init

build.gradle.kts

@@ -0,0 +1,72 @@
+plugins {
+    id("java")
+    id("java-library")
+    id("maven-publish")
+}
+
+group = "ru.d3st0ny"
+version = "0.1"
+
+repositories {
+    mavenCentral()
+    maven { url = uri("https://libraries.minecraft.net") }
+    maven { url = uri("https://papermc.io/repo/repository/maven-public/") }
+}
+
+dependencies {
+    api("com.mojang:brigadier:1.0.18") {
+        exclude("com.google.guava", "guava")
+    }
+    compileOnly("io.papermc.paper:paper-api:1.19-R0.1-SNAPSHOT")
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("maven"){
+            artifactId = project.name.toLowerCase()
+            groupId = "${project.group}"
+            version = "${project.version}"
+            from(components["java"])
+        }
+    }
+    repositories {
+        maven {
+            url = uri("https://gitea.destony.dev/api/packages/Polygon/maven")
+            name = "gitea"
+            credentials {
+                username = System.getenv("gitUsername")
+                password = System.getenv("gitPassword")
+            }
+        }
+    }
+}
+
+val javaVersion = 17
+
+tasks {
+
+    // USE THIS TASK FOR BUILD & PUBLISH TO MAVEN REPO
+    publish {
+        dependsOn(assemble)
+    }
+
+    // USE THIS TASK FOR BUILD
+    assemble {}
+
+    compileJava {
+        options.encoding = Charsets.UTF_8.name()
+        options.release.set(javaVersion)
+    }
+
+    javadoc {
+        options.encoding = Charsets.UTF_8.name()
+    }
+
+    processResources {
+        filteringCharset = Charsets.UTF_8.name()
+    }
+}
+
+java {
+    toolchain.languageVersion.set(JavaLanguageVersion.of(javaVersion))
+}

gradle.properties

@@ -0,0 +1 @@
+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.4.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

gradlew.bat

@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

settings.gradle.kts

@@ -0,0 +1 @@
+rootProject.name = "adajency"

src/main/java/ru/d3st0ny/adajency/Adajency.java

@@ -0,0 +1,115 @@
+package ru.d3st0ny.adajency;
+
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import com.mojang.brigadier.suggestion.SuggestionProvider;
+import com.mojang.brigadier.tree.LiteralCommandNode;
+
+import org.bukkit.command.Command;
+import org.bukkit.entity.Player;
+
+import java.util.Objects;
+import java.util.function.Predicate;
+
+/**
+ * Utility for using Minecraft's 1.13 'brigadier' library in Bukkit plugins.
+ */
+public interface Adajency {
+
+    /**
+     * Registers the provided argument data to the dispatcher, against all
+     * aliases defined for the {@code command}.
+     *
+     * <p>Additionally applies the CraftBukkit {@link SuggestionProvider}
+     * to all arguments within the node, so ASK_SERVER suggestions can continue
+     * to function for the command.</p>
+     *
+     * <p>Players will only be sent argument data if they pass the provided
+     * {@code permissionTest}.</p>
+     *
+     * @param command the command to read aliases from
+     * @param node the argument data
+     * @param permissionTest the predicate to check whether players should be sent argument data
+     */
+    void register(Command command, LiteralCommandNode<?> node, Predicate<? super Player> permissionTest);
+
+    /**
+     * Registers the provided argument data to the dispatcher, against all
+     * aliases defined for the {@code command}.
+     *
+     * <p>Additionally applies the CraftBukkit {@link SuggestionProvider}
+     * to all arguments within the node, so ASK_SERVER suggestions can continue
+     * to function for the command.</p>
+     *
+     * <p>Players will only be sent argument data if they pass the provided
+     * {@code permissionTest}.</p>
+     *
+     * @param command the command to read aliases from
+     * @param argumentBuilder the argument data, in a builder form
+     * @param permissionTest the predicate to check whether players should be sent argument data
+     */
+    default void register(Command command, LiteralArgumentBuilder<?> argumentBuilder, Predicate<? super Player> permissionTest) {
+        Objects.requireNonNull(command, "command");
+        Objects.requireNonNull(argumentBuilder, "argumentBuilder");
+        Objects.requireNonNull(permissionTest, "permissionTest");
+        register(command, argumentBuilder.build(), permissionTest);
+    }
+
+    /**
+     * Registers the provided argument data to the dispatcher, against all
+     * aliases defined for the {@code command}.
+     *
+     * <p>Additionally applies the CraftBukkit {@link SuggestionProvider}
+     * to all arguments within the node, so ASK_SERVER suggestions can continue
+     * to function for the command.</p>
+     *
+     * @param command the command to read aliases from
+     * @param node the argument data
+     */
+    void register(Command command, LiteralCommandNode<?> node);
+
+    /**
+     * Registers the provided argument data to the dispatcher, against all
+     * aliases defined for the {@code command}.
+     *
+     * <p>Additionally applies the CraftBukkit {@link SuggestionProvider}
+     * to all arguments within the node, so ASK_SERVER suggestions can continue
+     * to function for the command.</p>
+     *
+     * @param command the command to read aliases from
+     * @param argumentBuilder the argument data, in a builder form
+     */
+    default void register(Command command, LiteralArgumentBuilder<?> argumentBuilder) {
+        Objects.requireNonNull(command, "command");
+        Objects.requireNonNull(argumentBuilder, "argumentBuilder");
+        register(command, argumentBuilder.build());
+    }
+
+    /**
+     * Registers the provided argument data to the dispatcher.
+     *
+     * <p>Equivalent to calling
+     * {@link CommandDispatcher#register(LiteralArgumentBuilder)}.</p>
+     *
+     * <p>Prefer using {@link #register(Command, LiteralCommandNode)}.</p>
+     *
+     * @param node the argument data
+     */
+    void register(LiteralCommandNode<?> node);
+
+    /**
+     * Registers the provided argument data to the dispatcher.
+     *
+     * <p>Equivalent to calling
+     * {@link CommandDispatcher#register(LiteralArgumentBuilder)}.</p>
+     *
+     * <p>Prefer using {@link #register(Command, LiteralArgumentBuilder)}.</p>
+     *
+     * @param argumentBuilder the argument data
+     */
+    default void register(LiteralArgumentBuilder<?> argumentBuilder) {
+        Objects.requireNonNull(argumentBuilder, "argumentBuilder");
+        register(argumentBuilder.build());
+    }
+
+}

