starlark format function like js string interpolation

temp.go

	var predeclared = starlark.StringDict{
		"format": starlark.NewBuiltin("format", func(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
			var function = thread.DebugFrame(1).Callable().(*starlark.Function)

			var locals = function.Locals()
			var globals = function.Globals()

			var formatArgs = make(map[string]starlark.Value)
			for key, val := range globals {
				formatArgs[key] = val
			}

			for idx, local := range locals {
				formatArgs[local.Name] = thread.DebugFrame(1).Local(idx)
			}

			var string = args[0].(starlark.String)
			var format *starlark.Builtin
			if val, err := string.Attr("format"); err != nil {
				return nil, err
			} else {
				format = val.(*starlark.Builtin)
			}

			var formatKwargs = make([]starlark.Tuple, 0)
			for key, val := range formatArgs {
				formatKwargs = append(formatKwargs, starlark.Tuple{starlark.String(key), val})
			}

			return starlark.Call(thread, format, starlark.Tuple{}, formatKwargs)
		}),
	}