functions.php

<?php
/**
 * SMNTCS Retro functions and definitions
 *
 * @link https://developer.wordpress.org/themes/basics/theme-functions/
 *
 * @package WordPress
 * @subpackage SMNTCS_Retro
 * @since 1.0.0
 */

/**
 * Sets up theme defaults and registers support for various WordPress features.
 *
 * Note that this function is hooked into the after_setup_theme hook, which
 * runs before the init hook. The init hook is too late for some features, such
 * as indicating support for post thumbnails.
 *
 * @since 1.0.0
 */
function smntcs_retro_theme_support() {

	/**
	 * Add default posts and comments RSS feed links to head.
	 *
	 * @since 1.0.0
	 */
	add_theme_support( 'automatic-feed-links' );

	/**
	 * Add responsive embeds support.
	 *
	 * @since 1.8.0
	 */
	add_theme_support( 'responsive-embeds' );

	/**
	 * Set content-width.
	 *
	 * @link https://codex.wordpress.org/Content_Width
	 */
	global $content_width;
	if ( ! isset( $content_width ) ) {
		// phpcs:ignore WPThemeReview.CoreFunctionality.PrefixAllGlobals.NonPrefixedVariableFound
		$content_width = sprintf( '%dpx', get_theme_mod( 'smntcs_retro_site_width', '580' ) );
	}

	/**
	 * Enable support for post thumbnails on posts and pages.
	 *
	 * @link https://developer.wordpress.org/themes/functionality/featured-images-post-thumbnails/
	 */
	add_theme_support( 'post-thumbnails' );

	/**
	 * Set post thumbnail size.
	 *
	 * @link https://developer.wordpress.org/reference/functions/set_post_thumbnail_size/
	 */
	set_post_thumbnail_size( get_theme_mod( 'smntcs_retro_site_width', '580' ), 9999 );

	/**
	 * Enable title tag support.
	 *
	 * @link https://developer.wordpress.org/reference/functions/add_theme_support/
	 */
	add_theme_support( 'title-tag' );

	/*
	 * Enable HTML5 support.
	 *
	 * @link https://developer.wordpress.org/reference/functions/add_theme_support/
	 */
	add_theme_support(
		'html5',
		array(
			'search-form',
			'comment-form',
			'comment-list',
			'gallery',
			'caption',
			'script',
			'style',
		)
	);

	/*
	 * Load theme text domain.
	 *
	 * @link https://developer.wordpress.org/reference/functions/load_theme_textdomain/
	 */
	load_theme_textdomain( 'smntcs-retro' );

}
add_action( 'after_setup_theme', 'smntcs_retro_theme_support' );

/**
 * Include required files.
 */
require get_template_directory() . '/inc/template-tags.php';
require get_template_directory() . '/inc/theme-colors.php';
require get_template_directory() . '/inc/customizer.php';
require get_template_directory() . '/inc/customizer-general-section.php';
require get_template_directory() . '/inc/customizer-archive-section.php';
require get_template_directory() . '/inc/customizer-page-section.php';
require get_template_directory() . '/inc/customizer-post-section.php';

/**
 * Register and enqueue styles.
 *
 * @since 1.0.0
 */
function smntcs_retro_register_styles() {

	// Note, the is_IE global variable is defined by WordPress and is used
	// to detect if the current browser is internet explorer.
	global $is_IE;
	if ( $is_IE ) {
		// If IE 11 or below, use a flattened stylesheet with static values replacing CSS Variables.
		wp_enqueue_style( 'smntcs-retro-style', get_template_directory_uri() . '/assets/css/ie.css', array(), wp_get_theme()->get( 'Version' ) );
	} else {
		// If not IE, use the standard stylesheet.
		wp_enqueue_style( 'smntcs-retro-style', get_template_directory_uri() . '/style.css', array(), wp_get_theme()->get( 'Version' ) );
	}

	wp_enqueue_style( 'smntcs-retro-search-style', get_template_directory_uri() . '/search.css', array(), wp_get_theme()->get( 'Version' ) );

	// RTL styles.
	wp_style_add_data( 'smntcs-retro-style', 'rtl', 'replace' );

}
add_action( 'wp_enqueue_scripts', 'smntcs_retro_register_styles' );

/**
 * Register and enqueue scripts.
 *
 * @since 1.0.0
 */
function smntcs_retro_register_scripts() {

	if ( ( ! is_admin() ) && is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
		wp_enqueue_script( 'comment-reply' );
	}

	wp_enqueue_script( 'search-script', get_template_directory_uri() . '/assets/js/search.js', array(), '1.0.0', true );

