New OS X machine setup for Ruby/Rails development

rails-install.sh

#!/bin/sh
# Purpose: setup new OS X machine for Ruby/Rails development
# Pre-Requirements: GCC (https://github.com/kennethreitz/osx-gcc-installer)
# Usage: bash < <(curl -fsSkL https://raw.github.com/gist/4169434/rails-install.sh)

RUBY_VERSION="1.9.3-p327"

if [[ `which gcc` == "" ]]; then
  echo "[E] Please install GCC first. Exiting."  
  exit 1
fi

if [ ! -e /usr/local/bin/brew ]; then
  # we need write permissions for 'brew'. This will also ask for password
  sudo chown -R `whoami` /usr/local

  echo "[*] Installing Homebrew..."
  rm -rf /usr/local/Cellar /usr/local/.git && brew cleanup
  ruby -e "$(curl -fsSkL raw.github.com/mxcl/homebrew/go)"
  brew doctor
fi

echo "[*] Installing some utilities..."
brew update
brew install curl wget git
brew install git-flow autoconf automake colordiff ctags
brew install sqlite imagemagick libxml2 libxslt readline node.js

echo "[*] Installs Ruby-${RUBY_VERSION} ..."
brew install ruby-build rbenv

if [ ! -d ${HOME}/.rbenv ]; then
  cat >> ${HOME}/.bash_profile <<DELIM
# ---[ RBENV start ]---
export RUBY_HEAP_MIN_SLOTS=1000000
export RUBY_HEAP_SLOTS_INCREMENT=1000000
export RUBY_HEAP_SLOTS_GROWTH_FACTOR=1
export RUBY_GC_MALLOC_LIMIT=100000000
export RUBY_HEAP_FREE_MIN=500000

export RBENV_ROOT="\${HOME}/.rbenv"

if [ -d "\${RBENV_ROOT}" ]; then
  export PATH="\${RBENV_ROOT}/bin:\${PATH}"
  eval "\$(rbenv init -)"
fi
# ---[ RBENV end ]---
DELIM
  source ${HOME}/.bash_profile

  curl https://raw.github.com/gist/1688857/2-${VERSION}-patched.sh > /tmp/${RUBY_VERSION}
  CFLAGS="-O3" rbenv install /tmp/${RUBY_VERSION}
  rbenv global ${RUBY_VERSION}
  rbenv rehash

  # Cleanup
  rm -rf /tmp/${RUBY_VERSION} /tmp/ruby-*
fi

# TODO: some dotfiles install

echo "[*] Installing Rails..."
gem install bundler rails --no-ri --no-rdoc

echo "[*] Installing Pow..."
curl get.pow.cx | sh
gem install powder --no-ri --no-rdoc
rbenv rehash

echo "[*] DONE."
exit 0