<?php
/**
 * Custom functions that act independently of the theme templates
 *
 * @package Aplos
 * @since Aplos 1.2.0
 */

 /**
 * Get our wp_nav_menu() fallback, wp_page_menu(), to show a home link.
 *
 * @since Aplos 1.2.0
 */
function aplos_page_menu_args($args)
{
    $args['show_home'] = true;
    return $args;
}
add_filter('wp_page_menu_args', 'aplos_page_menu_args');

/**
 * Adds custom classes to the array of body classes.
 *
 * @since Aplos 1.2.0
 */
function aplos_body_classes($classes)
{
    // Adds a class of group-blog to blogs with more than 1 published author
    if (is_multi_author()) {
        $classes[] = 'group-blog';
    }

    $classes[] = get_theme_mod('layout_choices', 'twocol');

    return $classes;
}
add_filter('body_class', 'aplos_body_classes');

/**
 * Filter in a link to a content ID attribute for the next/previous image links on image attachment pages
 *
 * @since Aplos 1.2.0
 */
function aplos_enhanced_image_navigation($url, $id)
{
    if (! is_attachment() && ! wp_attachment_is_image($id)) {
        return $url;
    }

    $image = get_post($id);
    if (! empty($image->post_parent) && $image->post_parent != $id) {
        $url .= '#main';
    }

    return $url;
}
add_filter('attachment_link', 'aplos_enhanced_image_navigation', 10, 2);