type DurationVar struct {
	Var
}

var (
	allVars = make(map[string]Var)
	mutex   sync.Mutex
)

// VarDescriptions returns a description of this process' environment variables, sorted by name.
func VarDescriptions() []Var {
	mutex.Lock()
	sorted := make([]Var, 0, len(allVars))
	for _, v := range allVars {
		sorted = append(sorted, v)
	}
	mutex.Unlock()

	return strings.Replace(id, ".", "-", -1)
}

func (g *generator) genVars(root *cobra.Command, selectFn SelectEnvFn) {
	if selectFn == nil {
		selectFn = DefaultSelectEnvFn
	}

	envVars := env.VarDescriptions()

	count := 0
	for _, v := range envVars {
		if v.Hidden {
			continue
		}
		if !selectFn(v) {
			continue
		}
		count++
	}

	if count == 0 {
		return
	}