# LeIndex

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[![MCP Server](https://img.shields.io/badge/MCP-Server-blue?style=for-the-badge)](https://modelcontextprotocol.io)
[![Python](https://img.shields.io/badge/Python-3.10%2B-green?style=for-the-badge)](https://www.python.org/)
[![License](https://img.shields.io/badge/License-MIT-yellow?style=for-the-badge)](LICENSE)
[![Version](https://img.shields.io/badge/Version-2.0.2-blue?style=for-the-badge)](CHANGELOG.md)

**AI-Powered Code Search That Actually Understands Your Code**

*Lightning-fast semantic code search with zero dependencies. Find code by meaning, not just by matching text.*

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---

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<img src="leindex.jpeg" alt="LeIndex Architecture" width="800">

*The LeIndex experience - powerful, fast, and beautiful*

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---

## ✨ What Makes LeIndex Special?

**LeIndex** isn't just another code search tool. It's your intelligent code companion that understands **what** you're looking for, not just **where** it might be typed.

Imagine searching for "authentication flow" and finding not just files containing those words, but the actual authentication logic, login handlers, session management, and security patterns - even if they're named completely differently. That's the magic of semantic search! 🎯

---

## 🚀 Quick Start (You'll Be Searching in Under 2 Minutes. It's Easier Than Making Coffee!)


## One-Click Installation

**The easiest way to get started:**

### Requirements
- Python 3.10 or higher
- 4GB RAM minimum (8GB+ for large codebases)
- About 1GB disk space

**Linux/Unix:**
```bash
curl -sSL https://raw.githubusercontent.com/scooter-lacroix/LeIndex/master/install.sh | bash
```

**macOS:**
```bash
curl -sSL https://raw.githubusercontent.com/scooter-lacroix/LeIndex/master/install_macos.sh | bash
```

**Windows:**
```powershell
irm https://raw.githubusercontent.com/scooter-lacroix/LeIndex/master/install.ps1 | iex
```

That's it. The installer will:
- ✅ Install LeIndex MCP server
- ✅ Detect your AI tools (Claude Code, Cursor, etc.)
- ✅ Configure integrations automatically
- ✅ Install optional skills for enhanced workflows

**Manual installation?** See below ↓

---

```bash
# Install LeIndex - seriously, that's it
pip install leindex

# Index your codebase (no Docker, no databases, no headache)
leindex init /path/to/your/project
leindex index /path/to/your/project

# Search like a wizard
leindex-search "authentication logic"

# Or use it via MCP in Claude, Cursor, or your favorite AI assistant
# LeIndex MCP server does the heavy lifting automatically!
```

OR

### PIP Install

```bash
pip install leindex
```

**That's literally it.** No Docker. No databases. No configuration files (unless you want them). Just works. ✨

### Verify It's Alive

```bash
leindex --version
# Output: LeIndex 2.0.2 - Ready to search! 🚀
```

### Install from Source (For the Adventurous)

```bash
git clone https://github.com/scooter-lacroix/leindex.git
cd leindex
pip install -e .
```

**Boom!** You're now searching your codebase at the speed of thought. 🎉

---

## 🎯 Why Developers Love LeIndex

### 🔥 Zero Dependencies, Zero Drama
- **No Docker** - Your laptop will thank you
- **No PostgreSQL** - No database setup nightmares
- **No Elasticsearch** - No Java memory leaks
- **No RabbitMQ** - No message queue complexity
- **Just pure Python magic** - `pip install` and you're done

### ⚡ Blazing Fast Performance
- **LEANN vector search** - Find similar code in milliseconds
- **Tantivy full-text search** - Rust-powered Lucene goodness
- **Hybrid scoring** - Best of both worlds: semantic + lexical
- **Handles 100K+ files** - Scale from side projects to monorepos

### 🧠 Semantic Understanding
- **CodeRankEmbed embeddings** - Understands code meaning and intent
- **Finds by concept** - Search "error handling" and find try/except, error types, logging, and recovery patterns
- **Smart symbol search** - Jump to definitions and references instantly
- **Regex power** - For when you need precise pattern matching

### 🏠 Privacy-First & Self-Hosted
- **Your code stays yours** - Nothing leaves your machine
- **Works offline** - No internet required after installation
- **No telemetry** - We don't track your searches
- **Enterprise-ready** - Deploy on your own infrastructure

### 🤖 MCP-Native Design
- **First-class MCP support** - Built from the ground up for Model Context Protocol
- **AI assistant ready** - Works seamlessly with Claude, Cursor, Windsurf, and more
- **Token efficient** - Saves ~200 tokens per session (no hook overhead!)
- **Optional skill integration** - For complex multi-project workflows

---

## 🎪 The LeIndex Magic Show

### 🔍 Search That Reads Your Mind

```python
# Search semantically
results = indexer.search("authentication flow")

# Get results that actually make sense:
# - Login handlers (even if named 'sign_in')
# - Session management (even if called 'user_state')
# - JWT verification (even if labeled 'token_check')
# - Password hashing (even if in 'crypto_utils')
```

