start.php

<?php

define("BOOKMARK_TOOLS_SUBTYPE", "bmfolder");
define("BOOKMARK_TOOLS_RELATIONSHIP", "folder_of");
define("BOOKMARK_TOOLS_BASEURL", elgg_get_site_url() . "bookmark_tools/");

require_once(dirname(__FILE__) . "/lib/functions.php");
require_once(dirname(__FILE__) . "/lib/events.php");
require_once(dirname(__FILE__) . "/lib/hooks.php");
require_once(dirname(__FILE__) . "/lib/page_handlers.php");

function bookmark_tools_init() {
    // extend CSS
    elgg_extend_view("css/elgg", "bookmark_tools/css/site");
    if (bookmark_tools_use_folder_structure()) {
        elgg_extend_view("groups/edit", "bookmark_tools/group_settings");
    }

    // extend js
    elgg_extend_view("js/elgg", "bookmark_tools/js/site");

    // register JS libraries
    $vendors = elgg_get_site_url() . "mod/bookmark_tools/vendors/";

    elgg_register_js("jquery.tree", $vendors . "jstree/jquery.tree.min.js");
    elgg_register_css("jquery.tree", $vendors . "jstree/themes/default/style.css");

    elgg_register_js("jquery.hashchange", $vendors . "hashchange/jquery.hashchange.js");

    // register page handler for nice URL's
    elgg_register_page_handler("bookmark_tools", "bookmark_tools_page_handler");

    // make our own URLs for folders
	elgg_register_plugin_hook_handler('entity:url', 'object', 'bookmark_tools_folder_url');

    // make our own URLs for folder icons
    elgg_register_plugin_hook_handler("entity:icon:url", "object", "bookmark_tools_folder_icon_hook");

    // register group option to allow management of bookmark tree structure
    add_group_tool_option("bookmark_tools_structure_management", elgg_echo("bookmark_tools:group_tool_option:structure_management"));

    // register events
    elgg_register_event_handler("create", "object", "bookmark_tools_object_handler");
    elgg_register_event_handler("update", "object", "bookmark_tools_object_handler");
    elgg_register_event_handler("delete", "object", "bookmark_tools_object_handler_delete");

    // register hooks
    elgg_register_plugin_hook_handler("register", "menu:entity", "bookmark_tools_entity_menu_hook");
    elgg_register_plugin_hook_handler("permissions_check:metadata", "object", "bookmark_tools_can_edit_metadata_hook");
    elgg_register_plugin_hook_handler("route", "bookmarks", "bookmark_tools_bookmark_route_hook");
    elgg_register_plugin_hook_handler("route", "bookmarks_tree", "bookmark_tools_forward_old_link");

    elgg_register_plugin_hook_handler("register", "menu:bookmark_tools_folder_breadcrumb", "bookmark_tools_folder_breadcrumb_hook");
    elgg_register_plugin_hook_handler("register", "menu:bookmark_tools_folder_sidebar_tree", "bookmark_tools_folder_sidebar_tree_hook");

    // register actions
    elgg_register_action("bookmark_tools/groups/save_sort", dirname(__FILE__) . "/actions/groups/save_sort.php");
    elgg_register_action("bookmark_tools/folder/edit", dirname(__FILE__) . "/actions/folder/edit.php");
    elgg_register_action("bookmark_tools/bmfolder/delete", dirname(__FILE__) . "/actions/folder/delete.php");
    elgg_register_action("bookmark_tools/folder/reorder", dirname(__FILE__) . "/actions/folder/reorder.php");
    elgg_register_action("bookmark_tools/bookmarks/hide", dirname(__FILE__) . "/actions/bookmarks/hide.php");

    elgg_register_action("bookmark/move", dirname(__FILE__) . "/actions/bookmarks/move.php");
    elgg_register_action("bookmark/bulk_delete", dirname(__FILE__) . "/actions/bookmarks/bulk_delete.php");

    elgg_register_widget_type("bookmark_folders", elgg_echo("widgets:bookmark_folders:title"), elgg_echo("widgets:bookmark_folders:description"), array(
        "dashboard",
        "profile",
        "groups"
    ));
}

function bookmark_tools_folder_url($hook, $type, $return, $params) {
	$entity = $params['entity'];
	if ($entity->getSubtype() != BOOKMARK_TOOLS_SUBTYPE) {
		return $return;
	}
	
	$container = $entity->getContainerEntity();

    if (elgg_instanceof($container, "group")) {
        $result = "bookmarks/group/" . $container->getGUID() . "/all#" . $entity->getGUID();
    } else {
        $result = "bookmarks/owner/" . $container->username . "#" . $entity->getGUID();
    }

    return $result;
}

// register default Elgg events
elgg_register_event_handler("init", "system", "bookmark_tools_init");