Luajit FFI bindings to FZY.

make

luajit benchmark.lua

Results:

Lines: 100000

Native:
 -> Total: 34130
 -> Time:  69.418 ms
Original:
 -> Total: 34130
 -> Time:  835.683 ms

The C version of fzy in that repo contains 2 differences with the original:

• the functions take a is_case_sensitive additional parameters that does what you think. It's a parameter rather than computed in the function because for our use-case, you want to compute is_case_sensitive once for needle, instead of on each iteration of the loop.
• match_positions uses uint32_t for positions, because size_t (uint64_t) doesn't map well to lua types.

The fzy algorithm requires that you call fzy.has_match(string, needle) to prefilter all your matches. Only after that is done you can call the other functions such as fzy.positions(string, needle).