Overall, idutils seems to be a good choice. As compared to a grep based solution, it knows what is code, so it doesn't report on files where the words of interest only occur in comments. As compared to glimpse, it knows that foo_bar is a single word. Indexing is faster than with glimpse, and looking things up in the index is also slightly faster, even though Coccinelle needs to make multiple calls because it doesn't support complex formulas. It does support regexps, which could perhaps be even faster, but since the running time currently is mostly under 1 second and often under .1 seconds, it probably doesn't matter.
julia
