what2watch/src/util.rs

use std::{error::Error, ops::Range};

pub fn validate_optional_length<E: Error>(
    opt: &Option<String>,
    len_range: Range<usize>,
    err: E,
) -> Result<Option<String>, E> {
    if let Some(opt) = opt {
        let opt = opt.trim();
        if !len_range.contains(&opt.len()) {
            Err(err)
        } else {
            Ok(Some(opt.to_string()))
        }
    } else {
        Ok(None)
    }
}