argparse

type ArgHandler interface {
	// Parse the params and modify cmd accordingly.
	// Returns unused arguments and a possible error.
	HandleArgs(cmd *msg.Cmd, args []string) ([]string, error)
	// Whether the argument handler takes any parameters.
	TakesParameters() bool
	// Describe available parameters
	DescribeParameters() []ParamDescription
}

type Description struct {
	Cmd    string // Name of the command
	First  string // The first class of arguments, if any
	Second string // The second class of arguments, if any
	What   string // What the command does
}

type Param struct {
	Name        string
	RequiresArg bool
	Quantifier  Quantifier
	Description string
}

type ParamDescription struct {
	ParamName        string // Name of the parameter
	ParamValues      string // Description of possible values
	ParamExplanation string // Explanation of this parameter
}

type Parser struct {
	// contains filtered or unexported fields
}

type Quantifier interface {
	Parse(str string) ([]msg.Quantity, error)
	DescribeUsage() string
}