hostlist

type FromCmd struct {
	Args          []string
	LineProcessor func(string) []string
}

type HostInfo struct {
	User  string
	Cmd   string
	Index int
	Host  string
	Port  string
	Alias string
}

type HostInfoList []*HostInfo

type Hostlist interface {
	Name() string
	Priority() int // `0` has a higher Priority over `1`
	// Get() ([]string, error)
	Get() (HostInfoList, error)
	// if you're definitely sure that user want to use this Hostlist, return true.
	// for example, if user gives `-f ./xxx`, then obviously that he wants use this file: ./xxx.
	// in this case, no matter Get() method succeed or not, break.
	ShouldBreak() bool
}

type WithFilter interface {
	Hostlist
	Filter(HostInfoList) HostInfoList
}