introduce prompt.OptionCloseOnControlC()

[sgsullivan]

Allows one to optionally have ControlC act like ControlD (close the prompt)

--

func dialogConfirmProceed() (proceed bool) {

        var haveAnswer bool

        f := func(d prompt.Document) []prompt.Suggest {
                s := []prompt.Suggest{
                        {Text: "yes", Description: "I understand continue"},
                        {Text: "no", Description: "I would like to cancel"},
                }
                return prompt.FilterHasPrefix(s, d.GetWordBeforeCursor(), true)
        }

        for !haveAnswer {
                fmt.Printf("Are you sure? ")
                answer := strings.ToLower(prompt.Input("> ", f, prompt.OptionShowCompletionAtStart(), prompt.OptionCloseOnControlC()))
                if answer == "yes" || answer == "no" || answer == "" {
                        haveAnswer = true
                        if answer == "yes" {
                                proceed = true
                        }
                }
        }

        return
}