flag

type Flag struct {
	// Name is for CLI flag and environment variable.
	// If this field is empty, it will be available only in config file.
	Name string

	// ConfigName is a key in config file. It is also used as a key of viper.
	ConfigName string

	// Shorthand is a shorthand letter.
	Shorthand string

	// Value is the default value. It must be filled to determine the flag type.
	Value interface{}

	// Usage explains how to use the flag.
	Usage string

	// Persistent represents if the flag is persistent
	Persistent bool

	// Deprecated represents if the flag is deprecated
	Deprecated bool
}

type GlobalFlagGroup struct {
	ConfigFile  *Flag
	ShowVersion *Flag // spf13/cobra can't override the logic of version printing like VersionPrinter in urfave/cli. -v needs to be defined ourselves.
	Quiet       *Flag
	Debug       *Flag
	Timeout     *Flag
	CacheDir    *Flag
}

type GlobalOptions struct {
	ConfigFile  string
	ShowVersion bool
	Quiet       bool
	Debug       bool
	Timeout     time.Duration
	CacheDir    string
}

type Options struct {
}