Adds pathfinding condition

src/main/java/ch/njol/skript/conditions/CondIsPathfinding.java

@@ -0,0 +1,105 @@
+/**
+ *   This file is part of Skript.
+ *
+ *  Skript is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Skript is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Skript.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright Peter Güttinger, SkriptLang team and contributors
+ */
+package ch.njol.skript.conditions;
+
+import ch.njol.skript.Skript;
+import ch.njol.skript.conditions.base.PropertyCondition;
+import ch.njol.skript.conditions.base.PropertyCondition.PropertyType;
+import ch.njol.skript.doc.Description;
+import ch.njol.skript.doc.Examples;
+import ch.njol.skript.doc.Name;
+import ch.njol.skript.doc.RequiredPlugins;
+import ch.njol.skript.doc.Since;
+import ch.njol.skript.lang.Condition;
+import ch.njol.skript.lang.Expression;
+import ch.njol.skript.lang.SkriptParser.ParseResult;
+import ch.njol.util.Kleenean;
+
+import com.destroystokyo.paper.entity.Pathfinder;
+import com.destroystokyo.paper.entity.Pathfinder.PathResult;
+
+import org.bukkit.Location;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Mob;
+import org.bukkit.event.Event;
+import org.eclipse.jdt.annotation.Nullable;
+
+@Name("Is Pathfinding")
+@Description({
+	"Checks whether living entities are pathfinding.",
+	"Can only be a living entity that is a Mob."
+})
+@Examples({
+	"make {_entity} pathfind to {_location} at speed 2",
+	"while {_entity} is pathfinding",
+		"\twait a second",
+	"launch flickering trailing burst firework colored red at location of {_entity}",
+	"subtract 10 from {defence::tower::health}",
+	"clear entity within {_entity}"
+})
+@RequiredPlugins("Paper")
+@Since("INSERT VERSION")
+public class CondIsPathfinding extends Condition {
+
+	static {
+		if (Skript.classExists("org.bukkit.entity.Mob") && Skript.methodExists(Mob.class, "getPathfinder"))
+			PropertyCondition.register(CondIsPathfinding.class, "pathfinding [to[wards] %-livingentity/location%]", "livingentities");
+	}
+
+	private Expression<LivingEntity> entities;
+	private Expression<?> target;
+
+	@Override
+	@SuppressWarnings("unchecked")
+	public boolean init(Expression<?>[] expressions, int matchedPattern, Kleenean isDelayed, ParseResult parseResult) {
+		entities = (Expression<LivingEntity>) expressions[0];
+		target = expressions[1];
+		setNegated(matchedPattern == 1);
+		return true;
+	}
+
+	@Override
+	public boolean check(Event event) {
+		return entities.check(event, entity -> {
+			if (!(entity instanceof Mob))
+				return false;
+			Pathfinder pathfind = ((Mob) entity).getPathfinder();
+			if (target == null)
+				return pathfind.hasPath();
+
+			PathResult current = pathfind.getCurrentPath();
+			Object target = this.target.getSingle(event);
+			if (target == null || current == null)
+				return false;
+			Location location = current.getFinalPoint();
+			if (target instanceof Location)
+				return location.equals(target);
+			assert target instanceof LivingEntity;
+			LivingEntity entityTarget = (LivingEntity) target;
+			return location.distance(((Mob) entityTarget).getLocation()) < 1;
+		}, isNegated());
+	}
+
+	@Override
+	public String toString(@Nullable Event event, boolean debug) {
+		return PropertyCondition.toString(this, PropertyType.BE, event, debug, entities, "pathfinding" +
+				target == null ? "" : " to " + target.toString(event, debug));
+	}
+
+}