OttoBot/src/main/kotlin/nl/voidcorp/dbot/Util.kt

package nl.voidcorp.dbot

import com.google.gson.Gson
import com.google.gson.GsonBuilder
import com.jagrosh.jdautilities.command.Command
import java.util.*

val gson: Gson = GsonBuilder().setPrettyPrinting().create()

val random = Random()

fun <E> MutableList<E>.addAll(vararg e: E) = this.addAll(listOf(*e))

fun <E> List<E>.random(): E = this[random.nextInt(this.size)]

fun List<Command>.catMap(): Map<String, List<Command>> {
    val m = mutableMapOf<String, MutableList<Command>>()
    for (c in this) {
        val cname = if (c.category == null) "Unknown" else c.category.name
        if (!m.containsKey(cname)) {
            m[cname] = mutableListOf()
        }

        m[cname]!! += c
    }
    return m
}

fun String.emptyOr(other: String): String = if (this.isEmpty()) other else this