restore position offset in DelegatingReporter

sbt-bridge/sbt-test/compilerReporter/simple/project/Reporter.scala

@@ -37,8 +37,9 @@ object Reporter {
       val problems = reporter.get.problems
       println(problems.toList)
       assert(problems.size == 2)
+      assert(problems.forall(_.position.offset.isDefined))
       assert(problems.count(_.severity == Severity.Error) == 1) // not found: er1,
       assert(problems.count(_.severity == Severity.Warn) == 1)  // `with' as a type operator has been deprecated; use `&' instead,
     })
   )
-}
+}

sbt-bridge/src/xsbt/DelegatingReporter.scala

@@ -28,13 +28,13 @@ final class DelegatingReporter(delegate: xsbti.Reporter) extends Reporter
       }
 
     val position = new Position {
-      def line: Maybe[Integer] = Maybe.nothing()
-      def lineContent: String = ""
-      def offset: Maybe[Integer] = Maybe.nothing()
-      def pointer: Maybe[Integer] = Maybe.nothing()
-      def pointerSpace: Maybe[String] = Maybe.nothing()
-      def sourceFile: Maybe[java.io.File] = Maybe.nothing()
-      def sourcePath: Maybe[String] = Maybe.nothing()
+      def line: Maybe[Integer] = Maybe.just(cont.pos.line)
+      def lineContent: String = cont.pos.lineContent
+      def offset: Maybe[Integer] = Maybe.just(cont.pos.point)
+      def pointer: Maybe[Integer] = Maybe.just(cont.pos.point)
+      def pointerSpace: Maybe[String] = Maybe.just(" " * cont.pos.point)
+      def sourceFile: Maybe[java.io.File] = maybe(Option(cont.pos.source.file.file))
+      def sourcePath: Maybe[String] = maybe(Option(cont.pos.source.file.file).map(_.getPath))
     }
 
     val sb = new StringBuilder()
@@ -45,4 +45,9 @@ final class DelegatingReporter(delegate: xsbti.Reporter) extends Reporter
 
     delegate.log(position, sb.toString(), severity)
   }
+
+  private[this] def maybe[T](opt: Option[T]): Maybe[T] = opt match { 
+    case None => Maybe.nothing[T]
+    case Some(s) => Maybe.just[T](s)
+  }
 }