src/main/java/ru/d3st0ny/adajency/AdajencyImpl.java

@@ -0,0 +1,311 @@
+package ru.d3st0ny.adajency;
+
+import com.mojang.brigadier.CommandDispatcher;
+import com.mojang.brigadier.builder.LiteralArgumentBuilder;
+import com.mojang.brigadier.suggestion.SuggestionProvider;
+import com.mojang.brigadier.tree.ArgumentCommandNode;
+import com.mojang.brigadier.tree.CommandNode;
+import com.mojang.brigadier.tree.LiteralCommandNode;
+import com.mojang.brigadier.tree.RootCommandNode;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.Command;
+import org.bukkit.command.PluginCommand;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.Listener;
+import org.bukkit.event.player.PlayerCommandSendEvent;
+import org.bukkit.event.server.ServerLoadEvent;
+import org.bukkit.plugin.Plugin;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+final class AdajencyImpl implements Adajency {
+
+    // obc.CraftServer#console field
+    private static final Field CONSOLE_FIELD;
+
+    // nms.MinecraftServer#getCommandDispatcher method
+    private static final Method GET_COMMAND_DISPATCHER_METHOD;
+
+    // nms.CommandDispatcher#getDispatcher (obfuscated) method
+    private static final Method GET_BRIGADIER_DISPATCHER_METHOD;
+
+    // obc.command.BukkitCommandWrapper constructor
+    private static final Constructor<?> COMMAND_WRAPPER_CONSTRUCTOR;
+
+    // ArgumentCommandNode#customSuggestions field
+    private static final Field CUSTOM_SUGGESTIONS_FIELD;
+
+    // CommandNode#command
+    private static final Field COMMAND_EXECUTE_FUNCTION_FIELD;
+
+    // CommandNode#children, CommandNode#literals, CommandNode#arguments fields
+    private static final Field CHILDREN_FIELD;
+    private static final Field LITERALS_FIELD;
+    private static final Field ARGUMENTS_FIELD;
+
+    // An array of the CommandNode fields above: [#children, #literals, #arguments]
+    private static final Field[] CHILDREN_FIELDS;
+
+    // Dummy instance of Command used to ensure the executable bit gets set on
+    // mock commands when they're encoded into data sent to the client
+    private static final com.mojang.brigadier.Command<?> DUMMY_COMMAND;
+
+    static {
+        try {
+            final Class<?> minecraftServer;
+            final Class<?> commandDispatcher;
+
+            if (ReflectionUtil.minecraftVersion() > 16) {
+                minecraftServer = ReflectionUtil.mcClass("server.MinecraftServer");
+                commandDispatcher = ReflectionUtil.mcClass("commands.CommandDispatcher");
+            } else {
+                minecraftServer = ReflectionUtil.nmsClass("MinecraftServer");
+                commandDispatcher = ReflectionUtil.nmsClass("CommandDispatcher");
+            }
+
+            Class<?> craftServer = ReflectionUtil.obcClass("CraftServer");
+            CONSOLE_FIELD = craftServer.getDeclaredField("console");
+            CONSOLE_FIELD.setAccessible(true);
+
+            GET_COMMAND_DISPATCHER_METHOD = Arrays.stream(minecraftServer.getDeclaredMethods())
+                    .filter(method -> method.getParameterCount() == 0)
+                    .filter(method -> commandDispatcher.isAssignableFrom(method.getReturnType()))
+                    .findFirst().orElseThrow(NoSuchMethodException::new);
+            GET_COMMAND_DISPATCHER_METHOD.setAccessible(true);
+
+            GET_BRIGADIER_DISPATCHER_METHOD = Arrays.stream(commandDispatcher.getDeclaredMethods())
+                    .filter(method -> method.getParameterCount() == 0)
+                    .filter(method -> CommandDispatcher.class.isAssignableFrom(method.getReturnType()))
+                    .findFirst().orElseThrow(NoSuchMethodException::new);
+            GET_BRIGADIER_DISPATCHER_METHOD.setAccessible(true);
+
+            Class<?> commandWrapperClass = ReflectionUtil.obcClass("command.BukkitCommandWrapper");
+            COMMAND_WRAPPER_CONSTRUCTOR = commandWrapperClass.getConstructor(craftServer, Command.class);
+
+            CUSTOM_SUGGESTIONS_FIELD = ArgumentCommandNode.class.getDeclaredField("customSuggestions");
+            CUSTOM_SUGGESTIONS_FIELD.setAccessible(true);
+
