util

type Command struct {
	// Run runs the command.
	// The args are the arguments after the command name.
	Run func(args []string) int

	// UsageLine is the one-line usage message.
	// The first word in the line is taken to be the command name.
	UsageLine string

	// Short is the short description shown in the 'help' output.
	Short string

	// Long is the long message shown in the 'help <this-command>' output.
	Long string

	// Flag is a set of flags specific to this command.
	Flags func() *flag.FlagSet

	// Nargs is the minimum number of arguments expected after flags, specific to this command.
	Nargs int
}

type KingpinCommand func(*kingpin.Application) (*kingpin.CmdClause, KingpinHandler)

type KingpinHandler func(input string) (exitCode int)