diff options
Diffstat (limited to 'plugins/jetpack/modules/infinite-scroll/infinity.php')
| -rw-r--r-- | plugins/jetpack/modules/infinite-scroll/infinity.php | 945 |
1 files changed, 945 insertions, 0 deletions
diff --git a/plugins/jetpack/modules/infinite-scroll/infinity.php b/plugins/jetpack/modules/infinite-scroll/infinity.php new file mode 100644 index 00000000..ad57f1b6 --- /dev/null +++ b/plugins/jetpack/modules/infinite-scroll/infinity.php @@ -0,0 +1,945 @@ +<?php + +/* +Plugin Name: The Neverending Home Page. +Plugin URI: http://automattic.com/ +Description: Adds infinite scrolling support to the front-end blog post view for themes, pulling the next set of posts automatically into view when the reader approaches the bottom of the page. +Version: 1.1 +Author: Automattic +Author URI: http://automattic.com/ +License: GNU General Public License v2 or later +License URI: http://www.gnu.org/licenses/gpl-2.0.html +*/ + +/** + * Class: The_Neverending_Home_Page relies on add_theme_support, expects specific + * styling from each theme; including fixed footer. + */ +class The_Neverending_Home_Page { + /** + * + */ + function __construct() { + add_filter( 'pre_get_posts', array( $this, 'posts_per_page_query' ) ); + + add_action( 'admin_init', array( $this, 'settings_api_init' ) ); + add_action( 'template_redirect', array( $this, 'action_template_redirect' ) ); + add_action( 'template_redirect', array( $this, 'ajax_response' ) ); + add_action( 'custom_ajax_infinite_scroll', array( $this, 'query' ) ); + add_action( 'the_post', array( $this, 'preserve_more_tag' ) ); + add_action( 'get_footer', array( $this, 'footer' ) ); + + // Plugin compatibility + add_filter( 'grunion_contact_form_redirect_url', array( $this, 'filter_grunion_redirect_url' ) ); + + // Parse IS settings from theme + self::get_settings(); + } + + /** + * Initialize our static variables + */ + static $the_time = null; + static $settings = null; // Don't access directly, instead use self::get_settings(). + + static $option_name_enabled = 'infinite_scroll'; + + /** + * Parse IS settings provided by theme + * + * @uses get_theme_support, infinite_scroll_has_footer_widgets, sanitize_title, add_action, get_option, wp_parse_args, is_active_sidebar + * @return object + */ + static function get_settings() { + if ( is_null( self::$settings ) ) { + $css_pattern = '#[^A-Z\d\-_]#i'; + + $settings = $defaults = array( + 'type' => 'scroll', // scroll | click + 'requested_type' => 'scroll', // store the original type for use when logic overrides it + 'footer_widgets' => false, // true | false | sidebar_id | array of sidebar_ids -- last two are checked with is_active_sidebar + 'container' => 'content', // container html id + 'wrapper' => true, // true | false | html class + 'render' => false, // optional function, otherwise the `content` template part will be used + 'footer' => true, // boolean to enable or disable the infinite footer | string to provide an html id to derive footer width from + 'posts_per_page' => false // int | false to set based on IS type + ); + + // Validate settings passed through add_theme_support() + $_settings = get_theme_support( 'infinite-scroll' ); + + if ( is_array( $_settings ) ) { + // Preferred implementation, where theme provides an array of options + if ( isset( $_settings[0] ) && is_array( $_settings[0] ) ) { + foreach ( $_settings[0] as $key => $value ) { + switch ( $key ) { + case 'type' : + if ( in_array( $value, array( 'scroll', 'click' ) ) ) + $settings[ $key ] = $settings['requested_type'] = $value; + + break; + + case 'footer_widgets' : + if ( is_string( $value ) ) + $settings[ $key ] = sanitize_title( $value ); + elseif ( is_array( $value ) ) + $settings[ $key ] = array_map( 'sanitize_title', $value ); + elseif ( is_bool( $value ) ) + $settings[ $key ] = $value; + + break; + + case 'container' : + case 'wrapper' : + if ( 'wrapper' == $key && is_bool( $value ) ) { + $settings[ $key ] = $value; + } + else { + $value = preg_replace( $css_pattern, '', $value ); + + if ( ! empty( $value ) ) + $settings[ $key ] = $value; + } + + break; + + case 'render' : + if ( false !