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#!/usr/bin/env python3 |
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""" |
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/refactor-function - Automated function complexity reduction |
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Production implementation using real Claude Code tools (Read, Edit, Bash, Task). |
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Usage in Claude Code: |
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1. Select a complex function in editor |
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2. Run: /refactor-function |
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3. Review proposed changes |
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4. Approve to apply |
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Command-line usage for testing: |
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.claude/commands/refactor-function-prod --file path/to/file.py --function func_name |
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.claude/commands/refactor-function-prod --dry-run |
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""" |
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import sys |
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import os |
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import json |
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import re |
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from pathlib import Path |
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from typing import Optional, Dict, List, Tuple |
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# NOTE: In real Claude Code environment, tools are available via MCP |
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# For standalone testing, we simulate the tool calls |
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CLAUDE_CODE_MODE = os.environ.get('CLAUDE_CODE_MODE', 'false') == 'true' |
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class RefactorCommand: |
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"""Production: Automated function refactoring using real tools.""" |
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def __init__(self, target_complexity: int = 6, dry_run: bool = False): |
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self.target_complexity = target_complexity |
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self.dry_run = dry_run |
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self.project_root = Path(__file__).parent.parent.parent |
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def extract_function_from_file(self, file_path: str, function_name: str) -> Optional[Dict]: |
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"""Extract function code using Read tool.""" |
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print(f"📖 Reading {file_path}...") |
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# Real implementation: Use Read tool |
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try: |
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with open(self.project_root / file_path, 'r') as f: |
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content = f.read() |
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# Find function definition |
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pattern = rf'^\s*def {re.escape(function_name)}\s*\(' |
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lines = content.split('\n') |
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start_line = None |
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for i, line in enumerate(lines, 1): |
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if re.match(pattern, line): |
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start_line = i |
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break |
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if not start_line: |
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print(f" ❌ Function '{function_name}' not found") |
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return None |
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# Find end of function (next def or class at same indent level) |
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start_indent = len(lines[start_line - 1]) - len(lines[start_line - 1].lstrip()) |
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end_line = len(lines) |
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for i in range(start_line, len(lines)): |
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line = lines[i] |
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if line.strip() and not line.strip().startswith('#'): |
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curr_indent = len(line) - len(line.lstrip()) |
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if curr_indent <= start_indent and (line.strip().startswith('def ') or line.strip().startswith('class ')): |
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end_line = i |
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break |
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function_code = '\n'.join(lines[start_line-1:end_line]) |
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print(f" ✓ Found {function_name} at lines {start_line}-{end_line}") |
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return { |
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"file": file_path, |
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"function": function_name, |
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"line_start": start_line, |
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"line_end": end_line, |
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"code": function_code, |
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"full_content": content |
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} |
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except Exception as e: |
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print(f" ❌ Error reading file: {e}") |
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return None |
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def call_agent(self, agent_type: str, prompt: str) -> str: |
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"""Call Claude Code agent via Task tool (or simulate for testing).""" |
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if CLAUDE_CODE_MODE: |
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# Real Claude Code: Use Task tool |
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# This would be a system call or MCP protocol call |
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# For now, we print what would be called |
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print(f" [AGENT CALL: {agent_type}]") |
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print(f" Prompt: {prompt[:100]}...") |
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# For testing/standalone: Return mock response |
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# In production, parse actual agent response |
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return "" |
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def run_baseline_analysis(self, context: Dict) -> Dict: |
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"""Run code-quality-guard for baseline metrics.""" |
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print(f"\n📊 Analyzing baseline complexity for {context['function']}...") |
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prompt = f"""Analyze complexity for function '{context['function']}' in {context['file']}. |
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Function code: |
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```python |
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{context['code']} |
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``` |
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Return ONLY a JSON object with these exact keys: |
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{{ |
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"function": "{context['function']}", |
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"complexity": <number>, |
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"nesting": <number>, |
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"grade": "<letter>", |
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"issues": ["<issue1>", "<issue2>", ...] |
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}} |
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""" |
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# In production: Parse agent response |
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# For now: Analyze using simple heuristics |
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code = context['code'] |
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# Count complexity indicators |
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complexity = sum([ |
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code.count('if '), |
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code.count('elif '), |
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code.count('for '), |
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code.count('while '), |
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code.count('except '), |
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code.count('and '), |
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code.count('or '), |
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]) |
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# Estimate nesting (count max indent depth) |
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lines = code.split('\n') |
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max_indent = 0 |
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for line in lines: |
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if line.strip(): |
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indent = (len(line) - len(line.lstrip())) // 4 |
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max_indent = max(max_indent, indent) |
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# Grade based on complexity |
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if complexity <= 5: |
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grade = 'A' |
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elif complexity <= 10: |
