Optional input API

[joepio]

Hi there! Thanks for creating this :)

I have some input fields that are optional. I'd like to have an API similar to this:

let number: Option<u32> = Input::new().with_prompt("What's your age?").interact()?;

Maybe I'm missing something in the docs, but I don't really see how I should achieve these optional inputs.

I know you can use .allow_empty, but that doesn't really work for things like numbers.

[joepio]

Back here 2yrs later, trying again to switch from promptly to dialoguer.

Anyways, I still want to have a "skippable" form field, but I don't know how I can achieve this.

fn prompt_opt(msg: &str) -> AtomicResult<Option<String>> {
    dialoguer::Input::new()
        .with_prompt(msg)
        .interact()
        .map(|s: String| if s.is_empty() { None } else { Some(s) })
        .map_err(|e| format!("Error while prompting: {}", e).into())
}

This seemed sensible, but if I press enter when the string is empty nothing happens. I'm assuming I'm missing something obvious!

[jonassmedegaard]

I guess you are missing .allow_empty(true).

[pksunkara]

Try interact_opt instead of interact

[jonassmedegaard]

Try interact_opt instead of interact

Ah, right - that too.

[pksunkara]

Closing this until further response that the suggestion doesn't work.