Refactor paper command (#8112)

* Refactor paper command * Improve paper dumpitem output * Register paper command permissions Would be nice to add descriptions for these too, but that's an enhancement for another time * Update MobcapsCommandTest fail message * Notify on bad radius for fix light * fixup rebase
2022-07-08 16:01:42 -07:00 · 2022-07-08 16:01:42 -07:00 · e294802977
commit e294802977
parent 5ffeb70186
11 changed files with 1035 additions and 772 deletions
--- a/patches/server/0009-Paper-command.patch
+++ b/patches/server/0009-Paper-command.patch
@ -4,102 +4,50 @@ Date: Mon, 29 Feb 2016 21:02:09 -0600
 Subject: [PATCH] Paper command


-diff --git a/src/main/java/com/destroystokyo/paper/PaperCommand.java b/src/main/java/com/destroystokyo/paper/PaperCommand.java
+diff --git a/src/main/java/io/papermc/paper/command/CommandUtil.java b/src/main/java/io/papermc/paper/command/CommandUtil.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..b506cd11b76901827cbe66f46db8df400f7015de
+index 0000000000000000000000000000000000000000..953c30500892e5f0c55b8597bc708ea85bf56d6e
 --- /dev/null
-+++ b/src/main/java/com/destroystokyo/paper/PaperCommand.java
-@@ -0,0 +1,287 @@
-+package com.destroystokyo.paper;
+++ b/src/main/java/io/papermc/paper/command/CommandUtil.java
+@@ -0,0 +1,69 @@
+package io.papermc.paper.command;
 +
 +import com.google.common.base.Functions;
-+import com.google.common.base.Joiner;
-+import com.google.common.collect.ImmutableSet;
 +import com.google.common.collect.Iterables;
 +import com.google.common.collect.Lists;
-+import com.google.common.collect.Maps;
-+import net.minecraft.core.Registry;
-+import net.minecraft.resources.ResourceLocation;
-+import net.minecraft.server.MinecraftServer;
-+import net.minecraft.server.level.ServerChunkCache;
-+import net.minecraft.server.level.ServerLevel;
-+import net.minecraft.world.entity.Entity;
-+import net.minecraft.world.entity.EntityType;
-+import net.minecraft.world.level.ChunkPos;
-+import org.apache.commons.lang3.tuple.MutablePair;
-+import org.apache.commons.lang3.tuple.Pair;
-+import org.bukkit.Bukkit;
-+import org.bukkit.Location;
-+import org.bukkit.World;
-+import org.bukkit.command.Command;
-+import org.bukkit.command.CommandSender;
-+import org.bukkit.craftbukkit.CraftServer;
-+import org.bukkit.craftbukkit.CraftWorld;
-+import org.bukkit.entity.Player;
-+
-+import java.io.File;
-+import java.time.LocalDateTime;
-+import java.time.format.DateTimeFormatter;
 +import java.util.ArrayList;
 +import java.util.Arrays;
 +import java.util.Collection;
-+import java.util.Collections;
 +import java.util.Iterator;
 +import java.util.List;
-+import java.util.Locale;
-+import java.util.Map;
-+import java.util.Set;
-+import java.util.stream.Collectors;
+import net.minecraft.resources.ResourceLocation;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
 +
-+import static net.kyori.adventure.text.Component.text;
-+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
-+import static net.kyori.adventure.text.format.NamedTextColor.RED;
-+import static net.kyori.adventure.text.format.NamedTextColor.YELLOW;
-+
-+public class PaperCommand extends Command {
-+    private static final String BASE_PERM = "bukkit.command.paper.";
-+    private static final ImmutableSet<String> SUBCOMMANDS = ImmutableSet.<String>builder().add("heap", "entity", "reload", "version").build();
-+
-+    public PaperCommand(String name) {
-+        super(name);
-+        this.description = "Paper related commands";
-+        this.usageMessage = "/paper [" + Joiner.on(" | ").join(SUBCOMMANDS) + "]";
-+        this.setPermission("bukkit.command.paper;" + Joiner.on(';').join(SUBCOMMANDS.stream().map(s -> BASE_PERM + s).collect(Collectors.toSet())));
-+    }
-+
-+    private static boolean testPermission(CommandSender commandSender, String permission) {
-+        if (commandSender.hasPermission(BASE_PERM + permission) || commandSender.hasPermission("bukkit.command.paper")) return true;
-+        commandSender.sendMessage(text("I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is in error.", RED));
-+        return false;
-+    }
-+
-+    @Override
-+    public List<String> tabComplete(CommandSender sender, String alias, String[] args, Location location) throws IllegalArgumentException {