+            COMMAND_EXECUTE_FUNCTION_FIELD = CommandNode.class.getDeclaredField("command");
+            COMMAND_EXECUTE_FUNCTION_FIELD.setAccessible(true);
+
+            CHILDREN_FIELD = CommandNode.class.getDeclaredField("children");
+            LITERALS_FIELD = CommandNode.class.getDeclaredField("literals");
+            ARGUMENTS_FIELD = CommandNode.class.getDeclaredField("arguments");
+            CHILDREN_FIELDS = new Field[]{CHILDREN_FIELD, LITERALS_FIELD, ARGUMENTS_FIELD};
+            for (Field field : CHILDREN_FIELDS) {
+                field.setAccessible(true);
+            }
+
+            DUMMY_COMMAND = (ctx) -> { throw new UnsupportedOperationException(); };
+
+        } catch (ReflectiveOperationException e) {
+            throw new ExceptionInInitializerError(e);
+        }
+    }
+
+    private final Plugin plugin;
+    private final List<LiteralCommandNode<?>> registeredNodes = new ArrayList<>();
+
+    AdajencyImpl(Plugin plugin) {
+        this.plugin = plugin;
+        this.plugin.getServer().getPluginManager().registerEvents(new ServerReloadListener(this), this.plugin);
+    }
+
+    private CommandDispatcher<?> getDispatcher() {
+        try {
+            Object mcServerObject = CONSOLE_FIELD.get(Bukkit.getServer());
+            Object commandDispatcherObject = GET_COMMAND_DISPATCHER_METHOD.invoke(mcServerObject);
+            return (CommandDispatcher<?>) GET_BRIGADIER_DISPATCHER_METHOD.invoke(commandDispatcherObject);
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @SuppressWarnings({"rawtypes", "unchecked"})
+    @Override
+    public void register(LiteralCommandNode<?> node) {
+        Objects.requireNonNull(node, "node");
+
+        CommandDispatcher dispatcher = getDispatcher();
+        RootCommandNode root = dispatcher.getRoot();
+
+        removeChild(root, node.getName());
+        root.addChild(node);
+        this.registeredNodes.add(node);
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public void register(Command command, LiteralCommandNode<?> node, Predicate<? super Player> permissionTest) {
+        Objects.requireNonNull(command, "command");
+        Objects.requireNonNull(node, "node");
+        Objects.requireNonNull(permissionTest, "permissionTest");
+
+        try {
+            SuggestionProvider<?> wrapper = (SuggestionProvider<?>) COMMAND_WRAPPER_CONSTRUCTOR.newInstance(this.plugin.getServer(), command);
+            setRequiredHackyFieldsRecursively(node, wrapper);
+        } catch (Throwable e) {
+            e.printStackTrace();
+        }
+
+        Collection<String> aliases = getAliases(command);
+        if (!aliases.contains(node.getLiteral())) {
+            node = renameLiteralNode(node, command.getName());
+        }
+
+        for (String alias : aliases) {
+            if (node.getLiteral().equals(alias)) {
+                register(node);
+            } else {
+                register(LiteralArgumentBuilder.literal(alias).redirect((LiteralCommandNode<Object>)node).build());
+            }
+        }
+
+        this.plugin.getServer().getPluginManager().registerEvents(new CommandDataSendListener(command, permissionTest), this.plugin);
+    }
+
+    @Override
+    public void register(Command command, LiteralCommandNode<?> node) {
+        Objects.requireNonNull(command, "command");
+        Objects.requireNonNull(node, "node");
+
+        register(command, node, command::testPermissionSilent);
+    }
+
+    @SuppressWarnings({"unchecked", "rawtypes"})
+    private static void removeChild(RootCommandNode root, String name) {
+        try {
+            for (Field field : CHILDREN_FIELDS) {
+                Map<String, ?> children = (Map<String, ?>) field.get(root);
+                children.remove(name);
+            }
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static void setRequiredHackyFieldsRecursively(CommandNode<?> node, SuggestionProvider<?> suggestionProvider) {
+        // set command execution function so the server sets the executable flag on the command
+        try {
+            COMMAND_EXECUTE_FUNCTION_FIELD.set(node, DUMMY_COMMAND);
