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package pktline
import (
"bytes"
"errors"
"io"
"strings"
)
var (
// ErrInvalidErrorLine is returned by Decode when the packet line is not an
// error line.
ErrInvalidErrorLine = errors.New("expected an error-line")
errPrefix = []byte("ERR ")
)
// ErrorLine is a packet line that contains an error message.
// Once this packet is sent by client or server, the data transfer process is
// terminated.
// See https://git-scm.com/docs/pack-protocol#_pkt_line_format
type ErrorLine struct {
Text string
}
// Error implements the error interface.
func (e *ErrorLine) Error() string {
return e.Text
}
// Encode encodes the ErrorLine into a packet line.
func (e *ErrorLine) Encode(w io.Writer) error {
p := NewEncoder(w)
return p.Encodef("%s%s\n", string(errPrefix), e.Text)
}
// Decode decodes a packet line into an ErrorLine.
func (e *ErrorLine) Decode(r io.Reader) error {
s := NewScanner(r)
if !s.Scan() {
return s.Err()
}
line := s.Bytes()
if !bytes.HasPrefix(line, errPrefix) {
return ErrInvalidErrorLine
}
e.Text = strings.TrimSpace(string(line[4:]))
return nil
}
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