}
add_action( 'wp_enqueue_scripts', 'smntcs_retro_register_scripts' );

/**
 * Register navigation menu.
 *
 * @since 1.0.0
 */
function smntcs_retro_menus() {

	$locations = array(
		'primary' => __( 'Primary Menu', 'smntcs-retro' ),
		'footer'  => __( 'Footer Menu', 'smntcs-retro' ),
	);

	register_nav_menus( $locations );
}
add_action( 'init', 'smntcs_retro_menus' );

/**
 * Register footer widget section
 *
 * @since 1.0.0
 */
function smntcs_retro_sidebars() {

	register_sidebar(
		array(
			'id'            => 'footer-sidebar-left',
			'name'          => __( 'Footer Sidebar Left', 'smntcs-retro' ),
			'description'   => __( 'Add widgets to the footer sidebar left.', 'smntcs-retro' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget'  => '</div>',
			'before_title'  => '<h3 class="widget-title">',
			'after_title'   => '</h3>',
		)
	);

	register_sidebar(
		array(
			'id'            => 'footer-sidebar-right',
			'name'          => __( 'Footer Sidebar Right', 'smntcs-retro' ),
			'description'   => __( 'Add widgets to the footer sidebar right.', 'smntcs-retro' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget'  => '</div>',
			'before_title'  => '<h3 class="widget-title">',
			'after_title'   => '</h3>',
		)
	);

}
add_action( 'widgets_init', 'smntcs_retro_sidebars' );


if ( ! function_exists( 'wp_body_open' ) ) {

	/**
	 * Shim for wp_body_open, ensuring backwards compatibility with versions of WordPress older than 5.2.
	 *
	 * @since 1.0.0
	 */
	function wp_body_open() {
		do_action( 'wp_body_open' );
	}
}

/**
 * Include a skip to content link at the top of the page so that users can bypass the menu.
 *
 * @since 1.0.0
 */
function smntcs_retro_skip_link() {
	echo '<a class="skip-link screen-reader-text" href="#site-content">' . __( 'Skip to the content', 'smntcs-retro' ) . '</a>'; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- core trusts translations
}
add_action( 'wp_body_open', 'smntcs_retro_skip_link', 5 );

/**
 * Sanitize checkbox field.
 *
 * @since 1.6.0
 * @param bool $checked Whether or not a box is checked.
 * @return bool True if checkbox is activated, othewise false
 */
function smntcs_retro_sanitize_checkbox( $checked ) {
	return ( ( isset( $checked ) && true === $checked ) ? true : false );
}

/**
 * Sanitize radio field.
 *
 * @param mixed $input The input to sanitize.
 * @param mixed $setting The settings object.
 * @return bool True if select field is valid, othewise false
 */
function smntcs_retro_sanitize_radio( $input, $setting ) {

	$input   = sanitize_key( $input );
	$choices = $setting->manager->get_control( $setting->id )->choices;

	return ( array_key_exists( $input, $choices ) ? $input : $setting->default );
}

/**
 * Sanitize radio field.
 *
 * @param mixed $input The input to sanitize.
 * @param mixed $setting The settings object.
 * @return bool True if select field is valid, othewise false
 */
function smntcs_retro_sanitize_select( $input, $setting ) {

	$input   = sanitize_key( $input );
	$choices = $setting->manager->get_control( $setting->id )->choices;

	return ( array_key_exists( $input, $choices ) ? $input : $setting->default );
}

/**
 * Add custom CSS to the site.
 *
 * @since 1.6.0
 * @return void
 */
function smntcs_retro_wp_head() {
	if ( get_theme_mod( 'smntcs_retro_centre_site' ) ) {
		print( '<style type="text/css">body { margin: auto; }</style>' );
	}

	if ( get_theme_mod( 'smntcs_retro_site_width' ) ) {
		printf( '<style type="text/css">body { max-width: %dpx; }</style>', (int) get_theme_mod( 'smntcs_retro_site_width' ) );
	}
}
add_action( 'wp_head', 'smntcs_retro_wp_head' );

/**
 * Load Dashicons on frontend.
 *
 * @since 1.13.0
 * @return void
 */
function smntcs_retro_wp_enqueue_scripts() {
	wp_enqueue_style( 'dashicons' );
}
add_action( 'wp_enqueue_scripts', 'smntcs_retro_wp_enqueue_scripts', 999 );