Added Versioned mixin class to get git commit hash

sciunit/utils.py

@@ -34,6 +34,7 @@
 from quantities.dimensionality import Dimensionality
 from quantities.quantity import Quantity
 import cypy
+import git
 
 PRINT_DEBUG_STATE = False # printd does nothing by default.
 
@@ -293,3 +294,24 @@ def decorate(*args, **kwargs):
 
 method_memoize = cypy.memoize
 
+
+class Versioned(object):
+    """
+    A Mixin class for SciUnit model instances, which provides a version string
+    based on the Git repository where the model is tracked.
+    Provided by Andrew Davison in issue #53.
+    """
+
+    def get_version(self):
+        module = sys.modules[self.__module__]
+        # We use module.__file__ instead of module.__path__[0]
+        # to include modules without a __path__ attribute.
+        path = os.path.realpath(module.__file__)
+        repo = git.Repo(path, search_parent_directories=True)
+        head = repo.head
+        version = head.commit.hexsha
+        if repo.is_dirty():
+            version += "*"
+        return version
+    version = property(get_version)
+

setup.py

@@ -34,7 +34,8 @@
                       'lxml',
                       'nbconvert',
                       'ipykernel',
-                      'nbformat',],
+                      'nbformat',
+                      'gitpython'],
     #dependency_links = ['git+https://github.com/python-quantities/python-quantities.git@master#egg=quantities-999'],
     entry_points={
         'console_scripts': [