Purpur/patches/server/0051-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/net/minecraft/world/entity/player/Player.java b/net/minecraft/world/entity/player/Player.java
index 2f69a511db8d43fbd3a17387cded1d3573579fce..8ccc760e84aec8aabbe5b8112b332cee13849b23 100644
--- a/net/minecraft/world/entity/player/Player.java
+++ b/net/minecraft/world/entity/player/Player.java
@@ -1924,7 +1924,23 @@ public abstract class Player extends LivingEntity {
 
     @Override
     protected int getBaseExperienceReward(ServerLevel world) {
-        return !world.getGameRules().getBoolean(GameRules.RULE_KEEPINVENTORY) && !this.isSpectator() ? Math.min(this.experienceLevel * 7, 100) : 0;
+        // Purpur start
+        if (!world.getGameRules().getBoolean(GameRules.RULE_KEEPINVENTORY) && !this.isSpectator()) {
+            int toDrop;
+            try {
+                toDrop = Math.round(((Number) scriptEngine.eval("let expLevel = " + experienceLevel + "; " +
+                    "let expTotal = " + totalExperience + "; " +
+                    "let exp = " + experienceProgress + "; " +
+                    level().purpurConfig.playerDeathExpDropEquation)).floatValue());
+            } catch (javax.script.ScriptException e) {
+                e.printStackTrace();
+                toDrop = experienceLevel * 7;
+            }
+            return Math.min(toDrop, level().purpurConfig.playerDeathExpDropMax);
+        } else {
+            return 0;
+        }
+        // Purpur end
     }
 
     @Override
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index 8b2d9b592ef0f90df0c623595fb425e4f37d0c04..f62000475acb9e48f3c86c6ed267ed3b2038529a 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -172,6 +172,8 @@ public class PurpurWorldConfig {
     public boolean idleTimeoutCountAsSleeping = false;
     public boolean idleTimeoutUpdateTabList = false;
     public boolean idleTimeoutTargetPlayer = true;
+    public String playerDeathExpDropEquation = "expLevel * 7";
+    public int playerDeathExpDropMax = 100;
     private void playerSettings() {
         if (PurpurConfig.version < 19) {
             boolean oldVal = getBoolean("gameplay-mechanics.player.idle-timeout.mods-target", idleTimeoutTargetPlayer);
@@ -183,6 +185,8 @@ public class PurpurWorldConfig {
         idleTimeoutCountAsSleeping = getBoolean("gameplay-mechanics.player.idle-timeout.count-as-sleeping", idleTimeoutCountAsSleeping);
         idleTimeoutUpdateTabList = getBoolean("gameplay-mechanics.player.idle-timeout.update-tab-list", idleTimeoutUpdateTabList);
         idleTimeoutTargetPlayer = getBoolean("gameplay-mechanics.player.idle-timeout.mobs-target", idleTimeoutTargetPlayer);
+        playerDeathExpDropEquation = getString("gameplay-mechanics.player.exp-dropped-on-death.equation", playerDeathExpDropEquation);
+        playerDeathExpDropMax = getInt("gameplay-mechanics.player.exp-dropped-on-death.maximum", playerDeathExpDropMax);
     }
 
     public boolean silkTouchEnabled = false;