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+
+        if (node instanceof ArgumentCommandNode<?, ?> argumentNode) {
+
+            // set the custom suggestion provider field so tab completions work
+            try {
+                CUSTOM_SUGGESTIONS_FIELD.set(argumentNode, suggestionProvider);
+            } catch (IllegalAccessException e) {
+                e.printStackTrace();
+            }
+        }
+
+        for (CommandNode<?> child : node.getChildren()) {
+            setRequiredHackyFieldsRecursively(child, suggestionProvider);
+        }
+    }
+
+    private static <S> LiteralCommandNode<S> renameLiteralNode(LiteralCommandNode<S> node, String newLiteral) {
+        LiteralCommandNode<S> clone = new LiteralCommandNode<>(newLiteral, node.getCommand(), node.getRequirement(), node.getRedirect(), node.getRedirectModifier(), node.isFork());
+        for (CommandNode<S> child : node.getChildren()) {
+            clone.addChild(child);
+        }
+        return clone;
+    }
+
+    /**
+     * Listens for server (re)loads, and re-adds all registered nodes to the dispatcher.
+     */
+    private record ServerReloadListener(AdajencyImpl adajency) implements Listener {
+
+        @SuppressWarnings({"rawtypes", "unchecked"})
+        @EventHandler
+        public void onLoad(ServerLoadEvent e) {
+            CommandDispatcher dispatcher = this.adajency.getDispatcher();
+            RootCommandNode root = dispatcher.getRoot();
+
+            for (LiteralCommandNode<?> node : this.adajency.registeredNodes) {
+                removeChild(root, node.getName());
+                root.addChild(node);
+            }
+        }
+    }
+
+    /**
+     * Removes minecraft namespaced argument data, & data for players without permission to view the
+     * corresponding commands.
+     */
+    private static final class CommandDataSendListener implements Listener {
+        private final Set<String> aliases;
+        private final Set<String> minecraftPrefixedAliases;
+        private final Predicate<? super Player> permissionTest;
+
+        CommandDataSendListener(Command pluginCommand, Predicate<? super Player> permissionTest) {
+            this.aliases = new HashSet<>(getAliases(pluginCommand));
+            this.minecraftPrefixedAliases = this.aliases.stream().map(alias -> "minecraft:" + alias).collect(Collectors.toSet());
+            this.permissionTest = permissionTest;
+        }
+
+        @EventHandler
+        public void onCommandSend(PlayerCommandSendEvent e) {
+            // always remove 'minecraft:' prefixed aliases added by craftbukkit.
+            // this happens because bukkit thinks our injected commands are vanilla commands.
+            e.getCommands().removeAll(this.minecraftPrefixedAliases);
+
+            // remove the actual aliases if the player doesn't pass the permission test
+            if (!this.permissionTest.test(e.getPlayer())) {
+                e.getCommands().removeAll(this.aliases);
+            }
+        }
+    }
+
+    /**
+     * Gets the aliases known for the given command.
+     *
+     * <p>This will include the main label, as well as defined aliases, and
+     * aliases including the fallback prefix added by Bukkit.</p>
+     *
+     * @param command the command
+     * @return the aliases
+     */
+    private static Collection<String> getAliases(Command command) {
+        Objects.requireNonNull(command, "command");
+
+        Stream<String> aliasesStream = Stream.concat(
+                Stream.of(command.getLabel()),
+                command.getAliases().stream()
+        );
+
+        if (command instanceof PluginCommand) {
+            String fallbackPrefix = ((PluginCommand) command).getPlugin().getName().toLowerCase().trim();
+            aliasesStream = aliasesStream.flatMap(alias -> Stream.of(
+                    alias,
+                    fallbackPrefix + ":" + alias
+            ));
+        }
+
+        return aliasesStream.distinct().collect(Collectors.toList());
+    }
+
+    static void ensureSetup() {
+        // do nothing - this is only called to trigger the static initializer
+    }
+
+}

