Git pre-commit hook that checks for open application

I am using git to manage a project that has a few binary files that need to be closed before being committed. So I need a git hook, that checks to see if the application that has these files open is running.

My thought was to use osascript like this

#!/usr/bin/env osascript

tell application "System Events"
    set apps to the name of every process whose background only is false
    -- check if apps contains the target application
    -- show a message and exit with non zero status if it does
    -- otherwise exit with 0
end tell

but I am not having much luck. How could I make this work as a git pre-commit hook?