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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package util
import (
"os"
"time"
"github.com/briandowns/spinner"
"github.com/pkg/errors"
)
const (
spinnerTextEllipsis = "..."
spinnerTextDone = "done"
spinnerTextFailed = "failed"
spinnerColor = "blue"
)
var messages = os.Stderr
func Spinner(text string, fn func() error) error {
initialMsg := text + spinnerTextEllipsis + " "
doneMsg := initialMsg + spinnerTextDone + "\n"
failMsg := initialMsg + spinnerTextFailed + "\n"
return loading(initialMsg, doneMsg, failMsg, fn)
}
func loading(initialMsg, doneMsg, failMsg string, fn func() error) error {
done := make(chan struct{})
errc := make(chan error)
go func() {
defer close(done)
s := spinner.New(spinner.CharSets[11], 100*time.Millisecond, spinner.WithWriter(messages))
s.Prefix = initialMsg
s.FinalMSG = doneMsg
s.HideCursor = true
s.Writer = messages
if err := s.Color(spinnerColor); err != nil {
panic(Error(err, "failed setting spinner color"))
}
s.Start()
err := <-errc
if err != nil {
s.FinalMSG = failMsg
}
s.Stop()
}()
err := fn()
errc <- err
<-done
return err
}
func Error(e error, message string) error {
return errors.Wrap(e, message)
}
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