Attempt at a harness

2024/aoc/days/__init__.py

@@ -0,0 +1,44 @@
+import importlib
+from abc import ABC, abstractmethod
+from typing import Any, Tuple, cast
+
+
+class Runner(ABC):
+    @classmethod
+    @abstractmethod
+    def run_both(cls, data: str) -> Tuple[Any, Any]:
+        pass
+
+    @classmethod
+    @abstractmethod
+    def part1(cls, data: str) -> Any:
+        pass
+
+    @classmethod
+    @abstractmethod
+    def part2(cls, data: str) -> Any:
+        pass
+
+
+class SeparateRunner(Runner):
+    @classmethod
+    def run_both(cls, data: str) -> Tuple[Any, Any]:
+        return (cls.part1(data), cls.part2(data))
+
+
+class CombinedRunner(Runner):
+    @classmethod
+    def part1(cls, data: str) -> Any:
+        return cls.run_both(data)[0]
+
+    @classmethod
+    def part2(cls, data: str) -> Any:
+        return cls.run_both(data)[1]
+
+
+def get_runner(day: int) -> type[Runner]:
+    runner_module = importlib.import_module(f".day{day}", package=__name__)
+
+    assert issubclass(runner_module.DayRunner, Runner)
+
+    return cast(type[Runner], runner_module.DayRunner)

2024/aoc/days/day1.py

@@ -0,0 +1,13 @@
+from typing import Any
+
+from . import SeparateRunner
+
+
+class DayRunner(SeparateRunner):
+    @classmethod
+    def part1(cls, _data: str) -> Any:
+        return "Hello"
+
+    @classmethod
+    def part2(cls, _data: str) -> Any:
+        return "world!"