go-flags

Uses Go structs with tags to define options, reducing boilerplate code significantly, as shown in the example where Verbose is defined with short and long names.

Handles advanced types like slices, maps, pointers, and callbacks, enabling complex option parsing beyond primitive types, as demonstrated with StringSlice and IntMap in the README.

Supports short/long options, optional arguments, and remaining arguments after --, offering versatile CLI design, including multiple option groups and environment variable integration.

Generates well-formatted help messages automatically from struct tags, improving user experience without manual formatting.