rubocop - script to install rubocop and rubocop-rspec gems before running rubocop

rubocop.sh

# -------
# rubocop
# -------
# example usage:
#   check a directory:     rubocop app/controllers
#   check a file:          rubocop app/controllers/application_controller.rb
#   check rspec directory: rubycop spec/controllers
#   check rspec file:      rubycop spec/controllers/application_controller_spec.rb
run_rubocop(){
  if gem list | gem list | grep 'rubocop\|rubocop-rspec' ; then
    echo "rubycop and rubocop-rspec gems already installed"

    echo "* Running rubocop"
    rubocop --require rubocop-rspec $@
  else
    echo "* Installing required ruby gems"
    gem install rubocop --no-ri --no-rdoc
    gem install rubocop-rspec --no-ri --no-rdoc

    echo "* Running rubocop"
    rubocop --require rubocop-rspec $@
  fi
}
alias rubocop='run_rubocop $@'