputs['converted']):
            outputs['converted'] = op.abspath(self._gen_outfilename())
        else:
            outputs['converted'] = op.abspath(outputs['converted'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        if isdefined(self.inputs.out_filename):
            outname = self.inputs.out_filename
        else:
            outname = name + '_mrconvert.' + self.inputs.extension
        return outname

class DWI2TensorInputSpec(CommandLineInputSpec):
    in_file = InputMultiPath(File(exists=True), argstr='%s', mandatory=True,
                             position=-2, desc='Diffusion-weighted images')
    out_filename = File(name_template="%s_tensor.mif", name_source="in_file",
                        output_name="tensor", argstr='%s',
                        desc='Output tensor filename', position=-1)
    encoding_file = File(argstr='-grad %s', position=2,
                         desc=('Encoding file supplied as a 4xN text file with '
                               'each line is in the format [ X Y Z b ], where '
                               '[ X Y Z ] describe the direction of the applied '
                               'gradient, and b gives the b-value in units '
                               '(1000 s/mm^2). See FSL2MRTrix()'))
    ignore_slice_by_volume = traits.List(traits.Int, argstr='-ignoreslices %s',
                                         sep=' ', position=2, minlen=2,
                                         maxlen=2,
                                         desc=('Requires two values (i.e. [34 '
                                               '1] for [Slice Volume] Ignores '
                                               'the image slices specified '
                                               'when computing the tensor. '
                                               'Slice here means the z '
                                               'coordinate of the slice to be '
                                               'ignored.'))
    ignore_volumes = traits.List(traits.Int, argstr='-ignorevolumes %s',
                                 sep=' ', position=2, minlen=1,
                                 desc=('Requires two values (i.e. [2 5 6] for '
                                       '[Volumes] Ignores the image volumes '
                                       'specified when computing the tensor.'))
    quiet = traits.Bool(argstr='-quiet', position=1,
                        desc=("Do not display information messages or progress "
                              "status."))
    debug = traits.Bool(argstr='-debug', position=1,
                        desc="Display debugging messages.")


class DWI2TensorOutputSpec(TraitedSpec):
    tensor = File(exists=True,
                  desc='path/name of output diffusion tensor image')


class DWI2Tensor(CommandLine):
    """
    Converts diffusion-weighted images to tensor images.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> dwi2tensor = mrt.DWI2Tensor()
    >>> dwi2tensor.inputs.in_file = 'dwi.mif'
    >>> dwi2tensor.inputs.encoding_file = 'encoding.txt'
    >>> dwi2tensor.cmdline
    'dwi2tensor -grad encoding.txt dwi.mif dwi_tensor.mif'
    >>> dwi2tensor.run()                                   # doctest: +SKIP
    """

    _cmd = 'dwi2tensor'
    input_spec=DWI2TensorInputSpec
    output_spec=DWI2TensorOutputSpec

class Tensor2VectorInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='Diffusion tensor image')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output vector filename')
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class Tensor2VectorOutputSpec(TraitedSpec):
    vector = File(exists=True, desc='the output image of the major eigenvectors of the diffusion tensor image.')

class Tensor2Vector(CommandLine):
    """
    Generates a map of the major eigenvectors of the tensors in each voxel.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> tensor2vector = mrt.Tensor2Vector()
    >>> tensor2vector.inputs.in_file = 'dwi_tensor.mif'
    >>> tensor2vector.run()                             # doctest: +SKIP
    """

    _cmd = 'tensor2vector'
    input_spec=Tensor2VectorInputSpec
    output_spec=Tensor2VectorOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['vector'] = self.inputs.out_filename
        if not isdefined(outputs['vector']):
            outputs['vector'] = op.abspath(self._gen_outfilename())
        else:
            outputs['vector'] = op.abspath(outputs['vector'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_vector.mif'

class Tensor2FractionalAnisotropyInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='Diffusion tensor image')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output Fractional Anisotropy filename')
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class Tensor2FractionalAnisotropyOutputSpec(TraitedSpec):
    FA = File(exists=True, desc='the output image of the major eigenvectors of the diffusion tensor image.')

