<?php
if ( ! class_exists( 'Featured_Content' ) && isset( $GLOBALS['pagenow'] ) && 'plugins.php' !== $GLOBALS['pagenow'] ) {
/**
* Featured Content.
*
* This module will allow users to define a subset of posts to be displayed in a
* theme-designated featured content area.
*
* This feature will only be activated for themes that declare that they support
* it. This can be done by adding code similar to the following during the
* "after_setup_theme" action:
*
* add_theme_support( 'featured-content', array(
* 'filter' => 'mytheme_get_featured_content',
* 'max_posts' => 20,
* 'post_types' => array( 'post', 'page' ),
* ) );
*
* For maximum compatibility with different methods of posting users will
* designate a featured post tag to associate posts with. Since this tag now has
* special meaning beyond that of a normal tags, users will have the ability to
* hide it from the front-end of their site.
*/
class Featured_Content {
/**
* The maximum number of posts that a Featured Content area can contain. We
* define a default value here but themes can override this by defining a
* "max_posts" entry in the second parameter passed in the call to
* add_theme_support( 'featured-content' ).
*
* @see Featured_Content::init()
*/
public static $max_posts = 15;
/**
* The registered post types supported by Featured Content. Themes can add
* Featured Content support for registered post types by defining a
* 'post_types' argument (string|array) in the call to
* add_theme_support( 'featured-content' ).
*
* @see Featured_Content::init()
*/
public static $post_types = array( 'post' );
/**
* Instantiate.
*
* All custom functionality will be hooked into the "init" action.
*/
public static function setup() {
add_action( 'init', array( __CLASS__, 'init' ), 30 );
}
/**
* Conditionally hook into WordPress.
*
* Themes must declare that they support this module by adding
* add_theme_support( 'featured-content' ); during after_setup_theme.
*
* If no theme support is found there is no need to hook into WordPress. We'll
* just return early instead.
*
* @uses Featured_Content::$max_posts
*/
public static function init() {
$theme_support = get_theme_support( 'featured-content' );
// Return early if theme does not support featured content.
if ( ! $theme_support ) {
return;
}
/*
* An array of named arguments must be passed as the second parameter
* of add_theme_support().
*/
if ( ! isset( $theme_support[0] ) ) {
return;
}
if ( isset( $theme_support[0]['featured_content_filter'] ) ) {
$theme_support[0]['filter'] = $theme_support[0]['featured_content_filter'];
unset( $theme_support[0]['featured_content_filter'] );
}
// Return early if "filter" has not been defined.
if ( ! isset( $theme_support[0]['filter'] ) ) {
return;
}
// Theme can override the number of max posts.
if ( isset( $theme_support[0]['max_posts'] ) ) {
self::$max_posts = absint( $theme_support[0]['max_posts'] );
}
add_filter( $theme_support[0]['filter'], array( __CLASS__, 'get_featured_posts' ) );
add_action( 'customize_register', array( __CLASS__, 'customize_register' ), 9 );
add_action( 'admin_init', array( __CLASS__, 'register_setting' ) );
add_action( 'save_post', array( __CLASS__, 'delete_transient' ) );
add_action( 'delete_post_tag', array( __CLASS__, 'delete_post_tag' ) );
add_action( 'customize_controls_enqueue_scripts', array( __CLASS__, 'enqueue_scripts' ) );
add_action( 'pre_get_posts', array( __CLASS__, 'pre_get_posts' ) );
add_action( 'switch_theme', array( __CLASS__, 'switch_theme' ) );
add_action( 'switch_theme', array( __CLASS__, 'delete_transient' ) );
add_action( 'wp_loaded', array( __CLASS__, 'wp_loaded' ) );
add_action( 'split_shared_term', array( __CLASS__, 'jetpack_update_featured_content_for_split_terms', 10, 4 ) );
if ( isset( $theme_support[0]['additional_post_types'] ) ) {
$theme_support[0]['post_types'] = array_merge( array( 'post' ), (array) $theme_support[0]['additional_post_types'] );
unset( $theme_support[0]['additional_post_types'] );
}
// Themes can allow Featured Content pages
if ( isset( $theme_support[0]['post_types'] ) ) {
self::$post_types = array_merge( self::$post_types, (array) $theme_support[0]['post_types'] );
// register post_tag support for each post type
foreach ( self::$post_types as $post_type ) {
register_taxonomy_for_object_type( 'post_tag', $post_type );
}
}
}
/**
* Hide "featured" tag from the front-end.
*
* Has to run on wp_loaded so that the preview filters of the customizer
* have a chance to alter the value.
