OSX Installer of Homebrew, Rbenv, various homebrew libraries, rbenv plugins, gems, and ruby 1.9.3

osx_installer.sh

#!/usr/bin/env bash
#
# Homebrew & Ruby setup for OSX
#
set -e

# Setup some array's
declare -a brew_libs=(apple-gcc42 openssl readline zlib libxml2 libyaml librsvg libiconv git curl solr wget redis sqlite memcached ack phantomjs mysql node)
declare -a rbenv_plugins=(ruby-build rbenv-vars rbenv-default-gems rbenv-gem-rehash)

install_homebrew() {
  echo "==> Installing Homebrew..."
  if ! which brew > /dev/null; then
    ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"
  fi
}

install_homebrew_libraries() {
  echo "==> Installing Homebrew Libraries..."
  for lib in "${brew_libs[@]}"
  do
    echo "===> Installing ${lib}..."
    brew install $lib
  done

  echo "===> Installing Imagemagick..."
  brew install imagemagick --use-rsvg
}

postgresql_setup() {
  echo "==> Installing & lauching/relaunching PostgreSQL..."
  if ! which psql > /dev/null; then
    brew install postgres --no-python
    initdb /usr/local/var/postgres -E utf8 # only if it's a new install
  fi


  launchctl unload $HOME/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
  launchctl load $HOME/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
}


install_rbenv() {
  echo "==> Installing rbenv to $HOME/.rbenv..."
  git clone git://github.com/sstephenson/rbenv.git $HOME/.rbenv

  echo "===> Adding Rbenv specific configuration to the end of your Shell's profile..."

  # Using bash?
  # write rbenv configuration to the .bash_profile
  if [ -f $HOME/.bash_profile ]; then
    echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> $HOME/.bash_profile
    echo 'eval "$(rbenv init -)"' >> $HOME/.bash_profile
  fi

  # Using ZSH?
  # write rbenv configuration to the .zshrc
  if [ -f $HOME/.zshrc ]; then
    echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> $HOME/.zshrc
    echo 'eval "$(rbenv init -)"' >> $HOME/.zshrc
  fi

  # restart the shell
  exec $SHELL -l
}

install_rbenv_plugins() {
  url=git://github.com/sstephenson
  rbenv_plugin_home=$HOME/.rbenv/plugins

  echo "==> Installing Rbenv plugins..."

  for plugin in "${rbenv_plugins[@]}"
  do
    if [ -d $rbenv_plugin_home/$plugin ]; then
      echo "===> Updating ${rbenv_plugin_home}/${plugin}"
      cd $rbenv_plugin_home/$plugin & git pull & cd -
    else
      echo "===> Installing ${plugin} to ${rbenv_plugin_home}/${plugin}"
      git clone $url/$plugin.git $rbenv_plugin_home/$plugin
    fi
  done
}

install_ruby_versions() {
  version=1.9.3-p429
  if [[ ! -d $HOME/.rbenv/versions/$version ]]; then
    echo "==> Installing Ruby version ${version}..."
    rbenv install $version
    rbenv rehash
    rbenv global $version
  fi

  # update rubygems regardless
  echo "==> Updating RubyGems..."
  gem update --system
}

# write some default gems to the rbenv default list so they can be installed
# with every new ruby the user installs
setup_default_gems() {
  default_gem_home=$HOME/.rbenv/default-gems
  declare -a gems=('bundler --pre' 'minitest' 'foreman' 'powder' 'pry' 'rails' 'sinatra' 'vagrant');

  touch $default_gem_home
  for g in "${gems[@]}"
  do
    grep -w "${g}" $default_gem_home >/dev/null
    if [ $? -eq 1 ]; then
      echo "==> Adding ${g} to ${default_gem_home}"
      echo "${g}" >> $default_gem_home
    fi
  done
}

# install/upgrade pow
install_server() {
  curl get.pow.cx | sh
}

#################################################
# Get this started

# Ask some starting questions
echo I am going to download and install the following libraries:
echo "* Homebrew"
echo "* Rbenv"
echo "* Mysql"
echo "* PostgreSQL"
echo "* SQLite"
echo "* Redis"
echo "* Solr"
echo "* Git"
echo "* Memcached"
echo "* PhantomJS"
echo "* Node.js"
read -p "---> Are you OK with this? (y/n) " answer

if [ "x${answer}" = xY ] || [ "x${answer}" = xy ]; then
  if ! which brew > /dev/null; then
    echo
    echo You do not have Homebrew, a package manager for OSX, on your system
    echo I am going to install it at /usr/local directory
    echo
    echo You can read more about Homebrew here: http://mxcl.github.com/homebrew/

    install_homebrew
    install_homebrew_libraries

  else
    echo "==> I am going to see if your version of
    Homebrew needs an upgrade..."
    brew update
    echo
    echo "==> Going to see if any of your homebrew
    packages need an upgrade..."
    brew upgrade
  fi

  # RBENV
  if ! which rbenv > /dev/null; then
    echo I am going to install Rbenv, a Ruby manager, onto your system
    echo It will be installed at ~/.rbenv, in your local home directory.
    echo
    echo You can read more about rbenv here: https://github.com/sstephenson/rbenv/

    install_rbenv
  else
      echo "==> I am going to see if your rbenv version needs an upgrade..."
      cd $HOME/.rbenv && git pull && cd plugins/ruby-build && git pull && cd -
  fi

  install_rbenv_plugins
  install_ruby_versions
  setup_default_gems
  postgresql_setup
  install_server

else
  echo
  echo Without Homebrew, I cannot proceed.
  exit
fi