
---
title: Core Systems Documentation
description: Core system component documentation
category: core-systems
status: stable
last_updated: 2025-01-15
version: 1.0.0
tags:
  - level: advanced
  - component: core-systems
  - status: stable
---

# Core Systems Documentation

Complete technical documentation for all core system components.

## Overview

The core systems layer provides the fundamental functionality of the Kollabor CLI application. Each system is a specialized component that handles a specific domain of functionality.

## Documents

### Plugin System Architecture
**[Plugin System Architecture](plugin-system.md)** - Complete plugin lifecycle and management

**Description**: Comprehensive documentation of the plugin system, including discovery, instantiation, registration, and lifecycle management.

**Topics**:
- PluginDiscovery - File system scanning and module loading
- PluginFactory - Instantiation with dependency injection
- PluginRegistry - Plugin coordination and management
- PluginStatusCollector - Startup information collection
- Plugin lifecycle (5 phases)
- Security model (8 layers of validation)
- Configuration management

**Level**: Advanced  
**Status**: Stable

**Key Components**:
- `core/plugins/discovery.py` - Plugin discovery
- `core/plugins/factory.py` - Plugin instantiation
- `core/plugins/registry.py` - Plugin registry
- `core/plugins/collector.py` - Status collection

**Related**:
- [Plugin Development Tutorial](../plugin-development/plugin-development-tutorial.md)
- [Event System Architecture](../architecture/event-system.md)

---

### Input Handling System
**[Input Handling System](input-handling.md)** - Input processing and command management

**Description**: Complete input handling architecture using Facade pattern, coordinating 8 specialized components for comprehensive input processing.

**Topics**:
- InputHandler Facade - Central coordination
- InputLoopManager - Main loop and platform I/O
- KeyPressHandler - Key processing and special keys
- CommandModeHandler - Slash commands and menus
- ModalController - Modal lifecycle management
- HookRegistrar - Event hook registration
- DisplayController - Display control and pause/resume
- PasteProcessor - Paste detection and placeholders
- StatusModalRenderer - Status modal lines

**Level**: Advanced  
**Status**: Stable

**Key Components**:
- `core/io/input/input_handler.py` - Main facade
- `core/io/input/input_loop_manager.py` - Input loop
- `core/io/input/key_press_handler.py` - Key processing
- `core/io/input/command_mode_handler.py` - Command mode
- `core/ui/modal_controller.py` - Modal lifecycle

**Related**:
- [Event System Architecture](../architecture/event-system.md)
- [Terminal Rendering System](terminal-rendering.md)
- [Command Mode](../plugin-development/slash-commands-guide.md)

---

### Terminal Rendering System
**[Terminal Rendering System](terminal-rendering.md)** - Display formatting and visual effects

**Description**: Complete terminal rendering system, including message formatting, status bar management, visual effects, and terminal state management.

**Topics**:
- TerminalRenderer - Main rendering coordinator
- MessageRenderer - Message formatting and colors
- MessageCoordinator - Atomic message sequencing
- StatusRenderer - Status bar management
- LayoutManager - Terminal layout calculations
- VisualEffects - Gradients, shimmer, color management
- TerminalState - Terminal state and mode switching
- Render caching with dirty region tracking

**Level**: Advanced  
**Status**: Stable

**Key Components**:
- `core/io/terminal_renderer.py` - Main renderer
- `core/io/message_renderer.py` - Message formatting
- `core/io/message_coordinator.py` - Message coordination
- `core/io/status_renderer.py` - Status bar
- `core/io/visual_effects.py` - Visual effects

**Related**:
- [Input Handling System](input-handling.md)
- [Buffer Transition](../reference/buffer-transition-and-render-state.md)
- [Modal System Guide](../reference/modal-system-guide.md)

---

## System Interactions

### Input Flow
```
Keyboard → InputLoopManager → KeyPressHandler → EventBus
                                                      ↓
                                            CommandModeHandler / ModalController
                                                      ↓
                                               TerminalRenderer
```

### Render Flow
```
EventBus → MessageCoordinator → MessageRenderer → Terminal Display
                                              ↓
                                      StatusRenderer → Status Bar
```

