Interpret command flag aliases in the parser

execute.go

@@ -80,7 +80,6 @@ func newExecution(app *App, ctx context.Context, streams Streams) *execution {
 	}
 	if app != nil {
 		current.snapshot = app.routeSnapshot()
-		current.session = internalcobra.Prepare(current.snapshot.metadata, current.options)
 	}
 	return current
 }
@@ -89,9 +88,31 @@ func (current *execution) parse(args []string) commandmeta.Result {
 	if current.app == nil {
 		return commandmeta.Result{Failure: &commandmeta.Failure{Message: "cannot parse commands on a nil app"}}
 	}
+	if current.session == nil {
+		current.prepareSession()
+	}
 	return current.session.Parse(args)
 }
 
+func (current *execution) prepareSession() {
+	if current.app == nil {
+		return
+	}
+	if current.snapshot == nil {
+		current.snapshot = current.app.routeSnapshot()
+	}
+	options := current.options
+	if current.snapshot != nil {
+		switch current.route.kind {
+		case routeCanonical:
+			options.FlagAliases = current.snapshot.flagAliases[current.route.canonicalPath.Key()].neutralRecords()
+		case routeDiscovery:
+			options.FlagAliases = current.snapshot.discoveryFlags[current.route.discoveryPath.Key()].neutralRecords()
+		}
+		current.session = internalcobra.Prepare(current.snapshot.metadata, options)
+	}
+}
+
 func (current *execution) presentationSession() *internalcobra.Session {
 	if current.app == nil {
 		return nil
@@ -99,7 +120,8 @@ func (current *execution) presentationSession() *internalcobra.Session {
 	snapshot := current.app.routeSnapshot()
 	if current.session == nil || current.snapshot != snapshot {
 		current.snapshot = snapshot
-		current.session = internalcobra.Prepare(snapshot.metadata, current.options)
+		current.session = nil
+		current.prepareSession()
 	}
 	return current.session
 }