titlefmt 0.4.0

Metadata Title Formatting Library
Documentation 
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use super::Error;
use expression::{Evaluation, Expression, Value};
use metadata;

pub fn iflonger<T: metadata::Provider>(
    expressions: &[Box<Expression<T>>],
    provider: &T,
) -> Result<Evaluation, Error> {
    if expressions.len() != 4 {
        return Err(Error::ArgumentError);
    }
    let (string, _) = expect_string_result!(&expressions[0], provider);
    let (min_len, _) = expect_integer_result!(&expressions[1], provider, usize);
    let result = {
        if string.chars().count() > min_len {
            expressions[2].apply(provider)
        } else {
            expressions[3].apply(provider)
        }
    };
    Ok(result)
}