scriptcraft/docs/API-Reference.md

# ScriptCraft API Reference

Walter Higgins

[walter.higgins@gmail.com][email]

[email]: mailto:walter.higgins@gmail.com?subject=ScriptCraft_API_Reference

## Table of Contents
 * [Modules in Scriptcraft](#modules-in-scriptcraft)
 * [Module Loading](#module-loading)
   * [The plugins directory](#the-plugins-directory)
   * [The modules directory](#the-modules-directory)
   * [The lib directory](#the-lib-directory)
   * [plugins sub-directories](#plugins-sub-directories)
 * [Global variables](#global-variables)
   * [__plugin variable](#__plugin-variable)
   * [server variable](#server-variable)
   * [self variable](#self-variable)
   * [config variable](#config-variable)
   * [events variable](#events-variable)
 * [Module variables](#module-variables)
   * [__filename variable](#__filename-variable)
   * [__dirname variable](#__dirname-variable)
 * [Global functions](#global-functions)
   * [echo function](#echo-function)
   * [require() function](#require-function)
   * [load() function](#load-function)
   * [save() function](#save-function)
   * [plugin() function](#plugin-function)
   * [command() function](#command-function)
   * [setTimeout() function](#settimeout-function)
   * [clearTimeout() function](#cleartimeout-function)
   * [setInterval() function](#setinterval-function)
   * [clearInterval() function](#clearinterval-function)
   * [refresh() function](#refresh-function)
   * [addUnloadHandler() function](#addunloadhandler-function)
 * [require - Node.js-style module loading in ScriptCraft](#require---nodejs-style-module-loading-in-scriptcraft)
   * [math.js](#mathjs)
   * [inc.js](#incjs)
   * [program.js](#programjs)
   * [Important](#important)
   * [module name resolution](#module-name-resolution)
 * [events Module](#events-module)
   * [events.on() static method](#eventson-static-method)
 * [console global variable](#console-global-variable)
   * [Example](#example)
   * [Using string substitutions](#using-string-substitutions)
 * [Blocks Module](#blocks-module)
   * [Examples](#examples)
 * [Fireworks Module](#fireworks-module)
   * [Examples](#examples-1)
 * [Http Module](#http-module)
   * [http.request() function](#httprequest-function)
 * [Signs Module](#signs-module)
   * [signs.menu() function](#signsmenu-function)
   * [signs.getTargetedBy() function](#signsgettargetedby-function)
 * [Utilities Module](#utilities-module)
   * [utils.player() function](#utilsplayer-function)
   * [utils.locationToJSON() function](#utilslocationtojson-function)
   * [utils.locationToString() function](#utilslocationtostring-function)
   * [utils.locationFromJSON() function](#utilslocationfromjson-function)
   * [utils.getPlayerPos() function](#utilsgetplayerpos-function)
   * [utils.getMousePos() function](#utilsgetmousepos-function)
   * [utils.foreach() function](#utilsforeach-function)
   * [utils.nicely() function](#utilsnicely-function)
   * [utils.at() function](#utilsat-function)
   * [utils.find() function](#utilsfind-function)
 * [Drone Plugin](#drone-plugin)
   * [TLDNR; (Just read this if you're impatient)](#tldnr-just-read-this-if-youre-impatient)
   * [Constructing a Drone Object](#constructing-a-drone-object)
   * [Drone.box() method](#dronebox-method)
   * [Drone.box0() method](#dronebox0-method)
   * [Drone.boxa() method](#droneboxa-method)
   * [Drone Movement](#drone-movement)
   * [Drone Positional Info](#drone-positional-info)
   * [Drone Markers](#drone-markers)
   * [Drone.prism() method](#droneprism-method)
   * [Drone.prism0() method](#droneprism0-method)
   * [Drone.cylinder() method](#dronecylinder-method)
   * [Drone.cylinder0() method](#dronecylinder0-method)
   * [Drone.arc() method](#dronearc-method)
   * [Drone.door() method](#dronedoor-method)
   * [Drone.door2() method](#dronedoor2-method)
   * [Drone.sign() method](#dronesign-method)
   * [Drone Trees methods](#drone-trees-methods)
   * [Drone.garden() method](#dronegarden-method)
   * [Drone.rand() method](#dronerand-method)
   * [Copy & Paste using Drone](#copy--paste-using-drone)
   * [Drone.copy() method](#dronecopy-method)
   * [Drone.paste() method](#dronepaste-method)
   * [Chaining](#chaining)
   * [Drone Properties](#drone-properties)
   * [Extending Drone](#extending-drone)
   * [Drone.extend() static method](#droneextend-static-method)
   * [Drone Constants](#drone-constants)
   * [Drone.times() Method](#dronetimes-method)
   * [Drone.blocktype() method](#droneblocktype-method)
   * [Drone.rainbow() method](#dronerainbow-method)
   * [Drone.sphere() method](#dronesphere-method)
   * [Drone.sphere0() method](#dronesphere0-method)
   * [Drone.hemisphere() method](#dronehemisphere-method)
   * [Drone.hemisphere0() method](#dronehemisphere0-method)
   * [Drone.spiral_stairs() method](#dronespiral_stairs-method)
 * [Example Plugin #1 - A simple extension to Minecraft.](#example-plugin-1---a-simple-extension-to-minecraft)
   * [Usage:](#usage)
 * [Example Plugin #2 - Making extensions available for all players.](#example-plugin-2---making-extensions-available-for-all-players)
   * [Usage:](#usage-1)
 * [Example Plugin #3 - Limiting use of commands to operators only.](#example-plugin-3---limiting-use-of-commands-to-operators-only)
   * [Usage:](#usage-2)
 * [Example Plugin #4 - Using parameters in commands.](#example-plugin-4---using-parameters-in-commands)
   * [Usage:](#usage-3)
 * [Example Plugin #5 - Re-use - Using your own and others modules.](#example-plugin-5---re-use---using-your-own-and-others-modules)
   * [Usage:](#usage-4)
 * [Example Plugin #6 - Re-use - Using 'utils' to get Player objects.](#example-plugin-6---re-use---using-utils-to-get-player-objects)
   * [Usage:](#usage-5)
 * [Example Plugin #7 - Listening for events, Greet players when they join the game.](#example-plugin-7---listening-for-events-greet-players-when-they-join-the-game)
 * [Arrows Plugin](#arrows-plugin)
   * [Usage:](#usage-6)
 * [alias Plugin](#alias-plugin)
   * [Examples](#examples-2)
 * [Classroom Plugin](#classroom-plugin)
   * [classroom.allowScripting() function](#classroomallowscripting-function)
 * [Commando Plugin](#commando-plugin)
   * [Description](#description)
   * [Example hi-command.js](#example-hi-commandjs)
   * [Example - timeofday-command.js](#example---timeofday-commandjs)
   * [Caveats](#caveats)
 * [homes Plugin](#homes-plugin)
   * [Basic options](#basic-options)
   * [Social options](#social-options)
   * [Administration options](#administration-options)
 * [NumberGuess mini-game:](#numberguess-mini-game)
   * [Description](#description-1)
   * [Example](#example-1)
 * [SnowballFight mini-game](#snowballfight-mini-game)
   * [Description](#description-2)

## Modules in Scriptcraft

ScriptCraft has a simple module loading system. In ScriptCraft, files
and modules are in one-to-one correspondence. As an example, foo.js
loads the module circle.js in the same directory. 
*ScriptCraft now uses the same module system as Node.js - see [Node.js Modules][njsmod] for more details.*

[njsmod]: http://nodejs.org/api/modules.html

The contents of foo.js:

    var circle = require('./circle.js');
    console.log( 'The area of a circle of radius 4 is '
               + circle.area(4));

The contents of circle.js:

    var PI = Math.PI;
    
    exports.area = function (r) {
      return PI * r * r;
    };

    exports.circumference = function (r) {
      return 2 * PI * r;
    };

The module circle.js has exported the functions area() and
circumference(). To add functions and objects to the root of your
module, you can add them to the special exports object.

Variables local to the module will be private, as though the module
was wrapped in a function. In this example the variable PI is private
to circle.js.

If you want the root of your module's export to be a function (such as
a constructor) or if you want to export a complete object in one
assignment instead of building it one property at a time, assign it to
module.exports instead of exports.

## Module Loading

When the ScriptCraft Java plugin is first installed, a new
subdirectory is created in the craftbukkit/plugins directory. If your
craftbukkit directory is called 'craftbukkit' then the new
subdirectories will be ...

 * craftbukkit/plugins/scriptcraft/
 * craftbukkit/plugins/scriptcraft/plugins
 * craftbukkit/plugins/scriptcraft/modules
 * craftbukkit/plugins/scriptcraft/lib

... The `plugins`, `modules` and `lib` directories each serve a different purpose.

### The plugins directory

At server startup the ScriptCraft Java plugin is loaded and begins
automatically loading and executing all of the modules (javascript
files with the extension `.js`) it finds in the `scriptcraft/plugins`
directory. All modules in the plugins directory are automatically
loaded into the `global` namespace. What this means is that anything a
module in the `plugins` directory exports becomes a global
variable. For example, if you have a module greeting.js in the plugins
directory....

    exports.greet = function(player) {
        player.sendMessage('Hello ' + player.name);
    };

... then `greet` becomes a global function and can be used at the
in-game (or server) command prompt like so...

    /js greet(self)

... This differs from how modules (in NodeJS and commonJS
environments) normally work. If you want your module to be exported
globally, put it in the `plugins` directory. If you don't want your
module to be exported globally but only want it to be used by other
modules, then put it in the `modules` directory instead. If you've
used previous versions of ScriptCraft and have put your custom
javascript modules in the `js-plugins` directory, then put them in the
`scriptcraft/plugins` directory. To summarise, modules in this directory are ...

 * Automatically loaded and run at server startup.
 * Anything exported by modules becomes a global variable.

