.

Author: lihaoyi

compiler/src/dotty/tools/repl/Main.scala

@@ -4,5 +4,5 @@ package dotty.tools.repl
 // To test, run bin/scala
 object Main {
   def main(args: Array[String]): Unit =
-    new ReplDriver(args).tryRunning
+    new ReplDriver(args, extraPredef = ReplDriver.pprintImport).tryRunning
 }

compiler/src/dotty/tools/repl/Rendering.scala

@@ -53,8 +53,10 @@ private[repl] class Rendering(parentClassLoader: Option[ClassLoader] = None):
     else str.substring(0, str.offsetByCodePoints(0, maxPrintCharacters - 1))
 
   /** Return a String representation of a value we got from `classLoader()`. */
-  private[repl] def replStringOf(sym: Symbol, value: Object)(using Context): String =
-    dotty.shaded.pprint.PPrinter.BlackWhite.apply(value, height = 50, width = 100).plainText
+  private[repl] def replStringOf(sym: Symbol, value: Object)(using Context): String = {
+    // pretty-print things with 100 cols 50 rows by default,
+    dotty.shaded.pprint.PPrinter.BlackWhite.apply(value, width = 100, height = 50).plainText
+  }
 
   /** Load the value of the symbol using reflection.
    *

compiler/src/dotty/tools/repl/ReplDriver.scala

@@ -77,7 +77,8 @@ case class State(objectIndex: Int,
 /** Main REPL instance, orchestrating input, compilation and presentation */
 class ReplDriver(settings: Array[String],
                  out: PrintStream = Console.out,
-                 classLoader: Option[ClassLoader] = None) extends Driver:
+                 classLoader: Option[ClassLoader] = None,
+                 extraPredef: String = "") extends Driver:
 
   /** Overridden to `false` in order to not have to give sources on the
    *  commandline
@@ -122,10 +123,9 @@ class ReplDriver(settings: Array[String],
   final def initialState: State =
     val emptyState = State(0, 0, Map.empty, Set.empty, false, rootCtx)
     val initScript = rootCtx.settings.replInitScript.value(using rootCtx)
-    val pprintImport = "import dotty.shaded.pprint.pprintln"
     val combinedScript = initScript.trim() match
-      case "" => pprintImport
-      case script => s"$pprintImport\n$script"
+      case "" => extraPredef
+      case script => s"$extraPredef\n$script"
     run(combinedScript)(using emptyState)
 
   /** Reset state of repl to the initial state
@@ -640,3 +640,5 @@ class ReplDriver(settings: Array[String],
     case _                          => ReplConsoleReporter.doReport(dia)(using state.context)
 
 end ReplDriver
+object ReplDriver:
+  def pprintImport = "import dotty.shaded.pprint.pprintln\n"

language-server/src/dotty/tools/languageserver/worksheet/ReplProcess.scala

@@ -4,7 +4,7 @@ import dotty.tools.repl.ReplDriver
 
 object ReplProcess {
   def main(args: Array[String]): Unit = {
-    val driver = new ReplDriver(args)
+    val driver = new ReplDriver(args, extraPredef = ReplDriver.pprintImport)
     val in = new InputStreamConsumer(System.in)
     var state = driver.initialState
 

sbt-bridge/src/xsbt/ConsoleInterface.java

@@ -40,7 +40,7 @@ public void run(
     completeArgsList.add(classpathString);
     String[] completeArgs = completeArgsList.toArray(args);
 
-    ReplDriver driver = new ReplDriver(completeArgs, System.out, Some.apply(loader));
+    ReplDriver driver = new ReplDriver(completeArgs, System.out, Some.apply(loader), ReplDriver.pprintImport());
 
     State state = driver.initialState();
     assert bindNames.length == bindValues.length;