Pre commit hook for rails app. put this inside .git

pre-commit.sh

#!/bin/sh
# this hook is in SCM so that it can be shared
# to install it, create a symbolic link in the projects .git/hooks folder
#
#       i.e. - from the .git/hooks directory, run
#               $ ln -s ../../git-hooks/pre-commit.sh pre-commit
#
# to skip the tests, run with the --no-verify argument
#       i.e. - $ 'git commit --no-verify'
FILES='(js|css|rb)'
FORBIDDEN='(binding.pry|console.log|\!important|focus\: true)'
GREP_COLOR='4;5;37;41'

if [[ $(git diff --cached --name-only | grep -E $FILES) ]]; then
  git diff --cached --name-only | grep -E $FILES | \
  xargs grep --color --with-filename -n -E $FORBIDDEN && \
  echo "Looks like you are trying to commit something you shouldn't.  Please fix your diff, or run 'git commit --no-verify' to skip this check, if you must." && \
  exit 1
fi

exit 0