Module validate 

Answer validation with interactive re-ask.

A Validator inspects a candidate answer and either accepts it or returns a short human-readable reason. In an interactive prompt the reason is shown and the question is re-asked; in PromptMode::NonInteractive a rejected default is a typed error rather than a silent bad value.

Any Fn(&str) -> Result<(), String> is a Validator, so callers pass a closure directly; reusable rules can also implement the trait by hand.

Traits

Validator

Inspects a candidate answer, accepting it or explaining why it is rejected.

Functions

non_empty

A validator that rejects empty or whitespace-only input with message.

Type Aliases

Validation

The outcome of validating a candidate answer: Ok(()) accepts it, Err carries a short reason to display before re-asking.