### The modules directory

The module directory is where you should place your modules if you
don't want to export globally. In javascript, it's considered best
practice not to have too many global variables, so if you want to
develop modules for others to use, or want to develop more complex
mods then your modules should be placed in the `modules` directory.
*Modules in the `modules` directory are not automatically loaded at
startup*, instead, they are loaded and used by other modules/plugins
using the standard `require()` function.  This is the key difference
between modules in the `plugins` directory and modules in the
`modules` directory. Modules in the `plugins` directory are
automatically loaded and exported in to the global namespace at server
startup, modules in the `modules` directory are not.

### The lib directory

Modules in the `lib` directory are for use by ScriptCraft and some
core functions for use by module and plugin developers are also
provided. The `lib` directory is for internal use by ScriptCraft.
Modules in this directory are not automatically loaded nor are they
globally exported.

### plugins sub-directories

As of December 24 2013, the `scriptcraft/plugins` directory has the following sub-directories...

 * drone - Contains the drone module and drone extensions. Drone was the first scriptcraft module.
 * mini-games - Contains mini-games 
 * arrows - The arrows module - Changes the behaviour of Arrows: Explosive, Fireworks, Teleportation etc.
 * signs - The signs module (includes example signs) - create interactive signs.
 * chat - The chat plugin/module 
 * alias - The alias plugin/module - for creating custom aliases for commonly used commands.
 * home - The home module - for setting homes and visiting other homes.

## Global variables

There are a couple of special javascript variables available in ScriptCraft...
 
### __plugin variable
The ScriptCraft JavaPlugin object.

### server variable
The Minecraft Server object

### self variable
The current player. (Note - this value should not be used in
multi-threaded scripts or event-handling code - it's not
thread-safe). This variable is only safe to use at the in-game prompt
and should *never* be used in modules. For example you can use it here...

    /js console.log(self.name)

... but not in any javascript module you create yourself or in any
event handling code. `self` is a temporary short-lived variable which
only exists in the context of the in-game or server command prompts.

### config variable
ScriptCraft configuration - this object is loaded and saved at startup/shutdown.

### events variable
The events object is used to add new event handlers to Minecraft.

## Module variables
The following variables are available only within the context of Modules. (not available at in-game prompt).

### __filename variable
The current file - this variable is only relevant from within the context of a Javascript module.

### __dirname variable
The current directory - this variable is only relevant from within the context of a Javascript module.

## Global functions

ScripCraft provides some global functions which can be used by all plugins/modules...

### echo function

The `echo()` function displays a message on the in-game screen. The
message is displayed to the `self` player (this is usually the player
who issued the `/js` or `/jsp` command).

#### Example

    /js echo('Hello World')

For programmers familiar with Javascript web programming, an `alert`
function is also provided.  `alert` works exactly the same as `echo`
e.g. `alert('Hello World')`.

#### Notes

The `echo` and `alert` functions are provided as convenience functions
for beginning programmers. The use of these 2 functions is not
recommended in event-handling code or multi-threaded code. In such
cases, if you want to send a message to a given player then use the
Bukkit API's [Player.sendMessage()][plsm] function instead.

[plsm]: http://jd.bukkit.org/dev/apidocs/org/bukkit/command/CommandSender.html#sendMessage(java.lang.String)

### require() function

ScriptCraft's `require()` function is used to load modules. The
`require()` function takes a module name as a parameter and will try
to load the named module.

#### Parameters

 * modulename - The name of the module to be loaded. Can be one of the following...

   - A relative file path (with or without `.js` suffix)
   - An absolute file path (with or without `.js` suffix)
   - A relative directory path (uses node.js rules for directories)
   - An absolute directory path (uses node.js rules for directories)
   - A name of the form `'events'` - in which case the `lib` directory and `modules` directories are searched for the module.

#### Return

require() will return the loaded module's exports.

### load() function 

#### No longer recommended for use by Plugin/Module developers (deprecated)

load() should only be used to load .json data.

#### Parameters

 * filename - The name of the file to load.
 * warnOnFileNotFound (optional - default: false) - warn if the file was not found.

#### Returns

load() will return the result of the last statement evaluated in the file.

#### Example

    load("myFile.js"); // loads a javascript file and evaluates it.

    var myData = load("myData.json"); // loads a javascript file and evaluates it - eval'd contents are returned.

##### myData.json contents...

    { players: {
        walterh: {
          h: ["jsp home {1}"],
          sunny:["time set 0",
                 "weather clear"]
        }
      }
    }

### save() function

The save() function saves an in-memory javascript object to a
specified file. Under the hood, save() uses JSON (specifically
json2.js) to save the object. Again, there will usually be no need to
call this function directly as all javascript plugins' state are saved
automatically if they are declared using the `plugin()` function.  Any
in-memory object saved using the `save()` function can later be
restored using the `load()` function.

#### Parameters

 * objectToSave : The object you want to save.
 * filename : The name of the file you want to save it to.

#### Example

    var myObject = { name: 'John Doe',
                     aliases: ['John Ray', 'John Mee'],
                     date_of_birth: '1982/01/31' };
    save(myObject, 'johndoe.json');

##### johndoe.json contents...

    { "name": "John Doe", 
      "aliases": ["John Ray", "John Mee"], 
      "date_of_birth": "1982/01/31" 
    };

### plugin() function

The `plugin()` function should be used to declare a javascript module
whose state you want to have managed by ScriptCraft - that is - a
Module whose state will be loaded at start up and saved at shut down.
A plugin is just a regular javascript object whose state is managed by
ScriptCraft.  The only member of the plugin which whose persistence is
managed by Scriptcraft is `store` - this special member will be
automatically saved at shutdown and loaded at startup by
ScriptCraft. This makes it easier to write plugins which need to
persist data.

#### Parameters
 
 * pluginName (String) : The name of the plugin - this becomes a global variable.
 * pluginDefinition (Object) : The various functions and members of the plugin object.
 * isPersistent (boolean - optional) : Specifies whether or not the
   plugin/object state should be loaded and saved by ScriptCraft.

#### Example

See chat/color.js for an example of a simple plugin - one which lets
players choose a default chat color. See also [Anatomy of a
ScriptCraft Plugin][anatomy].
 
[anatomy]: ./Anatomy-of-a-Plugin.md

### command() function

The `command()` function is used to expose javascript functions for
use by non-operators (regular players). Only operators should be
allowed use raw javascript using the `/js ` command because it is too
powerful for use by regular players and can be easily abused. However,
the `/jsp ` command lets you (the operator / server administrator /
plugin author) safely expose javascript functions for use by players.

#### Parameters
 
 * commandName : The name to give your command - the command will 
   be invoked like this by players `/jsp commandName`
 * commandFunction: The javascript function which will be invoked when
   the command is invoked by a player. The callback function in turn
   takes 2 parameters...

   * params : An Array of type String - the list of parameters 
     passed to the command.
   * sender : The [CommandSender][bukcs] object that invoked the
     command (this is usually a Player object but can be a Block
     ([BlockCommandSender][bukbcs]).

 * options (Array - optional) : An array of command options/parameters
   which the player can supply (It's useful to supply an array so that
   Tab-Completion works for the `/jsp ` commands.
 * intercepts (boolean - optional) : Indicates whether this command
   can intercept Tab-Completion of the `/jsp ` command - advanced
   usage - see alias/alias.js for example.

#### Example

See chat/colors.js or alias/alias.js or homes/homes.js for examples of
how to use the `command()` function.

### setTimeout() function

This function mimics the setTimeout() function used in browser-based
javascript.  However, the function will only accept a function
reference, not a string of javascript code.  Where setTimeout() in the
browser returns a numeric value which can be subsequently passed to
clearTimeout(), This implementation returns a [BukkitTask][btdoc]
object which can be subsequently passed to ScriptCraft's own
clearTimeout() implementation.

If Node.js supports setTimeout() then it's probably good for ScriptCraft to support it too.

[btdoc]: http://jd.bukkit.org/beta/apidocs/org/bukkit/scheduler/BukkitTask.html

#### Example

    //
    // start a storm in 5 seconds
    //    
    setTimeout( function() {
        var world = server.worlds.get(0);
        world.setStorm(true);
    }, 5000);

### clearTimeout() function

A scriptcraft implementation of clearTimeout().

### setInterval() function

This function mimics the setInterval() function used in browser-based
javascript.  However, the function will only accept a function
reference, not a string of javascript code.  Where setInterval() in
the browser returns a numeric value which can be subsequently passed
to clearInterval(), This implementation returns a [BukkitTask][btdoc]
object which can be subsequently passed to ScriptCraft's own
clearInterval() implementation.

If Node.js supports setInterval() then it's probably good for
ScriptCraft to support it too.

[btdoc]: http://jd.bukkit.org/beta/apidocs/org/bukkit/scheduler/BukkitTask.html

### clearInterval() function

A scriptcraft implementation of clearInterval().

### refresh() function

The refresh() function can be used to only reload the ScriptCraft
plugin (it's like the `reload` command except it only reloads
ScriptCraft). The refresh() function will ...

1. Disable the ScriptCraft plugin.
2. Unload all event listeners associated with the ScriptCraft plugin.
3. Enable the ScriptCraft plugin.

... refresh() can be used during development to reload only scriptcraft javascript files.
See [issue #69][issue69] for more information.

[issue69]: https://github.com/walterhiggins/ScriptCraft/issues/69

### addUnloadHandler() function

The addUnloadHandler() function takes a callback function as a
parameter. The callback will be called when the ScriptCraft plugin is
unloaded (usually as a result of a a `reload` command or server
shutdown).

This function provides a way for ScriptCraft modules to do any
required cleanup/housekeeping just prior to the ScriptCraft Plugin
unloading.

## require - Node.js-style module loading in ScriptCraft

Node.js is a server-side javascript environment with an excellent
module loading system based on CommonJS. Modules in Node.js are really
simple. Each module is in its own javascript file and all variables
and functions within the file are private to that file/module only.
There is a very concise explanation of CommonJS modules at...

[http://wiki.commonjs.org/wiki/Modules/1.1.1.][cjsmodules]

Node.js also has good documentation on [Modules][njsmod].

If you want to export a variable or function you use the module.export
property.

For example imagine you have 3 files program.js, inc.js  and math.js ...