*/
public static function wp_loaded() {
if ( self::get_setting( 'hide-tag' ) ) {
add_filter( 'get_terms', array( __CLASS__, 'hide_featured_term' ), 10, 3 );
add_filter( 'get_the_terms', array( __CLASS__, 'hide_the_featured_term' ), 10, 3 );
}
}
/**
* Get featured posts
*
* This method is not intended to be called directly. Theme developers should
* place a filter directly in their theme and then pass its name as a value of
* the "filter" key in the array passed as the $args parameter during the call
* to: add_theme_support( 'featured-content', $args ).
*
* @uses Featured_Content::get_featured_post_ids()
*
* @return array
*/
public static function get_featured_posts() {
$post_ids = self::get_featured_post_ids();
// No need to query if there is are no featured posts.
if ( empty( $post_ids ) ) {
return array();
}
$featured_posts = get_posts( array(
'include' => $post_ids,
'posts_per_page' => count( $post_ids ),
'post_type' => self::$post_types,
) );
return $featured_posts;
}
/**
* Get featured post IDs
*
* This function will return the an array containing the post IDs of all
* featured posts.
*
* Sets the "featured_content_ids" transient.
*
* @return array Array of post IDs.
*/
public static function get_featured_post_ids() {
// Return array of cached results if they exist.
$featured_ids = get_transient( 'featured_content_ids' );
if ( ! empty( $featured_ids ) ) {
return array_map(
'absint',
/**
* Filter the list of Featured Posts IDs.
*
* @module theme-tools
*
* @since 2.7.0
*
* @param array $featured_ids Array of post IDs.
*/
apply_filters( 'featured_content_post_ids', (array) $featured_ids )
);
}
$settings = self::get_setting();
// Return empty array if no tag name is set.
$term = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
if ( ! $term ) {
$term = get_term_by( 'id', $settings['tag-id'], 'post_tag' );
}
if ( $term ) {
$tag = $term->term_id;
} else {
/** This action is documented in modules/theme-tools/featured-content.php */
return apply_filters( 'featured_content_post_ids', array() );
}
// Back compat for installs that have the quantity option still set.
$quantity = isset( $settings['quantity'] ) ? $settings['quantity'] : self::$max_posts;
// Query for featured posts.
$featured = get_posts( array(
'numberposts' => $quantity,
'post_type' => self::$post_types,
'tax_query' => array(
array(
'field' => 'term_id',
'taxonomy' => 'post_tag',
'terms' => $tag,
),
),
) );
// Return empty array if no featured content exists.
if ( ! $featured ) {
/** This action is documented in modules/theme-tools/featured-content.php */
return apply_filters( 'featured_content_post_ids', array() );
}
// Ensure correct format before save/return.
$featured_ids = wp_list_pluck( (array) $featured, 'ID' );
$featured_ids = array_map( 'absint', $featured_ids );
set_transient( 'featured_content_ids', $featured_ids );
/** This action is documented in modules/theme-tools/featured-content.php */
return apply_filters( 'featured_content_post_ids', $featured_ids );
}
/**
* Delete Transient.
*
* Hooks in the "save_post" action.
* @see Featured_Content::validate_settings().
*/
public static function delete_transient() {
delete_transient( 'featured_content_ids' );
}
/**
* Exclude featured posts from the blog query when the blog is the front-page,
* and user has not checked the "Display tag content in all listings" checkbox.
*
* Filter the home page posts, and remove any featured post ID's from it.
* Hooked onto the 'pre_get_posts' action, this changes the parameters of the
* query before it gets any posts.
*
* @uses Featured_Content::get_featured_post_ids();
* @uses Featured_Content::get_setting();
* @param WP_Query $query
* @return WP_Query Possibly modified WP_Query
*/
public static function pre_get_posts( $query ) {
// Bail if not home or not main query.
if ( ! $query->is_home() || ! $query->is_main_query() ) {
return;
}
// Bail if the blog page is not the front page.
if ( 'posts' !== get_option( 'show_on_front' ) ) {
return;
}
$featured = self::get_featured_post_ids();
// Bail if no featured posts.
if ( ! $featured ) {
return;
}
$settings = self::get_setting();
// Bail if the user wants featured posts always displayed.
if ( true == $settings['show-all'] ) {
return;
}
// We need to respect post ids already in the blacklist.
$post__not_in = $query->get( 'post__not_in' );
if ( ! empty( $post__not_in ) ) {
$featured = array_merge( (array) $post__not_in, $featured );
$featured = array_unique( $featured );
}
$query->set( 'post__not_in', $featured );
}
/**
* Reset tag option when the saved tag is deleted.
*
* It's important to mention that the transient needs to be deleted, too.
* While it may not be obvious by looking at the function alone, the transient
* is deleted by Featured_Content::validate_settings().
