functions.php

<?php

/**
 * UCSC functions and definitions
 *
 * @link https://developer.wordpress.org/themes/basics/theme-functions/
 *
 * @package UCSC
 * @since UCSC 1.0.0
 */

if (!function_exists('ucsc_setup')):
	/**
	 * Sets up theme defaults and registers support for various WordPress features.
	 *
	 * @since UCSC 1.0.0
	 *
	 * @return void
	 */
	function ucsc_setup()
	{
		add_theme_support('wp-block-styles');
		add_editor_style('build/style-index.css');

		/**
		 * Register primary navigation menu location
		 */
		register_nav_menus([
			'primary' => __('Primary Navigation', 'ucsc-2022'),
		]);

		/*
		 * Load additional Core block styles.
		 */
		$styled_blocks = [
			'core/button',
			'core/columns',
			'core/post-template',
			'core/post-author',
			'core/site-title',
			'core/query-pagination',
			'core/post-content',
			'core/rss',
			'core/post-title',
			'core/post-comments',
			'core/navigation',
			'core/list',
			'core/separator',
			'core/latest-posts',
			'core/quote',
			'core/image',
			'core/search',
			'core/paragraph',
			'ucscblocks/accordion',
			'core/details',
			'outermost/icon-block',
		];
		foreach ($styled_blocks as $block) {
			$name = explode('/', $block);
			$args = [
				'handle' => "ucsc-$name[1]",
				'src' => get_theme_file_uri("wp-blocks/$name[1].css"),
				($args['path'] = get_theme_file_path("wp-blocks/$name[1].css")),
			];
			wp_enqueue_block_style($block, $args);
		}

		/**
		 * Include ThemeHybrid/HyridBreadcrumbs Class
		 * see: https://github.com/themehybrid/hybrid-breadcrumbs
		 * and https://themehybrid.com/weblog/integrating-hybrid-breadcrumbs-into-wordpress-themes
		 */
		if (file_exists(get_parent_theme_file_path('vendor/autoload.php'))) {
			include_once get_parent_theme_file_path('vendor/autoload.php');
		}
	}
endif;
add_action('after_setup_theme', 'ucsc_setup');

/**
 * Add Favicons
 * See: https://evilmartians.com/chronicles/how-to-favicon-in-2021-six-files-that-fit-most-needs
 */
function ucsc_favicons()
{
?>

	<link rel="shortcut icon" href="<?php echo esc_url(
																		get_stylesheet_directory_uri()
																	); ?>/images/favicons/favicon-32x32.png" type="image/png" sizes="any">
	<link rel="shortcut icon" href="<?php echo esc_url(
																		get_stylesheet_directory_uri()
																	); ?>/images/favicons/ucsc-favicon.svg" type="image/svg+xml">
	<link rel="apple-touch-icon" href="<?php echo esc_url(
																				get_stylesheet_directory_uri()
																			); ?>/images/favicons/apple-icon.png">
	<link rel="manifest" href="<?php echo esc_url(
																get_stylesheet_directory_uri()
															); ?>/images/favicons/manifest.webmanifest">

<?php
}
add_action('wp_head', 'ucsc_favicons');

/**
 * Enqueue theme scripts and styles.
 */
function ucsc_scripts()
{
	wp_enqueue_style(
		'ucsc-styles',
		get_stylesheet_uri(),
		[],
		wp_get_theme()->get('Version')
	);
	wp_enqueue_style(
		'ucsc-styles-scss',
		get_template_directory_uri() . '/build/style-index.css',
		[],
		wp_get_theme()->get('Version')
	);
	wp_enqueue_style(
		'ucsc-google-roboto-font',
		'https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,600,700,800&display=swap',
		false
	);
	wp_enqueue_style('dashicons');
	wp_register_script(
		'ucsc-front',
		get_template_directory_uri() . '/build/theme.js',
		[],
		wp_get_theme()->get('Version'),
		true
	);
	wp_enqueue_script('ucsc-front');
}
add_action('wp_enqueue_scripts', 'ucsc_scripts');

/**
 * Enqueue additional Google Font Scripts
 */
function ucsc_googleapi_scripts()
{
	echo '<link rel="preconnect" href="https://fonts.googleapis.com">';
	echo '<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>';
}
add_action('wp_head', 'ucsc_googleapi_scripts');

/**
 * Enqueue editor styles and scripts.
 */
function ucsc_add_admin_scripts()
{
	wp_register_script(
		'ucsc-admin-scripts',
		get_template_directory_uri() . '/build/theme.js',
		[],
		wp_get_theme()->get('Version'),
		true
	);
	wp_enqueue_script('ucsc-admin-scripts');
}
add_action('admin_enqueue_scripts', 'ucsc_add_admin_scripts');