### math.js

    exports.add = function(a,b){
        return a + b;
    }

### inc.js

    var math = require('./math');
    exports.increment = function(n){
        return math.add(n, 1);
    }

### program.js

    var inc = require('./inc').increment;
    var a = 7;
    a = inc(a);
    print(a);

You can see from the above sample code that programs can use modules
and modules themeselves can use other modules. Modules have full
control over what functions and properties they want to provide to
others.

### Important

Although ScriptCraft now supports Node.js style modules, it does not
support node modules. Node.js and Rhino are two very different
Javascript environments. ScriptCraft uses Rhino Javascript, not
Node.js. Standard Node.js modules such as `'fs'` are not available in ScriptCraft.

Modules can be loaded using relative or absolute paths. Per the CommonJS
module specification, the '.js' suffix is optional.

[cjsmodules]: http://wiki.commonjs.org/wiki/Modules/1.1.1.

### module name resolution

When resolving module names to file paths, ScriptCraft uses the following rules...

 1. if the module does not begin with './' or '/' then ...

    1.1 Look in the 'scriptcraft/lib' directory. If it's not there then...
    1.2 Look in the 'scriptcraft/modules' directory. If it's not there then 
        Throw an Error.

 2. If the module begins with './' or '/' then ...
    
    2.1 if the module begins with './' then it's treated as a file path. File paths are 
        always relative to the module from which the require() call is being made.

    2.2 If the module begins with '/' then it's treated as an absolute path.

    If the module does not have a '.js' suffix, and a file with the same name and a .js sufix exists, 
    then the file will be loaded.

 3. If the module name resolves to a directory then...
    
    3.1 look for a package.json file in the directory and load the `main` property e.g.
    
    // package.json located in './some-library/'
    {
      "main": './some-lib.js',
      "name": 'some-library'
    }
    
    3.2 if no package.json file exists then look for an index.js file in the directory

## events Module

The Events module provides a thin wrapper around Bukkit's
Event-handling API.  Bukkit's Events API makes use of Java Annotations
which are not available in Javascript, so this module provides a
simple way to listen to minecraft events in javascript.

### events.on() static method

This method is used to register event listeners. 

#### Parameters


 * eventName - A string or java class. If a string is supplied it must
   be part of the Bukkit event class name.  See [Bukkit API][buk] for
   details of the many bukkit event types. When a string is supplied
   there is no need to provide the full class name - you should omit
   the 'org.bukkit.event' prefix. e.g. if the string
   "block.BlockBreakEvent" is supplied then it's converted to the
   org.bukkit.event.block.BlockBreakEvent class .
 
   If a java class is provided (say in the case where you've defined
   your own custom event) then provide the full class name (without
   enclosing quotes).

 * callback - A function which will be called whenever the event
   fires. The callback should take 2 parameters, listener (the Bukkit
   registered listener for this callback) and event (the event fired).

 * priority (optional - default: "HIGHEST") - The priority the
   listener/callback takes over other listeners to the same
   event. Possible values are "HIGH", "HIGHEST", "LOW", "LOWEST",
   "NORMAL", "MONITOR". For an explanation of what the different
   priorities mean refer to bukkit's [Event API Reference][buk2].

#### Returns

An org.bukkit.plugin.RegisteredListener object which can be used to
unregister the listener. This same object is passed to the callback
function each time the event is fired.

#### Example:

The following code will print a message on screen every time a block is broken in the game

    events.on('block.BlockBreakEvent', function(listener, evt){ 
        evt.player.sendMessage( evt.player.name + ' broke a block!');
    });

To handle an event only once and unregister from further events...
    
    events.on('block.BlockBreakEvent', function(listener, evt){ 
        evt.player.sendMessage( evt.player.name + ' broke a block!');
        evt.handlers.unregister(listener);
    });

To unregister a listener *outside* of the listener function...

    var myBlockBreakListener = events.on('block.BlockBreakEvent',function(l,e){ ... });
    ...
    var handlers = org.bukkit.event.block.BlockBreakEvent.getHandlerList();
    handlers.unregister(myBlockBreakListener);

To listen for events using a full class name as the `eventName` parameter...

    events.on(org.bukkit.event.block.BlockBreakEvent, function(listener, evt){ 
        evt.player.sendMessage( evt.player.name + ' broke a block!');
    });

[buk2]: http://wiki.bukkit.org/Event_API_Reference
[buk]: http://jd.bukkit.org/dev/apidocs/index.html?org/bukkit/event/Event.html

## console global variable

ScriptCraft provides a `console` global variable with the followng methods...

 * log()  
 * info() 
 * warn()
 * error()

The ScriptCraft console methods work like the [Web API implementation][webcons].

### Example 

    console.log('Hello %s', 'world');

Basic variable substitution is supported (ScriptCraft's implementation
of console uses the Bukkit Plugin [Logger][lgr] under the hood and
uses [java.lang.String.format()][strfmt] for variable
substitution. All output will be sent to the server console (not
in-game).

### Using string substitutions

ScriptCraft uses Java's [String.format()][strfmt] so any string substitution identifiers supported by 
`java.lang.String.format()` are supported (e.g. %s , %d etc).

    for (var i=0; i<5; i++) {
      console.log("Hello, %s. You've called me %d times.", "Bob", i+1);
    }

[lgr]: http://jd.bukkit.org/beta/apidocs/org/bukkit/plugin/PluginLogger.html
[strfmt]: http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#format(java.lang.String, java.lang.Object...)
[webcons]: https://developer.mozilla.org/en-US/docs/Web/API/console

## Blocks Module

You hate having to lookup [Data Values][dv] when you use ScriptCraft's
Drone() functions. So do I.  So I created this blocks object which is
a helper object for use in construction.

### Examples

    box( blocks.oak ); // creates a single oak wood block
    box( blocks.sand, 3, 2, 1 ); // creates a block of sand 3 wide x 2 high x 1 long
    box( blocks.wool.green, 2 ); // creates a block of green wool 2 blocks wide

Color aliased properties that were a direct descendant of the blocks
object are no longer used to avoid confusion with carpet and stained
clay blocks. In addition, there's a convenience array `blocks.rainbow`
which is an array of the 7 colors of the rainbow (or closest
approximations).

The blocks module is globally exported by the Drone module.

## Fireworks Module

The fireworks module makes it easy to create fireworks using
ScriptCraft.  The module has a single function `firework` which takes
a `org.bukkit.Location` as its 1 and only parameter.

### Examples

The module also extends the `Drone` object adding a `firework` method
so that fireworks can be created as a part of a Drone chain. For
Example....

    /js firework()

... creates a single firework, while ....

    /js firework().fwd(3).times(5) 

... creates 5 fireworks in a row. Fireworks have also been added as a
possible option for the `arrow` module. To have a firework launch
where an arrow strikes...

    /js arrows.firework()

To call the fireworks.firework() function directly, you must provide a
location. For example...

    /js var fireworks = require('fireworks');
    /js fireworks.firework(self.location);

![firework example](img/firework.png)

## Http Module

For handling http requests. Not to be confused with the more robust
and functional 'http' module bundled with Node.js.

### http.request() function

The http.request() function will fetch a web address asynchronously (on a
separate thread)and pass the URL's response to a callback function
which will be executed synchronously (on the main thread).  In this
way, http.request() can be used to fetch web content without blocking the
main thread of execution.

#### Parameters

 * request: The request details either a plain URL e.g. "http://scriptcraft.js/sample.json" or an object with the following properties...

   - url: The URL of the request.
   - method: Should be one of the standard HTTP methods, GET, POST, PUT, DELETE (defaults to GET).
   - params: A Javascript object with name-value pairs. This is for supplying parameters to the server.

 * callback: The function to be called when the Web request has completed. This function takes the following parameters...
   - responseCode: The numeric response code from the server. If the server did not respond with 200 OK then the response parameter will be undefined.
   - response: A string (if the response is of type text) or object containing the HTTP response body.

#### Example

The following example illustrates how to use http.request to make a request to a JSON web service and evaluate its response...

    var jsResponse;
    var http = require('./http/request');
    http.request("http://scriptcraftjs.org/sample.json",function(responseCode, responseBody){
        jsResponse = eval("(" + responseBody +  ")");
    });

... The following example illustrates a more complex use-case POSTing parameters to a CGI process on a server...

    var http = require('./http/request');
    http.request({ url: "http://pixenate.com/pixenate/pxn8.pl",
                   method: "POST",
                   params: {script: "[]"}
                 }, function( responseCode, responseBody){
          var jsObj = eval("(" + responseBody + ")");
      });

## Signs Module

The Signs Module can be used by plugin authors to create interactive
signs - that is - signs which display a list of choices which can be
changed by interacting (right-clicking) with the sign.

### signs.menu() function

This function is used to construct a new interactive menu on top of an
existing sign in the game world.

#### Parameters

 * Label : A string which will be displayed in the topmost line of the
   sign. This label is not interactive.  
 * options : An array of strings which can be selected on the sign by 
   right-clicking/interacting.
 * callback : A function which will be called whenever a player
   interacts (changes selection) on a sign. This callback in turn
   takes as its parameter, an object with the following properties...

   * player : The player who interacted with the sign.
   * sign : The [org.bukkit.block.Sign][buksign] which the player interacted with.
   * text : The text for the currently selected option on the sign.
   * number : The index of the currently selected option on the sign.
 
 * selectedIndex : optional: A number (starting at 0) indicating which
   of the options should be selected by default. 0 is the default.

#### Returns
This function does not itself do much. It does however return a
function which when invoked with a given
[org.bukkit.block.Sign][buksign] object, will convert that sign into
an interactive sign.

#### Example: Create a sign which changes the time of day.

##### plugins/signs/time-of-day.js
    
    var utils = require('utils'),
        signs = require('signs');

    var onTimeChoice = function(event){
        var selectedIndex = event.number;
        // convert to Minecraft time 0 = Dawn, 6000 = midday, 12000 = dusk, 18000 = midnight
        var time = selectedIndex * 6000; 
        event.player.location.world.setTime(time);
    };

    // signs.menu returns a function which can be called for one or more signs in the game.
    var convertToTimeMenu = signs.menu('Time of Day',
        ['Dawn', 'Midday', 'Dusk', 'Midnight'],
        onTimeChoice);
        
    exports.time_sign = function( player ){

        var sign = signs.getTargetedBy(player);
        if (!sign){
            throw new Error('You must look at a sign');
        } 
        convertToTimeMenu(sign);
    };

To use the above function at the in-game prompt, look at an existing
sign and type...

