Function truncate 

pub fn truncate(line: &str, width: usize) -> String

Shortens line to at most width visible columns, ending it with … when something was cut.

Styles that are open at the cut are closed. A line that fits is returned unchanged.

use shellgame::ui::text::truncate;

assert_eq!(truncate("abcdefgh", 5), "abcd…");
assert_eq!(truncate("abc", 5), "abc");