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progressbar.go
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progressbar.go
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package progressbar
import (
"errors"
"fmt"
"io"
"os"
"regexp"
"strconv"
"strings"
"sync"
"time"
"github.com/mitchellh/colorstring"
)
// ProgressBar is a thread-safe, simple
// progress bar
type ProgressBar struct {
state state
config config
lock sync.Mutex
}
// State is the basic properties of the bar
type State struct {
CurrentPercent float64
CurrentBytes float64
MaxBytes int64
SecondsSince float64
SecondsLeft float64
KBsPerSecond float64
}
type state struct {
currentNum int64
currentPercent int
lastPercent int
currentSaucerSize int
lastShown time.Time
startTime time.Time
counterTime time.Time
counterNumSinceLast int64
counterLastTenRates []float64
maxLineWidth int
currentBytes float64
finished bool
}
type config struct {
max int64 // max number of the counter
width int
writer io.Writer
theme Theme
renderWithBlankState bool
description string
ignoreLength bool // ignoreLength if max bytes not known
// whether the output is expected to contain color codes
colorCodes bool
maxBytes int64
// show rate of change in kB/sec or MB/sec
showBytes bool
// show the iterations per second
showIterationsPerSecond bool
showIterationsCount bool
// whether the progress bar should attempt to predict the finishing
// time of the progress based on the start time and the average
// number of seconds between increments.
predictTime bool
// minimum time to wait in between updates
throttleDuration time.Duration
// clear bar once finished
clearOnFinish bool
onCompletion func()
}
// Theme defines the elements of the bar
type Theme struct {
Saucer string
SaucerHead string
SaucerPadding string
BarStart string
BarEnd string
}
// Option is the type all options need to adhere to
type Option func(p *ProgressBar)
// OptionSetWidth sets the width of the bar
func OptionSetWidth(s int) Option {
return func(p *ProgressBar) {
p.config.width = s
}
}
// OptionSetTheme sets the elements the bar is constructed of
func OptionSetTheme(t Theme) Option {
return func(p *ProgressBar) {
p.config.theme = t
}
}
// OptionSetWriter sets the output writer (defaults to os.StdOut)
func OptionSetWriter(w io.Writer) Option {
return func(p *ProgressBar) {
p.config.writer = w
}
}
// OptionSetRenderBlankState sets whether or not to render a 0% bar on construction
func OptionSetRenderBlankState(r bool) Option {
return func(p *ProgressBar) {
p.config.renderWithBlankState = r
}
}
// OptionSetDescription sets the description of the bar to render in front of it
func OptionSetDescription(description string) Option {
return func(p *ProgressBar) {
p.config.description = description
}
}
// OptionEnableColorCodes enables or disables support for color codes
// using mitchellh/colorstring
func OptionEnableColorCodes(colorCodes bool) Option {
return func(p *ProgressBar) {
p.config.colorCodes = colorCodes
}
}
// OptionSetPredictTime will also attempt to predict the time remaining.
func OptionSetPredictTime(predictTime bool) Option {
return func(p *ProgressBar) {
p.config.predictTime = predictTime
}
}
// OptionShowCount will also print current count out of total
func OptionShowCount() Option {
return func(p *ProgressBar) {
p.config.showIterationsCount = true
}
}
// OptionShowIts will also print the iterations/second
func OptionShowIts() Option {
return func(p *ProgressBar) {
p.config.showIterationsPerSecond = true
}
}
// OptionThrottle will wait the specified duration before updating again. The default
// duration is 0 seconds.
func OptionThrottle(duration time.Duration) Option {
return func(p *ProgressBar) {
p.config.throttleDuration = duration
}
}
// OptionClearOnFinish will clear the bar once its finished
func OptionClearOnFinish() Option {
return func(p *ProgressBar) {
p.config.clearOnFinish = true
}
}
// OptionOnCompletion will invoke cmpl function once its finished
func OptionOnCompletion(cmpl func()) Option {
return func(p *ProgressBar) {
p.config.onCompletion = cmpl
}
}
// OptionShowBytes will update the progress bar
// configuration settings to display/hide kBytes/Sec
func OptionShowBytes(val bool) Option {
return func(p *ProgressBar) {
p.config.showBytes = val
}
}
var defaultTheme = Theme{Saucer: "█", SaucerPadding: " ", BarStart: "|", BarEnd: "|"}
// NewOptions constructs a new instance of ProgressBar, with any options you specify
func NewOptions(max int, options ...Option) *ProgressBar {
return NewOptions64(int64(max), options...)
