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package git
import (
"bufio"
"bytes"
"fmt"
"io"
"io/ioutil"
"gopkg.in/src-d/go-git.v3/core"
)
// Tag represents an annotated tag object. It points to a single git object of
// any type, but tags typically are applied to commit or blob objects. It
// provides a reference that associates the target with a tag name. It also
// contains meta-information about the tag, including the tagger, tag date and
// message.
//
// https://git-scm.com/book/en/v2/Git-Internals-Git-References#Tags
type Tag struct {
Hash core.Hash
Type core.ObjectType
Name string
Tagger Signature
Message string
object core.Hash
r *Repository
}
// Decode transforms a core.Object into a Tag struct.
func (t *Tag) Decode(o core.Object) error {
if o.Type() != core.TagObject {
return ErrUnsupportedObject
}
t.Hash = o.Hash()
r := bufio.NewReader(o.Reader())
for {
line, err := r.ReadSlice('\n')
if err != nil && err != io.EOF {
return err
}
line = bytes.TrimSpace(line)
if len(line) == 0 {
break // Start of message
}
split := bytes.SplitN(line, []byte{' '}, 2)
switch string(split[0]) {
case "object":
t.object = core.NewHash(string(split[1]))
case "type":
t.Type, err = core.ParseObjectType(string(split[1]))
if err != nil {
return err
}
case "tag":
t.Name = string(split[1])
case "tagger":
t.Tagger.Decode(split[1])
}
if err == io.EOF {
return nil
}
}
data, err := ioutil.ReadAll(r)
if err != nil {
return err
}
t.Message = string(data)
return nil
}
// Commit returns the commit pointed to by the tag. If the tag points to a
// different type of object ErrUnsupportedObject will be returned.
func (t *Tag) Commit() (*Commit, error) {
if t.Type != core.CommitObject {
return nil, ErrUnsupportedObject
}
return t.r.Commit(t.object)
}
// Tree returns the tree pointed to by the tag. If the tag points to a commit
// object the tree of that commit will be returned. If the tag does not point
// to a commit or tree object ErrUnsupportedObject will be returned.
func (t *Tag) Tree() (*Tree, error) {
// TODO: If the tag is of type commit, follow the commit to its tree?
switch t.Type {
case core.CommitObject:
commit, err := t.r.Commit(t.object)
if err != nil {
return nil, err
}
return commit.Tree(), nil
case core.TreeObject:
return t.r.Tree(t.object)
default:
return nil, ErrUnsupportedObject
}
}
// Blob returns the blob pointed to by the tag. If the tag points to a
// different type of object ErrUnsupportedObject will be returned.
func (t *Tag) Blob() (*Blob, error) {
if t.Type != core.BlobObject {
return nil, ErrUnsupportedObject
}
return t.r.Blob(t.object)
}
// Object returns the object pointed to by the tag.
func (t *Tag) Object() (core.Object, error) {
return t.r.Storage.Get(t.object)
}
// String returns the meta information contained in the tag as a formatted
// string.
func (t *Tag) String() string {
return fmt.Sprintf(
"%s %s\nObject: %s\nType: %s\nTag: %s\nTagger: %s\nDate: %s\n",
core.TagObject, t.Hash, t.object, t.Type, t.Name, t.Tagger.String(), t.Tagger.When,
)
}
// TagIter provides an iterator for a set of tags.
type TagIter struct {
core.ObjectIter
r *Repository
}
// NewTagIter returns a new TagIter for the given Repository and ObjectIter.
func NewTagIter(r *Repository, iter core.ObjectIter) *TagIter {
return &TagIter{iter, r}
}
// Next moves the iterator to the next tag and returns a pointer to it. If it
// has reached the end of the set it will return io.EOF.
func (iter *TagIter) Next() (*Tag, error) {
obj, err := iter.ObjectIter.Next()
if err != nil {
return nil, err
}
tag := &Tag{r: iter.r}
return tag, tag.Decode(obj)
}
// Close releases any resources used by the iterator.
func (iter *TagIter) Close() {
iter.Close()
}
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