Scala REPL personalization for internal DSL

Question

On personalizing Scala REPL for internal DSL, from create-your-custom-scala-repl

import scala.tools.nsc.Settings
import scala.tools.nsc.interpreter.ILoop

object TestConsole extends App {
  val settings = new Settings
  settings.usejavacp.value = true
  settings.deprecation.value = true

  new SampleILoop().process(settings)
}

class SampleILoop extends ILoop {
  override def prompt = "myDSL $  "

  addThunk {
    intp.beQuietDuring {
      intp.addImports("my.dsl._")
    }
  }
}

noticed that addThunk is not supported in 2.11.* .

Thus how to load myDSL.jar or import my.dsl._ into a personalized REPL ?

som-snytt · Accepted Answer · 2015-01-02T17:19:50.740

4

You can stick init code in a file, similar to "-i":

import scala.tools.nsc.Settings
import scala.tools.nsc.interpreter.ILoop

object TestConsole extends App {
  val settings = new Settings
  settings.usejavacp.value = true
  settings.deprecation.value = true

  new sys.SystemProperties += ("scala.repl.autoruncode" -> "myrepl.init")

  new SampleILoop().process(settings)
}

class SampleILoop extends ILoop {
  override def prompt = "myDSL $  "
}

Or:

object TestConsole extends App {
  val settings = new Settings
  settings.usejavacp.value = true
  settings.deprecation.value = true

  new sys.SystemProperties += (
    "scala.repl.autoruncode" -> "myrepl.init",
    "scala.shell.prompt" -> "myDSL $ "
  )

  new scala.tools.nsc.interpreter.ILoop process settings
}

edited Jan 02 '15 at 17:19

answered Jan 02 '15 at 17:08

som-snytt

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Many Thanks; how would the contents of `myrepl.init` as a replacement of `intp.addImports("my.dsl._")` ? – elm Jan 02 '15 at 17:44
Each line of the file is run as `intp.interpret`; looks like those autorun commands go in command history. – som-snytt Jan 02 '15 at 18:23
Tried command `scala TestConsole.jar -cp myDSL.jar` ; also in `myrepl.init` added `import my.dsl._` yet could not get DSL related classes... – elm Jan 02 '15 at 18:39
By inserting (terse) DSL code in myrepl.init it works. – elm Jan 02 '15 at 18:57
I also refreshed my memory how to do it with sbt. Use `settings.embeddedDefaults` and don't set `usejavacp`. http://stackoverflow.com/a/25331737/1296806 – som-snytt Jan 02 '15 at 19:09
The "extends App" form only works for me if I compile it and then run it in two steps. Treating this as a script and running directly with "scala" doesn't work for me; I had to replace the "extends App" with an explicitly defined main method. – jbyler Sep 04 '15 at 20:25

Scala REPL personalization for internal DSL

1 Answers1