-+        if (args.length <= 1)
-+            return getListMatchingLast(sender, args, SUBCOMMANDS);
-+
-+        switch (args[0].toLowerCase(Locale.ENGLISH))
-+        {
-+            case "entity":
-+                if (args.length == 2)
-+                    return getListMatchingLast(sender, args, "help", "list");
-+                if (args.length == 3)
-+                    return getListMatchingLast(sender, args, Registry.ENTITY_TYPE.keySet().stream().map(ResourceLocation::toString).sorted().toArray(String[]::new));
-+                break;
-+        }
-+        return Collections.emptyList();
+@DefaultQualifier(NonNull.class)
+public final class CommandUtil {
+    private CommandUtil() {
 +    }
 +
 +    // Code from Mojang - copyright them
-+    public static List<String> getListMatchingLast(CommandSender sender, String[] args, String... matches) {
-+        return getListMatchingLast(sender, args, (Collection) Arrays.asList(matches));
+    public static List<String> getListMatchingLast(
+        final CommandSender sender,
+        final String[] args,
+        final String... matches
+    ) {
+        return getListMatchingLast(sender, args, Arrays.asList(matches));
 +    }
 +
-+    public static boolean matches(String s, String s1) {
+    public static boolean matches(final String s, final String s1) {
 +        return s1.regionMatches(true, 0, s, 0, s.length());
 +    }
 +
-+    public static List<String> getListMatchingLast(CommandSender sender, String[] strings, Collection<?> collection) {
+    public static List<String> getListMatchingLast(
+        final CommandSender sender,
+        final String[] strings,
+        final Collection<?> collection
+    ) {
 +        String last = strings[strings.length - 1];
 +        ArrayList<String> results = Lists.newArrayList();
 +
@ -109,7 +57,7 @@ index 0000000000000000000000000000000000000000..b506cd11b76901827cbe66f46db8df40
 +            while (iterator.hasNext()) {
 +                String s1 = (String) iterator.next();
 +
-+                if (matches(last, s1) && (sender.hasPermission(BASE_PERM + s1) || sender.hasPermission("bukkit.command.paper"))) {
+                if (matches(last, s1) && (sender.hasPermission(PaperCommand.BASE_PERM + s1) || sender.hasPermission("bukkit.command.paper"))) {
 +                    results.add(s1);
 +                }
 +            }
@ -130,188 +78,175 @@ index 0000000000000000000000000000000000000000..b506cd11b76901827cbe66f46db8df40
 +        return results;
 +    }
 +    // end copy stuff
+}
+diff --git a/src/main/java/io/papermc/paper/command/PaperCommand.java b/src/main/java/io/papermc/paper/command/PaperCommand.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..b3a58bf4b654e336826dc04da9e2f80ff8b9a9a7
+--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/PaperCommand.java
+@@ -0,0 +1,145 @@
+package io.papermc.paper.command;
+
+import io.papermc.paper.command.subcommands.EntityCommand;
+import io.papermc.paper.command.subcommands.HeapDumpCommand;
+import io.papermc.paper.command.subcommands.ReloadCommand;
+import io.papermc.paper.command.subcommands.VersionCommand;
+import it.unimi.dsi.fastutil.Pair;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import net.minecraft.Util;
+import org.bukkit.Bukkit;
+import org.bukkit.Location;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.permissions.Permission;
+import org.bukkit.permissions.PermissionDefault;
+import org.bukkit.plugin.PluginManager;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class PaperCommand extends Command {
+    static final String BASE_PERM = "bukkit.command.paper.";
+    // subcommand label -> subcommand
+    private static final Map<String, PaperSubcommand> SUBCOMMANDS = Util.make(() -> {
+        final Map<Set<String>, PaperSubcommand> commands = new HashMap<>();
+
+        commands.put(Set.of("heap"), new HeapDumpCommand());
+        commands.put(Set.of("entity"), new EntityCommand());
+        commands.put(Set.of("reload"), new ReloadCommand());
+        commands.put(Set.of("version"), new VersionCommand());
+
+        return commands.entrySet().stream()
+            .flatMap(entry -> entry.getKey().stream().map(s -> Map.entry(s, entry.getValue())))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    });