}
// NewOptions64 constructs a new instance of ProgressBar, with any options you specify
func NewOptions64(max int64, options ...Option) *ProgressBar {
b := ProgressBar{
state: getBasicState(),
config: config{
writer: os.Stdout,
theme: defaultTheme,
width: 40,
max: max,
throttleDuration: 0 * time.Nanosecond,
predictTime: true,
},
}
for _, o := range options {
o(&b)
}
// ignoreLength if max bytes not known
if b.config.max == -1 {
b.config.ignoreLength = true
b.config.max = int64(b.config.width)
b.config.predictTime = false
}
if b.config.renderWithBlankState {
b.RenderBlank()
}
return &b
}
func getBasicState() state {
now := time.Now()
return state{
startTime: now,
lastShown: now,
counterTime: now,
}
}
// New returns a new ProgressBar
// with the specified maximum
func New(max int) *ProgressBar {
return NewOptions(max)
}
// RenderBlank renders the current bar state, you can use this to render a 0% state
func (p *ProgressBar) RenderBlank() error {
return p.render()
}
// Reset will reset the clock that is used
// to calculate current time and the time left.
func (p *ProgressBar) Reset() {
p.lock.Lock()
defer p.lock.Unlock()
p.state = getBasicState()
}
// Finish will fill the bar to full
func (p *ProgressBar) Finish() error {
p.lock.Lock()
p.state.currentNum = p.config.max
p.lock.Unlock()
return p.Add(0)
}
// Add will add the specified amount to the progressbar
func (p *ProgressBar) Add(num int) error {
return p.Add64(int64(num))
}
// Set wil set the bar to a current number
func (p *ProgressBar) Set(num int) error {
return p.Set64(int64(num))
}
// Set64 wil set the bar to a current number
func (p *ProgressBar) Set64(num int64) error {
p.lock.Lock()
toAdd := int64(num) - p.state.currentNum
p.lock.Unlock()
return p.Add64(toAdd)
}
// Add64 will add the specified amount to the progressbar
func (p *ProgressBar) Add64(num int64) error {
p.lock.Lock()
defer p.lock.Unlock()
if p.config.max == 0 {
return errors.New("max must be greater than 0")
}
if p.config.ignoreLength {
p.state.currentNum = (p.state.currentNum + num) % p.config.max
} else {
p.state.currentNum += num
}
p.state.currentBytes += float64(num)
// reset the countdown timer every second to take rolling average
p.state.counterNumSinceLast += num
if time.Since(p.state.counterTime).Seconds() > 0.5 {
p.state.counterLastTenRates = append(p.state.counterLastTenRates, float64(p.state.counterNumSinceLast)/time.Since(p.state.counterTime).Seconds())
if len(p.state.counterLastTenRates) > 10 {
p.state.counterLastTenRates = p.state.counterLastTenRates[1:]
}
p.state.counterTime = time.Now()
p.state.counterNumSinceLast = 0
}
percent := float64(p.state.currentNum) / float64(p.config.max)
p.state.currentSaucerSize = int(percent * float64(p.config.width))
p.state.currentPercent = int(percent * 100)
updateBar := p.state.currentPercent != p.state.lastPercent && p.state.currentPercent > 0
p.state.lastPercent = p.state.currentPercent
if p.state.currentNum > p.config.max {
return errors.New("current number exceeds max")
}
// always update if show bytes/second or its/second
if updateBar || p.config.showIterationsPerSecond || p.config.maxBytes > 0 {
return p.render()
}
return nil
}
// Clear erases the progress bar from the current line
func (p *ProgressBar) Clear() error {
return clearProgressBar(p.config, p.state)
}
// Describe will change the description shown before the progress, which
// can be changed on the fly (as for a slow running process).
