functions.php

<?php
/**
 * SemPress functions and definitions
 *
 * Sets up the theme and provides some helper functions. Some helper functions
 * are used in the theme as custom template tags. Others are attached to action and
 * filter hooks in WordPress to change core functionality.
 *
 * When using a child theme (see http://codex.wordpress.org/Theme_Development and
 * http://codex.wordpress.org/Child_Themes), you can override certain functions
 * (those wrapped in a function_exists() call) by defining them first in your child theme's
 * functions.php file. The child theme's functions.php file is included before the parent
 * theme's file, so the child theme functions would be used.
 *
 * Functions that are not pluggable (not wrapped in function_exists()) are instead attached
 * to a filter or action hook. The hook can be removed by using remove_action() or
 * remove_filter() and you can attach your own function to the hook.
 *
 * For more information on hooks, actions, and filters, see http://codex.wordpress.org/Plugin_API.
 *
 * @package DoublePress
 * @since DoublePress 1.0.0
 */

/**
 * Set the content width based on the theme's design and stylesheet.
 */
if ( ! isset( $content_width ) ) {
	$content_width = 670; /* pixels */
}

/**
 * Set a default theme color array for WP.com.
 */
$themecolors = array(
	'bg' => 'f0f0f0',
	'border' => 'cccccc',
	'text' => '555555',
	'shadow' => 'ffffff',
);

if ( ! function_exists( 'sempress_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 post thumbnails.
	 *
	 * To override sempress_setup() in a child theme, add your own sempress_setup to your child theme's
	 * functions.php file.
	 */
	function sempress_setup() {
		global $themecolors;

		/**
		 * Make theme available for translation
		 * Translations can be filed in the /languages/ directory
		 * If you're building a theme based on sempress, use a find and replace
		 * to change 'sempress' to the name of your theme in all the template files
		 */
		load_theme_textdomain( 'sempress', get_template_directory() . '/languages' );

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

		// This theme uses post thumbnails
		add_theme_support( 'post-thumbnails' );
		set_post_thumbnail_size( 668, 9999 ); // Unlimited height, soft crop

		// Register custom image size for image post formats.
		add_image_size( 'sempress-image-post', 668, 1288 );

		// Switches default core markup for search form to output valid HTML5.
		add_theme_support( 'html5', array( 'search-form', 'comment-form', 'comment-list', 'gallery', 'caption', 'widgets' ) );

		// This theme uses wp_nav_menu() in one location.
		register_nav_menus( array(
			'primary' => __( 'Primary Menu', 'sempress' ),
		) );

		// Add support for the Aside, Gallery Post Formats...
		add_theme_support( 'post-formats', array( 'aside', 'gallery', 'link', 'status', 'image', 'video', 'audio', 'quote' ) );

		/**
		 * This theme supports jetpacks "infinite-scroll"
		 *
		 * @see http://jetpack.me/support/infinite-scroll/
		 */
		add_theme_support( 'infinite-scroll', array( 'container' => 'content', 'footer' => 'colophon' ) );

		/**
		 * This theme supports the "title-tag" feature
		 *
		 * @see https://make.wordpress.org/core/2014/10/29/title-tags-in-4-1/
		 */
		add_theme_support( 'title-tag' );

		/**
		 * Draw attention to supported WebSemantics
		 */
		add_theme_support( 'microformats2' );
		add_theme_support( 'microformats' );
		add_theme_support( 'microdata' );

		if ( get_theme_mod( 'sempress_columns', 'multi' ) === 'single' ) {
			$width = 670;
		} else {
			$width = 950;
		}

		// This theme supports a custom header
		$custom_header_args = array(
			'width'		 => $width,
			'height'		=> 200,
			'header-text'   => false,
		);
		add_theme_support( 'custom-header', $custom_header_args );

		// custom logo support
		add_theme_support( 'custom-logo', array(
			'height'      => 50,
			'width'       => 50,
		) );

		// This theme supports custom backgrounds
		$custom_background_args = array(
			'default-color' => $themecolors['bg'],
			'default-image' => get_template_directory_uri() . '/img/noise.png',
		);
		add_theme_support( 'custom-background', $custom_background_args );

		// Nicer WYSIWYG editor
		add_editor_style( 'css/editor-style.css' );
	}
endif; // sempress_setup

