plugins.rb

require 'rubygems'

class Hiera
  module Backend
    module Eyaml
      class Plugins
        @@plugins = []
        @@commands = []
        @@options = []

        def self.register_options(args)
          options = args[:options]
          plugin = args[:plugin]
          options.each do |name, option_hash|
            new_option = { name: "#{plugin}_#{name}" }
            new_option.merge! option_hash
            @@options << new_option
          end
        end

        def self.options
          @@options
        end

        def self.find
          gem_version = Gem::Version.new(Gem::VERSION)
          this_version = Gem::Version.create(Hiera::Backend::Eyaml::VERSION)
          index = (gem_version >= Gem::Version.new('1.8.0')) ? Gem::Specification : Gem.source_index

          [index].flatten.each do |source|
            specs = (gem_version >= Gem::Version.new('1.6.0')) ? source.latest_specs(true) : source.latest_specs

            specs.each do |spec|
              spec = spec.to_spec if spec.respond_to?(:to_spec)
              next if @@plugins.include? spec

              dependency = spec.dependencies.find { |d| d.name == 'hiera-eyaml' }
              next if dependency && !dependency.requirement.satisfied_by?(this_version)

              file = if gem_version >= Gem::Version.new('1.8.0')
                       spec.matches_for_glob('**/eyaml_init.rb').first
                     else
                       Gem.searcher.matching_files(spec, '**/eyaml_init.rb').first
                     end

              next unless file

              @@plugins << spec
              load file
            end
          end

          @@plugins
        end

        def self.plugins
          @@plugins
        end

        def self.commands
          @@commands
        end
      end
    end
  end
end