Gem exposes `githl` binary that allows to perform line count / contributor at current HEAD. Running on dirty working tree will produce git errors. Binary has a couple of options: `-p` or `--path` specifies relative path, defaults to `.`; `-i` or `--include` specify included files/directories or file extensions; `-e` or `--exlude` specify exluded files/directories or file extensions; `-v` or `--version` prints version. Currently does not work with non-UTF-8 encoded files.