Set default artifact type to JAR from sbt plugin

Even if the packaging attribute of the dependency says the packaging is different (e.g. pom), this makes the plugin try to get a JAR anyway.

Fixes https://github.com/alexarchambault/coursier/issues/278

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

@@ -12,6 +12,7 @@ object CoursierPlugin extends AutoPlugin {
   object autoImport {
     val coursierParallelDownloads = Keys.coursierParallelDownloads
     val coursierMaxIterations = Keys.coursierMaxIterations
+    val coursierDefaultArtifactType = Keys.coursierDefaultArtifactType
     val coursierChecksums = Keys.coursierChecksums
     val coursierArtifactsChecksums = Keys.coursierArtifactsChecksums
     val coursierCachePolicies = Keys.coursierCachePolicies
@@ -57,6 +58,7 @@ object CoursierPlugin extends AutoPlugin {
   override lazy val projectSettings = Seq(
     coursierParallelDownloads := 6,
     coursierMaxIterations := 50,
+    coursierDefaultArtifactType := "jar",
     coursierChecksums := Seq(Some("SHA-1"), None),
     coursierArtifactsChecksums := Seq(None),
     coursierCachePolicies := CachePolicy.default,

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

@@ -52,7 +52,8 @@ object FromSbt {
   def dependencies(
     module: ModuleID,
     scalaVersion: String,
-    scalaBinaryVersion: String
+    scalaBinaryVersion: String,
+    defaultArtifactType: String
   ): Seq[(String, Dependency)] = {
 
     // TODO Warn about unsupported properties in `module`
@@ -74,7 +75,7 @@ object FromSbt {
 
     val attributes =
       if (module.explicitArtifacts.isEmpty)
-        Seq(Attributes())
+        Seq(Attributes(defaultArtifactType, ""))
       else
         module.explicitArtifacts.map { a =>
           Attributes(`type` = a.extension, classifier = a.classifier.getOrElse(""))
@@ -105,14 +106,15 @@ object FromSbt {
     allDependencies: Seq[ModuleID],
     ivyConfigurations: Map[String, Seq[String]],
     scalaVersion: String,
-    scalaBinaryVersion: String
+    scalaBinaryVersion: String,
+    defaultArtifactType: String
   ): Project = {
 
     // FIXME Ignored for now - easy to support though
     // val sbtDepOverrides = dependencyOverrides.value
     // val sbtExclusions = excludeDependencies.value
 
-    val deps = allDependencies.flatMap(dependencies(_, scalaVersion, scalaBinaryVersion))
+    val deps = allDependencies.flatMap(dependencies(_, scalaVersion, scalaBinaryVersion, defaultArtifactType))
 
     Project(
       Module(

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

@@ -12,6 +12,7 @@ import scala.concurrent.duration.Duration
 object Keys {
   val coursierParallelDownloads = SettingKey[Int]("coursier-parallel-downloads")
   val coursierMaxIterations = SettingKey[Int]("coursier-max-iterations")
+  val coursierDefaultArtifactType = SettingKey[String]("coursier-default-artifact-type")
   val coursierChecksums = SettingKey[Seq[Option[String]]]("coursier-checksums")
   val coursierArtifactsChecksums = SettingKey[Seq[Option[String]]]("coursier-artifacts-checksums")
   val coursierCachePolicies = SettingKey[Seq[CachePolicy]]("coursier-cache-policies")

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

@@ -76,16 +76,22 @@ object Tasks {
 
       val allDependenciesTask = allDependencies.in(projectRef).get(state)
 
+      lazy val projId = projectID.in(projectRef).get(state)
+      lazy val sv = scalaVersion.in(projectRef).get(state)
+      lazy val sbv = scalaBinaryVersion.in(projectRef).get(state)
+      lazy val defaultArtifactType = coursierDefaultArtifactType.in(projectRef).get(state)
+
       for {
         allDependencies <- allDependenciesTask
       } yield {
 
         FromSbt.project(
-          projectID.in(projectRef).get(state),
+          projId,
           allDependencies,
           configurations.map { cfg => cfg.name -> cfg.extendsConfigs.map(_.name) }.toMap,
-          scalaVersion.in(projectRef).get(state),
+          sv,
-          scalaBinaryVersion.in(projectRef).get(state)
+          sbv,
+          defaultArtifactType
         )
       }
     }
@@ -240,13 +246,15 @@ object Tasks {
         if (sbtClassifiers) {
           val sv = scalaVersion.value
           val sbv = scalaBinaryVersion.value
+          val defaultArtifactType = coursierDefaultArtifactType.value
 
           val proj = FromSbt.project(
             cm.id,
             cm.modules,
             cm.configurations.map(cfg => cfg.name -> cfg.extendsConfigs.map(_.name)).toMap,
             sv,
-            sbv
+            sbv,
+            defaultArtifactType
           )
 
           val fallbackDeps = FromSbt.fallbackDependencies(
@@ -587,13 +595,15 @@ object Tasks {
         if (sbtClassifiers) {
           val sv = scalaVersion.value
           val sbv = scalaBinaryVersion.value
+          val defaultArtifactType = coursierDefaultArtifactType.value
 
           FromSbt.project(
             cm.id,
             cm.modules,
             cm.configurations.map(cfg => cfg.name -> cfg.extendsConfigs.map(_.name)).toMap,
             sv,
-            sbv
+            sbv,
+            defaultArtifactType
           )
         } else {
           val proj = coursierProject.value
@@ -800,13 +810,15 @@ object Tasks {
         val cm = coursierSbtClassifiersModule.value
         val sv = scalaVersion.value
         val sbv = scalaBinaryVersion.value
+        val defaultArtifactType = coursierDefaultArtifactType.value
 
         FromSbt.project(
           cm.id,
           cm.modules,
           cm.configurations.map(cfg => cfg.name -> cfg.extendsConfigs.map(_.name)).toMap,
           sv,
-          sbv
+          sbv,
+          defaultArtifactType
         )
       } else {
         val proj = coursierProject.value

plugin/src/sbt-test/sbt-coursier/zookeeper/build.sbt

@@ -0,0 +1,10 @@
+scalaVersion := "2.11.8"
+
+libraryDependencies += "org.apache.zookeeper" % "zookeeper" % "3.5.0-alpha"
+
+coursierCachePolicies := {
+  if (sys.props("os.name").startsWith("Windows"))
+    coursierCachePolicies.value
+  else
+    Seq(coursier.CachePolicy.ForceDownload)
+}

plugin/src/sbt-test/sbt-coursier/zookeeper/project/plugins.sbt

@@ -0,0 +1,11 @@
+{
+  val pluginVersion = sys.props.getOrElse(
+    "plugin.version",
+    throw new RuntimeException(
+      """|The system property 'plugin.version' is not defined.
+         |Specify this property using the scriptedLaunchOpts -D.""".stripMargin
+    )
+  )
+
+  addSbtPlugin("io.get-coursier" % "sbt-coursier" % pluginVersion)
+}

plugin/src/sbt-test/sbt-coursier/zookeeper/src/main/scala/Main.scala

@@ -0,0 +1,8 @@
+import java.io.File
+import java.nio.file.Files
+
+import org.apache.zookeeper.ZooKeeper
+
+object Main extends App {
+  Files.write(new File("output").toPath, classOf[ZooKeeper].getSimpleName.getBytes("UTF-8"))
+}

plugin/src/sbt-test/sbt-coursier/zookeeper/test

@@ -0,0 +1,3 @@
+$ delete output
+> run
+$ exists output