1 files changed, 31 insertions, 0 deletions
diff --git a/object/resolve/peel_to_tree.go b/object/resolve/peel_to_tree.go
new file mode 100644
index 00000000..bb5d2422
--- /dev/null
+++ b/object/resolve/peel_to_tree.go
@@ -0,0 +1,31 @@
+package resolve
+
+import (
+	"fmt"
+
+	"codeberg.org/lindenii/furgit/object"
+	"codeberg.org/lindenii/furgit/object/stored"
+	"codeberg.org/lindenii/furgit/objectid"
+)
+
+// PeelToTree peels tags until it reaches a tree or commit. If it reaches a
+// commit, it returns the commit's root tree.
+func (r *Resolver) PeelToTree(id objectid.ObjectID) (*stored.Stored[*object.Tree], error) {
+	for {
+		obj, err := r.ExactObject(id)
+		if err != nil {
+			return nil, err
+		}
+
+		switch parsed := obj.Object().(type) {
+		case *object.Tree:
+			return stored.New(id, parsed), nil
+		case *object.Commit:
+			return r.ExactTree(parsed.Tree)
+		case *object.Tag:
+			id = parsed.Target
+		default:
+			return nil, fmt.Errorf("object/resolve: expected tree-ish object %s, got %v", id, parsed.ObjectType())
+		}
+	}
+}