ScalafmtSbtReporter: mention scalafmt in messages

Author: Albert Meltzer

Diff for: plugin/src/main/scala/org/scalafmt/sbt/ScalafmtPlugin.scala

@@ -9,6 +9,7 @@ import sbt.librarymanagement.MavenRepository
 import sbt.util.CacheImplicits._
 import sbt.util.CacheStoreFactory
 import sbt.util.FileInfo
+import sbt.util.Level
 
 import scala.util.Failure
 import scala.util.Success
@@ -113,6 +114,13 @@ object ScalafmtPlugin extends AutoPlugin {
     val diffRefPrefix = "diff-ref="
   }
 
+  private class ScalafmtLogger(log: Logger) extends Logger {
+    override def trace(t: => Throwable): Unit = log.trace(t)
+    override def success(message: => String): Unit = success(message)
+    override def log(level: Level.Value, message: => String): Unit =
+      log.log(level, "scalafmt: " + message)
+  }
+
   private class FormatSession(
       config: Path,
       taskStreams: TaskStreams,

Diff for: plugin/src/main/scala/org/scalafmt/sbt/ScalafmtSbtReporter.scala

@@ -25,6 +25,7 @@ class ScalafmtSbtReporter(
   override def error(file: Path, message: String, e: Throwable): Unit = {
     def getMessage() = {
       val res = new StringWriter()
+      res.write("scalafmt: ")
       res.write(Option(message).getOrElse("failed"))
       res.write(" [")
       res.write(file.toString)