Merge pull request #3240 from Shell32-Natsu/list-builtin

Add command to list builtin plugins

api/konfig/plugins.go

@@ -9,6 +9,7 @@ import (
 	"runtime"
 
 	"sigs.k8s.io/kustomize/api/filesys"
+	"sigs.k8s.io/kustomize/api/internal/plugins/builtinhelpers"
 	"sigs.k8s.io/kustomize/api/types"
 )
 
@@ -157,3 +158,15 @@ func pwdEnv() string {
 	}
 	return "PWD"
 }
+
+// GetBuiltinPluginNames returns a list of builtin plugin names
+func GetBuiltinPluginNames() []string {
+	var ret []string
+	for k := range builtinhelpers.GeneratorFactories {
+		ret = append(ret, k.String())
+	}
+	for k := range builtinhelpers.TransformerFactories {
+		ret = append(ret, k.String())
+	}
+	return ret
+}

kustomize/internal/commands/edit/all.go

@@ -11,6 +11,7 @@ import (
 	"sigs.k8s.io/kustomize/api/loader"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/edit/add"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/edit/fix"
+	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/edit/listbuiltin"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/edit/remove"
 	"sigs.k8s.io/kustomize/kustomize/v3/internal/commands/edit/set"
 )
@@ -46,6 +47,7 @@ func NewCmdEdit(
 			v),
 		fix.NewCmdFix(fSys),
 		remove.NewCmdRemove(fSys, v),
+		listbuiltin.NewCmdListBuiltinPlugin(),
 	)
 	return c
 }

kustomize/internal/commands/edit/listbuiltin/listbuiltin.go

@@ -0,0 +1,29 @@
+// Copyright 2020 The Kubernetes Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+package listbuiltin
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+	"sigs.k8s.io/kustomize/api/konfig"
+)
+
+// NewCmdListBuiltinPlugin return an instance of list-builtin-plugin
+// subcommand
+func NewCmdListBuiltinPlugin() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "alpha-list-builtin-plugin",
+		Short: "[Alpha] List the builtin plugins",
+		Long:  "",
+		Run: func(cmd *cobra.Command, args []string) {
+			plugins := konfig.GetBuiltinPluginNames()
+			fmt.Print("Builtin plugins:\n\n")
+			for _, p := range plugins {
+				fmt.Printf(" * %s\n", p)
+			}
+		},
+	}
+	return cmd
+}