From 176d1b600e60af77f88537db688bac1553dce134 Mon Sep 17 00:00:00 2001
From: Alistair Johnson <alistair.johnson@johnsonusm.com>
Date: Sun, 2 Oct 2016 20:25:10 +0200
Subject: [PATCH 1/3] Add more artifact overrides

---
 build.sbt                                     |  2 +-
 src/main/scala/scoverage/ScoverageKeys.scala  | 11 +++++
 .../scala/scoverage/ScoverageSbtPlugin.scala  | 42 ++++++++++---------
 version.sbt                                   |  2 +-
 4 files changed, 35 insertions(+), 22 deletions(-)

diff --git a/build.sbt b/build.sbt
index 513a2d46..59511875 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,7 +10,7 @@ resolvers ++= {
   if (isSnapshot.value) Seq(Resolver.sonatypeRepo("snapshots")) else Nil
 }
 
-libraryDependencies += "org.scoverage" %% "scalac-scoverage-plugin" % "1.3.0-SNAPSHOT"
+libraryDependencies += "org.scoverage" %% "scalac-scoverage-plugin" % "1.3.0-RC2"
 
 publishMavenStyle := true
 
diff --git a/src/main/scala/scoverage/ScoverageKeys.scala b/src/main/scala/scoverage/ScoverageKeys.scala
index 52b0b262..1127da63 100644
--- a/src/main/scala/scoverage/ScoverageKeys.scala
+++ b/src/main/scala/scoverage/ScoverageKeys.scala
@@ -17,5 +17,16 @@ object ScoverageKeys {
   lazy val coverageOutputDebug = settingKey[Boolean]("turn on the debug report")
   lazy val coverageCleanSubprojectFiles = settingKey[Boolean]("removes subproject data after an aggregation")
   lazy val coverageOutputTeamCity = settingKey[Boolean]("turn on teamcity reporting")
+
+  // Artifact settings allow the override of default settings for custom applications.
+  // The use of these settings is not advised for regular applications, and most definitely "breaks all warranties"
+  lazy val coverageScalacPluginOrg = settingKey[String]("organisation name of scalac-scoverage-plugin to use")
+  lazy val coverageScalacPluginArtifact = settingKey[String]("artifact name of scalac-scoverage-plugin to use")
   lazy val coverageScalacPluginVersion = settingKey[String]("version of scalac-scoverage-plugin to use")
+  lazy val coverageScalacRuntimeOrg = settingKey[String]("organisation name of scalac-scoverage-runtime to use")
+  lazy val coverageScalacRuntimeArtifact = settingKey[String]("artifact name of scalac-scoverage-runtime to use")
+  lazy val coverageScalacRuntimeVersion = settingKey[String]("version of scalac-scoverage-runtime to use")
+
+  //Use this to completely overide the library settings: This is the last resort option: use this, on you're on your own.
+  lazy val coverageLibraryDependencies = settingKey[Seq[ModuleID]]("Use these library dependencies if coverage is enabled")
 }
diff --git a/src/main/scala/scoverage/ScoverageSbtPlugin.scala b/src/main/scala/scoverage/ScoverageSbtPlugin.scala
index e86bebca..dceea62a 100644
--- a/src/main/scala/scoverage/ScoverageSbtPlugin.scala
+++ b/src/main/scala/scoverage/ScoverageSbtPlugin.scala
@@ -7,11 +7,8 @@ import scoverage.report.{CoverageAggregator, CoberturaXmlWriter, ScoverageHtmlWr
 
 object ScoverageSbtPlugin extends AutoPlugin {
 
-  val OrgScoverage = "org.scoverage"
-  val ScalacRuntimeArtifact = "scalac-scoverage-runtime"
-  val ScalacPluginArtifact = "scalac-scoverage-plugin"
-  // this should match the version defined in build.sbt
-  val DefaultScoverageVersion = "1.3.0-SNAPSHOT"
+  private final val DefaultScoverageVersion = "1.3.0-RC2" // this should match the version defined in build.sbt
+
   val autoImport = ScoverageKeys
   lazy val ScoveragePluginConfig = config("scoveragePlugin").hide
 
