command

type Argument struct {
	Name      string
	ShortName string
	Usage     string
	Type      Flag
}

type ArgumentCollection struct {
	Booleans map[string]bool
	Integers map[string]int
	Strings  map[string]string
}

type Command interface {
	Finish(int, commandTarget) error
	Prepare(string, int, ArgumentCollection) error
	Run(int, commandTarget, commandSource, commandError) error
	Terminate(commandTarget) error
}

type Definition struct {
	Usage string
	Flags []Argument
}

type Flag int

type Input struct {
	Arguments ArgumentCollection
	Name      string
	Length    int64
	Reader    source.Factory
}

type Output struct {
	Writer io.WriteCloser
	Error  io.WriteCloser
}