Support jline in the interactive shell.

1 files changed, 32 insertions, 0 deletions

diff --git a/src/compiler/scala/tools/nsc/interpreter/InteractiveReader.scala b/src/compiler/scala/tools/nsc/interpreter/InteractiveReader.scala
new file mode 100644
index 0000000000..eb3c475d26
--- /dev/null
+++ b/src/compiler/scala/tools/nsc/interpreter/InteractiveReader.scala
@@ -0,0 +1,32 @@
+/* NSC -- new Scala compiler
+ * Copyright 2005-2007 LAMP/EPFL
+ * @author Stepan Koltsov
+ */
+// $Id$
+
+package scala.tools.nsc.interpreter
+
+/** Reads lines from an input stream */
+trait InteractiveReader {
+  def readLine(prompt: String): String
+  val interactive: Boolean
+}
+
+
+
+object InteractiveReader {
+  /** Create an interactive reader.  Uses JLine if the
+   *  library is available, but otherwise uses a
+   *  SimpleReader. */
+  def createDefault(): InteractiveReader = {
+    try {
+      new JlineReader
+    } catch {
+      case e =>
+        //out.println("jline is not available: " + e) //debug
+	new SimpleReader()
+    }
+  }
+
+
+}