bevy_persist

Automatic persistence for Bevy resources with change detection.

Features

• Automatic Save/Load: Resources are automatically saved when modified and loaded on startup
• Multiple Formats: Support for JSON and RON serialization formats
• Change Detection: Only saves when resources actually change, minimizing disk I/O
• Derive Macro: Simple #[derive(Persist)] to make any resource persistent
• Flexible Configuration: Customize save paths, formats, and save strategies per resource

Installation

Add to your Cargo.toml:

[dependencies]
bevy_persist = "0.1.0"

Quick Start

use bevy::prelude::*;
use bevy_persist::prelude::*;
use serde::{Deserialize, Serialize};

#[derive(Resource, Default, Serialize, Deserialize, Persist)]
struct Settings {
    volume: f32,
    difficulty: String,
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_plugins(PersistPlugin)
        .init_resource::<Settings>()
        .run();
}

Advanced Usage

Manual Save Control

#[derive(Resource, Serialize, Deserialize, Persist)]
#[persist(auto_save = false)]
struct GraphicsSettings {
    resolution: (u32, u32),
    fullscreen: bool,
}

// Manual save in a system
fn save_graphics(
    mut manager: ResMut<PersistManager>,
    settings: Res<GraphicsSettings>,
) {
    if settings.is_changed() {
        let data = settings.to_persist_data();
        manager.get_persist_file_mut()
            .set_type_data("GraphicsSettings".to_string(), data);
        manager.save().expect("Failed to save");
    }
}

RON Format

Use RON format for more readable configuration files:

App::new()
    .add_plugins(PersistPlugin::new("settings.ron"))
    // ...

Examples

Check out the examples/ directory for more usage examples:

• basic.rs - Simple settings persistence
• advanced.rs - Complex game state with multiple persistent resources

Run examples with:

cargo run --example basic
cargo run --example advanced

License

Licensed under either of:

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.