Update algo selection pre-commit hook from within Python (#589)

Author: timmens

.pre-commit-config.yaml

@@ -22,10 +22,9 @@ repos:
     hooks:
       - id: update-algo-selection-code
         name: update algo selection code
-        entry: bash .tools/create_and_format_algo_selection_code.sh
+        entry: python .tools/update_algo_selection_hook.py
         language: python
-        files: (src/optimagic/optimizers/.|src/optimagic/algorithms.py|.tools/.)
-        always_run: false
+        files: ^(src/optimagic/optimizers/|src/optimagic/algorithms\.py|\.tools/)
         require_serial: true
         additional_dependencies:
           - hatchling

.tools/create_and_format_algo_selection_code.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env python
+import subprocess
+import sys
+from pathlib import Path
+from typing import Any
+
+ROOT = Path(__file__).resolve().parents[1]
+
+# sys.executable guarantees we stay inside the pre‑commit venv
+PYTHON = [sys.executable]
+# "-m" lets us call std‑lib modules (e.g. pip) the same way
+PYTHON_MINUS_M = [*PYTHON, "-m"]
+
+
+def run(cmd: list[str], **kwargs: Any) -> None:
+    subprocess.check_call(cmd, cwd=ROOT, **kwargs)
+
+
+def ensure_optimagic_is_locally_installed() -> None:
+    try:
+        run(PYTHON_MINUS_M + ["pip", "show", "optimagic"], stdout=subprocess.DEVNULL)
+    except subprocess.CalledProcessError:
+        run(PYTHON_MINUS_M + ["pip", "install", "-e", "."])
+
+
+def main() -> int:
+    ensure_optimagic_is_locally_installed()
+    run(PYTHON + [".tools/create_algo_selection_code.py"])
+
+    ruff_args = [
+        "--silent",
+        "--config",
+        "pyproject.toml",
+        "src/optimagic/algorithms.py",
+    ]
+    run(["ruff", "format", *ruff_args])
+    run(["ruff", "check", "--fix", *ruff_args])
+    return 0  # explicit success code
+
+
+if __name__ == "__main__":
+    sys.exit(main())