== $value && is_callable( $value ) ) { + $settings[ $key ] = $value; + + add_action( 'infinite_scroll_render', $value ); + } + + break; + + case 'footer' : + if ( is_bool( $value ) ) { + $settings[ $key ] = $value; + } + elseif ( is_string( $value ) ) { + $value = preg_replace( $css_pattern, '', $value ); + + if ( ! empty( $value ) ) + $settings[ $key ] = $value; + } + + break; + + case 'posts_per_page' : + if ( is_numeric( $value ) ) + $settings[ $key ] = (int) $value; + + break; + + default: + continue; + + break; + } + } + } + // Checks below are for backwards compatibility + elseif ( is_string( $_settings[0] ) ) { + // Container to append new posts to + $settings['container'] = preg_replace( $css_pattern, '', $_settings[0] ); + + // Wrap IS elements? + if ( isset( $_settings[1] ) ) + $settings['wrapper'] = (bool) $_settings[1]; + } + } + + // Always ensure all values are present in the final array + $settings = wp_parse_args( $settings, $defaults ); + + // Check if a legacy `infinite_scroll_has_footer_widgets()` function is defined and override the footer_widgets parameter's value. + // Otherwise, if a widget area ID or array of IDs was provided in the footer_widgets parameter, check if any contains any widgets. + // It is safe to use `is_active_sidebar()` before the sidebar is registered as this function doesn't check for a sidebar's existence when determining if it contains any widgets. + if ( function_exists( 'infinite_scroll_has_footer_widgets' ) ) { + $settings['footer_widgets'] = (bool) infinite_scroll_has_footer_widgets(); + } + elseif ( is_array( $settings['footer_widgets'] ) ) { + $sidebar_ids = $settings['footer_widgets']; + $settings['footer_widgets'] = false; + + foreach ( $sidebar_ids as $sidebar_id ) { + if ( is_active_sidebar( $sidebar_id ) ) { + $settings['footer_widgets'] = true; + break; + } + } + + unset( $sidebar_ids ); + unset( $sidebar_id ); + } + elseif ( is_string( $settings['footer_widgets'] ) ) { + $settings['footer_widgets'] = (bool) is_active_sidebar( $settings['footer_widgets'] ); + } + + // For complex logic, let themes filter the `footer_widgets` parameter. + $settings['footer_widgets'] = apply_filters( 'infinite_scroll_has_footer_widgets', $settings['footer_widgets'] ); + + // Finally, after all of the sidebar checks and filtering, ensure that a boolean value is present, otherwise set to default of `false`. + if ( ! is_bool( $settings['footer_widgets'] ) ) + $settings['footer_widgets'] = false; + + // Ensure that IS is enabled and no footer widgets exist if the IS type isn't already "click". + if ( 'click' != $settings['type'] ) { + // Check the setting status + $disabled = '' === get_option( self::$option_name_enabled ) ? true : false; + + // Footer content or Reading option check + if ( $settings['footer_widgets'] || $disabled ) + $settings['type'] = 'click'; + } + + // Backwards compatibility for posts_per_page setting + if ( false === $settings['posts_per_page'] ) + $settings['posts_per_page'] = 'click' == $settings['type'] ? (int) get_option( 'posts_per_page' ) : 7; + + // Store final settings in a class static to avoid reparsing + self::$settings = apply_filters( 'infinite_scroll_settings', $settings ); + } + + return (object) self::$settings; + } + + /** + * Has infinite scroll been triggered? + */ + static function got_infinity() { + return isset( $_GET[ 'infinity' ] ); + } + + /** + * The more tag will be ignored by default if the blog page isn't our homepage. + * Let's force the $more global to false. + */ + function preserve_more_tag( $array ) { + global $more; + + if ( self::got_infinity() ) + $more = 0; //0 = show content up to the more tag. Add more