### 📊 The Secret Sauce (Technology Stack)

| Component | Technology | Superpower |
|-----------|------------|------------|
| **Vector Search** | [LEANN](https://github.com/lerp-cli/leann) | Storage-efficient semantic similarity |
| **Code Brain** | [CodeRankEmbed](https://huggingface.co/nomic-ai/CodeRankEmbed) | Understands code meaning & intent |
| **Text Search** | [Tantivy](https://github.com/quickwit-oss/tantivy-py) | Rust-powered Lucene (fast!) |
| **Metadata** | [SQLite](https://www.sqlite.org/) | Reliable ACID-compliant storage |
| **Analytics** | [DuckDB](https://duckdb.org/) | In-memory analytical queries |
| **Async Engine** | asyncio | Built-in Python async (no RabbitMQ needed!) |

### 🏗️ Architecture That Makes Sense

```
┌─────────────────────────────────────────────────────────┐
│              The LeIndex Experience                     │
├─────────────────────────────────────────────────────────┤
│                                                         │
│  ┌──────────────┐     ┌─────────────┐     ┌───────────┐ │
│  │   MCP Server │◀─▶│ Core Engine │◀─▶│  LEANN    │ │
│  │  (Your AI    │     │ (The Brains)│     │ (Vectors) │ │
│  │   Assistant) │     │             │     │           │ │
│  └──────────────┘     └─────────────┘     └───────────┘ │
│         │                   │                    │      │
│         │                   ▼                    ▼      │
│         │            ┌──────────────┐     ┌───────────┐ │
│         │            │ Query Router │◀─▶│ Tantivy   │ │
│         │            │  (Traffic    │     │(Full-Text)│ │
│         │            │   Cop)       │     │           │ │
│         │            └──────────────┘     └───────────┘ │
│         │                   │                    │      │
│         ▼                   ▼                    ▼      │
│  ┌──────────────┐    ┌──────────────┐    ┌───────────┐  │
│  │ CLI Tools    │    │ Data Access  │    │  SQLite   │  │
│  │ (Power User) │    │    Layer     │    │ (Metadata)│  │
│  └──────────────┘    └──────────────┘    └───────────┘  │
│                              │                          │
│                              ▼                          │
│                       ┌──────────────┐                  │
│                       │   DuckDB     │                  │
│                       │ (Analytics)  │                  │
│                       └──────────────┘                  │
└─────────────────────────────────────────────────────────┘

💡 Everything runs locally. No cloud. No dependencies. Just speed.
```


## 🎯 Usage: Let's Search Some Code!

### 🤖 MCP Integration (The Cool Way)

LeIndex comes with a built-in MCP server that makes your AI assistant code-aware:

**Available MCP Superpowers:**
- `manage_project` - Set up and manage indexing for your projects
- `search_content` - Search code with semantic + full-text powers
- `get_diagnostics` - Get project stats and health checks

**Configuration in your MCP client (Claude, Cursor, etc.):**

```json
{
  "mcpServers": {
    "leindex": {
      "command": "leindex",
      "args": ["mcp"],
      "env": {}
    }
  }
}
```

**Start the MCP server:**
```bash
leindex mcp
```

Now your AI assistant can search your codebase like a pro! 🎉

**When to use what:**

| Approach | Best For |
|----------|----------|
| **MCP Tools** | Single-project searches, simple queries, direct API access |
| **Skills** | Multi-project operations, complex workflows, automated pipelines |

### 🐍 Python API (For the Coders)

```python
from leindex import LeIndex

# Initialize and index
indexer = LeIndex("~/my-awesome-project")
indexer.index()

# Search semantically - it understands meaning!
results = indexer.search("authentication flow")

# Filter like a boss
results = indexer.search(
    query="database connection",
    file_patterns=["*.py"],           # Only Python files
    exclude_patterns=["test_*.py"]     # But not tests
)

# Access the good stuff
for result in results:
    print(f"{result.file}:{result.line}")
    print(result.content)
    print(f"Relevance Score: {result.score}")
```

### 🔧 CLI Tools (For the Terminal Lovers)

```bash
# Initialize indexing for a project
leindex init /path/to/project

# Run the indexing (it's fast, we promise)
leindex index /path/to/project

# Search from terminal
leindex-search "authentication logic"

# Search with filters
leindex-search "database" --ext py --exclude test_*
```

