felixarntz/global-admin

<?php
/**
 * Hack functions.
 *
 * Global Admin integrates deeply into WordPress Core.
 * Unfortunately we need to hacks to make it happen in a plugin.
 *
 * @package WPGlobalAdmin
 * @since 1.0.0
 */

/**
 * Adjusts the ID and base of the current screen if in the global admin.
 *
 * This is very hacky, but the class is final and just not extendable at all.
 *
 * @since 1.0.0
 * @access private
 *
 * @param WP_Screen $wp_screen Current screen.
 */
function _ga_adjust_global_admin_screen( $wp_screen ) {
    if ( defined( 'WP_GLOBAL_ADMIN' ) && WP_GLOBAL_ADMIN ) {
        $wp_screen->id   .= '-global';
        $wp_screen->base .= '-global';
    }
}
add_action( 'current_screen', '_ga_adjust_global_admin_screen' );

/**
 * Adjusts the $self global to be set correctly in the global admin.
 *
 * The 'parent_file' filter is simply used because it fires in the right location.
 * The filter value is passed through without being modified.
 *
 * @since 1.0.0
 * @access private
 *
 * @global string $self Current admin file.
 *
 * @param string $parent_file Parent file.
 * @return string Unmodified parent file.
 */
function _ga_adjust_global_admin_self( $parent_file ) {
    global $self;

    if ( defined( 'WP_GLOBAL_ADMIN' ) && WP_GLOBAL_ADMIN ) {
        $self = preg_replace( '|^.*/wp-admin/global/|i', '', $_SERVER['PHP_SELF'] );
    }

    return $parent_file;
}
add_filter( 'parent_file', '_ga_adjust_global_admin_self' );

/**
 * This is an incredibly hacky attempt to work with menus in the global admin.
 * Looks like there's no other way to do it from a plugin.
 *
 * @since 1.0.0
 * @access private
 */
function _ga_create_global_admin_menu() {
    global $menu, $submenu, $_wp_real_parent_file, $pagenow;

    if ( ! is_global_admin() ) {
        return;
    }

    if ( isset( $_wp_real_parent_file ) ) {
        unset( $_wp_real_parent_file );
    }

    $menu    = array();
    $submenu = array();

    remove_all_actions( '_admin_menu' );

    if ( 'global.php' === $pagenow ) {
        preg_match( '#/wp-admin/global/?(.*?)$#i', $_SERVER['PHP_SELF'], $self_matches );

        $pagenow = $self_matches[1];
        $pagenow = trim( $pagenow, '/' );
        $pagenow = preg_replace( '#\?.*?$#', '', $pagenow );
        if ( '' === $pagenow || 'index' === $pagenow || 'index.php' === $pagenow ) {
            $pagenow = 'index.php';
        } else {
            preg_match( '#(.*?)(/|$)#', $pagenow, $self_matches );

            $pagenow = strtolower( $self_matches[1] );
            if ( '.php' !== substr( $pagenow, -4, 4 ) ) {
                $pagenow .= '.php';
            }
        }
    }

    require_once( GA_PATH . 'wp-global-admin/wp-admin/global/menu.php' );

    /**
     * Fires before the administration menu loads in the global admin.
     *
     * The hook fires before menus and sub-menus are removed based on user privileges.
     *
     * @private
     * @since 1.0.0
     */
    do_action( '_global_admin_menu' );
}
add_action( '_admin_menu', '_ga_create_global_admin_menu', 0 );

/**
 * This is another incredibly hacky attempt to work with menus in the global admin.
 * Looks like there's no other way to do it from a plugin.
 *
 * @since 1.0.0
 * @access private
 */
function _ga_trigger_global_admin_menu_hook() {
    if ( ! is_global_admin() ) {
        return;
    }

    remove_all_actions( 'admin_menu' );

    /**
     * Fires before the administration menu loads in the global admin.
     *
     * @since 1.0.0
     *
     * @param string $context Empty context.
     */
    do_action( 'global_admin_menu', '' );
}
add_action( 'admin_menu', '_ga_trigger_global_admin_menu_hook', 0 );

/**
 * This enables triggering a 'global_admin_notices' hook. Of course in a hacky way.
 *
 * @since 1.0.0
 * @access private
 */
function _ga_trigger_global_admin_notices_hook() {
    if ( ! is_global_admin() ) {
        return;
    }

    remove_all_actions( 'admin_notices' );

    /**
     * Prints global admin screen notices.
     *
     * @since 1.0.0
     */
    do_action( 'global_admin_notices' );
}
add_action( 'admin_notices', '_ga_trigger_global_admin_notices_hook', 0 );

/**
 * Adjusts the title for the title tag in the global administration panel.
 *
 * If it was in Core, it would happen directly in `wp-admin/admin-header.php`.
 *
 * @since 1.0.0
 * @access private
 *
 * @param string $admin_title Original admin title.
 * @param string $title       Original title.
 * @return string Modified admin title if in global administration panel.
 */
function _ga_adjust_admin_title( $admin_title, $title ) {
    if ( ! is_global_admin() ) {
        return $admin_title;
    }

    $new_admin_title = __( 'Global Admin', 'wp-global-admin' );

    if ( false === strpos( $admin_title, '&lsaquo;' ) ) {
        $admin_title = sprintf( __( '%1$s &#8212; WordPress' ), $new_admin_title );
    } else {
        $admin_title = sprintf( __( '%1$s &lsaquo; %2$s &#8212; WordPress' ), $title, $new_admin_title );
    }

    return $admin_title;
}
add_filter( 'admin_title', '_ga_adjust_admin_title', 10, 2 );