src/main/java/ru/d3st0ny/adajency/AdajencyProvider.java

@@ -0,0 +1,56 @@
+package ru.d3st0ny.adajency;
+
+import org.bukkit.plugin.Plugin;
+
+import java.util.Objects;
+
+/**
+ * Factory for obtaining instances of {@link Adajency}.
+ */
+public final class AdajencyProvider {
+    private AdajencyProvider() {
+        throw new AssertionError();
+    }
+
+    private static final Throwable SETUP_EXCEPTION = checkSupported();
+
+    private static Throwable checkSupported() {
+        try {
+            Class.forName("com.mojang.brigadier.CommandDispatcher");
+            AdajencyImpl.ensureSetup();
+            MinecraftArgumentType.ensureSetup();
+            return null;
+        } catch (Throwable e) {
+            if (System.getProperty("adajency.debug") != null) {
+                System.err.println("Exception while initialising adajency:");
+                e.printStackTrace(System.err);
+            }
+            return e;
+        }
+    }
+
+    /**
+     * Checks to see if the Brigadier command system is supported by the server.
+     *
+     * @return true if adajency is supported.
+     */
+    public static boolean isSupported() {
+        return SETUP_EXCEPTION == null;
+    }
+
+    /**
+     * Obtains a {@link Adajency} instance for the given plugin.
+     *
+     * @param plugin the plugin
+     * @return the adajency instance
+     * @throws BrigadierUnsupportedException if brigadier is not {@link #isSupported() supported}
+     * by the server.
+     */
+    public static Adajency getAdajency(Plugin plugin) throws BrigadierUnsupportedException {
+        Objects.requireNonNull(plugin, "plugin");
+        if (SETUP_EXCEPTION != null) {
+            throw new BrigadierUnsupportedException("Brigadier is not supported by the server.", SETUP_EXCEPTION);
+        }
+        return new AdajencyImpl(plugin);
+    }
+}

src/main/java/ru/d3st0ny/adajency/BrigadierUnsupportedException.java

@@ -0,0 +1,11 @@
+package ru.d3st0ny.adajency;
+
+/**
+ * Exception thrown when Brigadier is not supported by the server.
+ */
+public final class BrigadierUnsupportedException extends UnsupportedOperationException {
+
+    public BrigadierUnsupportedException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}

