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pb.go
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pb.go
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package pb
import (
"fmt"
"io"
"strings"
"sync/atomic"
"time"
)
var (
// Default refresh rate - 200ms
DefaultRefreshRate = time.Millisecond * 200
BarStart = "["
BarEnd = "]"
Empty = "_"
Current = "="
CurrentN = ">"
)
// Create new progress bar object
func New(total int) *ProgressBar {
return &ProgressBar{
Total: int64(total),
RefreshRate: DefaultRefreshRate,
ShowPercent: true,
ShowCounters: true,
ShowBar: true,
ShowTimeLeft: true,
}
}
// Create new object and start
func StartNew(total int) (pb *ProgressBar) {
pb = New(total)
pb.Start()
return
}
// Callback for custom output
// For example:
// bar.Callback = func(s string) {
// mySuperPrint(s)
// }
//
type Callback func(out string)
type ProgressBar struct {
Total int64
RefreshRate time.Duration
ShowPercent, ShowCounters bool
ShowSpeed, ShowTimeLeft, ShowBar bool
Output io.Writer
Callback Callback
NotPrint bool
Units int
current int64
isFinish bool
startTime time.Time
}
// Start print
func (pb *ProgressBar) Start() {
pb.startTime = time.Now()
if pb.Total == 0 {
pb.ShowBar = false
pb.ShowTimeLeft = false
pb.ShowPercent = false
}
go pb.writer()
}
// Increment current value
func (pb *ProgressBar) Increment() int {
return pb.Add(1)
}
// Set current value
func (pb *ProgressBar) Set(current int) {
atomic.StoreInt64(&pb.current, int64(current))
}
// Add to current value
func (pb *ProgressBar) Add(add int) int {
return int(atomic.AddInt64(&pb.current, int64(add)))
}
// End print
func (pb *ProgressBar) Finish() {
pb.isFinish = true
pb.write(atomic.LoadInt64(&pb.current))
if !pb.NotPrint {
fmt.Println()
}
}
// 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
}
func (pb *ProgressBar) write(current int64) {
width, _ := terminalWidth()
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
if pb.ShowTimeLeft && current > 0 {
fromStart := time.Now().Sub(pb.startTime)
perEntry := fromStart / time.Duration(current)
left := time.Duration(pb.Total-current) * perEntry
left = (left / time.Second) * time.Second
if left > 0 {
timeLeftBox = left.String()
}
}
// speed
if pb.ShowSpeed && current > 0 {
fromStart := time.Now().Sub(pb.startTime)
speed := float64(current) / (float64(fromStart) / float64(time.Second))
speedBox = Format(int64(speed), pb.Units) + "/s "
}
// bar
if pb.ShowBar {
size := width - len(countersBox+BarStart+BarEnd+percentBox+timeLeftBox+speedBox)
if size > 0 {
curCount := int(float64(current) / (float64(pb.Total) / float64(size)))
emptCount := size - curCount
barBox = BarStart
if emptCount < 0 {
emptCount = 0
}
if curCount > size {
curCount = size
}
if emptCount <= 0 {
barBox += strings.Repeat(Current, curCount)
} else if curCount > 0 {
barBox += strings.Repeat(Current, curCount-1) + CurrentN
}
barBox += strings.Repeat(Empty, emptCount) + BarEnd
}
}
// check len
out = countersBox + barBox + percentBox + speedBox + timeLeftBox
if len(out) < width {
end = strings.Repeat(" ", width-len(out))
}
out = countersBox + barBox + percentBox + speedBox + timeLeftBox
// and print!
switch {
case pb.Output != nil:
fmt.Fprint(pb.Output, out+end)
case pb.Callback != nil:
pb.Callback(out + end)
case !pb.NotPrint:
fmt.Print("\r" + out + end)
}
}
func (pb *ProgressBar) writer() {
var c, oc int64
for {
if pb.isFinish {
break
}
c = atomic.LoadInt64(&pb.current)
if c != oc {
pb.write(c)
oc = c
}
time.Sleep(pb.RefreshRate)
}
}
type window struct {
Row uint16
Col uint16
Xpixel uint16
Ypixel uint16
}