From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Sweepyoface <github@sweepy.pw>
Date: Sat, 17 Jun 2017 18:48:21 -0400
Subject: [PATCH] Add UnknownCommandEvent

Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>

diff --git a/src/main/java/net/minecraft/commands/CommandSourceStack.java b/src/main/java/net/minecraft/commands/CommandSourceStack.java
index f6938c35ac6f6116084d3e7ec9cdc918f20b6f61..edf49f2d9921b4517fb98929d842f7a62c5549df 100644
--- a/src/main/java/net/minecraft/commands/CommandSourceStack.java
+++ b/src/main/java/net/minecraft/commands/CommandSourceStack.java
@@ -334,8 +334,13 @@ public class CommandSourceStack implements ExecutionCommandSource<CommandSourceS
     }
 
     public void sendFailure(Component message) {
+        // Paper start - Add UnknownCommandEvent
+        this.sendFailure(message, true);
+    }
+    public void sendFailure(Component message, boolean withStyle) {
+        // Paper end - Add UnknownCommandEvent
         if (this.source.acceptsFailure() && !this.silent) {
-            this.source.sendSystemMessage(Component.empty().append(message).withStyle(ChatFormatting.RED));
+            this.source.sendSystemMessage(withStyle ? Component.empty().append(message).withStyle(ChatFormatting.RED) : message); // Paper - Add UnknownCommandEvent
         }
 
     }
diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
index 495a7b713a7ab9c19aad34512b76523bad43b89d..15a5059994371da4850adcf726034a715b80efba 100644
--- a/src/main/java/net/minecraft/commands/Commands.java
+++ b/src/main/java/net/minecraft/commands/Commands.java
@@ -152,6 +152,7 @@ public class Commands {
     public static final int LEVEL_ADMINS = 3;
     public static final int LEVEL_OWNERS = 4;
     private final com.mojang.brigadier.CommandDispatcher<CommandSourceStack> dispatcher = new com.mojang.brigadier.CommandDispatcher();
+    public final java.util.List<CommandNode<CommandSourceStack>> vanillaCommandNodes = new java.util.ArrayList<>(); // Paper - Add UnknownCommandEvent
 
     public Commands(Commands.CommandSelection environment, CommandBuildContext commandRegistryAccess) {
         this(); // CraftBukkit
@@ -254,6 +255,7 @@ public class Commands {
         if (environment.includeIntegrated) {
             PublishCommand.register(this.dispatcher);
         }
+        this.vanillaCommandNodes.addAll(this.dispatcher.getRoot().getChildren()); // Paper - Add UnknownCommandEvent
 
         // CraftBukkit start
     }
@@ -328,7 +330,7 @@ public class Commands {
         commandlistenerwrapper.getServer().getProfiler().push(() -> {
             return "/" + s;
         });
-        ContextChain contextchain = Commands.finishParsing(parseresults, s, commandlistenerwrapper, label); // CraftBukkit
+        ContextChain contextchain = this.finishParsing(parseresults, s, commandlistenerwrapper, label); // CraftBukkit // Paper - Add UnknownCommandEvent
 
         try {
             if (contextchain != null) {
@@ -362,14 +364,23 @@ public class Commands {
     }
 
