Add support for bat scripts

Author: bantonsson

src/main/scala/com/lightbend/sbt/javaagent/JavaAgentPackaging.scala

@@ -7,6 +7,7 @@ package com.lightbend.sbt.javaagent
 import sbt._
 import sbt.Keys._
 import com.typesafe.sbt.packager.archetypes.JavaAppPackaging.autoImport.bashScriptExtraDefines
+import com.typesafe.sbt.packager.archetypes.JavaAppPackaging.autoImport.batScriptExtraDefines
 import com.typesafe.sbt.packager.universal.UniversalPlugin.autoImport.Universal
 import java.io.File
 
@@ -22,7 +23,8 @@ object JavaAgentPackaging extends AutoPlugin {
 
   override def projectSettings = Seq(
     mappings in Universal ++= agentMappings.value.map(m => m._1 -> m._2),
-    bashScriptExtraDefines ++= agentScriptOptions.value
+    bashScriptExtraDefines ++= agentBashScriptOptions.value,
+    batScriptExtraDefines ++= agentBatScriptOptions.value
   )
 
   private def agentMappings = Def.task[Seq[(File, String, String)]] {
@@ -33,14 +35,26 @@ object JavaAgentPackaging extends AutoPlugin {
     }
   }
 
-  private def agentScriptOptions = Def.task[Seq[String]] {
+  private def agentBashScriptOptions = Def.task[Seq[String]] {
     agentMappings.value map {
-      case (_, path, arguments) => s"""addJava "-javaagent:$${app_home}/../${normalizePath(path)}$arguments" """
+      case (_, path, arguments) => s"""addJava "-javaagent:$${app_home}/../${normalizeBashPath(path)}$arguments" """
     }
   }
 
-  private def normalizePath(path: String, separator: Char = File.separatorChar): String = {
-    if (separator == '/') path else path.replace(separator, '/')
+  private def normalizeBashPath(path: String, separator: Char = File.separatorChar): String =
+    normalizePath(path, '/')
+
+  private def agentBatScriptOptions = Def.task[Seq[String]] {
+    agentMappings.value map {
+      case (_, path, arguments) => s"""set _JAVA_OPTS=-javaagent:%@@APP_ENV_NAME@@_HOME%\\${normalizeBatPath(path)}$arguments %_JAVA_OPTS%"""
+    }
+  }
+
+  private def normalizeBatPath(path: String, separator: Char = File.separatorChar): String =
+    normalizePath(path, '\\')
+
+  private def normalizePath(path: String, expected: Char, actual: Char = File.separatorChar): String = {
+    if (actual == expected) path else path.replace(actual, expected)
   }
 
   /**