link. + + return $array; + } + + /** + * Add a checkbox field to Settings > Reading + * for enabling infinite scroll. + * + * Only show if the current theme supports infinity. + * + * @uses current_theme_supports, add_settings_field, __, register_setting + * @action admin_init + * @return null + */ + function settings_api_init() { + if ( ! current_theme_supports( 'infinite-scroll' ) ) + return; + + // Add the setting field [infinite_scroll] and place it in Settings > Reading + add_settings_field( self::$option_name_enabled, '<span id="infinite-scroll-options">' . __( 'To infinity and beyond', 'jetpack' ) . '</span>', array( $this, 'infinite_setting_html' ), 'reading' ); + register_setting( 'reading', self::$option_name_enabled, 'esc_attr' ); + } + + /** + * HTML code to display a checkbox true/false option + * for the infinite_scroll setting. + */ + function infinite_setting_html() { + $notice = '<em>' . __( "We've disabled this option for you since you have footer widgets in Appearance → Widgets, or because your theme does not support infinite scroll.", 'jetpack' ) . '</em>'; + + // If the blog has footer widgets, show a notice instead of the checkbox + if ( self::get_settings()->footer_widgets || 'click' == self::get_settings()->requested_type ) { + echo '<label>' . $notice . '</label>'; + } else { + echo '<label><input name="infinite_scroll" type="checkbox" value="1" ' . checked( 1, '' !== get_option( self::$option_name_enabled ), false ) . ' /> ' . __( 'Scroll Infinitely', 'jetpack' ) . '</br><small>' . sprintf( __( '(Shows %s posts on each load)', 'jetpack' ), number_format_i18n( self::get_settings()->posts_per_page ) ) . '</small>' . '</label>'; + } + } + + /** + * Does the legwork to determine whether the feature is enabled. + * + * @uses current_theme_supports, self::archive_supports_infinity, self::get_settings, self::set_last_post_time, add_filter, wp_enqueue_script, plugins_url, wp_enqueue_style, add_action + * @action template_redirect + * @return null + */ + function action_template_redirect() { + // Check that we support infinite scroll, and are on the home page. + if ( ! current_theme_supports( 'infinite-scroll' ) || ! self::archive_supports_infinity() ) + return; + + $id = self::get_settings()->container; + + // Check that we have an id. + if ( empty( $id ) ) + return; + + // Bail if there are not enough posts for infinity. + if ( ! self::set_last_post_time() ) + return; + + // Add a class to the body. + add_filter( 'body_class', array( $this, 'body_class' ) ); + + // Add our scripts. + wp_enqueue_script( 'the-neverending-homepage', plugins_url( 'infinity.js', __FILE__ ), array( 'jquery' ), '20130101' ); + + // Add our default styles. + wp_enqueue_style( 'the-neverending-homepage', plugins_url( 'infinity.css', __FILE__ ), array(), '20120612' ); + + add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_spinner_scripts' ) ); + + add_action( 'wp_head', array( $this, 'action_wp_head' ), 2 ); + + add_action( 'wp_footer', array( $this, 'action_wp_footer' ), 99999999 ); + + add_filter( 'infinite_scroll_results', array( $this, 'filter_infinite_scroll_results' ), 10, 3 ); + } + + /** + * Enqueue spinner scripts. + */ + function enqueue_spinner_scripts() { + wp_enqueue_script( 'jquery.spin' ); + } + + /** + * Adds an 'infinite-scroll' class to the body. + */ + function body_class( $classes ) { + $classes[] = 'infinite-scroll'; + + if ( 'scroll' == self::get_settings()->type ) + $classes[] = 'neverending'; + + return $classes; + } + + /** + * Grab the timestamp for the last post. + * @return string 'Y-m-d H:i:s' or null + */ + function set_last_post_time( $date = false ) { + global $posts; + $count = count( $posts ); + + if ( ! empty( $date ) && preg_match( '|\d{4}\-\d{2}\-\d{2}|', $_GET['date'] ) ) { + self::$the_time = "$date 00:00:00"; + return self::$the_time; + } + + // If we don't have enough posts for infinity, return early + if ( ! $count || $count < self::get_settings()->posts_per_page ) + return self::$the_time; + + $last_post = end( $posts ); + + // If the function is called again but we already have a value, return it + if ( null != self::$the_time ) { + return self::$the_time; + } + else if ( isset( $last_post->post_date_gmt ) ) { + // Grab the latest post time in Y-m-d H:i:s gmt format + self::$the_time = $last_post->post_date_gmt; + } + + return self::$the_time; + } + + /** + * Create a where clause that will make sure post queries + * will always return results prior to (descending sort) + * or before (ascending sort) the last post date. + * + * @param string $where + * @param object $query + * @filter posts_where + * @return string + */ + function query_time_filter( $where, $query ) { + global $wpdb; + + $operator = 'ASC' == $query->get( 'order' ) ? '>' : '<'; + + // Construct the date query using our timestamp + $where .= $wpdb->prepare( " AND post_date_gmt {$operator} %s", self::set_last_post_time() ); + + return $where; + } + + /** + * Let's overwrite the default post_per_page setting to always display a fixed amount. + * + * @global $wp_the_query Used to provide compatibility back to WP 3.2 + * @param object $query + * @uses self::archive_supports_infinity, self::get_settings + * @return null + */ + function posts_per_page_query( $query ) { + global $wp_the_query; + + if ( self::archive_supports_infinity() && $query === $wp_the_query ) // After 3.3, this line would be: if ( self::archive_supports_infinity() && $query->is_main_query() ) + $query->set( 'posts_per_page', self::get_settings()->posts_per_page ); + } + + /** + * Check if the IS output should be wrapped in a div. + * Setting value can be a boolean or a string specifying the class applied to the div. + * + * @uses self::get_settings + * @return bool + */ + function has_wrapper() { + return (bool) self::get_settings()->wrapper; + } + + /** + * Returns the Ajax url + * + * @global $wp + * @uses home_url, is_ssl, add_query_arg, trailingslashit, apply_filters + * @return string + */ + function ajax_url() { + global $wp; + + // When using default permalinks, $wp->request will be null, so we reconstruct the request from the query arguments WP parsed. + if ( is_null( $wp->request ) ) { + $base_url = home_url( '/', is_ssl() ? 'https' : 'http' ); + $base_url = add_query_arg( $wp->query_vars, $base_url ); + } else { + $base_url = home_url( trailingslashit( $wp->request ), is_ssl() ? 'https' : 'http' ); + } + + $ajaxurl = add_query_arg( array( 'infinity' => 'scrolling' ), $base_url ); + + return apply_filters( 'infinite_scroll_ajax_url', $ajaxurl ); + } + + /** + * Our own Ajax response, avoiding calling admin-ajax + */ + function ajax_response() { + // Only proceed if the url query has a key of "Infinity" + if ( ! self::got_infinity() ) + return false; + + define( 'DOING_AJAX', true ); + + @header( 'Content-Type: text/html; charset=' . get_option( 'blog_charset' ) ); + send_nosniff_header(); + + do_action( 'custom_ajax_infinite_scroll' ); + die( '0' ); + } + + /** + * Prints the relevant infinite scroll settings in JS. + * + * @uses self::get_settings, esc_js, esc_url_raw, self::has_wrapper, __, apply_filters, do_action + * @action wp_head + * @return string + */ + function action_wp_head() { + global $wp_query, $wp_the_query, $wp_rewrite; + + // Base JS settings + $js_settings = array( + 'id' => self::get_settings()->container, + 'ajaxurl' => esc_url_raw( self::ajax_url() ), + 'type' => esc_js( self::get_settings()->type ), + 'wrapper' => self::has_wrapper(), + 'wrapper_class' => is_string( self::get_settings()->wrapper ) ? esc_js( self::get_settings()->wrapper ) : 'infinite-wrap', + 'footer' => is_string( self::get_settings()->footer ) ? esc_js( self::get_settings()->footer ) : self::get_settings()->footer, + 'text' => esc_js( __( 'Older posts', 'jetpack' ) ), + 'totop' => esc_js( __( 