gistfile1.txt

package interpolate

import rapture.json._
import jsonBackends.jawn._

object Interpolation {
  
  case class Forced(json: Json)
  implicit def toForced[T: JsonSerializer](t: T): Forced = Forced(Json(t))

  implicit class Interpolator(sc: StringContext) {
    def interpolate(parts: Forced*): Json = {
      // just maps the fixed parts of the string to the variable bits that come after, ignoring the last
      Json((sc.parts.map(_.trim) zip parts.map(_.json)).toMap)
    }
  }
}

object Test {
  import Interpolation._
  val json = interpolate"""
    foo ${ 42 }
    bar ${ "Hello world!" }
  """
}

Thanks for the example, it works, though it's a bit constraining anyway. I'm wondering if a macro would do the trick here...