add patch maker interface

Author: waynz0r

patch/patch.go

@@ -25,14 +25,18 @@ import (
 
 var DefaultPatchMaker = NewPatchMaker(DefaultAnnotator, &K8sStrategicMergePatcher{}, &BaseJSONMergePatcher{})
 
+type Maker interface {
+	Calculate(currentObject, modifiedObject runtime.Object, opts ...CalculateOption) (*PatchResult, error)
+}
+
 type PatchMaker struct {
 	annotator *Annotator
 
 	strategicMergePatcher StrategicMergePatcher
 	jsonMergePatcher      JSONMergePatcher
 }
 
-func NewPatchMaker(annotator *Annotator, strategicMergePatcher StrategicMergePatcher, jsonMergePatcher JSONMergePatcher) *PatchMaker {
+func NewPatchMaker(annotator *Annotator, strategicMergePatcher StrategicMergePatcher, jsonMergePatcher JSONMergePatcher) Maker {
 	return &PatchMaker{
 		annotator: annotator,