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389 lines (338 loc) · 8.5 KB
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Copy pathpb.go
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389 lines (338 loc) · 8.5 KB
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// Simple console progress bars
package pb
import (
"fmt"
"io"
"math"
"strings"
"sync"
"sync/atomic"
"time"
"unicode/utf8"
)
const (
// Default refresh rate - 200ms
DEFAULT_REFRESH_RATE = time.Millisecond * 200
FORMAT = "[=>-]"
)
// DEPRECATED
// variables for backward compatibility, from now do not work
// use pb.Format and pb.SetRefreshRate
var (
DefaultRefreshRate = DEFAULT_REFRESH_RATE
BarStart, BarEnd, Empty, Current, CurrentN string
)
// Create new progress bar object
func New(total int) *ProgressBar {
return New64(int64(total))
}
// Create new progress bar object uding int64 as total
func New64(total int64) *ProgressBar {
pb := &ProgressBar{
Total: total,
RefreshRate: DEFAULT_REFRESH_RATE,
ShowPercent: true,
ShowCounters: true,
ShowBar: true,
ShowTimeLeft: true,
ShowFinalTime: true,
Units: U_NO,
ManualUpdate: false,
finish: make(chan struct{}),
currentValue: -1,
mu: new(sync.Mutex),
}
return pb.Format(FORMAT)
}
// Create new object and start
func StartNew(total int) *ProgressBar {
return New(total).Start()
}
// Callback for custom output
// For example:
// bar.Callback = func(s string) {
// mySuperPrint(s)
// }
//
type Callback func(out string)
type ProgressBar struct {
current int64 // current must be first member of struct (https://code.google.com/p/go/issues/detail?id=5278)
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
finishOnce sync.Once //Guards isFinish
finish chan struct{}
isFinish bool
startTime time.Time
startValue int64
currentValue int64
prefix, postfix string
mu *sync.Mutex
lastPrint string
BarStart string
BarEnd string
Empty string
Current string
CurrentN string
AlwaysUpdate bool
}
// Start print
func (pb *ProgressBar) Start() *ProgressBar {
pb.startTime = time.Now()
pb.startValue = pb.current
if pb.Total == 0 {
pb.ShowTimeLeft = false
pb.ShowPercent = false
}
if !pb.ManualUpdate {
go pb.writer()
}
return pb
}
// Increment current value
func (pb *ProgressBar) Increment() int {
return pb.Add(1)
}
// Set current value
func (pb *ProgressBar) Set(current int) *ProgressBar {
return pb.Set64(int64(current))
}
// Set64 sets the current value as int64
func (pb *ProgressBar) Set64(current int64) *ProgressBar {
atomic.StoreInt64(&pb.current, current)
return pb
}
// Add to current value
func (pb *ProgressBar) Add(add int) int {
return int(pb.Add64(int64(add)))
}
func (pb *ProgressBar) Add64(add int64) int64 {
return atomic.AddInt64(&pb.current, add)
}
// Set prefix string
func (pb *ProgressBar) Prefix(prefix string) *ProgressBar {
pb.prefix = prefix
return pb
}
// Set postfix string
func (pb *ProgressBar) Postfix(postfix string) *ProgressBar {
pb.postfix = postfix
return pb
}
// Set custom format for bar
// Example: bar.Format("[=>_]")
// Example: bar.Format("[\x00=\x00>\x00-\x00]") // \x00 is the delimiter
func (pb *ProgressBar) Format(format string) *ProgressBar {
var formatEntries []string
if len(format) == 5 {
formatEntries = strings.Split(format, "")
} else {
formatEntries = strings.Split(format, "\x00")
}
if len(formatEntries) == 5 {
pb.BarStart = formatEntries[0]
pb.BarEnd = formatEntries[4]
pb.Empty = formatEntries[3]
pb.Current = formatEntries[1]
pb.CurrentN = formatEntries[2]
}
return pb
}
// Set bar refresh rate
func (pb *ProgressBar) SetRefreshRate(rate time.Duration) *ProgressBar {
pb.RefreshRate = rate
return pb
}
// Set units
// bar.SetUnits(U_NO) - by default
// bar.SetUnits(U_BYTES) - for Mb, Kb, etc
func (pb *ProgressBar) SetUnits(units Units) *ProgressBar {
pb.Units = units
return pb
}
// Set max width, if width is bigger than terminal width, will be ignored
func (pb *ProgressBar) SetMaxWidth(width int) *ProgressBar {
pb.Width = width
pb.ForceWidth = false
return pb
}
// Set bar width
