# Git Commit Analysis Examples

## Example 1: Feature Addition Commit

**User Request:**
"帮我分析下这个git提交的修改，要深度分析里面变更的代码内容，而不仅仅是commit 消息：abc123def"

**Analysis Output Structure:**

```markdown
# Git Commit 深度分析报告

## 提交信息
- **Commit Hash**: abc123def456...
- **作者**: developer
- **日期**: 2026-02-06
- **提交消息**: "添加用户认证功能"

## 变更概览
- `auth.py`: +150行 (新增认证模块)
- `routes.py`: +30行 (添加登录路由)
- `models.py`: +20行 (用户模型扩展)

## 核心变更详细分析

### 变更1: 用户认证模块
#### 📍 代码位置
`auth.py` 第 1-50 行（新文件）

#### 📝 变更前代码
[文件不存在]

#### 📝 变更后代码
```python
from flask_jwt_extended import JWTManager, create_access_token
from werkzeug.security import check_password_hash

class AuthService:
    def __init__(self):
        self.jwt = JWTManager()
    
    def authenticate(self, username, password):
        # 验证逻辑
        ...
```

#### 🔍 上下文代码
[相关依赖和配置]

#### 💡 变更原因和目的深度分析
1. **业务需求**: 需要保护API端点，防止未授权访问
2. **技术选择**: 使用JWT而非session，支持无状态API
3. **安全性**: 密码使用hash存储，token有过期机制
```

## Example 2: Bug Fix Commit

**User Request:**
"分析这个bug修复提交：xyz789"

**Analysis Focus:**
- What bug existed (symptoms, root cause)
- Why the fix works
- Edge cases handled
- Test coverage

## Example 3: Refactoring Commit

**User Request:**
"深度分析这个重构提交：refactor123"

**Analysis Focus:**
- What was refactored and why
- Code quality improvements
- Performance implications
- Breaking changes

## Example 4: Performance Optimization

**User Request:**
"分析这个性能优化提交：perf456"

**Analysis Focus:**
- Performance bottleneck identified
- Optimization technique used
- Before/after metrics
- Trade-offs made