functions.php

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

/**
 * This theme only works in WordPress 5.3 or later.
 */
if ( version_compare( $GLOBALS['wp_version'], '5.3', '<' ) ) {
	require get_template_directory() . '/inc/back-compat.php';
	return;
}

if ( ! function_exists( 'twenty_twenty_one_setup' ) ) :
	/**
	 * 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.
	 */
	function twenty_twenty_one_setup() {
		/*
		 * Make theme available for translation.
		 * Translations can be filed in the /languages/ directory.
		 * If you're building a theme based on Twenty Twenty One, use a find and replace
		 * to change 'twentytwentyone' to the name of your theme in all the template files.
		 */
		load_theme_textdomain( 'twentytwentyone', get_template_directory() . '/languages' );

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

		/*
		 * Let WordPress manage the document title.
		 * By adding theme support, we declare that this theme does not use a
		 * hard-coded <title> tag in the document head, and expect WordPress to
		 * provide it for us.
		 */
		add_theme_support( 'title-tag' );

		/*
		 * 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( 1568, 9999 );

		register_nav_menus(
			array(
				'primary' => __( 'Primary Navigation', 'twentytwentyone' ),
			)
		);

		/*
		 * Switch default core markup for search form, comment form, and comments
		 * to output valid HTML5.
		 */
		add_theme_support(
			'html5',
			array(
				'search-form',
				'comment-form',
				'comment-list',
				'gallery',
				'caption',
				'style',
				'script',
			)
		);

		/**
		 * Add support for core custom logo.
		 *
		 * @link https://codex.wordpress.org/Theme_Logo
		 */
		add_theme_support(
			'custom-logo',
			array(
				'height'      => 240, //TODO: Is this the correct logo size?
				'width'       => 240,
				'flex-width'  => false,
				'flex-height' => false,
			)
		);

		// Add theme support for selective refresh for widgets.
		add_theme_support( 'customize-selective-refresh-widgets' );

		// Add support for Block Styles.
		add_theme_support( 'wp-block-styles' );

		// Add support for full and wide align images.
		add_theme_support( 'align-wide' );

		// Add support for editor styles.
		add_theme_support( 'editor-styles' );

		$editor_stylesheet_path = './assets/css/style-editor.css';

		// 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 ) {
			$editor_stylesheet_path = './assets/css/ie-editor.css';
		}

		// Enqueue editor styles.
		add_editor_style( $editor_stylesheet_path );

		// Add custom editor font sizes.
		add_theme_support(
			'editor-font-sizes',
			array(
				array(
					'name'      => __( 'Tiny', 'twentytwentyone' ),
					'shortName' => __( 'XS', 'twentytwentyone' ),
					'size'      => 14,
					'slug'      => 'tiny',
				),
				array(
					'name'      => __( 'Small', 'twentytwentyone' ),
					'shortName' => __( 'S', 'twentytwentyone' ),
					'size'      => 16,
					'slug'      => 'small',
				),
				array(
					'name'      => __( 'Normal', 'twentytwentyone' ),
					'shortName' => __( 'M', 'twentytwentyone' ),
					'size'      => 18,
					'slug'      => 'normal',
				),
				array(
					'name'      => __( 'Large', 'twentytwentyone' ),
					'shortName' => __( 'L', 'twentytwentyone' ),
					'size'      => 24,
					'slug'      => 'large',
				),
				array(
					'name'      => __( 'Huge', 'twentytwentyone' ),
					'shortName' => __( 'XL', 'twentytwentyone' ),
					'size'      => 28,
					'slug'      => 'huge',
				),
			)
		);

		// Custom background color.
		add_theme_support(
			'custom-background',
			array(
				'default-color' => 'd1e4dd',
			)
		);

		// Editor color palette.
		$primary    = '#28303D';
		$secondary  = '#39414D';
		$mint       = '#D1E4DD';

		add_theme_support(
			'editor-color-palette',
			array(
				array(
					'name'  => __( 'Primary', 'twentytwentyone' ),
					'slug'  => 'primary',
					'color' => $primary,
				),
				array(
					'name'  => __( 'Secondary', 'twentytwentyone' ),
					'slug'  => 'secondary',
					'color' => $secondary,
				),
				array(
					'name'  => __( 'Mint', 'twentytwentyone' ),
					'slug'  => 'mint',
					'color' => $mint,
				),
			)
		);

		/* TODO: No gradients are currently included.
		add_theme_support(
			'editor-gradient-presets',
			array(
				array(
					'name'     => __( '', 'twentytwentyone' ),
					'gradient' => '',
					'slug'     => '',
				),
			)
		);
		*/

		/*
		* Adds starter content to highlight the theme on fresh sites.
		* This is done conditionally to avoid loading the starter content on every
		* page load, as it is a one-off operation only needed once in the customizer.
		*/
		if ( is_customize_preview() ) {
			require get_template_directory() . '/inc/starter-content.php';
			add_theme_support( 'starter-content', twenty_twenty_one_get_starter_content() );
		}

		// Add support for responsive embedded content.
		add_theme_support( 'responsive-embeds' );

		// Add support for custom line height controls.
		add_theme_support( 'custom-line-height' );

		// Add support for experimental link color control.
		add_theme_support( 'experimental-link-color' );

		// Add support for experimental cover block spacing.
		add_theme_support( 'experimental-custom-spacing' );

