ENH: Add pre- and post-run hooks to BaseInterface

Author: effigies

nipype/interfaces/base/core.py

@@ -517,7 +517,9 @@ def run(self, cwd=None, ignore_exception=None, **inputs):
         outputs = None
 
         try:
+            runtime = self._pre_run_hook(runtime)
             runtime = self._run_interface(runtime)
+            runtime = self._post_run_hook(runtime)
             outputs = self.aggregate_outputs(runtime)
         except Exception as e:
             import traceback
@@ -653,6 +655,28 @@ def save_inputs_to_json(self, json_file):
         with open(json_file, 'w' if PY3 else 'wb') as fhandle:
             json.dump(inputs, fhandle, indent=4, ensure_ascii=False)
 
+    def _pre_run_hook(self, runtime):
+        """
+        Perform any pre-_run_interface() processing
+
+        Subclasses may override this function to modify ``runtime`` object or
+        interface state
+
+        MUST return runtime object
+        """
+        return runtime
+
+    def _post_run_hook(self, runtime):
+        """
+        Perform any post-_run_interface() processing
+
+        Subclasses may override this function to modify ``runtime`` object or
+        interface state
+
+        MUST return runtime object
+        """
+        return runtime
+
 
 class SimpleInterface(BaseInterface):
     """ An interface pattern that allows outputs to be set in a dictionary