feat: support timer modifactions on Spinner and Progressbar (#647)

progressbar_printer.go

@@ -132,6 +132,12 @@ func (p ProgressbarPrinter) WithShowPercentage(b ...bool) *ProgressbarPrinter {
 	return &p
 }
 
+// WithStartedAt sets the time when the ProgressbarPrinter started.
+func (p ProgressbarPrinter) WithStartedAt(t time.Time) *ProgressbarPrinter {
+	p.startedAt = t
+	return &p
+}
+
 // WithTitleStyle sets the style of the title.
 func (p ProgressbarPrinter) WithTitleStyle(style *Style) *ProgressbarPrinter {
 	p.TitleStyle = style
@@ -167,6 +173,16 @@ func (p *ProgressbarPrinter) SetWriter(writer io.Writer) {
 	p.Writer = writer
 }
 
+// SetStartedAt sets the time when the ProgressbarPrinter started.
+func (p *ProgressbarPrinter) SetStartedAt(t time.Time) {
+	p.startedAt = t
+}
+
+// ResetTimer resets the timer of the ProgressbarPrinter.
+func (p *ProgressbarPrinter) ResetTimer() {
+	p.startedAt = time.Now()
+}
+
 // Increment current value by one.
 func (p *ProgressbarPrinter) Increment() *ProgressbarPrinter {
 	p.Add(1)

spinner_printer.go

@@ -92,6 +92,12 @@ func (s SpinnerPrinter) WithShowTimer(b ...bool) *SpinnerPrinter {
 	return &s
 }
 
+// WithStartedAt sets the time when the SpinnerPrinter started.
+func (s SpinnerPrinter) WithStartedAt(t time.Time) *SpinnerPrinter {
+	s.startedAt = t
+	return &s
+}
+
 // WithTimerRoundingFactor sets the rounding factor for the timer.
 func (s SpinnerPrinter) WithTimerRoundingFactor(factor time.Duration) *SpinnerPrinter {
 	s.TimerRoundingFactor = factor
@@ -115,6 +121,16 @@ func (p *SpinnerPrinter) SetWriter(writer io.Writer) {
 	p.Writer = writer
 }
 
+// ResetTimer resets the timer of the SpinnerPrinter.
+func (s *SpinnerPrinter) ResetTimer() {
+	s.startedAt = time.Now()
+}
+
+// SetStartedAt sets the time when the SpinnerPrinter started.
+func (s *SpinnerPrinter) SetStartedAt(t time.Time) {
+	s.startedAt = t
+}
+
 // UpdateText updates the message of the active SpinnerPrinter.
 // Can be used live.
 func (s *SpinnerPrinter) UpdateText(text string) {