Read world config from TOML instead of hardcoding

src/mudlib/server.py

@@ -4,6 +4,7 @@ import asyncio
 import logging
 import pathlib
 import time
+import tomllib
 from typing import cast
 
 import telnetlib3
@@ -25,6 +26,14 @@ PORT = 6789
 _world: World | None = None
 
 
+def load_world_config(world_name: str = "earth") -> dict:
+    """Load world configuration from TOML file."""
+    worlds_dir = pathlib.Path(__file__).resolve().parents[2] / "worlds"
+    config_path = worlds_dir / world_name / "config.toml"
+    with open(config_path, "rb") as f:
+        return tomllib.load(f)
+
+
 def find_passable_start(world: World, start_x: int, start_y: int) -> tuple[int, int]:
     """Find a passable tile starting from (start_x, start_y) and searching outward.
 
@@ -139,9 +148,21 @@ async def run_server() -> None:
 
     # Generate world once at startup (cached to build/ after first run)
     cache_dir = pathlib.Path(__file__).resolve().parents[2] / "build"
-    log.info("loading world (seed=42, 1000x1000)...")
+    config = load_world_config()
+    world_cfg = config["world"]
+    log.info(
+        "loading world (seed=%d, %dx%d)...",
+        world_cfg["seed"],
+        world_cfg["width"],
+        world_cfg["height"],
+    )
     t0 = time.monotonic()
-    _world = World(seed=42, width=1000, height=1000, cache_dir=cache_dir)
+    _world = World(
+        seed=world_cfg["seed"],
+        width=world_cfg["width"],
+        height=world_cfg["height"],
+        cache_dir=cache_dir,
+    )
     elapsed = time.monotonic() - t0
     if _world.cached:
         log.info("world loaded from cache in %.2fs", elapsed)

tests/test_server.py

@@ -89,3 +89,17 @@ async def test_shell_handles_quit():
     calls = [str(call) for call in writer.write.call_args_list]
     assert any("Goodbye" in call for call in calls)
     writer.close.assert_called()
+
+
+def test_load_world_config():
+    """Config loader returns expected values from worlds/earth/config.toml."""
+    config = server.load_world_config()
+    assert config["world"]["seed"] == 42
+    assert config["world"]["width"] == 1000
+    assert config["world"]["height"] == 1000
+
+
+def test_load_world_config_missing():
+    """Config loader raises FileNotFoundError for nonexistent world."""
+    with pytest.raises(FileNotFoundError):
+        server.load_world_config("nonexistent")