Add predicate api support

Author: MattiDragon

src/main/java/io/github/mattidragon/demobox/DemoBox.java

@@ -1,5 +1,6 @@
 package io.github.mattidragon.demobox;
 
+import eu.pb4.predicate.api.PredicateRegistry;
 import net.fabricmc.api.ModInitializer;
 import net.minecraft.util.Identifier;
 import org.slf4j.Logger;
@@ -16,5 +17,6 @@ public static Identifier id(String path) {
     @Override
     public void onInitialize() {
         DemoBoxCommand.register();
+        PredicateRegistry.register(DemoBoxPredicate.ID, DemoBoxPredicate.CODEC);
     }
 }

src/main/java/io/github/mattidragon/demobox/DemoBoxPredicate.java

@@ -0,0 +1,28 @@
+package io.github.mattidragon.demobox;
+
+import com.mojang.serialization.MapCodec;
+import eu.pb4.predicate.api.AbstractPredicate;
+import eu.pb4.predicate.api.PredicateContext;
+import eu.pb4.predicate.api.PredicateResult;
+import net.minecraft.util.Identifier;
+import xyz.nucleoid.plasmid.game.manager.GameSpaceManager;
+
+public class DemoBoxPredicate extends AbstractPredicate {
+    public static final Identifier ID = DemoBox.id("in_demo");
+    public static final DemoBoxPredicate INSTANCE = new DemoBoxPredicate();
+    public static final MapCodec<DemoBoxPredicate> CODEC = MapCodec.unit(INSTANCE);
+
+    public DemoBoxPredicate() {
+        super(ID, CODEC);
+    }
+
+    @Override
+    public PredicateResult<?> test(PredicateContext context) {
+        var world = context.world();
+        if (world == null) return PredicateResult.ofFailure();
+        var gameSpace = GameSpaceManager.get().byWorld(world);
+        if (gameSpace == null) return PredicateResult.ofFailure();
+        if (gameSpace.getMetadata().sourceConfig().type() != DemoBoxGame.TYPE) return PredicateResult.ofFailure();
+        return PredicateResult.ofSuccess();
+    }
+}