Simple mail merges in Ruby

module Mergeable
  def merge(text)
    q = %(")
    s = %(\\)
    text = text.dup
    text.gsub!('#{', '#{self.')
    
    #sanitize
    text.gsub!(/#\{([^}]*)([^}\w\.])([^}]*)\}/, '')
    
    text.gsub!(q, s+q)
    eval(q + text + q)
  end
end

require 'ostruct'

# Could be an ActiveRecord Model instead

class MergeStruct < OpenStruct 

  include Mergeable

end

person = MergeStruct.new({"first_name" => "Kyle", "last_name" => "Maxwell"})

letter = '

Subject: Self-affirmation

Dear #{first_name},

You are cool.

  

Sincerely,

#{first_name} #{last_name}'.strip

puts person.merge(letter)