Initial QSfera import

Server/vendor/github.com/gookit/goutil/mathutil/random.go

@@ -0,0 +1,37 @@
+package mathutil
+
+import (
+	"math/rand"
+	"time"
+)
+
+// RandomInt return a random int at the [min, max)
+//
+// Usage:
+//
+//	RandomInt(10, 99)
+//	RandomInt(100, 999)
+//	RandomInt(1000, 9999)
+func RandomInt(min, max int) int {
+	rr := rand.New(rand.NewSource(time.Now().UnixNano()))
+	return min + rr.Intn(max-min)
+}
+
+// RandInt alias of RandomInt()
+func RandInt(min, max int) int { return RandomInt(min, max) }
+
+// RandIntWithSeed alias of RandomIntWithSeed()
+func RandIntWithSeed(min, max int, seed int64) int {
+	return RandomIntWithSeed(min, max, seed)
+}
+
+// RandomIntWithSeed return a random int at the [min, max)
+//
+// Usage:
+//
+//	seed := time.Now().UnixNano()
+//	RandomIntWithSeed(1000, 9999, seed)
+func RandomIntWithSeed(min, max int, seed int64) int {
+	rr := rand.New(rand.NewSource(seed))
+	return min + rr.Intn(max-min)
+}