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47 lines
940 B
Go
47 lines
940 B
Go
package termstatus
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import (
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"bytes"
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"io"
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)
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// WrapStdio returns line-buffering replacements for os.Stdout and os.Stderr.
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// On Close, the remaining bytes are written, followed by a line break.
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func WrapStdio(term *Terminal) (stdout, stderr io.WriteCloser) {
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return newLineWriter(term.Print), newLineWriter(term.Error)
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}
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type lineWriter struct {
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buf bytes.Buffer
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print func(string)
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}
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var _ io.WriteCloser = &lineWriter{}
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func newLineWriter(print func(string)) *lineWriter {
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return &lineWriter{print: print}
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}
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func (w *lineWriter) Write(data []byte) (n int, err error) {
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n, err = w.buf.Write(data)
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if err != nil {
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return n, err
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}
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// look for line breaks
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buf := w.buf.Bytes()
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i := bytes.LastIndexByte(buf, '\n')
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if i != -1 {
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w.print(string(buf[:i+1]))
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w.buf.Next(i + 1)
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}
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return n, err
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}
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func (w *lineWriter) Close() error {
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if w.buf.Len() > 0 {
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w.print(string(append(w.buf.Bytes(), '\n')))
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}
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return nil
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}
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