pulled navigation functions out of elgglib.php

git-svn-id: http://code.elgg.org/elgg/trunk@7136 36083f99-b078-4883-b0ff-0f9b5a30f544

3 files changed, 543 insertions, 535 deletions

diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php
index 2f9acf060..ff7886561 100644
--- a/engine/lib/elgglib.php
+++ b/engine/lib/elgglib.php
@@ -141,326 +141,6 @@ function current_page_url() {
 }
 
 /**
- * Deprecated by elgg_add_submenu_item()
- *
- * @see elgg_add_submenu_item()
- * @deprecated 1.8
- *
- * @param string  $label    The label
- * @param string  $link     The link
- * @param string  $group    The group to store item in
- * @param boolean $onclick  Add a confirmation when clicked?
- * @param boolean $selected Is menu item selected
- *
- * @return bool
- */
-function add_submenu_item($label, $link, $group = 'default', $onclick = false, $selected = NULL) {
-	elgg_deprecated_notice('add_submenu_item was deprecated by elgg_add_submenu_item', 1.8);
-
-	$item = array(
-		'text' => $label,
-		'href' => $link,
-		'selected' => $selected
-	);
-
-	if (!$group) {
-		$group = 'default';
-	}
-
-	if ($onclick) {
-		$js = "onclick=\"javascript:return confirm('" . elgg_echo('deleteconfirm') . "')\"";
-		$item['vars'] = array('js' => $js);
-	}
-	// submenu items were added in the page setup hook usually by checking
-	// the context.  We'll pass in the current context here, which will
-	// emulate that effect.
-	// if context == 'main' (default) it probably means they always wanted
-	// the menu item to show up everywhere.
-	$context = get_context();
-
-	if ($context == 'main') {
-		$context = 'all';
-	}
-	return elgg_add_submenu_item($item, $context, $group);
-}
-
-/**
- * Add an entry to the submenu.
- *
- * @param array  $item    The item as:
- * <code>
- * array(
- * 	'title' => 'Text to display',
- * 	'url' => 'URL of the link',
- * 	'id' => 'entry_unique_id' //used by children items to identify parents
- * 	'parent_id' => 'id_of_parent',
- * 	'selected' => BOOL // Is this item selected? (If NULL or unset will attempt to guess)
- * 	'vars' => array() // Array of vars to pass to the navigation/submenu_item view
- * )
- * </code>
- *
- * @param string $context Context in which to display this menu item.  'all'
- *                        will make it show up all the time. Use sparingly.
- * @param string $group   Group for the item. Each submenu group has its own <ul>
- *
- * @return BOOL
- * @since 1.8
- * @see elgg_prepare_submenu
- */
-function elgg_add_submenu_item(array $item, $context = 'all', $group = 'default') {
-	global $CONFIG;
-
-	if (!isset($CONFIG->submenu_items)) {
-		$CONFIG->submenu_items = array();
-	}
-
-	if (!isset($CONFIG->submenu_items[$context])) {
-		$CONFIG->submenu_items[$context] = array();
-	}
-
-	if (!isset($CONFIG->submenu_items[$context][$group])) {
-		$CONFIG->submenu_items[$context][$group] = array();
-	}
-
-	if (!isset($item['text'])) {
-		return FALSE;
-	}
-
-	// we use persistent object properties in the submenu
-	// setup function, so normalize the array to an object.
-	// we pass it in as an array because this would be the only
-	// place in elgg that we ask for an object like this.
-	// consistency ftw.
-	$item_obj = new StdClass();
-
-	foreach ($item as $k => $v) {
-		switch ($k) {
-			case 'parent_id':
-			case 'id':
-				// make sure '' and false make sense
-				$v = (empty($v)) ? NULL : $v;
-
-			default:
-				$item_obj->$k = $v;
-				break;
-		}
-	}
-
-	$CONFIG->submenu_items[$context][$group][] = $item_obj;
-
-	return TRUE;
-}
-
-/**
- * Properly nest all submenu entries for contexts $context and 'all'
- *
- * @param string $context Context for menus
- * @param bool   $sort    Sort the menu items alphabetically
- *
- * @since 1.8
- * @see elgg_add_submenu_item
- *
- * @return true
- */
-function elgg_prepare_submenu($context = 'main', $sort = FALSE) {
-	global $CONFIG;
-
-	if (!isset($CONFIG->submenu_items) || !($CONFIG->submenu_items)) {
-		return FALSE;
-	}
-
-	$groups = array();
-
-	if (isset($CONFIG->submenu_items['all'])) {
-		$groups = $CONFIG->submenu_items['all'];
-	}
-
-	if (isset($CONFIG->submenu_items[$context])) {
-		$groups = array_merge_recursive($groups, $CONFIG->submenu_items[$context]);
-	}
-
-	if (!$groups) {
-		return FALSE;
-	}
-
-	foreach ($groups as $group => $items) {
-		if ($sort) {
-			usort($items, 'elgg_submenu_item_cmp');
-		}
-
-		$parsed_menu = array();
-		// determin which children need to go in this item.
