refactor compact widgets into subpackage

widgets/util.go

@@ -1,9 +1,48 @@
 package widgets
 
 import (
+	"fmt"
+	"math"
+	"strconv"
+
 	ui "github.com/gizak/termui"
 )
 
+const (
+	kb = 1024
+	mb = kb * 1024
+	gb = mb * 1024
+)
+
+func byteFormat(n int64) string {
+	if n < kb {
+		return fmt.Sprintf("%sB", strconv.FormatInt(n, 10))
+	}
+	if n < mb {
+		n = n / kb
+		return fmt.Sprintf("%sK", strconv.FormatInt(n, 10))
+	}
+	if n < gb {
+		n = n / mb
+		return fmt.Sprintf("%sM", strconv.FormatInt(n, 10))
+	}
+	n = n / gb
+	return fmt.Sprintf("%sG", strconv.FormatInt(n, 10))
+}
+
+func round(num float64) int {
+	return int(num + math.Copysign(0.5, num))
+}
+
+func compactPar(s string) *ui.Par {
+	p := ui.NewPar(s)
+	p.Border = false
+	p.Height = 1
+	p.Width = 20
+	p.TextFgColor = ui.ColorWhite
+	return p
+}
+
 func mkGauge() *ui.Gauge {
 	g := ui.NewGauge()
 	g.Height = 1