move helper methods to util

widgets.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+
+	"github.com/fsouza/go-dockerclient"
+	ui "github.com/gizak/termui"
+)
+
+type CpuCalc struct {
+	lastCpu    uint64
+	lastSysCpu uint64
+}
+
+func (c *CpuCalc) Utilization(cpu uint64, syscpu uint64, ncpus int) int {
+	cpudiff := float64(cpu) - float64(c.lastCpu)
+	syscpudiff := float64(syscpu) - float64(c.lastSysCpu)
+	util := round((cpudiff / syscpudiff * 100) * float64(ncpus))
+	c.lastCpu = cpu
+	c.lastSysCpu = syscpu
+	return util
+}
+
+type Widgets struct {
+	cid     *ui.Par
+	cpu     *ui.Gauge
+	memory  *ui.Gauge
+	cpucalc *CpuCalc
+}
+
+func NewWidgets(id string) *Widgets {
+	cid := ui.NewPar(id)
+	cid.Border = false
+	cid.Height = 1
+	cid.Width = 10
+	cid.TextFgColor = ui.ColorWhite
+	return &Widgets{cid, mkGauge(), mkGauge()}
+}
+
+func mkGauge() *ui.Gauge {
+	g := ui.NewGauge()
+	g.Height = 1
+	g.Border = false
+	g.Percent = 0
+	g.PaddingBottom = 0
+	g.BarColor = ui.ColorGreen
+	g.Label = "-"
+	return g
+}