Helper to pretty print scala Duration

PrettyDuration.scala

package com.intenthq.elasticsearchwriter.duration

import java.util.Locale
import java.util.concurrent.TimeUnit

import scala.concurrent.duration._

object PrettyDuration {
  private val abbreviate = Map(
    NANOSECONDS -> "ns",
    MICROSECONDS -> "μs",
    MILLISECONDS -> "ms",
    SECONDS -> "s",
    MINUTES -> "min",
    HOURS -> "h",
    DAYS -> "d"
  )

  private val units = TimeUnit.values.reverse

  implicit class PrettyPrintableDuration(duration: Duration) {
    def pretty: String = pretty()
    def pretty(precision: Int = 4): String = duration match {
      case d: FiniteDuration =>
        val chosenUnit = units.find(_.convert(d.length, d.unit) > 0).getOrElse(NANOSECONDS)
        val value = d.toUnit(chosenUnit)
        s"%.${precision}g %s".formatLocal(Locale.ROOT, value, abbreviate(chosenUnit))
      case Duration.MinusInf => s"-∞ (minus infinity)"
      case Duration.Inf      => s"∞ (infinity)"
      case _                 => s"undefined"
    }

  }

}