⬆️ update dependencies, ✨ implement user store

vendor/github.com/alecthomas/kong/visit.go

@@ -0,0 +1,58 @@
+package kong
+
+import (
+	"fmt"
+)
+
+// Next should be called by Visitor to proceed with the walk.
+//
+// The walk will terminate if "err" is non-nil.
+type Next func(err error) error
+
+// Visitor can be used to walk all nodes in the model.
+type Visitor func(node Visitable, next Next) error
+
+// Visit all nodes.
+func Visit(node Visitable, visitor Visitor) error {
+	return visitor(node, func(err error) error {
+		if err != nil {
+			return err
+		}
+		switch node := node.(type) {
+		case *Application:
+			return visitNodeChildren(node.Node, visitor)
+		case *Node:
+			return visitNodeChildren(node, visitor)
+		case *Value:
+		case *Flag:
+			return Visit(node.Value, visitor)
+		default:
+			panic(fmt.Sprintf("unsupported node type %T", node))
+		}
+		return nil
+	})
+}
+
+func visitNodeChildren(node *Node, visitor Visitor) error {
+	if node.Argument != nil {
+		if err := Visit(node.Argument, visitor); err != nil {
+			return err
+		}
+	}
+	for _, flag := range node.Flags {
+		if err := Visit(flag, visitor); err != nil {
+			return err
+		}
+	}
+	for _, pos := range node.Positional {
+		if err := Visit(pos, visitor); err != nil {
+			return err
+		}
+	}
+	for _, child := range node.Children {
+		if err := Visit(child, visitor); err != nil {
+			return err
+		}
+	}
+	return nil
+}