Chris@0: # redMine - project management software
Chris@0: # Copyright (C) 2006-2007  Jean-Philippe Lang
Chris@0: #
Chris@0: # This program is free software; you can redistribute it and/or
Chris@0: # modify it under the terms of the GNU General Public License
Chris@0: # as published by the Free Software Foundation; either version 2
Chris@0: # of the License, or (at your option) any later version.
Chris@0: # 
Chris@0: # This program is distributed in the hope that it will be useful,
Chris@0: # but WITHOUT ANY WARRANTY; without even the implied warranty of
Chris@0: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Chris@0: # GNU General Public License for more details.
Chris@0: # 
Chris@0: # You should have received a copy of the GNU General Public License
Chris@0: # along with this program; if not, write to the Free Software
Chris@0: # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
Chris@0: 
Chris@0: require 'tree' # gem install rubytree
Chris@0: 
Chris@0: # Monkey patch the TreeNode to add on a few more methods :nodoc:
Chris@0: module TreeNodePatch
Chris@0:   def self.included(base)
Chris@0:     base.class_eval do
Chris@0:       attr_reader :last_items_count
Chris@0:       
Chris@0:       alias :old_initilize :initialize
Chris@0:       def initialize(name, content = nil)
Chris@0:         old_initilize(name, content)
Chris@0:         @last_items_count = 0
Chris@0:         extend(InstanceMethods)
Chris@0:       end
Chris@0:     end
Chris@0:   end
Chris@0:   
Chris@0:   module InstanceMethods
Chris@0:     # Adds the specified child node to the receiver node.  The child node's
Chris@0:     # parent is set to be the receiver.  The child is added as the first child in
Chris@0:     # the current list of children for the receiver node.
Chris@0:     def prepend(child)
Chris@0:       raise "Child already added" if @childrenHash.has_key?(child.name)
Chris@0: 
Chris@0:       @childrenHash[child.name]  = child
Chris@0:       @children = [child] + @children
Chris@0:       child.parent = self
Chris@0:       return child
Chris@0: 
Chris@0:     end
Chris@0: 
Chris@0:     # Adds the specified child node to the receiver node.  The child node's
Chris@0:     # parent is set to be the receiver.  The child is added at the position
Chris@0:     # into the current list of children for the receiver node.
Chris@0:     def add_at(child, position)
Chris@0:       raise "Child already added" if @childrenHash.has_key?(child.name)
Chris@0: 
Chris@0:       @childrenHash[child.name]  = child
Chris@0:       @children = @children.insert(position, child)
Chris@0:       child.parent = self
Chris@0:       return child
Chris@0: 
Chris@0:     end
Chris@0: 
Chris@0:     def add_last(child)
Chris@0:       raise "Child already added" if @childrenHash.has_key?(child.name)
Chris@0: 
Chris@0:       @childrenHash[child.name]  = child
Chris@0:       @children <<  child
Chris@0:       @last_items_count += 1
Chris@0:       child.parent = self
Chris@0:       return child
Chris@0: 
Chris@0:     end
Chris@0: 
Chris@0:     # Adds the specified child node to the receiver node.  The child node's
Chris@0:     # parent is set to be the receiver.  The child is added as the last child in
Chris@0:     # the current list of children for the receiver node.
