Git pre-commit hook to ensure your changes don't break rustfmt formatting rules

rustfmt-git-hook

#!/bin/sh                                                                                                                                                                           

for FILE in `git diff --cached --name-only`; do
    if [[ $FILE == *.rs ]] && ! rustfmt --write-mode diff --skip-children $FILE; then
        echo "Commit rejected due to invalid formatting of \"$FILE\" file."

        exit 1
    fi
done

Nice!

iirc, the [[ construct is bash specific and might not be supported in all variants of /bin/sh.