/**
 * Set accessible site title tags
 * The core/site-title should be an `h1` on the home page and `p` on all other pages.
 * The core/page-title should be an `h1` on all internal pages.
 *
 * @param  string $block_content 	Block content to be rendered.
 * @param  array  $block         	Block attributes.
 */
function ucsc_modify_site_title($block_content, $block)
{
	// We capture the HTML tag in the site-title block content
	$pattern = '/<(p|h\\d) (.*)<\/(p|h\\d)>/';

	if (is_front_page()) {
		// If we're on the home page, we make the site-title an <h1>
		$replacement = '<h1 $2</h1>';
		$block_content = preg_replace($pattern, $replacement, $block_content);
	} else {
		// If we're on an internal page, we make the site-title a <p>
		$replacement = '<p $2</p>';
		$block_content = preg_replace($pattern, $replacement, $block_content);
	}

	// After we modify the site title in the header, we remove this filter to prevent
	// it from running on any other instance of the core/site-title block
	remove_filter('render_block_core/site-title', 'ucsc_modify_site_title', 10);
	return $block_content;
}
add_filter('render_block_core/site-title', 'ucsc_modify_site_title', 10, 2);

/**
 * Add author link to Post Author on
 * Single Blog Post
 *
 * @param  string $block_content Block content to be rendered.
 * @param  array  $block         Block attributes.
 * @return string
 */
function ucsc_post_author_link($block_content = '', $block = [])
{
	// Check for single post; use `global $post` to access data outide the Loop.
	if (is_singular()) {
		if (
			isset($block['blockName']) &&
			'core/post-author-name' === $block['blockName']
		) {
			if (function_exists('coauthors_posts_links')) {
				$block_content = coauthors_posts_links(
					null,
					null,
					null,
					null,
					false
				);
			}
		}
	}
	return $block_content;
}
add_filter('render_block', 'ucsc_post_author_link', 8, 2);

/**
 * Add Subtitle meta field
 * Single Blog Post
 *
 * @param  string $block_content Block content to be rendered.
 * @param  array  $block         Block attributes.
 * @return string
 */
function ucsc_post_subtitle($block_content = '', $block = [])
{
	// Check for single post; use `global $post` to access data outide the Loop.
	if (is_single()) {
		global $post;
		$post_id = get_the_id();
		if (function_exists('get_field')) {
			$subtitle = get_field('subtitle-copy');
		}

		if (
			'' !== $subtitle &&
			isset($block['blockName']) &&
			'core/post-title' === $block['blockName']
		) {
			$html = str_replace(
				$block_content,
				$block_content .
					'<div id="post-subtitle-' .
					$post_id .
					'" class="post-subtitle">
					<p class="post-subtitle-text">' .
					$subtitle .
					'</p></div>',
				$block_content
			);
			return $html;
		}
	}
	return $block_content;
}
add_filter('render_block', 'ucsc_post_subtitle', 10, 2);

/**
 * Breadcrumbs constructor callback helper
 *
 * @return string
 */
function ucsc_breadcrumbs_constructor()
{
	$labels = [
		'title' => '',
	];
	$args = [
		'labels' => $labels,
		'show_on_front' => true,
		'show_trail_end' => true,
		'list_tag'        => 'ol',
		'container_class' => 'ucsc-page-header__breadcrumbs',
	];
	return Hybrid\Breadcrumbs\Trail::render($args);
}

/**
 * Register Advanced Custom Fields
 */
if (file_exists(get_theme_file_path('lib/acf.php'))) {
	include get_theme_file_path('lib/acf.php');
}

/**
 * Register Block Pattern Customizations
 */
if (file_exists(get_theme_file_path('lib/blocks.php'))) {
	include get_theme_file_path('lib/blocks.php');
}

/**
 * Register Image Sizes
 */
if (file_exists(get_theme_file_path('lib/image_sizes.php'))) {
	include get_theme_file_path('lib/image_sizes.php');

	add_action('after_setup_theme', function () {
		$images = new Image_Sizes();
		$images->register_sizes();
		$images->register_size_names();
		$images->get_sizes();
	});
}

/**
 * Enqueue theme block editor style script to modify the "styles" available for blocks in the editor.
 */
function ucsc_block_editor_scripts()
{
	wp_enqueue_script(
		'ucsc-editor',
		get_theme_file_uri('/wp-blocks/styles.js'),
		['wp-blocks', 'wp-dom'],
		wp_get_theme()->get('Version'),
		true
	);
}
add_action('enqueue_block_editor_assets', 'ucsc_block_editor_scripts');

