Allow --output formatting of kubectl config view, make merge default

docs/kubectl.md

@@ -338,7 +338,7 @@ Usage:
   kubectl config [command]
 
 Available Commands: 
-  view                                                                                                                                                              displays the specified .kubeconfig file or a merged result
+  view                                                                                                                                                              displays merged .kubeconfig settings or a specified .kubeconfig file.
   set-cluster name [--server=server] [--certificate-authority=path/to/certficate/authority] [--api-version=apiversion] [--insecure-skip-tls-verify=true]            Sets a cluster entry in .kubeconfig
   set-credentials name [--auth-path=path/to/auth/file] [--client-certificate=path/to/certficate/file] [--client-key=path/to/key/file] [--token=bearer_token_string] Sets a user entry in .kubeconfig
   set-context name [--cluster=cluster-nickname] [--user=user-nickname] [--namespace=namespace]                                                                      Sets a context entry in .kubeconfig
@@ -395,7 +395,13 @@ Use "kubectl help [command]" for more information about that command.
 ```
 
 #### config view
-displays the specified .kubeconfig file or a merged result
+displays merged .kubeconfig settings or a specified .kubeconfig file.
+Examples:
+  // Show merged .kubeconfig settings.
+  $ kubectl config view
+
+  // Show only local ./.kubeconfig settings
+  $ kubectl config view --local
 
 Usage:
 ```
@@ -421,10 +427,14 @@ Usage:
       --log_flush_frequency=5s: Maximum number of seconds between log flushes
       --logtostderr=true: log to standard error instead of files
       --match-server-version=false: Require server version to match client version
-      --merge=false: merge together the full hierarchy of .kubeconfig files
+      --merge=true: merge together the full hierarchy of .kubeconfig files
       --namespace="": If present, the namespace scope for this CLI request.
+      --no-headers=false: When using the default output, don't print headers
+  -o, --output="": Output format: json|yaml|template|templatefile
+      --output-version="": Output the formatted object with the given version (default api-version)
   -s, --server="": The address of the Kubernetes API server
       --stderrthreshold=2: logs at or above this threshold go to stderr
+  -t, --template="": Template string or path to template file to use when -o=template or -o=templatefile.
       --token="": Bearer token for authentication to the API server.
       --user="": The name of the kubeconfig user to use
       --v=0: log level for V logs

pkg/kubectl/cmd/config/view.go

@@ -21,11 +21,12 @@ import (
 	"io"
 	"os"
 
-	"github.com/ghodss/yaml"
+	"github.com/golang/glog"
 	"github.com/spf13/cobra"
 
 	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd"
 	clientcmdapi "github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubectl/cmd/util"
 )
 
 type viewOptions struct {
@@ -38,40 +39,45 @@ func NewCmdConfigView(out io.Writer, pathOptions *pathOptions) *cobra.Command {
 
 	cmd := &cobra.Command{
 		Use:   "view",
-		Short: "displays the specified .kubeconfig file or a merged result",
-		Long:  `displays the specified .kubeconfig file or a merged result`,
+		Short: "displays merged .kubeconfig settings or a specified .kubeconfig file.",
+		Long: `displays merged .kubeconfig settings or a specified .kubeconfig file.
+Examples:
+  // Show merged .kubeconfig settings.
+  $ kubectl config view
+
+  // Show only local ./.kubeconfig settings
+  $ kubectl config view --local`,
 		Run: func(cmd *cobra.Command, args []string) {
-			err := options.run()
+			printer, _, err := util.PrinterForCommand(cmd)
 			if err != nil {
-				fmt.Printf("%v\n", err)
+				glog.FatalDepth(1, err)
+			}
+			config, err := options.loadConfig()
+			if err != nil {
+				glog.FatalDepth(1, err)
+			}
+			err = printer.PrintObj(config, out)
+			if err != nil {
+				glog.FatalDepth(1, err)
 			}
 		},
 	}
 
-	cmd.Flags().BoolVar(&options.merge, "merge", false, "merge together the full hierarchy of .kubeconfig files")
-
+	util.AddPrinterFlags(cmd)
+	// Default to yaml
+	cmd.Flags().Set("output", "yaml")
+	cmd.Flags().BoolVar(&options.merge, "merge", true, "merge together the full hierarchy of .kubeconfig files")
 	return cmd
 }
 
-func (o viewOptions) run() error {
+func (o viewOptions) loadConfig() (*clientcmdapi.Config, error) {
 	err := o.validate()
 	if err != nil {
-		return err
+		return nil, err
 	}
 
 	config, _, err := o.getStartingConfig()
-	if err != nil {
-		return err
-	}
-
-	content, err := yaml.Marshal(config)
-	if err != nil {
-		return err
-	}
-
-	fmt.Printf("%v", string(content))
-
-	return nil
+	return config, err
 }
 
 func (o viewOptions) validate() error {