add git command options

Add __call__ method to Git object to allow
passing git command options to the executable
requires flag to transform_kwargs
add unit test

Change-Id: If1bc01008e66d3fd3811c15b56e58f38c95b9887

Author: Eric Brunson

git/cmd.py

@@ -388,15 +388,18 @@ def execute(self, command,
         else:
             return stdout_value
 
-    def transform_kwargs(self, **kwargs):
+    def transform_kwargs(self, split_single_char_options=False, **kwargs):
         """Transforms Python style kwargs into git command line options."""
         args = list()
         for k, v in kwargs.items():
             if len(k) == 1:
                 if v is True:
                     args.append("-%s" % k)
                 elif type(v) is not bool:
-                    args.append("-%s%s" % (k, v))
+                    if split_single_char_options:
+                        args.extend(["-%s" % k, "%s" % v])
+                    else:
+                        args.append("-%s%s" % (k, v))
             else:
                 if v is True:
                     args.append("--%s" % dashify(k))
@@ -431,7 +434,8 @@ def __call__(self, **kwargs):
 
         ``Examples``::
             git(work_tree='/tmp').difftool()"""
-        self._git_options = self.transform_kwargs(**kwargs)
+        self._git_options = self.transform_kwargs(
+            split_single_char_options=True, **kwargs)
         return self
 
     def _call_process(self, method, *args, **kwargs):

git/test/test_git.py

@@ -107,3 +107,15 @@ def test_cmd_override(self):
         finally:
             type(self.git).GIT_PYTHON_GIT_EXECUTABLE = prev_cmd
         #END undo adjustment
+
+    def test_options_are_passed_to_git(self):
+        # This work because any command after git --version is ignored
+        git_version = self.git(version=True).NoOp()
+        git_command_version = self.git.version()
+        self.assertEquals(git_version, git_command_version)
+
+    def test_single_char_git_options_are_passed_to_git(self):
+        input_value='TestValue'
+        output_value = self.git(c='user.name={}'.format(input_value)).config('--get', 'user.name')
+        self.assertEquals(input_value, output_value)
+