Adds `dependencyPositions` task to explicitly track dependency positions.

ivy/src/main/scala/sbt/IvyActions.scala

@@ -31,10 +31,10 @@ final case class GetClassifiersConfiguration(module: GetClassifiersModule, exclu
 final case class GetClassifiersModule(id: ModuleID, modules: Seq[ModuleID], configurations: Seq[Configuration], classifiers: Seq[String])
 
 final class UnresolvedWarningConfiguration private[sbt] (
-  val modulePositions: Seq[(ModuleID, SourcePosition)])
+  val modulePositions: Map[ModuleID, SourcePosition])
 object UnresolvedWarningConfiguration {
-  def apply(): UnresolvedWarningConfiguration = apply(Seq())
-  def apply(modulePositions: Seq[(ModuleID, SourcePosition)]): UnresolvedWarningConfiguration =
+  def apply(): UnresolvedWarningConfiguration = apply(Map())
+  def apply(modulePositions: Map[ModuleID, SourcePosition]): UnresolvedWarningConfiguration =
     new UnresolvedWarningConfiguration(modulePositions)
 }
 

main/actions/src/main/scala/sbt/CacheIvy.scala

@@ -56,6 +56,7 @@ object CacheIvy {
   /*	def deliverIC: InputCache[IvyConfiguration :+: ModuleSettings :+: DeliverConfiguration :+: HNil] = implicitly
 	def publishIC: InputCache[IvyConfiguration :+: ModuleSettings :+: PublishConfiguration :+: HNil] = implicitly*/
   lazy val moduleIDSeqIC: InputCache[Seq[ModuleID]] = implicitly
+  lazy val modulePositionMapFormat: Format[Map[ModuleID, SourcePosition]] = implicitly
 
   implicit lazy val updateReportFormat: Format[UpdateReport] =
     {
@@ -97,9 +98,6 @@ object CacheIvy {
         case (2, p, s, e) => RangePosition(p, LineRange(s, e))
       }
     )
-  implicit def unresolvedWarningConfigurationFormat: Format[UnresolvedWarningConfiguration] =
-    wrap[UnresolvedWarningConfiguration, (Seq[(ModuleID, SourcePosition)])](c => (c.modulePositions), { case ps => UnresolvedWarningConfiguration(ps) })
-
   private[this] final val DisabledValue = 0
   private[this] final val BinaryValue = 1
   private[this] final val FullValue = 2

main/src/main/scala/sbt/Defaults.scala

@@ -1101,7 +1101,8 @@ object Classpaths {
     transitiveUpdate <<= transitiveUpdateTask,
     updateCacheName := "update_cache" + (if (crossPaths.value) s"_${scalaBinaryVersion.value}" else ""),
     evictionWarningOptions in update := EvictionWarningOptions.default,
-    unresolvedWarningConfiguration in update <<= unresolvedWarningConfigurationTask,
+    dependencyPositions <<= dependencyPositionsTask,
+    unresolvedWarningConfiguration in update := UnresolvedWarningConfiguration(dependencyPositions.value),
     update <<= updateTask tag (Tags.Update, Tags.Network),
     update := {
       import ShowLines._
@@ -1220,7 +1221,7 @@ object Classpaths {
     updateReportFormat,
     excludeMap,
     moduleIDSeqIC,
-    unresolvedWarningConfigurationFormat
+    modulePositionMapFormat
   }
 
