Sadly, I haven't been able to figure out how to get the mbox file from this tread into gmail, but wanted to report a parsing issue I've found with the builtin difftool. Original Patch: https://public-inbox.org/git/ac91e4818cfb5c5af6b5874662dbeb61cde1f69d.1480019834.git.johannes.schindelin@xxxxxx/#t > + *status = *++p; > + if (!status || p[1]) > + return error("unexpected trailer: '%s'", p); > + return 0; The p[1] null check assumes the status is only one character long, but git-diff's raw output format shows that a numeric value can follow in the copy-edit and rename-edit cases. I'm looking forward to seeing the builtin difftool land. I came across it while investigating adding --submodule=diff (expanding on diff's recent addition) support and this looks more promising then the perl script. Hopefully I will make some progress. Any tips/pointers would be greatly appreciated. Thanks