runtests: Run pre-commit only on specified files (#11949)

Author: Avasam

tests/runtests.py

@@ -78,12 +78,12 @@ def main() -> None:
     if folder not in {"stdlib", "stubs"}:
         parser.error("Only the 'stdlib' and 'stubs' folders are supported.")
     if not os.path.exists(path):
-        parser.error(rf"'path' {path} does not exist.")
+        parser.error(f"{path=} does not exist.")
     stubtest_result: subprocess.CompletedProcess[bytes] | None = None
     pytype_result: subprocess.CompletedProcess[bytes] | None = None
 
     print("\nRunning pre-commit...")
-    pre_commit_result = subprocess.run(["pre-commit", "run", "--all-files"])
+    pre_commit_result = subprocess.run(["pre-commit", "run", "--files", *Path(path).rglob("*")])
 
     print("\nRunning check_typeshed_structure.py...")
     check_structure_result = subprocess.run([sys.executable, "tests/check_typeshed_structure.py"])