How to add additional "generator" commands?

Description

I am looking to extend the ChefDK generator so that we can do things like chef generate library helpers which will generate the libraries directory and the libraries/helper.rb file with all of our standard boiler plate and the standard module layout we use for Coobook Libraries.

ChefDK Version

working with 1.6.1, but have confirmed this in a current 2.4 ChefDK

Platform Version

CentOS 6.9, but confirmed on other platforms as well.

Replication Case

Have attempted to add the following to .chef/knife.rb (though not all at once)

if defined?(ChefDK)
  puts 'this is a test'
  chefdk.send(:generator, :xxxxxxx, :MyLibrary, "generate my lib")
end

...

ChefDK::Command::Generate.send(:generator, :library4, :MyLibrary3, "Generate a libarray!")

...

require_relative './test_gen'
require 'chef-dk/generator'
include ChefDK::Generator::Context
include ChefDK::Command::Generate
include ChefDK::Command::MyGenerate
generator(:xxxxxxxx, :MyLibrary, "generate my lib")

...

before do
  ChefDK::Command::Generate.send(:generator, :library, :MyLibrary, "generate my lib")
  ChefDK::Generator::Context.add_attr(:zzzzzzzz)
  ChefDK::Generator::Generate.class_eval{ generator(:yyyyyy, :MyLib, 'whatever') }
end

...

# Following the Nordstrom Julia Pattern:  https://github.com/Nordstrom/chefdk-julia/blob/master/lib/chefdk/julia.rb
# Created: lib/chefdk/addcommands.rb
Module ChefDK
  Module AddCommands
    require ChefDK::Command::Generate

    generator(:xxxxxxx, :MyLibrary, "generate my lib")
    ChefDK::Command::Generate.generator(:yyyyyyyyy, :MyLib, "yyyyyyyyyyyyyy")

    def self.path
      File.expand_path(File.join(File.dirname(__FILE__), *%w(.. ..)))
    end
  end
end

# then generated a gem, installed it and included the following in knife.rb

if defined?(ChefDK)
  require 'chefdk/AddCommands'
  chefdk.generator_cookbook ChefDK::AddCommands.path
end

...

# in same gem, created lib/chefdk/command/generate.rb
module ChefDK
  module Command
    class Generate < Base

     generator(:xxxxxxx, :MyLibrary, "generate my lib")

    end
  end
end

When I run chef generate I would expect to see xxxxxxx or library or yyyyyyyy as options, and if not displayed there, be able to run chef generate xxxxxxx and have it load my library.

If I edit /opt/chefdk/embedded/lib/ruby/gems/2.3.0/gems/chef-dk-1.6.1/lib/chef-dk/command/generate.rb

I am able to add

generator(:xxxxxxx, :MyLibrary, "generate my lib")

And then run chef generate and see my xxxxxxx option. (That then tries to load ChefDK::Command::GeneratorCommands::MyLibrary, which I think is a whole other problem and, I think, easily dealt with if you create a lib/chefdk/command/generator_commands/my_library.rb and require_relative...)

Stacktrace

Not really applicable as no error message is generated.

Start by tracing the generator registration in lib/chef-dk/command/generate.rb and compare it with the extension pattern in chefdk-julia's lib/chefdk/julia.rb. Review the attempted knife.rb and generator_commands integration described in the issue. Done means a documented extension path lets a custom command appear in chef generate help and run without editing the installed gem.