ref(helm): refactor {home,lint,serve} commands

cmd/helm/helm.go

@@ -86,31 +86,31 @@ func newRootCmd(out io.Writer) *cobra.Command {
 	cmd.AddCommand(
 		newCreateCmd(out),
 		newDeleteCmd(nil, out),
+		newDependencyCmd(out),
+		newFetchCmd(out),
 		newGetCmd(nil, out),
+		newHomeCmd(out),
 		newInitCmd(out),
 		newInspectCmd(nil, out),
 		newInstallCmd(nil, out),
+		newLintCmd(out),
 		newListCmd(nil, out),
+		newPackageCmd(nil, out),
+		newRepoCmd(out),
+		newRollbackCmd(nil, out),
+		newSearchCmd(out),
+		newServeCmd(out),
 		newStatusCmd(nil, out),
+		newUpdateCmd(out),
 		newUpgradeCmd(nil, out),
-		newRollbackCmd(nil, out),
-		newPackageCmd(nil, out),
-		newFetchCmd(out),
 		newVerifyCmd(out),
-		newUpdateCmd(out),
 		newVersionCmd(nil, out),
-		newRepoCmd(out),
-		newDependencyCmd(out),
-		newSearchCmd(out),
 	)
 	return cmd
 }
 
-// RootCommand is the top-level command for Helm.
-var RootCommand = newRootCmd(os.Stdout)
-
 func main() {
-	cmd := RootCommand
+	cmd := newRootCmd(os.Stdout)
 	if err := cmd.Execute(); err != nil {
 		os.Exit(1)
 	}

cmd/helm/home.go

@@ -17,6 +17,9 @@ limitations under the License.
 package main
 
 import (
+	"fmt"
+	"io"
+
 	"github.com/spf13/cobra"
 )
 
@@ -25,17 +28,14 @@ This command displays the location of HELM_HOME. This is where
 any helm configuration files live.
 `
 
-var homeCommand = &cobra.Command{
+func newHomeCmd(out io.Writer) *cobra.Command {
+	cmd := &cobra.Command{
 		Use:   "home",
 		Short: "displays the location of HELM_HOME",
 		Long:  longHomeHelp,
-	Run:   home,
-}
-
-func init() {
-	RootCommand.AddCommand(homeCommand)
-}
-
-func home(cmd *cobra.Command, args []string) {
-	cmd.Printf(homePath() + "\n")
+		Run: func(cmd *cobra.Command, args []string) {
+			fmt.Fprintf(out, homePath()+"\n")
+		},
+	}
+	return cmd
 }

cmd/helm/lint.go

@@ -19,6 +19,7 @@ package main
 import (
 	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -40,30 +41,37 @@ it will emit [ERROR] messages. If it encounters issues that break with conventio
 or recommendation, it will emit [WARNING] messages.
 `
 
-var lintCommand = &cobra.Command{
+type lintCmd struct {
+	strict bool
+	paths  []string
+	out    io.Writer
+}
+
+func newLintCmd(out io.Writer) *cobra.Command {
+	l := &lintCmd{
+		paths: []string{"."},
+		out:   out,
+	}
+	cmd := &cobra.Command{
 		Use:   "lint [flags] PATH",
 		Short: "examines a chart for possible issues",
 		Long:  longLintHelp,
-	RunE:  lintCmd,
-}
-
-var flagStrict bool
-
-func init() {
-	lintCommand.Flags().BoolVarP(&flagStrict, "strict", "", false, "fail on lint warnings")
-	RootCommand.AddCommand(lintCommand)
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) > 0 {
+				l.paths = args
+			}
+			return l.run()
+		},
+	}
+	cmd.Flags().BoolVar(&l.strict, "strict", false, "fail on lint warnings")
+	return cmd
 }
 
 var errLintNoChart = errors.New("No chart found for linting (missing Chart.yaml)")
 
-func lintCmd(cmd *cobra.Command, args []string) error {
-	paths := []string{"."}
-	if len(args) > 0 {
-		paths = args
-	}
-
+func (l *lintCmd) run() error {
 	var lowestTolerance int
-	if flagStrict {
+	if l.strict {
 		lowestTolerance = support.WarningSev
 	} else {
 		lowestTolerance = support.ErrorSev
@@ -71,7 +79,7 @@ func lintCmd(cmd *cobra.Command, args []string) error {
 
 	var total int
 	var failures int
-	for _, path := range paths {
+	for _, path := range l.paths {
 		if linter, err := lintChart(path); err != nil {
 			fmt.Println("==> Skipping", path)
 			fmt.Println(err)
@@ -99,7 +107,7 @@ func lintCmd(cmd *cobra.Command, args []string) error {
 		return fmt.Errorf("%s, %d chart(s) failed", msg, failures)
 	}
 
-	fmt.Printf("%s, no failures\n", msg)
+	fmt.Fprintf(l.out, "%s, no failures\n", msg)
 
 	return nil
 }

cmd/helm/serve.go

@@ -17,6 +17,7 @@ limitations under the License.
 package main
 
 import (
+	"io"
 	"os"
 	"path/filepath"
 
@@ -25,24 +26,31 @@ import (
 	"k8s.io/helm/pkg/repo"
 )
 
-var serveDesc = `This command starts a local chart repository server that serves charts from a local directory.`
-var repoPath string
+const serveDesc = `This command starts a local chart repository server that serves charts from a local directory.`
 
-func init() {
-	serveCmd.Flags().StringVar(&repoPath, "repo-path", localRepoDirectory(), "The local directory path from which to serve charts.")
-	RootCommand.AddCommand(serveCmd)
+type serveCmd struct {
+	repoPath string
+	out      io.Writer
 }
 
-var serveCmd = &cobra.Command{
+func newServeCmd(out io.Writer) *cobra.Command {
+	s := &serveCmd{
+		out: out,
+	}
+	cmd := &cobra.Command{
 		Use:   "serve",
 		Short: "start a local http web server",
 		Long:  serveDesc,
-	RunE:  serve,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return s.run()
+		},
+	}
+	cmd.Flags().StringVar(&s.repoPath, "repo-path", localRepoDirectory(), "The local directory path from which to serve charts.")
+	return cmd
 }
 
-func serve(cmd *cobra.Command, args []string) error {
-
-	repoPath, err := filepath.Abs(repoPath)
+func (s *serveCmd) run() error {
+	repoPath, err := filepath.Abs(s.repoPath)
 	if err != nil {
 		return err
 	}
@@ -50,6 +58,6 @@ func serve(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	repo.StartLocalRepo(repoPath)
+	repo.StartLocalRepo(s.repoPath)
 	return nil
 }