make rails application for local rails version option [-m] is use MongoDB ( gem 'mongoid')

make_rails_app.bash

#!/bin/bash

# MongoDB
mongodb=false

# option
while getopts ":m" opt; do
  case $opt in
    m  ) mongodb=true ;;
    \? ) echo "Usage: \"$0 [-m] #application_name#\" " 
         exit 1
  esac
done

shift $(($OPTIND - 1))



# check parameter count
if [ $# -eq 0 ]; then 
  echo "Usage: \"$0 [-m] #application_name#\" " 1>&2
  exit 1
fi

# application name
app=$1

# make app dir
mkdir ${app} || { echo "error : can not mkdir" ; exit 1 ; }
cd ${app} || { echo "error : can not cd" ; exit 1 ; }

# create Gemfile
cat << EOS > Gemfile
source "http://rubygems.org"
gem "rails"
EOS

# install local rails
bundle install --path vendor/bundle

# create new application
if [ $mongodb = true ] ; then
  bundle exec rails new ${app} --skip-bundle --skip-active-record
else
  bundle exec rails new ${app} --skip-bundle
fi

# delete 
rm Gemfile
rm Gemfile.lock

# move to above dir
mv -f ${app}/* .
mv -f ${app}/.gitignore .
rm -rf ${app}


# MongoDB need other gem
if [ $mongodb = true ] ; then
  cat << EOS >> Gemfile
gem 'mongoid'
gem 'bson_ext'
EOS

fi

# install gem
bundle install --path vendor/bundle

# add ignore
echo '/vendor/bundle' >> .gitignore


exit 0