/**
 * Tell WordPress to run sempress_setup() when the 'after_setup_theme' hook is run.
 */
add_action( 'after_setup_theme', 'sempress_setup' );

/**
 * Adds "custom-color" support
 *
 * @since 1.3.0
 */
function sempress_customize_register( $wp_customize ) {
	global $themecolors;

	$wp_customize->add_section( 'sempress_settings_section', array(
		'title'	   => __( 'SemPress Settings', 'sempress' ),
		'description' => __( 'Change the look and feel of SemPress.', 'sempress' ), //Descriptive tooltip
		'priority'	=> 35,
	) );

	$wp_customize->add_setting( 'sempress_textcolor' , array(
		'default'	 => '#' . $themecolors['text'],
		'transport'   => 'refresh',
		'sanitize_callback' => 'sanitize_hex_color',
	) );

	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'sempress_textcolor', array(
		'label'	  => __( 'Text Color', 'sempress' ),
		'section'	=> 'colors',
		'settings'   => 'sempress_textcolor',
	) ) );

	$wp_customize->add_setting( 'sempress_shadowcolor' , array(
		'default'	 => '#' . $themecolors['shadow'],
		'transport'   => 'refresh',
		'sanitize_callback' => 'sanitize_hex_color',
	) );

	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'sempress_shadowcolor', array(
		'label'	  => __( 'Shadow Color', 'sempress' ),
		'section'	=> 'colors',
		'settings'   => 'sempress_shadowcolor',
	) ) );

	$wp_customize->add_setting( 'sempress_bordercolor' , array(
		'default'	 => '#' . $themecolors['border'],
		'transport'   => 'refresh',
		'sanitize_callback' => 'sanitize_hex_color',
	) );

	$wp_customize->add_control( new WP_Customize_Color_Control( $wp_customize, 'sempress_bordercolor', array(
		'label'	  => __( 'Border Color', 'sempress' ),
		'section'	=> 'colors',
		'settings'   => 'sempress_bordercolor',
	) ) );

	$wp_customize->add_setting( 'sempress_columns' , array(
		'default'	 => 'multi',
		'transport'   => 'refresh',
		'sanitize_callback' => 'sanitize_key',
	) );

	$wp_customize->add_control( 'sempress_columns', array(
		'label'	  => __( 'Page Structure', 'sempress' ),
		'section'	=> 'sempress_settings_section',
		'settings'   => 'sempress_columns',
		'type'	   => 'select',
		'choices'	=> array(
			'single' => __( 'Single Column (Sidebar at the bottom)', 'sempress' ),
			'multi'	=> __( 'Multi Column (Sidebar at the right)', 'sempress' ),
		),
	) );
}
add_action( 'customize_register', 'sempress_customize_register' );


/**
 * Adds the custom CSS to the theme-header
 *
 * @since 1.3.0
 */
function sempress_customize_css() {
	global $themecolors;
?>
	<style type="text/css" id="sempress-custom-colors">
		body { text-shadow: 0 1px 0 <?php echo get_theme_mod( 'sempress_shadowcolor', '#' . $themecolors['shadow'] ); ?>; }
		body, a { color: <?php echo get_theme_mod( 'sempress_textcolor', '#' . $themecolors['text'] ); ?>; }
		.widget, #access {
			border-bottom: 1px solid <?php echo get_theme_mod( 'sempress_bordercolor', 'inherit' ); ?>;
			-moz-box-shadow: <?php echo get_theme_mod( 'sempress_shadowcolor', 'inherit' ); ?> 0 1px 0 0;
			-webkit-box-shadow: <?php echo get_theme_mod( 'sempress_shadowcolor', 'inherit' ); ?> 0 1px 0 0;
			box-shadow: <?php echo get_theme_mod( 'sempress_shadowcolor', 'inherit' ); ?> 0 1px 0 0;
		}
		article.comment {
			border-top: 1px solid <?php echo get_theme_mod( 'sempress_shadowcolor', 'inherit' ); ?>;
			-moz-box-shadow: <?php echo get_theme_mod( 'sempress_bordercolor', 'inherit' ); ?> 0 -1px 0 0;
			-webkit-box-shadow: <?php echo get_theme_mod( 'sempress_bordercolor', 'inherit' ); ?> 0 -1px 0 0;
			box-shadow: <?php echo get_theme_mod( 'sempress_bordercolor', 'inherit' ); ?> 0 -1px 0 0;
		}
	</style>
<?php
}
add_action( 'wp_head', 'sempress_customize_css' );

