bevy_mod_config 0.1.0

A Bevy plugin for configuration management
Documentation 
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use core::ops::{Deref, DerefMut};

use bevy_ecs::bundle::Bundle;
use bevy_ecs::resource::Resource;

#[cfg(feature = "egui")]
pub mod egui;
#[cfg(feature = "egui")]
pub use egui::Egui;

#[cfg(feature = "serde")]
pub mod serde;
#[cfg(feature = "serde")]
pub use serde::Serde;

/// Manages config fields.
///
/// A manager is invoked when a scalar config field is spawned in the world,
/// allowing it to attach behavior to the entity.
pub trait Manager: Sized + Send + Sync + 'static {
    /// Returns a component bundle that tracks entity management.
    fn new_entity<T>(&mut self) -> impl Bundle
    where
        Self: Supports<T>,
    {
        self.new_entity_for_type()
    }
}

/// Marks that a [`Manager`] type supports handling config fields of scalar type `T`.
pub trait Supports<T>: Manager {
    /// Returns a component bundle that tracks entity management for the scalar type `T`.
    fn new_entity_for_type(&mut self) -> impl Bundle;
}

#[derive(Resource)]
pub struct Instance<M: Manager> {
    pub instance: M,
}

impl<M: Manager> Deref for Instance<M> {
    type Target = M;

    fn deref(&self) -> &M { &self.instance }
}

impl<M: Manager> DerefMut for Instance<M> {
    fn deref_mut(&mut self) -> &mut M { &mut self.instance }
}

macro_rules! impl_manager {
    ($(($n:tt, $M:ident)),*) => {
        impl<$($M),*> Manager for ($($M,)*)
        where
            $($M: Manager),*
        {}

        impl<T, $($M: Send + Sync + 'static),*> Supports<T> for ($($M,)*)
        where
            $($M: Supports<T>),*
        {
            fn new_entity_for_type(&mut self) -> impl Bundle {
                #[allow(clippy::unused_unit)]
                (
                    $(
                        self.$n.new_entity_for_type(),
                    )*
                )
            }
        }
    };
}

variadics_please::all_tuples_enumerated!(impl_manager, 0, 8, T);