A nicer help menu

[MilesCranmer]

I think Julia's help menu could be made much nicer with clap.rs: colors to improve readability, automatic wrapping to the terminal width, and generation of detailed shell completion files.

I have made a PR here for it: JuliaLang/juliaup#1236 - more discussion there

Like juliaup itself, this help menu is rust-based, so at the moment it unfortunately can't live within Julia's source tree itself (perhaps if rust is one day integrated in the build process). However the help menus are slightly different (e.g., [+channel]) so I guess some differences are expected anyways.

[gbaraldi]

It can probably be written in julia.

[MilesCranmer]

I don't follow; do you mean I should move this to the Julia source tree?

[MilesCranmer]

Also see JuliaLang/juliaup#1234 (comment)