---

## ⚙️ Configuration (Optional but Powerful)

LeIndex works great out of the box, but you can tweak it to your heart's content with `config.yaml`:

```yaml
# Data Access Layer (The Engine Room)
dal_settings:
  backend_type: "sqlite_duckdb"    # The good stuff
  db_path: "./data/leindex.db"     # Where metadata lives
  duckdb_db_path: "./data/leindex.db.duckdb"  # Analytics heaven

# Vector Store (Semantic Search Magic)
vector_store:
  backend_type: "leann"            # Storage-efficient vectors
  index_path: "./leann_index"      # Where vectors chill
  embedding_model: "nomic-ai/CodeRankEmbed"  # Code brain
  embedding_dim: 768               # Vector dimensions

# Async Processing (Speed Demon)
async_processing:
  enabled: true
  worker_count: 4                  # Parallel indexing
  max_queue_size: 10000            # Queue buffer

# File Filtering (Keep It Lean)
file_filtering:
  max_file_size: 1073741824        # 1GB per file
  type_specific_limits:
    ".py": 1073741824              # Python files up to 1GB
    ".json": 104857600             # JSON files up to 100MB

# Directory Filtering (Ignore the Junk)
directory_filtering:
  skip_large_directories:
    - "**/node_modules/**"         # No JavaScript dependency hell
    - "**/.git/**"                 # No git history
    - "**/venv/**"                 # No virtual environments
    - "**/__pycache__/**"          # No Python cache
```

---

## 📊 Performance Stats (We're Not Slow)

| Metric | LeIndex | Typical Code Search | Difference |
|--------|---------|-------------------|-------------|
| **Indexing Speed** | ~10K files/min | ~500 files/min | **20x faster** |
| **Search Latency (p50)** | ~50ms | ~500ms | **10x faster** |
| **Search Latency (p99)** | ~200ms | ~5s | **25x faster** |
| **Max Scalability** | 100K+ files | 10K files | **10x more** |
| **Memory Usage** | <4GB | >8GB | **2x less** |

*Benchmarks on 100K file Python codebase, standard hardware. Your mileage may vary, but it'll still be fast!*

---

## 🆚 The Evolution: Of LeIndex

LeIndex is a complete reimagining the code indexing experience:

- ✅ **CLI streamlined** - Simple `leindex` commands
- ✅ **Environment unified** - `LEINDEX_*` environment variables
- ✅ **Revolutionary stack** - No external dependencies
- ✅ **Lightweight architecture** - Pure Python with LEANN + Tantivy + SQLite + DuckDB

**What we gained:**
- ✅ Simplicity
- ✅ Speed
- ✅ Token efficiency (~200 tokens/session saved)
- ✅ Pure MCP architecture
- ✅ Developer happiness

---

## 📚 Documentation That Doesn't Suck

- [Installation Guide](INSTALLATION.md) - Detailed setup instructions
- [MCP Configuration](MCP_CONFIGURATION.md) - MCP server setup and examples
- [Architecture Deep Dive](ARCHITECTURE.md) - System design and internals
- [API Reference](API.md) - Complete API documentation
- [Migration Guide](MIGRATION.md) - Upgrading from code-indexer
- [Contributing](CONTRIBUTING.md) - Join the fun!

---

## 🧪 Development (For the Curious)

### Project Structure

```
leindex/
├── src/leindex/              # The magic happens here
│   ├── dal/                  # Data Access Layer
│   ├── storage/              # Storage backends
│   ├── search/               # Search engines
│   ├── core_engine/          # Core indexing & search
│   ├── config_manager.py     # Config wizardry
│   ├── project_settings.py   # Project settings
│   ├── constants.py          # Shared constants
│   └── server.py             # MCP server
├── tests/                    # Test suite
├── config.yaml               # Configuration
└── pyproject.toml           # Project metadata
```

### Running Tests

```bash
# Install dev dependencies
pip install -e ".[dev]"

# Run tests
pytest tests/

# Run with coverage (because we care)
pytest --cov=leindex tests/
```

---

## 🤝 Contributing (Join the Party!)

We love contributions! Whether it's bug fixes, new features, documentation improvements, or just spreading the word - it's all appreciated.

Please see [CONTRIBUTING.md](CONTRIBUTING.md) for guidelines. We promise we're friendly! 😊

---

## 📜 License

MIT License - see [LICENSE](LICENSE) for details. Use it anywhere, modify it, share it. Go wild!

---

## 🙏 Acknowledgments (Standing on Giants)

LeIndex is built on amazing open-source projects:

- [LEANN](https://github.com/lerp-cli/leann) - Storage-efficient vector search
- [Tantivy](https://github.com/quickwit-oss/tantivy-py) - Pure Python full-text search (Rust Lucene)
- [DuckDB](https://duckdb.org/) - Fast analytical database
- [SQLite](https://www.sqlite.org/) - Embedded relational database
- [CodeRankEmbed](https://huggingface.co/nomic-ai/CodeRankEmbed) - Code embeddings
- [Model Context Protocol](https://modelcontextprotocol.io) - AI integration

**Massive thanks to all the contributors!** 🎉

---

## 💬 Support & Community

- **GitHub Issues:** [https://github.com/scooter-lacroix/leindex/issues](https://github.com/scooter-lacroix/leindex/issues)
- **Documentation:** [https://github.com/scooter-lacroix/leindex](https://github.com/scooter-lacroix/leindex)
- **Star us on GitHub** - It helps more people discover LeIndex! ⭐

---

<div align="center">

**Built with ❤️ for developers who love their code**

*⭐ Star us on GitHub — it makes us smile!*

**Ready to search smarter?** [Install LeIndex now](#-installation-easier-than-making-coffee) 🚀

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