Build a matcher for a set of glob overrides using the `ignore` crate.

ignore_override.rs

use ignore::WalkBuilder;
use ignore::overrides::OverrideBuilder;

fn main() {
    let folder = "/tmp/files";
    let mut override_builder = OverrideBuilder::new(folder);
    override_builder.add("!test.txt").unwrap();
    override_builder.add("!test.rs").unwrap();
    let or = override_builder.build().unwrap();
    
    let mut builder = WalkBuilder::new(folder);
    builder.overrides(or);
    builder.standard_filters(false);

    for result in builder.build() {
        let dent = result.unwrap();
        println!("{}", dent.path().display());
    }
}