IOSP

IOSP.kt

fun main(args: Array<String>) {
    errorHandled {
        inCase(args.isEmpty(),
            onEmpty = {
                val peers = sortedPeers()
                show(peers)
            },
            onNonEmpty = {
                updatePeer(args)
                val peers = sortedPeers()
                show(peers)
            }
        )
    }
}

private fun errorHandled(fn: () -> Unit) {
    try {
        fn()
    } catch (e: PeerNotFoundException) {
        println("Sorry, couldn't find '${e.firstName}'")
    } catch (e: MultipleEntriesFoundException) {
        println("Multiple entries found for '${e.firstName}'. Please also provide last name.")
    }
}

private fun inCase(argsAreEmpty: Boolean, onEmpty: () -> Unit, onNonEmpty: () -> Unit) {
    when (argsAreEmpty) {
        true -> onEmpty()
        else -> onNonEmpty()
    }
}