Paper/nms-patches/CommandDispatcher.patch

--- a/net/minecraft/server/CommandDispatcher.java
+++ b/net/minecraft/server/CommandDispatcher.java
@@ -27,12 +27,21 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+// CraftBukkit start
+import com.google.common.base.Joiner;
+import java.util.LinkedHashSet;
+import org.bukkit.craftbukkit.command.VanillaCommandWrapper;
+import org.bukkit.event.player.PlayerCommandSendEvent;
+import org.bukkit.event.server.ServerCommandEvent;
+// CraftBukkit end
+
 public class CommandDispatcher {
 
     private static final Logger a = LogManager.getLogger();
     private final com.mojang.brigadier.CommandDispatcher<CommandListenerWrapper> b = new com.mojang.brigadier.CommandDispatcher();
 
-    public CommandDispatcher(boolean flag) {
+    // CraftBukkit start
+    public final CommandDispatcher init(boolean flag) {
         CommandAdvancement.a(this.b);
         CommandExecute.a(this.b);
         CommandBossBar.a(this.b);
@@ -100,8 +109,13 @@
         }
 
         this.b.findAmbiguities((commandnode, commandnode1, commandnode2, collection) -> {
-            CommandDispatcher.a.warn("Ambiguity between arguments {} and {} with inputs: {}", this.b.getPath(commandnode1), this.b.getPath(commandnode2), collection);
+            // CommandDispatcher.a.warn("Ambiguity between arguments {} and {} with inputs: {}", this.b.getPath(commandnode1), this.b.getPath(commandnode2), collection); // CraftBukkit
         });
+        return this;
+    }
+
+    public CommandDispatcher() {
+        // CraftBukkit end
         this.b.setConsumer((commandcontext, flag, i) -> {
             ((CommandListenerWrapper) commandcontext.getSource()).a(commandcontext, flag, i);
         });
@@ -116,7 +130,47 @@
 
     }
 
+    // CraftBukkit start
+    public int dispatchServerCommand(CommandListenerWrapper sender, String command) {
+        Joiner joiner = Joiner.on(" ");
+        if (command.startsWith("/")) {
+            command = command.substring(1);
+        }
+
+        ServerCommandEvent event = new ServerCommandEvent(sender.getBukkitSender(), command);
+        org.bukkit.Bukkit.getPluginManager().callEvent(event);
+        if (event.isCancelled()) {
+            return 0;
+        }
+        command = event.getCommand();
+
+        String[] args = command.split(" ");
+
+        String cmd = args[0];
+        if (cmd.startsWith("minecraft:")) cmd = cmd.substring("minecraft:".length());
+        if (cmd.startsWith("bukkit:")) cmd = cmd.substring("bukkit:".length());
+
+        // Block disallowed commands
+        if (cmd.equalsIgnoreCase("stop") || cmd.equalsIgnoreCase("kick") || cmd.equalsIgnoreCase("op")
+                || cmd.equalsIgnoreCase("deop") || cmd.equalsIgnoreCase("ban") || cmd.equalsIgnoreCase("ban-ip")
+                || cmd.equalsIgnoreCase("pardon") || cmd.equalsIgnoreCase("pardon-ip") || cmd.equalsIgnoreCase("reload")) {
+            return 0;
+        }
+
+        // Handle vanilla commands;
+        if (sender.getWorld().getServer().getCommandBlockOverride(args[0])) {
+            args[0] = "minecraft:" + args[0];
+        }
+
+        return this.a(sender, joiner.join(args));
+    }
+
     public int a(CommandListenerWrapper commandlistenerwrapper, String s) {
+        return this.a(commandlistenerwrapper, s, s);
+    }
+
+    public int a(CommandListenerWrapper commandlistenerwrapper, String s, String label) {
+        // CraftBukkit end
         StringReader stringreader = new StringReader(s);
 
         if(stringreader.canRead() && stringreader.peek() == 47) {
@@ -128,7 +182,6 @@
         byte b0;
 
         try {
-            byte b1;
             ChatComponentText chatcomponenttext;
 
             try {
@@ -137,52 +190,56 @@
                 return i;
             } catch (CommandException commandexception) {
                 commandlistenerwrapper.sendFailureMessage(commandexception.a());
-                b1 = 0;
-                return b1;
+                b0 = 0;
+                return b0;
             } catch (CommandSyntaxException commandsyntaxexception) {
                 commandlistenerwrapper.sendFailureMessage(ChatComponentUtils.a(commandsyntaxexception.getRawMessage()));
                 if(commandsyntaxexception.getInput() != null && commandsyntaxexception.getCursor() >= 0) {
                     int j = Math.min(commandsyntaxexception.getInput().length(), commandsyntaxexception.getCursor());
-                    IChatBaseComponent ichatbasecomponent = (new ChatComponentText("")).a(EnumChatFormat.GRAY).a((chatmodifier) -> {
-                        chatmodifier.setChatClickable(new ChatClickable(ChatClickable.EnumClickAction.SUGGEST_COMMAND, s));
-                    });
 
+                    chatcomponenttext = new ChatComponentText("");
                     if(j > 10) {
-                        ichatbasecomponent.a("...");
+                        chatcomponenttext.a("...");
                     }
 
-                    ichatbasecomponent.a(commandsyntaxexception.getInput().substring(Math.max(0, j - 10), j));
+                    chatcomponenttext.a(commandsyntaxexception.getInput().substring(Math.max(0, j - 10), j));
                     if(j < commandsyntaxexception.getInput().length()) {
-                        IChatBaseComponent ichatbasecomponent1 = (new ChatComponentText(commandsyntaxexception.getInput().substring(j))).a(new EnumChatFormat[]{EnumChatFormat.RED, EnumChatFormat.UNDERLINE});
+                        ChatComponentText chatcomponenttext1 = new ChatComponentText(commandsyntaxexception.getInput().substring(j));
 