-		foreach ($items as $i => $item) {
-			// can only support children if there's an id
-			if (isset($item->id)) {
-				foreach ($items as $child_i => $child_item) {
-					// don't check ourselves or used children.
-					if ($child_i == $i || $child_item->used == TRUE) {
-						continue;
-					}
-
-					if (isset($child_item->parent_id) && $child_item->parent_id == $item->id) {
-						if (!isset($item->children)) {
-							$item->children = array();
-						}
-						$item->children[] = $child_item;
-						$child_item->parent = $item;
-						// don't unset because we still need to check this item for children
-						$child_item->used = TRUE;
-					}
-				}
-
-				// if the parent doesn't have a url, make it the first child item.
-				if (isset($item->children) && $item->children && !$item->href) {
-					$child = $item->children[0];
-					while ($child && !isset($child->href)) {
-						if (isset($child->children) && isset($child->children[0])) {
-							$child = $child->children[0];
-						} else {
-							$child = NULL;
-						}
-					}
-
-					if ($child && isset($child->href)) {
-						$item->href = $child->href;
-					} else {
-						// @todo There are no URLs anywhere in this tree.
-						$item->href = $CONFIG->url;
-					}
-				}
-			}
-
-			// only add top-level elements to the menu.
-			// the rest are children.
-			if (!isset($item->parent_id)) {
-				$parsed_menu[] = $item;
-			}
-		}
-
-		$CONFIG->submenu[$context][$group] = $parsed_menu;
-	}
-
-	return TRUE;
-}
-
-/**
- * Helper function used to sort submenu items by their display text.
- *
- * @param object $a First object
- * @param object $b Second object
- *
- * @return int
- * @since 1.8
- * @see elgg_prepare_submenu
- */
-function elgg_submenu_item_cmp($a, $b) {
-	$a = $a->text;
-	$b = $b->text;
-
-	return strnatcmp($a, $b);
-}
-
-/**
- * Use elgg_get_submenu().
- *
- * @see elgg_get_submenu()
- * @deprecated 1.8
- *
- * @return string
- */
-function get_submenu() {
-	elgg_deprecated_notice("get_submenu() has been deprecated by elgg_get_submenu()", 1.8);
-	return elgg_get_submenu();
-}
-
-/**
- * Return the HTML for a sidemenu.
- *
- * @param string $context The context of the submenu (defaults to main)
- * @param BOOL   $sort    Sort by display name?
- *
- * @return string Formatted HTML.
- * @since 1.8
- * @todo Rename to a view function. See {@trac #2320}.
- */
-function elgg_get_submenu($context = NULL, $sort = FALSE) {
-	global $CONFIG;
-
-	if (!$context) {
-		$context = get_context();
-	}
-
-	if (!elgg_prepare_submenu($context, $sort)) {
-		return '';
-	}
-
-	$groups = $CONFIG->submenu[$context];
-	$submenu_html = '';
-
-	foreach ($groups as $group => $items) {
-		// how far down we are in children arrays
-		$depth = 0;
-		// push and pop parent items
-		$temp_items = array();
-
-		while ($item = current($items)) {
-			// ignore parents created by a child but parent never defined properly
-			if (!isset($item->text) || !($item->text)) {
-				next($items);
-				continue;
-			}
-
-			// try to guess if this should be selected if they don't specify
-			if ((!isset($item->selected) || $item->selected === NULL) && isset($item->href)) {
-				$item->selected = elgg_http_url_is_identical(full_url(), $item->href);
-			}
-
-			// traverse up the parent tree if matached to mark all parents as selected/expanded.