*
* Hooks in the "delete_post_tag" action.
* @see Featured_Content::validate_settings().
*
* @param int $tag_id The term_id of the tag that has been deleted.
* @return void
*/
public static function delete_post_tag( $tag_id ) {
$settings = self::get_setting();
if ( empty( $settings['tag-id'] ) || $tag_id != $settings['tag-id'] ) {
return;
}
$settings['tag-id'] = 0;
$settings = self::validate_settings( $settings );
update_option( 'featured-content', $settings );
}
/**
* Hide featured tag from displaying when global terms are queried from
* the front-end.
*
* Hooks into the "get_terms" filter.
*
* @uses Featured_Content::get_setting()
*
* @param array $terms A list of term objects. This is the return value of get_terms().
* @param array $taxonomies An array of taxonomy slugs.
* @return array $terms
*/
public static function hide_featured_term( $terms, $taxonomies, $args ) {
// This filter is only appropriate on the front-end.
if ( is_admin() ) {
return $terms;
}
// We only want to hide the featured tag.
if ( ! in_array( 'post_tag', $taxonomies ) ) {
return $terms;
}
// Bail if no terms were returned.
if ( empty( $terms ) ) {
return $terms;
}
// Bail if term objects are unavailable.
if ( 'all' != $args['fields'] ) {
return $terms;
}
$settings = self::get_setting();
$tag = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
if ( false !== $tag ) {
foreach ( $terms as $order => $term ) {
if ( is_object( $term ) && ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) ) {
unset( $terms[ $order ] );
}
}
}
return $terms;
}
/**
* Hide featured tag from displaying when terms associated with a post object
* are queried from the front-end.
*
* Hooks into the "get_the_terms" filter.
*
* @uses Featured_Content::get_setting()
*
* @param array $terms A list of term objects. This is the return value of get_the_terms().
* @param int $id The ID field for the post object that terms are associated with.
* @param array $taxonomy An array of taxonomy slugs.
* @return array $terms
*/
public static function hide_the_featured_term( $terms, $id, $taxonomy ) {
// This filter is only appropriate on the front-end.
if ( is_admin() ) {
return $terms;
}
// Make sure we are in the correct taxonomy.
if ( 'post_tag' != $taxonomy ) {
return $terms;
}
// No terms? Return early!
if ( empty( $terms ) ) {
return $terms;
}
$settings = self::get_setting();
$tag = get_term_by( 'name', $settings['tag-name'], 'post_tag' );
if ( false !== $tag ) {
foreach ( $terms as $order => $term ) {
if ( $settings['tag-id'] === $term->term_id || $settings['tag-name'] === $term->name ) {
unset( $terms[ $order ] );
}
}
}
return $terms;
}
/**
* Register custom setting on the Settings -> Reading screen.
*
* @uses Featured_Content::render_form()
* @uses Featured_Content::validate_settings()
*
* @return void
*/
public static function register_setting() {
add_settings_field( 'featured-content', __( 'Featured Content', 'jetpack' ), array( __class__, 'render_form' ), 'reading' );
// Register sanitization callback for the Customizer.
register_setting( 'featured-content', 'featured-content', array( __class__, 'validate_settings' ) );
}
/**
* Add settings to the Customizer.
*
* @param WP_Customize_Manager $wp_customize Theme Customizer object.
*/
public static function customize_register( $wp_customize ) {
$wp_customize->add_section( 'featured_content', array(
'title' => __( 'Featured Content', 'jetpack' ),
'description' => sprintf( __( 'Easily feature all posts with the <a href="%1$s">"featured" tag</a> or a tag of your choice. Your theme supports up to %2$s posts in its featured content area.', 'jetpack' ), admin_url( '/edit.php?tag=featured' ), absint( self::$max_posts ) ),
'priority' => 130,
'theme_supports' => 'featured-content',
) );
/* Add Featured Content settings.
*
* Sanitization callback registered in Featured_Content::validate_settings().
* See http://themeshaper.com/2013/04/29/validation-sanitization-in-customizer/comment-page-1/#comment-12374
*/
$wp_customize->add_setting( 'featured-content[tag-name]', array(
'type' => 'option',
'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
) );
$wp_customize->add_setting( 'featured-content[hide-tag]', array(
'default' => true,
'type' => 'option',
'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
) );
$wp_customize->add_setting( 'featured-content[show-all]', array(
'default' => false,
'type' => 'option',
'sanitize_js_callback' => array( __CLASS__, 'delete_transient' ),
) );
// Add Featured Content controls.