   def withExcludes(out: File, classifiers: Seq[String], lock: xsbti.GlobalLock)(f: Map[ModuleID, Set[String]] => UpdateReport): UpdateReport =
@@ -1314,13 +1315,14 @@ object Classpaths {
     }
   private[this] def fileUptodate(file: File, stamps: Map[File, Long]): Boolean =
     stamps.get(file).forall(_ == file.lastModified)
-  private[sbt] def unresolvedWarningConfigurationTask: Initialize[Task[UnresolvedWarningConfiguration]] = Def.task {
+  private[sbt] def dependencyPositionsTask: Initialize[Task[Map[ModuleID, SourcePosition]]] = Def.task {
     val projRef = thisProjectRef.value
     val st = state.value
     val s = streams.value
     val cacheFile = s.cacheDirectory / updateCacheName.value
-    implicit val uwConfigCache = moduleIDSeqIC
-    def modulePositions: Seq[(ModuleID, SourcePosition)] =
+    implicit val depSourcePosCache = moduleIDSeqIC
+    implicit val outFormat = modulePositionMapFormat
+    def modulePositions: Map[ModuleID, SourcePosition] =
       try {
         val extracted = (Project extract st)
         val sk = (libraryDependencies in (GlobalScope in projRef)).scopedKey
@@ -1329,18 +1331,19 @@ object Classpaths {
           (s.key.key == libraryDependencies.key) &&
             (s.key.scope.project == Select(projRef))
         }
-        settings flatMap {
+        Map(settings flatMap {
           case s: Setting[Seq[ModuleID]] @unchecked =>
             s.init.evaluate(empty) map { _ -> s.pos }
-        }
+        }: _*)
       } catch {
-        case _: Throwable => Seq()
+        case _: Throwable => Map()
       }
-    val outCacheFile = cacheFile / "output_uwc"
-    val f = Tracked.inputChanged(cacheFile / "input_uwc") { (inChanged: Boolean, in: Seq[ModuleID]) =>
-      val outCache = Tracked.lastOutput[Seq[ModuleID], UnresolvedWarningConfiguration](outCacheFile) {
+
+    val outCacheFile = cacheFile / "output_dsp"
+    val f = Tracked.inputChanged(cacheFile / "input_dsp") { (inChanged: Boolean, in: Seq[ModuleID]) =>
+      val outCache = Tracked.lastOutput[Seq[ModuleID], Map[ModuleID, SourcePosition]](outCacheFile) {
         case (_, Some(out)) if !inChanged => out
-        case _                            => UnresolvedWarningConfiguration(modulePositions)
+        case _                            => modulePositions
       }
       outCache(in)
     }

main/src/main/scala/sbt/Keys.scala

@@ -244,6 +244,7 @@ object Keys {
   val updateConfiguration = SettingKey[UpdateConfiguration]("update-configuration", "Configuration for resolving and retrieving managed dependencies.", DSetting)
   val updateOptions = SettingKey[UpdateOptions]("update-options", "Options for resolving managed dependencies.", DSetting)
   val unresolvedWarningConfiguration = TaskKey[UnresolvedWarningConfiguration]("unresolved-warning-configuration", "Configuration for unresolved dependency warning.", DTask)
+  val dependencyPositions = TaskKey[Map[ModuleID, SourcePosition]]("dependency-positions", "Source positions where the dependencies are defined.", DTask)
   val ivySbt = TaskKey[IvySbt]("ivy-sbt", "Provides the sbt interface to Ivy.", CTask)
   val ivyModule = TaskKey[IvySbt#Module]("ivy-module", "Provides the sbt interface to a configured Ivy module.", CTask)
   val updateCacheName = TaskKey[String]("updateCacheName", "Defines the directory name used to store the update cache files (inside the streams cacheDirectory).", DTask)

notes/0.13.6.md

@@ -95,7 +95,7 @@ sbt 0.13.6 now allows `enablePlugins` and `disablePlugins` to be written directl
 ### Unresolved dependencies error
 
 sbt 0.13.6 will try to reconstruct dependencies tree when it fails to resolve a managed dependency.
-This is an approximation, but it should help you figure out where the problematic dependency is coming from:
+This is an approximation, but it should help you figure out where the problematic dependency is coming from. When possible sbt will display the source position next to the modules:
 
     [warn]  ::::::::::::::::::::::::::::::::::::::::::::::
     [warn]  ::          UNRESOLVED DEPENDENCIES         ::