Build/Hooks/filename.sh

#!/bin/bash

isValidFileName() {
    allownonascii="false"

    if [ "$allownonascii" != "true" ] &&
        test $(git diff --cached --name-only --diff-filter=A -z $1 |
            LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
    then
        return 0
    fi

    return 1
}