FWIW I am the author of this tool, and I would like to add something that understands syntax (I think I could start with indexing the code using ctags or cscope

FWIW I am the author of this tool, and I would like to add something that understands syntax (I think I could start with indexing the code using ctags or cscope, which is hackish but easy to implement). There's obviously a ton of stuff you could do to improve ranking if you could rank results by whether they're a variable, function, etc.