Refactored for better config & cleaner debug mode

config.py

@@ -1,3 +1,8 @@
+# flake8: noqa: F821
+#* This file sets a number of config constants by modifying its own globals
+#* As a result, F821 is disabled as the intereter cannot be trusted to know
+#* when F821 should be raised.
+
 from pathlib import Path
 
 import tomllib
@@ -5,30 +10,57 @@ import tomllib
 import docker
 
 
-def get_config(config: str = "default") -> dict:
+CLIENT = docker.from_env(version="auto")
+
+type ConfigLabel = str | list[str]
+
+
+def get_config(config_label: ConfigLabel = ["default"]) -> dict:
+    if isinstance(config_label, str):
+        config_label = [config_label]
     with open("config.toml", "rb") as f:
         configs: dict = tomllib.load(f)
-    out_config: dict = configs["default"]
-    out_config.update(configs[config])
+    out_config: dict = {}
+    for c in config_label:
+        out_config.update(configs[c])
     return out_config
 
 
-def apply_config(config: dict) -> None:
-    config["CLIENT"] = docker.from_env(version="auto")
-    config["ROOT_DIR"] = Path(config["ROOT_DIR"]).absolute()
-    config["BUILD_DIR"] = Path(config["BUILD_DIR"]).absolute()
-    config["DOCKERFILE_DIR"] = Path(config["DOCKERFILE_DIR"]).absolute()
-    config["FUELIGNITION_BUILD_DIR"] = config["BUILD_DIR"] / config["FUELIGNITION_BUILD_DIR"]
-    config["CWD_MOUNTDIR"] = Path(config["CWD_MOUNTDIR"])
+def finalise_config(config: dict) -> None:
+    # First, convert base paths to Path objects
+    for k, v in config.items():
+        match k:
+            case "ROOT_DIR" | "BUILD_DIR" | "DOCKERFILE_DIR":
+                config[k] = Path(v).absolute()
+            case "CWD_MOUNTDIR":
+                config[k] = Path(v)
+    # Then, get required paths from config or globals if not present
+    build_dir = config.get("BUILD_DIR", BUILD_DIR)
+    cwd_mountdir = config.get("CWD_MOUNTDIR", CWD_MOUNTDIR)
+    root_dir = config.get("ROOT_DIR", ROOT_DIR)
+    # Finally, construct the secondary parameters
+    config["FUELIGNITION_BUILD_DIR"] = build_dir / config.get(
+        "FUELIGNITION_BUILD_DIR",
+        FUELIGNITION_BUILD_DIR
+    )
     config["CWD_MOUNT"] = docker.types.Mount(
-        target=str(config["CWD_MOUNTDIR"]),
-        source=str(config["ROOT_DIR"]),
+        target=str(cwd_mountdir),
+        source=str(root_dir),
         type="bind",
     )
+
+
+def apply_config(config: dict) -> None:
+    finalise_config(config)
     globals().update(config)
     
 
-def init(config: str = "default") -> None:
-    apply_config(get_config(config))
+def update_config(config_label: ConfigLabel = "default") -> None:
+    apply_config(get_config(config_label))
+
+
+def init() -> None:
+    globals().update(get_config())
+    update_config()
 
 init()