ref(cmd): refactor get command

cmd/helm/get.go

@@ -19,6 +19,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io"
 	"time"
 
 	"github.com/spf13/cobra"
@@ -53,48 +54,88 @@ were generated from this release's chart(s). If a chart is dependent on other
 charts, those resources will also be included in the manifest.
 `
 
-var allValues = false
-
 var errReleaseRequired = errors.New("release name is required")
 
-var getCommand = &cobra.Command{
+type getCmd struct {
+	release string
+	out     io.Writer
+	client  helm.Interface
+}
+
+func newGetCmd(client helm.Interface, out io.Writer) *cobra.Command {
+	get := &getCmd{
+		out:    out,
+		client: client,
+	}
+	cmd := &cobra.Command{
 		Use:   "get [flags] RELEASE_NAME",
 		Short: "download a named release",
 		Long:  getHelp,
-	RunE:              getCmd,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return errReleaseRequired
+			}
+			get.release = args[0]
+			return get.run()
+		},
 		PersistentPreRunE: setupConnection,
+	}
+	cmd.AddCommand(newGetValuesCmd(client, out))
+	cmd.AddCommand(newGetManifestCmd(client, out))
+	return cmd
 }
 
-var getValuesCommand = &cobra.Command{
+type getValuesCmd struct {
+	allValues bool
+	getCmd
+}
+
+func newGetValuesCmd(client helm.Interface, out io.Writer) *cobra.Command {
+	get := &getValuesCmd{}
+	get.out = out
+	get.client = client
+	cmd := &cobra.Command{
 		Use:   "values [flags] RELEASE_NAME",
 		Short: "download the values file for a named release",
 		Long:  getValuesHelp,
-	RunE:  getValues,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return errReleaseRequired
+			}
+			get.release = args[0]
+			return get.run()
+		},
+	}
+	cmd.Flags().BoolVarP(&get.allValues, "all", "a", false, "dump all (computed) values")
+	return cmd
+}
+
+type getManifestCmd struct {
+	getCmd
 }
 
-var getManifestCommand = &cobra.Command{
+func newGetManifestCmd(client helm.Interface, out io.Writer) *cobra.Command {
+	get := &getManifestCmd{}
+	get.out = out
+	get.client = client
+	cmd := &cobra.Command{
 		Use:   "manifest [flags] RELEASE_NAME",
 		Short: "download the manifest for a named release",
 		Long:  getManifestHelp,
-	RunE:  getManifest,
-}
-
-func init() {
-	// 'get values' flags.
-	getValuesCommand.PersistentFlags().BoolVarP(&allValues, "all", "a", false, "dump all (computed) values")
-
-	getCommand.AddCommand(getValuesCommand)
-	getCommand.AddCommand(getManifestCommand)
-	RootCommand.AddCommand(getCommand)
-}
-
-// getCmd is the command that implements 'helm get'
-func getCmd(cmd *cobra.Command, args []string) error {
+		RunE: func(cmd *cobra.Command, args []string) error {
 			if len(args) == 0 {
 				return errReleaseRequired
 			}
+			get.release = args[0]
+			return get.run()
+		},
+	}
+	return cmd
+}
 
-	res, err := helm.GetReleaseContent(args[0])
+// getCmd is the command that implements 'helm get'
+func (g *getCmd) run() error {
+	res, err := helm.GetReleaseContent(g.release)
 	if err != nil {
 		return prettyError(err)
 	}
@@ -108,30 +149,26 @@ func getCmd(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	fmt.Printf("CHART: %s-%s\n", res.Release.Chart.Metadata.Name, res.Release.Chart.Metadata.Version)
-	fmt.Printf("RELEASED: %s\n", timeconv.Format(res.Release.Info.LastDeployed, time.ANSIC))
-	fmt.Println("USER-SUPPLIED VALUES:")
-	fmt.Println(res.Release.Config.Raw)
-	fmt.Println("COMPUTED VALUES:")
-	fmt.Println(cfgStr)
-	fmt.Println("MANIFEST:")
-	fmt.Println(res.Release.Manifest)
+	fmt.Fprintf(g.out, "CHART: %s-%s\n", res.Release.Chart.Metadata.Name, res.Release.Chart.Metadata.Version)
+	fmt.Fprintf(g.out, "RELEASED: %s\n", timeconv.Format(res.Release.Info.LastDeployed, time.ANSIC))
+	fmt.Fprintln(g.out, "USER-SUPPLIED VALUES:")
+	fmt.Fprintln(g.out, res.Release.Config.Raw)
+	fmt.Fprintln(g.out, "COMPUTED VALUES:")
+	fmt.Fprintln(g.out, cfgStr)
+	fmt.Fprintln(g.out, "MANIFEST:")
+	fmt.Fprintln(g.out, res.Release.Manifest)
 	return nil
 }
 
 // getValues implements 'helm get values'
-func getValues(cmd *cobra.Command, args []string) error {
-	if len(args) == 0 {
-		return errReleaseRequired
-	}
-
-	res, err := helm.GetReleaseContent(args[0])
+func (g *getValuesCmd) run() error {
+	res, err := helm.GetReleaseContent(g.release)
 	if err != nil {
 		return prettyError(err)
 	}
 
 	// If the user wants all values, compute the values and return.
-	if allValues {
+	if g.allValues {
 		cfg, err := chartutil.CoalesceValues(res.Release.Chart, res.Release.Config, nil)
 		if err != nil {
 			return err
@@ -140,24 +177,20 @@ func getValues(cmd *cobra.Command, args []string) error {
 		if err != nil {
 			return err
 		}
-		fmt.Println(cfgStr)
+		fmt.Fprintln(g.out, cfgStr)
 		return nil
 	}
 
-	fmt.Println(res.Release.Config.Raw)
+	fmt.Fprintln(g.out, res.Release.Config.Raw)
 	return nil
 }
 
 // getManifest implements 'helm get manifest'
-func getManifest(cmd *cobra.Command, args []string) error {
-	if len(args) == 0 {
-		return errReleaseRequired
-	}
-
-	res, err := helm.GetReleaseContent(args[0])
+func (g *getManifestCmd) run() error {
+	res, err := helm.GetReleaseContent(g.release)
 	if err != nil {
 		return prettyError(err)
 	}
-	fmt.Println(res.Release.Manifest)
+	fmt.Fprintln(g.out, res.Release.Manifest)
 	return nil
 }

cmd/helm/helm.go

@@ -86,6 +86,7 @@ func newRootCmd(out io.Writer) *cobra.Command {
 	p.BoolVarP(&flagDebug, "debug", "", false, "enable verbose output")
 
 	cmd.AddCommand(newListCmd(nil, out))
+	cmd.AddCommand(newGetCmd(nil, out))
 
 	return cmd
 }