/**
 * Add Truss global header and global footer components
 */
add_action('wp_body_open', 'ucsc_add_custom_body_open_code');

function ucsc_add_custom_body_open_code()
{
	if (function_exists('get_field')) {
		$should_use_logo =
			get_field('toggle_universal_logo_visibility', 'options') ?? 'true';

		// Convert boolean value to string. Trss header accepts only string value
		if (is_bool($should_use_logo)) {
			$should_use_logo = json_encode($should_use_logo);
		}
	}

	echo sprintf(
		'<trss-ucsc-header use-logo="%s" search-action="/" search-query="s" style="--trss-content-width:80rem;"></trss-ucsc-header>',
		$should_use_logo ?? 'true'
	);
}

add_action('wp_footer', 'ucsc_add_custom_body_close_code');

function ucsc_add_custom_body_close_code()
{
	echo '<trss-ucsc-footer style="--trss-content-width:80rem;"></trss-ucsc-footer>';
}

add_action('wp_footer', 'ucsc_truss_assets');

function ucsc_truss_assets()
{
?>

	<!-- Script and style to include our components library, Truss.  -->
	<script type="module" src="https://unpkg.com/@ucsantacruz/truss@0.8.2/dist/ucsc-trss/ucsc-trss.esm.js"></script>
	<link rel="stylesheet" href="https://unpkg.com/@ucsantacruz/truss@0.8.2/dist/ucsc-trss/ucsc-trss.css">
<?php
}

add_action('wp_footer', 'ucsc_last_modified', 10);

function ucsc_last_modified()
{
	echo '<!-- Last modified code.  --><div class="last-modified__outer" role="region" aria-label="Page last modification date" ><div class="last-modified__inner"><div class="last-modified" >Last modified: ';
	echo do_shortcode('[last-modified]');
	echo '</div></div></div><!-- End last modified code.  -->';
}
/**
 * Add Excerpts to Pages
 */
add_post_type_support('page', 'excerpt');

/**
 * Remove default skip link and add a custom one.
 */
remove_action('wp_footer', 'the_block_template_skip_link');

/**
 * Override the default skip link to pass a11y for landmarks.
 * @return void
 */
function ucsc_skip_link()
{
	/**
	 * Print the skip-link styles.
	 */
?>
	<style id="skip-link-styles">
		.skip-link.screen-reader-text {
			border: 0;
			clip: rect(1px, 1px, 1px, 1px);
			clip-path: inset(50%);
			height: 1px;
			margin: -1px;
			overflow: hidden;
			padding: 0;
			position: absolute !important;
			width: 1px;
			word-wrap: normal !important;
		}

		.skip-link.screen-reader-text:focus {
			background-color: #eee;
			clip: auto !important;
			clip-path: none;
			color: #444;
			display: block;
			font-size: 1em;
			height: auto;
			left: 5px;
			line-height: normal;
			padding: 15px 23px 14px;
			text-decoration: none;
			top: 5px;
			width: auto;
			z-index: 100000;
		}
	</style>

	<?php /**
	 * Print the skip-link script.
	 */
	?>
	<script>
		(function() {
			var skipLinkTarget = document.querySelector('main'),
				sibling,
				skipLinkTargetID,
				skipLink;

			// Early exit if a skip-link target can't be located.
			if (!skipLinkTarget) {
				return;
			}

			// Get the site wrapper.
			// The skip-link will be injected in the beginning of it.
			sibling = document.body.firstChild;

			// Early exit if the root element was not found.
			if (!sibling) {
				return;
			}

			// Get the skip-link target's ID, and generate one if it doesn't exist.
			skipLinkTargetID = skipLinkTarget.id;
			if (!skipLinkTargetID) {
				skipLinkTargetID = 'wp--skip-link--target';
				skipLinkTarget.id = skipLinkTargetID;
			}

			// Create a block level element to contain the skip link.
			skipLinkContainer = document.createElement('div');
			skipLinkContainer.setAttribute('role', 'navigation');

			// Create the skip link.
			skipLink = document.createElement('a');
			skipLink.setAttribute('aria-label', 'skip to content');
			skipLink.classList.add('skip-link', 'screen-reader-text');
			skipLink.href = '#' + skipLinkTargetID;
			skipLink.innerHTML = '<?php /* translators: Hidden accessibility text. */ esc_html_e(
															'Skip to content'
														); ?>';

			skipLinkContainer.append(skipLink);

			// Inject the skip link.
			sibling.parentElement.insertBefore(skipLinkContainer, sibling);
		}());
	</script>
<?php
}

add_action('wp_footer', 'ucsc_skip_link');