    /js time_sign(self);

... and the sign you're looking at will become an interactive sign
which changes the time each time you interact (right-click) with it.

### signs.getTargetedBy() function

This function takes a [org.bukkit.entity.LivingEntity][bukle] as a
parameter and returns a [org.bukkit.block.Sign][buksign] object which
the entity has targeted. It is a utility function for use by plugin authors.

#### Example

     var signs = require('signs'),
         utils = require('utils');
     var player = utils.player('tom1234');
     var sign = signs.getTargetedBy( player );
     if (!sign){ 
        player.sendMessage('Not looking at a sign');
     }

[buksign]: http://jd.bukkit.org/dev/apidocs/org/bukkit/block/Sign.html

String class extensions
-----------------------
The following chat-formatting methods are added to the javascript String class..

    * aqua()
    * black()
    * blue()
    * bold()
    * brightgreen()
    * darkaqua()
    * darkblue()
    * darkgray()
    * darkgreen()
    * purple()
    * darkpurple()
    * darkred()
    * gold()
    * gray()
    * green()
    * italic()
    * lightpurple()
    * indigo()
    * green()
    * red()
    * pink()
    * yellow()
    * white()
    * strike()
    * random()
    * magic()
    * underline()
    * reset()

Example
-------

    /js var boldGoldText = "Hello World".bold().gold();
    /js self.sendMessage(boldGoldText);

<p style="color:gold;font-weight:bold">Hello World</p>    

## Utilities Module

The `utils` module is a storehouse for various useful utility
functions which can be used by plugin and module authors. It contains
miscellaneous utility functions and classes to help with programming.

### utils.player() function

The utils.player() function will return a [bukkit Player][bkpl] object
with the given name. This function takes a single parameter
`playerName` which can be either a String or a [Player][bkpl] object -
if it's a Player object, then the same object is returned. If it's a
String, then it tries to find the player with that name.

#### Parameters

 * playerName : A String or Player object. If no parameter is provided
   then player() will try to return the `self` variable . It is 
   strongly recommended to provide a parameter.

#### Example

    var utils = require('utils');
    var name = 'walterh';
    var player = utils.player(name);
    if (player) {
        player.sendMessage('Got ' + name);
    }else{
        console.log('No player named ' + name);
    }

[bkpl]: http://jd.bukkit.org/dev/apidocs/org/bukkit/entity/Player.html
[bkloc]: http://jd.bukkit.org/dev/apidocs/org/bukkit/Location.html

### utils.locationToJSON() function

utils.locationToJSON() returns a [org.bukkit.Location][bkloc] object in JSON form...

    { world: 'world5',
      x: 56.9324,
      y: 103.9954,
      z: 43.1323,
      yaw: 0.0,
      pitch: 0.0
    }

This can be useful if you write a plugin that needs to store location data since bukkit's Location object is a Java object which cannot be serialized to JSON by default.

#### Parameters
 
 * location: An object of type [org.bukkit.Location][bkloc]

#### Returns

A JSON object in the above form.
 
### utils.locationToString() function

The utils.locationToString() function returns a
[org.bukkit.Location][bkloc] object in string form...

    '{"world":"world5",x:56.9324,y:103.9954,z:43.1323,yaw:0.0,pitch:0.0}'

... which can be useful if you write a plugin which uses Locations as
keys in a lookup table.

#### Example
    
    var utils = require('utils');
    ...
    var key = utils.locationToString(player.location);
    lookupTable[key] = player.name;

### utils.locationFromJSON() function

This function reconstructs an [org.bukkit.Location][bkloc] object from
a JSON representation. This is the counterpart to the
`locationToJSON()` function. It takes a JSON object of the form
returned by locationToJSON() and reconstructs and returns a bukkit
Location object.

### utils.getPlayerPos() function

This function returns the player's [Location][bkloc] (x, y, z, pitch
and yaw) for a named player.  If the "player" is in fact a
[org.bukkit.command.BlockCommandSender][bkbcs] then the attached
Block's location is returned.

#### Parameters

 * player : A [org.bukkit.command.CommandSender][bkbcs] (Player or BlockCommandSender) or player name (String).

#### Returns

An [org.bukkit.Location][bkloc] object.

[bkbcs]: http://jd.bukkit.org/dev/apidocs/org/bukkit/command/BlockCommandSender.html
[bksndr]: http://jd.bukkit.org/dev/apidocs/index.html?org/bukkit/command/CommandSender.html
### utils.getMousePos() function

This function returns a [org.bukkit.Location][bkloc] object (the
x,y,z) of the current block being targeted by the named player. This
is the location of the block the player is looking at (targeting).

#### Parameters

 * player : The player whose targeted location you wish to get.

#### Example

The following code will strike lightning at the location the player is looking at...

    var utils = require('utils');
    var playerName = 'walterh';
    var targetPos = utils.getMousePos(playerName);
    if (targetPos){
       targetPos.world.strikeLightning(targetPos);
    }

### utils.foreach() function

The utils.foreach() function is a utility function for iterating over
an array of objects (or a java.util.Collection of objects) and processing each object in turn. Where
utils.foreach() differs from other similar functions found in
javascript libraries, is that utils.foreach can process the array
immediately or can process it *nicely* by processing one item at a
time then delaying processing of the next item for a given number of
server ticks (there are 20 ticks per second on the minecraft main
thread).  This method relies on Bukkit's [org.bukkit.scheduler][sched]
package for scheduling processing of arrays.

[sched]: http://jd.bukkit.org/beta/apidocs/org/bukkit/scheduler/package-summary.html

#### Parameters

 * array : The array to be processed - It can be a javascript array, a java array or java.util.Collection
 * callback : The function to be called to process each item in the
   array. The callback function should have the following signature
   `callback(item, index, object, array)`. That is the callback will
   be called with the following parameters....

   - item : The item in the array
   - index : The index at which the item can be found in the array.
   - object : Additional (optional) information passed into the foreach method.
   - array : The entire array.

 * object (optional) : An object which may be used by the callback.
 * delay (optional, numeric) : If a delay is specified (in ticks - 20
   ticks = 1 second), then the processing will be scheduled so that
   each item will be processed in turn with a delay between the completion of each
   item and the start of the next. This is recommended for big builds (say 200 x 200 x 200
   blocks) or any CPU-intensive process.
 * onDone (optional, function) : A function to be executed when all processing 
   is complete. This parameter is only used when the processing is delayed. (It's optional even if a 
   delay parameter is supplied).

If called with a delay parameter then foreach() will return
immediately after processing just the first item in the array (all
subsequent items are processed later). If your code relies on the
completion of the array processing, then provide an `onDone` parameter
and put the code there.

#### Example

The following example illustrates how to use foreach for immediate processing of an array...

    var utils = require('utils');
    var players = ['moe', 'larry', 'curly'];
    utils.foreach (players, function(item){ 
        server.getPlayer(item).sendMessage('Hi ' + item);
    });

... The `utils.foreach()` function can work with Arrays or any Java-style collection. This is important
because many objects in the Bukkit API use Java-style collections...

    utils.foreach( server.onlinePlayers, function(player){
         player.chat('Hello!');
    }); 

... the above code sends a 'Hello!' to every online player.

The following example is a more complex use case - The need to build an enormous structure
without hogging CPU usage...

    // build a structure 200 wide x 200 tall x 200 long
    // (That's 8 Million Blocks - enough to tax any machine!)
    var utils = require('utils');

    var a = []; 
    a.length = 200; 
    var drone = new Drone();
    var processItem = function(item, index, object, array){
        // build a box 200 wide by 200 long then move up
        drone.box(blocks.wood, 200, 1, 200).up();
    };
    // by the time the job's done 'self' might be someone else 
    // assume this code is within a function/closure
    var player = self;
    var onDone = function(){ 
        player.sendMessage('Job Done!');
    };
    utils.foreach (a, processItem, null, 10, onDone);
    
### utils.nicely() function

The utils.nicely() function is for performing processing using the
[org.bukkit.scheduler][sched] package/API. utils.nicely() lets you
process with a specified delay between the completion of each `next()`
function and the start of the next `next()` function.
`utils.nicely()` is a recursive function - that is - it calls itself
(schedules itself actually) repeatedly until `hasNext` returns false.

#### Parameters

 * next : A function which will be called if processing is to be done. 
 * hasNext : A function which is called to determine if the `next`
   callback should be invoked. This should return a boolean value -
   true if the `next` function should be called (processing is not
   complete), false otherwise.
 * onDone : A function which is to be called when all processing is complete (hasNext returned false).
 * delay : The delay (in server ticks - 20 per second) between each call.

#### Example

See the source code to utils.foreach for an example of how utils.nicely is used.

### utils.at() function

The utils.at() function will perform a given task at a given time every 
(minecraft) day.

#### Parameters

 * time24hr : The time in 24hr form - e.g. 9:30 in the morning is '09:30' while
   9:30 pm is '21:30', midnight is '00:00' and midday is '12:00'
 * callback : A javascript function which will be invoked at the given time.
 * worlds : (optional) An array of worlds. Each world has its own clock. If no array of worlds is specified, all the server's worlds are used.

#### Example

To warn players when night is approaching...

    var utils = require('utils');

    utils.at( '19:00', function() {

        utils.foreach( server.onlinePlayers, function(player){
            player.chat('The night is dark and full of terrors!');            
        });

    });
  
### utils.find() function

The utils.find() function will return a list of all files starting at
a given directory and recursiving trawling all sub-directories.

#### Parameters

 * dir : The starting path. Must be a string.
 * filter : (optional) A [FilenameFilter][fnfltr] object to return only files matching a given pattern.

[fnfltr]: http://docs.oracle.com/javase/6/docs/api/java/io/FilenameFilter.html

#### Example

    var utils = require('utils');
    var jsFiles = utils.find('./', function(dir,name){
        return name.match(/\.js$/);
    });  

## Drone Plugin

The Drone is a convenience class for building. It can be used for...

