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package packp
import (
"fmt"
"io"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/plumbing/format/pktline"
"gopkg.in/src-d/go-git.v4/plumbing/protocol/packp/capability"
)
var (
zeroHashString = plumbing.ZeroHash.String()
)
// Encode writes the ReferenceUpdateRequest encoding to the stream.
func (r *ReferenceUpdateRequest) Encode(w io.Writer) error {
if err := r.validate(); err != nil {
return err
}
e := pktline.NewEncoder(w)
if err := r.encodeShallow(e, r.Shallow); err != nil {
return err
}
if err := r.encodeCommands(e, r.Commands, r.Capabilities); err != nil {
return err
}
if r.Packfile != nil {
if _, err := io.Copy(w, r.Packfile); err != nil {
return err
}
return r.Packfile.Close()
}
return nil
}
func (r *ReferenceUpdateRequest) encodeShallow(e *pktline.Encoder,
h *plumbing.Hash) error {
if h == nil {
return nil
}
objId := []byte(h.String())
return e.Encodef("%s%s", shallow, objId)
}
func (r *ReferenceUpdateRequest) encodeCommands(e *pktline.Encoder,
cmds []*Command, cap *capability.List) error {
if err := e.Encodef("%s\x00%s",
formatCommand(cmds[0]), cap.String()); err != nil {
return err
}
for _, cmd := range cmds[1:] {
if err := e.Encodef(formatCommand(cmd)); err != nil {
return err
}
}
return e.Flush()
}
func formatCommand(cmd *Command) string {
o := cmd.Old.String()
n := cmd.New.String()
return fmt.Sprintf("%s %s %s", o, n, cmd.Name)
}
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