@@ -36,7 +33,13 @@ object ScoverageSbtPlugin extends AutoPlugin {
     coverageOutputDebug := false,
     coverageCleanSubprojectFiles := true,
     coverageOutputTeamCity := false,
-    coverageScalacPluginVersion := DefaultScoverageVersion
+    coverageScalacPluginOrg := "org.scoverage",
+    coverageScalacPluginArtifact := "scalac-scoverage-plugin",
+    coverageScalacPluginVersion := DefaultScoverageVersion,
+    coverageScalacRuntimeOrg := coverageScalacPluginOrg.value,
+    coverageScalacRuntimeArtifact := "scalac-scoverage-runtime",
+    coverageScalacRuntimeVersion := coverageScalacPluginVersion.value,
+    coverageLibraryDependencies := Seq()
   )
 
   override def buildSettings: Seq[Setting[_]] = super.buildSettings ++
@@ -54,13 +57,16 @@ object ScoverageSbtPlugin extends AutoPlugin {
   private lazy val coverageSettings = Seq(
     libraryDependencies  ++= {
       if (coverageEnabled.value)
-        Seq(
-          // We only add for "compile"" because of macros. This setting could be optimed to just "test" if the handling
-          // of macro coverage was improved.
-          OrgScoverage %% (scalacRuntime(libraryDependencies.value)) % coverageScalacPluginVersion.value,
-          // We don't want to instrument the test code itself, nor add to a pom when published with coverage enabled.
-          OrgScoverage %% ScalacPluginArtifact % coverageScalacPluginVersion.value % ScoveragePluginConfig.name
-        )
+        if (coverageLibraryDependencies.value.isEmpty)
+          Seq(
+            // We only add for "compile"" because of macros. This setting could be optimed to just "test" if the handling
+            // of macro coverage was improved.
+            coverageScalacRuntimeOrg.value %% (coverageScalacRuntimeArtifact.value + optionalScalaJsSuffix(libraryDependencies.value)) % coverageScalacRuntimeVersion.value,
+            // We don't want to instrument the test code itself, nor add to a pom when published with coverage enabled.
+            coverageScalacPluginOrg.value %% coverageScalacPluginArtifact.value % coverageScalacPluginVersion.value % ScoveragePluginConfig.name
+          )
+        else
+          coverageLibraryDependencies.value
       else
         Nil
     }
@@ -70,8 +76,8 @@ object ScoverageSbtPlugin extends AutoPlugin {
     scalacOptions in(Compile, compile) ++= {
       if (coverageEnabled.value) {
         val scoverageDeps: Seq[File] = update.value matching configurationFilter(ScoveragePluginConfig.name)
-        val pluginPath: File =  scoverageDeps.find(_.getAbsolutePath.contains(ScalacPluginArtifact)) match {
-          case None => throw new Exception(s"Fatal: $ScalacPluginArtifact not in libraryDependencies")
+        val pluginPath: File =  scoverageDeps.find(_.getAbsolutePath.contains(coverageScalacPluginArtifact.value)) match {
+          case None => throw new Exception(s"Fatal: ${coverageScalacPluginArtifact.value} not in libraryDependencies")
           case Some(pluginPath) => pluginPath
         }
         Seq(
@@ -88,12 +94,8 @@ object ScoverageSbtPlugin extends AutoPlugin {
     }
   )
 
-  private def scalacRuntime(deps: Seq[ModuleID]): String = {
-    ScalacRuntimeArtifact + optionalScalaJsSuffix(deps)
-  }
-
   // returns "_sjs$sjsVersion" for Scala.js projects or "" otherwise
-  private def optionalScalaJsSuffix(deps: Seq[ModuleID]): String = {
+  def optionalScalaJsSuffix(deps: Seq[ModuleID]): String = {
     val sjsClassifier = deps.collectFirst{
       case ModuleID("org.scala-js", "scalajs-library", v, _, _, _, _, _, _, _, _) => v
     }.map(_.take(3)).map(sjsVersion => "_sjs" + sjsVersion)
diff --git a/version.sbt b/version.sbt
index 77ab1602..9b4b4add 100644
--- a/version.sbt
+++ b/version.sbt
@@ -1 +1 @@
-version in ThisBuild := "1.5.0-SNAPSHOT"
+version in ThisBuild := "1.5.0-RC2"