Chris@0:     def add(child)
Chris@0:       raise "Child already added" if @childrenHash.has_key?(child.name)
Chris@0: 
Chris@0:       @childrenHash[child.name]  = child
Chris@0:       position = @children.size - @last_items_count
Chris@0:       @children.insert(position, child)
Chris@0:       child.parent = self
Chris@0:       return child
Chris@0: 
Chris@0:     end
Chris@0: 
Chris@0:     # Wrapp remove! making sure to decrement the last_items counter if
Chris@0:     # the removed child was a last item
Chris@0:     def remove!(child)
Chris@0:       @last_items_count -= +1 if child && child.last
Chris@0:       super
Chris@0:     end
Chris@0: 
Chris@0: 
Chris@0:     # Will return the position (zero-based) of the current child in
Chris@0:     # it's parent
Chris@0:     def position
Chris@0:       self.parent.children.index(self)
Chris@0:     end
Chris@0:   end
Chris@0: end
Chris@0: Tree::TreeNode.send(:include, TreeNodePatch)
Chris@0: 
Chris@0: module Redmine
Chris@0:   module MenuManager
Chris@0:     class MenuError < StandardError #:nodoc:
Chris@0:     end
Chris@0:     
Chris@0:     module MenuController
Chris@0:       def self.included(base)
Chris@0:         base.extend(ClassMethods)
Chris@0:       end
Chris@0: 
Chris@0:       module ClassMethods
Chris@0:         @@menu_items = Hash.new {|hash, key| hash[key] = {:default => key, :actions => {}}}
Chris@0:         mattr_accessor :menu_items
Chris@0:         
Chris@0:         # Set the menu item name for a controller or specific actions
Chris@0:         # Examples:
Chris@0:         #   * menu_item :tickets # => sets the menu name to :tickets for the whole controller
Chris@0:         #   * menu_item :tickets, :only => :list # => sets the menu name to :tickets for the 'list' action only
Chris@0:         #   * menu_item :tickets, :only => [:list, :show] # => sets the menu name to :tickets for 2 actions only
Chris@0:         #   
Chris@0:         # The default menu item name for a controller is controller_name by default
Chris@0:         # Eg. the default menu item name for ProjectsController is :projects
Chris@0:         def menu_item(id, options = {})
Chris@0:           if actions = options[:only]
Chris@0:             actions = [] << actions unless actions.is_a?(Array)
Chris@0:             actions.each {|a| menu_items[controller_name.to_sym][:actions][a.to_sym] = id}
Chris@0:           else
Chris@0:             menu_items[controller_name.to_sym][:default] = id
Chris@0:           end
Chris@0:         end
Chris@0:       end
Chris@0:       
Chris@0:       def menu_items
Chris@0:         self.class.menu_items
Chris@0:       end
Chris@0:       
Chris@0:       # Returns the menu item name according to the current action
Chris@0:       def current_menu_item
Chris@0:         @current_menu_item ||= menu_items[controller_name.to_sym][:actions][action_name.to_sym] ||
Chris@0:                                  menu_items[controller_name.to_sym][:default]
Chris@0:       end
Chris@0:       
Chris@0:       # Redirects user to the menu item of the given project
Chris@0:       # Returns false if user is not authorized
Chris@0:       def redirect_to_project_menu_item(project, name)
Chris@0:         item = Redmine::MenuManager.items(:project_menu).detect {|i| i.name.to_s == name.to_s}
Chris@0:         if item && User.current.allowed_to?(item.url, project) && (item.condition.nil? || item.condition.call(project))
Chris@0:           redirect_to({item.param => project}.merge(item.url))
Chris@0:           return true
Chris@0:         end
Chris@0:         false
Chris@0:       end
Chris@0:     end
Chris@0:     
Chris@0:     module MenuHelper
Chris@0:       # Returns the current menu item name
Chris@0:       def current_menu_item
Chris@0:         @controller.current_menu_item
Chris@0:       end
Chris@0:       
Chris@0:       # Renders the application main menu
Chris@0:       def render_main_menu(project)
Chris@0:         render_menu((project && !project.new_record?) ? :project_menu : :application_menu, project)
Chris@0:       end
Chris@0:       
Chris@0:       def display_main_menu?(project)
Chris@0:         menu_name = project && !project.new_record? ? :project_menu : :application_menu
Chris@0:         Redmine::MenuManager.items(menu_name).size > 1 # 1 element is the root
Chris@0:       end
Chris@0: 
Chris@0:       def render_menu(menu, project=nil)
Chris@0:         links = []
Chris@0:         menu_items_for(menu, project) do |node|
Chris@0:           links << render_menu_node(node, project)
Chris@0:         end
Chris@0:         links.empty? ? nil : content_tag('ul', links.join("\n"))
Chris@0:       end
Chris@0: 
Chris@0:       def render_menu_node(node, project=nil)
Chris@0:         if node.hasChildren? || !node.child_menus.nil?
