1 files changed, 97 insertions, 0 deletions
diff --git a/main/api/src/mill/api/BuildReporter.scala b/main/api/src/mill/api/BuildReporter.scala
new file mode 100644
index 00000000..2b360a45
--- /dev/null
+++ b/main/api/src/mill/api/BuildReporter.scala
@@ -0,0 +1,97 @@
+package mill.api
+
+import java.io.File
+
+import sbt.testing.Event
+
+/**
+  * Test reporter class that can be
+  * injected into the test task and
+  * report information upon the start
+  * and the finish of testing events
+  */
+trait TestReporter {
+  def logStart(event: Event): Unit
+
+  def logFinish(event: Event): Unit
+
+
+}
+
+/**
+  * Dummy Test Reporter that doesn't report
+  * anything for any testing event.
+  */
+object  DummyTestReporter extends TestReporter {
+  override def logStart(event:  Event): Unit = {
+
+  }
+  override def logFinish(event:  Event): Unit = {
+
+  }
+}
+
+/**
+  * A listener trait for getting notified about
+  * build output like compiler warnings and errors
+  */
+trait BuildProblemReporter {
+  def logError(problem: Problem): Unit
+
+  def logWarning(problem: Problem): Unit
+
+  def logInfo(problem: Problem): Unit
+
+  def printSummary(): Unit
+}
+
+/**
+  * Contains general information about the build problem
+  */
+trait Problem {
+  def category: String
+
+  def severity: Severity
+
+  def message: String
+
+  def position: ProblemPosition
+}
+
+/**
+  * Indicates the exact location (source file, line, column) of the build problem
+  */
+trait ProblemPosition {
+  def line: Option[Int]
+
+  def lineContent: String
+
+  def offset: Option[Int]
+
+  def pointer: Option[Int]
+
+  def pointerSpace: Option[String]
+
+  def sourcePath: Option[String]
+
+  def sourceFile: Option[File]
+
+  def startOffset: Option[Int] = Option.empty
+
+  def endOffset: Option[Int] = Option.empty
+
+  def startLine: Option[Int] = Option.empty
+
+  def startColumn: Option[Int] = Option.empty
+
+  def endLine: Option[Int] = Option.empty
+
+  def endColumn: Option[Int] = Option.empty
+}
+
+sealed trait Severity
+case object Info extends Severity
+case object Error extends Severity
+case object Warn extends Severity
+
+