Rework dibs into hivemind

Imperfect, will require tweaking.

core/src/mindustry/entities/type/base/CraterUnit.java

@@ -13,6 +13,7 @@ import mindustry.graphics.*;
 import arc.scene.ui.layout.*;
 import mindustry.entities.units.*;
 import mindustry.game.EventType.*;
+import mindustry.entities.traits.*;
 import mindustry.entities.Effects.*;
 import mindustry.world.blocks.distribution.PlastaniumConveyor.*;
 
@@ -21,6 +22,7 @@ import static mindustry.Vars.*;
 public class CraterUnit extends GroundUnit{
     private final Effect io = Fx.plasticburn; // effect to play when poofing in and out of existence
     private int inactivity = 0;
+    public TargetTrait purpose;
 
     private final UnitState
 
@@ -39,15 +41,13 @@ public class CraterUnit extends GroundUnit{
                 return;
             }
 
-            // compute a destination
-            Tile target = on().front();
-            if(!dibs(target)) target = on();
-
-            if(dst(target) > 1f){ // move to target...
-                velocity.add(vec.trnsExact(angleTo(target), type.speed * Time.delta()));
-            }else{ // ...but snap on its center
-                x = Mathf.lerp(x, target.drawx(), 0.01f);
-                y = Mathf.lerp(y, target.drawy(), 0.01f);
+            if(purpose != null){
+                if(dst(purpose) > 1f){ // move to target...
+                    velocity.add(vec.trnsExact(angleTo(purpose), type.speed * Time.delta()));
+                }else{ // ...but snap on its center
+                    x = Mathf.lerp(x, purpose.getX(), 0.01f);
+                    y = Mathf.lerp(y, purpose.getY(), 0.01f);
+                }
             }
 
             rotation = Mathf.slerpDelta(rotation, angleTo(on().front()), type.rotatespeed);
@@ -71,31 +71,6 @@ public class CraterUnit extends GroundUnit{
         }
     };
 
-    // ensures (well, tries to make sure) that each crater has one tile to itself
-    private boolean dibs(Tile tile){
-        if(!tile.block().compressable) return false;
-
-        // invalidate existing dibs
-        if(Track.dibs.containsKey(tile)){
-            if(Track.dibs.get(tile).isDead() || Track.dibs.get(tile).dst(tile) > tilesize) Track.dibs.remove(tile);
-        }
-
-        // instantly claim unclaimed tiles
-        if(!Track.dibs.containsKey(tile)){
-            Track.dibs.remove(on());
-            Track.dibs.put(tile, this);
-            return true;
-        }
-
-        // tile is claimed by current unit
-        if(Track.dibs.get(tile) == this){
-            return true;
-        }
-
-        // various reasons
-        return false;
-    }
-
     @Override
     public UnitState getStartState(){
         return load;
@@ -116,6 +91,8 @@ public class CraterUnit extends GroundUnit{
             Effects.effect(io, x, y); // poof out of existence
             kill();
         }
+
+        Hivemind.update();
     }
 
     @Override
@@ -152,6 +129,12 @@ public class CraterUnit extends GroundUnit{
         return world.ltileWorld(x, y);
     }
 
+    public Tile aspires(){ // what purpose this crater aspires to
+        if(on(Track.end)) return on();
+
+        return on().front();
+    }
+
     private void drawBackItems(){
         if(item.amount == 0) return;
 
@@ -203,4 +186,9 @@ public class CraterUnit extends GroundUnit{
 
         return Mathf.round(type.itemCapacity * on().entity.timeScale);
     }
+
+    @Override
+    public void updateTargeting(){
+        super.updateTargeting();
+    }
 }

core/src/mindustry/entities/units/Hivemind.java

@@ -0,0 +1,27 @@
+package mindustry.entities.units;
+
+import arc.*;
+import arc.util.*;
+import arc.struct.*;
+import mindustry.entities.*;
+import mindustry.entities.type.base.*;
+
+import static mindustry.Vars.unitGroup;
+
+public class Hivemind{
+    private static long lastFrameUpdated = -1;
+    private static Interval timer = new Interval(1);
+
+    public static void update(){
+        if(Core.graphics.getFrameId() == lastFrameUpdated) return;
+        lastFrameUpdated = Core.graphics.getFrameId();
+        if(!timer.get(30)) return;
+
+        ObjectSet<CraterUnit> craters = new ObjectSet<>();
+        unitGroup.all().each(e -> e instanceof CraterUnit, crater -> craters.add((CraterUnit)crater));
+
+        craters.each(crater -> {
+            crater.purpose = Units.anyEntities(crater.aspires()) ? crater.on() : crater.aspires();
+        });
+    }
+}

core/src/mindustry/world/blocks/distribution/PlastaniumConveyor.java

@@ -2,7 +2,6 @@ package mindustry.world.blocks.distribution;
 
 import arc.*;
 import arc.func.*;
-import arc.struct.*;
 import mindustry.type.*;
 import mindustry.world.*;
 import arc.graphics.g2d.*;
@@ -130,7 +129,5 @@ public class PlastaniumConveyor extends ArmoredConveyor{
         Track(Boolf<Tile> check){
             this.check = check;
         }
-
-        public static ObjectMap<Tile, CraterUnit> dibs = new ObjectMap<>(); // fixme: race conditions on world load
     }
 }