Add support for excludeDependencies in SBT plugin

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

@@ -259,6 +259,24 @@ object Tasks {
         FromSbt.moduleVersion(_, sv, sbv)
       ).toMap
 
+      var anyNonSupportedExclusionRule = false
+      val exclusions = excludeDependencies.value.flatMap {
+        rule =>
+          if (
+            rule.artifact != "*" ||
+              rule.configurations.nonEmpty ||
+              rule.crossVersion != sbt.CrossVersion.Disabled
+          ) {
+            Console.err.println(s"Warning: unsupported exclusion rule $rule")
+            anyNonSupportedExclusionRule = true
+            Nil
+          } else
+            Seq((rule.organization, rule.name))
+      }.toSet
+
+      if (anyNonSupportedExclusionRule)
+        Console.err.println(s"Only supported exclusion rule fields: organization, name")
+
       val resolvers =
         if (sbtClassifiers)
           coursierSbtResolvers.value
@@ -269,7 +287,10 @@ object Tasks {
 
 
       val startRes = Resolution(
-        currentProject.dependencies.map { case (_, dep) => dep }.toSet,
+        currentProject.dependencies.map {
+          case (_, dep) =>
+            dep.copy(exclusions = dep.exclusions ++ exclusions)
+        }.toSet,
         filter = Some(dep => !dep.optional),
         forceVersions = userForceVersions ++ forcedScalaModules(sv) ++ projects.map(_.moduleVersion)
       )

plugin/src/sbt-test/sbt-coursier/exclude-dependencies/build.sbt

@@ -0,0 +1,5 @@
+scalaVersion := "2.11.8"
+
+libraryDependencies += "com.github.alexarchambault" %% "argonaut-shapeless_6.1" % "1.0.0-RC1"
+
+excludeDependencies += SbtExclusionRule("com.chuusai", "shapeless_2.11")

plugin/src/sbt-test/sbt-coursier/exclude-dependencies/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/exclude-dependencies/src/main/scala/Main.scala

@@ -0,0 +1,21 @@
+import java.io.File
+import java.nio.file.Files
+
+import scala.util.Try
+
+object Main extends App {
+
+  def classFound(clsName: String) = Try(
+    Thread.currentThread()
+      .getContextClassLoader()
+      .loadClass(clsName)
+  ).toOption.nonEmpty
+
+  val shapelessFound = classFound("shapeless.HList")
+  val argonautShapelessFound = classFound("argonaut.derive.MkEncodeJson")
+
+  assert(argonautShapelessFound)
+  assert(!shapelessFound)
+
+  Files.write(new File("output").toPath, "OK".getBytes("UTF-8"))
+}

plugin/src/sbt-test/sbt-coursier/exclude-dependencies/test

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