titlefmt 0.4.0

Metadata Title Formatting Library
Documentation 
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use super::Error;
use expression::{Evaluation, Expression, Value};
use metadata;
use std::ops::Deref;
use std::path::Path;

pub fn directory_path<T: metadata::Provider>(
    expressions: &[Box<Expression<T>>],
    provider: &T,
) -> Result<Evaluation, Error> {
    if expressions.len() < 1 {
        return Err(Error::ArgumentError);
    }
    let (original_string, truth) = expect_string_result!(&expressions[0], provider);
    let file_path = Path::new(original_string.as_str());
    let result_path = {
        if file_path.is_dir() {
            file_path
        } else {
            match file_path.parent() {
                Some(dir) => dir,
                None => Path::new("/"),
            }
        }
    };
    let result_text: String = result_path.to_string_lossy().deref().to_owned();
    Ok(Evaluation::new(Value::Text(result_text), truth))
}

#[cfg(test)]
mod test;