urfave/cli is a Go library for building command-line applications with a declarative syntax.
The library addresses the common need to construct CLI tools quickly without external dependencies. It works by letting developers declare commands, subcommands, and flags in a straightforward way, then handling parsing, validation, and help text generation automatically. The approach emphasizes simplicity and speed while remaining flexible enough to support complex command hierarchies.
Developers should choose this tool if they are building command-line applications in Go and want to avoid dependency management overhead, since the library relies only on the Go standard library. It suits projects ranging from simple single-command tools to complex applications with nested subcommands. The library handles common requirements like shell completion for bash, zsh, fish, and powershell, compound short flags, and input from environment variables or configuration files in plain text or structured formats like YAML and TOML.
The project maintains a steady stream of issue responses and accepts pull requests, with maintainers actively engaging in discussions. Development activity shows consistent attention to bug reports and feature requests, though the README notes the project is run by unpaid volunteers.
