After doing extensive modifications, I'd like to run a validation script to ensure the changes are correct: the changes are not quite trivial to perform mechanically, but are very easy to check.
To do that, I'd like the validation script to be called once per file modified, with the original & modified files as input. git show $REV:$PATH
can probably get partway there (assuming no renames), but I wonder if there's something built in or easily accessible without "brute-forcing" it.