1 files changed, 63 insertions, 0 deletions
diff --git a/compiler/src/dotty/tools/dotc/reporting/ConsoleReporter.scala b/compiler/src/dotty/tools/dotc/reporting/ConsoleReporter.scala
new file mode 100644
index 000000000..95f468995
--- /dev/null
+++ b/compiler/src/dotty/tools/dotc/reporting/ConsoleReporter.scala
@@ -0,0 +1,63 @@
+package dotty.tools
+package dotc
+package reporting
+
+import core.Contexts._
+import java.io.{ BufferedReader, PrintWriter }
+import diagnostic.{ Message, MessageContainer }
+import diagnostic.messages.{ Error, Warning, ConditionalWarning }
+
+/**
+  * This class implements a Reporter that displays messages on a text console
+  */
+class ConsoleReporter(
+  reader: BufferedReader = Console.in,
+  writer: PrintWriter = new PrintWriter(Console.err, true)
+) extends Reporter with UniqueMessagePositions with HideNonSensicalMessages with MessageRendering {
+
+  import MessageContainer._
+
+  /** maximal number of error messages to be printed */
+  protected def ErrorLimit = 100
+
+  /** Prints the message. */
+  def printMessage(msg: String): Unit = { writer.print(msg + "\n"); writer.flush() }
+
+  /** Prints the message with the given position indication. */
+  def doReport(m: MessageContainer)(implicit ctx: Context): Unit = {
+    val didPrint = m match {
+      case m: Error =>
+        printMessage(messageAndPos(m.contained, m.pos, diagnosticLevel(m)))
+        if (ctx.settings.prompt.value) displayPrompt()
+        true
+      case m: ConditionalWarning if !m.enablingOption.value =>
+        false
+      case m =>
+        printMessage(messageAndPos(m.contained, m.pos, diagnosticLevel(m)))
+        true
+    }
+
+    if (didPrint && ctx.shouldExplain(m))
+      printMessage(explanation(m.contained))
+    else if (didPrint && m.contained.explanation.nonEmpty)
+      printMessage("\nlonger explanation available when compiling with `-explain`")
+  }
+
+  /** Show prompt if `-Xprompt` is passed as a flag to the compiler */
+  def displayPrompt()(implicit ctx: Context): Unit = {
+    printMessage("\na)bort, s)tack, r)esume: ")
+    flush()
+    if (reader != null) {
+      val response = reader.read().asInstanceOf[Char].toLower
+      if (response == 'a' || response == 's') {
+        Thread.dumpStack()
+        if (response == 'a')
+          sys.exit(1)
+      }
+      print("\n")
+      flush()
+    }
+  }
+
+  override def flush()(implicit ctx: Context): Unit = { writer.flush() }
+}