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package fetch
import (
"lindenii.org/go/furgit/errs"
"lindenii.org/go/furgit/object/commit"
oid "lindenii.org/go/furgit/object/id"
"lindenii.org/go/furgit/object/stored"
"lindenii.org/go/furgit/object/tag"
"lindenii.org/go/furgit/object/typ"
)
// ExactCommit reads, parses, and wraps the commit at id.
//
// Labels: Life-Parent.
func (fetcher *Fetcher) ExactCommit(id oid.ObjectID) (*stored.Stored[*commit.Commit], error) {
parsed, err := fetcher.parseObject(id)
if err != nil {
return nil, err
}
commit, ok := parsed.(*commit.Commit)
if !ok {
return nil, &errs.ObjectTypeError{OID: id, Got: parsed.ObjectType(), Want: typ.Commit}
}
return stored.New(id, commit), nil
}
// PeelToCommit peels tags until it reaches a commit.
//
// Labels: Life-Parent.
func (fetcher *Fetcher) PeelToCommit(id oid.ObjectID) (*stored.Stored[*commit.Commit], error) {
for {
obj, err := fetcher.ExactObject(id)
if err != nil {
return nil, err
}
switch parsed := obj.Object().(type) {
case *commit.Commit:
return stored.New(id, parsed), nil
case *tag.Tag:
id = parsed.TargetID
default:
return nil, &errs.ObjectTypeError{OID: id, Got: parsed.ObjectType(), Want: typ.Commit}
}
}
}
// PeelToCommitID peels tags until it reaches a commit object ID.
func (fetcher *Fetcher) PeelToCommitID(id oid.ObjectID) (oid.ObjectID, error) {
for {
ty, _, err := fetcher.Header(id)
if err != nil {
return oid.ObjectID{}, err
}
switch ty {
case typ.Commit:
return id, nil
case typ.Tag:
tag, err := fetcher.ExactTag(id)
if err != nil {
return oid.ObjectID{}, err
}
id = tag.Object().TargetID
case typ.Unknown, typ.Tree, typ.Blob:
return oid.ObjectID{}, &errs.ObjectTypeError{OID: id, Got: ty, Want: typ.Commit}
default:
return oid.ObjectID{}, &errs.ObjectTypeError{OID: id, Got: ty, Want: typ.Commit}
}
}
}
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