Update for 1.20.2 (untested)

build.gradle.kts

@@ -3,8 +3,8 @@ import xyz.jpenilla.runpaper.task.RunServer
 plugins {
     id("java")
     id("com.github.johnrengelman.shadow") version "8.1.1"
-    id("io.papermc.paperweight.userdev") version "1.5.5"
+    id("io.papermc.paperweight.userdev") version "1.5.7"
-    id("xyz.jpenilla.run-paper") version "2.1.0"
+    id("xyz.jpenilla.run-paper") version "2.2.0"
     id("net.minecrell.plugin-yml.bukkit") version "0.6.0"
 }
 
@@ -70,7 +70,7 @@ bukkit {
 
 // Adapted from PlotSquared
 val supportedVersions =
-        listOf("1.17.1", "1.18.1", "1.18.2", "1.19", "1.19.1", "1.19.2", "1.19.3", "1.19.4", "1.20", "1.20.1")
+        listOf("1.17.1", "1.18.1", "1.18.2", "1.19", "1.19.1", "1.19.2", "1.19.3", "1.19.4", "1.20", "1.20.1", "1.20.2")
 tasks {
     supportedVersions.forEach {
         register<RunServer>("runServer-$it") {
@@ -99,11 +99,12 @@ tasks {
 
 dependencies {
     paperDevBundle("1.20.1-R0.1-SNAPSHOT")
-    compileOnly("io.papermc.paper:paper-api:1.20.1-R0.1-SNAPSHOT")
+    compileOnly("io.papermc.paper:paper-api:1.20.2-R0.1-SNAPSHOT")
-    compileOnly("net.coreprotect:coreprotect:21.3")
+    compileOnly("net.coreprotect:coreprotect:22.2")
     implementation("org.bstats:bstats-base:3.0.2")
     implementation("org.bstats:bstats-bukkit:3.0.2")
     implementation(project(path = ":shared", configuration = "shadow"))
+    implementation(project(path = ":v1_20_R2", configuration = "shadow"))
     implementation(project(path = ":v1_20_R1", configuration = "shadow"))
     implementation(project(path = ":v1_19_R3", configuration = "shadow"))
     implementation(project(path = ":v1_19_R2", configuration = "shadow"))

settings.gradle.kts

@@ -4,6 +4,7 @@ plugins {
 
 rootProject.name = "ItemizerX"
 include("shared")
+include("v1_20_R2")
 include("v1_20_R1")
 include("v1_19_R3")
 include("v1_19_R2")

shared/build.gradle.kts

@@ -1,5 +1,5 @@
 dependencies {
-    compileOnly("io.papermc.paper:paper-api:1.20.1-R0.1-SNAPSHOT")
+    compileOnly("io.papermc.paper:paper-api:1.20.2-R0.1-SNAPSHOT")
-    paperDevBundle("1.20.1-R0.1-SNAPSHOT")
+    paperDevBundle("1.20.2-R0.1-SNAPSHOT")
-    compileOnly("net.coreprotect:coreprotect:21.3")
+    compileOnly("net.coreprotect:coreprotect:22.2")
 }

src/main/java/dev/plex/itemizerx/ItemizerX.java

@@ -25,6 +25,11 @@ public class ItemizerX extends JavaPlugin
         getCommand("itemizer").setTabCompleter(new ItemizerXTab());
         switch (getNMSVersion())
         {
+            case "v1_20_R2" ->
+            {
+                getCommand("itemizer").setExecutor(new ItemizerXCommand());
+                attr = new dev.plex.itemizerx.v1_20_R2.AttributeManager();
+            }
             case "v1_20_R1" ->
             {
                 getCommand("itemizer").setExecutor(new ItemizerXCommand());

