frontend.php

<?php

use zz\Html\HTMLMinify;

/**
 * Frontend usefull hooks.
 *
 * @package CleanWordPress\Frontend
 * @since Clean WordPress 1.1.0
 */

if (!defined('ABSPATH')) {
    die('You are not authorized to directly access to this page');
}


//-Admin bar--------------------------------------------------------//

//Remove admin bar since v3.1
add_filter('show_admin_bar', '__return_false');
remove_action('init', 'wp_admin_bar_init');


//-Feeds--------------------------------------------------------//

//Remove automatic feed links since WP v.3.x
remove_theme_support('automatic-feed-links');

//Remove feed links
//<link rel="alternate" type="application/rss+xml" title="__SITE_NAME__ &raquo; Comments Feed" href="__SITE_URL__/comments/feed/" />
remove_action('wp_head', 'feed_links', 2);

//Remove extra feed links, such as categories, tags, etc.
//<link rel="alternate" type="application/rss+xml" title="__SITE_NAME__ &raquo; Comments Feed" href="__SITE_URL__/category/__CAT__/feed/" />
remove_action('wp_head', 'feed_links_extra', 3);


//-Generator--------------------------------------------------------//

//Remove WORDPRESS version.
//<meta name="generator" content="WordPress __WP_VERSION__" />
remove_action('wp_head', 'wp_generator');

/**
 * Remove WORDPRESS generator info.
 *
 * @since Clean WordPress 1.1.0
 */
add_filter('the_generator', '_cw_remove_version');
function _cw_remove_version()
{
    return '';
}


//-Links--------------------------------------------------------//

//Link to adjacent posts.
//<link rel="prev" title="adjacent_posts_rel_link" href="__SITE_URL__" />
remove_action('wp_head', 'adjacent_posts_rel_link_wp_head', 10, 0);

//Link to blog index.
//<link rel="index" title="__SITE_NAME__" href="__SITE_URL__" />
remove_action('wp_head', 'index_rel_link');

//Really Simple Discovery support.
//<link rel="EditURI" type="application/rsd+xml" title="RSD" href="__SITE_URL__" />
remove_action('wp_head', 'rsd_link');

//Remove Shortlink Link Rel Hook
remove_action('wp_head', 'wp_shortlink_wp_head', 10, 0);

//Windows Live Writter support.
//<link rel="wlwmanifest" type="application/wlwmanifest+xml" href="__SITE_URL__" />
remove_action('wp_head', 'wlwmanifest_link');

//Others
remove_action('wp_head', 'parent_post_rel_link', 10, 0);
remove_action('wp_head', 'start_post_rel_link', 10, 0);


//-i18n--------------------------------------------------------//

//Remove i18n styles
remove_action('wp_head', 'wp_dlmp_l10n_style');


//-Frontend hooks--------------------------------------------------------//

/**
 * Remove unecessary details in body_class.
 *
 * @param string $classes Default classes for `body_class()`
 * @param string $class Other classes for `body_class()`
 * @uses get_query_var() Get a special value from query.
 * @uses get_user_by() Get user data for an unknown user.
 * @uses get_userdata() Get user data for a known user.
 * @uses is_author() To know if current page is an author's page.
 * @uses sanitize_html_class() 
 * @uses get_queried_object() 
 * @uses get_queried_object_id() 
 *
 * @since Clean WordPress 1.3.1
 */
add_filter('body_class', '_cw_clean_body_class', 10, 2);
function _cw_clean_body_class($classes, $class)
{
    //Remove unecessary CSS classes generated by WORDPRESS on authors pages
    if (isset($classes['author'])) {
        //Get author
        if (!$name = get_query_var('author_name')) {
            $author = get_userdata(get_query_var('author'));
        }
        else {
            $author = get_user_by('slug', $name);
        }

        //Get data to remove
        $removed[] = 'author-'.$author->ID;
        $removed[] = 'author-'.$author->user_nicename;

