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tag.go
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tag.go
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package git4go
import (
"bytes"
"errors"
"sort"
"strings"
)
func (r *Repository) LookupTag(oid *Oid) (*Tag, error) {
obj, err := objectLookupPrefix(r, oid, GitOidHexSize, ObjectTag)
if obj != nil {
return obj.(*Tag), err
}
return nil, err
}
func (r *Repository) LookupPrefixTag(oid *Oid, length int) (*Tag, error) {
obj, err := objectLookupPrefix(r, oid, length, ObjectTag)
if obj != nil {
return obj.(*Tag), err
}
return nil, err
}
func (r *Repository) ListTag() ([]string, error) {
var tags []string
err := r.ForEachReferenceName(func(path string) error {
if strings.HasPrefix(path, GitRefsTagsDir) {
tags = append(tags, path[len(GitRefsTagsDir)+1:])
}
return nil
})
if err != nil {
return nil, err
}
sort.Strings(tags)
return tags, nil
}
type Tag struct {
gitObject
targetType ObjectType
targetId *Oid
tagger *Signature
message string
name string
}
func (t *Tag) Type() ObjectType {
return ObjectTag
}
func (t *Tag) Peel(targetType ObjectType) (Object, error) {
return peel(t, targetType)
}
func (t *Tag) Message() string {
return t.message
}
func (t *Tag) Name() string {
return t.name
}
func (t *Tag) Tagger() *Signature {
return t.tagger
}
func (t *Tag) Target() Object {
obj, _ := t.repo.Lookup(t.targetId)
return obj
}
func (t *Tag) TargetId() *Oid {
return t.targetId
}
func (t *Tag) TargetType() ObjectType {
return t.targetType
}
func newTag(repo *Repository, oid *Oid, contents []byte) (*Tag, error) {
targetId, offset := parseOidWithPrefix(contents, 0, []byte("object "))
if targetId == nil {
return nil, errors.New("Object field invalid")
}
if len(contents)-offset < 5 {
return nil, errors.New("Object too short")
}
if !bytes.Equal(contents[offset:offset+5], []byte("type ")) {
return nil, errors.New("Type field not found")
}
offset += 5
targetType := ObjectBad
for eol := offset; eol < len(contents); eol++ {
if contents[eol] == '\n' {
targetType = TypeString2Type(string(contents[offset:eol]))
offset = eol + 1
break
}
}
if targetType == ObjectBad {
return nil, errors.New("Invalid object type")
}
if len(contents)-offset < 4 {
return nil, errors.New("Object too short")
}
if !bytes.Equal(contents[offset:offset+4], []byte("tag ")) {
return nil, errors.New("Tag field not found")
}
offset += 4
tagName := ""
for eol := offset; eol < len(contents); eol++ {
if contents[eol] == '\n' {
tagName = string(contents[offset:eol])
offset = eol + 1
break
}
}
var tagger *Signature
var err error
tagger, offset, err = parseSignature(contents, offset, []byte("tagger "))
message := ""
if err == nil {
if offset < len(contents) {
if contents[offset] != '\n' {
return nil, errors.New("No new line before message")
}
message = string(contents[offset+1:])
}
}
return &Tag{
gitObject: gitObject{
repo: repo,
oid: oid,
},
name: tagName,
message: message,
tagger: tagger,
targetId: targetId,
targetType: targetType,
}, nil
}