Redmine

  # Use redmine's custom plugin locater

  require File.join(RAILS_ROOT, "lib/redmine_plugin_locator")

  config.plugin_locators << RedminePluginLocator

  class PluginNotFound < StandardError

    attr_reader :plugin_id

    def initialize(plug_id=nil)

      super

      @plugin_id = plug_id

    end

  end

    @deferred_plugins   = {}

      attr_reader :registered_plugins, :deferred_plugins

      begin

        id = id.to_sym

        p = new(id)

        p.instance_eval(&block)

        # Set a default name if it was not provided during registration

        p.name(id.to_s.humanize) if p.name.nil?

        # Adds plugin locales if any

        # YAML translation files should be found under <plugin>/config/locales/

        ::I18n.load_path += Dir.glob(File.join(RAILS_ROOT, 'vendor', 'plugins', id.to_s, 'config', 'locales', '*.yml'))

        registered_plugins[id] = p

        # If there are plugins waiting for us to be loaded, we try loading those, again

        if deferred_plugins[id]

          deferred_plugins[id].each do |ary|

            plugin_id, block = ary

            register(plugin_id, &block)

          end

          deferred_plugins.delete(id)

        end

        return p

      rescue PluginNotFound => e

        if RedminePluginLocator.instance.has_plugin? e.plugin_id

          # The required plugin is going to be loaded later, defer loading this plugin

          (deferred_plugins[e.plugin_id] ||= []) << [id, block]

          return p

        else

          raise e

        end

      end

      registered_plugins[id.to_sym] || raise(PluginNotFound.new(id.to_sym))

class RedminePluginLocator < Rails::Plugin::FileSystemLocator

  def initialize(initializer)

    super

    @@instance = self

  end

  def self.instance

    @@instance

  end

  # This locator is not meant for loading plugins

  # The plugin loading is done by the default rails locator, this one is

  # only for querying available plugins easily

  def plugins(for_loading = true)

    return [] if for_loading

    super()

  end

  def has_plugin?(name)

    plugins(false).collect(&:name).include? name.to_s

  end

end