example with help about go-prompt HOT 1 CLOSED

func completer(d prompt.Document) []prompt.Suggest {
    tbc := d.TextBeforeCursor()
    args := strings.Split(tbc, " ")
    depth := len()

    switch depth {
    case 1:
         suggests := []prompt.Suggest{
             {Text: "help", "i would my shell to show all valid commands"},
             {Text: "commandA", "..."},
         }
         return prompt.FilterHasPrefix(suggests, d.GetWordBeforeCursor())
    case 2:
        switch args[0] {
        case "help":
            suggests := []prompt.Suggest{
                {Text: "commandA", "i would like to show help message for "commandA""},
                {Text: "commandB", "..."},
            }
            return prompt.FilterHasPrefix(suggests, d.GetWordBeforeCursor())
        case "commandA":
             // return subcommand suggestions of commandA
        }
    case 3:
        switch strings.Join(args[:1], " ") {
        case "help commandA":
            suggests := []prompt.Suggest{
                {Text: "subcommandA", "would show help command for commandA subcommandA"},
                {Text: "subcommandB", "..."},
            }
            return suggests
        }
    }
}