func (pb *ProgressBar) SetWidth(width int) *ProgressBar {
pb.Width = width
pb.ForceWidth = true
return pb
}
// End print
func (pb *ProgressBar) Finish() {
//Protect multiple calls
pb.finishOnce.Do(func() {
close(pb.finish)
pb.write(atomic.LoadInt64(&pb.current))
if !pb.NotPrint {
fmt.Println()
}
pb.isFinish = true
})
}
// End print and write string 'str'
func (pb *ProgressBar) FinishPrint(str string) {
pb.Finish()
fmt.Println(str)
}
// implement io.Writer
func (pb *ProgressBar) Write(p []byte) (n int, err error) {
n = len(p)
pb.Add(n)
return
}
// implement io.Reader
func (pb *ProgressBar) Read(p []byte) (n int, err error) {
n = len(p)
pb.Add(n)
return
}
// Create new proxy reader over bar
func (pb *ProgressBar) NewProxyReader(r io.Reader) *Reader {
return &Reader{r, pb}
}
func (pb *ProgressBar) write(current int64) {
width := pb.GetWidth()
var percentBox, countersBox, timeLeftBox, speedBox, barBox, end, out string
// percents
if pb.ShowPercent {
percent := float64(current) / (float64(pb.Total) / float64(100))
percentBox = fmt.Sprintf(" %.02f %% ", percent)
}
// counters
if pb.ShowCounters {
if pb.Total > 0 {
countersBox = fmt.Sprintf("%s / %s ", Format(current, pb.Units), Format(pb.Total, pb.Units))
} else {
countersBox = Format(current, pb.Units) + " / ? "
}
}
// time left
fromStart := time.Now().Sub(pb.startTime)
currentFromStart := current - pb.startValue
select {
case <-pb.finish:
if pb.ShowFinalTime {
left := (fromStart / time.Second) * time.Second
timeLeftBox = left.String()
}
default:
if pb.ShowTimeLeft && currentFromStart > 0 {
perEntry := fromStart / time.Duration(currentFromStart)
left := time.Duration(pb.Total-currentFromStart) * perEntry
left = (left / time.Second) * time.Second
timeLeftBox = left.String()
}
}
// speed
if pb.ShowSpeed && currentFromStart > 0 {
fromStart := time.Now().Sub(pb.startTime)
speed := float64(currentFromStart) / (float64(fromStart) / float64(time.Second))
speedBox = Format(int64(speed), pb.Units) + "/s "
}
barWidth := escapeAwareRuneCountInString(countersBox + pb.BarStart + pb.BarEnd + percentBox + timeLeftBox + speedBox + pb.prefix + pb.postfix)
// bar
if pb.ShowBar {
size := width - barWidth
if size > 0 {
if pb.Total > 0 {
curCount := int(math.Ceil((float64(current) / float64(pb.Total)) * float64(size)))
emptCount := size - curCount
barBox = pb.BarStart
if emptCount < 0 {
emptCount = 0
}
if curCount > size {
curCount = size
}
if emptCount <= 0 {
barBox += strings.Repeat(pb.Current, curCount)
} else if curCount > 0 {
barBox += strings.Repeat(pb.Current, curCount-1) + pb.CurrentN
}
barBox += strings.Repeat(pb.Empty, emptCount) + pb.BarEnd
} else {
barBox = pb.BarStart
pos := size - int(current)%int(size)
if pos-1 > 0 {
barBox += strings.Repeat(pb.Empty, pos-1)
}
barBox += pb.Current
if size-pos-1 > 0 {
barBox += strings.Repeat(pb.Empty, size-pos-1)
}
barBox += pb.BarEnd
}
}
}
// check len
out = pb.prefix + countersBox + barBox + percentBox + speedBox + timeLeftBox + pb.postfix
if escapeAwareRuneCountInString(out) < width {
end = strings.Repeat(" ", width-utf8.RuneCountInString(out))
}
// and print!
pb.mu.Lock()
pb.lastPrint = out + end
pb.mu.Unlock()
switch {
case pb.Output != nil:
fmt.Fprint(pb.Output, "\r"+out+end)
case pb.Callback != nil:
pb.Callback(out + end)
case !pb.NotPrint:
fmt.Print("\r" + out + end)
}
}
func (pb *ProgressBar) GetWidth() int {
if pb.ForceWidth {
return pb.Width
}
width := pb.Width
termWidth, _ := terminalWidth()
if width == 0 || termWidth <= width {
width = termWidth
}
return width
}
// Write the current state of the progressbar
func (pb *ProgressBar) Update() {
c := atomic.LoadInt64(&pb.current)
if pb.AlwaysUpdate || c != pb.currentValue {
pb.write(c)
pb.currentValue = c
}
}
func (pb *ProgressBar) String() string {
return pb.lastPrint
}
// Internal loop for writing progressbar
func (pb *ProgressBar) writer() {
pb.Update()
for {
select {
case <-pb.finish:
return
case <-time.After(pb.RefreshRate):
pb.Update()
}
}
}
type window struct {
Row uint16
Col uint16
Xpixel uint16
Ypixel uint16
}