 1. Building
 2. Copying and Pasting

It uses a fluent interface which means all of the Drone's methods return `this` and can 
be chained together like so...

    var theDrone = new Drone();
    theDrone.up().left().box(blocks.oak).down().fwd(3).cylinder0(blocks.lava,8); 

### TLDNR; (Just read this if you're impatient)

At the in-game command prompt type...
     
    /js box( blocks.oak )  
    
... creates a single wooden block at the cross-hairs or player location
    
    /js box( blocks.oak ).right(2).box( blocks.wool.black, 4, 9, 1)
    
... creates a single wooden block and a 2001 black obelisk that is 4
wide x 9 tall x 1 long in size.  If you want to see what else
ScriptCraft's Drone can do, read on...

### Constructing a Drone Object

Drones can be created in any of the following ways...
    
 1. Calling any one of the methods listed below will return a Drone object. For example...
         
        var d = box( blocks.oak )

   ... creates a 1x1x1 wooden block at the cross-hairs or player's location and returns a Drone
   object. This might look odd (if you're familiar with Java's Object-dot-method syntax) but all 
   of the Drone class's methods are also global functions that return new Drone objects. 
   This is short-hand for creating drones and is useful for playing around with Drones at the in-game 
   command prompt. It's shorter than typing ...
    
        var d = new Drone().box( blocks.oak ) 
        
   ... All of the Drone's methods return `this` so you can chain operations together like this...
        
        var d = box( blocks.oak )
                  .up()
                  .box( blocks.oak ,3,1,3)
                  .down()
                  .fwd(2)
                  .box( blocks.oak )
                  .turn()
                  .fwd(2)
                  .box( blocks.oak )
                  .turn()
                  .fwd(2)
                  .box( blocks.oak );
    
 2. Using the following form...

        d = new Drone()
    
    ...will create a new Drone. If the cross-hairs are pointing at a
    block at the time then, that block's location becomes the drone's
    starting point.  If the cross-hairs are _not_ pointing at a block,
    then the drone's starting location will be 2 blocks directly in
    front of the player.  TIP: Building always happens right and front
    of the drone's position...
    
    Plan View:

        ^
        |
        |
        D---->
      
    For convenience you can use a _corner stone_ to begin building.
    The corner stone should be located just above ground level.  If
    the cross-hair is point at or into ground level when you create a
    new Drone(), then building begins at that point. You can get
    around this by pointing at a 'corner stone' just above ground
    level or alternatively use the following statement...
    
        d = new Drone().up();
          
    ... which will move the drone up one block as soon as it's created.

    ![corner stone](img/cornerstone1.png)

 3. Or by using the following form...
    
        d = new Drone(x,y,z,direction,world);

    This will create a new Drone at the location you specified using
    x, y, z In minecraft, the X axis runs west to east and the Z axis runs
    north to south.  The direction parameter says what direction you want
    the drone to face: 0 = east, 1 = south, 2 = west, 3 = north.  If the
    direction parameter is omitted, the player's direction is used
    instead.

    Both the `direction` and `world` parameters are optional.

 4. Create a new Drone based on a Bukkit Location object...

        d = new Drone(location);

    This is useful when you want to create a drone at a given
    `org.bukkit.Location` . The `Location` class is used throughout
    the bukkit API. For example, if you want to create a drone when a
    block is broken at the block's location you would do so like
    this...

        events.on('block.BlockBreakEvent',function(listener,event){
            var location = event.block.location;
            var drone = new Drone(location);
            // do more stuff with the drone here...
        });

#### Parameters

 * location (optional) : *NB* If an `org.bukkit.Location` object is provided as a parameter, then it should be the only parameter.
 * x (optional) : The x coordinate of the Drone
 * y (optional) : The y coordinate of the Drone
 * z (optional) : The z coordinate of the Drone
 * direction (optional) : The direction in which the Drone is
   facing. Possible values are 0 (east), 1 (south), 2 (west) or 3 (north)
 * world (optional) : The world in which the drone is created.
  
### Drone.box() method

the box() method is a convenience method for building things. (For the more performance-oriented method - see cuboid)

#### parameters

 * b - the block id - e.g. 6 for an oak sapling or '6:2' for a birch sapling. 
   Alternatively you can use any one of the `blocks` values e.g. `blocks.sapling.birch`
 * w (optional - default 1) - the width of the structure 
 * h (optional - default 1) - the height of the structure 
 * d (optional - default 1) - the depth of the structure - NB this is
   not how deep underground the structure lies - this is how far
   away (depth of field) from the drone the structure will extend.

#### Example

To create a black structure 4 blocks wide, 9 blocks tall and 1 block long...
    
    box(blocks.wool.black, 4, 9, 1);

... or the following code does the same but creates a variable that can be used for further methods...

    var drone = new Drone();
    drone.box(blocks.wool.black, 4, 9, 1);

![box example 1](img/boxex1.png)
    
### Drone.box0() method

Another convenience method - this one creates 4 walls with no floor or ceiling.

#### Parameters

 * block - the block id - e.g. 6 for an oak sapling or '6:2' for a birch sapling. 
   Alternatively you can use any one of the `blocks` values e.g. `blocks.sapling.birch`
 * width (optional - default 1) - the width of the structure 
 * height (optional - default 1) - the height of the structure 
 * length (optional - default 1) - the length of the structure - how far
   away (depth of field) from the drone the structure will extend.

#### Example

To create a stone building with the insided hollowed out 7 wide by 3 tall by 6 long...

    box0( blocks.stone, 7, 3, 6);

![example box0](img/box0ex1.png)
   
### Drone.boxa() method

Construct a cuboid using an array of blocks. As the drone moves first along the width axis,
then the height (y axis) then the length, each block is picked from the array and placed.

#### Parameters

 * blocks - An array of blocks - each block in the array will be placed in turn.
 * width
 * height
 * length

#### Example

Construct a rainbow-colored road 100 blocks long...

    var rainbowColors = [blocks.wool.red, blocks.wool.orange, blocks.wool.yellow, blocks.wool.lime,
                         blocks.wool.lightblue, blocks.wool.blue, blocks.wool.purple];
    
    boxa(rainbowColors,7,1,30);

![boxa example](img/boxaex1.png)

### Drone Movement

Drones can move freely in minecraft's 3-D world. You control the
Drone's movement using any of the following methods..

 * up()
 * down()
 * left()
 * right()
 * fwd()
 * back()
 * turn()

... Each of these methods takes a single optional parameter
`numBlocks` - the number of blocks to move in the given direction. If
no parameter is given, the default is 1.

to change direction use the `turn()` method which also takes a single
optional parameter (numTurns) - the number of 90 degree turns to make.
Turns are always clock-wise. If the drone is facing north, then
drone.turn() will make the turn face east. If the drone is facing east
then drone.turn(2) will make the drone turn twice so that it is facing
west.

### Drone Positional Info

 * getLocation() - Returns a Bukkit Location object for the drone

### Drone Markers

Markers are useful when your Drone has to do a lot of work. You can
set a check-point and return to the check-point using the move()
method.  If your drone is about to undertake a lot of work -
e.g. building a road, skyscraper or forest you should set a
check-point before doing so if you want your drone to return to its
current location.  

A 'start' checkpoint is automatically created when the Drone is first created.

Markers are created and returned to using the followng two methods...

 * chkpt - Saves the drone's current location so it can be returned to later.
 * move - moves the drone to a saved location. Alternatively you can provide an 
   org.bukkit.Location object or x,y,z and direction parameters.

#### Parameters

 * name - the name of the checkpoint to save or return to.

#### Example

    drone.chkpt('town-square');
    //
    // the drone can now go off on a long excursion
    //
    for (i = 0; i< 100; i++){ 
        drone.fwd(12).box(6); 
    }
    //
    // return to the point before the excursion
    //
    drone.move('town-square');

### Drone.prism() method

Creates a prism. This is useful for roofs on houses.

#### Parameters

 * block - the block id - e.g. 6 for an oak sapling or '6:2' for a birch sapling. 
   Alternatively you can use any one of the `blocks` values e.g. `blocks.sapling.birch`
 * width - the width of the prism
 * length - the length of the prism (will be 2 time its height)

#### Example

    prism(blocks.oak,3,12);

![prism example](img/prismex1.png)

### Drone.prism0() method

A variation on `prism` which hollows out the inside of the prism. It uses the same parameters as `prism`.

### Drone.cylinder() method

A convenience method for building cylinders. Building begins radius blocks to the right and forward.

#### Parameters

 * block - the block id - e.g. 6 for an oak sapling or '6:2' for a birch sapling. 
   Alternatively you can use any one of the `blocks` values e.g. `blocks.sapling.birch`
 * radius 
 * height

#### Example

To create a cylinder of Iron 7 blocks in radius and 1 block high...

    cylinder(blocks.iron, 7 , 1);

![cylinder example](img/cylinderex1.png)

### Drone.cylinder0() method

A version of cylinder that hollows out the middle.

#### Example

To create a hollow cylinder of Iron 7 blocks in radius and 1 block high...

    cylinder0(blocks.iron, 7, 1);

![cylinder0 example](img/cylinder0ex1.png)

### Drone.arc() method

The arc() method can be used to create 1 or more 90 degree arcs in the horizontal or vertical planes.
This method is called by cylinder() and cylinder0() and the sphere() and sphere0() methods.

#### Parameters

arc() takes a single parameter - an object with the following named properties...

 * radius - The radius of the arc.
 * blockType - The type of block to use - this is the block Id only (no meta). See [Data Values][dv].
 * meta - The metadata value. See [Data Values][dv].
 * orientation (default: 'horizontal') - the orientation of the arc - can be 'vertical' or 'horizontal'.
 * stack (default: 1) - the height or length of the arc (depending on
   the orientation - if orientation is horizontal then this parameter
   refers to the height, if vertical then it refers to the length).
 * strokeWidth (default: 1) - the width of the stroke (how many
   blocks) - if drawing nested arcs it's usually a good idea to set
   strokeWidth to at least 2 so that there are no gaps between each
   arc. The arc method uses a [bresenham algorithm][bres] to plot
   points along the circumference.
 * fill - If true (or present) then the arc will be filled in.
 * quadrants (default:
   `{topleft:true,topright:true,bottomleft:true,bottomright:true}` - An
   object with 4 properties indicating which of the 4 quadrants of a
   circle to draw. If the quadrants property is absent then all 4
   quadrants are drawn.

