difficulties with usage with a custom help subcommand

[crowlKats]

I am creating a "help" subcommand that isnt the built-in one, and it then has other subcommands defined to itself mirror all other subcommands in the app (so the same as the built-in help subcommand).

however for some reason the usage text is lacking the top-level command/app name.
ie: deno help run
built-in: gives Usage: deno run [OPTIONS] [SCRIPT_ARG]...
custom: gives Usage: run [OPTIONS] [SCRIPT_ARG]...

This however doesn't happen with a custom "help" flag (first branch), as in both custom and built-in show the full usage.

Here is the matching logic:

  if matches.contains_id("help") {
    let subcommand = if let Some((sub, _)) = matches.remove_subcommand() {
      app.find_subcommand(sub).unwrap().clone()
    } else {
      app
    };

    help_parse(&mut flags, subcommand);
    return Ok(flags);
  } else if let Some(help_subcommand_matches) = matches.subcommand_matches("help") {
    let subcommand = if let Some(sub) = help_subcommand_matches.subcommand_name() {
      app.find_subcommand(sub).unwrap().clone()
    } else {
      app
    };

    help_parse(&mut flags, subcommand);
    return Ok(flags);
  }

for more reference, this is the custom help subcommand definition:

  Command::new("help")
    .disable_version_flag(true)
    .disable_help_subcommand(true)
    .subcommands(app.get_subcommands().map(|command| {
      Command::new(command.get_name().to_owned())
        .disable_help_flag(true)
        .disable_version_flag(true)
    }))

what may i be missing?

[epage]

Inside of if matches.contains_id("help") { you probably need to add app.build();

[crowlKats]

ah yea it was a .build, but on the second branch. i am not sure why its necessary in the second one but not the first 🤔

[epage]

If you use get_matches_mut, then that lazily builds what is needed for parsing the command-line it came across. If you did something that only needed that partially built state, then that explains it.