enh: add version checking

Author: mgxd

nipype/interfaces/dcm2nii.py

@@ -10,7 +10,19 @@
 
 from ..utils.filemanip import split_filename
 from .base import (CommandLine, CommandLineInputSpec, InputMultiPath, traits,
-                   TraitedSpec, OutputMultiPath, isdefined, File, Directory)
+                   TraitedSpec, OutputMultiPath, isdefined, File, Directory,
+                   PackageInfo)
+
+
+class Info(PackageInfo):
+    """Handle dcm2niix version information"""
+
+    version_cmd = 'dcm2niix'
+
+    @staticmethod
+    def parse_version(raw_info):
+        m = re.search(r'version (\S+)', raw_info)
+        return m[1] if m else None
 
 
 class Dcm2niiInputSpec(CommandLineInputSpec):
@@ -358,6 +370,10 @@ class Dcm2niix(CommandLine):
     output_spec = Dcm2niixOutputSpec
     _cmd = 'dcm2niix'
 
+    @property
+    def version(self):
+        return Info.version()
+
     def _format_arg(self, opt, spec, val):
         bools = ['bids_format', 'merge_imgs', 'single_file', 'verbose', 'crop',
                  'has_private', 'anon_bids', 'ignore_deriv', 'philips_float']

nipype/interfaces/tests/test_dcm2nii.py

@@ -3,7 +3,7 @@
 import shutil
 
 from nipype.interfaces.dcm2nii import Dcm2niix
-no_dcm2niix = not shutil.which(Dcm2niix()._cmd)
+no_dcm2niix = not bool(Dcm2niix().version)
 no_datalad = False
 try:
     from datalad import api # to pull and grab data