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46package progress
import "sync/atomic"
// Writer will consume a throw away bytes its given (not a passthrough). This is intended to be used with io.MultiWriter
type Writer struct {
current atomic.Int64
size atomic.Int64
done atomic.Bool
}
func NewSizedWriter(size int64) *Writer {
val := &Writer{}
val.size.Store(size)
return val
}
func NewWriter() *Writer {
return NewSizedWriter(-1)
}
func (w *Writer) SetComplete() {
w.done.Store(true)
}
func (w *Writer) Write(p []byte) (int, error) {
n := len(p)
w.current.Add(int64(n))
return n, nil
}
func (w *Writer) Current() int64 {
return w.current.Load()
}
func (w *Writer) Size() int64 {
return w.size.Load()
}
func (w *Writer) Error() error {
if w.done.Load() {
return ErrCompleted
}
return nil
}