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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
package interpreter
import scala.tools.jline.console.{ ConsoleReader, CursorBuffer }
import scala.tools.jline.console.completer.CompletionHandler
import Completion._
trait ConsoleReaderHelper extends ConsoleReader {
def currentLine = "" + getCursorBuffer.buffer
def currentPos = getCursorBuffer.cursor
def terminal = getTerminal()
def width = terminal.getWidth()
def height = terminal.getHeight()
def paginate = isPaginationEnabled()
def paginate_=(value: Boolean) = setPaginationEnabled(value)
def goBack(num: Int): Unit
def readOneKey(prompt: String): Int
def eraseLine(): Unit
private val marginSize = 3
private def morePrompt = "--More--"
private def emulateMore(): Int = {
val key = readOneKey(morePrompt)
try key match {
case '\r' | '\n' => 1
case 'q' => -1
case _ => height - 1
}
finally {
eraseLine()
// TODO: still not quite managing to erase --More-- and get
// back to a scala prompt without another keypress.
if (key == 'q') {
putString(getPrompt())
redrawLine()
flush()
}
}
}
override def printColumns(items: JCollection[_ <: CharSequence]): Unit =
printColumns(items: List[String])
def printColumns(items: List[String]): Unit = {
if (items forall (_ == ""))
return
val longest = items map (_.length) max
var linesLeft = if (isPaginationEnabled()) height - 1 else Int.MaxValue
val columnSize = longest + marginSize
val padded = items map ("%-" + columnSize + "s" format _)
val groupSize = 1 max (width / columnSize) // make sure it doesn't divide to 0
padded grouped groupSize foreach { xs =>
println(xs.mkString)
linesLeft -= 1
if (linesLeft <= 0) {
linesLeft = emulateMore()
if (linesLeft < 0)
return
}
}
}
}
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