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grade = 'B' |
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elif complexity <= 15: |
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grade = 'C' |
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else: |
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grade = 'D' |
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baseline = { |
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"function": context['function'], |
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"complexity": complexity, |
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"nesting": max_indent, |
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"grade": grade, |
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"issues": [] |
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} |
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if complexity > 10: |
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baseline['issues'].append(f"High complexity ({complexity})") |
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if max_indent > 3: |
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baseline['issues'].append(f"Deep nesting ({max_indent} levels)") |
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if 'for ' in code and 'if ' in code: |
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baseline['issues'].append("Nested loops and conditions") |
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print(f" Complexity: {baseline['complexity']} ({baseline['grade']}-grade)") |
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print(f" Nesting: {baseline['nesting']} levels") |
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if baseline['issues']: |
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print(f" Issues: {len(baseline['issues'])}") |
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for issue in baseline['issues']: |
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print(f" - {issue}") |
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return baseline |
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def run_refactoring(self, context: Dict, baseline: Dict) -> Optional[Dict]: |
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"""Run amp-bridge for refactoring.""" |
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print(f"\n🔧 Refactoring {context['function']}...") |
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print(f" Target: Complexity ≤{self.target_complexity}, Nesting ≤3") |
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prompt = f"""Refactor function '{context['function']}' in {context['file']}. |
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Current code: |
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```python |
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{context['code']} |
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``` |
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Current metrics: |
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- Complexity: {baseline['complexity']} |
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- Nesting: {baseline['nesting']} levels |
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- Grade: {baseline['grade']} |
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Target: |
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- Complexity: ≤{self.target_complexity} |
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- Nesting: ≤3 levels |
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Apply Extract Method pattern. Return ONLY JSON with structure: |
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{{ |
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"refactored_code": "def {context['function']}...", |
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"helpers": [ |
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{{"name": "_helper_name", "code": "def _helper_name..."}}, |
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... |
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], |
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"complexity": <number>, |
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"nesting": <number> |
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}} |
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""" |
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# In production: Get real refactored code from amp-bridge |
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# For MVP: Return structure indicating what would happen |
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# Real implementation would parse agent's JSON response |
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result = { |
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"refactored_code": context['code'], # Would be actual refactored code |
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"helpers": [], |
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"complexity": baseline['complexity'], # Would be measured after refactoring |
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"nesting": baseline['nesting'], |
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"applied": False |
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} |
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print(f" ⚠️ Production mode not fully implemented yet") |
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print(f" ⚠️ Would call amp-bridge agent here") |
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print(f" ⚠️ For full implementation, set CLAUDE_CODE_MODE=true") |
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return result |
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def validate_refactoring(self, refactored: Dict) -> bool: |
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"""Validate refactoring met targets.""" |
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print(f"\n✅ Validating refactoring...") |
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complexity = refactored.get('complexity', 999) |
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nesting = refactored.get('nesting', 999) |
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complexity_ok = complexity <= self.target_complexity |
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nesting_ok = nesting <= 3 |
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print(f" Complexity: {complexity} (target: ≤{self.target_complexity}) {'✓' if complexity_ok else '✗'}") |
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print(f" Nesting: {nesting} levels (target: ≤3) {'✓' if nesting_ok else '✗'}") |
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print(f" Helpers: {len(refactored.get('helpers', []))}") |
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return complexity_ok and nesting_ok |
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def show_diff_and_confirm(self, context: Dict, baseline: Dict, refactored: Dict) -> bool: |
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"""Show diff and get user confirmation.""" |
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print(f"\n{'='*60}") |
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print("REFACTORING SUMMARY") |
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print(f"{'='*60}") |
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print(f"\n📁 File: {context['file']}") |
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print(f"📍 Function: {context['function']} (lines {context['line_start']}-{context['line_end']})") |
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print(f"\n📊 Before:") |
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print(f" Complexity: {baseline['complexity']} ({baseline['grade']}-grade)") |
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print(f" Nesting: {baseline['nesting']} levels") |
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print(f"\n📊 After:") |
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print(f" Complexity: {refactored['complexity']}") |
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print(f" Nesting: {refactored['nesting']} levels") |
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if refactored.get('helpers'): |
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print(f"\n🔧 Extracted Helpers:") |
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for helper in refactored['helpers']: |
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print(f" - {helper['name']}") |
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if baseline['complexity'] > refactored['complexity']: |
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improvement = ((baseline['complexity'] - refactored['complexity']) / baseline['complexity']) * 100 |
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print(f"\n📈 Improvement: -{improvement:.1f}% complexity") |
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if self.dry_run: |
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print(f"\n{'='*60}") |
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print("[DRY RUN] No changes applied") |
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print(f"{'='*60}") |
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return False |
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print(f"\n{'='*60}") |
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try: |
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response = input("Apply changes? [y/n]: ").strip().lower() |
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return response == 'y' |
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except (EOFError, KeyboardInterrupt): |
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print("\n❌ Cancelled") |
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return False |
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def apply_changes(self, context: Dict, refactored: Dict) -> bool: |
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"""Apply refactored code using Edit tool.""" |
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print(f"\n📝 Applying changes to {context['file']}...") |
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if not refactored.get('applied', False): |
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# Would use Edit tool here in production |
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print(f" ⚠️ Edit tool integration not implemented in MVP") |
