ScriptCraft

A Minecraft mod that lets you build using Javascript.

(Update 2013/01/04 - I've created a Bukkit Plugin as this makes installing the mod much easier - assuming you're running a CraftBukkit server - which I recommend. See Bukkit Support for details).

Description

The ScriptCraft mod lets you enter javascript commands at the in-game prompt. To bring up the in-game prompt press the / key then type js followed by any javascript statement. E.g. /js 1+1 will print 2. ScriptCraft uses Rhino (The built-in javascript interpreter that comes with current versions of Java).

As of Dec 27 2012, the ScriptCraft mod includes just a few built-in objects and functions to make building easier.

• echo( message ) - displays a message on the player's screen. e.g. /js echo( 1 + 3 ) or /js echo ("Hello World")
• getMousePos() - A function which returns the current position of the cross-hairs (if a block is targeted)
• getPlayerPos() - A function which returns the current position of the player.
• putBlock( x, y, z, blockId, metaData ) - A function which lets you place a block anywhere (if no coordinates are given the block the player is currently looking at is replaced).
• getBlock( x, y, z ) - returns the blockId and metadata at the given location (if no coordinates are given the cross-hair location is used)
• putSign( String[] texts, x, y, z, blockId, metaData ) - A function which lets you place a sign.

The above primitives can be used to create buildings which would otherwise be time-consuming to create manually. It is highly recommended using the attached [drone][drone] javascript plugin which provides a fluent API for building. The Javascript Drone class provides a much richer API which can be used to construct buildings. See the attached [cottage.js][cottage] file for an example of how to load and use the drone.js module.

[drone][https://github.com/walterhiggins/ScriptCraft/tree/master/js-plugins/drone] [cottage][https://github.com/walterhiggins/ScriptCraft/tree/master/js-plugins/drone/cottage.js]

Functions in MCP version of Scriptcraft (no longer supported).

• help() - Brings up a short help message.
• load('path-to-script.js') - lets you load and execute any javascript source file. In the context of script files, the __script variable will refer to the current script filename and __folder refers to the directory in which the current script resides. In the MCP (Minecraft Coder Pack) version of ScriptCraft, calling load() with no parameters will bring up a File Chooser dialog. This feature was removed from the multi-player bukkit version of ScriptCraft.

Prerequisites

(Minecraft Coder Pack Only - Bukkit users go here )

You will need to install Rhino (A javascript implementation for java) if it is not already installed. Type...

java org.mozilla.javascript.tools.shell.Main 

... at a command prompt to see if Rhino is already installed. If Rhino is installed you should see the following...

js> 

If Rhino is not already installed you can download it, unzip it and copy the js.jar file to ...

• Macintosh - /System/Library/Java/Extensions/
• Windows - C:\jdk\jre\lib\ext (assuming the Java Dev Kit has been installed in c:\jdk)
• Linux (Ubuntu) - /usr/lib/jvm/java-6-openjdk-i386/jre/lib/ext/ or /usr/lib/jvm/java-7-oracle/jre/lib/ext/ for Oracle Java

You will also need to install the Minecraft Coder Pack (CraftBukkit Users - please skip this section and go here instead) and be comfortable installing a Minecraft Mod. You can get the Minecraft Coder Pack here...

http://mcp.ocean-labs.de/index.php/Main_Page

... You will need to follow MCP's instructions to decompile your minecraft.jar file.

Installing

(Minecraft Coder Pack only - Bukkit users go here. )

Once you've installed Minecraft Coder Pack (MCP) and Rhino...

1. Copy the CommandScript.java file to the src/minecraft/net/minecraft/src/ located in the directory where you installed MCP.

2. Create a new directory called ScriptCraft on your C:\ drive (Windows) or your home directory (Linux/Max), and copy all of the .js files provided.

3. If you are on a Windows computer ...

   1. Launch Notepad (or your favourite text editor) and open file src/minecraft/net/minecraft/src/ServerCommandManager.java
   2. Insert a new line after this.registerCommand(new CommandTime());
   3. type this.registerCommand(new CommandScript());
   4. Save the file and close the editor.

4. If you are on a Linux or Mac OS X computer...

   1. Copy ServerCommandManager.patch to the directory where you installed MCP.
   2. Open a terminal window and cd to the directory where you installed MCP.
   3. enter the following command patch src/minecraft/net/minecraft/src/ServerCommandManager.java ServerCommandManager.patch

5. Open a Command Prompt (windows) or Terminal (Linux/Mac), go to the MCP directory and run recompile.bat (windows) or ./recompile.sh (Linux/Mac)

6. Run reobfuscate.bat (windows) or ./reobfuscate.sh (Linux/Mac).

7. Follow MCP's instructions for copying the obfuscated files and rebuilding the minecraft.jar file that is in %appdata%/minecraft/bin (windows), ~/Library/Application Support/Minecraft/bin (Mac) or ~/.minecraft/bin (Linux).

Getting Started

(Minecraft Coder pack version only - Bukkit users go here ) Once you've installed the mod, launch Minecraft and type /js load() and load the cottage.js file. Once the cottage.js file is loaded you can create a new cottage by typing /js cottage(). Take a look over the cottage.js file to see how the Drone module can be used to easily create buildings. You can even create a whole row of cottages using the following in-game command...

/js load("./cottage"); // path may vary on your machine
/js d = new Drone(); for (i=0; i < 20;i++){ cottage(d).right(10);}

The above code loads the example blueprint for a cottage and uses a for loop to create multiple cottages from the blueprint. Keep a Minecraft Block reference handy - there's one here ...

http://www.minecraftinfo.com/idlist.htm

Further Reading

You can find more information about ScriptCraft on my blog.