initial idea of freesurfer analyzer, lacks adapter

I want to start adding funcitonality

scientific_library/tvb/analyzers/freesurfer.py

+import os.path
+import subprocess
+from tvb.datatypes.volumes import Volume, VolumeInFile, FreeSurferSubject
+from tvb.basic.neotraits.api import HasTraits, Attr
+
+class FreeSurferRun(HasTraits):
+    input_T1 = Volume(label="Input T1.")
+    def evaluate(self):
+        vol: VolumeInFile = VolumeInFile.from_volume(self.input_T1)
+        path = vol.file_path
+        tmp_dir = '/tmp/tvb-fs'
+        cmd = 'freesurfer -i {} -all -s {}'
+        proc = subprocess.Popen(
+            cmd.format(path, 'tvb').split(),
+            env={'SUBJECTS_DIR': tmp_dir},
+            stderr=subprocess.STDIN,
+            stdin=subprocess.PIPE,
+        )
+        proc.wait()
+        return FreeSurferSubject(
+            subject_folder=os.path.join(tmp_dir, 'tvb'))
\ No newline at end of file

scientific_library/tvb/datatypes/volumes.py

@@ -53,3 +53,21 @@ class Volume(HasTraits):
             "Voxel size": self.voxel_size,
             "Units": self.voxel_unit
         }
+
+
+class VolumeInFile(Volume):
+    """
+    Volume in a file.
+    """
+    file_path = Attr(str, label="Path to data files.")
+
+    @classmethod
+    def from_volume(self, vol: Volume):
+        raise NotImplemented
+
+
+class FreeSurferSubject(HasTraits):
+    """
+    Analysis of volume by FreeSurfer
+    """
+    subject_folder = Volume(label="Input data for analysis.")