Feature Request: choices about argh HOT 5 OPEN

Yeah this would be interesting. We don’t have a built in way to do this at the moment, but you could use a helper function to do it. See this test for an example: https://github.com/google/argh/blob/master/argh/tests/lib.rs#L67. You’d just have to manually parse the argument into your enum.

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My preference for this would be another proc macro to annotate enums with, similar to how sub-commands are defined, except that these enums would not be allowed to have any data associated. Clap has this feature and calls it ValueEnum:

https://docs.rs/clap/latest/clap/trait.ValueEnum.html

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@bbstilson this is definitely possible with current argh. The intended way you're supposed to do this is by defining an enum with your "choices" then implementing FromStr on it. If your String input is only supposed to represent a finite number of values you should re-think storing it as a String, that's what enum was created for.

Good Luck!

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