Bash script to control the package.json version in js projects

git_hook_package.json

#!/bin/bash
set -o nounset
set -o errexit

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
ORANGE='\033[0;33m'
BLUE='\033[0;34m'
NC='\033[0m'

#This is our develop branch name.
DEVELOP_BRANCH="origin/develop"

#Get the current branch name.
CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)

printf "${BLUE}* Comparing branches *${NC}\n"
printf "* The current branch is: ${GREEN}$CURRENT_BRANCH${NC}\n"
printf "* The develop branch is: ${YELLOW}$DEVELOP_BRANCH${NC}\n"

#Get number of differences.
NUM_CHANGES=$(git diff ${DEVELOP_BRANCH}  -- ./package.json | grep version | wc -l)
printf "\n${BLUE}* Number of changes = ${NC} ${YELLOW}${NUM_CHANGES}${NC} ${BLUE}*${NC}\n\n"

#Check if the package.json version of the develop and the current branches are different
if [ "$NUM_CHANGES" != 2 ]; then
 printf "${RED}😿 - Version has not been changed, push not available 🙀.${NC}\n"
 printf "${RED}Please go to package.json and update the version attribute 🙏.${NC}\n\n"
 exit 1
else
 printf "${GREEN}😎 - Version control OK!! - 😎${NC}\n"
 printf "${GREEN}😜   Git push starting...${NC}\n"
 printf "${GREEN}...${NC}\n\n"
 exit 0
fi