add ctop header, disabled by default

widgets/header.go

@@ -0,0 +1,47 @@
+package widgets
+
+import (
+	"fmt"
+	"time"
+
+	ui "github.com/gizak/termui"
+)
+
+type CTopHeader struct {
+	Time  *ui.Par
+	Count *ui.Par
+}
+
+func NewCTopHeader() *CTopHeader {
+	return &CTopHeader{
+		Time:  headerPar(timeStr()),
+		Count: headerPar("-"),
+	}
+}
+
+func (c *CTopHeader) Row() *ui.Row {
+	c.Time.Text = timeStr()
+	return ui.NewRow(
+		ui.NewCol(2, 0, c.Time),
+		ui.NewCol(2, 0, c.Count),
+	)
+}
+
+func (c *CTopHeader) SetCount(val int) {
+	c.Count.Text = fmt.Sprintf("%d containers", val)
+}
+
+func timeStr() string {
+	return time.Now().Local().Format("15:04:05 MST")
+}
+
+func headerPar(s string) *ui.Par {
+	p := ui.NewPar(fmt.Sprintf(" %s", s))
+	p.Border = false
+	p.Height = 1
+	p.Width = 20
+	p.TextFgColor = ui.ColorDefault
+	p.TextBgColor = ui.ColorWhite
+	p.Bg = ui.ColorWhite
+	return p
+}