Revert "clippy fixes"

This reverts commit f6e94cfd32.

src/utils/trail.rs

@@ -0,0 +1,70 @@
+use crate::GameState;
+use bevy::prelude::*;
+
+#[derive(Component)]
+pub struct Trail {
+    points: Vec<Vec3>,
+    col_start: LinearRgba,
+    col_end: LinearRgba,
+}
+
+impl Trail {
+    pub fn new(points: usize, col_start: LinearRgba, col_end: LinearRgba) -> Self {
+        Self {
+            points: Vec::with_capacity(points),
+            col_start,
+            col_end,
+        }
+    }
+
+    pub fn with_pos(self, pos: Vec3) -> Self {
+        let mut trail = self;
+        trail.add(pos);
+        trail
+    }
+
+    pub fn add(&mut self, pos: Vec3) {
+        if self.points.len() >= self.points.capacity() {
+            self.points.pop();
+        }
+        self.points.insert(0, pos);
+    }
+}
+
+pub fn plugin(app: &mut App) {
+    app.add_systems(
+        FixedUpdate,
+        update_trail.run_if(in_state(GameState::Playing)),
+    );
+}
+
+fn update_trail(
+    mut query: Query<(Entity, &mut Trail, &Gizmo, &GlobalTransform)>,
+    global_transform: Query<&GlobalTransform>,
+    mut gizmo_assets: ResMut<Assets<GizmoAsset>>,
+) -> Result {
+    for (e, mut trail, gizmo, pos) in query.iter_mut() {
+        trail.add(pos.translation());
+
+        let parent_transform = global_transform.get(e)?;
+
+        let Some(gizmo) = gizmo_assets.get_mut(gizmo.handle.id()) else {
+            continue;
+        };
+
+        gizmo.clear();
+
+        let lerp_denom = trail.points.len() as f32;
+
+        gizmo.linestrip_gradient(trail.points.iter().enumerate().map(|(i, pos)| {
+            (
+                GlobalTransform::from_translation(*pos)
+                    .reparented_to(parent_transform)
+                    .translation,
+                trail.col_start.mix(&trail.col_end, i as f32 / lerp_denom),
+            )
+        }));
+    }
+
+    Ok(())
+}