+    // alias -> subcommand label
+    private static final Map<String, String> ALIASES = Util.make(() -> {
+        final Map<String, Set<String>> aliases = new HashMap<>();
+
+        aliases.put("version", Set.of("ver"));
+
+        return aliases.entrySet().stream()
+            .flatMap(entry -> entry.getValue().stream().map(s -> Map.entry(s, entry.getKey())))
+            .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    });
+
+    public PaperCommand(final String name) {
+        super(name);
+        this.description = "Paper related commands";
+        this.usageMessage = "/paper [" + String.join(" | ", SUBCOMMANDS.keySet()) + "]";
+        final List<String> permissions = new ArrayList<>();
+        permissions.add("bukkit.command.paper");
+        permissions.addAll(SUBCOMMANDS.keySet().stream().map(s -> BASE_PERM + s).toList());
+        this.setPermission(String.join(";", permissions));
+        final PluginManager pluginManager = Bukkit.getServer().getPluginManager();
+        for (final String perm : permissions) {
+            pluginManager.addPermission(new Permission(perm, PermissionDefault.OP));
+        }
+    }
+
+    private static boolean testPermission(final CommandSender sender, final String permission) {
+        if (sender.hasPermission(BASE_PERM + permission) || sender.hasPermission("bukkit.command.paper")) {
+            return true;
+        }
+        sender.sendMessage(text("I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is in error.", RED));
+        return false;
+    }
 +
 +    @Override
-+    public boolean execute(CommandSender sender, String commandLabel, String[] args) {
-+        if (!testPermission(sender)) return true;
+    public List<String> tabComplete(
+        final CommandSender sender,
+        final String alias,
+        final String[] args,
+        final @Nullable Location location
+    ) throws IllegalArgumentException {
+        if (args.length <= 1) {
+            return CommandUtil.getListMatchingLast(sender, args, SUBCOMMANDS.keySet());
+        }
+
+        final @Nullable Pair<String, PaperSubcommand> subCommand = resolveCommand(args[0]);
+        if (subCommand != null) {
+            return subCommand.second().tabComplete(sender, subCommand.first(), Arrays.copyOfRange(args, 1, args.length));
+        }
+
+        return Collections.emptyList();
+    }
+
+    @Override
+    public boolean execute(
+        final CommandSender sender,
+        final String commandLabel,
+        final String[] args
+    ) {
+        if (!testPermission(sender)) {
+            return true;
+        }
 +
 +        if (args.length == 0) {
 +            sender.sendMessage(text("Usage: " + this.usageMessage, RED));
 +            return false;
 +        }
-+        if (SUBCOMMANDS.contains(args[0].toLowerCase(Locale.ENGLISH))) {
-+            if (!testPermission(sender, args[0].toLowerCase(Locale.ENGLISH))) return true;
-+        }
-+        switch (args[0].toLowerCase(Locale.ENGLISH))  {
-+            case "heap":
-+                dumpHeap(sender);
-+                break;
-+            case "entity":
-+                listEntities(sender, args);
-+                break;
-+            case "reload":
-+                doReload(sender);
-+                break;
-+            case "ver":
-+                if (!testPermission(sender, "version")) break; // "ver" needs a special check because it's an alias. All other commands are checked up before the switch statement (because they are present in the SUBCOMMANDS set)
-+            case "version":
-+                Command ver = MinecraftServer.getServer().server.getCommandMap().getCommand("version");
-+                if (ver != null) {
-+                    ver.execute(sender, commandLabel, new String[0]);
-+                    break;
-+                }
-+                // else - fall through to default
-+            default:
-+                sender.sendMessage(text("Usage: " + this.usageMessage, RED));
-+                return false;
+        final @Nullable Pair<String, PaperSubcommand> subCommand = resolveCommand(args[0]);
+
+        if (subCommand == null) {
+            sender.sendMessage(text("Usage: " + this.usageMessage, RED));
