maybe_upgrade();
load_plugin_textdomain( 'page-links-to', false, basename( dirname( __FILE__ ) ) . '/languages' );
add_filter( 'wp_list_pages', array( $this, 'wp_list_pages' ) );
add_action( 'template_redirect', array( $this, 'template_redirect' ) );
add_filter( 'page_link', array( $this, 'link' ), 20, 2 );
add_filter( 'post_link', array( $this, 'link' ), 20, 2 );
add_filter( 'post_type_link', array( $this, 'link', ), 20, 2 );
add_action( 'do_meta_boxes', array( $this, 'do_meta_boxes' ), 20, 2 );
add_action( 'save_post', array( $this, 'save_post' ) );
add_filter( 'wp_nav_menu_objects', array( $this, 'wp_nav_menu_objects' ), 10, 2 );
add_action( 'load-post.php', array( $this, 'load_post' ) );
add_filter( 'the_posts', array( $this, 'the_posts' ) );
}
/**
* Performs an upgrade for older versions. Hides the keys so they only show in the plugin's UI
*/
function maybe_upgrade() {
if ( get_option( 'txfx_plt_schema_version' ) < 3 ) {
global $wpdb;
$wpdb->query( "UPDATE $wpdb->postmeta SET meta_key = '_links_to' WHERE meta_key = 'links_to' " );
$wpdb->query( "UPDATE $wpdb->postmeta SET meta_key = '_links_to_target' WHERE meta_key = 'links_to_target' " );
$wpdb->query( "UPDATE $wpdb->postmeta SET meta_key = '_links_to_type' WHERE meta_key = 'links_to_type' " );
wp_cache_flush();
update_option( 'txfx_plt_schema_version', 3 );
}
}
/**
* Returns post ids and meta values that have a given key
* @param string $key post meta key
* @return array an array of objects with post_id and meta_value properties
*/
function meta_by_key( $key ) {
global $wpdb;
return $wpdb->get_results( $wpdb->prepare( "SELECT post_id, meta_value FROM $wpdb->postmeta WHERE meta_key = %s", $key ) );
}
/**
* Returns all links for the current site
* @return array an array of links, keyed by post ID
*/
function get_links() {
global $wpdb, $blog_id;
if ( !isset( $this->links[$blog_id] ) )
$links_to = $this->meta_by_key( '_links_to' );
else
return $this->links[$blog_id];
if ( !$links_to ) {
$this->links[$blog_id] = false;
return false;
}
foreach ( (array) $links_to as $link )
$this->links[$blog_id][$link->post_id] = $link->meta_value;
return $this->links[$blog_id];
}
/**
* Returns all targets for the current site
* @return array an array of targets, keyed by post ID
*/
function get_targets () {
global $wpdb, $page_links_to_target_cache, $blog_id;
if ( !isset( $this->targets[$blog_id] ) )
$links_to = $this->meta_by_key( '_links_to_target' );
else
return $this->targets[$blog_id];
if ( !$links_to ) {
$this->targets[$blog_id] = false;
return false;
}
foreach ( (array) $links_to as $link )
$this->targets[$blog_id][$link->post_id] = $link->meta_value;
return $this->targets[$blog_id];
}
/**
* Adds the meta box to the post or page edit screen
* @param string $page the name of the current page
* @param string $context the current context
*/
function do_meta_boxes( $page, $context ) {
// Plugins that use custom post types can use this filter to hide the PLT UI in their post type.
$plt_post_types = apply_filters( 'page-links-to-post-types', array_keys( get_post_types( array('show_ui' => true ) ) ) );
if ( in_array( $page, $plt_post_types ) && 'advanced' === $context )
add_meta_box( 'page-links-to', 'Page Links To', array( $this, 'meta_box' ), $page, 'advanced', 'low' );
}
function meta_box() {
global $post;
echo '