add command suggestions i guess

src/main/java/land/chipmunk/chayapak/chomens_bot/Bot.java

@@ -63,6 +63,7 @@ public class Bot {
     @Getter private MazePlugin maze;
     @Getter private ExploitsPlugin exploits;
     @Getter private FilterPlugin filter;
+    @Getter private CommandSuggestionPlugin commandSuggestion;
 
     public Bot (Configuration.BotOption botOption, List<Bot> bots, Configuration config) {
         this.host = botOption.host;
@@ -105,6 +106,7 @@ public class Bot {
         this.maze = new MazePlugin(this);
         this.exploits = new ExploitsPlugin(this);
         this.filter = new FilterPlugin(this);
+        this.commandSuggestion = new CommandSuggestionPlugin(this);
 
         reconnect();
     }

src/main/java/land/chipmunk/chayapak/chomens_bot/plugins/CommandSuggestionPlugin.java

@@ -0,0 +1,61 @@
+package land.chipmunk.chayapak.chomens_bot.plugins;
+
+import land.chipmunk.chayapak.chomens_bot.Bot;
+import land.chipmunk.chayapak.chomens_bot.command.Command;
+import lombok.Getter;
+import lombok.Setter;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.JoinConfiguration;
+import net.kyori.adventure.text.TextComponent;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class CommandSuggestionPlugin extends ChatPlugin.ChatListener {
+    private final Bot bot;
+
+    @Getter @Setter private String id = "chomens_bot_command_suggestion";
+
+    public CommandSuggestionPlugin (Bot bot) {
+        this.bot = bot;
+        bot.chat().addListener(this);
+    }
+
+    @Override
+    public void systemMessageReceived(Component component) {
+        try {
+            final String tag = ((TextComponent) component).content();
+
+            if (!tag.equals(id)) return;
+
+            final List<Component> children = component.children();
+
+            if (children.size() < 2) return;
+
+            final int transactionId = Integer.parseInt(((TextComponent) children.get(0)).content());
+            final String player = ((TextComponent) children.get(1)).content();
+
+            Component inputComponent;
+            try {
+                inputComponent = children.get(2);
+            } catch (IndexOutOfBoundsException e) {
+                inputComponent = Component.text("");
+            }
+            final String input = ((TextComponent) inputComponent).content();
+
+            System.out.println("input is \"" + input + "\"");
+
+            final List<Component> output = new ArrayList<>();
+            output.add(Component.text(id));
+            output.add(Component.text(transactionId));
+
+            for (Command command : bot.commandHandler().commands()) {
+                if (!command.name().startsWith(input)) continue;
+
+                output.add(Component.text(command.name()));
+            }
+
+            bot.chat().tellraw(Component.join(JoinConfiguration.noSeparators(), output), player);
+        } catch (Exception ignored) {}
+    }
+}