Disable default flags

[mfaerevaag]

Hi! Thanks for the awesome work.

Sorry if this has already been discussed somewhere, but I couldn't find anything on it.

Is it possible to disable the default --help and --version flags? I'm using the derive method.

[mfaerevaag]

So I found #[clap(setting=AppSettings::DisableVersion)], which works, but #[clap(setting=AppSettings::DisableHelpFlags)], does not:

error[E0599]: no variant or associated item named `DisableHelpFlags` found for enum `clap::AppSettings` in the current scope
  --> src/repl.rs:52:29
   |
52 | #[clap(setting=AppSettings::DisableHelpFlags)]
   |                             ^^^^^^^^^^^^^^^^ variant or associated item not found in `clap::AppSettings`

Version: clap = "3.0.0-beta.1"

[CreepySkeleton]

There's #1792 but it has stalled. Would you like to take over?

[mfaerevaag]

Ah, thanks for that. I'll see if I get some spare time, though I can't promise anything 😄

Regarding your comment on why someone would want to disable -h/--help, I have a use case. I'm developing a REPL command-line app, where I use clap to parse each command interactively with try_get_matches_from(readline.split(' ')) basically. Therefore, the clap App it's only a set of nested sub-commands. The help subcommand is super helpful, but, in this case, makes the help (and version) flags redundant.