Chris@0:           return render_menu_node_with_children(node, project)
Chris@0:         else
Chris@0:           caption, url, selected = extract_node_details(node, project)
Chris@0:           return content_tag('li',
Chris@0:                                render_single_menu_node(node, caption, url, selected))
Chris@0:         end
Chris@0:       end
Chris@0: 
Chris@0:       def render_menu_node_with_children(node, project=nil)
Chris@0:         caption, url, selected = extract_node_details(node, project)
Chris@0: 
chris@37:         html = [].tap do |html|
Chris@0:           html << '<li>'
Chris@0:           # Parent
Chris@0:           html << render_single_menu_node(node, caption, url, selected)
Chris@0: 
Chris@0:           # Standard children
chris@37:           standard_children_list = "".tap do |child_html|
Chris@0:             node.children.each do |child|
Chris@0:               child_html << render_menu_node(child, project)
Chris@0:             end
Chris@0:           end
Chris@0: 
Chris@0:           html << content_tag(:ul, standard_children_list, :class => 'menu-children') unless standard_children_list.empty?
Chris@0: 
Chris@0:           # Unattached children
Chris@0:           unattached_children_list = render_unattached_children_menu(node, project)
Chris@0:           html << content_tag(:ul, unattached_children_list, :class => 'menu-children unattached') unless unattached_children_list.blank?
Chris@0: 
Chris@0:           html << '</li>'
Chris@0:         end
Chris@0:         return html.join("\n")
Chris@0:       end
Chris@0: 
Chris@0:       # Returns a list of unattached children menu items
Chris@0:       def render_unattached_children_menu(node, project)
Chris@0:         return nil unless node.child_menus
Chris@0: 
chris@37:         "".tap do |child_html|
Chris@0:           unattached_children = node.child_menus.call(project)
Chris@0:           # Tree nodes support #each so we need to do object detection
Chris@0:           if unattached_children.is_a? Array
Chris@0:             unattached_children.each do |child|
Chris@0:               child_html << content_tag(:li, render_unattached_menu_item(child, project)) 
Chris@0:             end
Chris@0:           else
Chris@0:             raise MenuError, ":child_menus must be an array of MenuItems"
Chris@0:           end
Chris@0:         end
Chris@0:       end
Chris@0: 
Chris@0:       def render_single_menu_node(item, caption, url, selected)
Chris@0:         link_to(h(caption), url, item.html_options(:selected => selected))
Chris@0:       end
Chris@0: 
Chris@0:       def render_unattached_menu_item(menu_item, project)
Chris@0:         raise MenuError, ":child_menus must be an array of MenuItems" unless menu_item.is_a? MenuItem
Chris@0: 
Chris@0:         if User.current.allowed_to?(menu_item.url, project)
Chris@0:           link_to(h(menu_item.caption),
Chris@0:                   menu_item.url,
Chris@0:                   menu_item.html_options)
Chris@0:         end
Chris@0:       end
Chris@0:       
Chris@0:       def menu_items_for(menu, project=nil)
Chris@0:         items = []
Chris@0:         Redmine::MenuManager.items(menu).root.children.each do |node|
Chris@0:           if allowed_node?(node, User.current, project)
Chris@0:             if block_given?
Chris@0:               yield node
Chris@0:             else
Chris@0:               items << node  # TODO: not used?