class Tensor2FractionalAnisotropy(CommandLine):
    """
    Generates a map of the fractional anisotropy in each voxel.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> tensor2FA = mrt.Tensor2FractionalAnisotropy()
    >>> tensor2FA.inputs.in_file = 'dwi_tensor.mif'
    >>> tensor2FA.run()                                 # doctest: +SKIP
    """

    _cmd = 'tensor2FA'
    input_spec=Tensor2FractionalAnisotropyInputSpec
    output_spec=Tensor2FractionalAnisotropyOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['FA'] = self.inputs.out_filename
        if not isdefined(outputs['FA']):
            outputs['FA'] = op.abspath(self._gen_outfilename())
        else:
            outputs['FA'] = op.abspath(outputs['FA'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_FA.mif'

class Tensor2ApparentDiffusionInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='Diffusion tensor image')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output Fractional Anisotropy filename')
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class Tensor2ApparentDiffusionOutputSpec(TraitedSpec):
    ADC = File(exists=True, desc='the output image of the major eigenvectors of the diffusion tensor image.')

class Tensor2ApparentDiffusion(CommandLine):
    """
    Generates a map of the apparent diffusion coefficient (ADC) in each voxel

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> tensor2ADC = mrt.Tensor2ApparentDiffusion()
    >>> tensor2ADC.inputs.in_file = 'dwi_tensor.mif'
    >>> tensor2ADC.run()                                # doctest: +SKIP
    """

    _cmd = 'tensor2ADC'
    input_spec=Tensor2ApparentDiffusionInputSpec
    output_spec=Tensor2ApparentDiffusionOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['ADC'] = self.inputs.out_filename
        if not isdefined(outputs['ADC']):
            outputs['ADC'] = op.abspath(self._gen_outfilename())
        else:
            outputs['ADC'] = op.abspath(outputs['ADC'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_ADC.mif'

class MRMultiplyInputSpec(CommandLineInputSpec):
    in_files = InputMultiPath(File(exists=True),
                              argstr='%s', mandatory=True, position=-2,
                              desc='Input images to be multiplied')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output image filename')
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class MRMultiplyOutputSpec(TraitedSpec):
    out_file = File(exists=True, desc='the output image of the multiplication')

class MRMultiply(CommandLine):
    """
    Multiplies two images.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> MRmult = mrt.MRMultiply()
    >>> MRmult.inputs.in_files = ['dwi.mif', 'dwi_WMProb.mif']
    >>> MRmult.run()                                             # doctest: +SKIP
    """

    _cmd = 'mrmult'
    input_spec=MRMultiplyInputSpec
    output_spec=MRMultiplyOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['out_file'] = self.inputs.out_filename
        if not isdefined(outputs['out_file']):
            outputs['out_file'] = op.abspath(self._gen_outfilename())
        else:
            outputs['out_file'] = op.abspath(outputs['out_file'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_files[0])
        return name + '_MRMult.mif'

class MRTrixViewerInputSpec(CommandLineInputSpec):
    in_files = InputMultiPath(File(exists=True), argstr='%s', mandatory=True,
                              position=-2,
                              desc='Input images to be viewed')
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class MRTrixViewerOutputSpec(TraitedSpec):
    pass

class MRTrixViewer(CommandLine):
    """
    Loads the input images in the MRTrix Viewer.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> MRview = mrt.MRTrixViewer()
    >>> MRview.inputs.in_files = 'dwi.mif'
    >>> MRview.run()                                    # doctest: +SKIP
    """

    _cmd = 'mrview'
    input_spec=MRTrixViewerInputSpec
    output_spec=MRTrixViewerOutputSpec

    def _list_outputs(self):
        return

class MRTrixInfoInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='Input images to be read')

class MRTrixInfoOutputSpec(TraitedSpec):
    pass

class MRTrixInfo(CommandLine):
    """
    Prints out relevant header information found in the image specified.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> MRinfo = mrt.MRTrixInfo()
    >>> MRinfo.inputs.in_file = 'dwi.mif'
    >>> MRinfo.run()                                    # doctest: +SKIP
    """

