Add post pom processor to make sure that casbah dependency in pom gen…

…erated for salat-core specifies type "pom" - otherwise sbt is fine but Maven proper will fail with an error trying to download a jar for an aggregator pom.

project/SalatBuild.scala

@@ -103,6 +103,10 @@ object Publish {
     pomIncludeRepository := { _ => false },
     licenses := Seq("Apache 2.0" -> url("http://www.apache.org/licenses/LICENSE-2.0")),
     homepage := Some(url("https://github.com/novus/salat")),
+    pomPostProcess := {
+      (pomXML: scala.xml.Node) =>
+        PomPostProcessor(pomXML)
+    },
     pomExtra := (
       <scm>
         <url>git://github.com/novus/salat.git</url>
@@ -118,13 +122,40 @@ object Publish {
   )
 }
 
+object PomPostProcessor {
+  import scala.xml._
+
+  // see https://groups.google.com/d/topic/simple-build-tool/pox4BwWshtg/discussion
+  // adding a post pom processor to make sure that pom for salat-core correctly specifies depdency type pom for casbah dependency
+
+  def apply(pomXML: Node): Node = {
+    def rewrite(pf: PartialFunction[Node, Node])(ns: Seq[Node]): Seq[Node] = for (subnode <- ns) yield subnode match {
+      case e: Elem =>
+        if (pf isDefinedAt e) pf(e)
+        else Elem(e.prefix, e.label, e.attributes, e.scope, rewrite(pf)(e.child): _*)
+      case other => other
+    }
+
+    val rule: PartialFunction[Node, Node] = {
+      case e @ Elem(prefix, "dependency", attribs, scope, children @ _*) => {
+        if (children.contains(<groupId>org.mongodb</groupId>)) {
+          Elem(prefix, "dependency", attribs, scope, children ++ <type>pom</type>: _*)
+        }
+        else e
+      }
+    }
+
+    rewrite(rule)(pomXML.theSeq)(0)
+  }
+}
+
 object Dependencies {
   val specs2 = "org.specs2" %% "specs2" % "1.11" % "test"
   val commonsLang = "commons-lang" % "commons-lang" % "2.5" % "test"
   val slf4jApi = "org.slf4j" % "slf4j-api" % "1.6.4"
   val logbackCore = "ch.qos.logback" % "logback-core" % "1.0.0" % "test"
   val logbackClassic = "ch.qos.logback" % "logback-classic" % "1.0.0" % "test"
-  val casbah = "org.mongodb" %% "casbah" % "2.4.1"
+  val casbah = "org.mongodb" %% "casbah" % "2.4.1" artifacts( Artifact("casbah", "pom", "pom") )
   val lift_json = "net.liftweb" %% "lift-json" % "2.5-SNAPSHOT"
 }