add rubydeps support for graphing class hierarchy

https://github.com/dcadenas/rubydeps

Gemfile

@@ -4,6 +4,7 @@ source 'https://rubygems.org'
 
 group :test, :development do
   gem 'chefspec', '~> 3.0'
+  gem 'rubydeps'
 end
 
 group :development do

Rakefile

@@ -0,0 +1,47 @@
+IGNORED_CLASSES = ['RSpec::Core::ExampleGroup']
+DUMP_FILE = 'rubydeps.dump'
+DOT_FILE  = 'rubydeps.dot'
+SVG_FILE  = 'rubydeps.svg'
+
+task :default => "rubydeps:svg"
+
+file DUMP_FILE do
+  sh 'RUBYDEPS=y rspec'
+end
+
+file DOT_FILE => DUMP_FILE do
+  ignore_regexp = IGNORED_CLASSES.join "|"
+  sh "rubydeps --class-name-filter='^(?!#{ignore_regexp})'"
+  dot = File.read(DOT_FILE)
+  dot.gsub!('rankdir=LR', 'rankdir=TB')
+  # Unfortunately due to https://github.com/dcadenas/rubydeps/issues/4
+  # we need to manually exclude some superfluous dependencies which
+  # go in the wrong direction.
+  dot.gsub!(/\\\n/, '')
+  dot.gsub!(/^(?=\s+Object )/, '#')
+  dot.gsub!(/^(?=\s+"Pacemaker::Resource::Meta" ->)/, '#')
+  dot.gsub!(/^(?=\s+"Pacemaker::CIBObject" ->)/, '#')
+  dot.gsub!(/^(?=\s+"Chef::Mixin::Pacemaker::StandardCIBObject" -> "(?!Pacemaker::CIBObject))/, '#')
+  dot.gsub!(/^(?=\s+"Chef::Mixin::Pacemaker::RunnableResource" -> "(?!Pacemaker::CIBObject))/, '#')
+  File.open(DOT_FILE, 'w') { |f| f.write(dot) }
+end
+
+file SVG_FILE => DOT_FILE do
+  sh "dot -Tsvg #{DOT_FILE} > #{SVG_FILE}"
+end
+
+namespace :rubydeps do
+  desc "Clean rubydeps dump"
+  task :clean do
+    FileUtils.rm_f([DUMP_FILE])
+  end
+
+  desc "Regenerate #{DUMP_FILE}"
+  task :dump => DUMP_FILE
+
+  desc "Regenerate #{DOT_FILE}"
+  task :dot  => DOT_FILE
+
+  desc "Regenerate #{SVG_FILE}"
+  task :svg  => SVG_FILE
+end

spec/spec_helper.rb

@@ -43,6 +43,11 @@ end
 # FIXME
 #running_guard = ENV['GUARD_NOTIFY'] && ! ENV['GUARD_NOTIFY'].empty?
 
+if ENV['RUBYDEPS']
+  require 'rubydeps'
+  Rubydeps.start
+end
+
 if false # ! running_guard
   at_exit { ChefSpec::Coverage.report! }
 end