Re-implemented 'user' config level based on suggestion by @jzempel

The point is that XDG_CONFIG_HOME is meant to point at the '.config' directory,
whereas '.config' has to be added only if HOME is used instead.

Fixes #160

Author: Byron

git/repo/base.py

@@ -354,12 +354,8 @@ def _get_config_path(self, config_level):
         if config_level == "system":
             return "/etc/gitconfig"
         elif config_level == "user":
-            for evar in ("XDG_CONFIG_HOME", "HOME"):
-                if evar not in os.environ:
-                    continue
-                return os.path.join(os.environ[evar], '.config/git/config')
-            # end for each evar to check
-            raise AssertionError("Didn't find a single HOME related environment variable")
+            config_home = os.environ.get("XDG_CONFIG_HOME") or join(os.environ.get("HOME", '~'), ".config")
+            return os.path.expanduser(join(config_home, "git", "config"))
         elif config_level == "global":
             return os.path.normpath(os.path.expanduser("~/.gitconfig"))
         elif config_level == "repository":