'Scroll back to top', 'jetpack' ) ), + 'order' => 'DESC', + 'scripts' => array(), + 'styles' => array(), + 'google_analytics' => false, + 'offset' => $wp_query->get( 'paged' ), + 'history' => array( + 'host' => preg_replace( '#^http(s)?://#i', '', untrailingslashit( get_option( 'home' ) ) ), + 'path' => self::get_request_path(), + 'use_trailing_slashes' => $wp_rewrite->use_trailing_slashes + ) + ); + + // Optional order param + if ( isset( $_GET['order'] ) ) { + $order = strtoupper( $_GET['order'] ); + + if ( in_array( $order, array( 'ASC', 'DESC' ) ) ) + $js_settings['order'] = $order; + } + + $js_settings = apply_filters( 'infinite_scroll_js_settings', $js_settings ); + + do_action( 'infinite_scroll_wp_head' ); + + ?> + <script type="text/javascript"> + //<![CDATA[ + var infiniteScroll = <?php echo json_encode( array( 'settings' => $js_settings ) ); ?>; + //]]> + </script> + <?php + } + + /** + * Build path data for current request. + * Used for Google Analytics and pushState history tracking. + * + * @global $wp_rewrite + * @global $wp + * @uses user_trailingslashit, sanitize_text_field, add_query_arg + * @return string|bool + */ + private function get_request_path() { + global $wp_rewrite; + + if ( $wp_rewrite->using_permalinks() ) { + global $wp; + + // If called too early, bail + if ( ! isset( $wp->request ) ) + return false; + + // Determine path for paginated version of current request + if ( false != preg_match( '#' . $wp_rewrite->pagination_base . '/\d+/?$#i', $wp->request ) ) + $path = preg_replace( '#' . $wp_rewrite->pagination_base . '/\d+$#i', $wp_rewrite->pagination_base . '/%d', $wp->request ); + else + $path = $wp->request . '/' . $wp_rewrite->pagination_base . '/%d'; + + // Slashes everywhere we need them + if ( 0 !== strpos( $path, '/' ) ) + $path = '/' . $path; + + $path = user_trailingslashit( $path ); + } + else { + // Clean up raw $_GET input + $path = array_map( 'sanitize_text_field', $_GET ); + $path = array_filter( $path ); + + $path['paged'] = '%d'; + + $path = add_query_arg( $path, '/' ); + } + + return empty( $path ) ? false : $path; + } + + /** + * Provide IS with a list of the scripts and stylesheets already present on the page. + * Since posts may contain require additional assets that haven't been loaded, this data will be used to track the additional assets. + * + * @global $wp_scripts, $wp_styles + * @action wp_footer + * @return string + */ + function action_wp_footer() { + global $wp_scripts, $wp_styles; + + $scripts = is_a( $wp_scripts, 'WP_Scripts' ) ? $wp_scripts->done : array(); + $scripts = apply_filters( 'infinite_scroll_existing_scripts', $scripts ); + + $styles = is_a( $wp_styles, 'WP_Styles' ) ? $wp_styles->done : array(); + $styles = apply_filters( 'infinite_scroll_existing_stylesheets', $styles ); + + ?><script type="text/javascript"> + jQuery.extend( infiniteScroll.settings.scripts, <?php echo json_encode( $scripts ); ?> ); + jQuery.extend( infiniteScroll.settings.styles, <?php echo json_encode( $styles ); ?> ); + </script><?php + } + + /** + * Identify additional scripts required by the latest set of IS posts and provide the necessary data to the IS response handler. + * + * @global $wp_scripts + * @uses sanitize_text_field, add_query_arg + * @filter infinite_scroll_results + * @return array + */ + function filter_infinite_scroll_results( $results, $query_args, $wp_query ) { + // Don't bother unless there are posts to display + if ( 'success' != $results['type'] ) + return $results; + + // Parse and sanitize the script handles already output + $initial_scripts = isset( $_GET['scripts'] ) && is_array( $_GET['scripts'] ) ? array_map( 'sanitize_text_field', $_GET['scripts'] ) : false; + + if ( is_array( $initial_scripts ) ) { + global $wp_scripts; + + // Identify new scripts needed by the latest set of IS posts + $new_scripts = array_diff( $wp_scripts->done, $initial_scripts ); + + // If new scripts are needed, extract relevant data from $wp_scripts + if ( ! empty( $new_scripts ) ) { + $results['scripts'] = array(); + + foreach ( $new_scripts as $handle ) { + // Abort if somehow the handle doesn't correspond to a registered script + if ( ! isset( $wp_scripts->registered[ $handle ] ) ) + continue; + + // Provide basic script data + $script_data = array( + 'handle' => $handle, + 'footer' => ( is_array( $wp_scripts->in_footer ) && in_array( $handle, $wp_scripts->in_footer ) ), + 'extra_data' => $wp_scripts->print_extra_script( $handle, false ) + ); + + // Base source + $src = $wp_scripts->registered[ $handle ]->src; + + // Take base_url into account + if ( strpos( $src, 'http' ) !== 0 ) + $src = $wp_scripts->base_url . $src; + + // Version and additional arguments + if ( null === $wp_scripts->registered[ $handle ]->ver ) + $ver = ''; + else + $ver = $wp_scripts->registered[ $handle ]->ver ? $wp_scripts->registered[ $handle ]->ver : $wp_scripts->default_version; + + if ( isset($wp_scripts->args[ $handle ] ) ) + $ver = $ver ? $ver . '&' . $wp_scripts->args[$handle] : $wp_scripts->args[$handle]; + + // Full script source with version info + $script_data['src'] = add_query_arg( 'ver', $ver, $src ); + + // Add script to data that will be returned to IS JS + array_push( $results['scripts'], $script_data ); + } + } + } + + // Expose additional script data to filters, but only include in final `$results` array if needed. + if ( ! isset( $results['scripts'] ) ) + $results['scripts'] = array(); + + $results['scripts'] = apply_filters( 'infinite_scroll_additional_scripts', $results['scripts'], $initial_scripts, $results, $query_args, $wp_query ); + + if ( empty( $results['scripts'] ) ) + unset( $results['scripts' ] ); + + // Parse and sanitize the style handles already output + $initial_styles = isset( $_GET['styles'] ) && is_array( $_GET['styles'] ) ? array_map( 'sanitize_text_field', $_GET['styles'] ) : false; + + if ( is_array( $initial_styles ) ) { + global $wp_styles; + + // Identify new styles needed by the latest set of IS posts + $new_styles = array_diff( $wp_styles->done, $initial_styles ); + + // If new styles are needed, extract relevant data from $wp_styles + if ( ! empty( $new_styles ) ) { + $results['styles'] = array(); + + foreach ( $new_styles as $handle ) { + // Abort if somehow the handle doesn't correspond to a registered stylesheet + if ( ! isset( $wp_styles->registered[ $handle ] ) ) + continue; + + // Provide basic style data + $style_data = array( + 'handle' => $handle, + 'media' => 'all' + ); + + // Base source + $src = $wp_styles->registered[ $handle ]->src; + + // Take base_url into account + if ( strpos( $src, 'http' ) !== 0 ) + $src = $wp_styles->base_url . $src; + + // Version and additional arguments + if ( null === $wp_styles->registered[ $handle ]->ver ) + $ver = ''; + else + $ver = $wp_styles->registered[ $handle ]->ver ? $wp_styles->registered[ $handle ]->ver : $wp_styles->default_version; + + if ( isset($wp_styles->args[ $handle ] ) ) + $ver = $ver ? $ver . '&' . $wp_styles->args[$handle] : $wp_styles->args[$handle]; + + // Full stylesheet source with version info + $style_data['src'] = add_query_arg( 'ver', $ver, $src ); + + // Parse stylesheet's conditional comments if present, converting to logic executable in JS + if ( isset( $wp_styles->registered[ $handle ]->extra['conditional'] ) && $wp_styles->registered[ $handle ]->extra['conditional'] ) { + // First, convert conditional comment operators to standard logical operators. %ver is replaced in JS with the IE version + $style_data['conditional'] = str_replace( array( + 'lte', + 'lt', + 'gte', + 'gt' + ), array( + '%ver <=', + '%ver <', + '%ver >=', + '%ver >', + ), $wp_styles->registered[ $handle ]->extra['conditional'] ); + + // Next, replace any !IE checks. These shouldn't be present since WP's conditional stylesheet implementation doesn't support them, but someone could be _doing_it_wrong(). + $style_data['conditional'] = preg_replace( '#!