-			if ($item->selected && isset($item->parent)) {
-				$parent = $item->parent;
-				while ($parent) {
-					$parent->selected = TRUE;
-					if (isset($parent->parent)) {
-						$parent = $parent->parent;
-					} else {
-						$parent = NULL;
-					}
-				}
-			}
-
-			// get the next item
-			if (isset($item->children) && $item->children) {
-				$depth++;
-				array_push($temp_items, $items);
-				$items = $item->children;
-			} elseif ($depth > 0) {
-				// check if there are more children elements in the current items
-				// pop back up to the parent(s) if not
-				if ($item = next($items)) {
-					continue;
-				} else {
-					while ($depth > 0) {
-						$depth--;
-						$items = array_pop($temp_items);
-						if ($item = next($items)) {
-							break;
-						}
-					}
-				}
-			} else {
-				next($items);
-			}
-		}
-
-		$vars = array('group' => $group, 'items' => $items);
-		$submenu_html .= elgg_view('navigation/submenu_group', $vars);
-	}
-
-	// include the JS for the expand menus too
-	return elgg_view('navigation/submenu_js') . $submenu_html;
-}
-
-/**
  * Returns the HTML for "likes" and "like this" on entities.
  *
  * @param ElggEntity $entity The entity to like
@@ -713,64 +393,6 @@ function get_register($register_name) {
 }
 
 /**
- * Adds an item to the site-wide menu.
- *
- * You can obtain the menu array by calling {@link get_register('menu')}
- *
- * @param string $menu_name     The name of the menu item
- * @param string $menu_url      The URL of the page
- * @param array  $menu_children Optionally, an array of submenu items (not currently used)
- * @param string $context       The context of the menu
- *
- * @return true|false Depending on success
- * @todo Can be deprecated when the new menu system is introduced.
- */
-function add_menu($menu_name, $menu_url, $menu_children = array(), $context = "") {
-	global $CONFIG;
-
-	if (!isset($CONFIG->menucontexts)) {
-		$CONFIG->menucontexts = array();
-	}
-
-	if (empty($context)) {
-		$context = get_plugin_name();
-	}
-
-	$value = new stdClass();
-	$value->url = $menu_url;
-	$value->context = $context;
-
-	$CONFIG->menucontexts[] = $context;
-	return add_to_register('menu', $menu_name, $value, $menu_children);
-}
-
-/**
- * Removes an item from the menu register
- *
- * @param string $menu_name The name of the menu item
- *
- * @return true|false Depending on success
- */
-function remove_menu($menu_name) {
-	return remove_from_register('menu', $menu_name);
-}
-
-/**
- * Returns a menu item for use in the children section of add_menu()
- * This is not currently used in the Elgg core.
- *
- * @param string $menu_name The name of the menu item
- * @param string $menu_url  Its URL
- *
- * @return stdClass|false Depending on success
- * @todo Can be deprecated when the new menu system is introduced.
- */
-function menu_item($menu_name, $menu_url) {
-	elgg_deprecated_notice('menu_item() is deprecated by add_submenu_item', 1.7);
-	return make_register_object($menu_name, $menu_url);
-}
-
-/**
  * Queues a message to be displayed.
  *
  * Messages will not be displayed immediately, but are stored in
@@ -1697,6 +1319,36 @@ function ini_get_bool($ini_get_arg) {
 }
 
 /**
+ * Returns a PHP INI setting in bytes.
+ *
+ * @tip Use this for arithmetic when determining if a file can be uploaded.
+ *
+ * @param str $setting The php.ini setting
+ *
+ * @return int
+ * @since 1.7.0
+ * @link http://www.php.net/manual/en/function.ini-get.php
+ */
+function elgg_get_ini_setting_in_bytes($setting) {
+	// retrieve INI setting
+	$val = ini_get($setting);
+
+	// convert INI setting when shorthand notation is used
+	$last = strtolower($val[strlen($val) - 1]);
+	switch($last) {
+		case 'g':
+			$val *= 1024;
+		case 'm':
+			$val *= 1024;
+		case 'k':
+			$val *= 1024;
+	}
+
+	// return byte value
+	return $val;
+}
+
+/**
  * Returns true is string is not empty, false, or null.
  *
  * Function to be used in array_filter which returns true if $string is not null.
@@ -1937,54 +1589,6 @@ function elgg_http_add_url_query_elements($url, array $elements) {
 }
 
 /**
- * Adds a breadcrumb to the breadcrumbs stack.
- *
- * @param string $title The title to display
- * @param string $link  Optional. The link for the title.
