SelectEverywhere

Look At Me: .............. ... ...........I'm the description field.
Dependencies: ........... .... .......Latest version of Spigot 1.13.2

This is a demo plugin to show the new selector API. It will replace any @ selectors in commands that match a single entity with the entity's name (if player), or otherwise it's UUID.

Source Code:

package net.md_5;

import com.google.common.base.Joiner;
import java.util.List;
import java.util.logging.Level;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.EventPriority;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerCommandPreprocessEvent;
import org.bukkit.event.server.ServerCommandEvent;
import org.bukkit.plugin.java.JavaPlugin;

public class SelectEverywhere extends JavaPlugin implements Listener
{

    private boolean debug;

    @Override
    public void onEnable()
    {
        getConfig().addDefault( "debug", false );
        getConfig().options().copyDefaults( true );
        saveConfig();

        debug = getConfig().getBoolean( "debug" );

        getServer().getPluginManager().registerEvents( this, this );
    }

    private String handle(CommandSender sender, String command)
    {
        String[] args = command.split( " " );

        for ( int i = 0; i < args.length; i++ )
        {
            String arg = args[i];

            if ( arg.startsWith( "@" ) )
            {
                try
                {
                    List<Entity> selected = getServer().selectEntities( sender, arg );

                    if ( selected.size() == 1 )
                    {
                        Entity entity = selected.iterator().next();
                        args[i] = ( entity instanceof Player ) ? entity.getName() : entity.getUniqueId().toString();
                    } else
                    {
                        if ( debug )
                        {
                            getLogger().log( Level.INFO, "{2}: Could not select entities from {0} (got {1} entities)", new Object[]
                            {
                                arg, selected.size(), sender
                            } );
                        }
                    }
                } catch ( IllegalArgumentException ex )
                {
                    if ( debug )
                    {
                        getLogger().log( Level.INFO, "{1}: Ignored unparseable selector {0}", new Object[]
                        {
                            arg, sender
                        } );
                    }
                }
            }
        }

        return Joiner.on( ' ' ).join( args );
    }

    @EventHandler(priority = EventPriority.LOWEST)
    public void command(PlayerCommandPreprocessEvent event)
    {
        event.setMessage( handle( event.getPlayer(), event.getMessage() ) );
    }

    @EventHandler(priority = EventPriority.LOWEST)
    public void command(ServerCommandEvent event)
    {
        event.setCommand( handle( event.getSender(), event.getCommand() ) );
    }
}