it's a fantastic feature in theory. in practice, it's imprecise and error-prone, and I believe these regular expressions are probably why. I hadn't looked at th

it's a fantastic feature in theory. in practice, it's imprecise and error-prone, and I believe these regular expressions are probably why. I hadn't looked at the implementation before, but I approached it from the other end: I set up a bunch of test cases, and I was pretty disappointed. there were two disappointments. first, `git log -L` seems to prioritize tracking blocks of code over lines of code. that's just a design choice I disagree with, so it wasn't a big deal. but it also lost track of lines of code for me quite often, and produced a number of false positives to boot. to be fair, I haven't tried using `diff=LANG` (per a comment below), and that might get more reliable results.