From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 18 Jun 2018 01:12:53 -0400
Subject: [PATCH] PlayerReadyArrowEvent

Called when a player is firing a bow and the server is choosing an arrow to use.
Plugins can skip selection of certain arrows and control which is used.

diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
index 220a1c4ecf9bc95c804a831fb661aa28f00059b1..157abba796981cf2d1b0b17ccd376de10c782a30 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -2184,6 +2184,17 @@ public abstract class Player extends LivingEntity {
         return ImmutableList.of(Pose.STANDING, Pose.CROUCHING, Pose.SWIMMING);
     }
 
+    // Paper start
+    protected boolean tryReadyArrow(ItemStack bow, ItemStack itemstack) {
+        return !(this instanceof ServerPlayer) ||
+                new com.destroystokyo.paper.event.player.PlayerReadyArrowEvent(
+                    ((ServerPlayer) this).getBukkitEntity(),
+                    org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(bow),
+                    org.bukkit.craftbukkit.inventory.CraftItemStack.asCraftMirror(itemstack)
+                ).callEvent();
+        // Paper end
+    }
+
     @Override
     public ItemStack getProjectile(ItemStack stack) {
         if (!(stack.getItem() instanceof ProjectileWeaponItem)) {
@@ -2200,7 +2211,7 @@ public abstract class Player extends LivingEntity {
                 for (int i = 0; i < this.inventory.getContainerSize(); ++i) {
                     ItemStack itemstack2 = this.inventory.getItem(i);
 
-                    if (predicate.test(itemstack2)) {
+                    if (predicate.test(itemstack2) && tryReadyArrow(stack, itemstack2)) { // Paper
                         return itemstack2;
                     }
                 }