Factor out code for getting paths inside XDG config home.

dulwich/config.py

@@ -487,6 +487,13 @@ class ConfigFile(ConfigDict):
                 f.write(b"\t" + key + b" = " + value + b"\n")
 
 
+def get_xdg_config_home_path(*path_segments):
+    xdg_config_home = os.environ.get(
+        "XDG_CONFIG_HOME", os.path.expanduser("~/.config/"),
+    )
+    return os.path.join(xdg_config_home, *path_segments)
+
+
 class StackedConfig(Config):
     """Configuration which reads from multiple config files.."""
 
@@ -509,11 +516,7 @@ class StackedConfig(Config):
         """
         paths = []
         paths.append(os.path.expanduser("~/.gitconfig"))
-
-        xdg_config_home = os.environ.get(
-            "XDG_CONFIG_HOME", os.path.expanduser("~/.config/"),
-        )
-        paths.append(os.path.join(xdg_config_home, "git", "config"))
+        paths.append(get_xdg_config_home_path("git", "config"))
 
         if "GIT_CONFIG_NOSYSTEM" not in os.environ:
             paths.append("/etc/gitconfig")

dulwich/ignore.py

@@ -26,6 +26,8 @@ import os.path
 import re
 import sys
 
+from dulwich.config import get_xdg_config_home_path
+
 
 def _translate_segment(segment):
     if segment == b"*":
@@ -271,8 +273,7 @@ def default_user_ignore_filter_path(config):
     except KeyError:
         pass
 
-    xdg_config_home = os.environ.get("XDG_CONFIG_HOME", "~/.config/")
-    return os.path.join(xdg_config_home, 'git', 'ignore')
+    return get_xdg_config_home_path('git', 'ignore')
 
 
 class IgnoreFilterManager(object):