$ show jesseduffield/lazydocker
Lazydocker is a mature, well-structured terminal UI application for managing Docker and Docker Compose environments. Built in Go using a forked version of the gocui library, it provides a unified interface for viewing containers, services, images, volumes, and networks with real-time monitoring, log streaming, and interactive command execution. The architecture follows a clean separation between the command layer (Docker API interactions, OS command execution), presentation layer (display string formatting), and GUI layer (gocui-based terminal interface with panels and keybindings). The codebase demonstrates solid engineering practices with a generic, thread-safe FilteredList data structure that efficiently handles filtering and sorting without modifying underlying data. The task management system supports cancellable, concurrent operations with proper context propagation. The SSH tunneling implementation for remote Docker hosts is particularly well-crafted, using dependency injection for testability. The project maintains active development with recent commits, comprehensive CI/CD across multiple platforms, and support for 9 languages. Key architectural patterns include a panel-based UI composition where each side panel (containers, services, images, etc.) shares common infrastructure through generic types, a context-aware main panel that re-renders based on selected items, and a flexible template system for The configuration system supports extensive customization while maintaining sensible defaults. The codebase uses vendored dependencies for reproducible builds and includes proper error handling with user-friendly error messages.
The LLM identified 6 files worth highlighting for reuse:
A generic, thread-safe FilteredList data structure that maintains a master list and a filtered view using indices. Supports concurrent read/write access via RWMutex, efficient filtering without data copying, and custom sort comparators. This pattern is reusable for any list-based UI requiring real-time filtering and sorting.
Handles SSH tunneling for remote Docker hosts by parsing DOCKER_HOST environment variable, creating local Unix socket tunnels via SSH, and implementing retry logic with context-based cancellation. Uses dependency injection for all external dependencies (dialing, command execution, temp dirs) making it fully testable. Demonstrates clean separation of concerns and robust error handling.
A concurrent task manager that supports starting, stopping, and ticker-based recurring tasks with proper context cancellation and deadlock-safe mutex handling. Uses a 'notifyStopped' channel pattern to ensure clean task termination. The design allows only one active task at a time, automatically canceling previous tasks when new ones start.
Renders real-time container statistics as ASCII graphs using the asciigraph library. Dynamically accesses nested struct fields via reflection using dot-notation paths (e.g., 'DerivedStats.CPUPercentage'), converts unknown types to float64 for plotting, and supports configurable graph dimensions and colorization. Demonstrates advanced Go reflection techniques for flexible data visualization.
A generic context state manager for tabbed panel interfaces that tracks the current tab selection and generates cache keys based on item identity and tab state. Supports tab navigation and invalidation of cached content when context changes. This pattern is reusable for any multi-tab detail view that needs to cache rendered content.
Provides essential utilities including a Go template-based command resolver with placeholder substitution, YAML syntax highlighting using lexer tokenization, and aligned table rendering with proper Unicode width handling. The MarshalIntoYaml function cleverly converts JSON-tagged structs to YAML by round-tripping through JSON to preserve structure.