Add unique-mode for dice

Signed-off-by: Knut Ahlers <knut@ahlers.me>

dice/main.go

@@ -24,6 +24,7 @@ var (
 		Sides          int64  `flag:"sides,s" default:"6" description:"How many sides does the dice have?"`
 		Template       string `flag:"template" vardefault:"tpl" description:"Template to format the result with"`
 		Type           string `flag:"type,t" default:"dice" description:"What to throw (coin, dice)"`
+		Unique         bool   `flag:"unique,u" default:"false" description:"Cannot roll the same number twice"`
 		VersionAndExit bool   `flag:"version" default:"false" description:"Prints current version and exits"`
 	}{}
 
@@ -115,14 +116,28 @@ func main() {
 	}
 }
 
+func containsNum(s []int64, n int64) bool {
+	for _, sn := range s {
+		if sn == n {
+			return true
+		}
+	}
+	return false
+}
+
 func getRandomNumber(sides int64) int64 {
 	n, _ := rand.Int(rand.Reader, big.NewInt(sides))
 	return n.Int64()
 }
 
 func getResults(sides, count int64) (res []int64, sum int64) {
-	for i := int64(0); i < count; i++ {
+	for len(res) < int(count) {
 		v := getRandomNumber(sides) + 1
+
+		if cfg.Unique && containsNum(res, v) {
+			continue
+		}
+
 		res = append(res, v)
 		sum += v
 	}