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package fetch
import (
"fmt"
objectid "codeberg.org/lindenii/furgit/object/id"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// PeelToTreeID peels tags until it reaches a tree object ID, or a commit whose
// root tree object ID is then returned.
func (r *Fetcher) PeelToTreeID(id objectid.ObjectID) (objectid.ObjectID, error) {
for {
ty, _, err := r.store.ReadHeader(id)
if err != nil {
return objectid.ObjectID{}, err
}
switch ty {
case objecttype.TypeTree:
return id, nil
case objecttype.TypeCommit:
commit, err := r.ExactCommit(id)
if err != nil {
return objectid.ObjectID{}, err
}
return commit.Object().Tree, nil
case objecttype.TypeTag:
tag, err := r.ExactTag(id)
if err != nil {
return objectid.ObjectID{}, err
}
id = tag.Object().Target
case objecttype.TypeInvalid,
objecttype.TypeBlob,
objecttype.TypeFuture,
objecttype.TypeOfsDelta,
objecttype.TypeRefDelta:
return objectid.ObjectID{}, fmt.Errorf("object/fetch: expected tree-ish object %s, got %v", id, ty)
default:
return objectid.ObjectID{}, fmt.Errorf("object/fetch: expected tree-ish object %s, got %v", id, ty)
}
}
}
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