Redmine

module Redmine

  module Hook

    HOOKS = %w(issue_show project_member_list_header project_member_list_row).collect {|h| h.to_sym}

    @@listener_classes = []

    @@listeners = nil

    @@hook_listeners = {}

    class << self

      def add_listener(klass)

        @@listener_classes << klass

      end

      def listeners

        @@listeners ||= @@listener_classes.collect {|listener| listener.instance}

      end

      def hook_listeners(hook)

        @@hook_listeners[hook] ||= listeners.select {|listener| listener.respond_to?(hook)}

      end

      def call_hook(hook, context={})

        response = ''

        hook_listeners(hook).each do |listener|

          response << listener.send(hook, context).to_s

        end

        response

      end

    end

    class Listener

      include Singleton

      def self.inherited(child)

        Redmine::Hook.add_listener(child)

        super

      end

    end

    class ViewExtensionListener < Listener

      include ERB::Util

      include ActionView::Helpers::TagHelper

      include ActionView::Helpers::FormHelper

      include ActionView::Helpers::FormTagHelper

      include ActionView::Helpers::FormOptionsHelper

      include ActionView::Helpers::JavaScriptHelper

      include ActionView::Helpers::PrototypeHelper

      include ActionView::Helpers::NumberHelper

      include ActionView::Helpers::UrlHelper

      include ActionController::UrlWriter

      include ApplicationHelper

    end

    module Helper

      def call_hook(hook, context={})

        Redmine::Hook.call_hook(hook, context)

      end

    end

  end

end

ApplicationHelper.send(:include, Redmine::Hook::Helper)