#### Examples

To draw a 1/4 circle (top right quadrant only) with a radius of 10 and stroke width of 2 blocks ...

    arc({blockType: blocks.iron, 
         meta: 0, 
         radius: 10,
         strokeWidth: 2,
         quadrants: { topright: true },
         orientation: 'vertical', 
         stack: 1,
         fill: false
         });

![arc example 1](img/arcex1.png)

[bres]: http://en.wikipedia.org/wiki/Midpoint_circle_algorithm
[dv]: http://www.minecraftwiki.net/wiki/Data_values

### Drone.door() method

create a door - if a parameter is supplied an Iron door is created otherwise a wooden door is created.

#### Parameters

 * doorType (optional - default wood) - If a parameter is provided then the door is Iron.

#### Example

To create a wooden door at the crosshairs/drone's location...

    var drone = new Drone();
    drone.door();

To create an iron door...

    drone.door( blocks.door_iron );

![iron door](img/doorex1.png)
    
### Drone.door2() method

Create double doors (left and right side)

#### Parameters

 * doorType (optional - default wood) - If a parameter is provided then the door is Iron.

#### Example

To create double-doors at the cross-hairs/drone's location...

    drone.door2();

![double doors](img/door2ex1.png)

### Drone.sign() method

Signs must use block 63 (stand-alone signs) or 68 (signs on walls)

#### Parameters

 * message -  can be a string or an array of strings. 
 * block - can be 63 or 68

#### Example

To create a free-standing sign...

    drone.sign(["Hello","World"],63);

![ground sign](img/signex1.png)

... to create a wall mounted sign...

    drone.sign(["Welcome","to","Scriptopia"], 68);

![wall sign](img/signex2.png)

### Drone Trees methods

 * oak()
 * spruce()
 * birch()
 * jungle()

#### Example

To create 4 trees in a row, point the cross-hairs at the ground then type `/js ` and ...

    up().oak().right(8).spruce().right(8).birch().right(8).jungle();

Trees won't always generate unless the conditions are right. You
should use the tree methods when the drone is directly above the
ground. Trees will usually grow if the drone's current location is
occupied by Air and is directly above an area of grass (That is why
the `up()` method is called first).

![tree example](img/treeex1.png)

None of the tree methods require parameters. Tree methods will only be successful
if the tree is placed on grass in a setting where trees can grow.

### Drone.garden() method

places random flowers and long grass (similar to the effect of placing bonemeal on grass)

#### Parameters

 * width - the width of the garden
 * length - how far from the drone the garden extends

#### Example

To create a garden 10 blocks wide by 5 blocks long...

    garden(10,5);

![garden example](img/gardenex1.png)

### Drone.rand() method

rand takes either an array (if each blockid has the same chance of occurring)
or an object where each property is a blockid and the value is it's weight (an integer)

#### Example

place random blocks stone, mossy stone and cracked stone (each block has the same chance of being picked)

    rand( [blocks.brick.stone, blocks.brick.mossy, blocks.brick.cracked ],w,d,h) 

to place random blocks stone has a 50% chance of being picked, 

    rand({blocks.brick.stone: 5, blocks.brick.mossy: 3, blocks.brick.cracked: 2},w,d,h) 

regular stone has a 50% chance, mossy stone has a 30% chance and cracked stone has just a 20% chance of being picked.

### Copy & Paste using Drone

A drone can be used to copy and paste areas of the game world.

### Drone.copy() method

Copies an area so it can be pasted elsewhere. The name can be used for
pasting the copied area elsewhere...

#### Parameters

 * name - the name to be given to the copied area (used by `paste`)
 * width - the width of the area to copy
 * height - the height of the area to copy
 * length - the length of the area (extending away from the drone) to copy

#### Example

    drone.copy('somethingCool',10,5,10).right(12).paste('somethingCool');

### Drone.paste() method

Pastes a copied area to the current location.

#### Example

To copy a 10x5x10 area (using the drone's coordinates as the starting
point) into memory.  the copied area can be referenced using the name
'somethingCool'. The drone moves 12 blocks right then pastes the copy.

    drone.copy('somethingCool',10,5,10)
         .right(12)
         .paste('somethingCool');

### Chaining

All of the Drone methods return a Drone object, which means methods
can be 'chained' together so instead of writing this...

    drone = new Drone(); 
    drone.fwd(3);
    drone.left(2);
    drone.box(2); // create a grass block 
    drone.up();
    drone.box(2); // create another grass block
    drone.down();

...you could simply write ...
    
    var drone = new Drone().fwd(3).left(2).box(2).up().box(2).down();

... since each Drone method is also a global function that constructs
a drone if none is supplied, you can shorten even further to just...
    
    fwd(3).left(2).box(2).up().box(2).down()

The Drone object uses a [Fluent Interface][fl] to make ScriptCraft
scripts more concise and easier to write and read.  Minecraft's
in-game command prompt is limited to about 80 characters so chaining
drone commands together means more can be done before hitting the
command prompt limit. For complex building you should save your
commands in a new script file and load it using /js load()

[fl]: http://en.wikipedia.org/wiki/Fluent_interface

### Drone Properties

 * x - The Drone's position along the west-east axis (x increases as you move east)
 * y - The Drone's position along the vertical axis (y increses as you move up)
 * z - The Drone's position along the north-south axis (z increases as you move south)
 * dir - The Drone's direction 0 is east, 1 is south , 2 is west and 3 is north.

### Extending Drone

The Drone object can be easily extended - new buidling recipes/blue-prints can be added and can
become part of a Drone's chain using the *static* method `Drone.extend`. 

### Drone.extend() static method

Use this method to add new methods (which also become chainable global functions) to the Drone object.

#### Parameters

 * name - The name of the new method e.g. 'pyramid'
 * function - The method body.

#### Example

    // submitted by [edonaldson][edonaldson]
    Drone.extend('pyramid', function(block,height){
        this.chkpt('pyramid');
        for (var i = height; i > 0; i -= 2) {
            this.box(block, i, 1, i).up().right().fwd();
        }
        return this.move('pyramid');      
    });

Once the method is defined (it can be defined in a new pyramid.js file) it can be used like so...

    var d = new Drone();
    d.pyramid(blocks.brick.stone, 12);

... or simply ...

    pyramid(blocks.brick.stone, 12);

[edonaldson]: https://github.com/edonaldson

### Drone Constants

#### Drone.PLAYER_STAIRS_FACING

An array which can be used when constructing stairs facing in the Drone's direction...

    var d = new Drone();
    d.box(blocks.stairs.oak + ':' + Drone.PLAYER_STAIRS_FACING[d.dir]);

... will construct a single oak stair block facing the drone.

#### Drone.PLAYER_SIGN_FACING

An array which can be used when placing signs so they face in a given direction.
This is used internally by the Drone.sign() method. It should also be used for placing
any of the following blocks...

 * chest 
 * ladder
 * furnace
 * dispenser

To place a chest facing the Drone ...

    drone.box( blocks.chest + ':' + Drone.PLAYER_SIGN_FACING[drone.dir]);

#### Drone.PLAYER_TORCH_FACING

Used when placing torches so that they face towards the drone. 

    drone.box( blocks.torch + ':' + Drone.PLAYER_TORCH_FACING[drone.dir]);

### Drone.times() Method

The times() method makes building multiple copies of buildings easy. It's possible to create rows or grids of buildings without resorting to `for` or `while` loops.

#### Parameters

 * numTimes (optional - default 2) : The number of times you want to repeat the preceding statements.

#### Example

Say you want to do the same thing over and over. You have a couple of options...

 * You can use a for loop...

    d = new Drone(); for (var i =0;i < 4; i++){ d.cottage().right(8); }

While this will fit on the in-game prompt, it's awkward. You need to
declare a new Drone object first, then write a for loop to create the
4 cottages. It's also error prone, even the `for` loop is too much
syntax for what should really be simple.

 * You can use a while loop...
   
    d = new Drone(); var i=4; while (i--){ d.cottage().right(8); }

... which is slightly shorter but still too much syntax. Each of the
above statements is fine for creating a 1-dimensional array of
structures. But what if you want to create a 2-dimensional or
3-dimensional array of structures? Enter the `times()` method.

The `times()` method lets you repeat commands in a chain any number of
times. So to create 4 cottages in a row you would use the following
statement...

    cottage().right(8).times(4);

...which will build a cottage, then move right 8 blocks, then do it
again 4 times over so that at the end you will have 4 cottages in a
row. What's more the `times()` method can be called more than once in
a chain. So if you wanted to create a *grid* of 20 houses ( 4 x 5 ),
you would do so using the following statement...

    cottage().right(8).times(4).fwd(8).left(32).times(5);

... breaking it down...

 1. The first 3 calls in the chain ( `cottage()`, `right(8)`,
    `times(4)` ) build a single row of 4 cottages.

 2. The last 3 calls in the chain ( `fwd(8)`, `left(32)`, `times(5)` )
    move the drone forward 8 then left 32 blocks (4 x 8) to return to
    the original x coordinate, then everything in the chain is
    repeated again 5 times so that in the end, we have a grid of 20
    cottages, 4 x 5.  Normally this would require a nested loop but
    the `times()` method does away with the need for loops when
    repeating builds.

Another example: This statement creates a row of trees 2 by 3 ...

    oak().right(10).times(2).left(20).fwd(10).times(3)

... You can see the results below.

![times example 1](img/times-trees.png)

### Drone.blocktype() method

Creates the text out of blocks. Useful for large-scale in-game signs.

#### Parameters
 
 * message - The message to create - (use `\n` for newlines)
 * foregroundBlock (default: black wool) - The block to use for the foreground
 * backgroundBlock (default: none) - The block to use for the background

#### Example

To create a 2-line high message using glowstone...

    blocktype("Hello\nWorld",blocks.glowstone);

![blocktype example][imgbt1]

[imgbt1]: img/blocktype1.png

### Drone.rainbow() method

Creates a Rainbow.

