mpb is a Go lib for rendering progress bars in terminal applications.
- Multiple Bars: Multiple progress bars are supported
- Dynamic Total: Set total while bar is running
- Dynamic Add/Remove: Dynamically add or remove bars
- Cancellation: Cancel whole rendering process
- Predefined Decorators: Elapsed time, ewma based ETA, Percentage, Bytes counter
- Decorator's width sync: Synchronized decorator's width among multiple bars
go get github.com/vbauerster/mpb
Note: it is preferable to go get from github.com, rather than gopkg.in. See issue #11.
p := mpb.New(
// override default (80) width
mpb.WithWidth(64),
// override default "[=>-]" format
mpb.WithFormat("╢▌▌░╟"),
// override default 120ms refresh rate
mpb.WithRefreshRate(180*time.Millisecond),
)
total := 100
name := "Single Bar:"
// adding a single bar
bar := p.AddBar(int64(total),
mpb.PrependDecorators(
// display our name with one space on the right
decor.Name(name, decor.WC{W: len(name) + 1, C: decor.DidentRight}),
// replace ETA decorator with "done" message, OnComplete event
decor.OnComplete(
// ETA decorator with ewma age of 60, and width reservation of 4
decor.EwmaETA(decor.ET_STYLE_GO, 60, decor.WC{W: 4}), "done",
),
),
mpb.AppendDecorators(decor.Percentage()),
)
// simulating some work
max := 100 * time.Millisecond
for i := 0; i < total; i++ {
start := time.Now()
time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10)
// ewma based decorators require work duration measurement
bar.IncrBy(1, time.Since(start))
}
// wait for our bar to complete and flush
p.Wait()
var wg sync.WaitGroup
p := mpb.New(mpb.WithWaitGroup(&wg))
total, numBars := 100, 3
wg.Add(numBars)
for i := 0; i < numBars; i++ {
name := fmt.Sprintf("Bar#%d:", i)
bar := p.AddBar(int64(total),
mpb.PrependDecorators(
// simple name decorator
decor.Name(name),
// decor.DSyncWidth bit enables column width synchronization
decor.Percentage(decor.WCSyncSpace),
),
mpb.AppendDecorators(
// replace ETA decorator with "done" message, OnComplete event
decor.OnComplete(
// ETA decorator with ewma age of 60
decor.EwmaETA(decor.ET_STYLE_GO, 60), "done",
),
),
)
// simulating some work
go func() {
defer wg.Done()
max := 100 * time.Millisecond
for i := 0; i < total; i++ {
start := time.Now()
time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10)
// ewma based decorators require work duration measurement
bar.IncrBy(1, time.Since(start))
}
}()
}
// wait for all bars to complete and flush
p.Wait()