Macro inquire::max_length [−][src]
macro_rules! max_length {
($length : expr) => { ... };
($length : expr, $message : expr) => { ... };
}
Expand description
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"));