titleformat-rs 0.2.0

A foobar2000 titleformat parser for rust
Documentation 
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use crate::environment::value_string;
use crate::environment::Value;
use crate::types::Error;
use crate::types::Error::*;

pub fn len(args: Vec<Value>) -> Result<Value, Error> {
    match args.len() {
        1 => {
            let val = &args[0];
            Ok(value_string(val.val.len().to_string().as_str(), val.cond))
        }
        _ => Err(InvalidNativeFunctionArgs(String::from("len"), args.len())),
    }
}

pub fn longer(args: Vec<Value>) -> Result<Value, Error> {
    match args.len() {
        2 => Ok(value_string("", args[0].val.len() > args[1].val.len())),
        _ => Err(InvalidNativeFunctionArgs(
            String::from("longer"),
            args.len(),
        )),
    }
}

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

    #[test]
    fn wrong_n_arguments() {
        assert_eq!(
            len(vec![]).err().unwrap(),
            InvalidNativeFunctionArgs(String::from("len"), 0)
        );
        assert_eq!(
            longer(vec![]).err().unwrap(),
            InvalidNativeFunctionArgs(String::from("longer"), 0)
        );
    }

    #[test]
    fn test_len() {
        assert_eq!(
            len(vec![value_string("12345", true)]).unwrap(),
            value_string("5", true)
        );
    }

    #[test]
    fn test_longer() {
        /* do we return the longer string as well? */
        assert_eq!(
            longer(vec![value_string("12345", true), value_string("123", true)]).unwrap(),
            value_string("", true)
        );
        assert_eq!(
            longer(vec![value_string("123", true), value_string("12345", true)]).unwrap(),
            value_string("", false)
        );
    }
}