// Disable character filtering, like single quotes becoming curly quotes.
// Titles
remove_filter( 'the_title',    'wptexturize' );
// Content (the body)
remove_filter( 'the_content',  'wptexturize' );
// Excerpts
remove_filter( 'the_excerpt',  'wptexturize' );
// Comments
remove_filter( 'comment_text', 'wptexturize' );

// Redirect if a case-insensitive search matches.

add_action('template_redirect', 'redirect_single_post');
function redirect_single_post() {
    if (is_search()) {
        global $wp_query;
        if ($wp_query->post_count == 1 && $wp_query->max_num_pages == 1) {
            wp_redirect( get_permalink( $wp_query->posts['0']->ID ) );
            exit;
        }
    }
}



/*   Old code which didn't work.
// This is like Wikipedia's "Go".
// With thanks to s_ha_dum:
//   https://wordpress.stackexchange.com/questions/49208/want-to-redirect-if-search-query-match-exact-title-of-any-post#73061

//TODO  - Redirect if only one match was found.
//FIXME - This does not work for multiple words.  I need to be far more sneaky.

function redir_title_match() {
  if (is_search()) {
    global $wp_query,$wpdb;
    $s_str = $wp_query->query_vars['s'];
    $m = $wpdb->get_var($wpdb->prepare("SELECT ID FROM {$wpdb->posts} WHERE post_title = %s", strtolower($s_str)));
    if (!empty($m)) {
      wp_safe_redirect(get_permalink($m));
      exit();
    }
  }
}
add_filter('pre_get_posts','redir_title_match');
*/

// remove version info from header and footer
function complete_version_removal() {
  return '';
}
add_filter('the_generator', 'complete_version_removal');

// delay feed update
function publish_later_on_feed($where) {
  global $wpdb;

  if (is_feed()) {
    // timestamp in WP-format
    $now = gmdate('Y-m-d H:i:s');

    // value for wait; + device
    $wait = '15'; // integer, minutes

    // https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html#function_timestampdiff  [  ]
    $device = 'MINUTE'; // MINUTE, HOUR, DAY, WEEK, MONTH, YEAR

    // add SQL-sytax to default $where
    $where .= " AND TIMESTAMPDIFF($device, $wpdb->posts.post_date_gmt, '$now') > $wait ";
  }
  return $where;
}
add_filter('posts_where', 'publish_later_on_feed');

// escape html entities in comments
function encode_code_in_comment($source) {
  $encoded = preg_replace_callback('/<code>(.*?)<\/code>/ims',
  create_function('$matches', '$matches[1] = preg_replace(array("/^[\r|\n]+/i", "/[\r|\n]+$/i"), "", $matches[1]); 
  return "<code>" . htmlentities($matches[1]) . "</"."code>";'), $source);
  if ($encoded)
    return $encoded;
  else
    return $source;
}
add_filter('pre_comment_content', 'encode_code_in_comment');

// Remove fontawesome
//   https://fontawesome.com/
add_action( 'wp_print_styles', 'tn_dequeue_font_awesome_style' );
function tn_dequeue_font_awesome_style() {
      wp_dequeue_style( 'fontawesome' );
      wp_deregister_style( 'fontawesome' );
}