From 936f7dc640f80a369d2823d2b9910ab1d2d6fbbf Mon Sep 17 00:00:00 2001
From: Alistair Johnson <alistair.johnson@johnsonusm.com>
Date: Sun, 9 Oct 2016 18:42:42 +0200
Subject: [PATCH 2/3] Use scoverage core

---
 build.sbt                                         | 3 ++-
 src/main/scala/scoverage/ScoverageSbtPlugin.scala | 8 ++++----
 version.sbt                                       | 2 +-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/build.sbt b/build.sbt
index 59511875..19743546 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,7 +10,8 @@ resolvers ++= {
   if (isSnapshot.value) Seq(Resolver.sonatypeRepo("snapshots")) else Nil
 }
 
-libraryDependencies += "org.scoverage" %% "scalac-scoverage-plugin" % "1.3.0-RC2"
+libraryDependencies += "org.scoverage" % "scalac-scoverage-reporting" % "2.0.0-M0"  cross CrossVersion.binary
+libraryDependencies += "org.scoverage" %% "scalac-scoverage-plugin" %  "2.0.0-M0" cross CrossVersion.full
 
 publishMavenStyle := true
 
diff --git a/src/main/scala/scoverage/ScoverageSbtPlugin.scala b/src/main/scala/scoverage/ScoverageSbtPlugin.scala
index dceea62a..6847331a 100644
--- a/src/main/scala/scoverage/ScoverageSbtPlugin.scala
+++ b/src/main/scala/scoverage/ScoverageSbtPlugin.scala
@@ -3,11 +3,11 @@ package scoverage
 import sbt.Keys._
 import sbt._
 import sbt.plugins.JvmPlugin
-import scoverage.report.{CoverageAggregator, CoberturaXmlWriter, ScoverageHtmlWriter, ScoverageXmlWriter}
+import scoverage.report.{CoverageAggregator, CoberturaXmlWriter, Deserializer, ScoverageHtmlWriter, ScoverageXmlWriter}
 
 object ScoverageSbtPlugin extends AutoPlugin {
 
-  private final val DefaultScoverageVersion = "1.3.0-RC2" // this should match the version defined in build.sbt
+  private final val DefaultScoverageVersion = "2.0.0-M0" // this should match the version defined in build.sbt
 
   val autoImport = ScoverageKeys
   lazy val ScoveragePluginConfig = config("scoveragePlugin").hide
@@ -63,7 +63,7 @@ object ScoverageSbtPlugin extends AutoPlugin {
             // of macro coverage was improved.
             coverageScalacRuntimeOrg.value %% (coverageScalacRuntimeArtifact.value + optionalScalaJsSuffix(libraryDependencies.value)) % coverageScalacRuntimeVersion.value,
             // We don't want to instrument the test code itself, nor add to a pom when published with coverage enabled.
-            coverageScalacPluginOrg.value %% coverageScalacPluginArtifact.value % coverageScalacPluginVersion.value % ScoveragePluginConfig.name
+            coverageScalacPluginOrg.value %% coverageScalacPluginArtifact.value % coverageScalacPluginVersion.value % ScoveragePluginConfig.name  cross CrossVersion.full
           )
         else
           coverageLibraryDependencies.value
@@ -230,7 +230,7 @@ object ScoverageSbtPlugin extends AutoPlugin {
 
     if (coverageFile.exists) {
 
-      val coverage = Serializer.deserialize(coverageFile)
+      val coverage = Deserializer.deserialize(coverageFile)
 
       log.info(s"Reading scoverage measurements...")
       val measurementFiles = IOUtils.findMeasurementFiles(dataDir)
diff --git a/version.sbt b/version.sbt
index 9b4b4add..dbba9da7 100644
--- a/version.sbt
+++ b/version.sbt
@@ -1 +1 @@
-version in ThisBuild := "1.5.0-RC2"
+version in ThisBuild := "2.0.0-M0"

