🦙 LazyLlama

LazyLlama is a lightweight, fast Terminal User Interface (TUI) client for Ollama. It is designed for running local AI models with minimal overhead and intuitive, Emacs-inspired controls directly in your terminal.

✨ Features

• Real-time Streaming: Responses are generated live, providing immediate feedback.
• Markdown Support: Automatic formatting for headers, lists, and bold text.
• Code Highlighting: Syntax blocks are visually separated with custom borders and background colors.
• Smart Scrolling: * AUTOSCROLL: Automatically follows the AI output.
  • MANUAL SCROLL: Locks the view (🔒) when you use PageUp/Down, allowing you to read previous messages undisturbed.
• Model Management: Easily switch between installed Ollama models using Ctrl+arrow keys with separate input/output buffers per model.
• Smart Buffer Management: Each LLM maintains its own chat history, input text, and scroll position.
• Automatic Logging: Every chat session is automatically saved as a text file in ~/.local/share/lazyllama/ (both combined and per-model histories).
• Performance: Built with Rust and Ratatui for ultra-low latency and minimal resource footprint.

🚀 Installation

Prerequisites

• Rust (Stable)
• Ollama (must be running in the background)

Build from Source

1. Clone the repository:

   git clone https://github.com/Pommersche92/lazyllama.git
   
   cd lazyllama
   
   

2. Install it system-wide:

   cargo install --path .
   
   

⌨️ Controls

Optional debug:

• LAZYLLAMA_DEBUG_KEYS=1 shows key/scroll/render info in the status bar.

🛠 Project Structure

The project follows a modular design for easy maintainability:

• main.rs: Entry point and terminal event handling.
• app.rs: State management and Ollama API integration.
• ui.rs: Rendering logic and Markdown parsing.
• utils.rs: File system operations and session logging.

📖 Documentation

You can generate the full technical documentation locally:

cargo doc --no-deps --open

🧪 Testing

LazyLlama features a comprehensive test suite with 78 tests covering all functionality:

• Unit Tests: 68 modularized tests for individual components
• Integration Tests: 7 end-to-end tests for component interaction
• Performance Benchmarks: Continuous performance monitoring

Running Tests

# Run all tests (unit, integration, doc tests)

cargo test


# Run only unit tests

cargo test --test test_unit


# Run benchmarks with detailed output

cargo test --release --benches -- --nocapture --test-threads=1

Performance Benchmarks

LazyLlama is optimized for ultra-low latency with all operations completing well within the 16ms frame budget for 60 FPS rendering:

Legend: ⚡⚡⚡ < 10 ns | ⚡⚡ < 1 µs | ⚡ < 10 µs | ✅ < 100 µs

All benchmarks run on optimized release builds. Run cargo test --release --benches to execute the full benchmark suite.

For detailed testing information, test structure, and maintenance guidelines, see TESTING.md.

📄 License

This project is licensed under the GPL-2.0-or-later. See the LICENSE file for details.

📝 Changelog

v0.4.1 - February 2026

• 🔼 Extended Input Height: Input field now expands up to 5 lines (increased from 4)
  • Maximum height: 5 lines, giving more space for longer prompts
• 📍 Smart Cursor Scrolling: Input field automatically scrolls to keep cursor visible
  • When cursor moves beyond visible area, the input scrolls automatically
  • Smooth navigation in long multiline inputs
• ⌨️ Improved Keybindings:
  • Ctrl + ↑ / ↓: Switch between AI models (changed from plain arrow keys)
  • ↑ / ↓: Move cursor up/down between lines in multiline input (new feature)
  • More intuitive navigation in multiline text editing

