Declarative Command Line Tool Package for Go

urfave/cli is a declarative, simple, fast, and fun package designed for building command line tools in Go. This library provides a range of features that enhance the development of command line applications.

Key features:

• Commands and Subcommands - Supports alias and prefix match functionality.
• Flexible Help System - Offers a permissive help system for user guidance.
• Dynamic Shell Completion - Compatible with bash, zsh, fish, and powershell.
• No External Dependencies - Only requires the Go standard library.
• Input Flags - Supports simple types, slices, time, and duration.
• Compound Short Flag Support - Allows for shortened flag usage.
• Documentation Generation - Generates documentation in man and Markdown formats.
• Input Lookup - Can retrieve input from environment variables and structured file formats.

This package is particularly useful for developers looking to create robust command line interfaces with minimal overhead.