first commit

src/main/java/me/monster/commands/CommandManager.java

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+package me.monster.commands;
+
+import org.bukkit.command.CommandMap;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.Nullable;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.Field;
+import java.lang.reflect.InvocationTargetException;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class CommandManager {
+
+    /**
+     * @param plugin             An instance of your plugin that is using this API. If called within plugin main class, provide this keyword
+     * @param commandName        The name of the command
+     * @param commandDescription Description of command as would put it in plugin.yml
+     * @param commandUsage       Usage of command as would put it in plugin.yml
+     * @param aliases            A String list of aliases(or nothing for overloaded method)
+     * @param subcommands        Class reference to each SubCommand you create for this core command
+     */
+    @SafeVarargs
+    public static void createCoreCommand(JavaPlugin plugin,
+                                         String commandName,
+                                         String commandDescription,
+                                         String commandUsage,
+                                         @Nullable CommandList commandList,
+                                         List<String> aliases,
+                                         Class<? extends SubCommand>... subcommands) throws NoSuchFieldException, IllegalAccessException {
+
+        ArrayList<SubCommand> commands = new ArrayList<>();
+
+        Arrays.stream(subcommands).map(subcommand -> {
+            try {
+                Constructor<? extends SubCommand> constructor = subcommand.getConstructor();
+                return constructor.newInstance();
+            } catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) {
+                e.printStackTrace();
+            }
+            return null;
+        }).forEach(commands::add);
+
+        //THANK YOU OZZYMAR <3 YOU'RE THE HOMIE
+        Field commandField = plugin.getServer().getClass().getDeclaredField("commandMap");
+        commandField.setAccessible(true);
+        CommandMap commandMap = (CommandMap) commandField.get(plugin.getServer());
+        commandMap.register(commandName, new CoreCommand(commandName, commandDescription, commandUsage, commandList, aliases, commands));
+    }
+
+
+    /**
+     * @param plugin             An instance of your plugin that is using this API. If called within plugin main class, provide this keyword
+     * @param commandName        The name of the command
+     * @param commandDescription Description of command as would put it in plugin.yml
+     * @param commandUsage       Usage of command as would put it in plugin.yml
+     * @param subcommands        Class reference to each SubCommand you create for this core command
+     */
+    @SafeVarargs
+    public static void createCoreCommand(JavaPlugin plugin,
+                                         String commandName,
+                                         String commandDescription,
+                                         String commandUsage,
+                                         @Nullable CommandList commandList,
+                                         Class<? extends SubCommand>... subcommands) throws NoSuchFieldException, IllegalAccessException {
+        createCoreCommand(plugin, commandName, commandDescription, commandUsage, commandList, Collections.singletonList(""), subcommands);
+    }
+
+}