(Option to) Print only lines that should be improved

[sdasda7777]

When using style50 while completing CS50's psets, I noticed that it is somewhat difficult to identify one or two style problems when complete file is printed (I believe in one problem the resulting file was about 300 lines).

Could it be possible to (add option to) print only lines (or snippets) that could be improved? From technical standpoint I think it shouldn't be that difficult, right?

I would definitely be interested in contributing on improving this situation, if this seems like a good feature to you.