Add support for intransitive dependencies

core/shared/src/main/scala/coursier/core/Definitions.scala

@@ -44,7 +44,9 @@ case class Dependency(
 
   // Maven-specific
   attributes: Attributes,
-  optional: Boolean
+  optional: Boolean,
+
+  transitive: Boolean
 ) {
   def moduleVersion = (module, version)
 }

core/shared/src/main/scala/coursier/core/Resolution.scala

@@ -434,14 +434,17 @@ case class Resolution(
     new mutable.HashMap[Dependency, Seq[Dependency]]()
   private def finalDependencies0(dep: Dependency) =
     finalDependenciesCache.synchronized {
-      finalDependenciesCache.getOrElseUpdate(dep,
-        projectCache.get(dep.moduleVersion) match {
-          case Some((_, proj)) =>
-            finalDependencies(dep, proj)
-              .filter(filter getOrElse defaultFilter)
-          case None => Nil
-        }
-      )
+      finalDependenciesCache.getOrElseUpdate(dep, {
+        if (dep.transitive)
+          projectCache.get(dep.moduleVersion) match {
+            case Some((_, proj)) =>
+              finalDependencies(dep, proj)
+                .filter(filter getOrElse defaultFilter)
+            case None => Nil
+          }
+        else
+          Nil
+      })
     }
 
   /**

core/shared/src/main/scala/coursier/ivy/IvyXml.scala

@@ -69,14 +69,22 @@ object IvyXml {
           rawConf <- node.attribute("conf").toOption.toSeq
           (fromConf, toConf) <- mappings(rawConf)
           attr = node.attributesFromNamespace(attributesNamespace)
-        } yield fromConf -> Dependency(
-          Module(org, name, attr.toMap),
-          version,
-          toConf,
-          allConfsExcludes ++ excludes.getOrElse(fromConf, Set.empty),
-          Attributes("jar", ""), // should come from possible artifact nodes
-          optional = false
-        )
+        } yield {
+          val transitive = node.attribute("transitive").toOption match {
+            case Some("false") => false
+            case _ => true
+          }
+
+          fromConf -> Dependency(
+            Module(org, name, attr.toMap),
+            version,
+            toConf,
+            allConfsExcludes ++ excludes.getOrElse(fromConf, Set.empty),
+            Attributes("jar", ""), // should come from possible artifact nodes
+            optional = false,
+            transitive = transitive
+          )
+        }
       }
 
   private def publications(node: Node): Map[String, Seq[Publication]] =

core/shared/src/main/scala/coursier/maven/Pom.scala

@@ -53,7 +53,8 @@ object Pom {
         "",
         exclusions.map(mod => (mod.organization, mod.name)).toSet,
         Attributes(typeOpt getOrElse defaultType, classifierOpt getOrElse defaultClassifier),
-        optional
+        optional,
+        transitive = true
       )
   }
 

core/shared/src/main/scala/coursier/package.scala

@@ -13,7 +13,8 @@ package object coursier {
       configuration: String = "",
       attributes: Attributes = Attributes(),
       exclusions: Set[(String, String)] = Set.empty,
-      optional: Boolean = false
+      optional: Boolean = false,
+      transitive: Boolean = true
     ): Dependency =
       core.Dependency(
         module,
@@ -21,7 +22,8 @@ package object coursier {
         configuration,
         exclusions,
         attributes,
-        optional
+        optional,
+        transitive
       )
   }
 

plugin/src/main/scala-2.10/coursier/FromSbt.scala

@@ -47,7 +47,8 @@ object FromSbt {
       exclusions = module.exclusions.map { rule =>
         // FIXME Other `rule` fields are ignored here
         (rule.organization, rule.name)
-      }.toSet
+      }.toSet,
+      transitive = module.isTransitive
     )
 
     val mapping = module.configurations.getOrElse("compile")