move helper methods to util

util.go

@@ -0,0 +1,37 @@
+package main
+
+import (
+	"math"
+
+	ui "github.com/gizak/termui"
+)
+
+func byteFormat(n uint64) string {
+	if n < 1024 {
+		return fmt.Sprintf("%sB", strconv.FormatUint(n, 10))
+	}
+	if n < 1048576 {
+		n = n / 1024
+		return fmt.Sprintf("%sK", strconv.FormatUint(n, 10))
+	}
+	if n < 1073741824 {
+		n = n / 1048576
+		return fmt.Sprintf("%sM", strconv.FormatUint(n, 10))
+	}
+	n = n / 1024000000
+	return fmt.Sprintf("%sG", strconv.FormatUint(n, 10))
+}
+
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
+
+func colorScale(n int) ui.Attribute {
+	if n > 70 {
+		return ui.ColorRed
+	}
+	if n > 30 {
+		return ui.ColorYellow
+	}
+	return ui.ColorGreen
+}