rustfmt --config-help should not display hidden options

[nrc]

such as width_heuristics.

reported in #2299

[choubacha]

@nrc How do we know which options are hidden?

[nrc]

@kbacha there are some comments in config.rs, iirc, it's only like three options

[vishalsodani]

I would like to take a shot at this. I see 3 options verbose, file_lines and width_heuristics mentioned under "not user facing".

I have attempted to hide these 3 options on running 'config-help' by modifying print_docs(). I added a vector -
let bypass = vec!["verbose", "file_lines", "width_heuristics"];
and just checked
if !bypass.contains(&name_raw)

Is this the way to go?

[nrc]

@vishalsodani sorry for the late reply, I think that approach is fine, however, I would make bypass a const in config.rs, rather than a local variable (which means using an array, rather than Vec).

[vishalsodani]

@nrc Thanks! Do I need to write test for this change? If yes, where or how do I go about writing the test?

[nrc]

@vishalsodani nah, I don't think this needs a test