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package furgit
import (
"bytes"
"errors"
"fmt"
)
// Tag models an annotated Git tag object.
type Tag[T HashType] struct {
Hash Hash[T]
Target Hash[T]
TargetType ObjType
Name []byte
Tagger *Ident
Message []byte
}
// ObjType allows Tag to satisfy the Object interface.
func (*Tag[T]) ObjType() ObjType {
return ObjTag
}
// parseTag parses a tag object body.
func parseTag[T HashType](id Hash[T], body []byte) (*Tag[T], error) {
t := new(Tag[T])
t.Hash = id
i := 0
var haveTarget, haveType bool
for i < len(body) {
rel := bytes.IndexByte(body[i:], '\n')
if rel < 0 {
return nil, errors.New("furgit: tag: missing newline")
}
line := body[i : i+rel]
i += rel + 1
if len(line) == 0 {
break
}
switch {
case bytes.HasPrefix(line, []byte("object ")):
hash, err := ParseHash[T](string(line[7:]))
if err != nil {
return nil, fmt.Errorf("furgit: tag: object: %w", err)
}
t.Target = hash
haveTarget = true
case bytes.HasPrefix(line, []byte("type ")):
switch string(line[5:]) {
case "commit":
t.TargetType = ObjCommit
case "tree":
t.TargetType = ObjTree
case "blob":
t.TargetType = ObjBlob
case "tag":
t.TargetType = ObjTag
default:
t.TargetType = ObjInvalid
return nil, errors.New("furgit: tag: unknown target type")
}
haveType = true
case bytes.HasPrefix(line, []byte("tag ")):
t.Name = append([]byte(nil), line[4:]...)
case bytes.HasPrefix(line, []byte("tagger ")):
idt, err := parseIdent(line[7:])
if err != nil {
return nil, fmt.Errorf("furgit: tag: tagger: %w", err)
}
t.Tagger = idt
case bytes.HasPrefix(line, []byte("gpgsig ")), bytes.HasPrefix(line, []byte("gpgsig-sha256 ")):
for i < len(body) {
nextRel := bytes.IndexByte(body[i:], '\n')
if nextRel < 0 {
return nil, errors.New("furgit: tag: unterminated gpgsig")
}
if body[i] != ' ' {
break
}
i += nextRel + 1
}
default:
// ignore unknown headers
}
}
if !haveTarget || !haveType {
return nil, errors.New("furgit: tag: missing required headers")
}
t.Message = append([]byte(nil), body[i:]...)
return t, nil
}
func tagBody[T HashType](t *Tag[T]) ([]byte, error) {
var buf bytes.Buffer
fmt.Fprintf(&buf, "object %s\n", t.Target.String())
buf.WriteString("type ")
switch t.TargetType {
case ObjCommit:
buf.WriteString("commit")
case ObjTree:
buf.WriteString("tree")
case ObjBlob:
buf.WriteString("blob")
case ObjTag:
buf.WriteString("tag")
case ObjInvalid, ObjFuture, ObjOfsDelta, ObjRefDelta:
return nil, fmt.Errorf("furgit: tag: invalid target type %d", t.TargetType)
default:
return nil, fmt.Errorf("furgit: tag: invalid target type %d", t.TargetType)
}
buf.WriteByte('\n')
buf.WriteString("tag ")
buf.Write(t.Name)
buf.WriteByte('\n')
if t.Tagger != nil {
buf.WriteString("tagger ")
buf.Write(t.Tagger.Serialize())
buf.WriteByte('\n')
}
buf.WriteByte('\n')
buf.Write(t.Message)
return buf.Bytes(), nil
}
// Serialize renders a Tag into canonical Git format.
func (t *Tag[T]) Serialize() ([]byte, error) {
body, err := tagBody(t)
if err != nil {
return nil, err
}
header, err := headerForType(ObjTag, body)
if err != nil {
return nil, err
}
raw := make([]byte, len(header)+len(body))
copy(raw, header)
copy(raw[len(header):], body)
return raw, nil
}
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