Determine if flags were actually passed in (sub)command invocation in golang's cobra/viper-CodePudding

I have a cobra command

var mycommandCmd = &cobra.Command{
    Use:   "mycommand",
    PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
        viper.BindPFlags(cmd.Flags())

and a subcommand

var mysubcommandCmd = &cobra.Command{
    Use:   "mysubcommand",
    Args:  cobra.ExactArgs(1),
    RunE: func(cmd *cobra.Command, args []string) error {
        viper.BindPFlags(cmd.Flags())

which I of course bind together

mycommandCmd.AddCommand(mysubcommandCmd)

I also have some flags for both of them

mycommandCmd.PersistentFlags().BoolP("foo", "", true, "Whether to foo")
mysubcommandCmd.Flags().BoolP("foobar", "", true,  "Whether to foobar")

My question is the following:

Assuming the end go binary is named prog, is there a (cobra / viper) built in way of checking of whether any flags were actually passed during subcommand invocation?

i.e. how can I programmatically distinguish between this

prog mycommand mysubcommand --foobar

and this

prog mycommand mysubcommand

Checking against the default flag values will not work of course (and does not scale against the flag number)

CodePudding user response：

You can do:

isSet:=cmd.Flags().Lookup("foobar").Changed

That should return if the flag was set, or if the default value was used.