could this be cleaner?

endo.scala

def setFromArgs(args: Args): Settings => Settings = {

  val input =
    args optional "input" map { i =>
      { s: Settings => s copy (inputBasePath=InputBasePath(i)) } endo
    } orZero

  val dataCenters =
    (args list "data-centers" some) filterNot { _.isEmpty } map { dcs =>
      { s: Settings => s copy (dataCenters = dcs map DataCenter.apply) } endo
    } orZero

  val lastDays =
    args optional "last-days" map { s =>
      s.parseInt fold
        (sys error "couldn't parse --last-days $s as integer", LastDays)
    } map { lds => { s: Settings => s copy (lastDays=lds) } endo } orZero

  val eventTypes =
    (args list "event-types" some) filterNot { _.isEmpty } map { ets =>
      { s: Settings => s copy (eventTypes = ets map EventType.apply) } endo
    } orZero

  val output =
    args optional "output" map { o =>
      { s: Settings => s copy (outputFilename=OutputFilename(o)) } endo
    } orZero

  input |+| dataCenters |+| lastDays |+| eventTypes |+| output run

}