I take it this is for C++? I think this is something that needs to be addressed in with clang format.

Labeling as Build-Tools and cc'ing thakis@ as a best guess for where to triage this.

I thought we had a bug for this already, but I can't find it. dcheng might know what I mean.

clang-format (mostly) just does whitespace adjustment and doesn't add new tokens per original design. I think I also remember someone saying that this is a hard problem for some reason.

This is filed upstream as https://llvm.org/bugs/show_bug.cgi?id=26215. I talked with djasper@ about implementing this, and it's definitely non-trivial. However, if someone's interested in poking at this, I have a few notes from djasper@ about how we could proceed. Otherwise... I'll try to poke at it when I have time, but it probably won't be soon =/

When we implement this, it'd be cool if clang-format could try to infer the {} style for single-line ifs (do they have braces or not) from other ifs in that file and then adapt that style, so that ifs in a file get a consistent style too.