super simple not well tested erb renderer.

puppet_erb_render.rb

require 'optparse'
require 'yaml'
require 'erubis'

options = {}

opt_parser = OptionParser.new do |opt|
  opt.banner = "Usage: erb_renderer -c config.yml -f file.erb"
  opt.on("-c", "--config FILE", "config file to use for data") do |conf|
    options[:config] = conf
  end
  opt.on("-f", "--file FILE", "erb file to render") do |ef|
    options[:template] = ef
  end
end

opt_parser.parse!

conf = YAML::load_file(options[:config])
conf = Hash[conf.map {|k, v| ["@" + k, v] }]

puts Erubis::Eruby.new(File.open(options[:template], 'r').read).result(conf)