Rubydesic/MinecraftPicocli

Allows using PicoCLI as a Minecraft Forge command framework

MinecraftPicocli

This library allows you to use the PicoCLI command framework with Minecraft Forge.

Installation

Add this to your dependencies in build.gradle:

repositories {
    maven { url 'https://jitpack.io' }
}
dependencies {
    compile 'com.github.Rubydesic:MinecraftPicocli:master-SNAPSHOT'
}

First Command

To start, make a PicoCLI command. For example, a very basic echo command might look like this:

@Command(name = "command", aliases = {"cmd", "mycommand"})
public class MyCommand implements Runnable {
    
    @Inject
    ICommandSender sender;
    
    @Parameters(index = "0")
    String echo;
    
    @Override
    public void run() {
        sender.sendMessage(new TextComponentString("You said " + echo));
    }
    
}

Now, simply register your command as you would any other using the FMLServerStartingEvent

@EventHandler
public void onServerStart(FMLServerStartingEvent event) {
    ServerCommandManager manager = 
        (ServerCommandManager) event.getServer().getCommandManager();
    
    manager.registerCommand(new PicocliCommandBase<>(MyCommand.class));
}

Try out your command:

/command "hello there, buddy"
> You said hello there buddy

Autocompletion

Let's say you want to autocomplete a player name. First, you'll need an autocompletion class that implements Iterable<String>:

public class AutocompleterPlayername implements Iterable<String> {
    
    @Inject
    ICommandSender sender;
    
    @Override
    public Iterator<String> iterator() {
        return sender.playerEntities // List<EntityPlayer>
            .stream() // Stream<EntityPlayer>
            .map(EntityPlayer::getName) // Stream<String>
            .iterator(); // Iterator<String>
    }
    
}

Perfect. Here's how you use this autocompletion class in your command so that the playerName parameter is autocompleted:

@Command(name = "isplayeronground")
public class MyCommand implements Runnable {
    
    @Inject
    ICommandSender sender;
    
    @Parameters(index = "0", completionCandidates = AutocompleterPlayername.class)
    String playerName;
    
    @Override
    public void run() {
        EntityPlayer player = sender.getEntityWorld().getPlayerEntityByName(playerName);
        
        sender.sendMessage(new TextComponentString(player.onGround ? "Yes" : "No"));
    }
    
}

Try it out:

/isplayeronground Rub<tab>
/isplayeronground Rubydesic
> Yes

Obtaining ICommandSender

Every class constructed by PicoCLI (autocompletion classes, converter classes, command classes) will have the ICommandSender associated with it passed in two different ways.

1. Constructor injection

   public class MyCommandOrConverterOrWhatever {
       
       ICommandSender sender;
       
       MyCommandOrConverterOrWhatever(ICommandSender sender) {
           this.sender = sender;
       }
       
   }

2. Field injection using @Inject annotation

   public class MyCommandOrConverterOrWhatever {
       
       @Inject
       ICommandSender sender;
       
   }

   ---

   NOTE: The constructor is called BEFORE the field injection is performed

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