$wp_customize->add_control( 'featured-content[tag-name]', array(
'label' => __( 'Tag name', 'jetpack' ),
'section' => 'featured_content',
'theme_supports' => 'featured-content',
'priority' => 20,
) );
$wp_customize->add_control( 'featured-content[hide-tag]', array(
'label' => __( 'Hide tag from displaying in post meta and tag clouds.', 'jetpack' ),
'section' => 'featured_content',
'theme_supports' => 'featured-content',
'type' => 'checkbox',
'priority' => 30,
) );
$wp_customize->add_control( 'featured-content[show-all]', array(
'label' => __( 'Display tag content in all listings.', 'jetpack' ),
'section' => 'featured_content',
'theme_supports' => 'featured-content',
'type' => 'checkbox',
'priority' => 40,
) );
}
/**
* Enqueue the tag suggestion script.
*/
public static function enqueue_scripts() {
wp_enqueue_script( 'featured-content-suggest', plugins_url( 'js/suggest.js', __FILE__ ), array( 'suggest' ), '20131022', true );
}
/**
* Renders all form fields on the Settings -> Reading screen.
*/
public static function render_form() {
printf( __( 'The settings for Featured Content have <a href="%s">moved to Appearance → Customize</a>.', 'jetpack' ), admin_url( 'customize.php?#accordion-section-featured_content' ) );
}
/**
* Get settings
*
* Get all settings recognized by this module. This function will return all
* settings whether or not they have been stored in the database yet. This
* ensures that all keys are available at all times.
*
* In the event that you only require one setting, you may pass its name as the
* first parameter to the function and only that value will be returned.
*
* @param string $key The key of a recognized setting.
* @return mixed Array of all settings by default. A single value if passed as first parameter.
*/
public static function get_setting( $key = 'all' ) {
$saved = (array) get_option( 'featured-content' );
/**
* Filter Featured Content's default settings.
*
* @module theme-tools
*
* @since 2.7.0
*
* @param array $args {
* Array of Featured Content Settings
*
* @type int hide-tag Default is 1.
* @type int tag-id Default is 0.
* @type string tag-name Default is empty.
* @type int show-all Default is 0.
* }
*/
$defaults = apply_filters( 'featured_content_default_settings', array(
'hide-tag' => 1,
'tag-id' => 0,
'tag-name' => '',
'show-all' => 0,
) );
$options = wp_parse_args( $saved, $defaults );
$options = array_intersect_key( $options, $defaults );
if ( 'all' != $key ) {
return isset( $options[ $key ] ) ? $options[ $key ] : false;
}
return $options;
}
/**
* Validate settings
*
* Make sure that all user supplied content is in an expected format before
* saving to the database. This function will also delete the transient set in
* Featured_Content::get_featured_content().
*
* @uses Featured_Content::delete_transient()
*
* @param array $input
* @return array $output
*/
public static function validate_settings( $input ) {
$output = array();
if ( empty( $input['tag-name'] ) ) {
$output['tag-id'] = 0;
} else {
$term = get_term_by( 'name', $input['tag-name'], 'post_tag' );
if ( $term ) {
$output['tag-id'] = $term->term_id;
} else {
$new_tag = wp_create_tag( $input['tag-name'] );
if ( ! is_wp_error( $new_tag ) && isset( $new_tag['term_id'] ) ) {
$output['tag-id'] = $new_tag['term_id'];
}
}
$output['tag-name'] = $input['tag-name'];
}
$output['hide-tag'] = isset( $input['hide-tag'] ) && $input['hide-tag'] ? 1 : 0;
$output['show-all'] = isset( $input['show-all'] ) && $input['show-all'] ? 1 : 0;
self::delete_transient();
return $output;
}
/**
* Removes the quantity setting from the options array.
*
* @return void
*/
public static function switch_theme() {
$option = (array) get_option( 'featured-content' );
if ( isset( $option['quantity'] ) ) {
unset( $option['quantity'] );
update_option( 'featured-content', $option );
}
}
public static function jetpack_update_featured_content_for_split_terms( $old_term_id, $new_term_id, $term_taxonomy_id, $taxonomy ) {
$featured_content_settings = get_option( 'featured-content', array() );
// Check to see whether the stored tag ID is the one that's just been split.
if ( isset( $featured_content_settings['tag-id'] ) && $old_term_id == $featured_content_settings['tag-id'] && 'post_tag' == $taxonomy ) {
// We have a match, so we swap out the old tag ID for the new one and resave the option.
$featured_content_settings['tag-id'] = $new_term_id;
update_option( 'featured-content', $featured_content_settings );
}
}
}
Featured_Content::setup();
} // end if ( ! class_exists( 'Featured_Content' ) && isset( $GLOBALS['pagenow'] ) && 'plugins.php' !== $GLOBALS['pagenow'] ) {