From 989c1d3dc603b1746ffb5f007fc1318079d64255 Mon Sep 17 00:00:00 2001
From: Mark Harrah <dmharrah@gmail.com>
Date: Fri, 28 Jun 2013 00:01:19 -0400
Subject: [PATCH] auto-generate conscript launchconfigs from launcher
 boot.properties

---
 project/Sbt.scala       |  5 +++--
 project/Transform.scala | 28 ++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/project/Sbt.scala b/project/Sbt.scala
index 0e359c164..e857ed437 100644
--- a/project/Sbt.scala
+++ b/project/Sbt.scala
@@ -205,7 +205,8 @@ object Sbt extends Build
 		import Sxr.sxr
 	def releaseSettings = Release.settings(nonRoots, proguard in Proguard)
 	def rootSettings = releaseSettings ++ Docs.settings ++ LaunchProguard.settings ++ LaunchProguard.specific(launchSub) ++ 
-		Sxr.settings ++ docSetting ++ Util.publishPomSettings ++ otherRootSettings ++ proguardedLauncherSettings
+		Sxr.settings ++ docSetting ++ Util.publishPomSettings ++ otherRootSettings ++ proguardedLauncherSettings ++
+		Transform.conscriptSettings(launchSub)
 	def otherRootSettings = Seq(
 		scripted <<= scriptedTask,
 		scriptedSource <<= (sourceDirectory in sbtSub) / "sbt-test",
@@ -230,7 +231,7 @@ object Sbt extends Build
 		autoScalaLibrary := false,
 		description := "sbt application launcher",
 		publishLauncher <<= publish,
-		packageBin in Compile <<= (proguard in Proguard).map(x => x)
+		packageBin in Compile <<= (proguard in Proguard, Transform.conscriptConfigs).map( (x,y) => x)
 	)
 	def docSetting = inConfig(Compile)(inTask(sxr)(Defaults.docSetting(doc in ThisScope.copy(task = Global, config = Global))))
 
diff --git a/project/Transform.scala b/project/Transform.scala
index fe5635d1b..03dbd3373 100644
--- a/project/Transform.scala
+++ b/project/Transform.scala
@@ -15,6 +15,34 @@ object Transform
 	lazy val inputResources = TaskKey[Seq[File]]("input-resources")
 	lazy val resourceProperties = TaskKey[Map[String,String]]("resource-properties")
 
+	lazy val conscriptConfigs = TaskKey[Unit]("conscript-configs")
+
+	def conscriptSettings(launch: Reference) = Seq(
+		conscriptConfigs <<= (managedResources in launch in Compile, sourceDirectory in Compile).map { (res, src) =>
+			val source = res.filter(_.getName == "sbt.boot.properties").headOption getOrElse error("No managed boot.properties file.")
+			copyConscriptProperties(source, src / "conscript")
+			()
+		}
+	)
+	def copyConscriptProperties(source: File, conscriptBase: File): Seq[File] =
+	{
+		IO.delete(conscriptBase)
+		val pairs = Seq(
+			"sbt.xMain" -> "sbt",
+			"sbt.ScriptMain" -> "scalas",
+			"sbt.ConsoleMain" -> "screpl"
+		)
+		for( (main, dir) <- pairs) yield {
+			val file = conscriptBase / dir / "launchconfig"
+			copyPropertiesFile(source, main, file)
+			file
+		}
+	}
+	def copyPropertiesFile(source: File, newMain: String, target: File) {
+		def subMain(line: String): String  =  if(line.trim.startsWith("class:")) "  class: " + newMain else line
+		IO.writeLines(target, IO.readLines(source) map subMain)
+	}
+
 	def crossGenSettings = transSourceSettings ++ seq(
 		sourceProperties := Map("cross.package0" -> "sbt", "cross.package1" -> "cross")
 	)