-                        ichatbasecomponent.addSibling(ichatbasecomponent1);
+                        chatcomponenttext1.getChatModifier().setColor(EnumChatFormat.RED);
+                        chatcomponenttext1.getChatModifier().setUnderline(Boolean.valueOf(true));
+                        chatcomponenttext.addSibling(chatcomponenttext1);
                     }
 
-                    ichatbasecomponent.addSibling((new ChatMessage("command.context.here", new Object[0])).a(new EnumChatFormat[]{EnumChatFormat.RED, EnumChatFormat.ITALIC}));
-                    commandlistenerwrapper.sendFailureMessage(ichatbasecomponent);
+                    ChatMessage chatmessage = new ChatMessage("command.context.here", new Object[0]);
+
+                    chatmessage.getChatModifier().setItalic(Boolean.valueOf(true));
+                    chatmessage.getChatModifier().setColor(EnumChatFormat.RED);
+                    chatcomponenttext.addSibling(chatmessage);
+                    chatcomponenttext.getChatModifier().setColor(EnumChatFormat.GRAY);
+                    chatcomponenttext.getChatModifier().setChatClickable(new ChatClickable(ChatClickable.EnumClickAction.SUGGEST_COMMAND, label)); // CraftBukkit
+                    commandlistenerwrapper.sendFailureMessage(chatcomponenttext);
                 }
 
-                b1 = 0;
-                return b1;
+                b0 = 0;
             } catch (Exception exception) {
-                chatcomponenttext = new ChatComponentText;
-            }
-
-            chatcomponenttext.<init>(exception.getMessage() == null?exception.getClass().getName():exception.getMessage());
-            ChatComponentText chatcomponenttext1 = chatcomponenttext;
+                ChatMessage chatmessage1 = new ChatMessage("command.failed", new Object[0]);
 
-            if(CommandDispatcher.a.isDebugEnabled()) {
-                StackTraceElement[] astacktraceelement = exception.getStackTrace();
+                chatcomponenttext = new ChatComponentText(exception.getMessage() == null ? exception.getClass().getName() : exception.getMessage());
+                if (CommandDispatcher.a.isDebugEnabled()) {
+                    StackTraceElement[] astacktraceelement = exception.getStackTrace();
 
-                for(int k = 0; k < Math.min(astacktraceelement.length, 3); ++k) {
-                    chatcomponenttext1.a("\n\n").a(astacktraceelement[k].getMethodName()).a("\n ").a(astacktraceelement[k].getFileName()).a(":").a(String.valueOf(astacktraceelement[k].getLineNumber()));
+                    for (int k = 0; k < Math.min(astacktraceelement.length, 3); ++k) {
+                        chatcomponenttext.a("\n\n" + astacktraceelement[k].getMethodName() + "\n " + astacktraceelement[k].getFileName() + ":" + astacktraceelement[k].getLineNumber());
+                    }
                 }
-            }
 
-            commandlistenerwrapper.sendFailureMessage((new ChatMessage("command.failed", new Object[0])).a((chatmodifier) -> {
-                chatmodifier.setChatHoverable(new ChatHoverable(ChatHoverable.EnumHoverAction.SHOW_TEXT, ichatbasecomponent));
-            }));
-            b0 = 0;
+                chatmessage1.getChatModifier().setChatHoverable(new ChatHoverable(ChatHoverable.EnumHoverAction.SHOW_TEXT, chatcomponenttext));
+                commandlistenerwrapper.sendFailureMessage(chatmessage1);
+                byte b1 = 0;
+
+                return b1;
+            }
         } finally {
             commandlistenerwrapper.getServer().methodProfiler.exit();
         }
@@ -191,11 +248,36 @@
     }
 
     public void a(EntityPlayer entityplayer) {
-        HashMap hashmap = Maps.newHashMap();
-        RootCommandNode rootcommandnode = new RootCommandNode();
+        // CraftBukkit start
+        // Register Vanilla commands into builtRoot as before
+        Map hashmap = Maps.newIdentityHashMap(); // Use identity to prevent aliasing issues
+        RootCommandNode vanillaRoot = new RootCommandNode();
+
+        RootCommandNode<CommandListenerWrapper> vanilla = entityplayer.server.vanillaCommandDispatcher.a().getRoot();
+        hashmap.put(vanilla, vanillaRoot);
+        this.a(vanilla, vanillaRoot, entityplayer.getCommandListener(), (Map) hashmap);
+
+        // Now build the global commands in a second pass
+        RootCommandNode<ICompletionProvider> rootcommandnode = new RootCommandNode();
 
         hashmap.put(this.b.getRoot(), rootcommandnode);
         this.a(this.b.getRoot(), rootcommandnode, entityplayer.getCommandListener(), (Map) hashmap);
+
+        Collection<String> bukkit = new LinkedHashSet<>();
+        for (CommandNode node : rootcommandnode.getChildren()) {
+            bukkit.add(node.getName());
+        }
+
+        PlayerCommandSendEvent event = new PlayerCommandSendEvent(entityplayer.getBukkitEntity(), new LinkedHashSet<>(bukkit));
+        event.getPlayer().getServer().getPluginManager().callEvent(event);
+
+        // Remove labels that were removed during the event
+        for (String orig : bukkit) {
+            if (!event.getCommands().contains(orig)) {
+                rootcommandnode.removeCommand(orig);
+            }
+        }
+        // CraftBukkit end
         entityplayer.playerConnection.sendPacket(new PacketPlayOutCommands(rootcommandnode));
     }