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// Copyright 2019 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package uio
import (
"io"
"strings"
)
// ProgressReadCloser implements io.ReadCloser and prints Symbol to W after every
// Interval bytes passes through RC.
type ProgressReadCloser struct {
RC io.ReadCloser
Symbol string
Interval int
W io.Writer
counter int
written bool
}
// Read implements io.Reader for ProgressReadCloser.
func (rc *ProgressReadCloser) Read(p []byte) (n int, err error) {
defer func() {
numSymbols := (rc.counter%rc.Interval + n) / rc.Interval
_, _ = rc.W.Write([]byte(strings.Repeat(rc.Symbol, numSymbols)))
rc.counter += n
rc.written = (rc.written || numSymbols > 0)
if err == io.EOF && rc.written {
_, _ = rc.W.Write([]byte("\n"))
}
}()
return rc.RC.Read(p)
}
// Close implements io.Closer for ProgressReader.
func (rc *ProgressReadCloser) Close() error {
return rc.RC.Close()
}
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