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

/**
 * Register widgetized area and update sidebar with default widgets
 */
function sempress_widgets_init() {
	register_sidebar( array(
		'name' => __( 'Sidebar 1', 'sempress' ),
		'id' => 'sidebar-1',
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget' => '</section>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );

	register_sidebar( array(
		'name' => __( 'Sidebar 2', 'sempress' ),
		'id' => 'sidebar-2',
		'description' => __( 'An optional second sidebar area', 'sempress' ),
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget' => '</section>',
		'before_title' => '<h3 class="widget-title">',
		'after_title' => '</h3>',
	) );
}
add_action( 'widgets_init', 'sempress_widgets_init' );

if ( ! function_exists( 'sempress_enqueue_scripts' ) ) :
	/**
	 * Enqueue theme scripts
	 *
	 * @uses wp_enqueue_scripts() To enqueue scripts
	 *
	 * @since SemPress 1.1.1
	 */
	function sempress_enqueue_scripts() {
		/*
		 * Adds JavaScript to pages with the comment form to support sites with
		 * threaded comments (when in use).
		 */
		if ( is_singular() && comments_open() && get_option( 'thread_comments' ) ) {
			wp_enqueue_script( 'comment-reply' );
		}

		// Load the html5 shiv.
		wp_enqueue_script( 'html5', get_template_directory_uri() . '/js/html5shiv.min.js', array(), '3.7.3' );
		wp_script_add_data( 'html5', 'conditional', 'lt IE 9' );

		wp_enqueue_script( 'sempress-script', get_template_directory_uri() . '/js/functions.js', array( 'jquery' ), '1.5.1', true );

		// Loads our main stylesheet.
		wp_enqueue_style( 'sempress-style', get_stylesheet_uri() );
	}
endif;

add_action( 'wp_enqueue_scripts', 'sempress_enqueue_scripts' );

if ( ! function_exists( 'sempress_content_nav' ) ) :
	/**
	 * Display navigation to next/previous pages when applicable
	 *
	 * @since SemPress 1.0.0
	 */
	function sempress_content_nav( $nav_id ) {
		global $wp_query;

		?>
		<nav id="<?php echo $nav_id; ?>">
			<h1 class="assistive-text section-heading"><?php _e( 'Post navigation', 'sempress' ); ?></h1>

			<?php if ( is_single() ) : // navigation links for single posts ?>

				<?php previous_post_link( '<div class="nav-previous">%link</div>', '<span class="meta-nav">' . _x( '&larr;', 'Previous post link', 'sempress' ) . '</span> %title' ); ?>
				<?php next_post_link( '<div class="nav-next">%link</div>', '%title <span class="meta-nav">' . _x( '&rarr;', 'Next post link', 'sempress' ) . '</span>' ); ?>

			<?php elseif ( $wp_query->max_num_pages > 1 && ( is_home() || is_archive() || is_search() ) ) : // navigation links for home, archive, and search pages ?>

		<?php if ( get_next_posts_link() ) : ?>
		<div class="nav-previous"><?php next_posts_link( __( '<span class="meta-nav">&larr;</span> Older posts', 'sempress' ) ); ?></div>
		<?php endif; ?>

		<?php if ( get_previous_posts_link() ) : ?>
		<div class="nav-next"><?php previous_posts_link( __( 'Newer posts <span class="meta-nav">&rarr;</span>', 'sempress' ) ); ?></div>
		<?php endif; ?>

		<?php endif; ?>

		</nav><!-- #<?php echo $nav_id; ?> -->
		<?php
	}
endif; // sempress_content_nav

if ( ! function_exists( 'sempress_comment' ) ) :
	/**
	 * Template for comments and pingbacks.
	 *
	 * To override this walker in a child theme without modifying the comments template
	 * simply create your own sempress_comment(), and that function will be used instead.
	 *
	 * Used as a callback by wp_list_comments() for displaying the comments.
	 *
	 * @since SemPress 1.0.0
	 */
	function sempress_comment( $comment, $args, $depth ) {
		$GLOBALS['comment'] = $comment;