src/main/java/ru/d3st0ny/adajency/MinecraftArgumentType.java

@@ -0,0 +1,377 @@
+package ru.d3st0ny.adajency;
+
+import com.mojang.brigadier.arguments.ArgumentType;
+
+import java.lang.reflect.Constructor;
+import java.util.Arrays;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * An enumeration for containing Minecraft's built-in {@link ArgumentType}s
+ */
+@SuppressWarnings("rawtypes")
+public enum MinecraftArgumentType {
+
+    /**
+     * A selector, player name, or UUID.
+     * <p>
+     * Parameters:
+     * - boolean single
+     * - boolean playerOnly
+     */
+    Entity("ArgumentEntity", boolean.class, boolean.class),
+
+    /**
+     * A player, online or not. Can also use a selector, which may match one or more
+     * players (but not entities).
+     */
+    GameProfile("ArgumentProfile"),
+
+    /**
+     * A chat color. One of the names from <a href="https://wiki.vg/Chat#Colors">colors</a>, or {@code reset}.
+     * Case-insensitive.
+     */
+    Color("ArgumentChatFormat"),
+
+    /**
+     * A JSON Chat component.
+     */
+    Component("ArgumentChatComponent"),
+
+    /**
+     * A regular message, potentially including selectors.
+     */
+    Message("ArgumentChat"),
+
+    /**
+     * An NBT value, parsed using JSON-NBT rules. This represents a full NBT tag.
+     */
+    NBT("ArgumentNBTTag"),
+
+    /**
+     * Represents a partial NBT tag, usable in data modify command.
+     */
+    NBT_TAG("ArgumentNBTBase"),
+
+    /**
+     * A path within an NBT value, allowing for array and member accesses.
+     */
+    NBT_PATH("ArgumentNBTKey"),
+
+    /**
+     * A scoreboard objective.
+     */
+    ScoreboardObjective("ArgumentScoreboardObjective"),
+
+    /**
+     * A single score criterion.
+     */
+    ObjectiveCriteria("ArgumentScoreboardCriteria"),
+
+    /**
+     * A scoreboard operator.
+     */
+    ScoreboardSlot("ArgumentScoreboardSlot"),
+
+    /**
+     * Something that can join a team. Allows selectors and *.
+     */
+    ScoreHolder("ArgumentScoreholder"),
+
+    /**
+     * The name of a team. Parsed as an unquoted string.
+     */
+    Team("ArgumentScoreboardTeam"),
+
+    /**
+     * A scoreboard operator.
+     */
+    Operation("ArgumentMathOperation"),
+
+    /**
+     * A particle effect (an identifier with extra information following it for
+     * specific particles, mirroring the Particle packet)
+     */
+    Particle("ArgumentParticle"),
+
+    /**
+     * Represents an angle.
+     */
+    Angle("ArgumentAngle"),
+
+    /**
+     * A name for an inventory slot.
+     */
+    ItemSlot("ArgumentInventorySlot"),
+
+    /**
+     * An Identifier.
+     */
+    ResourceLocation("ArgumentMinecraftKeyRegistered"),
+
+    /**
+     * A potion effect.
+     */
+    PotionEffect("ArgumentMobEffect"),
+
+    /**
+     * Represents a item enchantment.
+     */
+    Enchantment("ArgumentEnchantment"),
+
+    /**
+     * Represents an entity summon.
+     */
+    EntitySummon("ArgumentEntitySummon"),
+
+    /**
+     * Represents a dimension.
+     */
+    Dimension("ArgumentDimension"),
+
+    /**
+     * Represents a time duration.
+     */
+    Time("ArgumentTime"),
+
+    /**
+     * Represents a UUID value.
+     *
+     * @since Minecraft 1.16
+     */
+    UUID("ArgumentUUID"),
+
+    /**
+     * A location, represented as 3 numbers (which must be integers). May use relative locations
+     * with ~
+     */
+    BlockPosition("coordinates.ArgumentPosition"),
+
+    /**
+     * A column location, represented as 3 numbers (which must be integers). May use relative locations
+     * with ~.
+     */
+    ColumnPosition("coordinates.ArgumentVec2I"),
+
+    /**
+     * A location, represented as 3 numbers (which may have a decimal point, but will be moved to the
+     * center of a block if none is specified). May use relative locations with ~.
+     */
+    Vector3D("coordinates.ArgumentVec3"),
+
+    /**
+     * A location, represented as 2 numbers (which may have a decimal point, but will be moved to the center
+     * of a block if none is specified). May use relative locations with ~.
+     */
+    Vector2D("coordinates.ArgumentVec2"),
+
+    /**
+     * An angle, represented as 2 numbers (which may have a decimal point, but will be moved to the
+     * center of a block if none is specified). May use relative locations with ~.
+     */
+    Rotation("coordinates.ArgumentRotation"),
+
+    /**
+     * A collection of up to 3 axes.
+     */
+    Swizzle("coordinates.ArgumentRotationAxis"),
+
+    /**
+     * A block state, optionally including NBT and state information.
+     */
+    BlockState("blocks.ArgumentTile"),
+
+    /**
+     * A block, or a block tag.
+     */
+    BlockPredicate("blocks.ArgumentBlockPredicate"),
+
+    /**
+     * An item, optionally including NBT.
+     */
+    ItemStack("item.ArgumentItemStack"),
+
+    /**
+     * An item, or an item tag.
+     */
+    ItemPredicate("item.ArgumentItemPredicate"),
+
+    /**
+     * A function.
+     */
+    Function("item.ArgumentTag"),
+
+    /**
+     * The entity anchor related to the facing argument in the teleport command,
+     * is feet or eyes.
+     */
+    EntityAnchor("ArgumentAnchor"),
+
+    /**
+     * An integer range of values with a min and a max.
+     */
+    IntRange("ArgumentCriterionValue$b"),
+
+    /**
+     * A floating-point range of values with a min and a max.
+     */
+    FloatRange("ArgumentCriterionValue$a"),
+
+    /**
+     * Template mirror
+     *
+     * @since Minecraft 1.19
+     */
+    TemplateMirror("TemplateMirrorArgument"),
+
+    /**
+     * Template rotation
+     *
