example

HelpCommand.java

package org.heat.world.commands.implementations.created;

import org.heat.world.commands.Command;
import org.heat.world.commands.CommandAction;
import org.heat.world.commands.CommandManager;
import org.heat.world.commands.CommandSender;
import org.heat.world.commands.implementations.DefaultCommand;

import javax.inject.Inject;
import java.util.List;

/**
 * Managed by romain on 25/02/2015.
 */
public class HelpCommand extends DefaultCommand {
    @Inject
    public HelpCommand(CommandManager manager) {
        super('!', "help", new CommandAction() {
            @Override
            public void execute(CommandSender sender, String[] args) {
                String commandName = args[0];
                
                if(!commandName.isEmpty()) {
                    Command command = manager.getCommandByNameOrAlias(commandName);
                    
                    if(command == null)
                        sender.reply("La commande est introuvable: !help pour la liste");
                    else {
                        StringBuilder text = new StringBuilder("\nSyntax:");

                        String main = command.getPrefix() + command.getName() + " ";
                        command.getSubCommands().keySet().forEach((sub) -> text.append("\n").append(main).append(sub));

                        sender.reply(text.toString());
                    }
                    return;
                }
                
                StringBuilder list = new StringBuilder("\nCommandes disponibles:");

                List<Command> commands = manager.getCommandsByRankAsList(sender.getRank());
                commands.stream().forEach((command) -> list.append("\n- ").append(command.getPrefix()).append(command.getName()));

                sender.reply(list.toString());
            }
        });

        addAlias("!commands");
        addArgument("command", false);
    }
}