function check_for_valid_npm () {
  # If NPM is not found, this will return 126 - Command invoked cannot execute
  npm --version >> /dev/null
  return $?
}

function fetchbase () {
  git checkout master && git fetch upstream && git rebase upstream/master && git push origin master;

  if [[ -a ./Gemfile ]]
    then
      read -q "RUN_BUNDLE_INSTALL?Run bundle install (y/n)?"
      if [ "$RUN_BUNDLE_INSTALL" == "y" ]
        then bundle install
      fi
  fi
  if [[ -a ./package.json ]]
    then
      if [[ -a ./yarn.lock ]]
        then
          read -q "RUN_YARN_INSTALL?Run yarn install (y/n)?"
          if [ "$RUN_YARN_INSTALL" == "y" ]
            then yarn install
          fi
      else
        if check_for_valid_npm == 0
          then npm install
        else nvm use stable && npm install
        fi
      fi
  fi
  if [[ -a ./pom.xml ]]
    then
      read -q "RUN_MVN_PACKAGE?Run mvn clean package (y/n)?"
      if [ "$RUN_MVN_PACKAGE" == "y" ]
        then mvn clean package
      fi
  fi
}