Simple Progress

progress.go

import(
	"fmt"
	"io"
	"os"
	"time"
)

const DEFAULT_FORMAT = "\r%s   % 3d %%  %d kb %0.2f kb/s %v      "

type ProgressBar struct {
	Out io.Writer
	Format string
	Subject string
	StartTime time.Time
	Size int64
}

func NewProgressBar(subject string, size int64) ProgressBar {
	return ProgressBar{os.Stdout, DEFAULT_FORMAT, subject, time.Now(), size}
}

func (pb ProgressBar) Update(tot int64) {
	percent := int64(0)
	if pb.Size > int64(0) {
		percent = (int64(100) * tot) / pb.Size
	}
	totTime := time.Now().Sub(pb.StartTime)
	spd := float64(tot/1000) / totTime.Seconds()
	//TODO put kb size into format string
	fmt.Fprintf(pb.Out, pb.Format, pb.Subject, percent, tot, spd, totTime)

}