#### Parameters

 * radius (optional - default:18) - The radius of the rainbow

#### Example
    
    var d = new Drone();
    d.rainbow(30);

![rainbow example](img/rainbowex1.png)

### Drone.sphere() method

Creates a sphere.

#### Parameters
 
 * block - The block the sphere will be made of.
 * radius - The radius of the sphere.

#### Example

To create a sphere of Iron with a radius of 10 blocks...

    sphere( blocks.iron, 10);

![sphere example](img/sphereex1.png)

Spheres are time-consuming to make. You *can* make large spheres (250 radius) but expect the
server to be very busy for a couple of minutes while doing so.

### Drone.sphere0() method

Creates an empty sphere.

#### Parameters
 
 * block - The block the sphere will be made of.
 * radius - The radius of the sphere.

#### Example

To create a sphere of Iron with a radius of 10 blocks...

    sphere0( blocks.iron, 10);

Spheres are time-consuming to make. You *can* make large spheres (250 radius) but expect the
server to be very busy for a couple of minutes while doing so.

### Drone.hemisphere() method

Creates a hemisphere. Hemispheres can be either north or south.

#### Parameters

 * block - the block the hemisphere will be made of.
 * radius - the radius of the hemisphere
 * northSouth - whether the hemisphere is 'north' or 'south'

#### Example

To create a wood 'north' hemisphere with a radius of 7 blocks...

    hemisphere(blocks.oak, 7, 'north');

![hemisphere example](img/hemisphereex1.png)

### Drone.hemisphere0() method

Creates a hollow hemisphere. Hemispheres can be either north or south.

#### Parameters

 * block - the block the hemisphere will be made of.
 * radius - the radius of the hemisphere
 * northSouth - whether the hemisphere is 'north' or 'south'

#### Example

To create a glass 'north' hemisphere with a radius of 20 blocks...

    hemisphere0(blocks.glass, 20, 'north');

![hemisphere example](img/hemisphereex2.png)

### Drone.spiral_stairs() method

Constructs a spiral staircase with slabs at each corner.

#### Parameters

 * stairBlock - The block to use for stairs, should be one of the following...
   - 'oak'
   - 'spruce'
   - 'birch'
   - 'jungle'
   - 'cobblestone'
   - 'brick'
   - 'stone'
   - 'nether'
   - 'sandstone'
   - 'quartz'
 * flights - The number of flights of stairs to build.

![Spiral Staircase](img/spiralstair1.png)

#### Example

To construct a spiral staircase 5 floors high made of oak...

    spiral_stairs('oak', 5);

## Example Plugin #1 - A simple extension to Minecraft.

A simple minecraft plugin. The most basic module.

### Usage: 

At the in-game prompt type ...
  
    /js hello(self)

... and a message `Hello {player-name}` will appear (where
  {player-name} is replaced by your own name).
  
This example demonstrates the basics of adding new functionality which
is only usable by server operators or users with the
scriptcraft.evaluate permission. By default, only ops are granted this
permission.
  
The `hello` function below is only usable by players with the scriptcraft.evaluate 
permission since it relies on the `/js` command to execute.

    exports.hello = function(player){
        player.sendMessage('Hello ' + player.name);
    };

## Example Plugin #2 - Making extensions available for all players.

A simple minecraft plugin. Commands for other players.

### Usage: 

At the in-game prompt type ...
  
    /jsp hello

... and a message `Hello {player-name}` will appear (where {player-name} is 
replaced by your own name).
  
This example demonstrates the basics of adding new functionality
which is usable all players or those with the scriptcraft.proxy
permission.  By default, all players are granted this permission.
  
This differs from example 1 in that a new 'jsp ' command extension
is defined. Since all players can use the `jsp` command, all players
can use the new extension. Unlike the previous example, the `jsp hello` 
command does not evaluate javascript code so this command is much more secure.

    command('hello', function (parameters, player) {
        player.sendMessage('Hello ' + player.name);
    });

## Example Plugin #3 - Limiting use of commands to operators only.

A simple minecraft plugin. Commands for operators only.

### Usage: 

At the in-game prompt type ...
  
    /jsp op-hello

... and a message `Hello {player-name}` will appear (where {player-name} is 
replaced by your own name).
  
This example demonstrates the basics of adding new functionality
which is usable all players or those with the scriptcraft.proxy
permission. By default, all players are granted this permission. In
this command though, the function checks to see if the player is an
operator and if they aren't will return immediately.
 
This differs from example 2 in that the function will only print a
message for operators.

    command('op-hello', function (parameters, player) {
        if (!player.op){
            player.sendMessage('Only operators can do this.');
            return;
        }
        player.sendMessage('Hello ' + player.name);
    });
## Example Plugin #4 - Using parameters in commands.

A simple minecraft plugin. Handling parameters.

### Usage: 

At the in-game prompt type ...
  
    /jsp hello-params Hi
    /jsp hello-params Saludos 
    /jsp hello-params Greetings

... and a message `Hi {player-name}` or `Saludos {player-name}` etc
will appear (where {player-name} is replaced by your own name).
  
This example demonstrates adding and using parameters in commands.
  
This differs from example 3 in that the greeting can be changed from
a fixed 'Hello ' to anything you like by passing a parameter.

    command('hello-params', function (parameters, player) {
        var salutation = parameters[0] ;
        player.sendMessage( salutation + ' ' + player.name);
    });

## Example Plugin #5 - Re-use - Using your own and others modules.

A simple minecraft plugin. Using Modules.

### Usage: 

At the in-game prompt type ...
  
    /jsp hello-module

... and a message `Hello {player-name}` will appear (where {player-name} is 
replaced by your own name).
  
This example demonstrates the use of modules. In
example-1-hello-module.js we created a new javascript module. In
this example, we use that module...

 * We load the module using the `require()` function. Because this
   module and the module we require are n the same directory, we
   specify `'./example-1-hello-module'` as the path (when loading a
   module from the same directory, `./` at the start of the path
   indicates that the file should be searched for in the same
   directory.

 * We assign the loaded module to a variable (`greetings`) and then
   use the module's `hello` method to display the message. 

Source Code...

    var greetings = require('./example-1-hello-module');
    command('hello-module', function( parameters, player ){
        greetings.hello(player);
    });

## Example Plugin #6 - Re-use - Using 'utils' to get Player objects.

A simple minecraft plugin. Finding players by name.

### Usage: 

At the in-game prompt type ...
  
    /jsp hello-byname {player-name}

... substituting {player-name} with the name of a player currently
online and a message `Hello ...` will be sent to the named
player.
  
This example builds on example-5 and also introduces a new concept -
use of shared modules. That is : modules which are not specific to
any one plugin or set of plugins but which can be used by all
plugins. Shared modules should be placed in the
`scriptcraft/modules` directory.
  
 * The utils module is used. Because the 'utils' module is
   located in the modules folder we don't need to specify an exact
   path, just 'utils' will do. 
 
 * The `utils.player()` function is used to obtain a player object
   matching the player name. Once a player object is obtained, a
   message is sent to that player.

Source Code ...

    var utils = require('utils');
    var greetings = require('./example-1-hello-module');

    command('hello-byname', function( parameters, sender ) {
        var playerName = parameters[0];
        var recipient = utils.player(playerName);
        if (recipient)
            greetings.hello(recipient);
        else
            sender.sendMessage('Player ' + playerName + ' not found.');
    });

## Example Plugin #7 - Listening for events, Greet players when they join the game.

A simple event-driven minecraft plugin. How to handle Events.


This example demonstrates event-driven programming. The code below
will display the version of ScriptCraft every time an operator joins
the game. This module is notable from previous modules for the
following reasons...

 1. It does not export any functions or variables. That's fine. Not
    all modules need export stuff. Code in this module will be
    executed when the module is first loaded. Because it is in the
    `/scriptcraft/plugins` directory, it will be loaded automatically
    when the server starts up.

 2. It uses ScriptCraft's `events.on()` function to add a new *Event
    Handler*. An *Event Handler* is a just a function which gets
    called whenever a particular *event* happens in the game. The
    function defined below will only be executed whenever a player
    joins the game. This style of program is sometimes refered to as
    *Event-Driven Programming*.

Adding new *Event Handlers* in ScriptCraft is relatively easy. Use the
`events.on()` function to add a new event handler. It takes 2
parameters...

 1. The Event Name, in this case `'player.PlayerJoinEvent'`. You can
    browse [all possible Bukkit events][bkevts] (click the 'Next
    Package' and 'Previous Package' links to browse).

 2. The event handling function (also sometimes refered to as a
    'callback'). In ScriptCraft, this function takes 2 parameters, a
    listener object and an event object. All of the information about
    the event is in the event object.

In the example below, if a player joins the server and is an operator,
then the ScriptCraft plugin information will be displayed to that
player.

What's also notable about this example is how it uses the [Bukkit
API][bkapi]. The code...

    if (event.player.op)

... is a succinct way of accessing object properties which in Java
would have to be written as ...

    if (event.getPlayer().isOp())

... ScriptCraft uses a special version of JavaScript which comes
bundled with Java (Minecraft is written in Java) and JavaScript in
Java can access properties of Java objects more succinctly than in
Java itself. What this means in practice is that when you're perusing
the [Bukkit API Reference][bkapi] and come across a method like
[Player.getAllowFlight()][bkgaf], you can write code like this...

    var allowFlight = player.getAllowFlight(); // java style

... or the more succinct ...

    var allowFlight = player.allowFlight; // javascript style

... Which style you choose is up to you but `player.allowFlight` is
cleaner and more readable. Similarly where you see a method like
[Player.setAllowFlight()][bksaf], you can write ...

    player.setAllowFlight(true); // java style

... or the more readable...

    player.allowFlight = true; // javascript style

... Which style you choose is up to you.

