The web content provides detailed information about the GNU command line argument parser, including features like message scan into struct fields, composite field types, and nested subcommands. The rules for GNU command line arguments are outlined, emphasizing options, long options, values, and nested subcommands. Installation instructions for Git and Go are provided, along with examples of default usage, subcommands, arguments, options (basic and composite types), counts, appends, configs, lists, dicts, and option tags. A unique feature is the ability to load all arguments from a TOML configuration file. The content also includes information about licenses and adding custom sources for lists and dicts.
https://github.com/tdewolff/argp