Struct Patch

A lib help you patch Rust instance, and easy to partial update configures.

Introduction

This crate provides the Patch trait and an accompanying derive macro.

Deriving Patch on a struct will generate a struct similar to the original one, but with all fields wrapped in an Option.
An instance of such a patch struct can be applied onto the original struct, replacing values only if they are set to Some, leaving them unchanged otherwise.

Quick Example

```rust use struct_patch::Patch; use serde::{Deserialize, Serialize};

[derive(Default, Debug, PartialEq, Patch)]

[patch_derive(Debug, Default, Deserialize, Serialize)]

struct Item { fieldbool: bool, fieldint: usize, field_string: String, }

fn patchjson() { let mut item = Item { fieldbool: true, fieldint: 42, fieldstring: String::from("hello"), };

let data = r#"{
    "field_int": 7
}"#;

let patch: ItemPatch = serde_json::from_str(data).unwrap();

item.apply(patch);

assert_eq!(
    item,
    Item {
        field_bool: true,
        field_int: 7,
        field_string: String::from("hello")
    }
);

} ```