(autoformat)

Oops. Yay for rushed work.

src/game/mod.rs

@@ -43,7 +43,7 @@ pub mod consumables {
 
   impl Default for Fuel {
     fn default() -> Self {
-        Self(5)
+      Self(5)
     }
   }
   #[derive(Event)]

src/main.rs

@@ -2,9 +2,7 @@ use bevy::{color::palettes::css::*, prelude::*, window::WindowResolution};
 use bevy_inspector_egui::{bevy_egui::EguiPlugin, quick::WorldInspectorPlugin};
 
 use crate::{
-  game::{
-    machines::{CuttingMachine, FlippingMachine, RotatingMachine, TransposingMachine},
-  },
+  game::machines::{CuttingMachine, FlippingMachine, RotatingMachine, TransposingMachine},
   resources::UiTheme,
   widgets::SpawnUi,
 };

src/widgets/fuel_gauge.rs

@@ -1,9 +1,15 @@
-use bevy::{color::palettes::css::*, prelude::*, ui::Val::*};
+use bevy::{
+  color::palettes::css::*,
+  ecs::{component::HookContext, world::DeferredWorld},
+  prelude::*,
+  ui::Val::*,
+};
 
 use crate::game::consumables::{Fuel, FuelChanged};
 
 #[derive(Component)]
 #[require(Label)]
+#[component(on_add = FuelGauge::refresh_label)]
 pub struct FuelGauge(Entity);
 
 impl FuelGauge {
@@ -41,4 +47,23 @@ impl FuelGauge {
     );
     label.0 = format!("Fuel: {}", fuel.0);
   }
+
+  fn refresh_label(mut world: DeferredWorld, ctx: HookContext) {
+    // Get the machine ID from the FuelGauge component.
+    let Some(machine_id) = world.get::<FuelGauge>(ctx.entity).map(|fg| fg.0) else {
+      panic!("Couldn't get a FuelGauge during it's on-add hook run!");
+    };
+    // and fuel level
+    let Some(fuel) = world.get::<Fuel>(machine_id).map(|lvl| lvl.0) else {
+      // TODO: Maybe don't panic and just emit a warning.
+      panic!("Couldn't get a Fuel for a machine during a FuelGauge on-add hook.");
+    };
+
+    // Get an excl ref to the Text component so we can redraw its text
+    let Some(mut label) = world.get_mut::<Text>(ctx.entity) else {
+      panic!()
+    };
+
+    label.0 = format!("Fuel: {}", fuel);
+  }
 }

src/widgets/machines.rs

@@ -52,7 +52,7 @@ impl SpawnUi for RotatingMachine {
   fn spawn_ui(mut commands: Commands, theme: Res<UiTheme>, machine_id: Entity) {
     let base_entity = machine_ui_base(&mut commands, "Rotating Machine", &theme);
     commands.entity(base_entity).with_children(|commands| {
-      commands.spawn(FuelGauge::bundle(Entity::PLACEHOLDER));
+      commands.spawn(FuelGauge::bundle(machine_id));
 
       // Center panel (placeholder for input-output rotation)
       commands.spawn((
@@ -87,7 +87,7 @@ impl SpawnUi for FlippingMachine {
   fn spawn_ui(mut commands: Commands, theme: Res<UiTheme>, machine_id: Entity) {
     let base_entity = machine_ui_base(&mut commands, "Flipping Machine", &theme);
     commands.entity(base_entity).with_children(|commands| {
-      commands.spawn(FuelGauge::bundle(Entity::PLACEHOLDER));
+      commands.spawn(FuelGauge::bundle(machine_id));
 
       // Center panel (placeholder)
       commands.spawn((
@@ -122,7 +122,7 @@ impl SpawnUi for TransposingMachine {
   fn spawn_ui(mut commands: Commands, theme: Res<UiTheme>, machine_id: Entity) {
     let base_entity = machine_ui_base(&mut commands, "Transposing Machine", &theme);
     commands.entity(base_entity).with_children(|commands| {
-      commands.spawn(FuelGauge::bundle(Entity::PLACEHOLDER));
+      commands.spawn(FuelGauge::bundle(machine_id));
 
       // Center panel (placeholder)
       commands.spawn((