Obtains a list of all videos in a given directory path

get_videos.rs

/// Collects a list of all of the episodes in a given directory. Files that are not videos are ignored.
pub fn get_episodes(directory: &str) -> Result<Vec<PathBuf>, &str> {
    fs::read_dir(directory).ok().map_or(Err("tv-renamer: unable to read file"), |files| {
        let video_extensions = try!(mimetypes::get_video_extensions());
        let mut episodes = Vec::new();
        for entry in files {
            let status = entry.ok().map_or(Some("tv-renamer: unable to get file entry"), |entry| {
                entry.metadata().ok().map_or(Some("tv-renamer: unable to get metadata"), |metadata| {
                    if metadata.is_file() {
                        for extension in &video_extensions {
                            if extension.as_str() == entry.path().extension().unwrap().to_str().unwrap() {
                                episodes.push(entry.path());
                            }
                        }
                    }
                    None
                })
            });
            if status.is_some() { return Err(status.unwrap()); }
        }
        episodes.sort_by(|a, b| a.to_string_lossy().to_lowercase().cmp(&b.to_string_lossy().to_lowercase()));
        Ok(episodes)
    })
}