+            return false;
 +        }
 +
-+        return true;
+        if (!testPermission(sender, subCommand.first())) {
+            return true;
+        }
+        final String[] choppedArgs = Arrays.copyOfRange(args, 1, args.length);
+        return subCommand.second().execute(sender, subCommand.first(), choppedArgs);
 +    }
 +
-+    /*
-+     * Ported from MinecraftForge - author: LexManos <LexManos@gmail.com> - License: LGPLv2.1
-+     */
-+    private void listEntities(CommandSender sender, String[] args) {
-+        if (args.length < 2 || args[1].toLowerCase(Locale.ENGLISH).equals("help")) {
-+            sender.sendMessage(text("Use /paper entity [list] help for more information on a specific command", RED));
-+            return;
+    private static @Nullable Pair<String, PaperSubcommand> resolveCommand(String label) {
+        label = label.toLowerCase(Locale.ENGLISH);
+        @Nullable PaperSubcommand subCommand = SUBCOMMANDS.get(label);
+        if (subCommand == null) {
+            final @Nullable String command = ALIASES.get(label);
+            if (command != null) {
+                label = command;
+                subCommand = SUBCOMMANDS.get(command);
+            }
 +        }
 +
-+        switch (args[1].toLowerCase(Locale.ENGLISH)) {
-+            case "list":
-+                String filter = "*";
-+                if (args.length > 2) {
-+                    if (args[2].toLowerCase(Locale.ENGLISH).equals("help")) {
-+                        sender.sendMessage(text("Use /paper entity list [filter] [worldName] to get entity info that matches the optional filter.", RED));
-+                        return;
-+                    }
-+                    filter = args[2];
-+                }
-+                final String cleanfilter = filter.replace("?", ".?").replace("*", ".*?");
-+                Set<ResourceLocation> names = Registry.ENTITY_TYPE.keySet().stream()
-+                        .filter(n -> n.toString().matches(cleanfilter))
-+                        .collect(Collectors.toSet());
-+
-+                if (names.isEmpty()) {
-+                    sender.sendMessage(text("Invalid filter, does not match any entities. Use /paper entity list for a proper list", RED));
-+                    sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
-+                    return;
-+                }
-+
-+                String worldName;
-+                if (args.length > 3) {
-+                    worldName = args[3];
-+                } else if (sender instanceof Player) {
-+                    worldName = ((Player) sender).getWorld().getName();
-+                } else {
-+                    sender.sendMessage(text("Please specify the name of a world", RED));
-+                    sender.sendMessage(text("To do so without a filter, specify '*' as the filter", RED));
-+                    sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
-+                    return;
-+                }
-+
-+                Map<ResourceLocation, MutablePair<Integer, Map<ChunkPos, Integer>>> list = Maps.newHashMap();
-+                World bukkitWorld = Bukkit.getWorld(worldName);
-+                if (bukkitWorld == null) {
-+                    sender.sendMessage(text("Could not load world for " + worldName + ". Please select a valid world.", RED));
-+                    sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
-+                    return;
-+                }
-+                ServerLevel world = ((CraftWorld) Bukkit.getWorld(worldName)).getHandle();
-+
-+                Map<ResourceLocation, Integer> nonEntityTicking = Maps.newHashMap();
-+                ServerChunkCache chunkProviderServer = world.getChunkSource();
-+
-+                world.getAllEntities().forEach(e -> {
-+                    ResourceLocation key = EntityType.getKey(e.getType());
-+
-+                    MutablePair<Integer, Map<ChunkPos, Integer>> info = list.computeIfAbsent(key, k -> MutablePair.of(0, Maps.newHashMap()));
-+                    ChunkPos chunk = e.chunkPosition();
-+                    info.left++;
-+                    info.right.put(chunk, info.right.getOrDefault(chunk, 0) + 1);
-+                    if (!chunkProviderServer.isPositionTicking(e)) {
