Ghost/ghost/admin/app/controllers/settings/navigation.js

import Ember from 'ember';
import SettingsSaveMixin from 'ghost/mixins/settings-save';

var NavItem = Ember.Object.extend({
    label: '',
    url: '',
    last: false,

    isComplete: Ember.computed('label', 'url', function () {
        return !(Ember.isBlank(this.get('label').trim()) || Ember.isBlank(this.get('url')));
    })
});

export default Ember.Controller.extend(SettingsSaveMixin, {
    config: Ember.inject.service(),
    notifications: Ember.inject.service(),

    blogUrl: Ember.computed('config.blogUrl', function () {
        var url = this.get('config.blogUrl');

        return url.slice(-1) !== '/' ? url + '/' : url;
    }),

    navigationItems: Ember.computed('model.navigation', function () {
        var navItems,
            lastItem;

        try {
            navItems = JSON.parse(this.get('model.navigation') || [{}]);
        } catch (e) {
            navItems = [{}];
        }

        navItems = navItems.map(function (item) {
            return NavItem.create(item);
        });

        lastItem = navItems.get('lastObject');
        if (!lastItem || lastItem.get('isComplete')) {
            navItems.addObject(NavItem.create({last: true}));
        }

        return navItems;
    }),

    updateLastNavItem: Ember.observer('navigationItems.[]', function () {
        var navItems = this.get('navigationItems');

        navItems.forEach(function (item, index, items) {
            if (index === (items.length - 1)) {
                item.set('last', true);
            } else {
                item.set('last', false);
            }
        });
    }),

    save: function () {
        var navSetting,
            blogUrl = this.get('config').blogUrl,
            blogUrlRegex = new RegExp('^' + blogUrl + '(.*)', 'i'),
            navItems = this.get('navigationItems'),
            message = 'One of your navigation items has an empty label. ' +
                '<br /> Please enter a new label or delete the item before saving.',
            match,
            notifications = this.get('notifications');

        // Don't save if there's a blank label.
        if (navItems.find(function (item) {return !item.get('isComplete') && !item.get('last');})) {
            notifications.showAlert(message.htmlSafe(), {type: 'error'});
            return;
        }

        navSetting = navItems.map(function (item) {
            var label,
                url;

            if (!item || !item.get('isComplete')) {
                return;
            }

            label = item.get('label').trim();
            url = item.get('url').trim();

            // is this an internal URL?
            match = url.match(blogUrlRegex);

            if (match) {
                url = match[1];

                // if the last char is not a slash, then add one,
                // as long as there is no # or . in the URL (anchor or file extension)
                // this also handles the empty case for the homepage
                if (url[url.length - 1] !== '/' && url.indexOf('#') === -1 && url.indexOf('.') === -1) {
                    url += '/';
                }
            } else if (!validator.isURL(url) && url !== '' && url[0] !== '/' && url.indexOf('mailto:') !== 0) {
                url = '/' + url;
            }

            return {label: label, url: url};
        }).compact();

        this.set('model.navigation', JSON.stringify(navSetting));

        // trigger change event because even if the final JSON is unchanged
        // we need to have navigationItems recomputed.
        this.get('model').notifyPropertyChange('navigation');

        return this.get('model').save().catch(function (err) {
            notifications.showErrors(err);
        });
    },

    actions: {
        addItem: function () {
            var navItems = this.get('navigationItems'),
                lastItem = navItems.get('lastObject');

            if (lastItem && lastItem.get('isComplete')) {
                navItems.addObject(NavItem.create({last: true})); // Adds new blank navItem
            }
        },

        deleteItem: function (item) {
            if (!item) {
                return;
            }

            var navItems = this.get('navigationItems');

            navItems.removeObject(item);
        },

        moveItem: function (index, newIndex) {
            var navItems = this.get('navigationItems'),
                item = navItems.objectAt(index);

            navItems.removeAt(index);
            navItems.insertAt(newIndex, item);
        },

        updateUrl: function (url, navItem) {
            if (!navItem) {
                return;
            }

            if (Ember.isBlank(url)) {
                navItem.set('url', this.get('blogUrl'));

                return;
            }

            navItem.set('url', url);
        }
    }
});