    _cmd = 'mrinfo'
    input_spec=MRTrixInfoInputSpec
    output_spec=MRTrixInfoOutputSpec

    def _list_outputs(self):
        return

class GenerateWhiteMatterMaskInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-3, desc='Diffusion-weighted images')
    binary_mask = File(exists=True, argstr='%s', mandatory=True, position = -2, desc='Binary brain mask')
    out_WMProb_filename = File(genfile=True, argstr='%s', position = -1, desc='Output WM probability image filename')
    encoding_file = File(exists=True, argstr='-grad %s', mandatory=True, position=1,
    desc='Gradient encoding, supplied as a 4xN text file with each line is in the format [ X Y Z b ], where [ X Y Z ] describe the direction of the applied gradient, and b gives the b-value in units (1000 s/mm^2). See FSL2MRTrix')
    noise_level_margin = traits.Float(argstr='-margin %s', desc='Specify the width of the margin on either side of the image to be used to estimate the noise level (default = 10)')

class GenerateWhiteMatterMaskOutputSpec(TraitedSpec):
    WMprobabilitymap = File(exists=True, desc='WMprobabilitymap')

class GenerateWhiteMatterMask(CommandLine):
    """
    Generates a white matter probability mask from the DW images.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> genWM = mrt.GenerateWhiteMatterMask()
    >>> genWM.inputs.in_file = 'dwi.mif'
    >>> genWM.inputs.encoding_file = 'encoding.txt'
    >>> genWM.run()                                     # doctest: +SKIP
    """

    _cmd = 'gen_WM_mask'
    input_spec=GenerateWhiteMatterMaskInputSpec
    output_spec=GenerateWhiteMatterMaskOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['WMprobabilitymap'] = op.abspath(self._gen_outfilename())
        return outputs

    def _gen_filename(self, name):
        if name is 'out_WMProb_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_WMProb.mif'

class ErodeInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='Input mask image to be eroded')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output image filename')
    number_of_passes = traits.Int(argstr='-npass %s', desc='the number of passes (default: 1)')
    dilate = traits.Bool(argstr='-dilate', position=1, desc="Perform dilation rather than erosion")
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class ErodeOutputSpec(TraitedSpec):
    out_file = File(exists=True, desc='the output image')

class Erode(CommandLine):
    """
    Erode (or dilates) a mask (i.e. binary) image

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> erode = mrt.Erode()
    >>> erode.inputs.in_file = 'mask.mif'
    >>> erode.run()                                     # doctest: +SKIP
    """
    _cmd = 'erode'
    input_spec=ErodeInputSpec
    output_spec=ErodeOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['out_file'] = self.inputs.out_filename
        if not isdefined(outputs['out_file']):
            outputs['out_file'] = op.abspath(self._gen_outfilename())
        else:
            outputs['out_file'] = op.abspath(outputs['out_file'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_erode.mif'

class ThresholdInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='The input image to be thresholded')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='The output binary image mask.')
    absolute_threshold_value = traits.Float(argstr='-abs %s', desc='Specify threshold value as absolute intensity.')
    percentage_threshold_value = traits.Float(argstr='-percent %s', desc='Specify threshold value as a percentage of the peak intensity in the input image.')
    invert = traits.Bool(argstr='-invert', position=1, desc="Invert output binary mask")
    replace_zeros_with_NaN = traits.Bool(argstr='-nan', position=1, desc="Replace all zero values with NaN")
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class ThresholdOutputSpec(TraitedSpec):
    out_file = File(exists=True, desc='The output binary image mask.')

class Threshold(CommandLine):
    """
    Create bitwise image by thresholding image intensity.

