Consider giving 'argh' a try

[ExpHP]

I was looking at argh just now and it looks pretty good.

Normally I avoid this sort of #[derive(CliArg)] sort of deal because I tend to worry that the trait won't be expressive enough... but if it's similar enough to the traits I'm already writing, then what's the problem? It'd be cool to test it out on something with reasonably complicated args like truth and see if I have finally found the one good CLI parsing library in the ecosystem, so that I can finally stop stressing out every time I have to parse args in rust.

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It mentions Fuschia and I found this: https://fuchsia.dev/fuchsia-src/concepts/api/cli

Some of the stuff on there seems concerning. (no -vsnr, and they (agreeably) advise against the equals sign in -o=<my_output_file> while using language that would appear to also (questionably) forbid --output=<my_output_file)...