		switch ( $comment->comment_type ) :
			case 'pingback' :
			case 'trackback' :
			case 'webmention' :
	?>
		<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
			<article id="comment-<?php comment_ID(); ?>" class="comment <?php $comment->comment_type; ?>" itemprop="comment" itemscope itemtype="http://schema.org/Comment">
				<div class="comment-content p-summary p-name" itemprop="text name description">
					<?php comment_text(); ?>
				</div>
				<footer>
					<div class="comment-meta commentmetadata">
						<address class="comment-author p-author author vcard hcard h-card" itemprop="creator" itemscope itemtype="http://schema.org/Person">
							<?php printf( '<cite class="fn p-name" itemprop="name">%s</cite>', get_comment_author_link() ); ?>
						</address>
						<span class="sep">-</span>
						<a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>"><time class="updated published dt-updated dt-published" datetime="<?php comment_time( 'c' ); ?>" itemprop="datePublished dateModified dateCreated">
						<?php
						/* translators: 1: date, 2: time */
						printf( __( '%1$s at %2$s', 'sempress' ), get_comment_date(), get_comment_time() ); ?>
						</time></a>
						<?php edit_comment_link( __( '(Edit)', 'sempress' ), ' ' ); ?>
					</div>
				</footer>
			</article>
		<?php
				break;
			default :
		?>
		<li <?php comment_class(); ?> id="li-comment-<?php comment_ID(); ?>">
			<article id="comment-<?php comment_ID(); ?>" class="comment <?php $comment->comment_type; ?>" itemprop="comment" itemscope itemtype="http://schema.org/Comment">
				<footer>
					<address class="comment-author p-author author vcard hcard h-card" itemprop="creator" itemscope itemtype="http://schema.org/Person">
				<?php echo get_avatar( $comment, 50 ); ?>
				<?php printf( __( '%s <span class="says">says:</span>', 'sempress' ), sprintf( '<cite class="fn p-name" itemprop="name">%s</cite>', get_comment_author_link() ) ); ?>
					</address><!-- .comment-author .vcard -->
					<?php if ( '0' === $comment->comment_approved ) : ?>
						<em><?php _e( 'Your comment is awaiting moderation.', 'sempress' ); ?></em>
						<br />
					<?php endif; ?>

					<div class="comment-meta commentmetadata">
						<a href="<?php echo esc_url( get_comment_link( $comment->comment_ID ) ); ?>"><time class="updated published dt-updated dt-published" datetime="<?php comment_time( 'c' ); ?>" itemprop="datePublished dateModified dateCreated">
						<?php
						/* translators: 1: date, 2: time */
						printf( __( '%1$s at %2$s', 'sempress' ), get_comment_date(), get_comment_time() ); ?>
						</time></a>
						<?php edit_comment_link( __( '(Edit)', 'sempress' ), ' ' ); ?>
					</div><!-- .comment-meta .commentmetadata -->
				</footer>

				<div class="comment-content e-content p-summary p-name" itemprop="text name description"><?php comment_text(); ?></div>

				<div class="reply">
					<?php comment_reply_link( array_merge( $args, array( 'depth' => $depth, 'max_depth' => $args['max_depth'] ) ) ); ?>
				</div><!-- .reply -->
			</article><!-- #comment-## -->
		<?php
				break;
			endswitch;
	}
endif; // ends check for sempress_comment()

if ( ! function_exists( 'sempress_posted_on' ) ) :
	/**
	 * Prints HTML with meta information for the current post-date/time and author.
	 * Create your own sempress_posted_on to override in a child theme
	 *
	 * @since SemPress 1.0.0
	 */
	function sempress_posted_on() {
		printf( __( '<span class="sep">Posted on </span><a href="%1$s" title="%2$s" rel="bookmark" class="url u-url"><time class="entry-date updated published dt-updated dt-published" datetime="%3$s" itemprop="dateModified datePublished">%4$s</time></a><address class="byline"> <span class="sep"> by </span> <span class="author p-author vcard hcard h-card" itemprop="author " itemscope itemtype="http://schema.org/Person">%5$s <a class="url uid u-url u-uid fn p-name" href="%6$s" title="%7$s" rel="author" itemprop="url"><span itemprop="name">%8$s</span></a></span></address>', 'sempress' ),
			esc_url( get_permalink() ),
			esc_attr( get_the_time() ),
			esc_attr( get_the_date( 'c' ) ),
			esc_html( get_the_date() ),
			get_avatar( get_the_author_meta( 'ID' ), 40 ),
			esc_url( get_author_posts_url( get_the_author_meta( 'ID' ) ) ),
			esc_attr( sprintf( __( 'View all posts by %s', 'sempress' ), get_the_author() ) ),
			esc_html( get_the_author() )
		);
	}
endif;