- *
- * @return void
- *
- * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
- */
-function elgg_push_breadcrumb($title, $link = NULL) {
-	global $CONFIG;
-	if (!is_array($CONFIG->breadcrumbs)) {
-		$CONFIG->breadcrumbs = array();
-	}
-
-	// avoid key collisions.
-	$CONFIG->breadcrumbs[] = array('title' => $title, 'link' => $link);
-}
-
-/**
- * Removes last breadcrumb entry.
- *
- * @return array popped item.
- * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
- */
-function elgg_pop_breadcrumb() {
-	global $CONFIG;
-
-	if (is_array($CONFIG->breadcrumbs)) {
-		array_pop($CONFIG->breadcrumbs);
-	}
-
-	return FALSE;
-}
-
-/**
- * Returns all breadcrumbs as an array of array('title' => 'Readable Title', 'link' => 'URL')
- *
- * @return array Breadcrumbs
- * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
- */
-function elgg_get_breadcrumbs() {
-	global $CONFIG;
-
-	return (is_array($CONFIG->breadcrumbs)) ? $CONFIG->breadcrumbs : array();
-}
-
-/**
  * Load all the REQUEST variables into the sticky form cache
  *
  * Call this from an action when you want all your submitted variables
@@ -2111,36 +1715,6 @@ function elgg_set_active_sticky_form($form_name) {
 }
 
 /**
- * Returns a PHP INI setting in bytes.
- *
- * @tip Use this for arithmetic when determining if a file can be uploaded.
- *
- * @param str $setting The php.ini setting
- *
- * @return int
- * @since 1.7.0
- * @link http://www.php.net/manual/en/function.ini-get.php
- */
-function elgg_get_ini_setting_in_bytes($setting) {
-	// retrieve INI setting
-	$val = ini_get($setting);
-
-	// convert INI setting when shorthand notation is used
-	$last = strtolower($val[strlen($val) - 1]);
-	switch($last) {
-		case 'g':
-			$val *= 1024;
-		case 'm':
-			$val *= 1024;
-		case 'k':
-			$val *= 1024;
-	}
-
-	// return byte value
-	return $val;
-}
-
-/**
  * Serve javascript pages.
  *
  * Searches for views under js/ and outputs them with special
@@ -2258,74 +1832,6 @@ function elgg_api_test($hook, $type, $value, $params) {
 }
 
 /**
- * Returns the main site menu.
- *
- * @note The main site menu is split into "featured" links and
- * "more" links.
- *
- * @return array ('featured_urls' and 'more')
- * @since 1.8
- * @link http://docs.elgg.org/Tutorials/UI/SiteMenu
- */
-function elgg_get_nav_items() {
-	$menu_items = get_register('menu');
-	$featured_urls_info = get_config('menu_items_featured_urls');
-
-	$more = array();
-	$featured_urls = array();
-	$featured_urls_sanitised = array();
-
-	// easier to compare with in_array() than embedded foreach()es
-	$valid_urls = array();
-	foreach ($menu_items as $info) {
-		$valid_urls[] = $info->value->url;
-	}
-
-	// make sure the url is a valid link.
-	// this prevents disabled plugins leaving behind
-	// valid links when not using a pagehandler.
-	if ($featured_urls_info) {
-		foreach ($featured_urls_info as $info) {
-			if (in_array($info->value->url, $valid_urls)) {
-				$featured_urls[] = $info->value->url;
-				$featured_urls_sanitised[] = $info;
-			}
-		}
-	}
-
-	// add toolbar entries if not hiding dupes.
-	foreach ($menu_items as $name => $info) {
-		if (!in_array($info->value->url, $featured_urls)) {
-			$more[] = $info;
-		}
-	}
-
-	return array(
-		'featured' => $featured_urls_sanitised,
-		'more' => $more
-	);
-}
-
-/**
- * Registers any custom menu items with the main Site Menu.
- *
- * @note Custom menu items are added through the admin interface.  Plugins
- * can add standard menu items by using {@link add_menu()}.
- *
- * @since 1.8
- * @link http://docs.elgg.org/Tutorials/UI/SiteMenu
- * @elgg_event_handler init system
- * @return void
- */
-function add_custom_menu_items() {
-	if ($custom_items = get_config('menu_items_custom_items')) {
-		foreach ($custom_items as $url => $name) {
-			add_menu($name, $url);
-		}
-	}
-}
-
-/**
  * Test if two URLs are functionally identical.
