git config --global diff.tool vimdiff
git config --global merge.tool vimdiff
git config --global difftool.prompt false
git difftool --tool=vimdiff --no-prompt
vim -p `git diff --name-only`
See reference [2]
[1] https://medium.com/usevim/git-and-vimdiff-a762d72ced86
[2] https://www.rosipov.com/blog/use-vimdiff-as-git-mergetool/