Add captured alias declaration types

app.go

@@ -9,9 +9,10 @@ import (
 // App owns one command registry and its application identity. Each App has an
 // independent registry; command declarations may be reused across Apps.
 type App struct {
-	identity Identity
-	commands map[string]*commandNode
-	snapshot *routingSnapshot
+	identity     Identity
+	commands     map[string]*commandNode
+	routingRules []RoutingRule
+	snapshot     *routingSnapshot
 }
 
 type routingSnapshot struct {
@@ -23,18 +24,22 @@ type commandNode struct {
 	command Command
 }
 
-// New creates an application with the supplied identity and initial commands.
+// New creates an application with the supplied identity and initial
+// declarations.
 // The identity name must not be empty. New installs its generated help and
 // version commands and caller declarations as one batch; an invalid declaration
 // returns an error without exposing an App. The root help and version names are
 // reserved for generated commands.
-func New(identity Identity, commands ...Command) (*App, error) {
+func New(identity Identity, declarations ...Declaration) (*App, error) {
 	if identity.Name == "" {
 		return nil, fmt.Errorf("application identity name must not be empty")
 	}
 
 	app := &App{identity: identity, commands: make(map[string]*commandNode)}
-	all := append(app.builtinCommands(), commands...)
+	builtins := app.builtinCommands()
+	all := make([]Declaration, 0, len(builtins)+len(declarations))
+	all = append(all, builtins...)
+	all = append(all, declarations...)
 	if err := app.installBatch(all...); err != nil {
 		return nil, err
 	}