<?php
// --- Create a shortcode
// @Usage: [shortcode_name count="1"]
function theme_shortcode_add_name($args) {
    $html = '';
    $count = !empty($args['count']) ? $args['count'] : 5;
    return $html;
}
add_shortcode( 'shortcode_name', 'theme_shortcode_add_name' );

// --- Add a custom post type to REST
function theme_add_events_to_json_api() {
    $types = get_post_types(array('public' => true, '_builtin' => false));
    global $wp_post_types;
    foreach ($types as $type) {
        $wp_post_types[$type]->show_in_rest = true;
        $wp_post_types[$type]->rest_base = $type;
        $wp_post_types[$type]->rest_controller_class = 'WP_REST_Posts_Controller';
    }
}
add_action( 'init', 'theme_add_events_to_json_api', 30 );

// --- Add a menu
function theme_add_nav_menu() {
    register_nav_menus(
        array(
            'main-menu' => __( 'Main Menu', 'themename' )
        )
    );
}
add_action( 'after_setup_theme', 'theme_add_nav_menu' );

// --- Add a widget
function theme_widgets_init() {
	register_sidebar( array (
		'name' => __( 'Homepage Widget Area', 'theme' ),
		'id' => 'homepage-widget-area',
		'before_widget' => '',
		'after_widget' => '',
		'before_title' => '',
		'after_title' => '',
	) );
}
add_action( 'widgets_init', 'theme_widgets_init' );