-+                        nonEntityTicking.merge(key, Integer.valueOf(1), Integer::sum);
-+                    }
-+                });
-+
-+                if (names.size() == 1) {
-+                    ResourceLocation name = names.iterator().next();
-+                    Pair<Integer, Map<ChunkPos, Integer>> info = list.get(name);
-+                    int nonTicking = nonEntityTicking.getOrDefault(name, Integer.valueOf(0)).intValue();
-+                    if (info == null) {
-+                        sender.sendMessage(text("No entities found.", RED));
-+                        return;
-+                    }
-+                    sender.sendMessage("Entity: " + name + " Total Ticking: " + (info.getLeft() - nonTicking) + ", Total Non-Ticking: " + nonTicking);
-+                    info.getRight().entrySet().stream()
-+                            .sorted((a, b) -> !a.getValue().equals(b.getValue()) ? b.getValue() - a.getValue() : a.getKey().toString().compareTo(b.getKey().toString()))
-+                            .limit(10).forEach(e -> sender.sendMessage("  " + e.getValue() + ": " + e.getKey().x + ", " + e.getKey().z + (chunkProviderServer.isPositionTicking(e.getKey().toLong()) ? " (Ticking)" : " (Non-Ticking)")));
-+                } else {
-+                    List<Pair<ResourceLocation, Integer>> info = list.entrySet().stream()
-+                            .filter(e -> names.contains(e.getKey()))
-+                            .map(e -> Pair.of(e.getKey(), e.getValue().left))
-+                            .sorted((a, b) -> !a.getRight().equals(b.getRight()) ? b.getRight() - a.getRight() : a.getKey().toString().compareTo(b.getKey().toString()))
-+                            .collect(Collectors.toList());
-+
-+                    if (info == null || info.size() == 0) {
-+                        sender.sendMessage(text("No entities found.", RED));
-+                        return;
-+                    }
-+
-+                    int count = info.stream().mapToInt(Pair::getRight).sum();
-+                    int nonTickingCount = nonEntityTicking.values().stream().mapToInt(Integer::intValue).sum();
-+                    sender.sendMessage("Total Ticking: " + (count - nonTickingCount) + ", Total Non-Ticking: " + nonTickingCount);
-+                    info.forEach(e -> {
-+                        int nonTicking = nonEntityTicking.getOrDefault(e.getKey(), Integer.valueOf(0)).intValue();
-+                        sender.sendMessage("  " + (e.getValue() - nonTicking) + " (" + nonTicking + ") " + ": " + e.getKey());
-+                    });
-+                    sender.sendMessage("* First number is ticking entities, second number is non-ticking entities");
-+                }
-+                break;
+        if (subCommand != null) {
+            return Pair.of(label, subCommand);
 +        }
-+    }
 +
-+    private void dumpHeap(CommandSender sender) {
-+        java.nio.file.Path dir = java.nio.file.Paths.get("./dumps");
-+        String name = "heap-dump-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now());
-+
-+        Command.broadcastCommandMessage(sender, text("Writing JVM heap data...", YELLOW));
-+
-+        java.nio.file.Path file = CraftServer.dumpHeap(dir, name);
-+        if (file != null) {
-+            Command.broadcastCommandMessage(sender, text("Heap dump saved to " + file, GREEN));
-+        } else {
-+            Command.broadcastCommandMessage(sender, text("Failed to write heap dump, see server log for details", RED));
-+        }
-+    }
-+
-+    private void doReload(CommandSender sender) {
-+        Command.broadcastCommandMessage(sender, text("Please note that this command is not supported and may cause issues.", RED));
-+        Command.broadcastCommandMessage(sender, text("If you encounter any issues please use the /stop command to restart your server.", RED));
-+
-+        MinecraftServer server = ((CraftServer) sender.getServer()).getServer();
-+        server.paperConfigurations.reloadConfigs(server);
-+        server.server.reloadCount++;
-+
-+        Command.broadcastCommandMessage(sender, text("Paper config reload complete.", GREEN));
+        return null;
 +    }
 +}
