Adding a subcommand

This guide is for PlotSquared versions <= 1.12.2

Registering a sub command will have it show up when a user types in
/plot help <category> - where category is the category of your command

Adding a command

The following is an example

@CommandDeclaration(
    // The name of the command
    command = "test",
    
    // The permission
    permission = "plots.music",
    
    // The command description
    description = "Player music in a plot",
    
    // The usage message
    usage = "/plot music",
    
    // The command category
    category = CommandCategory.ACTIONS,
    
    // The required command caller (NONE allows console, which would pass ConsolePlayer for the PlotPlayer)
    requiredType = RequiredType.NONE
)
public class TestCommand extends SubCommand {
        public TestCommand() {
            // You can register the command here, or somewhere else
            MainCommand.getInstance().addCommand(this);
            
            // Then just call:
            // new TestCommand();
            // And in game use: /plot test
        }

        // What happens when the command is executed:
    @Override
    public boolean onCommand(final PlotPlayer player, final String[] args) {
        Location loc = player.getLocation();
        Plot plot = Plot plot1 = MainUtil.getPlot(loc);
        if (plot1 == null) {
            sendMessage(player, C.NOT_IN_PLOT);
            return false;
        }
        Plot plot = MainUtil.getCurrentPlot(plr);
        MainUtil.sendMessage(player, "You are in plot " + plot.getId());
        return true;
    }
}

Dynamic command creation

Command<PlotPlayer> cmd = new Command<PlotPlayer>(String command, String usage, String description, String permission, String[] aliases, RequiredType requiredType) {

    @Override
    public boolean onCommand(PlotPlayer plr, String[] arguments) {
        Location loc = player.getLocation();
        Plot plot = Plot plot1 = MainUtil.getPlot(loc);
        if (plot1 == null) {
            sendMessage(player, C.NOT_IN_PLOT);
            return false;
        }
        Plot plot = MainUtil.getCurrentPlot(plr);
        MainUtil.sendMessage(player, "You are in plot " + plot.getId());
        return true;
    }
};

MainCommand.getInstance().addCommand(cmd);