add dirs module to get toplevel flake and configuration dir

pkgs/clan-cli/clan_cli/dirs.py

@@ -0,0 +1,25 @@
+import os
+import sys
+from pathlib import Path
+
+
+def get_clan_flake_toplevel() -> Path:
+    """Returns the path to the toplevel of the clan flake"""
+    initial_path = Path(os.getcwd())
+    path = Path(initial_path)
+    while path.parent == path:
+        project_files = [".clan-flake"]
+        for project_file in project_files:
+            if (path / project_file).exists():
+                return path
+        path = path.parent
+    return initial_path
+
+
+def user_data_dir() -> Path:
+    if sys.platform == "win32":
+        raise NotImplementedError("Windows is not supported")
+    elif sys.platform == "darwin":
+        return Path(os.path.expanduser("~/Library/Application Support/"))
+    else:
+        return Path(os.getenv("XDG_DATA_HOME", os.path.expanduser("~/.local/share")))