Centralize dependencies on jline

Code that depends on jline is now in package `scala.tools.nsc.interpreter.jline`.

To make this possible, remove the `entries` functionality from `History`,
and add the `historicize` method. Also provide an overload for `asStrings`.

Clean up a little along the way in `JLineHistory.scala` and `JLineReader.scala`.

Next step: fall back to an embedded jline when the expected jline jar
is not on the classpath.

The gist of the refactor: https://gist.github.com/adriaanm/02e110d4da0a585480c1

1 files changed, 3 insertions, 0 deletions

diff --git a/src/repl/scala/tools/nsc/interpreter/session/History.scala b/src/repl/scala/tools/nsc/interpreter/session/History.scala
index 794d41adc7..2028a13dfd 100644
--- a/src/repl/scala/tools/nsc/interpreter/session/History.scala
+++ b/src/repl/scala/tools/nsc/interpreter/session/History.scala
@@ -11,7 +11,10 @@ package session
  *  reference to the jline classes.  Very sparse right now.
  */
 trait History {
+  def historicize(text: String): Boolean = false
+
   def asStrings: List[String]
+  def asStrings(from: Int, to: Int): List[String] = asStrings.slice(from, to)
   def index: Int
   def size: Int
 }