Add kubectl plugin

cmd/plugin/util/util.go

@@ -0,0 +1,55 @@
+/*
+Copyright 2019 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package util
+
+import (
+	"fmt"
+
+	apiv1 "k8s.io/api/core/v1"
+	"k8s.io/cli-runtime/pkg/genericclioptions"
+)
+
+// PrintError receives an error value and prints it if it exists
+func PrintError(e error) {
+	if e != nil {
+		fmt.Println(e)
+	}
+}
+
+func printWithError(s string, e error) {
+	if e != nil {
+		fmt.Println(e)
+	}
+	fmt.Print(s)
+}
+
+func printOrError(s string, e error) error {
+	if e != nil {
+		return e
+	}
+	fmt.Print(s)
+	return nil
+}
+
+// GetNamespace takes a set of kubectl flag values and returns the namespace we should be operating in
+func GetNamespace(flags *genericclioptions.ConfigFlags) string {
+	namespace, _, err := flags.ToRawKubeConfigLoader().Namespace()
+	if err != nil || len(namespace) == 0 {
+		namespace = apiv1.NamespaceDefault
+	}
+	return namespace
+}