  *
  * @tip If $ignore_params is used, neither the name nor its value will be considered when comparing.
diff --git a/engine/lib/navigation.php b/engine/lib/navigation.php
new file mode 100644
index 000000000..a5b087bd8
--- /dev/null
+++ b/engine/lib/navigation.php
@@ -0,0 +1,502 @@
+<?php
+/**
+ * Elgg navigation library
+ * Functions for managing menus and other navigational elements
+ *
+ * @package Elgg.Core
+ * @subpackage Navigation
+ */
+
+/**
+ * Deprecated by elgg_add_submenu_item()
+ *
+ * @see elgg_add_submenu_item()
+ * @deprecated 1.8
+ *
+ * @param string  $label    The label
+ * @param string  $link     The link
+ * @param string  $group    The group to store item in
+ * @param boolean $onclick  Add a confirmation when clicked?
+ * @param boolean $selected Is menu item selected
+ *
+ * @return bool
+ */
+function add_submenu_item($label, $link, $group = 'default', $onclick = false, $selected = NULL) {
+	elgg_deprecated_notice('add_submenu_item was deprecated by elgg_add_submenu_item', 1.8);
+
+	$item = array(
+		'text' => $label,
+		'href' => $link,
+		'selected' => $selected
+	);
+
+	if (!$group) {
+		$group = 'default';
+	}
+
+	if ($onclick) {
+		$js = "onclick=\"javascript:return confirm('" . elgg_echo('deleteconfirm') . "')\"";
+		$item['vars'] = array('js' => $js);
+	}
+	// submenu items were added in the page setup hook usually by checking
+	// the context.  We'll pass in the current context here, which will
+	// emulate that effect.
+	// if context == 'main' (default) it probably means they always wanted
+	// the menu item to show up everywhere.
+	$context = get_context();
+
+	if ($context == 'main') {
+		$context = 'all';
+	}
+	return elgg_add_submenu_item($item, $context, $group);
+}
+
+/**
+ * Add an entry to the submenu.
+ *
+ * @param array  $item    The item as:
+ * <code>
+ * array(
+ * 	'title' => 'Text to display',
+ * 	'url' => 'URL of the link',
+ * 	'id' => 'entry_unique_id' //used by children items to identify parents
+ * 	'parent_id' => 'id_of_parent',
+ * 	'selected' => BOOL // Is this item selected? (If NULL or unset will attempt to guess)
+ * 	'vars' => array() // Array of vars to pass to the navigation/submenu_item view
+ * )
+ * </code>
+ *
+ * @param string $context Context in which to display this menu item.  'all'
+ *                        will make it show up all the time. Use sparingly.
+ * @param string $group   Group for the item. Each submenu group has its own <ul>
+ *
+ * @return BOOL
+ * @since 1.8
+ * @see elgg_prepare_submenu
+ */
+function elgg_add_submenu_item(array $item, $context = 'all', $group = 'default') {
+	global $CONFIG;
+
+	if (!isset($CONFIG->submenu_items)) {
+		$CONFIG->submenu_items = array();
+	}
+
+	if (!isset($CONFIG->submenu_items[$context])) {
+		$CONFIG->submenu_items[$context] = array();
+	}
+
+	if (!isset($CONFIG->submenu_items[$context][$group])) {
+		$CONFIG->submenu_items[$context][$group] = array();
+	}
+
+	if (!isset($item['text'])) {
+		return FALSE;
+	}
+
+	// we use persistent object properties in the submenu
+	// setup function, so normalize the array to an object.
+	// we pass it in as an array because this would be the only
+	// place in elgg that we ask for an object like this.
+	// consistency ftw.