/**
 * Adds post-thumbnail support :)
 *
 * @since SemPress 1.0.0
 */
function sempress_the_post_thumbnail( $before = '', $after = '' ) {
	if ( '' != get_the_post_thumbnail() ) {
		$image = wp_get_attachment_image_src( get_post_thumbnail_id(), 'post-thumbnail' );
		$class = '';

		if ( $image['1'] < '300' ) {
			$class = 'alignright';
		}

		echo $before;
		the_post_thumbnail( 'post-thumbnail', array( 'class' => $class . ' photo u-photo', 'itemprop' => 'image' ) );
		echo $after;
	}
}

/**
 * Adjusts content_width value for full-width and single image attachment
 * templates, and when there are no active widgets in the sidebar.
 *
 * @since SemPress 1.3.0
 */
function sempress_content_width() {
	if ( is_page_template( 'full-width-page.php' ) || is_attachment() || ! is_active_sidebar( 'sidebar-1' ) ) {
		global $content_width;
		$content_width = 880;
	}

	/*
	if ( has_post_format( 'image' ) || has_post_format( 'video' ) || is_attachment() ) {
		global $content_width;
		$content_width = 668;
	}
	*/
}
add_action( 'template_redirect', 'sempress_content_width' );

/**
 * replace post-title with id when empty
 *
 * @since SemPress 1.4.6
 *
 * @param string $title the post-title
 * @param int $id the post-id
 * @return string the filtered post-title
 */
function sempress_the_title( $title, $id ) {
	// if title is empty, return the id
	if ( empty( $title ) ) {
		return "#$id";
	}

	return $title;
}
add_filter( 'the_title', 'sempress_the_title', 10, 2 );


/**
 * Filter in a link to a content ID attribute for the next/previous image links on
 * image attachment pages
 *
 * @param string $url
 * @return string
 */
function sempress_enhanced_image_navigation( $url ) {
	if ( is_admin() ) {
		return $url;
	}

	global $post, $wp_rewrite;

	$id = (int) $post->ID;
	$object = get_post( $id );
	if ( wp_attachment_is_image( $post->ID ) && ( $wp_rewrite->using_permalinks() && ( $object->post_parent > 0 ) && ( $object->post_parent !== $id ) ) ) {
		$url = $url . '#main';
	}

	return $url;
}
add_filter( 'attachment_link', 'sempress_enhanced_image_navigation' );

/**
 * Add a pingback url auto-discovery header for singularly identifiable articles.
 */
function sempress_pingback_header() {
	if ( is_singular() && pings_open() ) {
		printf( '<link rel="pingback" href="%s">' . PHP_EOL, get_bloginfo( 'pingback_url' ) );
	}
}
add_action( 'wp_head', 'sempress_pingback_header' );

/**
 * Display the id for the post div.
 *
 * @param string $id.
 */
function sempress_post_id( $post_id = null ) {
	if ( $post_id ) {
		echo 'id="' . $post_id  . '"';
	} else {
		echo 'id="' . sempress_get_post_id()  . '"';
	}
}

/**
 * Retrieve the id for the post div.
 *
 * @return string The post-id.
 */
function sempress_get_post_id() {
	$post_id = 'post-' . get_the_ID();

	return apply_filters( 'sempress_post_id', $post_id, get_the_ID() );
}

/**
 * Adds some awesome websemantics like microformats(2) and microdata
 */
require( get_template_directory() . '/inc/semantics.php' );

/**
 * Adds back compat handling for older WP versions
 */
require( get_template_directory() . '/inc/compat.php' );

/**
 * This theme was built with PHP, Semantic HTML, CSS, love, and SemPress.
 */


// For allowing exotic webmentions on homepages and archive pages
function handle_exotic_webmentions($id, $target) {
    $homepage_id = 11;
    $mentions_page_id = 283;

    // If $id is homepage, reset to mentions page
    if ($id == $homepage_id) {
        return $mentions_page_id;
    }

