Function pathdiff::diff_paths

pub fn diff_paths<P, B>(path: P, base: B) -> Option<PathBuf> where
    P: AsRef<Path>,
    B: AsRef<Path>, 

Construct a relative path from a provided base directory path to the provided path.

use pathdiff::diff_paths;
use std::path::*;

let baz = "/foo/bar/baz";
let bar = "/foo/bar";
let quux = "/foo/bar/quux";
assert_eq!(diff_paths(bar, baz), Some("../".into()));
assert_eq!(diff_paths(baz, bar), Some("baz".into()));
assert_eq!(diff_paths(quux, baz), Some("../quux".into()));
assert_eq!(diff_paths(baz, quux), Some("../baz".into()));
assert_eq!(diff_paths(bar, quux), Some("../".into()));

assert_eq!(diff_paths(&baz, &bar.to_string()), Some("baz".into()));
assert_eq!(diff_paths(Path::new(baz), Path::new(bar).to_path_buf()), Some("baz".into()));