Script polish

examples/hooks/bash_command_validator_example.py

@@ -18,7 +18,7 @@ Make sure to change your path to your actual script.
         "hooks": [
           {
             "type": "command",
-            "command": "python -m ./bash_command_validator_example"
+            "command": "python3 /path/to/claude-code/examples/hooks/bash_command_validator_example.py"
           }
         ]
       }
@@ -33,21 +33,21 @@ import re
 import sys
 
 # Define validation rules as a list of (regex pattern, message) tuples
-VALIDATION_RULES = [
+_VALIDATION_RULES = [
     (
-        r"\bgrep\b(?!.*\|)",
+        r"^grep\b(?!.*\|)",
         "Use 'rg' (ripgrep) instead of 'grep' for better performance and features",
     ),
     (
-        r"\bfind\s+\S+\s+-name\b",
+        r"^find\s+\S+\s+-name\b",
         "Use 'rg --files | rg pattern' or 'rg --files -g pattern' instead of 'find -name' for better performance",
     ),
 ]
 
 
-def validate_command(command: str) -> list[str]:
+def _validate_command(command: str) -> list[str]:
     issues = []
-    for pattern, message in VALIDATION_RULES:
+    for pattern, message in _VALIDATION_RULES:
         if re.search(pattern, command):
             issues.append(message)
     return issues
@@ -58,6 +58,7 @@ def main():
         input_data = json.load(sys.stdin)
     except json.JSONDecodeError as e:
         print(f"Error: Invalid JSON input: {e}", file=sys.stderr)
+        # Exit code 1 shows stderr to the user but not to Claude
         sys.exit(1)
 
     tool_name = input_data.get("tool_name", "")
@@ -70,9 +71,7 @@ def main():
     if not command:
         sys.exit(0)
 
-    # Validate the command
-    issues = validate_command(command)
-
+    issues = _validate_command(command)
     if issues:
         for message in issues:
             print(f"• {message}", file=sys.stderr)