[QUESTION] Is it possible to make subcommands required, or how to output usage for subcommands?

[danielytics]

Is it possible to make subcommands required, so that if you don't specify them, it prints the help text?

I didn't see anything in the docs and currently the best I can do is match ("", None) and specify a message, but I'd like to just output the help text when this happens (especially in subcommands of subcommands). Is this possible?

Or, alternatively:

Is there an easy way to output the help text for the missing subcommand?

The best I could manage is print_help or generate_usage on the root when get_matches().subcommand() matches with ("", None), but I cannot figure out how to do it on subcommands. There used to be ArgMatches::usage(), that looks like it would have done the trick, but it was removed and I can't figure out another way of generating the usage text for a subcommand. I can't seem to use App::generate_usage for this purpose.

I was following the instructions in the README and I'm using the YAML definitions.

Maybe I'm missing something, I'm new to Rust.

[CreepySkeleton]

https://docs.rs/clap/2.33.1/clap/enum.AppSettings.html#variant.SubcommandRequiredElseHelp

[danielytics]

Thanks, that's definitely something I missed!

So, in case anybody else is looking for this too and is wondering how to do it from YAML:

about: My project
settings:
    - subcommandrequiredelsehelp
subcommands:
  - foo:
      about: First layer subcommand
      settings:
        - subcommandrequiredelsehelp
      subcommands:
        - bar:
              about: Second layer subcommand

or, more succinctly:

about: My project
global_settings:
    - subcommandrequiredelsehelp
subcommands:
  - foo:
      about: First layer subcommand
      subcommands:
        - bar:
              about: Second layer subcommand