     @Nullable
-    private static ContextChain<CommandSourceStack> finishParsing(ParseResults<CommandSourceStack> parseresults, String s, CommandSourceStack commandlistenerwrapper, String label) { // CraftBukkit
+    private ContextChain<CommandSourceStack> finishParsing(ParseResults<CommandSourceStack> parseresults, String s, CommandSourceStack commandlistenerwrapper, String label) { // CraftBukkit // Paper - Add UnknownCommandEvent
         try {
             Commands.validateParseResults(parseresults);
             return (ContextChain) ContextChain.tryFlatten(parseresults.getContext().build(s)).orElseThrow(() -> {
                 return CommandSyntaxException.BUILT_IN_EXCEPTIONS.dispatcherUnknownCommand().createWithContext(parseresults.getReader());
             });
         } catch (CommandSyntaxException commandsyntaxexception) {
-            commandlistenerwrapper.sendFailure(ComponentUtils.fromMessage(commandsyntaxexception.getRawMessage()));
+            // Paper start - Add UnknownCommandEvent
+            final net.kyori.adventure.text.TextComponent.Builder builder = net.kyori.adventure.text.Component.text();
+            if ((parseresults.getContext().getNodes().isEmpty() || !this.vanillaCommandNodes.contains(parseresults.getContext().getNodes().get(0).getNode()))) {
+                if (!org.spigotmc.SpigotConfig.unknownCommandMessage.isEmpty()) {
+                    builder.append(net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer.legacySection().deserialize(org.spigotmc.SpigotConfig.unknownCommandMessage));
+                }
+            } else {
+                // commandlistenerwrapper.sendFailure(ComponentUtils.fromMessage(commandsyntaxexception.getRawMessage()));
+                builder.color(net.kyori.adventure.text.format.NamedTextColor.RED).append(io.papermc.paper.brigadier.PaperBrigadier.componentFromMessage(commandsyntaxexception.getRawMessage()));
+                // Paper end - Add UnknownCommandEvent
             if (commandsyntaxexception.getInput() != null && commandsyntaxexception.getCursor() >= 0) {
                 int i = Math.min(commandsyntaxexception.getInput().length(), commandsyntaxexception.getCursor());
                 MutableComponent ichatmutablecomponent = Component.empty().withStyle(ChatFormatting.GRAY).withStyle((chatmodifier) -> {
@@ -388,7 +399,18 @@ public class Commands {
                 }
 
                 ichatmutablecomponent.append((Component) Component.translatable("command.context.here").withStyle(ChatFormatting.RED, ChatFormatting.ITALIC));
-                commandlistenerwrapper.sendFailure(ichatmutablecomponent);
+                // Paper start - Add UnknownCommandEvent
+                // commandlistenerwrapper.sendFailure(ichatmutablecomponent);
+                builder
+                    .append(net.kyori.adventure.text.Component.newline())
+                    .append(io.papermc.paper.adventure.PaperAdventure.asAdventure(ichatmutablecomponent));
+            }
+            }
+            org.bukkit.event.command.UnknownCommandEvent event = new org.bukkit.event.command.UnknownCommandEvent(commandlistenerwrapper.getBukkitSender(), s, org.spigotmc.SpigotConfig.unknownCommandMessage.isEmpty() ? null : builder.build());
+            org.bukkit.Bukkit.getServer().getPluginManager().callEvent(event);
+            if (event.message() != null) {
+                commandlistenerwrapper.sendFailure(io.papermc.paper.adventure.PaperAdventure.asVanilla(event.message()), false);
+                // Paper end - Add UnknownCommandEvent
             }
 
             return null;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index eb3bb76cf141991acd6a384bf461719de8392754..b6e6b4213e893fac64855cc4b4e6eeb4246050d1 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -529,6 +529,7 @@ public final class CraftServer implements Server {
                     }
                     node = clone;
                 }
+                dispatcher.vanillaCommandNodes.add(node); // Paper
 
                 dispatcher.getDispatcher().getRoot().addChild(node);
             } else {
@@ -911,7 +912,13 @@ public final class CraftServer implements Server {
 
         // Spigot start
         if (!org.spigotmc.SpigotConfig.unknownCommandMessage.isEmpty()) {
-            sender.sendMessage(org.spigotmc.SpigotConfig.unknownCommandMessage);
+            // Paper start
+            org.bukkit.event.command.UnknownCommandEvent event = new org.bukkit.event.command.UnknownCommandEvent(sender, commandLine, net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer.legacySection().deserialize(org.spigotmc.SpigotConfig.unknownCommandMessage));
+            this.getPluginManager().callEvent(event);
+            if (event.message() != null) {
+                sender.sendMessage(event.message());
+            }
+            // Paper end
         }
         // Spigot end