scala-swing-repl

gistfile1.sbt

package test

import scala.swing._
import scala.tools.nsc._
import scala.tools.nsc.interpreter._
import java.awt.Dimension
import java.io.{OutputStream, PrintStream}

/**
 * scala-compiler.jar is required
 *
 * TODO: key bind
 * TODO: output with UTF-8
 * TODO: monospace font
 * TODO: support undo
 * TODO: use ScrollPane
 */
object ScalaREPL extends SimpleSwingApplication {
  val settings = new Settings
  settings.usejavacp.value = true
  val input = new TextArea
  val output = new TextArea {
    editable = false
  }
  val main = new IMain(settings)

  System.setOut(new PrintStream(new OutputStream {
    def write(b: Int) {
      // multi byte is not supported
      output.text += String.valueOf(b.toChar)
    }
  }, true))

  def top = new MainFrame { frame =>
    title = "Scala REPL"

    contents = new SplitPane {
      dividerLocation = 300
      topComponent = input
      bottomComponent = output
    }

    menuBar = new MenuBar {
      contents += new Button(Action("Eval") {
        main.interpret(input.text)
      })
      contents += new Button(Action("Clear") {
        output.text = ""
      })
    }

    size = new Dimension(500, 600)
  }
}