\s*IE(\s*\d+){0}#i', '1==2', $style_data['conditional'] ); + + // Lastly, remove the IE strings + $style_data['conditional'] = str_replace( 'IE', '', $style_data['conditional'] ); + } + + // Parse requested media context for stylesheet + if ( isset( $wp_styles->registered[ $handle ]->args ) ) + $style_data['media'] = esc_attr( $wp_styles->registered[ $handle ]->args ); + + // Add stylesheet to data that will be returned to IS JS + array_push( $results['styles'], $style_data ); + } + } + } + + // Expose additional stylesheet data to filters, but only include in final `$results` array if needed. + if ( ! isset( $results['styles'] ) ) + $results['styles'] = array(); + + $results['styles'] = apply_filters( 'infinite_scroll_additional_stylesheets', $results['styles'], $initial_styles, $results, $query_args, $wp_query ); + + if ( empty( $results['styles'] ) ) + unset( $results['styles' ] ); + + // Lastly, return the IS results array + return $results; + } + + /** + * Runs the query and returns the results via JSON. + * Triggered by an AJAX request. + * + * @global $wp_query + * @global $wp_the_query + * @uses current_user_can, get_option, self::set_last_post_time, current_user_can, apply_filters, self::get_settings, add_filter, WP_Query, remove_filter, have_posts, wp_head, do_action, add_action, this::render, this::has_wrapper, esc_attr, wp_footer, sharing_register_post_for_share_counts, get_the_id + * @return string or null + */ + function query() { + global $wp_query, $wp_the_query; + + if ( ! isset( $_GET['page'] ) || ! current_theme_supports( 'infinite-scroll' ) ) + die; + + $page = (int) $_GET['page']; + $sticky = get_option( 'sticky_posts' ); + + if ( ! empty( $_GET['date'] ) ) + self::set_last_post_time( $_GET['date'] ); + + $post_status = array( 'publish' ); + if ( current_user_can( 'read_private_posts' ) ) + array_push( $post_status, 'private' ); + + $order = in_array( $_GET['order'], array( 'ASC', 'DESC' ) ) ? $_GET['order'] : 'DESC'; + + $query_args = array_merge( $wp_the_query->query_vars, array( + 'paged' => $page, + 'post_status' => $post_status, + 'posts_per_page' => self::get_settings()->posts_per_page, + 'post__not_in' => ( array ) $sticky, + 'order' => $order + ) ); + + // By default, don't query for a specific page of a paged post object. + // This argument comes from merging $wp_the_query. + // Since IS is only used on archives, we should always display the first page of any paged content. + unset( $query_args['page'] ); + + $query_args = apply_filters( 'infinite_scroll_query_args', $query_args ); + + // Add query filter that checks for posts below the date + add_filter( 'posts_where', array( $this, 'query_time_filter' ), 10, 2 ); + + $wp_the_query = $wp_query = new WP_Query( $query_args ); + + remove_filter( 'posts_where', array( $this, 'query_time_filter' ), 10, 2 ); + + $results = array(); + + if ( have_posts() ) { + // Fire wp_head to ensure that all necessary scripts are enqueued. Output isn't used, but scripts are extracted in self::action_wp_footer. + ob_start(); + wp_head(); + ob_end_clean(); + + $results['type'] = 'success'; + + // First, try theme's specified rendering handler, either specified via `add_theme_support` or by hooking to this action directly. + ob_start(); + do_action( 'infinite_scroll_render' ); + $results['html'] = ob_get_clean(); + + // Fall back if a theme doesn't specify a rendering function. Because themes may hook additional functions to the `infinite_scroll_render` action, `has_action()` is ineffective here. + if ( empty( $results['html'] ) ) { + add_action( 'infinite_scroll_render', array( $this, 'render' ) ); + rewind_posts(); + + ob_start(); + do_action( 'infinite_scroll_render' ); + $results['html'] = ob_get_clean(); + } + + // If primary and fallback rendering methods fail, prevent further IS rendering attempts. Otherwise, wrap the output if requested. + if ( empty( $results['html'] ) ) { + unset( $results['html'] ); + do_action( 'infinite_scroll_empty' ); + $results['type'] = 'empty'; + } + elseif ( $this->has_wrapper() ) { + $wrapper_classes = is_string( self::get_settings()->wrapper ) ? self::get_settings()->wrapper : 'infinite-wrap'; + $wrapper_classes .