Fix #51 - Add support for puppetfile resolver

  * This adds experimental support for the puppetfile resolver.
    Since the resolver is better, faster, stronger it might be
    useful to use this library in the future.  A resolve task
    task has been added but it is not clear what that yet provides.

lib/ra10ke.rb

@@ -3,6 +3,7 @@
 require 'ra10ke/version'
 require 'ra10ke/solve'
 require 'ra10ke/syntax'
+require 'ra10ke/resolver'
 require 'ra10ke/dependencies'
 require 'ra10ke/deprecation'
 require 'ra10ke/duplicates'
@@ -20,6 +21,7 @@ class RakeTask < ::Rake::TaskLib
     include Ra10ke::Duplicates
     include Ra10ke::Install
     include Ra10ke::Validate
+    include Ra10ke::Resolver
 
     attr_accessor :basedir, :moduledir, :puppetfile_path, :puppetfile_name, :force, :purge
 
@@ -41,6 +43,8 @@ def initialize(*args)
         define_task_duplicates(*args)
         define_task_install(*args)
         define_task_validate(*args)
+        define_task_resolver(*args)
+
       end
     end
 

lib/ra10ke/resolver.rb

@@ -0,0 +1,56 @@
+require 'puppetfile-resolver'
+require 'puppetfile-resolver/puppetfile/parser/r10k_eval'
+
+module Ra10ke
+  module Resolver
+
+    def define_task_resolver(*args)
+      desc 'Run the puppetfile Resolver'
+      task :resolver do
+        resolver = Ra10ke::Resolver::Instance.new(get_puppetfile.puppetfile_path)
+        result = resolver.resolve
+        # Output resolution validation errors
+        result.validation_errors.each { |err| puts "Resolution Validation Error: #{err}\n"}
+      end
+    end
+
+    class Instance
+      attr_reader :puppetfile
+
+      def initialize(puppetfile_path = File.expand_path(Dir.pwd))
+
+        # Parse the Puppetfile into an object model
+        content = File.open(puppetfile_path, 'rb') { |f| f.read }
+
+        @puppetfile = ::PuppetfileResolver::Puppetfile::Parser::R10KEval.parse(content)
+
+        # Make sure the Puppetfile is valid
+        unless puppetfile.valid?
+          puts 'Puppetfile is not valid'
+          puppetfile.validation_errors.each { |err| puts err }
+          exit 1
+        end
+      end
+
+      def resolve
+        # Create the resolver
+        # - Use the document we just parsed (puppetfile)
+        # - Don't restrict by Puppet version (nil)
+        resolver = ::PuppetfileResolver::Resolver.new(puppetfile, nil)
+
+        # Configure the resolver
+        cache                 = nil  # Use the default inmemory cache
+        ui                    = nil  # Don't output any information
+        module_paths          = []   # List of paths to search for modules on the local filesystem
+        allow_missing_modules = true # Allow missing dependencies to be resolved
+        opts = { cache: cache, ui: ui, module_paths: module_paths, allow_missing_modules: allow_missing_modules }
+
+        # Resolve
+        result = resolver.resolve(opts)
+
+
+      end
+
+  end
+  end
+end

ra10ke.gemspec

@@ -17,6 +17,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = '>= 2.4.0'
 
   spec.add_dependency "rake"
+  spec.add_dependency 'puppetfile-resolver'
   spec.add_dependency "puppet_forge"
   spec.add_dependency "r10k"
   spec.add_dependency "git"

spec/ra10ke/resolver_spec.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'ra10ke/resolver'
+RSpec::Mocks.configuration.allow_message_expectations_on_nil = true
+
+RSpec.describe 'Ra10ke::Resolver::Instance' do
+  include Ra10ke::Resolver
+  let(:instance) do
+    Ra10ke::Resolver::Instance.new(puppetfile)
+  end
+
+  let(:puppetfile) do
+    File.join(fixtures_dir, 'Puppetfile')
+  end
+
+  it 'resolves the puppetfile' do 
+   expect(instance.resolve).to be nil
+  end
+end