git precommit hook to warn about ruby puts statements

gistfile1.sh

# thanks to http://codeinthehole.com/writing/tips-for-using-a-git-pre-commit-hook/
FILES_PATTERN='\.rb'
FORBIDDEN='puts '
git diff --cached --name-only | \
    grep -E $FILES_PATTERN | \
        GREP_COLOR='4;5;37;41' xargs grep --color --with-filename -n $FORBIDDEN && \
        echo 'COMMIT REJECTED Found "$FORBIDDEN" references. Please remove them before commiting' && \
        exit 1