+	$item_obj = new StdClass();
+
+	foreach ($item as $k => $v) {
+		switch ($k) {
+			case 'parent_id':
+			case 'id':
+				// make sure '' and false make sense
+				$v = (empty($v)) ? NULL : $v;
+
+			default:
+				$item_obj->$k = $v;
+				break;
+		}
+	}
+
+	$CONFIG->submenu_items[$context][$group][] = $item_obj;
+
+	return TRUE;
+}
+
+/**
+ * Properly nest all submenu entries for contexts $context and 'all'
+ *
+ * @param string $context Context for menus
+ * @param bool   $sort    Sort the menu items alphabetically
+ *
+ * @since 1.8
+ * @see elgg_add_submenu_item
+ *
+ * @return true
+ */
+function elgg_prepare_submenu($context = 'main', $sort = FALSE) {
+	global $CONFIG;
+
+	if (!isset($CONFIG->submenu_items) || !($CONFIG->submenu_items)) {
+		return FALSE;
+	}
+
+	$groups = array();
+
+	if (isset($CONFIG->submenu_items['all'])) {
+		$groups = $CONFIG->submenu_items['all'];
+	}
+
+	if (isset($CONFIG->submenu_items[$context])) {
+		$groups = array_merge_recursive($groups, $CONFIG->submenu_items[$context]);
+	}
+
+	if (!$groups) {
+		return FALSE;
+	}
+
+	foreach ($groups as $group => $items) {
+		if ($sort) {
+			usort($items, 'elgg_submenu_item_cmp');
+		}
+
+		$parsed_menu = array();
+		// determin which children need to go in this item.
+		foreach ($items as $i => $item) {
+			// can only support children if there's an id
+			if (isset($item->id)) {
+				foreach ($items as $child_i => $child_item) {
+					// don't check ourselves or used children.
+					if ($child_i == $i || $child_item->used == TRUE) {
+						continue;
+					}
+
+					if (isset($child_item->parent_id) && $child_item->parent_id == $item->id) {
+						if (!isset($item->children)) {
+							$item->children = array();
+						}
+						$item->children[] = $child_item;
+						$child_item->parent = $item;
+						// don't unset because we still need to check this item for children
+						$child_item->used = TRUE;
+					}
+				}
+
+				// if the parent doesn't have a url, make it the first child item.
+				if (isset($item->children) && $item->children && !$item->href) {
+					$child = $item->children[0];
+					while ($child && !isset($child->href)) {
+						if (isset($child->children) && isset($child->children[0])) {
+							$child = $child->children[0];
+						} else {
+							$child = NULL;
+						}
+					}
+
+					if ($child && isset($child->href)) {
+						$item->href = $child->href;
+					} else {
+						// @todo There are no URLs anywhere in this tree.
+						$item->href = $CONFIG->url;
+					}
+				}
+			}
+
+			// only add top-level elements to the menu.
+			// the rest are children.
+			if (!isset($item->parent_id)) {
+				$parsed_menu[] = $item;
+			}
+		}
+
+		$CONFIG->submenu[$context][$group] = $parsed_menu;
+	}
+
+	return TRUE;
+}
+
+/**
+ * Helper function used to sort submenu items by their display text.
+ *
+ * @param object $a First object
+ * @param object $b Second object
+ *
+ * @return int
+ * @since 1.8
+ * @see elgg_prepare_submenu
+ */
+function elgg_submenu_item_cmp($a, $b) {
+	$a = $a->text;
+	$b = $b->text;
+
+	return strnatcmp($a, $b);
+}
+
+/**
+ * Use elgg_get_submenu().
+ *
+ * @see elgg_get_submenu()
+ * @deprecated 1.8
+ *
+ * @return string
+ */
+function get_submenu() {
+	elgg_deprecated_notice("get_submenu() has been deprecated by elgg_get_submenu()", 1.8);
+	return elgg_get_submenu();
+}
+
+/**
+ * Return the HTML for a sidemenu.
+ *
+ * @param string $context The context of the submenu (defaults to main)
+ * @param BOOL   $sort    Sort by display name?
+ *
+ * @return string Formatted HTML.
+ * @since 1.8
+ * @todo Rename to a view function. See {@trac #2320}.
+ */
+function elgg_get_submenu($context = NULL, $sort = FALSE) {
+	global $CONFIG;
+
+	if (!$context) {
+		$context = get_context();
+	}
+
+	if (!elgg_prepare_submenu($context, $sort)) {
+		return '';
+	}
+
+	$groups = $CONFIG->submenu[$context];
+	$submenu_html = '';
+
+	foreach ($groups as $group => $items) {
+		// how far down we are in children arrays
+		$depth = 0;
+		// push and pop parent items
+		$temp_items = array();
+
+		while ($item = current($items)) {
+			// ignore parents created by a child but parent never defined properly
+			if (!isset($item->text) || !($item->text)) {
+				next($items);
+				continue;
+			}
+
+			// try to guess if this should be selected if they don't specify
+			if ((!isset($item->selected) || $item->selected === NULL) && isset($item->href)) {
+				$item->selected = elgg_http_url_is_identical(full_url(), $item->href);
+			}
+
+			// traverse up the parent tree if matached to mark all parents as selected/expanded.