 diff --git a/src/main/java/io/papermc/paper/command/PaperCommands.java b/src/main/java/io/papermc/paper/command/PaperCommands.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..82bce89dc174c8c4a4ab8efeffaaf22ddeb377fb
+index 0000000000000000000000000000000000000000..6a00f3d38da8107825ab1d405f337fd077b09f72
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/command/PaperCommands.java
-@@ -0,0 +1,25 @@
+@@ -0,0 +1,27 @@
 +package io.papermc.paper.command;
 +
-+import com.destroystokyo.paper.PaperCommand;
 +import net.minecraft.server.MinecraftServer;
 +import org.bukkit.command.Command;
 +
 +import java.util.HashMap;
 +import java.util.Map;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
 +
+@DefaultQualifier(NonNull.class)
 +public final class PaperCommands {
 +
 +    private PaperCommands() {
@ -328,6 +263,289 @@ index 0000000000000000000000000000000000000000..82bce89dc174c8c4a4ab8efeffaaf22d
 +        });
 +    }
 +}
+diff --git a/src/main/java/io/papermc/paper/command/PaperSubcommand.java b/src/main/java/io/papermc/paper/command/PaperSubcommand.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..6ff5d42a866d2752c73a766815aa190b2b0dc36f
+--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/PaperSubcommand.java
+@@ -0,0 +1,16 @@
+package io.papermc.paper.command;
+
+import java.util.Collections;
+import java.util.List;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public interface PaperSubcommand {
+    boolean execute(CommandSender sender, String subCommand, String[] args);
+
+    default List<String> tabComplete(final CommandSender sender, final String subCommand, final String[] args) {
+        return Collections.emptyList();
+    }
+}
+diff --git a/src/main/java/io/papermc/paper/command/subcommands/EntityCommand.java b/src/main/java/io/papermc/paper/command/subcommands/EntityCommand.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..68f99e93ed3e843b4001a7a27620f88a48b85e67
+--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/subcommands/EntityCommand.java
+@@ -0,0 +1,145 @@
+package io.papermc.paper.command.subcommands;
+
+import com.google.common.collect.Maps;
+import io.papermc.paper.command.CommandUtil;
+import io.papermc.paper.command.PaperSubcommand;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Set;
+import java.util.stream.Collectors;
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerChunkCache;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.world.entity.EntityType;
+import net.minecraft.world.level.ChunkPos;
+import org.apache.commons.lang3.tuple.MutablePair;
+import org.apache.commons.lang3.tuple.Pair;
+import org.bukkit.Bukkit;
+import org.bukkit.World;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftWorld;
+import org.bukkit.entity.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class EntityCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        this.listEntities(sender, args);
+        return true;
+    }
+
+    @Override
+    public List<String> tabComplete(final CommandSender sender, final String subCommand, final String[] args) {
+        if (args.length == 1) {
+            return CommandUtil.getListMatchingLast(sender, args, "help", "list");
+        } else if (args.length == 2) {
+            return CommandUtil.getListMatchingLast(sender, args, Registry.ENTITY_TYPE.keySet().stream().map(ResourceLocation::toString).sorted().toArray(String[]::new));
+        }
+        return Collections.emptyList();
+    }
+
+    /*
+     * Ported from MinecraftForge - author: LexManos <LexManos@gmail.com> - License: LGPLv2.1
+     */
+    private void listEntities(final CommandSender sender, final String[] args) {
+        // help
+        if (args.length < 1 || !args[0].toLowerCase(Locale.ENGLISH).equals("list")) {
+            sender.sendMessage(text("Use /paper entity [list] help for more information on a specific command", RED));
+            return;
+        }
+
+        if ("list".equals(args[0].toLowerCase(Locale.ENGLISH))) {
+            String filter = "*";
+            if (args.length > 1) {
+                if (args[1].toLowerCase(Locale.ENGLISH).equals("help")) {
+                    sender.sendMessage(text("Use /paper entity list [filter] [worldName] to get entity info that matches the optional filter.", RED));
