hide certain posts from search

gistfile1.aw

if ( function_exists( 'wpcom_is_vip' ) && wpcom_is_vip() ) {
	wpcom_vip_load_helper_wpcom();

} else {
	require_once( WP_CONTENT_DIR . '/themes/vip/plugins/vip-do-not-include-on-wpcom/vip-local-development-helper/vip-local-development-helper.php' );
	require_once( WP_CONTENT_DIR . '/themes/vip/plugins/vip-do-not-include-on-wpcom/vip-powered-wpcom/vip-powered-wpcom.php' );
}
wpcom_vip_load_helper();

wpcom_vip_load_plugin( 'easy-custom-fields' );

/**
 * Setup a custom field for posts we want to hide
 */

if ( !class_exists( "Easy_CF_Field_YesNo" ) && class_exists( "Easy_CF_Field" ) ) {
	class Easy_CF_Field_YesNo extends Easy_CF_Field {
		public function print_form( $object='', $box='' ) {
			$class = ( empty( $this->_field_data['class'] ) ) ? $this->_field_data['id'] . '_class' : $this->_field_data['class'];
			$input_class = ( empty( $this->_field_data['input_class'] ) ) ? $this->_field_data['id'] . '_input_class' : $this->_field_data['input_class'];
	
			$id = ( empty( $this->_field_data['id'] ) ) ? $this->_field_data['id'] : $this->_field_data['id'];
			$label = ( empty( $this->_field_data['label'] ) ) ? $this->_field_data['id'] : $this->_field_data['label'];
			$value = $this->get();

			$hint = ( empty( $this->_field_data['hint'] ) ) ? '' : '<p><em>' . $this->_field_data['hint'] . '</em></p>';
			
			$select = $this->get();
			
			if ( !empty($select) ) 
				$selected_terms[] = $select;
				
			if ( !isset( $selected_terms ) && isset( $this->_field_data['args']['default'] ) ) 
				$selected_terms[] = $this->_field_data['args']['default'];
				
			$terms = array( 'yes' => 'yes', 'no' => 'no' );
			$values = '';
			foreach( $terms as $term_id => $term ) {
				$selected = '';
				if ( in_array( $term_id, $selected_terms ) )
					$selected = 'selected="selected" ';
				$values .= '<option ' . $selected . 'value="' . $term_id . '">' . $term . '</option>' . "\n";
			}

			$label_format =
				'<div class="%s">'.
				'<p><label for="%s"><strong>%s</strong></label></p>'.
				'<p><select class="%s" style="width: 100%%;" name="%s">'.
				'%s'.
				'</select></p>'.
				'%s'.
				'</div>';
			printf( $label_format, $class, $id, $label, $input_class, $id, $values, $hint );
		}
	}
}

$field_data = array (
	'hide_posts' => array (
		'fields' => array(
			'hide_post_search'	=> array( 'label' => 'Hide from search', 'hint' => 'Hide this post from search results', 'type' => 'YesNo' ),
		),
		'title' => 'Post visibility',
		'context' => 'advanced',
		'pages' => array( 'post' ),
	),
);
$easy_cf = new Easy_CF( $field_data );

function get_hidden_posts_search( $force_refresh = false ) {
	$posts_to_hide_on_search = get_transient( 'posts_to_hide_on_search' );
	if ( false === $posts_to_hide_on_search || true === $force_refresh ) {
		$posts_to_hide_on_search = array();
		$matches = get_posts( array( 'meta_key' => 'hide_post_search', 'meta_value' => 'yes', 'post_type' => 'post' ) );
		if ( !is_wp_error( $matches ) && !empty( $matches ) ) {
			foreach( $matches as $post )
				$posts_to_hide_on_search[] = $post->ID;
		}
		set_transient( 'posts_to_hide_on_search', $posts_to_hide_on_search );
	}
	return $posts_to_hide_on_search;
}

add_filter( 'parse_query', 'skip_hidden_posts_search' );
function skip_hidden_posts_search( $request ) {
	if ( true === $request->is_search ) {
		$posts_to_hide_on_search = get_hidden_posts_search();
		if ( is_array( $posts_to_hide_on_search ) && !empty( $posts_to_hide_on_search ) )
			$request->query_vars['post__not_in'] = $posts_to_hide_on_search;
	}
	
	return $request;
}

add_action( 'save_post', 'refresh_posts_to_hide_on_search' );
function refresh_posts_to_hide_on_search() {
	get_hidden_posts_search( $force_refresh = true );
}