Added ValidArgs as object to prevent memory wasting using new Command to subsubcommands

args.go

@@ -35,7 +35,14 @@ func NoArgs(cmd *Command, args []string) error {
 func OnlyValidArgs(cmd *Command, args []string) error {
 	if len(cmd.ValidArgs) > 0 {
 		for _, v := range args {
-			if !stringInSlice(v, cmd.ValidArgs) {
+			if !func() bool {
+				for _, cmdargs := range cmd.ValidArgs {
+					if v == cmdargs.Name {
+						return true
+					}
+				}
+				return false
+			}() {
 				return fmt.Errorf("invalid argument %q for %q%s", v, cmd.CommandPath(), cmd.findSuggestions(args[0]))
 			}
 		}

args_test.go

@@ -34,10 +34,13 @@ func TestNoArgsWithArgs(t *testing.T) {
 
 func TestOnlyValidArgs(t *testing.T) {
 	c := &Command{
-		Use:       "c",
-		Args:      OnlyValidArgs,
-		ValidArgs: []string{"one", "two"},
-		Run:       emptyRun,
+		Use:  "c",
+		Args: OnlyValidArgs,
+		ValidArgs: []ValidArgs{
+			{"one", "one thing"},
+			{"two", "two things"},
+		},
+		Run: emptyRun,
 	}
 
 	output, err := executeCommand(c, "one", "two")
@@ -51,10 +54,13 @@ func TestOnlyValidArgs(t *testing.T) {
 
 func TestOnlyValidArgsWithInvalidArgs(t *testing.T) {
 	c := &Command{
-		Use:       "c",
-		Args:      OnlyValidArgs,
-		ValidArgs: []string{"one", "two"},
-		Run:       emptyRun,
+		Use:  "c",
+		Args: OnlyValidArgs,
+		ValidArgs: []ValidArgs{
+			{"one", "one thing"},
+			{"two", "two things"},
+		},
+		Run: emptyRun,
 	}
 
 	_, err := executeCommand(c, "three")

bash_completions.go

@@ -428,9 +428,11 @@ func writeRequiredFlag(buf *bytes.Buffer, cmd *Command) {
 
 func writeRequiredNouns(buf *bytes.Buffer, cmd *Command) {
 	buf.WriteString("    must_have_one_noun=()\n")
-	sort.Sort(sort.StringSlice(cmd.ValidArgs))
+	sort.Slice(cmd.ValidArgs, func(i, j int) bool {
+		return cmd.ValidArgs[i].Name < cmd.ValidArgs[j].Name
+	})
 	for _, value := range cmd.ValidArgs {
-		buf.WriteString(fmt.Sprintf("    must_have_one_noun+=(%q)\n", value))
+		buf.WriteString(fmt.Sprintf("    must_have_one_noun+=(%q)\n", value.Name))
 	}
 }
 

bash_completions.md

@@ -80,7 +80,12 @@ The `BashCompletionFunction` option is really only valid/useful on the root comm
 In the above example "pod" was assumed to already be typed. But if you want `kubectl get [tab][tab]` to show a list of valid "nouns" you have to set them. Simplified code from `kubectl get` looks like:
 
 ```go
-validArgs []string = { "pod", "node", "service", "replicationcontroller" }
+validArgs []ValidArgs = {
+  {"pod", ""},
+  {"node", ""},
+  {"service", ""},
+  {"replicationcontroller", ""},
+}
 
 cmd := &cobra.Command{
 	Use:     "get [(-o|--output=)json|yaml|template|...] (RESOURCE [NAME] | RESOURCE/NAME ...)",

bash_completions_test.go

@@ -48,9 +48,14 @@ const bashCompletionFunc = `__custom_func() {
 
 func TestBashCompletions(t *testing.T) {
 	rootCmd := &Command{
-		Use:                    "root",
-		ArgAliases:             []string{"pods", "nodes", "services", "replicationcontrollers", "po", "no", "svc", "rc"},
-		ValidArgs:              []string{"pod", "node", "service", "replicationcontroller"},
+		Use:        "root",
+		ArgAliases: []string{"pods", "nodes", "services", "replicationcontrollers", "po", "no", "svc", "rc"},
+		ValidArgs: []ValidArgs{
+			{"pod", ""},
+			{"node", ""},
+			{"service", ""},
+			{"replicationcontroller", ""},
+		},
 		BashCompletionFunction: bashCompletionFunc,
 		Run: emptyRun,
 	}
@@ -111,10 +116,15 @@ func TestBashCompletions(t *testing.T) {
 		Use:        "times [# times] [string to echo]",
 		SuggestFor: []string{"counts"},
 		Args:       OnlyValidArgs,
-		ValidArgs:  []string{"one", "two", "three", "four"},
-		Short:      "Echo anything to the screen more times",
-		Long:       "a slightly useless command for testing.",
-		Run:        emptyRun,
+		ValidArgs: []ValidArgs{
+			{"one", ""},
+			{"two", ""},
+			{"three", ""},
+			{"four", ""},
+		},
+		Short: "Echo anything to the screen more times",
+		Long:  "a slightly useless command for testing.",
+		Run:   emptyRun,
 	}
 
 	echoCmd.AddCommand(timesCmd)

cobra.go

@@ -1,4 +1,4 @@
-// Copyright © 2013 Steve Francia <spf@spf13.com>.
+// Copyright © 2013 Steve Francia <spf@spf13.com>.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.

command.go

@@ -1,4 +1,3 @@
-// Copyright © 2013 Steve Francia <spf@spf13.com>.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
@@ -27,6 +26,17 @@ import (
 	flag "github.com/spf13/pflag"
 )
 
+// This structure has been created to replace
+// ValidArgs []string in Command object to prevent
+// wasting memory when new command objects are added simply
+// to add new subsubcommands.
+type ValidArgs struct {
+	// Name of subcommand
+	Name string
+	// Short description
+	Short string
+}
+
 // Command is just that, a command for your application.
 // E.g.  'go run ...' - 'run' is the command. Cobra requires
 // you to define the usage and description as part of your command
@@ -52,7 +62,9 @@ type Command struct {
 	Example string
 
 	// ValidArgs is list of all valid non-flag arguments that are accepted in bash completions
-	ValidArgs []string
+	// We can use ValidArgs instead of adding new commands to list. This is to prevent
+	// wasting memory with new Command objects.
+	ValidArgs []ValidArgs
 
 	// Expected arguments
 	Args PositionalArgs
@@ -372,7 +384,10 @@ func (c *Command) UsageTemplate() string {
   {{.CommandPath}} [command]{{end}}{{if gt (len .Aliases) 0}}
 
 Aliases:
-  {{.NameAndAliases}}{{end}}{{if .HasExample}}
+  {{.NameAndAliases}}{{end}}{{if .HasValidArgs}}
+	
+Valid Args:{{range .ValidArgs}}
+	{{.Name}} {{.Short}}{{end}}{{end}}{{if .HasExample}}
 
 Examples:
 {{.Example}}{{end}}{{if .HasAvailableSubCommands}}
@@ -393,6 +408,13 @@ Use "{{.CommandPath}} [command] --help" for more information about a command.{{e
 `
 }
 
+func (c *Command) HasValidArgs() bool {
+	if len(c.ValidArgs) > 0 {
+		return true
+	}
+	return false
+}
+
 // HelpTemplate return help template for the command.
 func (c *Command) HelpTemplate() string {
 	if c.helpTemplate != "" {