func (p *ProgressBar) Describe(description string) {
p.config.description = description
}
// New64 returns a new ProgressBar
// with the specified maximum
func New64(max int64) *ProgressBar {
return NewOptions64(max)
}
// Get the max of a bar
func (p *ProgressBar) GetMax() int {
return int(p.config.max)
}
// Same as GetMax, but returns int64
func (p *ProgressBar) GetMax64() int64 {
return p.config.max
}
// render renders the progress bar, updating the maximum
// rendered line width. this function is not thread-safe,
// so it must be called with an acquired lock.
func (p *ProgressBar) render() error {
// make sure that the rendering is not happening too quickly
// but always show if the currentNum reaches the max
if time.Since(p.state.lastShown).Nanoseconds() < p.config.throttleDuration.Nanoseconds() &&
p.state.currentNum < p.config.max {
return nil
}
// first, clear the existing progress bar
err := clearProgressBar(p.config, p.state)
if err != nil {
return err
}
// check if the progress bar is finished
if !p.state.finished && p.state.currentNum >= p.config.max {
p.state.finished = true
if !p.config.clearOnFinish {
renderProgressBar(p.config, p.state)
}
if p.config.onCompletion != nil {
p.config.onCompletion()
}
}
if p.state.finished {
return nil
}
// then, re-render the current progress bar
w, err := renderProgressBar(p.config, p.state)
if err != nil {
return err
}
if w > p.state.maxLineWidth {
p.state.maxLineWidth = w
}
p.state.lastShown = time.Now()
return nil
}
// State returns the current state
func (p *ProgressBar) State() State {
p.lock.Lock()
defer p.lock.Unlock()
s := State{}
s.CurrentPercent = float64(p.state.currentNum) / float64(p.config.max)
s.CurrentBytes = p.state.currentBytes
s.MaxBytes = p.config.maxBytes
s.SecondsSince = time.Since(p.state.startTime).Seconds()
if p.state.currentNum > 0 {
s.SecondsLeft = s.SecondsSince / float64(p.state.currentNum) * (float64(p.config.max) - float64(p.state.currentNum))
}
s.KBsPerSecond = float64(p.state.currentBytes) / 1024.0 / s.SecondsSince
return s
}
// regex matching ansi escape codes
var ansiRegex = regexp.MustCompile(`\x1b\[[0-9;]*[a-zA-Z]`)
func renderProgressBar(c config, s state) (int, error) {
leftBrac := ""
rightBrac := ""
saucer := ""
bytesString := ""
str := ""
averageRate := average(s.counterLastTenRates)
if len(s.counterLastTenRates) == 0 || s.finished {
// if no average samples, or if finished,
// then average rate should be the total rate
averageRate = s.currentBytes / time.Since(s.startTime).Seconds()
}
if s.currentSaucerSize > 0 {
if c.ignoreLength {
saucer = strings.Repeat(c.theme.SaucerPadding, s.currentSaucerSize-1)
} else {
saucer = strings.Repeat(c.theme.Saucer, s.currentSaucerSize-1)
}
saucerHead := c.theme.SaucerHead
if saucerHead == "" || s.currentSaucerSize == c.width {
// use the saucer for the saucer head if it hasn't been set
// to preserve backwards compatibility
saucerHead = c.theme.Saucer
}
saucer += saucerHead
}
// show rolling average rate in kB/sec or MB/sec
if c.showBytes {
if bytesString == "" {
bytesString += "("
} else {
bytesString += ", "
}
kbPerSecond := averageRate / 1024.0
if kbPerSecond > 1024.0 {
bytesString += fmt.Sprintf("%0.3f MB/s", kbPerSecond/1024.0)
} else if kbPerSecond > 0 {
bytesString += fmt.Sprintf("%0.3f kB/s", kbPerSecond)
}
}
// show iteration count in "current/total" iterations format
if c.showIterationsCount {
if bytesString == "" {
bytesString += "("
} else {
bytesString += ", "
}
if !c.ignoreLength {
