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sbt-assembly merge strategy for aop.xml files
// Create a new MergeStrategy for aop.xml files
val aopMerge: MergeStrategy = new MergeStrategy {
val name = "aopMerge"
import scala.xml._
import scala.xml.dtd._
def apply(tempDir: File, path: String, files: Seq[File]): Either[String, Seq[(File, String)]] = {
val dt = DocType("aspectj", PublicID("-//AspectJ//DTD//EN", "http://www.eclipse.org/aspectj/dtd/aspectj.dtd"), Nil)
val file = MergeStrategy.createMergeTarget(tempDir, path)
val xmls: Seq[Elem] = files.map(XML.loadFile)
val aspectsChildren: Seq[Node] = xmls.flatMap(_ \\ "aspectj" \ "aspects" \ "_")
val weaverChildren: Seq[Node] = xmls.flatMap(_ \\ "aspectj" \ "weaver" \ "_")
val options: String = xmls.map(x => (x \\ "aspectj" \ "weaver" \ "@options").text).mkString(" ").trim
val weaverAttr = if (options.isEmpty) Null else new UnprefixedAttribute("options", options, Null)
val aspects = new Elem(null, "aspects", Null, TopScope, false, aspectsChildren: _*)
val weaver = new Elem(null, "weaver", weaverAttr, TopScope, false, weaverChildren: _*)
val aspectj = new Elem(null, "aspectj", Null, TopScope, false, aspects, weaver)
XML.save(file.toString, aspectj, "UTF-8", xmlDecl = false, dt)
IO.append(file, IO.Newline.getBytes(IO.defaultCharset))
Right(Seq(file -> path))
}
}
// Use defaultMergeStrategy with a case for aop.xml
// I like this better than the inline version mentioned in assembly's README
val customMergeStrategy: String => MergeStrategy = {
case PathList("META-INF", "aop.xml") =>
aopMerge
case s =>
defaultMergeStrategy(s)
}
// Use the customMergeStrategy in your settings
mergeStrategy in assembly := customMergeStrategy
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