Add IsCobraInternalCommand function (#5)

to check if a command is internal to cobra, e.g. help, __completion,. etc,.

misc.go

@@ -97,3 +97,22 @@ func ShowHelp(cmd *cobra.Command, args []string) error {
 	cmd.Help()
 	return fmt.Errorf("Invalid command - see available commands/subcommands above")
 }
+
+func IsCobraInternalCommand(args []string) bool {
+	if len(args) > 1 {
+		cmdPathPieces := args[1:]
+
+		var cmdName string // first "non-flag" arguments
+		for _, arg := range cmdPathPieces {
+			if !strings.HasPrefix(arg, "-") {
+				cmdName = arg
+				break
+			}
+		}
+		switch cmdName {
+		case "help", cobra.ShellCompRequestCmd, cobra.ShellCompNoDescRequestCmd:
+			return true
+		}
+	}
+	return false
+}