[BUG] Flytestdlib pflags doesn't bind to passed in default string slice

[pmahindrakar-oss]

Describe the bug

//go:generate pflags UpdateClusterConfig --default-var DefaultUpdateClusterConfig --bind-default-var
var (
	DefaultUpdateClusterConfig = &UpdateClusterConfig{
		DryRun: false,
	}
)

// UpdateClusterConfig used for updating clusters.
type UpdateClusterConfig struct {
	DryRun            bool   `json:"dryRun" pflag:",execute command without making any modifications."`
	ClusterConfigFile string `json:"clusterConfigFile" pflag:",file containing the update cluster config parameters."`
	// Using snake case here since
	EnabledPlugins    []string `json:"enabled_plugins" pflag:",comma separated list of plugins to be enabled on the cluster."`
	EnabledProjects   []string `json:"enabled_projects" pflag:",comma separated list of projects to be enabled on the cluster."`
}

generated pflagset

// GetPFlagSet will return strongly types pflags for all fields in UpdateClusterConfig and its nested types. The format of the
// flags is json-name.json-sub-name... etc.
func (cfg UpdateClusterConfig) GetPFlagSet(prefix string) *pflag.FlagSet {
	cmdFlags := pflag.NewFlagSet("UpdateClusterConfig", pflag.ExitOnError)
	cmdFlags.BoolVar(&DefaultUpdateClusterConfig.DryRun, fmt.Sprintf("%v%v", prefix, "dryRun"), DefaultUpdateClusterConfig.DryRun, "execute command without making any modifications.")
	cmdFlags.StringVar(&DefaultUpdateClusterConfig.ClusterConfigFile, fmt.Sprintf("%v%v", prefix, "clusterConfigFile"), DefaultUpdateClusterConfig.ClusterConfigFile, "file containing the update cluster config parameters.")
	cmdFlags.StringSliceVar(&[]string{}, fmt.Sprintf("%v%v", prefix, "enabled_plugins"), []string{}, "comma separated list of plugins to be enabled on the cluster.")
	cmdFlags.StringSliceVar(&[]string{}, fmt.Sprintf("%v%v", prefix, "enabled_projects"), []string{}, "comma separated list of projects to be enabled on the cluster.")
	return cmdFlags
}

Expected behavior

Expected

// GetPFlagSet will return strongly types pflags for all fields in UpdateClusterConfig and its nested types. The format of the
// flags is json-name.json-sub-name... etc.
func (cfg UpdateClusterConfig) GetPFlagSet(prefix string) *pflag.FlagSet {
	cmdFlags := pflag.NewFlagSet("UpdateClusterConfig", pflag.ExitOnError)
	cmdFlags.BoolVar(&DefaultUpdateClusterConfig.DryRun, fmt.Sprintf("%v%v", prefix, "dryRun"), DefaultUpdateClusterConfig.DryRun, "execute command without making any modifications.")
	cmdFlags.StringVar(&DefaultUpdateClusterConfig.ClusterConfigFile, fmt.Sprintf("%v%v", prefix, "clusterConfigFile"), DefaultUpdateClusterConfig.ClusterConfigFile, "file containing the update cluster config parameters.")
        cmdFlags.StringSliceVar(&DefaultUpdateClusterConfig.EnabledPlugins, fmt.Sprintf("%v%v", prefix, "enabledPlugins"), DefaultUpdateClusterConfig.EnabledPlugins, "comma separated list of plugins to be enabled on the cluster.")
	cmdFlags.StringSliceVar(&DefaultUpdateClusterConfig.EnabledProjects, fmt.Sprintf("%v%v", prefix, "enabledProjects"), DefaultUpdateClusterConfig.EnabledProjects, "comma separated list of projects to be enabled on the cluster.")
	return cmdFlags
}

Additional context to reproduce

No response

Screenshots

No response

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[pmahindrakar-oss]

cc : @EngHabu @katrogan

Currently working around this issue by manually editing the generated file and will take up this fix in a followup