[RFC PATCH 04/13] b4: resolve platform-native data and cache directories

XDG_DATA_HOME and XDG_CACHE_HOME are honoured when set, covering custom
Linux/macOS setups.  Add a Windows branch that reads APPDATA (for data)
and LOCALAPPDATA (for cache) before falling back to the
pathlib.Path.home() equivalents, matching the Windows platform
convention.

Signed-off-by: Adrian Neftali Sanchez <[email protected]>
---
 src/b4/__init__.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/b4/__init__.py b/src/b4/__init__.py
index e878d34..bddf2db 100644
--- a/src/b4/__init__.py
+++ b/src/b4/__init__.py
@@ -3896,6 +3896,8 @@ def get_main_config() -> ConfigDictT:
 def get_data_dir(appname: str = 'b4') -> str:
     if 'XDG_DATA_HOME' in os.environ:
         datahome = os.environ['XDG_DATA_HOME']
+    elif sys.platform == 'win32':
+        datahome = os.environ.get('APPDATA', str(pathlib.Path.home() / 'AppData' / 'Roaming'))
     else:
         datahome = os.path.join(str(pathlib.Path.home()), '.local', 'share')
     datadir = os.path.join(datahome, appname)
@@ -3907,6 +3909,8 @@ def get_cache_dir(appname: str = 'b4') -> str:
     global _CACHE_CLEANED
     if 'XDG_CACHE_HOME' in os.environ:
         cachehome = os.environ['XDG_CACHE_HOME']
+    elif sys.platform == 'win32':
+        cachehome = os.environ.get('LOCALAPPDATA', str(pathlib.Path.home() / 'AppData' / 'Local'))
     else:
         cachehome = os.path.join(str(pathlib.Path.home()), '.cache')
     cachedir = os.path.join(cachehome, appname)
-- 
2.45.0.windows.1