v1_20_R2/.gitignore

@@ -0,0 +1,42 @@
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

v1_20_R2/build.gradle.kts

@@ -0,0 +1,3 @@
+dependencies {
+    paperDevBundle("1.20.2-R0.1-SNAPSHOT")
+}

v1_20_R2/src/main/java/dev/plex/itemizerx/v1_20_R2/AttributeManager.java

@@ -0,0 +1,161 @@
+package dev.plex.itemizerx.v1_20_R2;
+
+import dev.plex.itemizerx.Attributes;
+import dev.plex.itemizerx.IAttributeManager;
+import net.kyori.adventure.text.minimessage.MiniMessage;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.nbt.ListTag;
+import net.minecraft.nbt.Tag;
+import net.minecraft.world.item.ItemStack;
+import org.apache.commons.lang3.StringUtils;
+import org.bukkit.craftbukkit.v1_20_R2.inventory.CraftItemStack;
+import org.bukkit.entity.Player;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public class AttributeManager implements IAttributeManager
+{
+    private final MiniMessage mm = MiniMessage.miniMessage();
+
+    @Override
+    public ListTag getAttrList(final ItemStack item)
+    {
+        ListTag attrmod = item.getOrCreateTag().getList("AttributeModifiers", 10);
+        if (attrmod == null)
+        {
+            item.getTag().put("AttributeModifiers", new CompoundTag());
+        }
+        return item.getTag().getList("AttributeModifiers", 10);
+    }
+
+    @Override
+    public void addAttr(final Player player, final String[] args)
+    {
+        int op;
+        if (args.length < 4)
+        {
+            player.sendMessage(mm.deserialize("<aqua>/itemizer attr add <<white>name<aqua>> <<white>strength<aqua>>" +
+                    "[<white>slot<aqua>] <red>- <gold>Add an attribute"));
+            return;
+        }
+        final Attributes a = Attributes.get(args[2]);
+        if (a == null)
+        {
+            player.sendMessage(mm.deserialize("<dark_red>\"" + args[2] + "\" is not a valid attribute type."));
+            return;
+        }
+        double amount;
+        try
+        {
+            amount = Double.parseDouble(args[3]);
+        }
+        catch (NumberFormatException ex)
+        {
+            player.sendMessage(mm.deserialize("<dark_red>\"" + args[3] + "\" is not a valid number."));
+            return;
+        }
+        if (Double.isNaN(amount))
+        {
+            player.sendMessage(mm.deserialize("<dark_red>Please do not use <white>'NaN (Not a Number)'"));
+            return;
+        }
+        final ItemStack nms = CraftItemStack.asNMSCopy(player.getInventory().getItemInMainHand());
+        final ListTag attrmod = getAttrList(nms);
+        for (Tag nbtBase : attrmod)
+        {
+            final CompoundTag c = (CompoundTag) nbtBase;
+            if (c.getString("Name").equals(args[2]))
+            {
+                player.sendMessage(mm.deserialize("<dark_red>An attribute with the name \"<white>" + args[2] + "<dark_red>\" already exists!"));
+                return;
+            }
+        }
+        final CompoundTag c = new CompoundTag();
+        c.putString("Name", args[2]);
+        c.putString("AttributeName", a.mcName);
+        c.putDouble("Amount", amount);
+        op = a.op;
+        c.putInt("Operation", op);
+        final Random random = new Random();
+        c.putIntArray("UUID", new int[]
+                {
+                        random.nextInt(),
+                        random.nextInt(),
+                        random.nextInt(),
+                        random.nextInt()
+                });
+        if (args.length == 5)
+        {
+            final List<String> options = new ArrayList<>();
+            options.add("mainhand");
+            options.add("offhand");
+            options.add("head");
+            options.add("chest");
+            options.add("legs");
+            options.add("feet");
+            if (!options.contains(args[4].toLowerCase()))
+            {
+                player.sendMessage(mm.deserialize("<dark_green>Supported options:"));
+                player.sendMessage(mm.deserialize("<yellow>" + StringUtils.join(options, ", ")));
+                return;
+            }
+            c.putString("Slot", args[4].toLowerCase());
+        }
+        attrmod.add(c);
+        nms.getTag().put("AttributeModifiers", attrmod);
+        final org.bukkit.inventory.ItemStack is = CraftItemStack.asCraftMirror(nms);
+        player.getInventory().setItemInMainHand(is);
+        player.sendMessage(mm.deserialize("<dark_aqua>Attribute added!"));
+    }
+
+    @Override
+    public void removeAttr(final Player player, final String string)
+    {
+        final ItemStack nms = CraftItemStack.asNMSCopy(player.getInventory().getItemInMainHand());
+        final ListTag attrmod = getAttrList(nms);
+        final ListTag newList = new ListTag();
+        boolean r = false;
+        for (Tag nbtBase : attrmod)
+        {
+            final CompoundTag c = (CompoundTag) nbtBase;
+            if (!c.getString("Name").equals(string))
+            {
+                newList.add(nbtBase);
+            }
+            else
+            {
+                r = true;
+            }
+        }
+        if (!r)
+        {
+            player.sendMessage(mm.deserialize("<dark_red>The attribute \"" + string + "\" doesn't exist!"));
+            return;
+        }
+        nms.getTag().put("AttributeModifiers", newList);
+        final org.bukkit.inventory.ItemStack is = CraftItemStack.asCraftMirror(nms);
+        player.getInventory().setItemInMainHand(is);
+        player.sendMessage(mm.deserialize("<dark_green>Attribute removed!"));
+    }
+
+    @Override
+    public void listAttr(final Player player)
+    {
+        final ItemStack nms = CraftItemStack.asNMSCopy(player.getInventory().getItemInMainHand());
+        final ListTag attrmod = getAttrList(nms);
+        if (attrmod.size() == 0)
+        {
+            player.sendMessage(mm.deserialize("<yellow>This item has no attributes."));
+            return;
+        }
+        player.sendMessage(mm.deserialize("<dark_green>Item attributes: "));
+        for (Tag nbtBase : attrmod)
+        {
+            final CompoundTag c = (CompoundTag) nbtBase;
+            player.sendMessage(mm.deserialize("<yellow>" + Attributes.get(c.getString("AttributeName")).mcName
+                    + ", " + c.getDouble("Amount")));
+        }
+    }
+}