bytesString += fmt.Sprintf("%.0f/%d", s.currentBytes, c.max)
} else {
bytesString += fmt.Sprintf("%.0f/%s", s.currentBytes, "-")
}
}
// show iterations rate
if c.showIterationsPerSecond {
if bytesString == "" {
bytesString += "("
} else {
bytesString += ", "
}
if averageRate > 1 {
bytesString += fmt.Sprintf("%0.0f it/s", averageRate)
} else {
bytesString += fmt.Sprintf("%0.0f it/min", 60*averageRate)
}
}
if bytesString != "" {
bytesString += ")"
}
// show time prediction in "current/total" seconds format
if c.predictTime {
leftBrac = (time.Duration(time.Since(s.startTime).Seconds()) * time.Second).String()
rightBrac = (time.Duration((1/averageRate)*(float64(c.max)-float64(s.currentNum))) * time.Second).String()
} else {
// Give x out of y
leftBrac = strconv.Itoa(int(s.currentNum))
rightBrac = strconv.Itoa(int(c.max))
}
/*
Progress Bar format
Description % |------ | (kb/s) (iteration count) (iteration rate) (predict time)
*/
if c.ignoreLength {
str = fmt.Sprintf("\r%s%4d%% %s%s%s%s %s ",
c.description,
s.currentPercent,
c.theme.BarStart,
saucer,
strings.Repeat(c.theme.SaucerPadding, c.width-s.currentSaucerSize),
c.theme.BarEnd,
bytesString,
)
} else {
str = fmt.Sprintf("\r%s%4d%% %s%s%s%s %s [%s:%s]",
c.description,
s.currentPercent,
c.theme.BarStart,
saucer,
strings.Repeat(c.theme.SaucerPadding, c.width-s.currentSaucerSize),
c.theme.BarEnd,
bytesString,
leftBrac,
rightBrac,
)
}
if c.colorCodes {
// convert any color codes in the progress bar into the respective ANSI codes
str = colorstring.Color(str)
}
// the width of the string, if printed to the console
// does not include the carriage return character
cleanString := strings.Replace(str, "\r", "", -1)
if c.colorCodes {
// the ANSI codes for the colors do not take up space in the console output,
// so they do not count towards the output string width
cleanString = ansiRegex.ReplaceAllString(cleanString, "")
}
// get the amount of runes in the string instead of the
// character count of the string, as some runes span multiple characters.
// see https://stackoverflow.com/a/12668840/2733724
stringWidth := len([]rune(cleanString))
return stringWidth, writeString(c, str)
}
func clearProgressBar(c config, s state) error {
// fill the current line with enough spaces
// to overwrite the progress bar and jump
// back to the beginning of the line
str := fmt.Sprintf("\r%s\r", strings.Repeat(" ", s.maxLineWidth))
return writeString(c, str)
}
func writeString(c config, str string) error {
if _, err := io.WriteString(c.writer, str); err != nil {
return err
}
if f, ok := c.writer.(*os.File); ok {
// ignore any errors in Sync(), as stdout
// can't be synced on some operating systems
// like Debian 9 (Stretch)
f.Sync()
}
return nil
}
// Reader is the progressbar io.Reader struct
type Reader struct {
io.Reader
bar *ProgressBar
}
// Read will read the data and add the number of bytes to the progressbar
func (r *Reader) Read(p []byte) (n int, err error) {
n, err = r.Reader.Read(p)
r.bar.Add(n)
return
}
// Close the reader when it implements io.Closer
func (r *Reader) Close() (err error) {
if closer, ok := r.Reader.(io.Closer); ok {
return closer.Close()
}
r.bar.Finish()
return
}
// Write implement io.Writer
func (p *ProgressBar) Write(b []byte) (n int, err error) {
n = len(b)
p.Add(n)
return
}
// Read implement io.Reader
func (p *ProgressBar) Read(b []byte) (n int, err error) {
n = len(b)
p.Add(n)
return
}
func average(xs []float64) float64 {
total := 0.0
for _, v := range xs {
total += v
}
return total / float64(len(xs))
}