update.sh

# Install Command Line Tools (Xcode) if it isn't already installed.
if type xcode-select >&- && xpath=$(xcode-select --print-path) && test -d "$xpath" && test -x "$xpath" ; then
  # TODO: Reverse if statement logic to remove unnecessary logic.
else
  xcode-select --install
fi

# Install Homebrew (Package Manager) if it isn't already installed.
if ! brew_location="$(type -p brew)" || [ -z "$brew_location" ]; then
  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
  
  # Prepare installation for use
  brew doctor
fi

# Install the RVM (Ruby Version Manager) if it doesn't exist
# If it does, update it and install the latest version of Ruby

if ! rvm_location="$(type -p rvm)" || [ -z "$rvm_location" ]; then
  # Download RVM and install it
  curl -L https://get.rvm.io | bash -s stable --ruby

  # Load RVM into shell
  source ~/.rvm/scripts/rvm
  
  # Install latest version of Ruby (and set it as default version)
  rvm use ruby --install --default
else 
  # Upgrade RVM to the latest stable version
  rvm get stable
  
  # Install latest version of Ruby (and set it as default version)
  rvm use ruby --install --default
fi