setup antigen and zsh

my_zsh_setup.sh

#!/bin/bash

# assuming brew installed, especially git

mkdir ~/.zsh-antigen
cd ~/.zsh-antigen
git init .
git submodule add https://github.com/zsh-users/antigen.git antigen

# should check zshrc already exists
cat > "~/.zshrc" <<EOF
ZSHA_BASE=$HOME/.zsh-antigen
source $ZSHA_BASE/antigen/antigen.zsh

antigen use oh-my-zsh

antigen bundles <<EOBUNDLES
git
rsync
npm
rake
rvm
bundler
zsh-users/zsh-completions src
zsh-users/zsh-syntax-highlighting
command-not-found
history
z
djui/alias-tips
coffee
gradle
grails
brew
brew-cask
gem
osx
docker
boot2docker
yerinle/zsh-gvm
johnhamelink/rvm-zsh
unixorn/autoupdate-antigen.zshplugin
EOBUNDLES

# antigen theme bira
antigen theme superjarin

antigen apply
EOF

TEST_CURRENT_SHELL=$(expr "$SHELL" : '.*/\(.*\)')
if [ "$TEST_CURRENT_SHELL" != "zsh" ]; then
    echo "\033[0;34mTime to change your default shell to zsh!\033[0m"
    chsh -s $(grep /zsh$ /etc/shells | tail -1)
fi
unset TEST_CURRENT_SHELL

# what these 2 lines do?
env zsh
. ~/.zshrc