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package signature
import (
"slices"
"strconv"
"lindenii.org/go/lgo/intconv"
)
// Append renders the signature in canonical Git format.
func (signature Signature) Append(dst []byte) ([]byte, error) {
dst = slices.Grow(dst, len(signature.Name)+len(signature.Email)+32)
dst = append(dst, signature.Name...)
dst = append(dst, ' ', '<')
dst = append(dst, signature.Email...)
dst = append(dst, '>', ' ')
dst = strconv.AppendInt(dst, signature.WhenUnix, 10)
dst = append(dst, ' ')
offset := signature.OffsetMinutes
if offset < -(23*60+59) || offset > 23*60+59 {
return dst, ErrInvalidSignature
}
var sign byte = '+'
if offset < 0 {
sign = '-'
offset = -offset
}
hh := offset / 60
mm := offset % 60
hhTens, err := intconv.Int32ToUint8('0' + hh/10)
if err != nil {
return dst, ErrInvalidSignature
}
hhOnes, err := intconv.Int32ToUint8('0' + hh%10)
if err != nil {
return dst, ErrInvalidSignature
}
mmTens, err := intconv.Int32ToUint8('0' + mm/10)
if err != nil {
return dst, ErrInvalidSignature
}
mmOnes, err := intconv.Int32ToUint8('0' + mm%10)
if err != nil {
return dst, ErrInvalidSignature
}
dst = append(dst, sign)
dst = append(dst, hhTens, hhOnes)
dst = append(dst, mmTens, mmOnes)
return dst, nil
}
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