how to pass all open windows to command line in vim [closed]

Question

I want to run clang-format on all open windows.

What I currently do, is:

• for each open window:
  • :!clang-format --style=file -i %

I have 2 issues:

1. the clang-format runs in shell, so it doesn't return to Vim until I press ENTER - how can I fix that? (tried fiddeling with terminal but couldn't make it work
2. How to run this on all open windows / all git diff-ed files? (I have a shell script I would very much like to bind to a Vim shortcut

clang-format shell script:

# unstaged
for FILE in $(git diff --name-only --relative)
do
    clang-format --style=file -i $FILE
done

# staged
for FILE in $(git diff --cached --name-only --relative)
do
    clang-format --style=file -i $FILE
done