umili 0.2.2

Mutate and observe Rust data structures
Documentation 
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use serde::{Serialize, Deserialize};
use umili::{observe, Change, Observe};

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Observe)]
pub struct Foo {
    pub bar: Bar,
    pub qux: String,
}

#[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Observe)]
pub struct Bar {
    pub baz: i32,
}

#[test]
fn main() {
    let mut foo = Foo { bar: Bar { baz: 42 }, qux: "hello".to_string() };

    let diff = observe!(|mut foo| {
        foo.bar.baz += 1;
        foo.qux += " world";
    }).unwrap();

    assert_eq!(diff, vec![
        Change::set("bar/baz", 43).unwrap(),
        Change::append("qux", " world").unwrap(),
    ]);

    assert_eq!(foo, Foo { bar: Bar { baz: 43 }, qux: "hello world".to_string() });
}