remove markers when app unloads or not loaded

src/main/java/carpet/mixins/ArmorStandEntity_scarpetMarkerMixin.java

@@ -0,0 +1,55 @@
+package carpet.mixins;
+
+import carpet.CarpetServer;
+import carpet.script.ExpressionInspector;
+import carpet.settings.CarpetSettings;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.LivingEntity;
+import net.minecraft.entity.decoration.ArmorStandEntity;
+import net.minecraft.world.World;
+import org.apache.commons.lang3.StringUtils;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+import java.util.Optional;
+
+@Mixin(ArmorStandEntity.class)
+public abstract class ArmorStandEntity_scarpetMarkerMixin extends LivingEntity
+{
+    protected ArmorStandEntity_scarpetMarkerMixin(EntityType<? extends LivingEntity> entityType_1, World world_1)
+    {
+        super(entityType_1, world_1);
+    }
+
+    /**
+     * Remove all markers that do not belong to any script host and not part of the global one when loaded
+     * @param ci
+     */
+    @Inject(method = "readCustomDataFromTag", at = @At("HEAD"))
+    private void checkScarpetMarkerUnloaded(CallbackInfo ci)
+    {
+        if ((CarpetSettings.scriptsAutoload || CarpetSettings.commandScript) && !world.isClient)
+        {
+            if (getScoreboardTags().contains(ExpressionInspector.MARKER_STRING))
+            {
+                String prefix = ExpressionInspector.MARKER_STRING+"_";
+                Optional<String> owner = getScoreboardTags().stream().filter(s -> s.startsWith(prefix)).findFirst();
+                if (owner.isPresent())
+                {
+                    String hostName = StringUtils.removeStart(owner.get(),prefix);
+                    if (!hostName.isEmpty() && CarpetServer.scriptServer.getHostByName(hostName) == null)
+                    {
+                        remove();
+                    }
+
+                }
+                else
+                {
+                    remove();
+                }
+            }
+        }
+    }
+}