From e173a710c9fb649ba8b03c43bb381df146b4f370 Mon Sep 17 00:00:00 2001
From: Alistair Johnson <alistair.johnson@johnsonusm.com>
Date: Sun, 16 Oct 2016 17:50:54 +0200
Subject: [PATCH 3/3] v2.0.0-M0 changes

---
 build.sbt                                     |  3 +-
 patch/kind-projector.diff                     | 28 +++++++
 patch/local-implicits.diff                    | 69 ++++++++++++++++
 patch/notes.txt                               |  4 +
 src/main/resources/Invoker.scala              | 51 ++++++++++++
 src/main/scala/scoverage/ScoverageKeys.scala  |  2 +
 .../scala/scoverage/ScoverageSbtPlugin.scala  | 79 +++++++++++++++++--
 7 files changed, 226 insertions(+), 10 deletions(-)
 create mode 100644 patch/kind-projector.diff
 create mode 100644 patch/local-implicits.diff
 create mode 100644 patch/notes.txt
 create mode 100644 src/main/resources/Invoker.scala

diff --git a/build.sbt b/build.sbt
index 19743546..0beb324e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -10,8 +10,7 @@ resolvers ++= {
   if (isSnapshot.value) Seq(Resolver.sonatypeRepo("snapshots")) else Nil
 }
 
-libraryDependencies += "org.scoverage" % "scalac-scoverage-reporting" % "2.0.0-M0"  cross CrossVersion.binary
-libraryDependencies += "org.scoverage" %% "scalac-scoverage-plugin" %  "2.0.0-M0" cross CrossVersion.full
+libraryDependencies += "org.scoverage" % "scalac-scoverage-reporting" % "2.0.0-M0" cross CrossVersion.binary
 