v0.4.0 - February 2026

• 📏 Dynamic Input Height: Input field now automatically expands from 1 to 5 lines based on content
  • Grows dynamically when pressing Shift+Enter to add newlines
  • Minimum height: 1 line, Maximum height: 5 lines
  • Provides more comfortable editing space for longer prompts
• ✨ Improved Multiline Rendering: Proper line-by-line rendering with selection and cursor support
  • Each line is rendered independently with correct styling
  • Selection highlighting works correctly across multiple lines
  • Cursor position is accurately displayed within multiline text
• 📝 Multiline Input: Press Shift+Enter to insert line breaks in the input field for multiline messages
• ✂️ Text Selection: Select text in the input field using keyboard shortcuts
  • Shift + ← / →: Select text character by character
  • Shift + Ctrl + ← / →: Select text word by word
  • Shift + Home / End: Select from cursor to start/end of input
• 📋 Clipboard Operations: Copy and paste functionality for the input field
  • Ctrl + Shift + C: Copy selected text to clipboard
  • Ctrl + Shift + V: Paste text from clipboard at cursor position
• 🎨 Visual Selection Feedback: Selected text is highlighted with a blue background for clear visibility
• 🔄 Smart Text Insertion: Pasting text automatically replaces any active selection
• 📦 Dependency: Added arboard library for cross-platform clipboard access
• 📦 Dependency Updates: Updated all dependencies to their latest versions
  • ratatui: 0.26 → 0.30.0 (TUI framework with improved frame API)
  • crossterm: 0.27 → 0.29.0 (terminal manipulation library)
  • dirs: 5.0 → 6.0.0 (platform-specific directory paths)
  • tokio-stream: 0.1 → 0.1.18 (async stream utilities)
  • tempfile: 3.8 → 3.25.0 (dev dependency for test file management)
  • tokio-test: 0.4 → 0.4.5 (dev dependency for async testing)
• 🔄 API Migration: Updated code to use frame.area() instead of deprecated frame.size() method
• 🧪 Comprehensive Test Suite: Added 78 tests for robust code quality assurance
  • Unit Tests: 68 modularized tests extracted to separate files for better maintainability
    • App functionality: 33 tests for cursor navigation, model management, text editing, selection, clipboard
    • UI components: 13 tests for markdown parsing, syntax highlighting, text rendering
    • Utilities: 10 tests for filesystem operations, history management
    • Event handling: 12 tests for key combinations, terminal integration
  • Integration Tests: 7 end-to-end tests for component interaction
  • Performance Benchmarks: Continuous monitoring for performance-critical functions
• 🔧 Improved Testability: Made internal functions public for comprehensive unit testing
• 📚 Enhanced Documentation: Updated test documentation and added detailed testing guide

v0.3.0 - February 2026

• 🧹 Clean Chat Redraw: Clears the chat area before rendering to prevent leftover characters when scrolling
• ⌨️ Input Cursor: Horizontal cursor navigation with Left/Right and a blinking caret in the input field
• 🏁 Home/End Navigation: Jump to start/end of the input line
• 🧭 Word-wise Movement: Ctrl+Left/Right moves by words with smart separators
• 🗑 Word Deletion: Ctrl+Backspace deletes previous word, Ctrl+Delete deletes next word
• ⌦ Delete Key Support: Delete removes the character after the cursor
• 🧪 Dev Key Debug Mode: Optional status bar debug via LAZYLLAMA_DEBUG_KEYS=1

v0.2.0 - February 2026

• 🎯 Per-Model Buffer Management: Each LLM now maintains separate input buffers, chat histories, and scroll positions
• 🔄 Smart Model Switching: Ctrl+Arrow keys now seamlessly switch between models while preserving individual states
• 💾 Enhanced Logging: Separate history files are saved for each model on application exit
• 🎨 Improved UI: Model list shows buffer status indicators and current model highlighting
• 🪟 Windows Compatibility: Fixed double character input issue on Windows by filtering key event types
• 📖 Translated Documentation: Documentation in source code AI-translated from german to english
  • Please report any gramatical errors, AI weirdness and/or other inaccuracies in the github issues.

v0.1.0 - Initial Release

• Basic TUI interface for Ollama
• Real-time streaming responses
• Markdown and code highlighting
• Smart scrolling with autoscroll/manual modes
• Model selection and automatic logging

Developed with ❤️ in the black forest.