1 files changed, 35 insertions, 0 deletions
diff --git a/Scala/recfun/project/RecordingLogger.scala b/Scala/recfun/project/RecordingLogger.scala
new file mode 100644
index 0000000..b886768
--- /dev/null
+++ b/Scala/recfun/project/RecordingLogger.scala
@@ -0,0 +1,35 @@
+import sbt._
+import collection.mutable.ListBuffer
+
+/**
+ * Logger to capture compiler output, test output
+ */
+
+object RecordingLogger extends Logger {
+  private val buffer = ListBuffer[String]()
+
+  def hasErrors = buffer.nonEmpty
+
+  def readAndClear() = {
+    val res = buffer.mkString("\n")
+    buffer.clear()
+    res
+  }
+
+  def clear() {
+    buffer.clear()
+  }
+
+  def log(level: Level.Value, message: => String) =
+    if (level == Level.Error) {
+      buffer += message
+    }
+
+  // we don't log success here
+  def success(message: => String) = ()
+
+  // invoked when a task throws an exception. invoked late, when the exception is logged, i.e.
+  // just before returning to the prompt. therefore we do nothing: storing the exception in the
+  // buffer would happen *after* the `handleFailure` reads the buffer.
+  def trace(t: => Throwable) = ()
+}