+                    return;
+                }
+                filter = args[1];
+            }
+            final String cleanfilter = filter.replace("?", ".?").replace("*", ".*?");
+            Set<ResourceLocation> names = Registry.ENTITY_TYPE.keySet().stream()
+                .filter(n -> n.toString().matches(cleanfilter))
+                .collect(Collectors.toSet());
+            if (names.isEmpty()) {
+                sender.sendMessage(text("Invalid filter, does not match any entities. Use /paper entity list for a proper list", RED));
+                sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                return;
+            }
+            String worldName;
+            if (args.length > 2) {
+                worldName = args[2];
+            } else if (sender instanceof Player) {
+                worldName = ((Player) sender).getWorld().getName();
+            } else {
+                sender.sendMessage(text("Please specify the name of a world", RED));
+                sender.sendMessage(text("To do so without a filter, specify '*' as the filter", RED));
+                sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                return;
+            }
+            Map<ResourceLocation, MutablePair<Integer, Map<ChunkPos, Integer>>> list = Maps.newHashMap();
+            @Nullable World bukkitWorld = Bukkit.getWorld(worldName);
+            if (bukkitWorld == null) {
+                sender.sendMessage(text("Could not load world for " + worldName + ". Please select a valid world.", RED));
+                sender.sendMessage(text("Usage: /paper entity list [filter] [worldName]", RED));
+                return;
+            }
+            ServerLevel world = ((CraftWorld) bukkitWorld).getHandle();
+            Map<ResourceLocation, Integer> nonEntityTicking = Maps.newHashMap();
+            ServerChunkCache chunkProviderServer = world.getChunkSource();
+            world.getAllEntities().forEach(e -> {
+                ResourceLocation key = EntityType.getKey(e.getType());
+
+                MutablePair<Integer, Map<ChunkPos, Integer>> info = list.computeIfAbsent(key, k -> MutablePair.of(0, Maps.newHashMap()));
+                ChunkPos chunk = e.chunkPosition();
+                info.left++;
+                info.right.put(chunk, info.right.getOrDefault(chunk, 0) + 1);
+                if (!chunkProviderServer.isPositionTicking(e)) {
+                    nonEntityTicking.merge(key, 1, Integer::sum);
+                }
+            });
+            if (names.size() == 1) {
+                ResourceLocation name = names.iterator().next();
+                Pair<Integer, Map<ChunkPos, Integer>> info = list.get(name);
+                int nonTicking = nonEntityTicking.getOrDefault(name, 0);
+                if (info == null) {
+                    sender.sendMessage(text("No entities found.", RED));
+                    return;
+                }
+                sender.sendMessage("Entity: " + name + " Total Ticking: " + (info.getLeft() - nonTicking) + ", Total Non-Ticking: " + nonTicking);
+                info.getRight().entrySet().stream()
+                    .sorted((a, b) -> !a.getValue().equals(b.getValue()) ? b.getValue() - a.getValue() : a.getKey().toString().compareTo(b.getKey().toString()))
+                    .limit(10).forEach(e -> sender.sendMessage("  " + e.getValue() + ": " + e.getKey().x + ", " + e.getKey().z + (chunkProviderServer.isPositionTicking(e.getKey().toLong()) ? " (Ticking)" : " (Non-Ticking)")));
+            } else {
+                List<Pair<ResourceLocation, Integer>> info = list.entrySet().stream()
+                    .filter(e -> names.contains(e.getKey()))
+                    .map(e -> Pair.of(e.getKey(), e.getValue().left))
+                    .sorted((a, b) -> !a.getRight().equals(b.getRight()) ? b.getRight() - a.getRight() : a.getKey().toString().compareTo(b.getKey().toString()))
+                    .toList();
+
+                if (info.isEmpty()) {
+                    sender.sendMessage(text("No entities found.", RED));
+                    return;
+                }
+
+                int count = info.stream().mapToInt(Pair::getRight).sum();
+                int nonTickingCount = nonEntityTicking.values().stream().mapToInt(Integer::intValue).sum();
