refactor all container widgets into subpackage

cwidgets/compact/util.go

@@ -0,0 +1,60 @@
+package compact
+
+// Common helper functions
+
+import (
+	"fmt"
+	ui "github.com/gizak/termui"
+)
+
+// Calculate per-column width, given total width and number of items
+func calcWidth(width, items int) int {
+	spacing := colSpacing * items
+	return (width - statusWidth - spacing) / items
+}
+
+func slimHeaderPar(s string) *ui.Par {
+	p := slimPar(s)
+	p.Y = 2
+	p.Height = 2
+	return p
+}
+
+func slimPar(s string) *ui.Par {
+	p := ui.NewPar(s)
+	p.Border = false
+	p.Height = 1
+	p.Width = 20
+	p.TextFgColor = ui.ColorWhite
+	return p
+}
+
+func slimGauge() *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
+}
+
+func centerParText(p *ui.Par) {
+	var text string
+	var padding string
+
+	// strip existing left-padding
+	for i, ch := range p.Text {
+		if string(ch) != " " {
+			text = p.Text[i:]
+			break
+		}
+	}
+
+	padlen := (p.InnerWidth() - len(text)) / 2
+	for i := 0; i < padlen; i++ {
+		padding += " "
+	}
+	p.Text = fmt.Sprintf("%s%s", padding, text)
+}