koto 0.16.1

A simple, expressive, embeddable programming language
Documentation 
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use koto::prelude::*;

fn main() {
    let script = "
from my_module import echo, square

print echo 'Hello'
print square 9
";
    let mut koto = Koto::default();
    koto.prelude().insert("my_module", make_module());
    koto.compile_and_run(script).unwrap();
}

fn make_module() -> KMap {
    // The `KMap::with_type` initializer sets up an empty map with a `@type` entry.
    let module = KMap::with_type("my_module");

    module.add_fn("echo", |ctx| match ctx.args() {
        [KValue::Str(s)] => Ok(format!("{s}!").into()),
        unexpected => unexpected_args("|String|", unexpected),
    });

    module.add_fn("square", |ctx| match ctx.args() {
        [KValue::Number(n)] => Ok((n * n).into()),
        unexpected => unexpected_args("|Number|", unexpected),
    });

    module
}