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package main
import (
"fmt"
"math/rand"
"os"
"regexp"
"strconv"
"time"
)
func usage() {
fmt.Printf("Arguments are in the format [<COUNT>]d<SIZE>[+MOD]\n")
}
func roll(input string) {
parser := regexp.MustCompile("^([0-9]*)d([0-9]+)([+-][0-9]+)?$")
parts := parser.FindStringSubmatch(input)
if len(parts) < 2 {
usage()
return
}
dice, _ := strconv.Atoi(parts[1])
die_size, _ := strconv.Atoi(parts[2])
mod := 0
if len(parts) > 3 {
mod, _ = strconv.Atoi(parts[3])
}
if dice < 1 {
dice = 1
}
total := 0
for i := 0; i < dice; i++ {
v := rand.Intn(die_size) + 1
fmt.Printf("%d+", v)
total += v
}
total += mod
fmt.Printf("%d = %d\n", mod, total)
}
func main() {
rand.Seed(time.Now().UTC().UnixNano())
if len(os.Args) == 1 {
usage()
}
args := os.Args[1:]
for _, arg := range args {
roll(arg)
}
}
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