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// Package peel peels Git object references through annotated tags.
package peel
import (
stderrors "errors"
giterrors "codeberg.org/lindenii/furgit/errors"
"codeberg.org/lindenii/furgit/object"
objectid "codeberg.org/lindenii/furgit/object/id"
"codeberg.org/lindenii/furgit/objectstore"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// ToCommit peels annotated tags transitively until a commit is reached.
func ToCommit(store objectstore.Store, id objectid.ObjectID) (objectid.ObjectID, error) {
for {
ty, _, err := store.ReadHeader(id)
if err != nil {
if stderrors.Is(err, objectstore.ErrObjectNotFound) {
return objectid.ObjectID{}, &giterrors.ObjectMissingError{OID: id}
}
return objectid.ObjectID{}, err
}
if ty != objecttype.TypeTag {
if ty != objecttype.TypeCommit {
return objectid.ObjectID{}, &giterrors.ObjectTypeError{OID: id, Got: ty, Want: objecttype.TypeCommit}
}
return id, nil
}
_, content, err := store.ReadBytesContent(id)
if err != nil {
if stderrors.Is(err, objectstore.ErrObjectNotFound) {
return objectid.ObjectID{}, &giterrors.ObjectMissingError{OID: id}
}
return objectid.ObjectID{}, err
}
tag, err := object.ParseTag(content, id.Algorithm())
if err != nil {
return objectid.ObjectID{}, err
}
id = tag.Target
}
}
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