+                sender.sendMessage("Total Ticking: " + (count - nonTickingCount) + ", Total Non-Ticking: " + nonTickingCount);
+                info.forEach(e -> {
+                    int nonTicking = nonEntityTicking.getOrDefault(e.getKey(), 0);
+                    sender.sendMessage("  " + (e.getValue() - nonTicking) + " (" + nonTicking + ") " + ": " + e.getKey());
+                });
+                sender.sendMessage("* First number is ticking entities, second number is non-ticking entities");
+            }
+        }
+    }
+}
+diff --git a/src/main/java/io/papermc/paper/command/subcommands/HeapDumpCommand.java b/src/main/java/io/papermc/paper/command/subcommands/HeapDumpCommand.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..cd2e4d792e972b8bf1e07b8961594a670ae949cf
+--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/subcommands/HeapDumpCommand.java
+@@ -0,0 +1,38 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftServer;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+import static net.kyori.adventure.text.format.NamedTextColor.YELLOW;
+
+@DefaultQualifier(NonNull.class)
+public final class HeapDumpCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        this.dumpHeap(sender);
+        return true;
+    }
+
+    private void dumpHeap(final CommandSender sender) {
+        java.nio.file.Path dir = java.nio.file.Paths.get("./dumps");
+        String name = "heap-dump-" + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now());
+
+        Command.broadcastCommandMessage(sender, text("Writing JVM heap data...", YELLOW));
+
+        java.nio.file.Path file = CraftServer.dumpHeap(dir, name);
+        if (file != null) {
+            Command.broadcastCommandMessage(sender, text("Heap dump saved to " + file, GREEN));
+        } else {
+            Command.broadcastCommandMessage(sender, text("Failed to write heap dump, see server log for details", RED));
+        }
+    }
+}
+diff --git a/src/main/java/io/papermc/paper/command/subcommands/ReloadCommand.java b/src/main/java/io/papermc/paper/command/subcommands/ReloadCommand.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..bd68139ae635f2ad7ec8e7a21e0056a139c4c62e
+--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/subcommands/ReloadCommand.java
+@@ -0,0 +1,33 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.CraftServer;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class ReloadCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        this.doReload(sender);
+        return true;
+    }
+
+    private void doReload(final CommandSender sender) {
+        Command.broadcastCommandMessage(sender, text("Please note that this command is not supported and may cause issues.", RED));
+        Command.broadcastCommandMessage(sender, text("If you encounter any issues please use the /stop command to restart your server.", RED));
+
+        MinecraftServer server = ((CraftServer) sender.getServer()).getServer();
+        server.paperConfigurations.reloadConfigs(server);
+        server.server.reloadCount++;
+
+        Command.broadcastCommandMessage(sender, text("Paper config reload complete.", GREEN));
+    }
+}
+diff --git a/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java b/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..ae60bd96b5284d54676d8e7e4dd5d170b526ec1e
+--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/subcommands/VersionCommand.java
+@@ -0,0 +1,21 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+@DefaultQualifier(NonNull.class)
+public final class VersionCommand implements PaperSubcommand {
+    @Override
+    public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+        final @Nullable Command ver = MinecraftServer.getServer().server.getCommandMap().getCommand("version");
+        if (ver != null) {
+            ver.execute(sender, "paper", new String[0]);
+        }
+        return true;
+    }
+}
 diff --git a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java b/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java
 index e476f93547f386ded0174693a6218d793ccc450b..393e465b0bac55d407f2ec66d7b11ed0537c9641 100644
 --- a/src/main/java/net/minecraft/server/dedicated/DedicatedServer.java