Code:

{
	defaultConfig := NewConfig()

	output, err := yaml.Marshal(defaultConfig)
	if err != nil {
		fmt.Printf("Unexpected error: %v", err)
	}

	fmt.Printf("%v", string(output))
	// Output:
	// clusters: {}
	// contexts: {}
	// current-context: ""
	// preferences: {}
	// users: {}
}

Output:

clusters: {}
contexts: {}
current-context: ""
preferences: {}
users: {}

Code:

{
	certFile, _ := ioutil.TempFile("", "")
	defer os.Remove(certFile.Name())
	keyFile, _ := ioutil.TempFile("", "")
	defer os.Remove(keyFile.Name())
	caFile, _ := ioutil.TempFile("", "")
	defer os.Remove(caFile.Name())

	certData := "cert"
	keyData := "key"
	caData := "ca"

	config := newMergedConfig(certFile.Name(), certData, keyFile.Name(), keyData, caFile.Name(), caData, nil)

	MinifyConfig(&config)
	ShortenConfig(&config)

	output, _ := yaml.Marshal(config)
	fmt.Printf("%s", string(output))
	// Output:
	// clusters:
	//   cow-cluster:
	//     LocationOfOrigin: ""
	//     certificate-authority-data: REDACTED
	//     server: http://cow.org:8080
	// contexts:
	//   federal-context:
	//     LocationOfOrigin: ""
	//     cluster: cow-cluster
	//     user: red-user
	// current-context: federal-context
	// preferences: {}
	// users:
	//   red-user:
	//     LocationOfOrigin: ""
	//     client-certificate-data: REDACTED
	//     client-key-data: REDACTED
	//     token: red-token
}

Output:

clusters:
  cow-cluster:
    LocationOfOrigin: ""
    certificate-authority-data: REDACTED
    server: http://cow.org:8080
contexts:
  federal-context:
    LocationOfOrigin: ""
    cluster: cow-cluster
    user: red-user
current-context: federal-context
preferences: {}
users:
  red-user:
    LocationOfOrigin: ""
    client-certificate-data: REDACTED
    client-key-data: REDACTED
    token: red-token

Code:

{
	defaultConfig := NewConfig()
	defaultConfig.Preferences.Colors = true
	defaultConfig.Clusters["alfa"] = &Cluster{
		Server:                "https://alfa.org:8080",
		InsecureSkipTLSVerify: true,
		CertificateAuthority:  "path/to/my/cert-ca-filename",
	}
	defaultConfig.Clusters["bravo"] = &Cluster{
		Server:                "https://bravo.org:8080",
		InsecureSkipTLSVerify: false,
	}
	defaultConfig.AuthInfos["white-mage-via-cert"] = &AuthInfo{
		ClientCertificate: "path/to/my/client-cert-filename",
		ClientKey:         "path/to/my/client-key-filename",
	}
	defaultConfig.AuthInfos["red-mage-via-token"] = &AuthInfo{
		Token: "my-secret-token",
	}
	defaultConfig.AuthInfos["black-mage-via-auth-provider"] = &AuthInfo{
		AuthProvider: &AuthProviderConfig{
			Name: "gcp",
			Config: map[string]string{
				"foo":   "bar",
				"token": "s3cr3t-t0k3n",
			},
		},
	}
	defaultConfig.Contexts["bravo-as-black-mage"] = &Context{
		Cluster:   "bravo",
		AuthInfo:  "black-mage-via-auth-provider",
		Namespace: "yankee",
	}
	defaultConfig.Contexts["alfa-as-black-mage"] = &Context{
		Cluster:   "alfa",
		AuthInfo:  "black-mage-via-auth-provider",
		Namespace: "zulu",
	}
	defaultConfig.Contexts["alfa-as-white-mage"] = &Context{
		Cluster:  "alfa",
		AuthInfo: "white-mage-via-cert",
	}
	defaultConfig.CurrentContext = "alfa-as-white-mage"

	output, err := yaml.Marshal(defaultConfig)
	if err != nil {
		fmt.Printf("Unexpected error: %v", err)
	}

	fmt.Printf("%v", string(output))
	// Output:
	// clusters:
	//   alfa:
	//     LocationOfOrigin: ""
	//     certificate-authority: path/to/my/cert-ca-filename
	//     insecure-skip-tls-verify: true
	//     server: https://alfa.org:8080
	//   bravo:
	//     LocationOfOrigin: ""
	//     server: https://bravo.org:8080
	// contexts:
	//   alfa-as-black-mage:
	//     LocationOfOrigin: ""
	//     cluster: alfa
	//     namespace: zulu
	//     user: black-mage-via-auth-provider
	//   alfa-as-white-mage:
	//     LocationOfOrigin: ""
	//     cluster: alfa
	//     user: white-mage-via-cert
	//   bravo-as-black-mage:
	//     LocationOfOrigin: ""
	//     cluster: bravo
	//     namespace: yankee
	//     user: black-mage-via-auth-provider
	// current-context: alfa-as-white-mage
	// preferences:
	//   colors: true
	// users:
	//   black-mage-via-auth-provider:
	//     LocationOfOrigin: ""
	//     auth-provider:
	//       config:
	//         foo: bar
	//         token: s3cr3t-t0k3n
	//       name: gcp
	//   red-mage-via-token:
	//     LocationOfOrigin: ""
	//     token: my-secret-token
	//   white-mage-via-cert:
	//     LocationOfOrigin: ""
	//     client-certificate: path/to/my/client-cert-filename
	//     client-key: path/to/my/client-key-filename
}

Output:

clusters:
  alfa:
    LocationOfOrigin: ""
    certificate-authority: path/to/my/cert-ca-filename
    insecure-skip-tls-verify: true
    server: https://alfa.org:8080
  bravo:
    LocationOfOrigin: ""
    server: https://bravo.org:8080
contexts:
  alfa-as-black-mage:
    LocationOfOrigin: ""
    cluster: alfa
    namespace: zulu
    user: black-mage-via-auth-provider
  alfa-as-white-mage:
    LocationOfOrigin: ""
    cluster: alfa
    user: white-mage-via-cert
  bravo-as-black-mage:
    LocationOfOrigin: ""
    cluster: bravo
    namespace: yankee
    user: black-mage-via-auth-provider
current-context: alfa-as-white-mage
preferences:
  colors: true
users:
  black-mage-via-auth-provider:
    LocationOfOrigin: ""
    auth-provider:
      config:
        foo: bar
        token: s3cr3t-t0k3n
      name: gcp
  red-mage-via-token:
    LocationOfOrigin: ""
    token: my-secret-token
  white-mage-via-cert:
    LocationOfOrigin: ""
    client-certificate: path/to/my/client-cert-filename
    client-key: path/to/my/client-key-filename