Command system rewrite using Drink and Maven support.

src/main/java/net/nuggetmc/ai/commands/CommandHandler.java

@@ -0,0 +1,45 @@
+package net.nuggetmc.ai.commands;
+
+import com.jonahseguin.drink.CommandService;
+import com.jonahseguin.drink.Drink;
+import com.jonahseguin.drink.annotation.Command;
+import com.jonahseguin.drink.command.DrinkCommandContainer;
+import com.jonahseguin.drink.command.DrinkCommandService;
+import net.nuggetmc.ai.PlayerAI;
+import net.nuggetmc.ai.commands.commands.PlayerAICommand;
+import org.bukkit.ChatColor;
+
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class CommandHandler {
+
+    private final DrinkCommandService drink;
+
+    public CommandHandler() {
+        drink = (DrinkCommandService) Drink.get(PlayerAI.getInstance());
+        drink.register(new PlayerAICommand(this), "playerai", "pai");
+        drink.registerCommands();
+    }
+
+    public List<String> getUsage(Class<? extends CommandInstance> clazz) {
+        return getSubCommands(clazz).stream().map(c -> {
+            Command command = c.getAnnotation(Command.class);
+            return ChatColor.GRAY + " ▪ " + ChatColor.YELLOW + "/" + getRootName(clazz) + (command.name().isEmpty() ? "" : " " + command.name()) + ChatColor.GRAY + " ▪ "
+                    + ChatColor.RESET + command.desc();
+        }).collect(Collectors.toList());
+    }
+
+    private String getRootName(Class<? extends CommandInstance> clazz) {
+        return drink.getCommands().entrySet().stream()
+                .filter(c -> c.getValue().getObject().getClass().isAssignableFrom(clazz)).map(Map.Entry::getKey).findFirst().orElse(null);
+    }
+
+    private List<Method> getSubCommands(Class<? extends CommandInstance> clazz) {
+        return Arrays.stream(clazz.getDeclaredMethods()).filter(m -> m.isAnnotationPresent(Command.class)).collect(Collectors.toList());
+    }
+
+}