new internal config incl. handling

src/pycage/config.py

@@ -0,0 +1,72 @@
+from __future__ import annotations
+
+import platform
+from pathlib import Path
+from typing import Any, Final
+
+from dopt_basics import configs, io
+
+from pycage.types import OsInfo
+
+
+class LazyConfigLoader:
+    def __init__(
+        self,
+        cfg_path: Path,
+    ) -> None:
+        if not cfg_path.exists():
+            raise FileNotFoundError(f"Config path does not seem to exist: {cfg_path}")
+
+        self.cfg_path = cfg_path
+        self._cfg: dict[str, Any] | None = None
+
+    def _load_config(self) -> None:
+        self._cfg = configs.load_toml(self.cfg_path)
+
+    def __getitem__(
+        self,
+        key: str,
+    ) -> Any:
+        if self._cfg is None:
+            self._load_config()
+
+        assert self._cfg is not None, "tried to access not loaded config"
+        return self._cfg[key]
+
+
+class PycageConfigLoader(LazyConfigLoader):
+    def __init__(
+        self,
+        cfg_path: Path,
+    ) -> None:
+        super().__init__(cfg_path)
+        self._os_info: OsInfo | None = None
+
+    @property
+    def os_info(self) -> OsInfo:
+        if self._os_info is None:
+            self._os_info = _parse_os_info(self)
+
+        return self._os_info
+
+
+def _parse_os_info(
+    cfg: PycageConfigLoader,
+) -> OsInfo:
+    system = platform.system()
+
+    os_file_info: OsInfo
+    match system:
+        case "Windows":
+            os_file_info = OsInfo(**cfg["platforms"]["win"])
+        case _:
+            raise NotImplementedError(f"Platform {system} not implemented yet.")
+
+    return os_file_info
+
+
+cfg_path = io.search_file_iterative(
+    Path(__file__), glob_pattern="config.toml", stop_folder_name="pycage"
+)
+assert cfg_path is not None, "static config path not found"
+CFG: Final[PycageConfigLoader] = PycageConfigLoader(cfg_path)

src/pycage/config.toml

@@ -0,0 +1,12 @@
+[metadata]
+URL = 'https://raw.githubusercontent.com/astral-sh/python-build-standalone/latest-release/latest-release.json'
+
+[package]
+PACKAGE_TYPE = 'install_only_stripped'
+
+[platforms]
+[platforms.win]
+PLATFORM = 'x86_64'
+OS = 'pc-windows-msvc'
+FILE_EXT = '.tar.gz'
+INTERPRETER = 'python.exe'