Color REPL

src/repl/scala/tools/nsc/interpreter/ILoop.scala

@@ -445,8 +445,14 @@ class ILoop(in0: Option[BufferedReader], protected val out: JPrintWriter)
   }
 
   private def readOneLine() = {
+    import scala.io.AnsiColor.{ MAGENTA, RESET }
     out.flush()
-    in readLine prompt
+    in readLine (
+      if (in.colorsOk)
+        MAGENTA + prompt + RESET
+      else
+        prompt
+    )
   }
 
   /** The main read-eval-print loop for the repl.  It calls
@@ -857,6 +863,7 @@ class ILoop(in0: Option[BufferedReader], protected val out: JPrintWriter)
       case x: JLineReader => x.consoleReader.postInit
       case _              =>
     }
+    intp.colorsOk = in.colorsOk
   }
   def process(settings: Settings): Boolean = savingContextLoader {
     this.settings = settings

src/repl/scala/tools/nsc/interpreter/IMain.scala

@@ -65,6 +65,7 @@ class IMain(@BeanProperty val factory: ScriptEngineFactory, initialSettings: Set
   // Used in a test case.
   def showDirectory() = replOutput.show(out)
 
+  private[nsc] var colorsOk                   = false     // whether we should use colors in results
   private[nsc] var printResults               = true      // whether to print result lines
   private[nsc] var totalSilence               = false     // whether to print anything
   private var _initializeComplete             = false     // compiler is initialized

src/repl/scala/tools/nsc/interpreter/InteractiveReader.scala

@@ -19,6 +19,7 @@ trait InteractiveReader {
   def history: History
   def completion: Completion
   def redrawLine(): Unit
+  def colorsOk: Boolean
 
   def readYesOrNo(prompt: String, alt: => Boolean): Boolean = readOneKey(prompt) match {
     case 'y'  => true

src/repl/scala/tools/nsc/interpreter/JLineReader.scala

@@ -24,6 +24,8 @@ class JLineReader(_completion: => Completion) extends InteractiveReader {
   private def term = consoleReader.getTerminal()
   def reset() = term.reset()
 
+  lazy val colorsOk = term.isAnsiSupported
+
   def scalaToJline(tc: ScalaCompleter): Completer = new Completer {
     def complete(_buf: String, cursor: Int, candidates: JList[CharSequence]): Int = {
       val buf   = if (_buf == null) "" else _buf

src/repl/scala/tools/nsc/interpreter/MemberHandlers.scala

@@ -119,7 +119,15 @@ trait MemberHandlers {
           if (replProps.vids) s"""" + f"@$${System.identityHashCode($path)}%8x" + """"
           else ""
 
-        """ + "%s%s: %s = " + %s""".format(string2code(prettyName), vidString, string2code(req typeOf name), resultString)
+        import scala.io.AnsiColor.{ BOLD, BLUE, GREEN, RESET }
+
+        def boldColor(c: String, s: String) =
+          if (intp.colorsOk) string2code(BOLD) + string2code(c) + s + string2code(RESET)
+          else s
+
+        val nameString = boldColor(BLUE, string2code(prettyName)) + vidString
+        val typeString = boldColor(GREEN, string2code(req typeOf name))
+        s""" + "$nameString: $typeString = " + $resultString"""
       }
     }
   }

src/repl/scala/tools/nsc/interpreter/SimpleReader.scala

@@ -19,6 +19,7 @@ extends InteractiveReader
 {
   val history = NoHistory
   val completion = NoCompletion
+  val colorsOk = false
 
   def reset() = ()
   def redrawLine() = ()