diffscope 0.4.1

# DiffScope

A composable code review engine for automated diff analysis.

## Features

- **Model Agnostic**: Works with OpenAI, Anthropic Claude 4, Ollama, and any OpenAI-compatible API
- **Git Integration**: Review uncommitted, staged, or branch changes directly
- **PR Reviews**: Analyze and comment on GitHub pull requests
- **Smart Prompting**: Advanced prompt engineering with examples, XML structure, and chain-of-thought
- **Commit Messages**: AI-powered commit message suggestions following conventional commits
- **Composable Architecture**: Modular components that work together
- **Plugin System**: Extensible pre-analyzers and post-processors
- **Multiple Outputs**: JSON, patch, or markdown formats
- **CI/CD Ready**: GitHub Action, GitLab CI, and Docker support
- **Smart Review**: Enhanced analysis with confidence scoring, fix effort estimation, and executive summaries

## Quick Start

### Install via Homebrew (macOS/Linux)
```bash
brew tap haasonsaas/diffscope
brew install diffscope
```

### Install from crates.io
```bash
cargo install diffscope
```

### Docker
```bash
docker run --rm -v $(pwd):/workspace ghcr.io/haasonsaas/diffscope:latest review --diff /workspace/pr.diff
```

## Usage

### Basic Usage
```bash
# Review your current changes
git diff | diffscope review

# Review a specific file diff
diffscope review --diff patch.diff

# Get enhanced analysis with smart review
git diff | diffscope smart-review
```

### Git Integration
```bash
# Review what you're about to commit
diffscope git staged

# Review all uncommitted changes  
diffscope git uncommitted

# Compare your branch to main
diffscope git branch main

# Get AI-powered commit message suggestions
diffscope git suggest
```

### Pull Request Review
```bash
# Review the current PR
diffscope pr

# Review a specific PR number
diffscope pr --number 123

# Post review comments directly to GitHub
diffscope pr --post-comments
```

### Smart Review (Enhanced Analysis)
```bash
# Get professional-grade analysis with confidence scoring
git diff | diffscope smart-review

# Generate executive summary report
diffscope smart-review --diff changes.patch --output report.md

# Review with specific AI model
git diff | diffscope smart-review --model claude-3-5-sonnet-20241022
```

### AI Model Configuration
```bash
# OpenAI (default)
export OPENAI_API_KEY=your-key
git diff | diffscope review --model gpt-4o

# Anthropic Claude
export ANTHROPIC_API_KEY=your-key  
git diff | diffscope review --model claude-3-5-sonnet-20241022

# Local Ollama
git diff | diffscope review --model ollama:codellama
```

### Supported Models

**OpenAI**: gpt-4o, gpt-4-turbo, gpt-3.5-turbo

**Anthropic**: 
- Claude 4: claude-opus-4-20250514, claude-sonnet-4-20250514
- Claude 3.5: claude-3-5-sonnet-20241022, claude-3-5-haiku-20240307
- Claude 3: claude-3-opus-20240229, claude-3-haiku-20240307

**Ollama**: Any locally installed model (codellama, llama3.2, mistral, etc.)

### Output Formats
```bash
# JSON output (default)
git diff | diffscope review --output-format json

# Markdown report  
git diff | diffscope review --output-format markdown > review.md

# Inline patch comments
git diff | diffscope review --output-format patch
```

## GitHub Action

```yaml
name: AI Code Review
on: [pull_request]

jobs:
  review:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - uses: haasonsaas/diffscope@v1
        with:
          model: gpt-4o
          openai-api-key: ${{ secrets.OPENAI_API_KEY }}
          post-comments: true
```

## Configuration

Create a `.diffscope.yml` file in your repository:

```yaml
model: gpt-4o
temperature: 0.2
max_tokens: 4000
system_prompt: "Focus on security vulnerabilities, performance issues, and best practices"
```

## Plugin Development

Create custom analyzers:

```typescript
export interface PreAnalyzer {
  id: string
  run(diff: UnifiedDiff, repoPath: string): Promise<LLMContextChunk[]>
}

export interface PostProcessor {
  id: string
  run(comments: Comment[], repoPath: string): Promise<Comment[]>
}
```

## Architecture

```mermaid
graph LR
  A[git diff] --> B(core-engine)
  subgraph core-engine
    B1[Diff Parser]
    B2[Context Fetcher]
    B3[Prompt Builder]
    B4[LLM Adapter]
    B5[Comment Synthesizer]
  end
  B -->|JSON| C(output)
```

## License

Apache-2.0 License. See [LICENSE](LICENSE) for details.

## Example Output

### Standard Review
```json
[
  {
    "file_path": "src/auth.py",
    "line_number": 42,
    "content": "Potential SQL injection vulnerability",
    "severity": "Error",
    "category": "Security",
    "suggestion": "Use parameterized queries instead of string interpolation"
  }
]
```

### Smart Review Output
```markdown
# 🤖 Smart Review Analysis Results

## 📊 Executive Summary

🟡 **Code Quality Score:** 8.2/10
📝 **Total Issues Found:** 4
🚨 **Critical Issues:** 1
📁 **Files Analyzed:** 3

### 🎯 Priority Actions
1. Address 1 security issue(s) immediately
2. Consider performance optimization for database queries

---

## 🔍 Detailed Analysis

### 🔴 Critical Issues (Fix Immediately)

#### 🔒 **src/auth.py:42** - 🔴 Significant Effort Security
**Confidence:** 95% | **Tags:** `security`, `sql`, `injection`

SQL injection vulnerability detected. User input is directly interpolated into query string without proper sanitization.

**💡 Recommended Fix:**
Use parameterized queries to prevent SQL injection attacks.

**🔧 Code Example:**
```diff
- query = f"SELECT * FROM users WHERE username='{username}'"
+ query = "SELECT * FROM users WHERE username=%s"
+ cursor.execute(query, (username,))
```

### 🟡 High Priority Issues

#### ⚡ **src/models.py:28** - 🟡 Moderate Effort Performance
**Confidence:** 87% | **Tags:** `performance`, `n+1-query`

N+1 query problem detected in user retrieval loop.

**💡 Recommended Fix:**
Use eager loading or bulk queries to reduce database calls.
```

### Commit Message Suggestion
```
feat(auth): add JWT-based authentication system
```

## Author

Jonathan Haas <jonathan@haas.holdings>

## Contributing

Contributions are welcome! Please open an issue first to discuss what you would like to change.

## Support

- GitHub Issues: [github.com/Haasonsaas/diffscope/issues](https://github.com/Haasonsaas/diffscope/issues)