pb

Terminal progress bar for Go

Simple progress bar for console programs.

Installation

go get github.com/cheggaaa/pb

Usage

package main

import (
	"github.com/cheggaaa/pb"
	"time"
)

func main() {
	count := 100000
	bar := pb.StartNew(count)
	for i := 0; i < count; i++ {
		bar.Increment()
		time.Sleep(time.Millisecond)
	}
	bar.FinishPrint("The End!")
}

Result will be like this:

> go run test.go
37158 / 100000 [================>_______________________________] 37.16% 1m11s

Customization

// create bar
bar := pb.New(count)

// refresh info every second (default 200ms)
bar.SetRefreshRate(time.Second)

// show percents (by default already true)
bar.ShowPercent = true

// show bar (by default already true)
bar.ShowBar = true

// no counters
bar.ShowCounters = false

// show "time left"
bar.ShowTimeLeft = true

// show average speed
bar.ShowSpeed = true

// sets the width of the progress bar
bar.SetWidth(80)

// sets the width of the progress bar, but if terminal size smaller will be ignored
bar.SetMaxWidth(80)

// convert output to readable format (like KB, MB)
bar.SetUnits(pb.U_BYTES)

// and start
bar.Start()

Progress bar for IO Operations

// create and start bar
bar := pb.New(myDataLen).SetUnits(pb.U_BYTES)
bar.Start()

// my io.Reader
r := myReader

// my io.Writer
w := myWriter

// create proxy reader
reader := bar.NewProxyReader(r)

// and copy from pb reader
io.Copy(w, reader)

// create and start bar
bar := pb.New(myDataLen).SetUnits(pb.U_BYTES)
bar.Start()

// my io.Reader
r := myReader

// my io.Writer
w := myWriter

// create multi writer
writer := io.MultiWriter(w, bar)

// and copy
io.Copy(writer, r)

Custom Progress Bar Look-and-feel

bar.Format("<.- >")

Multiple Progress Bars (experimental and unstable)

#####Multiple bars do not works at Windows!!!

Do not print to terminal while pool is active.

package main

import (
    "math/rand"
    "github.com/cheggaaa/pb"    
    "sync"
    "time"
)

// create bars
first := pb.New(200).Prefix("First ")
second := pb.New(200).Prefix("Second ")
third := pb.New(200).Prefix("Third ")
// start pool
pool, err := pb.StartPool(first, second, third)
if err != nil {
	panic(err)
}
// update bars
wg := new(sync.WaitGroup)
for _, bar := range []*pb.ProgressBar{first, second, third} {
	wg.Add(1)
	go func(cb *pb.ProgressBar) {
		for n := 0; n < 200; n++ {
			cb.Increment()
			time.Sleep(time.Millisecond * time.Duration(rand.Intn(100)))
		}
		cb.Finish()
		wg.Done()
	}(bar)
}
wg.Wait()
// close pool
pool.Stop()

The result will be as follows:

$ go run example/multiple.go 
First 141 / 1000 [===============>---------------------------------------] 14.10 % 44s
Second 139 / 1000 [==============>---------------------------------------] 13.90 % 44s
Third 152 / 1000 [================>--------------------------------------] 15.20 % 40s