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Stop writing CLI validation. Parse it right the first time. (hackers.pub)
submitted 1 year ago by to c/programming@programming.dev
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[–] 11 points 1 year ago (2 children)

clap already supports all this: https://docs.rs/clap/latest/clap/struct.Arg.html#method.conflicts_with It's just a great library, having you could think of and applying the same parse-don't-validate mentality.

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  • [–] 9 points 1 year ago (1 child)

    This doesn't represent the mutual exclusivity through the type system (which is what the article is all about).

    I love clap and I use it a lot, but the only way to represent the exclusivity through the type system in Rust is through an enum.

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  • [–] 5 points 1 year ago

    Agreed. As nice as clap is, it's not a combinator. Parser combinators have a the really nice feature of sharing the same "shape" as the data they parse, which makes them trivial to generate from a schema ... or to just use them to represent your schema in the first place ;) .

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