[bkevts]: http://jd.bukkit.org/dev/apidocs/org/bukkit/event/package-summary.html
[bkgaf]: http://jd.bukkit.org/dev/apidocs/org/bukkit/entity/Player.html#getAllowFlight()
[bksaf]: http://jd.bukkit.org/dev/apidocs/org/bukkit/entity/Player.html#setAllowFlight()
[bkapi]: http://jd.bukkit.org/dev/apidocs/

    events.on('player.PlayerJoinEvent', function (listener, event){
        if (event.player.op) {
            event.player.sendMessage('Welcome to ' + __plugin);
        }
    });

## Arrows Plugin

The arrows mod adds fancy arrows to the game. Arrows which... 

 * Launch fireworks.
 * Explode on impact. 
 * Force Lightning to strike where they land.
 * Teleport the player to the landing spot.
 * Spawn Trees at the landing spot.

### Usage: 

  * `/js arrows.firework(self)` - A firework launches where the the arrow lands.
  * `/js arrows.lightning(self)` - lightning strikes where the arrow lands.
  * `/js arrows.teleport(self)` - makes player teleport to where arrow has landed.
  * `/js arrows.flourish(self)` - makes a tree grow where the arrow lands.
  * `/js arrows.explosive(self)` - makes arrows explode.
  * `/js arrows.normal(self)` sets arrow type to normal.
  * `/js arrows.sign(self)` turns a targeted sign into a Arrows menu

All of the above functions can take an optional player object or name
as a parameter. For example: `/js arrows.explosive('player23')` makes
player23's arrows explosive.
 
## alias Plugin

The alias module lets players and server admins create their own
per-player or global custom in-game command aliases.

### Examples

To set a command alias which is only visible to the current player
(per-player alias)...

    /jsp alias set cw = time set {1} ; weather {2}

... Creates a new custom command only usable by the player who set
it called `cw` (short for set Clock and Weather) which when invoked...

    /cw 4000 sun

... will perform the following commands...

    /time set 4000
    /weather sun

Aliases can use paramters as above. On the right hand side of the `=`, the 
`{1}` refers to the first parameter provided with the `cw` alias, `{2}`
refers to the second parameter and so on. So `cw 4000 sun` is converted to 
`time set 4000` and `weather sun`. 

To set a global command alias usable by all (only operators can create
such an alias)...

    /jsp alias global stormy = time 18000; weather storm

To delete an alias ...

    /jsp alias delete cw

... deletes the 'cw' alias from the appropriate alias map.

To get a list of aliases currently defined...

    /jsp alias list

To get help on the `jsp alias` command:

    /jsp alias help

Aliases can be used at the in-game prompt by players or in the server
console.  Aliases will not be able to avail of command autocompletion
(pressing the TAB key will have no effect).

## Classroom Plugin

The `classroom` object contains a couple of utility functions for use
in a classroom setting. The goal of these functions is to make it
easier for tutors to facilitate ScriptCraft for use by students in a
classroom environment. Although granting ScriptCraft access to
students on a shared server is potentially risky (Students can
potentially abuse it), it is slighlty less risky than granting
operator privileges to each student. (Enterprising students will
quickly realise how to grant themselves and others operator privileges
once they have access to ScriptCraft).

The goal of this module is not so much to enforce restrictions
(security or otherwise) but to make it easier for tutors to setup a shared server
so students can learn Javascript.

### classroom.allowScripting() function

Allow or disallow anyone who connects to the server (or is already
connected) to use ScriptCraft. This function is preferable to granting 'ops' privileges 
to every student in a Minecraft classroom environment.

#### Parameters

 * canScript : true or false

#### Example

To allow all players (and any players who connect to the server) to
use the `js` and `jsp` commands...

    /js classroom.allowScripting(true,self)

To disallow scripting (and prevent players who join the server from using the commands)...

    /js classroom.allowScripting(false,self)

Only ops users can run the classroom.allowScripting() function - this is so that students 
don't try to bar themselves and each other from scripting.

## Commando Plugin

### Description

commando is a plugin which can be used to add completely new commands
to Minecraft.  Normally ScriptCraft only allows for provision of new
commands as extensions to the jsp command. For example, to create a
new simple command for use by all players...

    /js command('hi', function(args,player){ player.sendMessage('Hi ' + player.name); });
  
... then players can use this command by typing...

    /jsp hi

... A couple of ScriptCraft users have asked for the ability to take
this a step further and allow the global command namespace to be
populated so that when a developer creates a new command using the
'command' function, then the command is added to the global command
namespace so that players can use it simply like this...

    /hi

... There are good reasons why ScriptCraft's core `command()` function
does not do this. Polluting the global namespace with commands would
make ScriptCraft a bad citizen in that Plugins should be able to work
together in the same server and - as much as possible - not step on
each others' toes. The CraftBukkit team have very good reasons for
forcing Plugins to declare their commands in the plugin.yml
configuration file. It makes approving plugins easier and ensures that
craftbukkit plugins behave well together. While it is possible to
override other plugins' commands, the CraftBukkit team do not
recommend this. However, as ScriptCraft users have suggested, it
should be at the discretion of server administrators as to when
overriding or adding new commands to the global namespace is good.

So this is where `commando()` comes in. It uses the exact same
signature as the core `command()` function but will also make the
command accessible without the `jsp` prefix so instead of having to
type `/jsp hi` for the above command example, players simply type
`/hi` . This functionality is provided as a plugin rather than as part
of the ScriptCraft core.

### Example hi-command.js

    var commando = require('../commando');
    commando('hi', function(args,player){
       player.sendMessage('Hi ' + player.name);
    });

...Displays a greeting to any player who issues the `/hi` command.

### Example - timeofday-command.js 

    var times = {Dawn: 0, Midday: 6000, Dusk: 12000, Midnight:18000};
    commando('timeofday', function(params,player){
           player.location.world.setTime(times[params[0]]);
       },
       ['Dawn','Midday','Dusk','Midnight']);

... changes the time of day using a new `/timeofday` command (options are Dawn, Midday, Dusk, Midnight)

### Caveats

Since commands registered using commando are really just appendages to
the `/jsp` command and are not actually registered globally (it just
looks like that to the player), you won't be able to avail of tab
completion for the command itself or its parameters (unless you go the
traditional route of adding the `jsp` prefix). This plugin uses the
[PlayerCommandPreprocessEvent][pcppevt] which allows plugins to
intercepts all commands and inject their own commands instead. If
anyone reading this knows of a better way to programmatically add new
global commands for a plugin, please let me know.

[pcppevt]: http://jd.bukkit.org/dev/apidocs/org/bukkit/event/player/PlayerCommandPreprocessEvent.html

## homes Plugin

The homes plugin lets players set a location as home and return to the
location, invite other players to their home and also visit other
player's homes.

This module is a good example of how to create a javascript-based
minecraft mod which provides...

 * A programmatic interface (API) and 
 * A command extension which uses that API to provide new functionality for players.

The module uses the `plugin()` function to specify an object and
methods, and the `command()` function to expose functionality to
players through a new `jsp home` command. This module also
demonstrates how to enable autocompletion for custom commands (to see
this in action, at the in-game prompt or server console prompt type
`jsp home ` then press the TAB key - you should see a list of further
possible options).

The `jsp home` command has the following options...

### Basic options

 * `/jsp home set` Will set your current location as your
   'home' location to which you can return at any time using the ...

 * `/jsp home` ..command will return you to your home, if you have set one.

 * `/jsp home <player>` Will take you to the home of <player> (where 
   <player> is the name of the player whose home you wish to visit.

 * `/jsp home delete` Deletes your home location from the location
   database. This does not actually remove the home from the world or
   change the world in any way. This command is completely
   non-destructive and cannot be used for griefing. No blocks will be
   destroyed by this command.

### Social options
The following options allow players to open their homes to all or some
players, invite players to their home and see a list of homes they can
visit.

 * `/jsp home list` Lists home which you can visit.
 * `/jsp home ilist` Lists players who can visit your home.
 * `/jsp home invite <player>` Invites the named player to your home.
 * `/jsp home uninvite <player>` Uninvites (revokes invitation) the named player to your home.
 * `/jsp home public` Opens your home to all players (all players can visit your home).
 * `/jsp home private` Makes your home private (no longer visitable by all).

### Administration options
The following administration options can only be used by server operators...

 * `/jsp home listall` List all of the homes
 * `/jsp home clear <player>` Removes the player's home
   location. Again, this command does not destroy any structures in
   the world, it simply removes the location from the database. No
   blocks are destroyed by this command.

## NumberGuess mini-game: 

### Description
This is a very simple number guessing game. Minecraft will ask you to
guess a number between 1 and 10 and you will tell you if you're too
hight or too low when you guess wrong. The purpose of this mini-game
code is to demonstrate use of Bukkit's Conversation API.

### Example
    
    /js Game_NumberGuess.start(self)

Once the game begins, guess a number by typing the `/` character
followed by a number between 1 and 10.

## SnowballFight mini-game

### Description

This is a rough and ready prototype of a simple multi-player
shoot-em-up. To start a game with all players playing against one another...

    /js new Game_SnowballFight(60).start();

... this obviously works best if all of the players are in close
proximity within the same game world. Alternatively you can have team
matches...


    /js var redTeam = ['<player1>','<player2>',...etc]
    /js var blueTeam = ['<player3>','<player4>,...etc]
    /js var greenTeam = ['<player5>','<player6>,...etc]
    /js new Game_SnowballFight(60, {red: redTeam,blue: blueTeam,green: greenTeam}).start();

Or you can just have specific players play against each other...

    /js new Game_SnowballFight(60, ['player1','player2','player3']).start();

(where 'player1' etc are the names of actual players)
  
You specify the teams in the game as an object where each property's
name is a team name and each property's value is the list of players
on that team.  You specify the duration of the game (in seconds) You
kick off the game with the start() method.  I need to work on a
better in-game mechanism for players to choose teams and start the
game but this will do for now.

When the game starts, each player is put in survival mode and given
snowballs. The aim of the game is to hit players on opposing teams. If
you hit a player on your own team, you lose a point.
  
At the end of the game the scores for each team are broadcast and each
player returns to their previous mode of play (creative or
survival). Create a small arena with a couple of small buildings for
cover to make the game more fun.