[chef] help abstracting WET code to methods in a library cookbook

Greetings Chefizens,

I'm trying to abstract some WET code I have sprinkled around several of my
recipes into a library. I'm trying to define a method in a "library cookbook",
and use that method in a different cookbook. But I'm failing. Below I show a 
few
techniques I'm trying. The examples below are contrived and very simple --
I want to start simple and actually get it, before I try more abstractions
layered on top (say, LWRP).

Docs I'm reading in an attempt to teach myself how to wield library cookbooks 
in
this manner:

[1] http://stackoverflow.com/questions/15595144/dry-within-a-chef-recipe
[2] 
http://stackoverflow.com/questions/17333486/how-do-i-share-code-across-chef-cookbooks-in-a-chef-repo
[3] 
http://www.opscode.com/blog/2013/09/04/demystifying-common-idioms-in-chef-recipes/
[4] 
http://dougireton.com/blog/2012/12/16/how-to-include-the-windows-cookbook-helper-methods-in-your-chef-recipe/
[5] http://docs.opscode.com/essentials_cookbook_libraries.html


All of my attempts result in:

  Recipe Compile Error in /var/cache/chef/cookbooks/hoosier/recipes/default.rb
  NameError
  uninitialized constant Chef::Recipe::Urmom


And so:

The cookbook "urmom" has a "halper" library: 
cookbooks/urmom/libraries/halper.rb:

  module Halper
    def saywhat
      return "urmom"
    end
  end


The cookbook "hoosier" has a dependency set in metadata.rb on "urmom". It is 
in
hoosier's default recipe that I'm trying these tests.

  foo = Urmom::Halper.saywhat
  Chef::Log.debug("HIGGS-BOSON: result: #{foo}")

I run it: chef-client -l debug -L /var/log/chef/client.log -o 
"recipe[hoosier]"


This technique is how I understood what [1] is saying.



Next I try this in recipe[hoosier::default], based on [3] and [4]:

  ::Chef::Recipe.send(:include, Urmom::Halper)
  foo = Urmom::Halper.saywhat
  Chef::Log.debug("HIGGS-BOSON: result: #{foo}")



Next I try:

  extend Urmom::Halper
  foo = Urmom::Halper.saywhat
  Chef::Log.debug("HIGGS-BOSON: result: #{foo}")



Last, I change the Halper library, per Ranjib Dey's comment in [3]:

  class Chef::Recipe::Halper
    def saywhat
      return "urmom"
    end
  end


The calling recipe is still:

  foo = saywhat
  Chef::Log.debug("HIGGS-BOSON: result: #{foo}")



Any help graciously accepted :>
kallen