+     * @since Minecraft 1.19
+     */
+    TemplateRotation("TemplateRotationArgument");
+
+    /**
+     * A ready-to-use instance used for singleton argument types
+     */
+    private ArgumentType<?> argumentType;
+    private Constructor<? extends ArgumentType> argumentConstructor;
+    private final Class<?>[] parameters;
+
+    MinecraftArgumentType(String name, Class<?>... parameters) {
+        Class<?> argumentClass = resolveArgumentClass(name);
+        this.parameters = parameters;
+        if (argumentClass == null) {
+            argumentType = null;
+            argumentConstructor = null;
+            return;
+        }
+        try {
+            argumentConstructor = argumentClass.asSubclass(ArgumentType.class).getDeclaredConstructor(parameters);
+            if (!argumentConstructor.isAccessible())
+                argumentConstructor.setAccessible(true);
+            if (parameters.length == 0) {
+                argumentType = argumentConstructor.newInstance();
+            } else {
+                argumentType = null;
+            }
+        } catch (Throwable e) {
+            argumentType = null;
+            argumentConstructor = null;
+        }
+    }
+
+    /**
+     * Checks if this argument type is supported in this Minecraft version
+     *
+     * @return If this is supported
+     */
+    public boolean isSupported() {
+        return argumentConstructor != null;
+    }
+
+    /**
+     * Checks if this argument type requires parameters
+     *
+     * @return If this requires parameters
+     */
+    public boolean requiresParameters() {
+        return parameters.length != 0;
+    }
+
+    /**
+     * Returns the argument type represented by this enum value, otherwise
+     * throws an exception
+     *
+     * @param <T> The argument type
+     * @return The argument type
+     * @throws IllegalArgumentException if not supported in this version
+     * @throws IllegalArgumentException if this argument requires arguments. See {@link #create(Object...)}
+     */
+    public <T> ArgumentType<T> get() {
+        if (argumentConstructor == null)
+            throw new IllegalArgumentException("Argument type '" + name().toLowerCase() + "' is not available on this version.");
+        if (argumentType != null)
+            return (ArgumentType<T>) argumentType;
+        throw new IllegalArgumentException("This argument type requires " + parameters.length + " parameter(s) of type(s) " +
+                Arrays.stream(parameters).map(Class::getName).collect(Collectors.joining(", ")) + ". Use #create() instead.");
+    }
+
+    /**
+     * Creates an instance of this argument type
+     *
+     * @param arguments Arguments to construct the argument type with
+     * @param <T>       The argument ttype
+     * @return The created argument type.
+     * @throws IllegalArgumentException if not supported in this version
+     */
+    public <T> ArgumentType<T> create(Object... arguments) {
+        if (argumentConstructor == null)
+            throw new IllegalArgumentException("Argument type '" + name().toLowerCase() + "' is not available on this version.");
+        if (argumentType != null && arguments.length == 0)
+            return (ArgumentType<T>) argumentType;
+        try {
+            return argumentConstructor.newInstance(arguments);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Returns the argument type represented by this enum value, wrapped
+     * inside an {@link Optional}
+     *
+     * @param <T> The argument type
+     * @return The argument type optional
+     * @throws IllegalArgumentException if this argument requires arguments. See {@link #createIfPresent(Object...)}
+     */
+    public <T> Optional<ArgumentType<T>> getIfPresent() {
+        if (argumentConstructor == null)
+            return Optional.empty();
+        if (argumentType != null)
+            return Optional.of((ArgumentType<T>) argumentType);
+        throw new IllegalArgumentException("This argument type requires " + parameters.length + " parameter(s) of type(s) " +
+                Arrays.stream(parameters).map(Class::getName).collect(Collectors.joining(", ")) + ". Use #createIfPresent() instead.");
+    }
+
+    /**
+     * Creates an instance of this argument type, wrapped in an optional.
+     *
+     * @param arguments Arguments to construct the argument type with
+     * @param <T>       The argument ttype
+     * @return The created argument type optional.
+     */
+    public <T> Optional<ArgumentType<T>> createIfPresent(Object... arguments) {
+        if (argumentConstructor == null)
+            return Optional.empty();
+        if (argumentType != null && arguments.length == 0)
+            return Optional.of((ArgumentType<T>) argumentType);
+        try {
+            return Optional.of(argumentConstructor.newInstance(arguments));
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private static Class<?> resolveArgumentClass(String name) {
+        try {
+            if (ReflectionUtil.minecraftVersion() > 16) {
+                return ReflectionUtil.mcClass("commands.arguments." + name);
+            } else {
+                String stripped;
+                if (name.lastIndexOf('.') != -1)
+                    stripped = name.substring(name.lastIndexOf('.'));
+                else
+                    stripped = name;
+                return ReflectionUtil.nmsClass(stripped);
+            }
+        } catch (Throwable t) {
+            return null;
+        }
+    }
+
+    public static void ensureSetup() {
+        // do nothing - this is only called to trigger the static initializer
+    }
+}

