Terrible idea: vimrc in Ruby

vimrc.rb

# A terrible idea
# Spent a couple minutes experimenting with the idea of using Ruby to initialize
# my Vim session instead of something reliable, like a .vimrc. 
#
# Why? Because I love terrible ideas. 
# BTW - only works for the simplest of options right now.
class VimSession
  include VIM
  
  def initialize &options
    instance_eval &options
  end
  
  def set setting, *values
    if values.empty?
      option_str = setting.to_s
    else
      value = values.join ','
      option_str = "#{setting}=#{value}"
    end
    
    set_option option_str
  end
  
  def filetype *flags
    command "filetype #{flags.join(' ')} on"
  end
end

$vim_session = VimSession.new do
  set :nocompatible
  set :shiftwidth, 2
  set :expandtab
  set :number
  filetype :plugin, :indent
end

# and off in the .vimrc
#
#    ruby << END_INIT
#      require "#{ENV['HOME']}/vimrc.rb"
#    END_INIT