clang-format: Add capability to format the diff on save in vim.

With this patch, one can configure a BufWrite hook that will make the
clang-format integration compute a diff of the current buffer with the file
that's on disk and format all changed lines. This should create a
zero-overhead auto-format solution that doesn't require the file to
already be clang-format clean to avoid spurious diffs.

Review: https://reviews.llvm.org/D32429

git-svn-id: svn://svn.chromium.org/llvm-project/cfe/trunk/tools/clang-format@305665 0b72dbe1-c17f-4bc7-b9db-2b4152be0356
1 file changed