Chris@0:             end
Chris@0:           end
Chris@0:         end
Chris@0:         return block_given? ? nil : items
Chris@0:       end
Chris@0: 
Chris@0:       def extract_node_details(node, project=nil)
Chris@0:         item = node
Chris@0:         url = case item.url
Chris@0:         when Hash
Chris@0:           project.nil? ? item.url : {item.param => project}.merge(item.url)
Chris@0:         when Symbol
Chris@0:           send(item.url)
Chris@0:         else
Chris@0:           item.url
Chris@0:         end
Chris@0:         caption = item.caption(project)
Chris@0:         return [caption, url, (current_menu_item == item.name)]
Chris@0:       end
Chris@0: 
Chris@0:       # Checks if a user is allowed to access the menu item by:
Chris@0:       #
Chris@0:       # * Checking the conditions of the item
Chris@0:       # * Checking the url target (project only)
Chris@0:       def allowed_node?(node, user, project)
Chris@0:         if node.condition && !node.condition.call(project)
Chris@0:           # Condition that doesn't pass
Chris@0:           return false
Chris@0:         end
Chris@0: 
Chris@0:         if project
Chris@0:           return user && user.allowed_to?(node.url, project)
Chris@0:         else
Chris@0:           # outside a project, all menu items allowed
Chris@0:           return true
Chris@0:         end
Chris@0:       end
Chris@0:     end
Chris@0:     
Chris@0:     class << self
Chris@0:       def map(menu_name)
Chris@0:         @items ||= {}
Chris@0:         mapper = Mapper.new(menu_name.to_sym, @items)
Chris@0:         if block_given?
Chris@0:           yield mapper
Chris@0:         else
Chris@0:           mapper
Chris@0:         end
Chris@0:       end
Chris@0:       
Chris@0:       def items(menu_name)
Chris@0:         @items[menu_name.to_sym] || Tree::TreeNode.new(:root, {})
Chris@0:       end
Chris@0:     end
Chris@0:     
Chris@0:     class Mapper
Chris@0:       def initialize(menu, items)
Chris@0:         items[menu] ||= Tree::TreeNode.new(:root, {})
Chris@0:         @menu = menu
Chris@0:         @menu_items = items[menu]
Chris@0:       end
Chris@0:       
Chris@0:       @@last_items_count = Hash.new {|h,k| h[k] = 0}
Chris@0:       
Chris@0:       # Adds an item at the end of the menu. Available options:
Chris@0:       # * param: the parameter name that is used for the project id (default is :id)
Chris@0:       # * if: a Proc that is called before rendering the item, the item is displayed only if it returns true
Chris@0:       # * caption that can be:
Chris@0:       #   * a localized string Symbol
Chris@0:       #   * a String
Chris@0:       #   * a Proc that can take the project as argument
Chris@0:       # * before, after: specify where the menu item should be inserted (eg. :after => :activity)
Chris@0:       # * parent: menu item will be added as a child of another named menu (eg. :parent => :issues)
Chris@0:       # * children: a Proc that is called before rendering the item. The Proc should return an array of MenuItems, which will be added as children to this item.
Chris@0:       #   eg. :children => Proc.new {|project| [Redmine::MenuManager::MenuItem.new(...)] }
Chris@0:       # * last: menu item will stay at the end (eg. :last => true)
Chris@0:       # * html_options: a hash of html options that are passed to link_to
Chris@0:       def push(name, url, options={})
Chris@0:         options = options.dup
Chris@0: 
Chris@0:         if options[:parent]
Chris@0:           subtree = self.find(options[:parent])
Chris@0:           if subtree
Chris@0:             target_root = subtree
Chris@0:           else
Chris@0:             target_root = @menu_items.root
Chris@0:           end
Chris@0: 
Chris@0:         else
Chris@0:           target_root = @menu_items.root
Chris@0:         end
Chris@0: 
Chris@0:         # menu item position
Chris@0:         if first = options.delete(:first)
Chris@0:           target_root.prepend(MenuItem.new(name, url, options))
