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// +build linux darwin freebsd netbsd openbsd solaris dragonfly windows
package pb
import (
"sync"
"time"
)
// Create and start new pool with given bars
// You need call pool.Stop() after work
func StartPool(pbs ...*ProgressBar) (pool *Pool, err error) {
pool = new(Pool)
if err = pool.start(); err != nil {
return
}
pool.Add(pbs...)
return
}
type Pool struct {
RefreshRate time.Duration
bars []*ProgressBar
quit chan int
finishOnce sync.Once
}
// Add progress bars.
func (p *Pool) Add(pbs ...*ProgressBar) {
for _, bar := range pbs {
bar.ManualUpdate = true
bar.NotPrint = true
bar.Start()
p.bars = append(p.bars, bar)
}
}
func (p *Pool) start() (err error) {
p.RefreshRate = DefaultRefreshRate
quit, err := lockEcho()
if err != nil {
return
}
p.quit = make(chan int)
go p.writer(quit)
return
}
func (p *Pool) writer(finish chan int) {
var first = true
for {
select {
case <-time.After(p.RefreshRate):
if p.print(first) {
p.print(false)
finish <- 1
return
}
first = false
case <-p.quit:
finish <- 1
return
}
}
}
// Restore terminal state and close pool
func (p *Pool) Stop() error {
// Wait until one final refresh has passed.
time.Sleep(p.RefreshRate)
p.finishOnce.Do(func() {
close(p.quit)
})
return unlockEcho()
}
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