    By default, the threshold level is determined using a histogram analysis
    to cut out the background. Otherwise, the threshold intensity can be
    specified using command line options.
    Note that only the first study is used for thresholding.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> thresh = mrt.Threshold()
    >>> thresh.inputs.in_file = 'wm_mask.mif'
    >>> thresh.run()                                             # doctest: +SKIP
    """

    _cmd = 'threshold'
    input_spec=ThresholdInputSpec
    output_spec=ThresholdOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['out_file'] = self.inputs.out_filename
        if not isdefined(outputs['out_file']):
            outputs['out_file'] = op.abspath(self._gen_outfilename())
        else:
            outputs['out_file'] = op.abspath(outputs['out_file'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_thresh.mif'

class MedianFilter3DInputSpec(CommandLineInputSpec):
    in_file = File(exists=True, argstr='%s', mandatory=True, position=-2,
        desc='Input images to be smoothed')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output image filename')
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class MedianFilter3DOutputSpec(TraitedSpec):
    out_file = File(exists=True, desc='the output image')

class MedianFilter3D(CommandLine):
    """
    Smooth images using a 3x3x3 median filter.

    Example
    -------

    >>> import nipype.interfaces.mrtrix as mrt
    >>> median3d = mrt.MedianFilter3D()
    >>> median3d.inputs.in_file = 'mask.mif'
    >>> median3d.run()                                  # doctest: +SKIP
    """

    _cmd = 'median3D'
    input_spec=MedianFilter3DInputSpec
    output_spec=MedianFilter3DOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['out_file'] = self.inputs.out_filename
        if not isdefined(outputs['out_file']):
            outputs['out_file'] = op.abspath(self._gen_outfilename())
        else:
            outputs['out_file'] = op.abspath(outputs['out_file'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_file)
        return name + '_median3D.mif'

class MRTransformInputSpec(CommandLineInputSpec):
    in_files = InputMultiPath(File(exists=True), argstr='%s', mandatory=True,
                              position=-2,
                              desc='Input images to be transformed')
    out_filename = File(genfile=True, argstr='%s', position=-1, desc='Output image')
    invert = traits.Bool(argstr='-inverse', position=1, desc="Invert the specified transform before using it")
    replace_transform = traits.Bool(argstr='-replace', position=1, desc="replace the current transform by that specified, rather than applying it to the current transform")
    transformation_file = File(exists=True, argstr='-transform %s', position=1,
        desc='The transform to apply, in the form of a 4x4 ascii file.')
    template_image = File(exists=True, argstr='-template %s', position=1,
        desc='Reslice the input image to match the specified template image.')
    reference_image = File(exists=True, argstr='-reference %s', position=1,
        desc='in case the transform supplied maps from the input image onto a reference image, use this option to specify the reference. Note that this implicitly sets the -replace option.')
    flip_x = traits.Bool(argstr='-flipx', position=1, desc="assume the transform is supplied assuming a coordinate system with the x-axis reversed relative to the MRtrix convention (i.e. x increases from right to left). This is required to handle transform matrices produced by FSL's FLIRT command. This is only used in conjunction with the -reference option.")
    quiet = traits.Bool(argstr='-quiet', position=1, desc="Do not display information messages or progress status.")
    debug = traits.Bool(argstr='-debug', position=1, desc="Display debugging messages.")

class MRTransformOutputSpec(TraitedSpec):
    out_file = File(exists=True, desc='the output image of the transformation')

class MRTransform(CommandLine):
    """
    Apply spatial transformations or reslice images

    Example
    -------

    >>> MRxform = MRTransform()
    >>> MRxform.inputs.in_files = 'anat_coreg.mif'
    >>> MRxform.run()                                   # doctest: +SKIP
    """

    _cmd = 'mrtransform'
    input_spec=MRTransformInputSpec
    output_spec=MRTransformOutputSpec

    def _list_outputs(self):
        outputs = self.output_spec().get()
        outputs['out_file'] = self.inputs.out_filename
        if not isdefined(outputs['out_file']):
            outputs['out_file'] = op.abspath(self._gen_outfilename())
        else:
            outputs['out_file'] = op.abspath(outputs['out_file'])
        return outputs

    def _gen_filename(self, name):
        if name is 'out_filename':
            return self._gen_outfilename()
        else:
            return None
    def _gen_outfilename(self):
        _, name , _ = split_filename(self.inputs.in_files[0])
        return name + '_MRTransform.mif'