 publishMavenStyle := true
 
diff --git a/patch/kind-projector.diff b/patch/kind-projector.diff
new file mode 100644
index 00000000..284b9df2
--- /dev/null
+++ b/patch/kind-projector.diff
@@ -0,0 +1,28 @@
+diff --git a/build.sbt b/build.sbt
+index 4c0d07b..49d99d0 100644
+--- a/build.sbt
++++ b/build.sbt
+@@ -34,7 +34,12 @@ List(Compile, Test) flatMap { config =>
+   )
+ }
+ 
+-scalacOptions in Test += "-Xplugin:" + (packageBin in Compile).value
++scalacOptions in Test ++= {
++  val jar = (packageBin in Compile).value
++  Seq(s"-Xplugin:${jar.getAbsolutePath}", s"-Jdummy=${jar.lastModified}") // ensures recompile
++}
++
++coverageIsCompilerPlugin := true
+ 
+ scalacOptions in Test += "-Yrangepos"
+ 
+diff --git a/project/plugins.sbt b/project/plugins.sbt
+index 1bdc94e..54c60eb 100644
+--- a/project/plugins.sbt
++++ b/project/plugins.sbt
+@@ -1,3 +1,5 @@
+ addSbtPlugin("com.jsuereth"      % "sbt-pgp"      % "1.0.0")
+ addSbtPlugin("com.github.gseitz" % "sbt-release"  % "1.0.0")
+ addSbtPlugin("org.xerial.sbt"    % "sbt-sonatype" % "0.5.0")
++
++addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.0-M0")
diff --git a/patch/local-implicits.diff b/patch/local-implicits.diff
new file mode 100644
index 00000000..7edf5af5
--- /dev/null
+++ b/patch/local-implicits.diff
@@ -0,0 +1,69 @@
+diff --git a/build.sbt b/build.sbt
+index c0fa477..e045c79 100644
+--- a/build.sbt
++++ b/build.sbt
+@@ -6,8 +6,8 @@ import ReleaseKeys._
+ organization := "com.github.mpilquist"
+ name := "local-implicits"
+ 
+-scalaVersion := "2.11.5"
+-crossScalaVersions := Seq("2.10.5", "2.11.5")
++scalaVersion := "2.11.8"
++crossScalaVersions := Seq("2.10.6", "2.11.8")
+ crossBuild := true
+ 
+ libraryDependencies ++= Seq(
+@@ -23,6 +23,7 @@ scalacOptions in Test <+= (packageBin in Compile) map {
+   pluginJar => "-Xplugin:" + pluginJar
+ }
+ 
++coverageIsCompilerPlugin := true
+ licenses += ("Three-clause BSD-style", url("https://github.com/mpilquist/local-implicits/blob/master/LICENSE"))
+ publishTo <<= version { v: String =>
+   val nexus = "https://oss.sonatype.org/"
+@@ -58,6 +59,7 @@ pomPostProcess := { (node) =>
+   val stripTestScope = stripIf { n => n.label == "dependency" && (n \ "scope").text == "test" }
+   new RuleTransformer(stripTestScope).transform(node)(0)
+ }
++/*
+ releaseSettings
+ releaseProcess := Seq[ReleaseStep](
+   checkSnapshotDependencies,
+@@ -71,4 +73,4 @@ releaseProcess := Seq[ReleaseStep](
+   commitNextVersion,
+   pushChanges
+ )
+-
++ */
+diff --git a/project/Build.scala b/project/Build.scala
+index 1f08023..b4f5ee2 100644
+--- a/project/Build.scala
++++ b/project/Build.scala
+@@ -5,14 +5,15 @@ import ReleaseStateTransformations._
+ import ReleasePlugin._
+ import ReleaseKeys._
+ import Utilities._
+-import com.typesafe.sbt.SbtPgp.PgpKeys._
++//import com.typesafe.sbt.SbtPgp.PgpKeys._
+ 
+ object ProjectBuild extends Build {
+-
++/*
+   lazy val publishSignedAction = { st: State =>
+     val extracted = st.extract
+     val ref = extracted.get(thisProjectRef)
+     extracted.runAggregated(publishSigned in Global in ref, st)
+   }
++ */
+ }
+ 
+diff --git a/project/plugins.sbt b/project/plugins.sbt
+index 8075941..91ec738 100644
+--- a/project/plugins.sbt
++++ b/project/plugins.sbt
+@@ -1,3 +1,4 @@
+ addSbtPlugin("com.github.gseitz" % "sbt-release" % "0.8.5")
+-addSbtPlugin("com.typesafe.sbt" % "sbt-pgp" % "0.8")
++//addSbtPlugin("com.typesafe.sbt" % "sbt-pgp" % "0.8")
+ 
++addSbtPlugin("org.scoverage" % "sbt-scoverage" % "2.0.0-M0")
diff --git a/patch/notes.txt b/patch/notes.txt
new file mode 100644
index 00000000..b14d80c2
--- /dev/null
+++ b/patch/notes.txt
@@ -0,0 +1,4 @@
+ https://github.com/BennyHill/local-implicits.git
+
+ https://github.com/non/kind-projector.git
+
diff --git a/src/main/resources/Invoker.scala b/src/main/resources/Invoker.scala
new file mode 100644
index 00000000..1a3549e8
--- /dev/null
+++ b/src/main/resources/Invoker.scala
@@ -0,0 +1,51 @@
+package scoverage
+
+import java.io.{File, FileWriter}
+import scala.collection.concurrent.TrieMap
+
+/** @author Stephen Samuel */
+object Invoker {
+
+  private val MeasurementsPrefix = "scoverage.measurements."
+  private val threadFiles = new ThreadLocal[TrieMap[String, FileWriter]]
+  private val ids = TrieMap.empty[(String, Int), Any]
+
+  /**
+   * We record that the given id has been invoked by appending its id to the coverage
+   * data file.
+   *
+   * This will happen concurrently on as many threads as the application is using,
+   * so we use one file per thread, named for the thread id.
+   *
+   * This method is not thread-safe if the threads are in different JVMs, because
+   * the thread IDs may collide.
+   * You may not use `scoverage` on multiple processes in parallel without risking
+   * corruption of the measurement file.
+   *
+   * @param id the id of the statement that was invoked
+   * @param dataDir the directory where the measurement data is held
+   */
+  def invoked(id: Int, dataDir: String): Unit = {
+    // [sam] we can do this simple check to save writing out to a file.
+    // This won't work across JVMs but since there's no harm in writing out the same id multiple
+    // times since for coverage we only care about 1 or more, (it just slows things down to
+    // do it more than once), anything we can do to help is good. This helps especially with code
+    // that is executed many times quickly, eg tight loops.
+    if (!ids.contains((dataDir, id))) {
+      // Each thread writes to a separate measurement file, to reduce contention
+      // and because file appends via FileWriter are not atomic on Windows.
+      var files = threadFiles.get()
+      if (files == null) {
+        files = TrieMap.empty[String, FileWriter]
+        threadFiles.set(files)
+      }
+      val writer = files.getOrElseUpdate(dataDir, new FileWriter(measurementFile(dataDir), true))
+      writer.append(id.toString + '\n').flush()
+
+      ids.put((dataDir, id), ())
+    }
+  }
+
+  def measurementFile(dataDir: File): File = measurementFile(dataDir.getAbsolutePath)
+  def measurementFile(dataDir: String): File = new File(dataDir, MeasurementsPrefix + Thread.currentThread.getId)
+}
diff --git a/src/main/scala/scoverage/ScoverageKeys.scala b/src/main/scala/scoverage/ScoverageKeys.scala
index 1127da63..b5ee31ef 100644
--- a/src/main/scala/scoverage/ScoverageKeys.scala
+++ b/src/main/scala/scoverage/ScoverageKeys.scala
@@ -8,6 +8,7 @@ object ScoverageKeys {
   lazy val coverageAggregate = taskKey[Unit]("aggregate reports from subprojects")
   lazy val coverageExcludedPackages = settingKey[String]("regex for excluded packages")
   lazy val coverageExcludedFiles = settingKey[String]("regex for excluded file paths")
+  lazy val coverageExcludedSymbols = settingKey[String]("regex for excluded symbols")
   lazy val coverageMinimum = settingKey[Double]("scoverage-minimum-coverage")
   lazy val coverageFailOnMinimum = settingKey[Boolean]("if coverage is less than this value then fail build")
   lazy val coverageHighlighting = settingKey[Boolean]("enables range positioning for highlighting")
@@ -17,6 +18,7 @@ object ScoverageKeys {
   lazy val coverageOutputDebug = settingKey[Boolean]("turn on the debug report")
   lazy val coverageCleanSubprojectFiles = settingKey[Boolean]("removes subproject data after an aggregation")
   lazy val coverageOutputTeamCity = settingKey[Boolean]("turn on teamcity reporting")
+  lazy val coverageIsCompilerPlugin = settingKey[Boolean]("True if this project needs compiler plugin support from scoverage")
 