+			if ($item->selected && isset($item->parent)) {
+				$parent = $item->parent;
+				while ($parent) {
+					$parent->selected = TRUE;
+					if (isset($parent->parent)) {
+						$parent = $parent->parent;
+					} else {
+						$parent = NULL;
+					}
+				}
+			}
+
+			// get the next item
+			if (isset($item->children) && $item->children) {
+				$depth++;
+				array_push($temp_items, $items);
+				$items = $item->children;
+			} elseif ($depth > 0) {
+				// check if there are more children elements in the current items
+				// pop back up to the parent(s) if not
+				if ($item = next($items)) {
+					continue;
+				} else {
+					while ($depth > 0) {
+						$depth--;
+						$items = array_pop($temp_items);
+						if ($item = next($items)) {
+							break;
+						}
+					}
+				}
+			} else {
+				next($items);
+			}
+		}
+
+		$vars = array('group' => $group, 'items' => $items);
+		$submenu_html .= elgg_view('navigation/submenu_group', $vars);
+	}
+
+	// include the JS for the expand menus too
+	return elgg_view('navigation/submenu_js') . $submenu_html;
+}
+
+/**
+ * Registers any custom menu items with the main Site Menu.
+ *
+ * @note Custom menu items are added through the admin interface.  Plugins
+ * can add standard menu items by using {@link add_menu()}.
+ *
+ * @since 1.8
+ * @link http://docs.elgg.org/Tutorials/UI/SiteMenu
+ * @elgg_event_handler init system
+ * @return void
+ */
+function add_custom_menu_items() {
+	if ($custom_items = get_config('menu_items_custom_items')) {
+		foreach ($custom_items as $url => $name) {
+			add_menu($name, $url);
+		}
+	}
+}
+
+/**
+ * Returns the main site menu.
+ *
+ * @note The main site menu is split into "featured" links and
+ * "more" links.
+ *
+ * @return array ('featured_urls' and 'more')
+ * @since 1.8
+ * @link http://docs.elgg.org/Tutorials/UI/SiteMenu
+ */
+function elgg_get_nav_items() {
+	$menu_items = get_register('menu');
+	$featured_urls_info = get_config('menu_items_featured_urls');
+
+	$more = array();
+	$featured_urls = array();
+	$featured_urls_sanitised = array();
+
+	// easier to compare with in_array() than embedded foreach()es
+	$valid_urls = array();
+	foreach ($menu_items as $info) {
+		$valid_urls[] = $info->value->url;
+	}
+
+	// make sure the url is a valid link.
+	// this prevents disabled plugins leaving behind
+	// valid links when not using a pagehandler.
+	if ($featured_urls_info) {
+		foreach ($featured_urls_info as $info) {
+			if (in_array($info->value->url, $valid_urls)) {
+				$featured_urls[] = $info->value->url;
+				$featured_urls_sanitised[] = $info;
+			}
+		}
+	}
+
+	// add toolbar entries if not hiding dupes.
+	foreach ($menu_items as $name => $info) {
+		if (!in_array($info->value->url, $featured_urls)) {
+			$more[] = $info;
+		}
+	}
+
+	return array(
+		'featured' => $featured_urls_sanitised,
+		'more' => $more
+	);
+}
+
+/**
+ * Adds an item to the site-wide menu.
+ *
+ * You can obtain the menu array by calling {@link get_register('menu')}
+ *
+ * @param string $menu_name     The name of the menu item
+ * @param string $menu_url      The URL of the page
+ * @param array  $menu_children Optionally, an array of submenu items (not currently used)
+ * @param string $context       The context of the menu
+ *
+ * @return true|false Depending on success
+ * @todo Can be deprecated when the new menu system is introduced.
+ */
+function add_menu($menu_name, $menu_url, $menu_children = array(), $context = "") {
+	global $CONFIG;
+
+	if (!isset($CONFIG->menucontexts)) {
+		$CONFIG->menucontexts = array();
+	}
+
+	if (empty($context)) {
+		$context = get_plugin_name();
+	}
+
+	$value = new stdClass();
+	$value->url = $menu_url;
+	$value->context = $context;
+
+	$CONFIG->menucontexts[] = $context;
+	return add_to_register('menu', $menu_name, $value, $menu_children);
+}
+
+/**
+ * Removes an item from the menu register
+ *
+ * @param string $menu_name The name of the menu item
+ *
+ * @return true|false Depending on success
+ */
+function remove_menu($menu_name) {
+	return remove_from_register('menu', $menu_name);
+}
+
+/**
+ * Returns a menu item for use in the children section of add_menu()
+ * This is not currently used in the Elgg core.
