Hooks才是Claude Code CLI 的革命性更新 --知识铺

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{ "hooks": { "EventName": [ { "matcher": "ToolPattern", "hooks": [ { "type": "command", "command": "your-command-here", "timeout": 100 } ] } ] } }

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{ "hooks": { "PreToolUse": [ { "matcher": "Bash", "hooks": [ { "type": "command", "command": "jq -r '\"\\(.tool_input.command) - \\(.tool_input.description // \"No description\")\"' >> ~/.claude/bash-command-log.txt" } ] } ] } }

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{ "hooks": { "PostToolUse": [ { "matcher": "Edit|MultiEdit|Write", "hooks": [ { "type": "command", "command": "jq -r '.tool_input.file_path' | { read file_path; if echo \"$file_path\" | grep -q '\\.ts$'; then npx prettier --write \"$file_path\"; fi; }" } ] } ] } }

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{ "hooks": { "UserPromptSubmit": [ { "hooks": [ { "type": "command", "command": "sh ./hello.sh" } ] } ] } }

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{ "hooks": { "PostToolUse": [ { "matcher": "Write|Edit", "hooks": [ { "type": "command", "command": "sh $CLAUDE_PROJECT_DIR/.claude/hooks/hello.sh" } ] } ] } }

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{ "hooks": { "UserPromptSubmit": [ { "hooks": [ { "type": "command", "command": "python $CLAUDE_PROJECT_DIR/.claude/hooks/hooks_input.py" } ] } ] } }

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{ "hooks": { "PostToolUse": [ { "hooks": [ { "type": "command", "command": "ruby $CLAUDE_PROJECT_DIR/.claude/hooks/hooks_input.rb" } ] } ] } }

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{ "hooks": { "UserPromptSubmit": [ { "hooks": [ { "type": "command", "command": "osascript -e 'display notification \"Awaiting your input\" with title \"Claude Code\" sound name \"default\"'" } ] } ] } }

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{ "hooks": { "PreToolUse": [ { "matcher": "Edit|MultiEdit|Write", "hooks": [ { "type": "command", "command": "python -c \"import json, sys; data=json.load(sys.stdin); path=data.get('tool_input',{}).get('file_path',''); sys.exit(2 if any(p in path for p in ['.env', 'package-lock.json', '.git/']) else 0)\"" } ] } ] } }

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#!/usr/bin/env python3 import json import sys import re import datetime # Load input from stdin try: input_data = json.load(sys.stdin) except json.JSONDecodeError as e: print(f"Error: Invalid JSON input: {e}", file=sys.stderr) sys.exit(1) prompt = input_data.get("prompt", "") # Check for sensitive patterns sensitive_patterns = [ (r"(?i)\b(password|secret|key|token)\s*[:=]", "Prompt contains potential secrets"), ] for pattern, message in sensitive_patterns: if re.search(pattern, prompt): # Use JSON output to block with a specific reason output = { "decision": "block", "reason": f"Security policy violation: {message}. Please rephrase your request without sensitive information." } print(json.dumps(output)) sys.exit(0) # Add current time to context context = f"Current time: {datetime.datetime.now()}" print(context) """ The following is also equivalent: print(json.dumps({ "hookSpecificOutput": { "hookEventName": "UserPromptSubmit", "additionalContext": context, }, })) """ # Allow the prompt to proceed with the additional context sys.exit(0)

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{ "hooks": { "UserPromptSubmit": [ { "hooks": [ { "type": "command", "command": "python $CLAUDE_PROJECT_DIR/.claude/hooks/sensitive_prompt.py" } ] } ] } }

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#!/usr/bin/env python3 """ Markdown formatter for Claude Code output. Fixes missing language tags and spacing issues while preserving code content. """ import json import sys import re import os def detect_language(code): """Best-effort language detection from code content.""" s = code.strip() # JSON detection if re.search(r'^\s*[{\[]', s): try: json.loads(s) return 'json' except: pass # Python detection if re.search(r'^\s*def\s+\w+\s*\(', s, re.M) or \ re.search(r'^\s*(import|from)\s+\w+', s, re.M): return 'python' # JavaScript detection if re.search(r'\b(function\s+\w+\s*\(|const\s+\w+\s*=)', s) or \ re.search(r'=>|console\.(log|error)', s): return 'javascript' # Bash detection if re.search(r'^#!.*\b(bash|sh)\b', s, re.M) or \ re.search(r'\b(if|then|fi|for|in|do|done)\b', s): return 'bash' # SQL detection if re.search(r'\b(SELECT|INSERT|UPDATE|DELETE|CREATE)\s+', s, re.I): return 'sql' return 'text' def format_markdown(content): """Format markdown content with language detection.""" # Fix unlabeled code fences def add_lang_to_fence(match): indent, info, body, closing = match.groups() if not info.strip(): lang = detect_language(body) return f"{indent}```{lang}\n{body}{closing}\n" return match.group(0) fence_pattern = r'(?ms)^([ \t]{0,3})```([^\n]*)\n(.*?)(\n\1```)\s*$' content = re.sub(fence_pattern, add_lang_to_fence, content) # Fix excessive blank lines (only outside code fences) content = re.sub(r'\n{3,}', '\n\n', content) return content.rstrip() + '\n' # Main execution try: input_data = json.load(sys.stdin) file_path = input_data.get('tool_input', {}).get('file_path', '') if not file_path.endswith(('.md', '.mdx')): sys.exit(0) # Not a markdown file if os.path.exists(file_path): with open(file_path, 'r', encoding='utf-8') as f: content = f.read() formatted = format_markdown(content) if formatted != content: with open(file_path, 'w', encoding='utf-8') as f: f.write(formatted) print(f"✓ Fixed markdown formatting in {file_path}") except Exception as e: print(f"Error formatting markdown: {e}", file=sys.stderr) sys.exit(1)

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{ "hooks": { "PostToolUse": [ { "matcher": "Edit|MultiEdit|Write", "hooks": [ { "type": "command", "command": "python $CLAUDE_PROJECT_DIR/.claude/hooks/markdown_formatter.py" } ] } ] } }

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#!/usr/bin/env python3 import json import sys # Load input from stdin try: input_data = json.load(sys.stdin) except json.JSONDecodeError as e: print(f"Error: Invalid JSON input: {e}", file=sys.stderr) sys.exit(1) tool_name = input_data.get("tool_name", "") tool_input = input_data.get("tool_input", {}) # Example: Auto-approve file reads for documentation files if tool_name == "Read": file_path = tool_input.get("file_path", "") if file_path.endswith((".md", ".mdx", ".txt", ".json")): # Use JSON output to auto-approve the tool call output = { "decision": "approve", "reason": "Documentation file auto-approved", "suppressOutput": True # Don't show in transcript mode } print(json.dumps(output)) sys.exit(0) # For other cases, let the normal permission flow proceed sys.exit(0)

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{ "hooks": { "PreToolUse": [ { "hooks": [ { "type": "command", "command": "python $CLAUDE_PROJECT_DIR/.claude/hooks/auto-approval.py" } ] } ] } }

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{ "hooks": { "PreToolUse": [ { "matcher": "mcp__context7__.*", "hooks": [ { "type": "command", "command": "echo 'context7 operation'" } ] }, { "matcher": "mcp__.*__write.*", "hooks": [ { "type": "command", "command": "echo 'mcp write'" } ] } ] } }