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package main
import (
"fmt"
"math/rand"
"sync"
"time"
"github.com/vbauerster/mpb/v8"
"github.com/vbauerster/mpb/v8/decor"
)
func main() {
var wg sync.WaitGroup
// passed wg will be accounted at p.Wait() call
p := mpb.New(
mpb.WithWaitGroup(&wg),
mpb.WithWidth(16),
)
total, numBars := 101, 3
wg.Add(numBars)
condFillerBuilder := func(cond bool) mpb.BarFillerBuilder {
if cond {
s := mpb.SpinnerStyle("∙∙∙", "●∙∙", "∙●∙", "∙∙●", "∙∙∙")
return s.Meta(func(s string) string {
return "\033[31m" + s + "\033[0m" // red
})
}
return mpb.BarStyle().Lbound("╢").Filler("▌").Tip("▌").Padding("░").Rbound("╟")
}
for i := 0; i < numBars; i++ {
name := fmt.Sprintf("Bar#%d:", i)
bar := p.New(int64(total),
condFillerBuilder(i != 0),
mpb.PrependDecorators(
// simple name decorator
decor.Name(name),
),
mpb.AppendDecorators(
// replace ETA decorator with "done" message, OnComplete event
decor.OnComplete(
// ETA decorator with ewma age of 30
decor.EwmaETA(decor.ET_STYLE_GO, 30), "done",
),
),
)
// simulating some work
go func() {
defer wg.Done()
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
max := 100 * time.Millisecond
for i := 0; i < total; i++ {
// start variable is solely for EWMA calculation
// EWMA's unit of measure is an iteration's duration
start := time.Now()
time.Sleep(time.Duration(rng.Intn(10)+1) * max / 10)
// we need to call EwmaIncrement to fulfill ewma decorator's contract
bar.EwmaIncrement(time.Since(start))
}
}()
}
// wait for passed wg and for all bars to complete and flush
p.Wait()
}
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