titleformat-rs 0.2.0

A foobar2000 titleformat parser for rust
Documentation 
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use crate::functions::num::to_int;

use crate::types::Error;
use crate::types::Error::*;

/* $max(a,b, ...)
 * find the maximum of a, b, c, ...
 */
pub fn max(args: Vec<String>) -> Result<String, Error> {
    if args.len() < 2 {
        return Err(InvalidNativeFunctionArgs(String::from("max"), args.len()));
    }
    Ok(args
        .iter()
        .fold(i64::MIN, |cur, x| {
            let i = to_int(x);
            if i > cur {
                i
            } else {
                cur
            }
        })
        .to_string())
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn wrong_n_arguments() {
        assert_eq!(
            max(vec![String::from("a")]).err().unwrap(),
            InvalidNativeFunctionArgs(String::from("max"), 1)
        );
    }

    #[test]
    fn test_max() {
        assert_eq!(
            String::from("2"),
            max(vec![String::from("1"), String::from("2")])
                .ok()
                .unwrap()
        );
        assert_eq!(
            String::from("2"),
            max(vec![
                String::from("-1"),
                String::from("2"),
                String::from("-4")
            ])
            .ok()
            .unwrap()
        );
    }
}