		// Add support for custom units.
		add_theme_support( 'custom-units' );
	}
endif;
add_action( 'after_setup_theme', 'twenty_twenty_one_setup' );

/**
 * Register widget area.
 *
 * @link https://developer.wordpress.org/themes/functionality/sidebars/#registering-a-sidebar
 */
function twenty_twenty_one_widgets_init() {

	register_sidebar(
		array(
			'name'          => __( 'Footer', 'twentytwentyone' ),
			'id'            => 'sidebar-1',
			'description'   => __( 'Add widgets here to appear in your footer.', 'twentytwentyone' ),
			'before_widget' => '<section id="%1$s" class="widget %2$s">',
			'after_widget'  => '</section>',
			'before_title'  => '<h2 class="widget-title">',
			'after_title'   => '</h2>',
		)
	);
}
add_action( 'widgets_init', 'twenty_twenty_one_widgets_init' );

/**
 * Set the content width in pixels, based on the theme's design and stylesheet.
 *
 * Priority 0 to make it available to lower priority callbacks.
 *
 * @global int $content_width Content width.
 */
function twenty_twenty_one_content_width() {
	// This variable is intended to be overruled from themes.
	// Open WPCS issue: {@link https://github.com/WordPress-Coding-Standards/WordPress-Coding-Standards/issues/1043}.
	// phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedVariableFound
	$GLOBALS['content_width'] = apply_filters( 'twenty_twenty_one_content_width', 750 );
}
add_action( 'after_setup_theme', 'twenty_twenty_one_content_width', 0 );

/**
 * Enqueue scripts and styles.
 */
function twenty_twenty_one_scripts() {
	// 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( 'twenty-twenty-one-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( 'twenty-twenty-one-style', get_template_directory_uri() . '/style.css', array(), wp_get_theme()->get( 'Version' ) );
	}

	// RTL styles.
	wp_style_add_data( 'twenty-twenty-one-style', 'rtl', 'replace' );

	// Print styles.
	wp_enqueue_style( 'twenty-twenty-one-print-style', get_template_directory_uri() . '/assets/css/print.css', array(), wp_get_theme()->get( 'Version' ), 'print' );

	// Threaded comment reply styles.
	if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
		wp_enqueue_script( 'comment-reply' );
	}

	// Main navigation scripts.
	wp_enqueue_script( 'twenty-twenty-one-primary-navigation-script', get_template_directory_uri() . '/assets/js/primary-navigation.js', array(), wp_get_theme()->get( 'Version' ), true );
}
add_action( 'wp_enqueue_scripts', 'twenty_twenty_one_scripts' );

/**
 * Fix skip link focus in IE11.
 *
 * This does not enqueue the script because it is tiny and because it is only for IE11,
 * thus it does not warrant having an entire dedicated blocking script being loaded.
 *
 * @link https://git.io/vWdr2
 */
function twenty_twenty_one_skip_link_focus_fix() {
	// The following is minified via `terser --compress --mangle -- js/skip-link-focus-fix.js`.
	?>
	<script>
	/(trident|msie)/i.test(navigator.userAgent)&&document.getElementById&&window.addEventListener&&window.addEventListener("hashchange",function(){var t,e=location.hash.substring(1);/^[A-z0-9_-]+$/.test(e)&&(t=document.getElementById(e))&&(/^(?:a|select|input|button|textarea)$/i.test(t.tagName)||(t.tabIndex=-1),t.focus())},!1);
	</script>
	<?php
}
add_action( 'wp_print_footer_scripts', 'twenty_twenty_one_skip_link_focus_fix' );


// Custom CSS.
require get_template_directory() . '/inc/custom-css.php';

// Non-latin language handling.
require get_template_directory() . '/classes/class-twenty-twenty-one-non-latin-languages.php';

/** Enqueue non-latin language styles
 *
 * @since 1.0.0
 *
 * @return void
 */
function twenty_twenty_one_non_latin_languages() {
	$custom_css = Twenty_Twenty_One_Non_Latin_Languages::get_non_latin_css( 'front-end' );

	if ( $custom_css ) {
		wp_add_inline_style( 'twenty-twenty-one-style', $custom_css );
	}
}

add_action( 'wp_enqueue_scripts', 'twenty_twenty_one_non_latin_languages' );

/**
 * SVG Icons class.
 */
require get_template_directory() . '/classes/class-twenty-twenty-one-svg-icons.php';

/**
 * Custom color classes.
 */
require get_template_directory() . '/vendor/aristath/ari-color/aricolor.php';
require get_template_directory() . '/classes/class-twenty-twenty-one-custom-colors.php';

/**
 * Enhance the theme by hooking into WordPress.
 */
require get_template_directory() . '/inc/template-functions.php';

/**
 * Menu functions and filters.
 */
require get_template_directory() . '/inc/menu-functions.php';

/**
 * SVG Icons related functions.
 */
require get_template_directory() . '/inc/icon-functions.php';

/**
 * Custom template tags for the theme.
 */
require get_template_directory() . '/inc/template-tags.php';

/**
 * Customizer additions.
 */
require get_template_directory() . '/inc/customizer.php';

/**
 * Block Patterns.
 */
require get_template_directory() . '/inc/block-patterns.php';

/**
 * Block Styles.
 */
require get_template_directory() . '/inc/block-styles.php';