scala date time dsl

1. sudo sh -c '(echo "#!/usr/bin/env sh" && curl -L https://github.com/lihaoyi/Ammonite/releases/download/2.0.4/2.13-2.0.4) > /usr/local/bin/amm && chmod +x /usr/local/bin/amm' && amm
2. create file:

val scalaLangVersion = "2.11"
val scalaLibVersion = "2.11.8"
import $ivy.`org.scala-lang:scala-compiler:2.11.8`
import $ivy.`org.scalaj:scalaj-time_2.11:0.8`
import scala.util.{Failure, Success, Try}
import org.joda.time._

object DateTimeOps {

  /**
   * Helper for evaluating joda DateTime from strings
   * Uses https://github.com/jorgeortiz85/scala-time wrapper around joda date-time library
   * Some examples:
   * - now: "DateTime.now"
   * - relative date: "DateTime.now - 2.days"
   * - exact date (uses DateTime.parse): "2020-01-01T00:00:00"
   *
   * @param dateTimeString
   */
  implicit class DateTimeStringOps(dateTimeString: String) {

    import scala.reflect.runtime.universe
    import scala.tools.reflect.ToolBox

    val toolBox = universe.runtimeMirror(getClass.getClassLoader).mkToolBox()

    private def evalSheet(expression: String): String =
      s"""
    import org.scala_tools.time.Imports._
    $expression
    """

    def asDateTime: DateTime = Try(DateTime.parse(dateTimeString)) match {
      case Success(value) => value
      case Failure(_) => toolBox.eval(toolBox.parse(evalSheet(dateTimeString))).asInstanceOf[org.joda.time.DateTime]
    }
  }

}

import DateTimeOps._
println("DateTime.now - 2.days".asDateTime)

3. run: amm scala-date-time-dsl.sc