dice-roller/main.go

package main

import (
	"flag"
	"fmt"
	"math/rand"
	"time"
)

func main() {
	var surfaces, modifier, diceThrows int
	rand.Seed(time.Now().Unix())
	flag.IntVar(&surfaces, "s", 20, "Specify amount of die surfaces")
	flag.IntVar(&diceThrows, "t", 1, "Specify dice diceThrows")
	flag.IntVar(&modifier, "m", 0, "Stat modifier")
	flag.Parse()
	total := Cast(surfaces, diceThrows)
	if modifier != 0 {
		fmt.Println("Without modifier:", total)
		fmt.Println("With modifier:", total+modifier)
	} else {
		fmt.Println(total)
	}
}

func Cast(dieSurfaces, castAmount int) int {
	var (
		casts       []int
		cast, total int
	)

	for i := 0; i < castAmount; i++ {
		cast = rand.Intn(dieSurfaces) + 1
		casts = append(casts, cast)
		total += cast
	}

	if castAmount > 1 {
		fmt.Println(casts)
	}
	return total
}