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• case-app-cats-effect-2_2.13
• 2.1.0-M29
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• package.scala

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caseapp.catseffect.package.scala Maven / Gradle / Ivy

package caseapp

import caseapp.core.argparser.{AccumulatorArgParser, ArgParser}
import cats.data.NonEmptyList

package object catseffect {
  implicit def nonEmptyListArgParser[T](
    implicit parser: ArgParser[T]
  ): AccumulatorArgParser[NonEmptyList[T]] =
    AccumulatorArgParser.from(parser.description + "*") { (prevOpt, idx, span, s) =>
      parser(None, idx, span, s).map { t =>
        // inefficient for big lists
        prevOpt.fold(NonEmptyList.one(t))(_ :+ t)
      }
    }
}