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package pb
import (
"fmt"
"io"
"math"
"strings"
"sync/atomic"
"time"
)
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) (pb *ProgressBar) {
pb = &ProgressBar{
Total: int64(total),
RefreshRate: DEFAULT_REFRESH_RATE,
ShowPercent: true,
ShowCounters: true,
ShowBar: true,
ShowTimeLeft: true,
}
pb.Format(FORMAT)
return
}
// 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 {
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
Output io.Writer
Callback Callback
NotPrint bool
Units int
isFinish bool
startTime time.Time
BarStart string
BarEnd string
Empty string
Current string
CurrentN string
}
// 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)))
}
// Set custom format for bar
// Example: bar.Format("[=>_]")
func (pb *ProgressBar) Format(format string) (bar *ProgressBar) {
bar = pb
formatEntries := strings.Split(format, "")
if len(formatEntries) != 5 {
return
}
pb.BarStart = formatEntries[0]
pb.BarEnd = formatEntries[4]
pb.Empty = formatEntries[3]
pb.Current = formatEntries[1]
pb.CurrentN = formatEntries[2]
return
}
// Set bar refresh rate
func (pb *ProgressBar) SetRefreshRate(rate time.Duration) (bar *ProgressBar) {
bar = pb
pb.RefreshRate = rate
return
}
// Set units
// bar.SetUnits(U_NO) - by default
// bar.SetUnits(U_BYTES) - for Mb, Kb, etc
func (pb *ProgressBar) SetUnits(units int) (bar *ProgressBar) {
bar = pb
switch units {
case U_NO, U_BYTES:
pb.Units = units
}
return
}
// 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+pb.BarStart+pb.BarEnd+percentBox+timeLeftBox+speedBox)
if size > 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
}
}
// 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
oc = -1
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
}
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