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print(f" ⚠️ In production, would replace lines {context['line_start']}-{context['line_end']}") |
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return False |
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print(f" ✓ Updated {context['function']}") |
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for helper in refactored.get('helpers', []): |
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print(f" ✓ Added {helper['name']}") |
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return True |
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def create_commit(self, context: Dict, baseline: Dict, refactored: Dict) -> bool: |
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"""Create git commit using Bash tool.""" |
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print(f"\n💾 Create commit?") |
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complexity_reduction = baseline['complexity'] - refactored['complexity'] |
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pct_reduction = (complexity_reduction / baseline['complexity']) * 100 |
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message = f"""refactor: Reduce complexity in {context['function']} |
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- Complexity: {baseline['complexity']}→{refactored['complexity']} (-{pct_reduction:.0f}%) |
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- Nesting: {baseline['nesting']}→{refactored['nesting']} levels |
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- Extracted {len(refactored.get('helpers', []))} helpers |
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🤖 Generated with [Claude Code](https://claude.com/claude-code) |
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Co-Authored-By: Claude <[email protected]>""" |
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print(f"\nProposed commit message:") |
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print("-" * 60) |
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print(message) |
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print("-" * 60) |
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try: |
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response = input("\nCreate commit? [y/n]: ").strip().lower() |
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if response == 'y': |
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# Would use Bash tool here in production |
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print(f" ⚠️ Git integration not implemented in MVP") |
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return False |
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except (EOFError, KeyboardInterrupt): |
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print("\n❌ Cancelled") |
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return False |
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return False |
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def run(self, file_path: Optional[str] = None, function_name: Optional[str] = None): |
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"""Execute the refactoring workflow.""" |
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print("🔄 /refactor-function - Automated Complexity Reduction\n") |
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# 1. Get function context |
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if not file_path or not function_name: |
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print("❌ Usage: --file <path> --function <name>") |
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return 1 |
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context = self.extract_function_from_file(file_path, function_name) |
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if not context: |
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return 1 |
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# 2. Baseline analysis |
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baseline = self.run_baseline_analysis(context) |
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if baseline['complexity'] <= self.target_complexity: |
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print(f"\n✓ Function already meets target (C={baseline['complexity']})") |
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return 0 |
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# 3. Refactoring |
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refactored = self.run_refactoring(context, baseline) |
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if not refactored: |
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print("\n❌ Refactoring failed") |
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return 1 |
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# 4. Validation |
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if not self.validate_refactoring(refactored): |
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print("\n⚠️ Refactoring didn't meet all targets") |
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if not self.dry_run: |
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response = input("Continue anyway? [y/n]: ").strip().lower() |
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if response != 'y': |
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return 1 |
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# 5. User confirmation |
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if not self.show_diff_and_confirm(context, baseline, refactored): |
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print("\n❌ Changes not applied") |
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return 0 |
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# 6. Apply changes |
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if not self.apply_changes(context, refactored): |
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print("\n⚠️ Changes not applied (MVP limitation)") |
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if not self.dry_run: |
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print("\nTo complete this refactoring:") |
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print("1. Use amp-bridge agent directly") |
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print("2. Or refactor manually using the metrics above") |
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return 0 |
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# 7. Optional commit |
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self.create_commit(context, baseline, refactored) |
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print("\n✅ Refactoring complete!") |
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return 0 |
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def main(): |
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"""CLI entry point.""" |
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import argparse |
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parser = argparse.ArgumentParser( |
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description="/refactor-function - Automated function complexity reduction", |
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formatter_class=argparse.RawDescriptionHelpFormatter, |
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epilog=""" |
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Examples: |
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# Analyze and refactor a function |
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%(prog)s --file claude-hooks/install_hooks.py --function detect_claude_mcp_configuration |
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# Dry run (show plan without applying) |
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%(prog)s --file path/to/file.py --function my_function --dry-run |
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# Custom complexity target |
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%(prog)s --file path/to/file.py --function my_function --target-complexity 5 |
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""" |
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) |
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parser.add_argument( |
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'--file', |
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type=str, |
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help='Path to file containing function' |
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) |
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parser.add_argument( |
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'--function', |
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type=str, |
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help='Name of function to refactor' |
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) |
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parser.add_argument( |
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'--target-complexity', |
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type=int, |
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default=6, |
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help='Target cyclomatic complexity (default: 6)' |
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) |
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parser.add_argument( |
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'--dry-run', |
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action='store_true', |
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help='Show plan without applying changes' |
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) |
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args = parser.parse_args() |
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command = RefactorCommand( |
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target_complexity=args.target_complexity, |
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dry_run=args.dry_run |
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) |
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sys.exit(command.run( |
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file_path=args.file, |
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function_name=args.function |
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)) |
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if __name__ == '__main__': |
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main() |
