Add support for resetting stats without leaving app

data.go

@@ -53,3 +53,10 @@ func (d *Data) MemoryStats() (used []float64) {
 func (d *Data) NetworkStats() (rx, tx []float64) {
 	return d.rxBytes.Data(), d.txBytes.Data()
 }
+
+// Clear clears all data.
+func (d *Data) Clear() {
+	for _, b := range [...]*CircularBuffer{d.cpu, d.mem, d.rxBytes, d.txBytes} {
+		b.Reset()
+	}
+}

main.go

@@ -80,6 +80,11 @@ func main() {
 	ui := initUI(pid, *interval)
 	defer stopUI()
 
+	// handle key r pressing
+	termui.Handle("/sys/kbd/r", func(termui.Event) {
+		data.Clear()
+	})
+
 	ui.HandleKeys()
 
 	ui.AddTimer(*interval, func(e termui.Event) {

ui.go

@@ -182,7 +182,7 @@ func (ui *UI) createHeader(pid int64) {
 	p.TextFgColor = termui.ColorWhite
 	p.BorderLabel = "Monitoring Status.im via adb"
 	p.BorderFg = termui.ColorCyan
-	p.Text = "press 'q' to exit"
+	p.Text = "press 'q' to exit, 'r' to reset"
 
 	p1 := termui.NewPar("")
 	p1.Height = headerHeight