Add flag to pretty print json patch

main.go

@@ -20,6 +20,7 @@ var (
 	kubeConfig = flag.String("kubeconfig", "", "Kube config location")
 	context    = flag.String("context", "", "Kube config context")
 	namespace  = flag.String("namespace", "", "Limit to namespace")
+	pretty     = flag.Bool("pretty", false, "Pretty Print json")
 )
 
 func main() {
@@ -52,7 +53,7 @@ func mainErr() error {
 		watcher.MatchName(arg)
 	}
 
-	differ, err := differ.New(clients)
+	differ, err := differ.New(clients, pretty)
 	if err != nil {
 		return err
 	}

pkg/differ/differ.go

@@ -13,18 +13,20 @@ import (
 )
 
 type Differ struct {
-	cache  map[string]runtime.Object
-	mapper meta.RESTMapper
+	cache       map[string]runtime.Object
+	mapper      meta.RESTMapper
+	prettyPrint bool
 }
 
-func New(clients *clients.Clients) (*Differ, error) {
+func New(clients *clients.Clients, pretty *bool) (*Differ, error) {
 	mapper, err := clients.ToRESTMapper()
 	if err != nil {
 		return nil, err
 	}
 	return &Differ{
-		cache:  map[string]runtime.Object{},
-		mapper: mapper,
+		cache:       map[string]runtime.Object{},
+		mapper:      mapper,
+		prettyPrint: *pretty,
 	}, nil
 }
 
@@ -67,7 +69,21 @@ func (d *Differ) Print(obj runtime.Object) error {
 	}
 
 	if string(patch) != "{}" {
-		fmt.Printf("%s %s %s\n", meta.GetResourceVersion(), printKey, patch)
+		patchToPrint := patch
+
+		if d.prettyPrint {
+
+			var result map[string]interface{}
+			if err := json.Unmarshal([]byte(patch), &result); err != nil {
+				return err
+			}
+
+			patchToPrint, err = json.MarshalIndent(result, "", "  ")
+			if err != nil {
+				return err
+			}
+		}
+		fmt.Printf("%s %s %s\n", meta.GetResourceVersion(), printKey, patchToPrint)
 	}
 
 	return nil