Add Sprintf functaionlity to Debug window

components/debug.go

@@ -1,6 +1,10 @@
 package components
 
-import "github.com/erroneousboat/termui"
+import (
+	"fmt"
+
+	"github.com/erroneousboat/termui"
+)
 
 // Debug can be used to relay debugging information in the Debug component,
 // see event.go on how to use it
@@ -57,3 +61,15 @@ func (d *Debug) Println(text string) {
 
 	termui.Render(d)
 }
+
+func (d *Debug) Sprintf(format string, a ...interface{}) {
+	text := fmt.Sprintf(format, a...)
+	d.List.Items = append(d.List.Items, text)
+
+	// When at the end remove first item
+	if len(d.List.Items) > d.List.InnerBounds().Max.Y-1 {
+		d.List.Items = d.List.Items[1:]
+	}
+
+	termui.Render(d)
+}