I haven’t touched any Ruby in quite some time. I posted a comment to the rouge issue. If anyone has any experience with rouge, or porting a pygments lexer to rouge, might be useful if you popped over and commented on the rouge issue. Would be nice for gitlab to syntax-highlight Haxe code!
There’s a PR with small whitespace issues (I forgot to make another PR against this PR), but I am not sure it is really correct either (seeing === and !== there seems strange, and I don’t think it handles new syntax from haxe 4).
At least this should provide a good starting point to have haxe highlighting (if not perfect) in gitlab.