discourse/app/assets/javascripts/discourse/controllers/list_controller.js

/**
  This controller supports actions when listing topics or categories

  @class ListController
  @extends Discourse.Controller
  @namespace Discourse
  @module Discourse
**/
Discourse.ListController = Discourse.Controller.extend({
  currentUserBinding: 'Discourse.currentUser',
  categoriesBinding: 'Discourse.site.categories',
  categoryBinding: 'topicList.category',
  canCreateCategory: false,
  canCreateTopic: false,
  needs: ['composer', 'modal', 'listTopics'],

  availableNavItems: function() {
    var hasCategories, loggedOn, summary;
    summary = this.get('filterSummary');
    loggedOn = !!Discourse.get('currentUser');
    hasCategories = !!this.get('categories');
    return Discourse.SiteSettings.top_menu.split("|").map(function(i) {
      return Discourse.NavItem.fromText(i, {
        loggedOn: loggedOn,
        hasCategories: hasCategories,
        countSummary: summary
      });
    }).filter(function(i) {
      return i !== null;
    });
  }.property('filterSummary'),

  /**
    Load a list based on a filter

    @method load
    @param {String} filterMode the filter we want to load
    @returns {Ember.Deferred} the promise that will resolve to the list of items.
  **/
  load: function(filterMode) {
    var listController = this;
    this.set('loading', true);

    if (filterMode === 'categories') {
      return Discourse.CategoryList.list(filterMode).then(function(items) {
        listController.set('loading', false);
        listController.set('filterMode', filterMode);
        listController.set('categoryMode', true);
        return items;
      });
    }

    var current = (this.get('availableNavItems').filter(function(f) { return f.name === filterMode; }))[0];
    if (!current) {
      current = Discourse.NavItem.create({ name: filterMode });
    }
    return Discourse.TopicList.list(current).then(function(items) {
      listController.set('filterSummary', items.filter_summary);
      listController.set('filterMode', filterMode);
      listController.set('loading', false);
      return items;
    });
  },

  // Put in the appropriate page title based on our view
  updateTitle: function() {
    if (this.get('filterMode') === 'categories') {
      return Discourse.set('title', Em.String.i18n('categories_list'));
    } else {
      if (this.present('category')) {
        return Discourse.set('title', this.get('category.name').capitalize() + " " + Em.String.i18n('topic.list'));
      } else {
        return Discourse.set('title', Em.String.i18n('topic.list'));
      }
    }
  }.observes('filterMode', 'category'),

  // Create topic button
  createTopic: function() {
    var topicList = this.get('controllers.listTopics.content');
    if (!topicList) return;
    this.get('controllers.composer').open({
      categoryName: this.get('category.name'),
      action: Discourse.Composer.CREATE_TOPIC,
      draftKey: topicList.get('draft_key'),
      draftSequence: topicList.get('draft_sequence')
    });
  },

  createCategory: function() {
    var _ref;
    return (_ref = this.get('controllers.modal')) ? _ref.show(Discourse.EditCategoryView.create()) : void 0;
  }

});

Discourse.ListController.reopenClass({
  filters: ['latest', 'hot', 'favorited', 'read', 'unread', 'new', 'posted']
});