Git pre-commit hook to execute rubocop

rubocop_git_hook_pre_commit.rb

#!/bin/sh

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[0;33m'
NC='\033[0m'

# Check if rubocop is installed
rubocop -v >/dev/null 2>&1 || { echo >&2 "${RED}[Ruby Style][Fatal]: Install rubocop in your project or system"; exit 1; }

# Get only staged files
FILES="$(git diff --cached --name-only --diff-filter=AMC | grep "\.rb$" | tr '\n' ' ')"

echo "${GREEN}[Ruby Style][Info]: Checking Ruby Style${NC}"

if [ -n "$FILES" ]
then
  echo "${GREEN}[Ruby Style][Info]: ${FILES}${NC}"

  if [ ! -f .rubocop.yml ] && [ ! -f ~/.rubocop.yml ]; then
    echo "${YELLOW}[Ruby Style][Warning]: No .rubocop.yml nor ~/.rubocop.yml config file.${NC}"
  fi

  # Run rubocop on staged files
  rubocop ${FILES}
  
  if [ $? -ne 0 ]; then
    echo "${RED}[Ruby Style][Error]: Fix the issues and commit again${NC}"
    exit 1
  fi
else
  echo "${GREEN}[Ruby Style][Info]: No files to check${NC}"
fi