### Plugin Flow
```
PluginDiscovery → PluginFactory → PluginRegistry → EventBus
                                                          ↓
                                               Hook Registration
```

---

## Key Patterns

### Facade Pattern
- **Used By**: InputHandler, TerminalRenderer
- **Purpose**: Simplified interface to complex subsystems
- **Benefit**: Easy to use, hides complexity
- **Documentation**: [Input Handling](input-handling.md)

### Coordinator Pattern
- **Used By**: MessageCoordinator, PluginRegistry
- **Purpose**: Coordinate between multiple components
- **Benefit**: Centralized control, consistent behavior
- **Documentation**: [Terminal Rendering](terminal-rendering.md), [Plugin System](plugin-system.md)

### Factory Pattern
- **Used By**: PluginFactory
- **Purpose**: Create plugin instances with dependencies
- **Benefit**: Centralized instantiation, dependency injection
- **Documentation**: [Plugin System](plugin-system.md)

### Strategy Pattern
- **Used By**: CommandModeHandler, ModalController
- **Purpose**: Different behavior based on mode/context
- **Benefit**: Flexible, extensible behavior
- **Documentation**: [Input Handling](input-handling.md)

---

## Configuration

### Plugin System
```json
{
  "plugins": {
    "enabled": true,
    "directory": "plugins",
    "auto_discovery": true
  }
}
```

### Input Handling
```json
{
  "input": {
    "paste_threshold": 0.01,
    "min_paste_length": 5,
    "max_message_length": 10000
  }
}
```

### Terminal Rendering
```json
{
  "terminal": {
    "render_fps": 20,
    "status_lines": 3,
    "render_cache_enabled": true
  }
}
```

---

## Performance Considerations

### Plugin System
- Plugin discovery runs at startup (lightweight mode available)
- Plugin instantiation is lazy (on-demand)
- Hook execution is async (non-blocking)

### Input Handling
- Platform-specific I/O for optimal performance
- Paste detection uses timing threshold
- Key processing is immediate

### Terminal Rendering
- Render caching reduces duplicate renders
- Dirty region tracking minimizes redraws
- Async rendering prevents blocking

---

## Troubleshooting

### Plugin Issues
- **Problem**: Plugin not loading
- **Check**: File naming, get_default_config(), __init__ signature
- **Documentation**: [Plugin System](plugin-system.md#troubleshooting)

### Input Issues
- **Problem**: Keys not registering
- **Check**: Input loop status, raw mode, event bus hooks
- **Documentation**: [Input Handling](input-handling.md#troubleshooting)

### Rendering Issues
- **Problem**: Display not updating
- **Check**: Render loop, dirty regions, terminal state
- **Documentation**: [Terminal Rendering](terminal-rendering.md#troubleshooting)

---

## Related Documentation

### Architecture
- [System Architecture](../architecture/system-architecture.md)
- [Event System Architecture](../architecture/event-system.md)

### LLM Integration
- [LLM Service Architecture](../llm-integration/llm-service.md)
- [LLM Message Flow](../reference/llm-message-flow.md)

### Plugin Development
- [Plugin Development Tutorial](../plugin-development/plugin-development-tutorial.md)
- [Hook System SDK](../architecture/hook-system-sdk.md)

---

## Component Reference

### Plugin System
- **Discovery**: `core/plugins/discovery.py`
- **Factory**: `core/plugins/factory.py`
- **Registry**: `core/plugins/registry.py`
- **Collector**: `core/plugins/collector.py`

### Input Handling
- **InputHandler**: `core/io/input/input_handler.py`
- **InputLoopManager**: `core/io/input/input_loop_manager.py`
- **KeyPressHandler**: `core/io/input/key_press_handler.py`
- **CommandModeHandler**: `core/io/input/command_mode_handler.py`
- **ModalController**: `core/ui/modal_controller.py`

### Terminal Rendering
- **TerminalRenderer**: `core/io/terminal_renderer.py`
- **MessageRenderer**: `core/io/message_renderer.py`
- **MessageCoordinator**: `core/io/message_coordinator.py`
- **StatusRenderer**: `core/io/status_renderer.py`
- **VisualEffects**: `core/io/visual_effects.py`

---

**Last Updated**: 2025-01-15  
**Status**: Stable  
**Version**: 1.0.0
