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require 'erb' def madlib(str, &block) madlibber = Class.new do attr_reader :vars, :story def initialize(story) @vars = {} @story = story end %w{name animal verb adjective thing name2 name3}.each do |var| class_eval <<-EOR def #{var}(val) vars[:#{var}] = val end EOR end def to_s vars.each_pair do |name, value| instance_variable_set("@#{name}".to_sym, value) end ERB.new(story).result(binding) end end m = madlibber.new(str) m.instance_eval(&block) m.to_s end story = <<EOS <%= @name %> said: "Now you just fought one hell of a <%= @animal %> And I know you hate me, and you got the right To <%= @verb %> me now, and I wouldn't blame you if you do. But ya ought to thank me, before I die, For the gravel in ya guts and the spit in ya eye Cause I'm the <%= @adjective %> that named you "Sue.'" I got all choked up and I threw down my <%= @thing %> And I called him my pa, and he called me his son, And I came away with a different point of view. And I think about him, now and then, Every time I try and every time I win, And if I ever have a son, I think I'm gonna name him <%= @name2 %> or <%= @name3 %>! Anything but Sue! I still hate that name! EOS str = madlib(story) do name 'Alistair' animal 'duck' verb 'tickle' adjective 'fellow' thing 'spatula' name2 'Horace' name3 'Cynthia' end puts str

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