handlebars 3.5.4

#[macro_use]
extern crate handlebars;
#[macro_use]
extern crate serde_json;

use handlebars::Handlebars;

handlebars_helper!(lower: |s: str| s.to_lowercase());
handlebars_helper!(upper: |s: str| s.to_uppercase());
handlebars_helper!(hex: |v: i64| format!("0x{:x}", v));
handlebars_helper!(money: |v: i64, {cur: str="$"}| format!("{}{}.00", cur, v));
handlebars_helper!(all_hash: |{cur: str="$"}| cur);
handlebars_helper!(nargs: |*args| args.len());
handlebars_helper!(has_a: |{a:i64 = 99}, **kwargs|
                   format!("{}, {}", a, kwargs.get("a").is_some()));
handlebars_helper!(tag: |t: str| format!("<{}>", t));

#[test]
fn test_macro_helper() {
    let mut hbs = Handlebars::new();

    hbs.register_helper("lower", Box::new(lower));
    hbs.register_helper("upper", Box::new(upper));
    hbs.register_helper("hex", Box::new(hex));
    hbs.register_helper("money", Box::new(money));
    hbs.register_helper("nargs", Box::new(nargs));
    hbs.register_helper("has_a", Box::new(has_a));
    hbs.register_helper("tag", Box::new(tag));

    let data = json!("Teixeira");

    assert_eq!(
        hbs.render_template("{{lower this}}", &data).unwrap(),
        "teixeira"
    );
    assert_eq!(
        hbs.render_template("{{upper this}}", &data).unwrap(),
        "TEIXEIRA"
    );
    assert_eq!(hbs.render_template("{{hex 16}}", &()).unwrap(), "0x10");

    assert_eq!(
        hbs.render_template("{{money 5000}}", &()).unwrap(),
        "$5000.00"
    );
    assert_eq!(
        hbs.render_template("{{money 5000 cur=\"£\"}}", &())
            .unwrap(),
        "£5000.00"
    );
    assert_eq!(
        hbs.render_template("{{nargs 1 1 1 1 1}}", &()).unwrap(),
        "5"
    );
    assert_eq!(hbs.render_template("{{nargs}}", &()).unwrap(), "0");

    assert_eq!(
        hbs.render_template("{{has_a a=1 b=2}}", &()).unwrap(),
        "1, true"
    );

    assert_eq!(
        hbs.render_template("{{has_a x=1 b=2}}", &()).unwrap(),
        "99, false"
    );

    assert_eq!(
        hbs.render_template("{{tag \"html\"}}", &()).unwrap(),
        "&lt;html&gt;"
    );
}