fsl randomise f_only flag contains typo, can't work

[henrymj]

Summary

when calling randomise with f_only=True, nipypes interfaces appends --f_only instead of --fonly. This is incorrect and prevents the call from working.

The offending line is here, where the last bit should be argstr="--fonly"

Actual behavior

appending --fonly to the randomise call.

Expected behavior

--f_only is appended, breaking the call.

Script/Workflow details

    fsl_randomise = mem.cache(fsl.Randomise)
    randomise_results = fsl_randomise(
        in_file=`fourdimage.nii`,
        mask=`mask.nii`,
        num_perm=10000,
        f_only=True,
        **kwargs
        )

Platform details:

{'commit_hash': 'c5ce0e2c9',
 'commit_source': 'installation',
 'networkx_version': '2.5',
 'nibabel_version': '3.2.1',
 'nipype_version': '1.4.2',
 'numpy_version': '1.20.1',
 'pkg_path': '/usr/local/miniconda/lib/python3.7/site-packages/nipype',
 'scipy_version': '1.6.1',
 'sys_executable': '/usr/local/miniconda/bin/python',
 'sys_platform': 'linux',
 'sys_version': '3.7.4 (default, Aug 13 2019, 20:35:49) \n[GCC 7.3.0]',
 'traits_version': '6.2.0'}

[effigies]

What version of FSL? Are we sure that or didn't change from one to the other?

Would you be up for submitting a PR?

[henrymj]

FSL Version 6.0. I just scrolled through the FSL history here and didn't see any references to changing the command-line interface, but I may not be digging deep enough.

I can submit a PR later in the week if no objections arise in the meantime!