github.com/ActiveState/mpb

Multi Progress Bar

mpb is a Go lib for rendering progress bars in terminal applications.

Features

• Multiple Bars: Multiple progress bars are supported
• Dynamic Total: Set total while bar is running
• Dynamic Addition: Additional bar could be added at later time
• Dynamic Removal: Remove particular bar, before or after completion
• Dynamic Resize: Adaptive bar resize (doesn't work inside tmux)
• Cancellation: Cancel whole rendering process
• Predefined Decorators: Elapsed time, Ewmaest based ETA, Percentage, Bytes counter
• Decorator's width sync: Synchronized decorator's width among multiple bars

Installation

go get github.com/vbauerster/mpb

Note: it is preferable to go get from github.com, rather than gopkg.in. See issue #11.

Usage

Rendering single bar

	p := mpb.New(
		// override default (80) width
		mpb.WithWidth(100),
		// override default "[=>-]" format
		mpb.WithFormat("╢▌▌░╟"),
		// override default 120ms refresh rate
		mpb.WithRefreshRate(100*time.Millisecond),
	)

	total := 100
	name := "Single Bar:"
	// Add a bar
	// You're not limited to just a single bar, add as many as you need
	bar := p.AddBar(int64(total),
		// Prepending decorators
		mpb.PrependDecorators(
			// StaticName decorator with minWidth and no extra config
			// If you need to change name while rendering, use DynamicName
			decor.StaticName(name, len(name), 0),
			// ETA decorator with minWidth and no extra config
			decor.ETA(4, 0),
		),
		// Appending decorators
		mpb.AppendDecorators(
			// Percentage decorator with minWidth and no extra config
			decor.Percentage(5, 0),
		),
	)

	for i := 0; i < total; i++ {
		time.Sleep(time.Duration(rand.Intn(10)+1) * time.Second / 100)
		bar.Increment()
	}
	// Gracefully shutdown mpb's monitor goroutine
	p.Stop()

Rendering multiple bars

	var wg sync.WaitGroup
	p := mpb.New(mpb.WithWaitGroup(&wg))
	total := 100
	numBars := 3
	wg.Add(numBars)

	for i := 0; i < numBars; i++ {
		name := fmt.Sprintf("Bar#%d:", i)
		bar := p.AddBar(int64(total),
			mpb.PrependDecorators(
				decor.StaticName(name, 0, 0),
				// DSyncSpace is shortcut for DwidthSync|DextraSpace
				// means sync the width of respective decorator's column
				// and prepend one extra space.
				decor.Percentage(3, decor.DSyncSpace),
			),
			mpb.AppendDecorators(
				decor.ETA(2, 0),
			),
		)
		go func() {
			defer wg.Done()
			for i := 0; i < total; i++ {
				time.Sleep(time.Duration(rand.Intn(10)+1) * time.Second / 100)
				bar.Increment()
			}
		}()
	}
	// Gracefully shutdown mpb's monitor goroutine
	p.Stop()

Dynamic Total

Adaptive resize

Note: don't expect much, it corrupts if resizing too fast.

Bytes counter decorator

Typeface used in screen shots: Iosevka