A simple "leave server command" made for Bramble from the AvaIre Central Discord server.

LeaveServerCommand.java

package com.avairebot.commands.system;

import com.avairebot.AvaIre;
import com.avairebot.commands.CommandMessage;
import com.avairebot.contracts.commands.SystemCommand;
import net.dv8tion.jda.core.entities.Guild;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class LeaveServerCommand extends SystemCommand {

    public LeaveServerCommand(AvaIre avaire) {
        super(avaire, false);
    }

    @Override
    public String getName() {
        return "Leave Server Command";
    }

    @Override
    public String getDescription() {
        return "Leaves the server the command was executed in, or the given ID.";
    }

    @Override
    public List<String> getTriggers() {
        return Collections.singletonList("leave");
    }

    @Override
    public List<String> getUsageInstructions() {
        return Arrays.asList(
            "`:command` - Leaves the server the command was run in.",
            "`:command <server id>` - Leaves the server with the give id."
        );
    }

    @Override
    public boolean onCommand(CommandMessage context, String[] args) {
        if (args.length == 0) {
            context.makeInfo("Leaving the server now, goodbye :wave:")
                .queue(ignored -> context.getGuild().leave().queue());
            return true;
        }

        try {
            Guild guildById = avaire.getShardManager().getGuildById(args[0]);
            if (guildById == null) {
                return sendErrorMessage(context, "Invalid guild ID given, you must give me a valid ID for the guild you want me to leave!");
            }

            context.makeInfo("Leaving :name :wave:")
                .set("name", guildById.getName())
                .queue(ignored -> guildById.leave().queue());
        } catch (NumberFormatException e) {
            return sendErrorMessage(context, "Invalid guild ID given, you must give me a valid ID for the guild you want me to leave!");
        }

        return true;
    }
}