use regex::Regex;

pub fn realpath(path: &str) -> String {
    let components: Vec<&str> = Regex::new("/+")
        .expect("Error parsing regex /+.")
        .split(path)
        .collect();
    let mut abs_path: Vec<&str> = Vec::new();
    for component in components {
        if (Regex::new("^\\.$")
            .expect("Error parsing regex ^\\.$")
            .is_match(component))
            || (Regex::new("^$")
                .expect("Error parsing regex ^$.")
                .is_match(component))
        {
            continue;
        } else if Regex::new("^\\.\\.$")
            .expect("Error parsing regex ^\\.\\.$.")
            .is_match(component)
        {
            abs_path.pop();
        } else {
            abs_path.push(component);
        }
    }
    let abs_path: &str = &abs_path.join("/");
    ["/", abs_path].join("")
}