This is a simple tool that can be called by git-diff to detect line moves. By default it outputs the number of added and removed lines, similarly to the output of git diff --numstat, but does not report moved lines as added or removed. It can also output an (unsorted) list of lines, similar to the output of plain git diff by setting the environment variable HECKEL_DIFF_LINES.
The project is mostly based on the C++ library developed by Rowun Giles. According to him, this was inspired by IGListKit (https://github.com/Instagram/IGListKit), and based on Paul Heckel's linear time diffing paper (http://documents.scribd.com/docs/10ro9oowpo1h81pgh1as.pdf).
cmake -H. -Bbuild -DCMAKE_BUILD_TYPE=Release && cd build && make installGIT_EXTERNAL_DIFF=heckel-diff-stat git diff ...
The Algorithm<T> currently accepts std::string, size_t and uint32_t
vi heckel-diff-stat/heckel-diff-stat.cpp(or favourite editor) and do your modifications
The tests have a wall_clock and cpu_clock (TEST(HeckelDiff, Benchmark)) test set to expect 1600 diffs to run in no greater than wall_clock 16.67ms (60fps). You may have to adjust this as your computer requires.
The project uses some of the non NSIndexPath test conditions from IGListKit (https://github.com/Instagram/IGListKit).
CPPLint.cfg is available.