An improved sbt build file for Scalatron

Build.scala

// Based off http://jmhofer.johoop.de/?p=292 / https://gist.github.com/2260897
// Put this file under project/Build.scala
// Copy Scalatron/bin/Scalatron.jar to lib/ before compiling
// Tested with sbt version 0.11.2

import sbt._
import Keys._

object Build extends Build {
	val botDirectory = SettingKey[File]("bot-directory")
	val play = TaskKey[Unit]("play") <<= (botDirectory, name, javaOptions,
	          unmanagedClasspath in Compile,
	          Keys.`package` in Compile) map {
	            (bots, name, javaOptions, ucp, botJar) =>

      IO createDirectory (bots / name)
      IO copyFile (botJar, bots / name / "ScalatronBot.jar")

      val cmd = "java %s -cp %s scalatron.main.Main -plugins %s" format (
          javaOptions mkString " ",
          Seq(ucp.files.head, botJar).absString,
          bots.absolutePath)
      cmd run
	}

  	val bot = Project(
    	id = "mybot",
    	base = file("."),
    	settings = Project.defaultSettings ++ botSettings)

  	val botSettings = Seq[Setting[_]](
    	organization := "com.example.foo",
    	name := "my-scalatron-bot",
    	version := "1.0-SNAPSHOT",

    	scalaVersion := "2.9.1",
    	scalacOptions ++= Seq("-deprecation", "-unchecked"),
		javaOptions += "-Xmx1g",

		libraryDependencies ++= Seq(
	  		"org.specs2" %% "specs2" % "1.8.2" % "test",
	  		"org.pegdown" % "pegdown" % "1.0.2" % "test",
	  		"junit" % "junit" % "4.7" % "test"),

		testOptions := Seq(
			Tests.Filter(_ == "de.johoop.scalatron.BotSpec"),
			Tests.Argument("html", "console")),

		testOptions <+= crossTarget map { ct =>
	  		Tests.Setup { () =>
	    		System.setProperty("specs2.outDir",
	        		new File(ct, "specs2").getAbsolutePath)
	  			}
		},
        botDirectory := file("bots"),
        play)
}