icarus_meta/src/lib.rs

pub fn add(left: u64, right: u64) -> u64 {
    left + right
}

mod meta_type {
    pub enum Type {
        Title,
        Artist,
        Album,
        Genre,
        Year,
        Track,
    }
}

mod meta {
    use super::*;
    use taglib;

    pub fn get_meta(t: meta_type::Type, filepath: &String) -> Result<String, taglib::FileError> {
        match t {
            meta_type::Type::Title => {
                match get_file(filepath) {
                    Ok(file) => {
                        match get_tag(&file) {
                            Ok(tag) => {
                                match tag.title() {
                                    Some(title) => Ok(title),
                                    None => Err(taglib::FileError::NoAvailableTag)
                                }
                            }
                            Err(err) => Err(err)
                        }
                    }
                    Err(err) => Err(err)
                }
            }
            _ => Err(taglib::FileError::InvalidFile),
        }
    }

    fn get_file(filepath: &String) -> Result<taglib::File, taglib::FileError> {
        taglib::File::new(filepath)
    }

    fn get_tag(tag: &taglib::File) -> Result<taglib::Tag, taglib::FileError> {
        tag.tag()
    }
}

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

    #[test]
    fn it_works() {
        let result = add(2, 2);
        assert_eq!(result, 4);
    }
}