+ *
+ * @param string $menu_name The name of the menu item
+ * @param string $menu_url  Its URL
+ *
+ * @return stdClass|false Depending on success
+ * @todo Can be deprecated when the new menu system is introduced.
+ */
+function menu_item($menu_name, $menu_url) {
+	elgg_deprecated_notice('menu_item() is deprecated by add_submenu_item', 1.7);
+	return make_register_object($menu_name, $menu_url);
+}
+
+/**
+ * Adds a breadcrumb to the breadcrumbs stack.
+ *
+ * @param string $title The title to display
+ * @param string $link  Optional. The link for the title.
+ *
+ * @return void
+ *
+ * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
+ */
+function elgg_push_breadcrumb($title, $link = NULL) {
+	global $CONFIG;
+	if (!is_array($CONFIG->breadcrumbs)) {
+		$CONFIG->breadcrumbs = array();
+	}
+
+	// avoid key collisions.
+	$CONFIG->breadcrumbs[] = array('title' => $title, 'link' => $link);
+}
+
+/**
+ * Removes last breadcrumb entry.
+ *
+ * @return array popped item.
+ * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
+ */
+function elgg_pop_breadcrumb() {
+	global $CONFIG;
+
+	if (is_array($CONFIG->breadcrumbs)) {
+		array_pop($CONFIG->breadcrumbs);
+	}
+
+	return FALSE;
+}
+
+/**
+ * Returns all breadcrumbs as an array of array('title' => 'Readable Title', 'link' => 'URL')
+ *
+ * @return array Breadcrumbs
+ * @link http://docs.elgg.org/Tutorials/UI/Breadcrumbs
+ */
+function elgg_get_breadcrumbs() {
+	global $CONFIG;
+
+	return (is_array($CONFIG->breadcrumbs)) ? $CONFIG->breadcrumbs : array();
+}
diff --git a/engine/start.php b/engine/start.php
index 5d08c77d5..28f6aa56a 100644
--- a/engine/start.php
+++ b/engine/start.php
@@ -60,7 +60,8 @@ $lib_dir = dirname(__FILE__) . '/lib/';
  */
 $required_files = array(
 	'elgglib.php', 'views.php', 'access.php', 'system_log.php', 'export.php',
-	'sessions.php', 'languages.php', 'input.php', 'install.php', 'cache.php', 'output.php'
+	'sessions.php', 'languages.php', 'input.php', 'install.php', 'cache.php',
+	'output.php'
 );
 
 // include bootstraping libs
@@ -91,16 +92,15 @@ $lib_files = array(
 	// these need to be loaded first.
 	'database.php', 'actions.php',
 
-	'admin.php', 'annotations.php', 'api.php', 'cache.php',
-	'calendar.php', 'configuration.php', 'cron.php', 'entities.php',
-	'export.php', 'extender.php', 'filestore.php', 'group.php',
-	'input.php', 'location.php', 'mb_wrapper.php',
-	'memcache.php', 'metadata.php', 'metastrings.php', 'notification.php',
-	'objects.php', 'opendd.php', 'pagehandler.php',
-	'pageowner.php', 'pam.php', 'plugins.php',
-	'relationships.php', 'river.php', 'sites.php',
-	'statistics.php', 'system_log.php', 'tags.php', 'usersettings.php',
-	'users.php', 'version.php', 'widgets.php', 'xml.php', 'xml-rpc.php'
+	'admin.php', 'annotations.php', 'api.php', 'calendar.php',
+	'configuration.php', 'cron.php', 'entities.php', 'export.php',
+	'extender.php', 'filestore.php', 'group.php', 
+	'location.php', 'mb_wrapper.php', 'memcache.php', 'metadata.php',
+	'metastrings.php', 'navigation.php', 'notification.php', 'objects.php',
+	'opendd.php', 'pagehandler.php', 'pageowner.php', 'pam.php', 'plugins.php',
+	'relationships.php', 'river.php', 'sites.php', 'statistics.php', 'tags.php',
+	'usersettings.php', 'users.php', 'version.php', 'widgets.php', 'xml.php',
+	'xml-rpc.php'
 );
 
 foreach ($lib_files as $file) {