repo_description: Faster way to switch between clusters and namespaces in kubectl
repo_topics: kubectl kubectl-plugins kubernetes kubernetes-clusters
code: // Copyright 2021 Google LLC
  //
  // 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 kubeconfig
  
  import (
  	"errors"
  
  	"sigs.k8s.io/kustomize/kyaml/yaml"
  )
  
  func (k *Kubeconfig) DeleteContextEntry(deleteName string) error {
  	_, fileIdx, err := k.contextNodeWithFileIndex(deleteName)
  	if err != nil {
  		return err
  	}
  
  	contexts, err := contextsNodeOf(&k.files[fileIdx])
  	if err != nil {
  		return err
  	}
  	return contexts.PipeE(
  		yaml.ElementSetter{
  			Keys:   []string{"name"},
  			Values: []string{deleteName},
  		},
  	)
  }
  
  // ModifyCurrentContext always writes to the first file (matching kubectl behavior).
  func (k *Kubeconfig) ModifyCurrentContext(name string) error {
  	if len(k.files) == 0 {
  		return errNoFiles
  	}
  	return k.files[0].config.PipeE(yaml.SetField("current-context", yaml.NewScalarRNode(name)))
  }
  
  func (k *Kubeconfig) ModifyContextName(old, new string) error {
  	context, _, err := k.contextNodeWithFileIndex(old)
  	if err != nil {
  		return err
  	}
  	if context == nil {
  		return errors.New("\"contexts\" entry is nil")
  	}
  	return context.PipeE(yaml.SetField("name", yaml.NewScalarRNode(new)))
  }
  