This is a small python script, in the spirit of
clang-format-diff, that takes care of reading a diff, and
running rustfmt with the --file-lines option appropriately.
This is intended to allow projects to incrementally adopt rustfmt, without massive patches.
To format your last git commit, for example:
$ git diff HEAD~ | python rustfmt-format-diff.py -p 1
Right now this is pretty much as fine-grained as it could be, but rustfmt isn't (see rust-lang/rustfmt#1835).
With that fixed, the idea is to use it in bindgen, and then ideally Servo, to get consistent formatting across the board without much disruption. Ideally even as a commit hook.