src/main/java/ru/d3st0ny/adajency/ReflectionUtil.java

@@ -0,0 +1,63 @@
+package ru.d3st0ny.adajency;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.bukkit.Bukkit;
+
+final class ReflectionUtil {
+    private static final String SERVER_VERSION = getServerVersion();
+
+    private static String getServerVersion() {
+        Class<?> server = Bukkit.getServer().getClass();
+        if (!server.getSimpleName().equals("CraftServer")) {
+            return ".";
+        }
+        if (server.getName().equals("org.bukkit.craftbukkit.CraftServer")) {
+            // Non versioned class
+            return ".";
+        } else {
+            String version = server.getName().substring("org.bukkit.craftbukkit".length());
+            return version.substring(0, version.length() - "CraftServer".length());
+        }
+    }
+
+    public static String mc(String name) {
+        return "net.minecraft." + name;
+    }
+
+    public static String nms(String className) {
+        return "net.minecraft.server" + SERVER_VERSION + className;
+    }
+
+    public static Class<?> mcClass(String className) throws ClassNotFoundException {
+        return Class.forName(mc(className));
+    }
+
+    public static Class<?> nmsClass(String className) throws ClassNotFoundException {
+        return Class.forName(nms(className));
+    }
+
+    public static String obc(String className) {
+        return "org.bukkit.craftbukkit" + SERVER_VERSION + className;
+    }
+
+    public static Class<?> obcClass(String className) throws ClassNotFoundException {
+        return Class.forName(obc(className));
+    }
+
+    public static int minecraftVersion() {
+        try {
+            final Matcher matcher = Pattern.compile("\\(MC: (\\d)\\.(\\d+)\\.?(\\d+?)?( .*)?\\)").matcher(Bukkit.getVersion());
+            if (matcher.find()) {
+                return Integer.parseInt(matcher.toMatchResult().group(2), 10);
+            } else {
+                throw new IllegalArgumentException(String.format("No match found in '%s'", Bukkit.getVersion()));
+            }
+        } catch (final IllegalArgumentException ex) {
+            throw new RuntimeException("Failed to determine Minecraft version", ex);
+        }
+    }
+
+    private ReflectionUtil() {}
+
+}