Macro inquire::length

macro_rules! length {
    ($length : expr) => { ... };
    ($length : expr, $message : expr) => { ... };
}

Built-in validator that checks whether the answer length is equal to the specified value.

When using this macro, you must also import the InquireLength trait. The validator uses a custom-built length function that has a special implementation for strings, as we can’t rely on a generic .len() for them. See this StackOverflow question.

Arguments

• $length - Expected length of the input.
• $message - optional - Error message returned by the validator. Defaults to “The length of the response should be $length”

Examples

use inquire::{length, validator::{InquireLength, StringValidator}};

let validator: StringValidator = length!(3);
assert_eq!(Ok(()), validator("Yes"));
assert_eq!(Err(String::from("The length of the response should be 3")), validator("No"));

let validator: StringValidator = length!(3, "Three characters please.");
assert_eq!(Ok(()), validator("Yes"));
assert_eq!(Err(String::from("Three characters please.")), validator("No"));