pb

package
v0.15.5 Latest Latest
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 Go to latest Published: Aug 19, 2016 License: MIT, BSD-3-Clause Imports: 9 Imported by: 0

README

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

Documentation

Overview

Simple console progress bars

Index

Constants

View Source 
const (
	// AverageMetricAge average over a one-minute period, which means the average
	// age of the metrics is in the period of 30 seconds
	AverageMetricAge float64 = 30.0

	// Decay formula for computing the decay factor for average metric age
	Decay float64 = 2 / (float64(AverageMetricAge) + 1)
)
View Source 
const (
	// Default refresh rate - 200ms
	DEFAULT_REFRESH_RATE = time.Millisecond * 200
	FORMAT               = "[=>-]"
)

Variables

This section is empty.

Functions

func Format 

func Format(i int64, units Units, width int) string

Format integer

func FormatBytes 

func FormatBytes(i int64) (result string)

Convert bytes to human readable string. Like a 2 MB, 64.2 KB, 52 B

func FormatDuration 

func FormatDuration(d time.Duration) string

Types

type Callback 

type Callback func(out string)

Callback for custom output For example: 

bar.Callback = func(s string) {
    mySuperPrint(s)
}

type EWMA 

type EWMA struct {
	// contains filtered or unexported fields
}

EWMA represents the exponentially weighted moving average of a series of numbers.

func (*EWMA) Add 

func (e *EWMA) Add(value float64)

Add a value to the series and update the moving average.

func (*EWMA) Value 

func (e *EWMA) Value() float64

Value returns the current value of the moving average.

type ProgressBar 

type ProgressBar struct {
	Total                            int64
	RefreshRate                      time.Duration
	ShowPercent, ShowCounters        bool
	ShowSpeed, ShowTimeLeft, ShowBar bool
	ShowFinalTime                    bool
	Output                           io.Writer
	Callback                         Callback
	NotPrint                         bool
	Units                            Units
	Width                            int
	ForceWidth                       bool
	ManualUpdate                     bool

	// default width for unit numbers and time box
	UnitsWidth   int
	TimeBoxWidth int
	BarWidth     int

	BarStart string
	BarEnd   string
	Empty    string
	Current  string
	CurrentN string

	AlwaysUpdate bool
	// contains filtered or unexported fields
}

func New 

func New(total int) *ProgressBar

Create new progress bar object

func New64 

func New64(total int64) *ProgressBar

Create new progress bar object uding int64 as total

func StartNew 

func StartNew(total int) *ProgressBar

Create new object and start

func (*ProgressBar) Finish 

func (pb *ProgressBar) Finish()

End print

func (*ProgressBar) Format 

func (pb *ProgressBar) Format(format string) *ProgressBar

Set custom format for bar Example: bar.Format("[=>_]") Example: bar.Format("[\x00=\x00>\x00-\x00]") // \x00 is the delimiter

func (*ProgressBar) GOString 

func (pb *ProgressBar) GOString() string

func (*ProgressBar) GetWidth 

func (pb *ProgressBar) GetWidth() int

func (*ProgressBar) Postfix 

func (pb *ProgressBar) Postfix(postfix string) *ProgressBar

Set postfix string

func (*ProgressBar) Prefix 

func (pb *ProgressBar) Prefix(prefix string) *ProgressBar

Set prefix string

func (*ProgressBar) Set64 

func (pb *ProgressBar) Set64(current int64) *ProgressBar

Set64 sets the current value as int64

func (*ProgressBar) SetMaxWidth 

func (pb *ProgressBar) SetMaxWidth(width int) *ProgressBar

Set max width, if width is bigger than terminal width, will be ignored

func (*ProgressBar) SetRefreshRate 

func (pb *ProgressBar) SetRefreshRate(rate time.Duration) *ProgressBar

Set bar refresh rate

func (*ProgressBar) SetScale 

func (pb *ProgressBar) SetScale(scale float64) *ProgressBar

func (*ProgressBar) SetUnits 

func (pb *ProgressBar) SetUnits(units Units) *ProgressBar

Set units bar.SetUnits(U_NO) - by default bar.SetUnits(U_BYTES) - for Mb, Kb, etc

func (*ProgressBar) SetWidth 

func (pb *ProgressBar) SetWidth(width int) *ProgressBar

Set bar width

func (*ProgressBar) Start 

func (pb *ProgressBar) Start() *ProgressBar

Start print

func (*ProgressBar) Update 

func (pb *ProgressBar) Update()

Write the current state of the progressbar

type Units 

type Units int
const (
	// By default, without type handle
	U_NO Units = iota
	// Handle as b, Kb, Mb, etc
	U_BYTES
)

Source Files

View all Source files

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