Git pre-commit to check for mistakes

pre-commit

#!/usr/bin/env bash
# vi:syntax=sh

check_for="(binding.pry|byebug)"
ignore_files="(Gemfile|Gemfile.lock)"

files_to_check=$(git diff-index --name-only HEAD -- | grep -Ev "^${ignore_files}$")

matches=$(grep -E "${check_for}" $files_to_check)
if [ ! -z "${matches}" ]; then
  echo "========================================================================"
  echo "Bad commit matches:"
  echo "${matches}"
  echo "Aborting commit!"
  echo "========================================================================"
  exit 1
fi