bundle.ps1

##################################################
#resources
##################################################
#http://blogs.msdn.com/b/kalleb/archive/2008/07/19/using-powershell-to-read-xml-files.aspx
#http://tfl09.blogspot.com/2007/11/formatting-with-powershell.html
#http://www.powershellpro.com/powershell-tutorial-introduction/powershell-tutorial-conditional-logic/
##################################################
#resources
##################################################

$solutionDir = ".\"
$projectDir = "{0}BundleMinifyStuffTry\" -f $solutionDir
$bundleXml = "{0}App_Data\Bundle.xml" -f $projectDir
$bundleXmlFullPath = (resolve-path $bundleXml).Path

sal ___AjaxMin .\tools\AjaxMin.exe

$bundleXmlFile = [xml](get-content($bundleXmlFullPath))

$bundleTypes = $bundleXmlFile.metadata.types.item
$bundleBundles = $bundleXmlFile.metadata.bundles.bundle

foreach($type in $bundleTypes) { 

	$_type = $type.type
	$_fileExtension = $type.fileExtension
	$_rootDir = $type.rootDir
	$_rootDestination = $type.rootDestination
	$_copyFiles = $type.copyFiles

	$_destinationDir = "{0}{1}" -f $projectDir, $_rootDestination

	#test if the dir exists and create if not
	if(!(Test-Path $_destinationDir)) { 

		#destination dir does not exist, creating it
		mkdir $_destinationDir
	}

	$_bundle = $bundleBundles | where { $_.type -eq $_type }

	foreach($__bundle in $_bundle) { 

		$__output = $__bundle.output
		$__outputFileDir = "{0}{1}.min.{2}" -f $_destinationDir, $__output, $_fileExtension

		$__fileNamesState
		foreach($__file in $__bundle.file) { 

			$__fileName = '"{0}{1}{2}.{3}"' -f $projectDir, $_rootDir, $__file.dir, $_fileExtension
			$__fileNamesState += "{0} " -f $__fileName
		}

		$__filesToBundle = $__fileNamesState

		#bundle and minify
		___AjaxMin -clobber $__filesToBundle -o $__outputFileDir

		$__fileNamesState = $null
	}

	if($_copyFiles) { 

		Copy-Item ("{0}{1}*" -f $projectDir, $_rootDir) $_destinationDir -force -recurse
	}
}

bundle.xml

<?xml version="1.0" encoding="utf-8" ?>
<metadata>
  
  <types>
    <item type="js" fileExtension="js" rootDir="scripts/" rootDestination="assets/js/" />
    <item type="css" fileExtension="css" rootDir="content/" rootDestination="assets/css/" copyFiles="true" />
  </types>
  
  <bundles>
    <!--CSS Bundles-->
    <bundle type="css" output="global">
      <file dir="bootstrap" />
      <file dir="style" />
    </bundle>

    <!--JS Bundles-->
    <bundle type="js" output="global">
      <file dir="jquery-1.7.2" />
      <file dir="jquery-ui-1.8.20" />
      <file dir="knockout-2.1.0.debug" />
      <file dir="jquery.validate" />
      <file dir="jquery.validate.unobtrusive" />
      <file dir="bootstrap" />
    </bundle>
    <bundle type="js" output="app/index">
      <file dir="app/index" />
    </bundle>
  </bundles>
</metadata>