Feature request: diagnostic/metadata information

[milesj]

I'm a heavy miette user but I would like to try an error_set + eros combination. The nice thing about miette, besides the fancy UI rendering, is that it associates metadata with each error, like an error ID/code, URL, help string, etc.

It would be nice if error_set supported this natively, so that we don't have to compose so many error related libaries. Maybe something like this:

error_set! {
    LoginError = {
        #[error(code = "login:io", help = "Try x y z", url = "https://learn/more")]
        #[display("Io Error: {0}")]
        IoError(std::io::Error),
    }
}

I totally understand if this is out of scope of the library.

[mcmah309]

Is this something you think eros can support through a new fields introduced behind a feature flag or through context directly?

If so, maybe we can inject inject the information directly into a eros::TracedError.

[milesj]

Do you have an example of what that would look like?

[mcmah309]

I never used miette so I was asking you. If it is just error code information, I imagine a feature flag in eros could allow holding that information. But maybe that is not the best route.

I'm open to suggestions of what it would look like. Expanded code would be most useful. I won't be diving into miette to think of a solution. But if you have some ideas and want to explain the use case further I will happily listen and learn. Maybe even implement myself if I find it useful.