add FormatNumber

units.go

@@ -1,11 +1,50 @@
 package proxmoxaas_common_lib
 
-const KiB = 1024
-const MiB = KiB * 1024
-const GiB = MiB * 1024
-const TiB = GiB * 1024
+import (
+	"fmt"
+	"math"
+	"strings"
+)
 
-const KB = 1000
-const MB = KB * 1000
-const GB = MB * 1000
-const TB = GB * 1000
+const Base1000 int64 = 1000
+const Base1024 int64 = 1024
+
+var prefixesBase1000 []string = []string{"", "K", "M", "G", "T"}
+var prefixesBase1024 []string = []string{"", "Ki", "Mi", "Gi", "Ti"}
+
+const KB int64 = Base1000
+const MB int64 = KB * Base1000
+const GB int64 = MB * Base1000
+const TB int64 = GB * Base1000
+
+const KiB int64 = Base1024
+const MiB int64 = KiB * Base1024
+const GiB int64 = MiB * Base1024
+const TiB int64 = GiB * Base1024
+
+func FormatNumber(val int64, base int64) (string, string) {
+	valf := float64(val)
+	basef := float64(base)
+	steps := 0
+	for math.Abs(valf) > basef && steps < 4 {
+		valf /= basef
+		steps++
+	}
+
+	switch base {
+	case Base1000:
+		s := fmt.Sprintf("%.4f", valf)
+		s = strings.TrimRight(s, "0")
+		s = strings.TrimRight(s, ".")
+		prefixes := prefixesBase1000
+		return s, prefixes[steps]
+	case Base1024:
+		s := fmt.Sprintf("%.4f", valf)
+		s = strings.TrimRight(s, "0")
+		s = strings.TrimRight(s, ".")
+		prefixes := prefixesBase1024
+		return s, prefixes[steps]
+	default:
+		return "0", ""
+	}
+}