[clang] [emacs][clang-format] Add elisp API for clang-format on git diffs (PR #112792)

[Campbell Barton via cfe-commits]

ideasman42 wrote:

> All things considered, I think requiring `vc` is a lot less intrusive than essentially our own `vc` wrapper....

Not sure what you mean exactly by a wrapper, if git/diff logic can be abstracted away - that seems a net gain.
If ugly/fragile logic is required to do that - OK, it's debatable.

Anyway, I was only mentioning that we could consider abstracting away the logic - if it's not practical, there is no need to go into details discussing it, although I did mail the emacs-devel mailing list to check if this might be supported: 



https://github.com/llvm/llvm-project/pull/112792