   // Artifact settings allow the override of default settings for custom applications.
   // The use of these settings is not advised for regular applications, and most definitely "breaks all warranties"
diff --git a/src/main/scala/scoverage/ScoverageSbtPlugin.scala b/src/main/scala/scoverage/ScoverageSbtPlugin.scala
index 6847331a..7efa78c7 100644
--- a/src/main/scala/scoverage/ScoverageSbtPlugin.scala
+++ b/src/main/scala/scoverage/ScoverageSbtPlugin.scala
@@ -7,7 +7,8 @@ import scoverage.report.{CoverageAggregator, CoberturaXmlWriter, Deserializer, S
 
 object ScoverageSbtPlugin extends AutoPlugin {
 
-  private final val DefaultScoverageVersion = "2.0.0-M0" // this should match the version defined in build.sbt
+  // this should match the version defined in build.sbt
+  private final val DefaultScoverageVersion = "2.0.0-M0"
 
   val autoImport = ScoverageKeys
   lazy val ScoveragePluginConfig = config("scoveragePlugin").hide
@@ -18,12 +19,14 @@ object ScoverageSbtPlugin extends AutoPlugin {
     inConfigurations(Compile)) // must be outside of the 'coverageAggregate' task (see: https://github.com/sbt/sbt/issues/1095 or https://github.com/sbt/sbt/issues/780)
 
