Purpur/patches/server/0065-Add-player-death-exp-control-options.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: William Blake Galbreath <blake.galbreath@gmail.com>
Date: Thu, 26 Dec 2019 22:08:37 -0600
Subject: [PATCH] Add player death exp control options


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 1cc9291f14a4d655cb1b91479b954d76cc1fcf7f..ea613f494c9c6fbf1aea40eed5164217072ffdc9 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -194,6 +194,8 @@ public abstract class Player extends LivingEntity {
     // CraftBukkit end
 
     // Purpur start
+    private javax.script.ScriptEngine scriptEngine = new javax.script.ScriptEngineManager().getEngineByName("rhino");
+
     public void setAfk(boolean afk) {
     }
 
@@ -1888,9 +1890,18 @@ public abstract class Player extends LivingEntity {
     @Override
     protected int getExperienceReward(Player player) {
         if (!this.level.getGameRules().getBoolean(GameRules.RULE_KEEPINVENTORY) && !this.isSpectator()) {
-            int i = this.experienceLevel * 7;
-
-            return i > 100 ? 100 : i;
+            // Purpur start
+            int toDrop;
+            try {
+                scriptEngine.eval("expLevel = " + experienceLevel);
+                scriptEngine.eval("expTotal = " + totalExperience);
+                scriptEngine.eval("exp = " + experienceProgress);
+                toDrop = (int) Math.round((Double) scriptEngine.eval(level.purpurConfig.playerDeathExpDropEquation));
+            } catch (Exception ignore) {
+                toDrop = experienceLevel * 7;
+            }
+            return Math.min(toDrop, level.purpurConfig.playerDeathExpDropMax);
+            // Purpur end
         } else {
             return 0;
         }
diff --git a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
index be27a1c47d17992cfc7927fc5f0e5df23a225d96..d993ddd69022f4d9d9ceb3c449fde504419d1709 100644
--- a/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
+++ b/src/main/java/net/pl3x/purpur/PurpurWorldConfig.java
@@ -157,6 +157,13 @@ public class PurpurWorldConfig {
         tridentLoyaltyVoidReturnHeight = getDouble("gameplay-mechanics.trident-loyalty-void-return-height", tridentLoyaltyVoidReturnHeight);
     }
 
+    public String playerDeathExpDropEquation = "expLevel * 7";
+    public int playerDeathExpDropMax = 100;
+    private void playerDeathExpSettings() {
+        playerDeathExpDropEquation = getString("gameplay-mechanics.player.exp-dropped-on-death.equation", playerDeathExpDropEquation);
+        playerDeathExpDropMax = getInt("gameplay-mechanics.player.exp-dropped-on-death.maximum", playerDeathExpDropMax);
+    }
+
     public int playerSpawnInvulnerableTicks = 60;
     public boolean playerInvulnerableWhileAcceptingResourcePack = false;
     private void playerInvulnerabilities() {