initial import

core/utils/version.go

@@ -0,0 +1,37 @@
+package utils
+
+import (
+	"strconv"
+	"strings"
+)
+
+// returns -1 if the first version is lower than the second, 0 if they are equal, and 1 if the second is lower.
+func CompareVersions(a, b string) int {
+	as := strings.Split(a, ".")
+	bs := strings.Split(b, ".")
+	var loop int
+	if len(as) > len(bs) {
+		loop = len(as)
+	} else {
+		loop = len(bs)
+	}
+
+	for i := 0; i < loop; i++ {
+		var x, y string
+		if len(as) > i {
+			x = as[i]
+		}
+		if len(bs) > i {
+			y = bs[i]
+		}
+		xi, _ := strconv.Atoi(x)
+		yi, _ := strconv.Atoi(y)
+		if xi > yi {
+			return 1
+		} else if xi < yi {
+			return -1
+		}
+	}
+
+	return 0
+}