Macro inquire::max_length

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

Built-in validator that checks whether the answer length is smaller than or equal to the specified threshold.

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

Examples

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

let validator: StringValidator = max_length!(5);
assert_eq!(Ok(()), validator("Good"));
assert_eq!(Err(String::from("The length of the response should be at most 5")), validator("Terrible"));

let validator: StringValidator = max_length!(5, "Not too large!");
assert_eq!(Ok(()), validator("Good"));
assert_eq!(Err(String::from("Not too large!")), validator("Terrible"));