        //Remove classes
        $classes = array_diff($classes, $removed);
    }

    //Remove unecessary CSS classes generated by WORDPRESS on single pages
    if (isset($classes['single'])) {
        //Get post details
        $post = get_queried_object();
        $pid = get_queried_object_id();

        //Check post type
        if (isset($post->post_type)) {
            $removed[] = 'single-'.sanitize_html_class($post->post_type, $pid);
            $removed[] = 'postid-'.$pid;

            //Remove classes
            $classes = array_diff($classes, $removed);
        }
    }

    //Remove unecessary CSS classes generated by WORDPRESS on categories / tags / tax
    if (isset($classes['category']) || isset($classes['tag']) || isset($classes['tax'])) {
        //Get object details
        $obj = get_queried_object();

        //Check object ID
        if (isset($obj->term_id)) {
            //Get class
            $obj_class = sanitize_html_class($obj->slug, $obj->term_id);
            $obj_class = is_numeric($obj_class) || !trim($obj_class, '-') ? 
                $obj->term_id : 
                $obj_class;

            //Remove details
            if (isset($classes['category'])) {
                $removed[] = 'category-'.$obj_class;
                $removed[] = 'category-'.$obj->term_id;
            }
            else if (isset($classes['tag'])) {
                $removed[] = 'tag-'.$obj_class;
                $removed[] = 'tag-'.$obj->term_id;
            }
            else if (isset($classes['tax'])) {
                $removed[] = 'tax-'.sanitize_html_class($obj->taxonomy);
                $removed[] = 'term-'.$obj_class;
                $removed[] = 'term-'.$obj->term_id;
            }

            //Remove classes
            $classes = array_diff($classes, $removed);
        }
    }

    //Return all classes
    return array_merge($classes, (array)$class);
}


/**
 * Delete Wordpress auto-formatting.
 *
 * @uses wptexturize()
 * @uses wpautop() To format content
 *
 * @since Clean WordPress 1.3.1
 */
remove_filter('the_content', 'wpautop');
remove_filter('the_content', 'wptexturize');
add_filter('the_content', '_cw_shortcode_formatter', 99);
function _cw_shortcode_formatter($content)
{
    $new_content = '';
    $pattern_full = '{(\[raw\].*?\[/raw\])}is';
    $pattern_contents = '{\[raw\](.*?)\[/raw\]}is';
    $pieces = preg_split($pattern_full, $content, -1, PREG_SPLIT_DELIM_CAPTURE);

    //Make the magic
    foreach ($pieces as $piece) {
        if (preg_match($pattern_contents, $piece, $matches)) {
            $new_content .= $matches[1];
        } else {
            $new_content .= wptexturize(wpautop($piece));
        }
    }

    return $new_content;
}


/**
 * Disable emojicons introduced with WP 4.2 in frontend panel.
 *
 * @uses remove_action()
 * @uses add_filter()
 *
 * @since Clean WordPress 1.3.2
 */
add_action('init', '_cw_disable_wp_emojicons');
function _cw_disable_wp_emojicons()
{
    //All actions related to emojis
    remove_action('wp_head', 'print_emoji_detection_script', 7);
    remove_action('wp_print_styles', 'print_emoji_styles');
    remove_filter('wp_mail', 'wp_staticize_emoji_for_email');
    remove_filter('the_content_feed', 'wp_staticize_emoji');
    remove_filter('comment_text_rss', 'wp_staticize_emoji');
}


/**
 * Minify HTML code.
 *
 * @uses remove_action()
 * @uses add_filter()
 *
 * @since Clean WordPress 1.3.6
 */
add_action('get_header', 'start_ob');
function start_ob()
{
    ob_start('minify_html');
}
function minify_html($output)
{
    $minify = new HTMLMinify($output, array('optimizationLevel' => HTMLMinify::OPTIMIZATION_ADVANCED));
    return $minify->process();
}