Please please please use standard command line flag format (getopt_long) instead of the Go’s flag format. It’s super irritating that Go programs do it their own, less convenient way.
For example: https://github.com/DavidGamba/go-getoptions
For example: https://github.com/DavidGamba/go-getoptions
The application in question is using -generate rather than --generate.
The standard on most UNIX-like OSes is that long options, e.g. --long, have two dashes, and short options, e.g. -l, have one.
It allows you to combine multiple options into one. For example, the following two commands are equivalent:
$ ls -laF
$ ls -l -a -F