   override def requires: JvmPlugin.type = plugins.JvmPlugin
+
   override def trigger: PluginTrigger = allRequirements
 
   override def globalSettings: Seq[Def.Setting[_]] = super.globalSettings ++ Seq(
     coverageEnabled := false,
     coverageExcludedPackages := "",
     coverageExcludedFiles := "",
+    coverageExcludedSymbols := "",
     coverageMinimum := 0, // default is no minimum
     coverageFailOnMinimum := false,
     coverageHighlighting := true,
@@ -37,9 +40,10 @@ object ScoverageSbtPlugin extends AutoPlugin {
     coverageScalacPluginArtifact := "scalac-scoverage-plugin",
     coverageScalacPluginVersion := DefaultScoverageVersion,
     coverageScalacRuntimeOrg := coverageScalacPluginOrg.value,
-    coverageScalacRuntimeArtifact := "scalac-scoverage-runtime",
+    coverageScalacRuntimeArtifact := "scalac-scoverage-runtime-scala",
     coverageScalacRuntimeVersion := coverageScalacPluginVersion.value,
-    coverageLibraryDependencies := Seq()
+    coverageLibraryDependencies := Seq(),
+    coverageIsCompilerPlugin := false
   )
 
   override def buildSettings: Seq[Setting[_]] = super.buildSettings ++
@@ -52,18 +56,24 @@ object ScoverageSbtPlugin extends AutoPlugin {
     coverageReport <<= coverageReport0,
     coverageAggregate <<= coverageAggregate0,
     aggregate in coverageAggregate := false
+<<<<<<< HEAD
   ) ++ coverageSettings ++ scalacSettings
+=======
+  ) ++ coverageSettings ++ scalacSettings ++ coverageCompilerPluginpSettings
+>>>>>>> v2.0.0-M0 changes
 
   private lazy val coverageSettings = Seq(
-    libraryDependencies  ++= {
+    libraryDependencies ++= {
       if (coverageEnabled.value)
         if (coverageLibraryDependencies.value.isEmpty)
           Seq(
             // We only add for "compile"" because of macros. This setting could be optimed to just "test" if the handling
             // of macro coverage was improved.
             coverageScalacRuntimeOrg.value %% (coverageScalacRuntimeArtifact.value + optionalScalaJsSuffix(libraryDependencies.value)) % coverageScalacRuntimeVersion.value,
+            //coverageScalacRuntimeOrg.value %% coverageScalacRuntimeArtifact.value  % coverageScalacRuntimeVersion.value cross CrossVersion.full,
+
             // We don't want to instrument the test code itself, nor add to a pom when published with coverage enabled.
-            coverageScalacPluginOrg.value %% coverageScalacPluginArtifact.value % coverageScalacPluginVersion.value % ScoveragePluginConfig.name  cross CrossVersion.full
+            coverageScalacPluginOrg.value %% coverageScalacPluginArtifact.value % coverageScalacPluginVersion.value % ScoveragePluginConfig.name cross CrossVersion.full
           )
         else
           coverageLibraryDependencies.value
@@ -72,11 +82,61 @@ object ScoverageSbtPlugin extends AutoPlugin {
     }
   )
 
