Install command batches through one path

app.go

@@ -8,15 +8,13 @@ import (
 
 // App owns one command registry and its application identity.
 type App struct {
-	identity         Identity
-	commands         map[string]*commandNode
-	commandTree      *internalcobra.Command
-	configRegistered bool
+	identity    Identity
+	commands    map[string]*commandNode
+	commandTree *internalcobra.Command
 }
 
 type commandNode struct {
-	command  Command
-	reserved bool
+	command Command
 }
 
 // New creates an application with the supplied identity and initial commands.
@@ -27,23 +25,9 @@ func New(identity Identity, commands ...Command) (*App, error) {
 		return nil, fmt.Errorf("application identity name must not be empty")
 	}
 
-	app := &App{
-		identity: identity,
-		commands: map[string]*commandNode{
-			"help": {
-				command:  Command{record: &commandRecord{name: "help", summary: "Show help for commands."}},
-				reserved: true,
-			},
-			"version": {
-				command:  Command{record: &commandRecord{name: "version", summary: "Show application version."}},
-				reserved: true,
-			},
-		},
-	}
-	if err := app.installBuiltins(); err != nil {
-		return nil, err
-	}
-	if err := app.Register(commands...); err != nil {
+	app := &App{identity: identity, commands: make(map[string]*commandNode)}
+	all := append(app.builtinCommands(), commands...)
+	if err := app.installBatch(all...); err != nil {
 		return nil, err
 	}
 	return app, nil