Work in progress for a rails 4 instalation script using bundler for Mac/Linux systems

install_rails_4

TMP_DIR="/tmp/installing_rails_4"
USER_BIN_DIR="~/bin"
curr=`pwd`

if [ -d "$TMP_DIR" ]; then
  rm -rf $TMP_DIR
fi

mkdir $TMP_DIR
cd $TMP_DIR

bundle init

echo "source :rubygems" >> Gemfile
echo "gem 'rails', :git => 'git://github.com/rails/rails.git'" >> Gemfile
echo "gem 'uglifier', '>= 1.0.30'" >> Gemfile
echo "gem 'activerecord-deprecated_finders', :git => 'git://github.com/rails/activerecord-deprecated_finders.git'" >> Gemfile
echo "gem 'journey', :git => 'git://github.com/rails/journey.git'" >> Gemfile

echo "Finished creating Gemfile, starting instalation..."

bundle install

if [ ! -d "$USER_BIN_DIR" ]; then
  mkdir $USER_BIN_DIR
fi

echo "`bundle show rails`/railties/bin/rails $*" >> $USER_BIN_DIR/rails4
chmod 755 $USER_BIN_DIR/rails4
echo "export PATH=$USER_BIN_DIR:$PATH" >> ~/.bash_rc

cd $curr

rm -Rf /tmp/installing_rails_4

echo "Now you can use rails 4 by the command rails_4_beta"