+  // I've not endeavoured to factor out the SBT repeated code
+  // as we don't know yet that this approach will be adopted. Let's wait for that first
+  // Also, this has been tested on single compiler plugin projects and seems to work.
+  // I have no idea how well it will scala, but if nothing else highlights the problem with on solution.
+  //
+  // The problem is that the scoverage plugin modifies compiled code to call Invoker.invoked,
+  // and hence a library implementing that must be available at the runtime of instrumented code.
+  // In the normal case, this is just a case of adding a runtime library to the test code.
+  //
+  // But, a compiler plugin wil not pick up that library, unless it has a custom loader to do so.
+  // So what I do here is, if coverageIsCompilerPlugin is true, add the Invoker code itself to the
+  // user plugin - that way it most definitely has an invoker to call.
+  //
+  // I think this, if nothing else, makes the problem easier to see.
+  // FTR, similar issues exist with macros and especially macros in scala.js cross compiled
+  // code as actually different invokers are required - a jvm only for runtime and a js one for
+  // runtime. This is another reason why I have excluded scala.js for now, as in the short term
+  // it will just confues issues. Adding it back later is trivial.
+  private lazy val coverageCompilerPluginpSettings = Seq(
+    unmanagedSources in Compile ++= {
+      if (coverageEnabled.value && coverageIsCompilerPlugin.value)
+        mkCpUnmanagedSources(crossTarget.value.toString)
+      else
+        Nil
+    },
+    coverageExcludedPackages := coverageExcludedPackages.value + {
+      if (coverageEnabled.value && coverageIsCompilerPlugin.value) ";scoverage\\..*"
+      else ""
+    },
+    coverageScalacRuntimeArtifact := {
+      if (coverageEnabled.value && coverageIsCompilerPlugin.value) "scalac-scoverage-runtime-java"
+      else coverageScalacRuntimeArtifact.value
+    }
+  )
+
+  private def mkCpUnmanagedSources(target: String) = {
+    import java.nio.file.Files
+
+    val scoverageDir = s"$target/scoverage-data"
+    val invokerFile = "Invoker.scala"
+    val embeddedInvoker = file(s"$scoverageDir/$invokerFile")
+
+    if (!embeddedInvoker.exists()) {
+      val invoker = getClass.getClassLoader.getResourceAsStream(invokerFile)
+      Files.createDirectories(file(s"$scoverageDir").toPath)
+      Files.copy(invoker, embeddedInvoker.toPath)
+    }
+    Seq(embeddedInvoker)
+  }
+
   private lazy val scalacSettings = Seq(
     scalacOptions in(Compile, compile) ++= {
       if (coverageEnabled.value) {
         val scoverageDeps: Seq[File] = update.value matching configurationFilter(ScoveragePluginConfig.name)
-        val pluginPath: File =  scoverageDeps.find(_.getAbsolutePath.contains(coverageScalacPluginArtifact.value)) match {
+        val pluginPath: File = scoverageDeps.find(_.getAbsolutePath.contains(coverageScalacPluginArtifact.value)) match {
           case None => throw new Exception(s"Fatal: ${coverageScalacPluginArtifact.value} not in libraryDependencies")
           case Some(pluginPath) => pluginPath
         }
@@ -85,6 +145,7 @@ object ScoverageSbtPlugin extends AutoPlugin {
           Some(s"-P:scoverage:dataDir:${crossTarget.value.getAbsolutePath}/scoverage-data"),
           Option(coverageExcludedPackages.value.trim).filter(_.nonEmpty).map(v => s"-P:scoverage:excludedPackages:$v"),
           Option(coverageExcludedFiles.value.trim).filter(_.nonEmpty).map(v => s"-P:scoverage:excludedFiles:$v"),
+          Option(coverageExcludedSymbols.value.trim).filter(_.nonEmpty).map(v => s"-P:scoverage:excludedSymbols:$v"),
           // rangepos is broken in some releases of scala so option to turn it off
           if (coverageHighlighting.value) Some("-Yrangepos") else None
         ).flatten
@@ -94,9 +155,12 @@ object ScoverageSbtPlugin extends AutoPlugin {
     }
   )
 
+  def isScalaJsProject(deps: Seq[ModuleID]): Boolean =
+    !optionalScalaJsSuffix(deps).isEmpty
+
   // returns "_sjs$sjsVersion" for Scala.js projects or "" otherwise
   def optionalScalaJsSuffix(deps: Seq[ModuleID]): String = {
-    val sjsClassifier = deps.collectFirst{
+    val sjsClassifier = deps.collectFirst {
       case ModuleID("org.scala-js", "scalajs-library", v, _, _, _, _, _, _, _, _) => v
     }.map(_.take(3)).map(sjsVersion => "_sjs" + sjsVersion)
 
@@ -273,5 +337,4 @@ object ScoverageSbtPlugin extends AutoPlugin {
     val i = scalacOptions.indexOf("-encoding") + 1
     if (i > 0 && i < scalacOptions.length) Some(scalacOptions(i)) else None
   }
-
 }