    // do nothing if id is set
    if ($id) {
        return $id;
    }

    // return "default" id if plugin can't find a post/page
    return $mentions_page_id;
}

add_filter("webmention_post_id", "handle_exotic_webmentions", 10, 2);

// Callback for micropub_syndicate-to filter hook provided by the Micropub plugin.
// Adds in a syndication target for the social.coop mastodon instance.
function add_mastodon_syndication_target($synd_urls, $user_id)
{
    $masto_target['uid'] = "social_coop";
    $masto_target['name'] = "social.coop";
    $synd_urls[] = $masto_target;

    return $synd_urls;
}

add_filter("micropub_syndicate-to", "add_mastodon_syndication_target", 10, 2);


// Callback for the micropub_syndication filter hook provided by the Micropub plugin.
// Syndicates posts to the social.coop mastodon instance.
function syndicate_to_mastodon($ID, $syndicate_to)
{
    $post = get_post($ID);
    $message = $post->post_content;
    foreach ($syndicate_to as $syndication_target_uid) {
        if ($syndication_target_uid === 'social_coop') {
            $instance = get_option( 'autopostToMastodon-instance' );
            $access_token = get_option('autopostToMastodon-token');
            $mode = get_option( 'autopostToMastodon-mode', 'public' );
            $client = new Client($instance, $access_token);
            $toot = $client->postStatus($message, $mode);
        }
    }
}

add_filter("micropub_syndication", "syndicate_to_mastodon", 10, 2);

// turn off yoast's title rewriting
// see: https://stackoverflow.com/a/22426152
add_action( 'init', function () {
    $wpseo_front = WPSEO_Frontend::get_instance();

    remove_filter( 'pre_get_document_title', array( $wpseo_front, 'title' ), 15 );
    remove_filter( 'wp_title', array( $wpseo_front, 'title' ), 15 );
} );

wp_embed_register_handler( 'ytnocookie', '#https?://www\.youtube\-nocookie\.com/embed/([a-z0-9\-_]+)#i', 'wp_embed_handler_ytnocookie' );
wp_embed_register_handler( 'ytnormal', '#https?://www\.youtube\.com/watch\?v=([a-z0-9\-_]+)#i', 'wp_embed_handler_ytnocookie' );
wp_embed_register_handler( 'ytnormal2', '#https?://www\.youtube\.com/watch\?feature=player_embedded&amp;v=([a-z0-9\-_]+)#i', 'wp_embed_handler_ytnocookie' );

function wp_embed_handler_ytnocookie( $matches, $attr, $url, $rawattr ) {
    global $defaultoptions;

    $defaultoptions['yt-content-width'] = '680';
    $defaultoptions['yt-content-height'] = '510';
    $defaultoptions['yt-norel'] = 1;
    $relvideo = '';

    if ($defaultoptions['yt-norel']==1) {
        $relvideo = '?rel=0';
    }

    $embed = sprintf(
      '<iframe src="https://www.youtube-nocookie.com/embed/%2$s%5$s" width="%3$spx" height="%4$spx" frameborder="0" scrolling="no" marginwidth="0" marginheight="0"></iframe>',
       get_template_directory_uri(),
       esc_attr($matches[1]),
       $defaultoptions['yt-content-width'],
       $defaultoptions['yt-content-height'],
       $relvideo
    );

    return apply_filters( 'embed_ytnocookie', $embed, $matches, $attr, $url, $rawattr );
}

// see: https://github.com/ngm/doubleloop.net/issues/4
add_filter('the_content', 'wrapPostContentWithContentMicroformats', 15, 2);
function wrapPostContentWithContentMicroformats($content) {
    return '<div class="p-name p-content e-content">' . $content . '</div>';
}

wp_embed_register_handler( 'invidious_watch', '#https?://invidio\.us/watch\?v=([A-Za-z0-9\-_]+)#i', 'wp_embed_handler_invidious' );
wp_embed_register_handler( 'invidious_embed', '#https?://invidio\.us/embed/([A-Za-z0-9\-_]+)#i', 'wp_embed_handler_invidious' );
function wp_embed_handler_invidious( $matches, $attr, $url, $rawattr ) {
    $embed = sprintf(
        '<iframe src="https://invidio.us/embed/%1$s" frameborder="0" scrolling="no" marginwidth="0" marginheight="0" width="600" height="400"></iframe>',
        esc_attr($matches[1])
    );

    return $embed;
}