String Interpolation with a custom command

[gavmckee80]

@cheynearista

How do I implement a custom command where I pass a string to the GetCmd() function?

In my case below I want to build a command that returns only a single interface - testing with Ethernet1

type ShowInterfaceDescription struct {
	InterfaceDescriptions map[string]InterfaceInfo `json:"interfaceDescriptions"`
}

type InterfaceInfo struct {
	InterfaceStatus    string `json:"interfaceStatus"`
	Description        string `json:"description"`
	LineProtocolStatus string `json:"lineProtocolStatus"`
}

func (s *ShowInterfaceDescription) GetCmd() string {
	i := "Ethernet1"
	return fmt.Sprintf("show interfaces %v description", i)
}