nano9 0.1.0-alpha.3

A Pico-8 compatibility layer for Bevy
Documentation 
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use bevy::prelude::*;

#[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, Default, States, Reflect)]
pub enum RunState {
    #[default]
    Uninit,
    Loaded,
    Init,
    Run,
    Pause,
    /// Error messages
    ///
    /// XXX: Change name to suit.
    Messages,
}

#[derive(Debug, Resource, Default, Deref, DerefMut)]
pub struct Steps(Option<u32>);

pub(crate) fn plugin(app: &mut App) {
    app
        .init_state::<RunState>()
        .init_resource::<Steps>()
        .add_systems(Last, pause_after_steps);
}

fn pause_after_steps(run_state: Res<State<RunState>>,
                     mut next_run_state: ResMut<NextState<RunState>>,
                     mut steps: ResMut<Steps>) {
    if **run_state == RunState::Run {
        if let Some(ref mut count) = &mut steps.0 {
            if *count <= 1 {
                steps.0 = None;
                next_run_state.set(RunState::Pause);
            } else {
                *count -= 1;
            }
        }
    }
}