Not the same. The point Gooey is to use the definition of the arguments (which we could call the program command-line grammar) to automatically build an UI. B

Not the same. The point Gooey is to use the definition of the arguments (which we could call the program command-line grammar) to automatically build an UI. But I see much more potential for the Raku world where there is built-in syntax for declaring arguments with strong typing. https://docs.raku.org/language/create-cli#sub_MAIN https://docs.raku.org/language/create-cli#sub_MAIN But I'm thinking about something similar for any program that provides shell completion scripts: it would have to parse the shell completion definition to build the UI.