refactor: code cleanup

Author: shenxianpeng

cpp_linter_hooks/clang_format.py

@@ -3,7 +3,7 @@
 from argparse import ArgumentParser
 from typing import Tuple
 
-from .util import ensure_installed, DEFAULT_CLANG_FORMAT_VERSION
+from .util import _install_tool, DEFAULT_CLANG_FORMAT_VERSION
 
 
 parser = ArgumentParser()
@@ -15,7 +15,8 @@
 
 def run_clang_format(args=None) -> Tuple[int, str]:
     hook_args, other_args = parser.parse_known_args(args)
-    ensure_installed("clang-format", hook_args.version)
+    if hook_args.version is not None:
+        _install_tool("clang-format", hook_args.version)
     command = ["clang-format", "-i"]
 
     # Add verbose flag if requested