Post-merge check for Rails things (migrations, gems, yarn packages)

post-merge.bash

#!/bin/bash

# https://gist.github.com/petitJAM/7f3cb7de846cbe1878d1f8b2945e03e2

DIFF=`git diff --name-only HEAD@{1} HEAD`

YARN=`expr "$DIFF" : ".*package\.json.*"`
MIGRATE=`expr "$DIFF" : ".*db/migrate.*"`
BUNDLE=`expr "$DIFF" : ".*Gemfile*"`

BLINK='\e[5m'
RED='\033[0;31m'
NC='\033[0m' # No Color

if [ ! "$BUNDLE" -eq 0 ] || [ ! "$MIGRATE" -eq 0 ] || [ ! "$YARN" -eq 0 ]
then
  echo -e "${BLINK}Hey! Listen!"
fi

if [ ! "$BUNDLE" -eq 0 ]
then
  echo -e "${RED}There are changes in the Gemfile! Run 'bundle install'${NC}"
fi

if [ ! "$MIGRATE" -eq 0 ]
then
  echo -e "${RED}There are new migrations! Run 'rails db:migrate'${NC}"
fi

if [ ! "$YARN" -eq 0 ]
then
  echo -e "${RED}There are new JavaScript dependencies! Run 'yarn install'${NC}"
fi

This goes in .git/hooks/post-merge.