[tessierashpool]

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.

[Groxx]

Yeah, this has been my experience too. Easily confused by common constructions in some codebases, and that can make it almost completely useless. I would happily sacrifice a lot of speed to get a difftastic level of precision.