Chris@0:         elsif before = options.delete(:before)
Chris@0: 
Chris@0:           if exists?(before)
Chris@0:             target_root.add_at(MenuItem.new(name, url, options), position_of(before))
Chris@0:           else
Chris@0:             target_root.add(MenuItem.new(name, url, options))
Chris@0:           end
Chris@0: 
Chris@0:         elsif after = options.delete(:after)
Chris@0: 
Chris@0:           if exists?(after)
Chris@0:             target_root.add_at(MenuItem.new(name, url, options), position_of(after) + 1)
Chris@0:           else
Chris@0:             target_root.add(MenuItem.new(name, url, options))
Chris@0:           end
Chris@0:           
Chris@0:         elsif options[:last] # don't delete, needs to be stored
Chris@0:           target_root.add_last(MenuItem.new(name, url, options))
Chris@0:         else
Chris@0:           target_root.add(MenuItem.new(name, url, options))
Chris@0:         end
Chris@0:       end
Chris@0:       
Chris@0:       # Removes a menu item
Chris@0:       def delete(name)
Chris@0:         if found = self.find(name)
Chris@0:           @menu_items.remove!(found)
Chris@0:         end
Chris@0:       end
Chris@0: 
Chris@0:       # Checks if a menu item exists
Chris@0:       def exists?(name)
Chris@0:         @menu_items.any? {|node| node.name == name}
Chris@0:       end
Chris@0: 
Chris@0:       def find(name)
Chris@0:         @menu_items.find {|node| node.name == name}
Chris@0:       end
Chris@0: 
Chris@0:       def position_of(name)
Chris@0:         @menu_items.each do |node|
Chris@0:           if node.name == name
Chris@0:             return node.position
Chris@0:           end
Chris@0:         end
Chris@0:       end
Chris@0:     end
Chris@0:     
Chris@0:     class MenuItem < Tree::TreeNode
Chris@0:       include Redmine::I18n
Chris@0:       attr_reader :name, :url, :param, :condition, :parent, :child_menus, :last
Chris@0:       
Chris@0:       def initialize(name, url, options)
Chris@0:         raise ArgumentError, "Invalid option :if for menu item '#{name}'" if options[:if] && !options[:if].respond_to?(:call)
Chris@0:         raise ArgumentError, "Invalid option :html for menu item '#{name}'" if options[:html] && !options[:html].is_a?(Hash)
Chris@0:         raise ArgumentError, "Cannot set the :parent to be the same as this item" if options[:parent] == name.to_sym
Chris@0:         raise ArgumentError, "Invalid option :children for menu item '#{name}'" if options[:children] && !options[:children].respond_to?(:call)
Chris@0:         @name = name
Chris@0:         @url = url
Chris@0:         @condition = options[:if]
Chris@0:         @param = options[:param] || :id
Chris@0:         @caption = options[:caption]
Chris@0:         @html_options = options[:html] || {}
Chris@0:         # Adds a unique class to each menu item based on its name
Chris@0:         @html_options[:class] = [@html_options[:class], @name.to_s.dasherize].compact.join(' ')
Chris@0:         @parent = options[:parent]
Chris@0:         @child_menus = options[:children]
Chris@0:         @last = options[:last] || false
Chris@0:         super @name.to_sym
Chris@0:       end
Chris@0:       
Chris@0:       def caption(project=nil)
Chris@0:         if @caption.is_a?(Proc)
Chris@0:           c = @caption.call(project).to_s
Chris@0:           c = @name.to_s.humanize if c.blank?
Chris@0:           c
Chris@0:         else
Chris@0:           if @caption.nil?
Chris@0:             l_or_humanize(name, :prefix => 'label_')
Chris@0:           else
Chris@0:             @caption.is_a?(Symbol) ? l(@caption) : @caption
Chris@0:           end
Chris@0:         end
Chris@0:       end
Chris@0:       
Chris@0:       def html_options(options={})
Chris@0:         if options[:selected]
Chris@0:           o = @html_options.dup
Chris@0:           o[:class] += ' selected'
Chris@0:           o
Chris@0:         else
Chris@0:           @html_options
Chris@0:         end
Chris@0:       end
Chris@0:     end    
Chris@0:   end
Chris@0: end