show git hash in game (#33)

src/debug.rs

@@ -1,8 +1,11 @@
 use bevy::prelude::*;
 use bevy_debug_log::LogViewerVisibility;
 
+pub const GIT_HASH: &str = env!("VERGEN_GIT_SHA");
+
 pub fn plugin(app: &mut App) {
     app.add_systems(Update, update);
+    app.add_systems(Startup, setup);
 }
 
 fn update(mut commands: Commands, keyboard: Res<ButtonInput<KeyCode>>) {
@@ -10,3 +13,21 @@ fn update(mut commands: Commands, keyboard: Res<ButtonInput<KeyCode>>) {
         commands.trigger(LogViewerVisibility::Toggle);
     }
 }
+
+fn setup(mut commands: Commands) {
+    commands.spawn((
+        Name::new("githash-ui"),
+        Text::new(GIT_HASH),
+        TextFont {
+            font_size: 12.0,
+            ..default()
+        },
+        TextLayout::new_with_justify(JustifyText::Left),
+        Node {
+            position_type: PositionType::Absolute,
+            top: Val::Px(5.0),
+            left: Val::Px(5.0),
+            ..default()
+        },
+    ));
+}