forked from gopasspw/gopass
/
reader.go
44 lines (39 loc) · 912 Bytes
/
reader.go
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package termio
import (
"bytes"
"io"
)
// LineReader is an unbuffered line reader
type LineReader struct {
r io.Reader
}
// NewReader creates a new line reader
func NewReader(r io.Reader) *LineReader {
return &LineReader{r: r}
}
// Read implements io.Reader
func (lr LineReader) Read(p []byte) (int, error) {
return lr.r.Read(p)
}
// ReadLine reads one line w/o buffering
func (lr LineReader) ReadLine() (string, error) {
out := &bytes.Buffer{}
buf := make([]byte, 1) // important: we must only read one byte at a time!
for {
n, err := lr.r.Read(buf)
for i := 0; i < n; i++ {
if buf[i] == '\n' {
return out.String(), nil
}
// err is always nil
_ = out.WriteByte(buf[i])
}
// Callers should always process the n > 0 bytes returned before considering the error err.
if err != nil {
if err == io.EOF {
return out.String(), nil
}
return out.String(), err
}
}
}