= ' infinite-view-' . $page; + $wrapper_classes = trim( $wrapper_classes ); + + $results['html'] = '<div class="' . esc_attr( $wrapper_classes ) . '" id="infinite-view-' . $page . '" data-page-num="' . $page . '">' . $results['html'] . '</div>'; + } + + // Fire wp_footer to ensure that all necessary scripts are enqueued. Output isn't used, but scripts are extracted in self::action_wp_footer. + ob_start(); + wp_footer(); + ob_end_clean(); + + // Loop through posts to capture sharing data for new posts loaded via Infinite Scroll + if ( 'success' == $results['type'] && function_exists( 'sharing_register_post_for_share_counts' ) ) { + global $jetpack_sharing_counts; + + while( have_posts() ) { + the_post(); + + sharing_register_post_for_share_counts( get_the_ID() ); + } + + $results['postflair'] = array_flip( $jetpack_sharing_counts ); + } + } else { + do_action( 'infinite_scroll_empty' ); + $results['type'] = 'empty'; + } + + echo json_encode( apply_filters( 'infinite_scroll_results', $results, $query_args, $wp_query ) ); + die; + } + + /** + * Rendering fallback used when themes don't specify their own handler. + * + * @uses have_posts, the_post, get_template_part, get_post_format + * @action infinite_scroll_render + * @return string + */ + function render() { + while ( have_posts() ) { + the_post(); + + get_template_part( 'content', get_post_format() ); + } + } + + /** + * Allow plugins to filter what archives Infinite Scroll supports + * + * @uses apply_filters, current_theme_supports, is_home, is_archive, self::get_settings + * @return bool + */ + public static function archive_supports_infinity() { + return (bool) apply_filters( 'infinite_scroll_archive_supported', current_theme_supports( 'infinite-scroll' ) && ( is_home() || is_archive() ), self::get_settings() ); + } + + /** + * The Infinite Blog Footer + * + * @uses self::get_settings, self::set_last_post_time, self::archive_supports_infinity, __, wp_get_theme, get_current_theme, apply_filters, home_url, esc_attr, get_bloginfo, bloginfo + * @return string or null + */ + function footer() { + // Bail if theme requested footer not show + if ( false == self::get_settings()->footer ) + return; + + // Bail if there are not enough posts for infinity. + if ( ! self::set_last_post_time() ) + return; + + // We only need the new footer for the 'scroll' type + if ( 'scroll' != self::get_settings()->type || ! self::archive_supports_infinity() ) + return; + + $credits = '<a href="http://wordpress.org/" rel="generator">Proudly powered by WordPress</a> '; + $credits .= sprintf( __( 'Theme: %1$s.', 'jetpack' ), function_exists( 'wp_get_theme' ) ? wp_get_theme()->Name : get_current_theme() ); + $credits = apply_filters( 'infinite_scroll_credit', $credits ); + + ?> + <div id="infinite-footer"> + <div class="container"> + <div class="blog-info"> + <a id="infinity-blog-title" href="<?php echo home_url( '/' ); ?>" title="<?php echo esc_attr( get_bloginfo( 'name', 'display' ) ); ?>" rel="home"> + <?php bloginfo( 'name' ); ?> + </a> + </div> + <div class="blog-credits"> + <?php echo $credits; ?> + </div> + </div> + </div><!-- #infinite-footer --> + <?php + } + + /** + * Ensure that IS doesn't interfere with Grunion by stripping IS query arguments from the Grunion redirect URL. + * When arguments are present, Grunion redirects to the IS AJAX endpoint. + * + * @param string $url + * @uses remove_query_arg + * @filter grunion_contact_form_redirect_url + * @return string + */ + public function filter_grunion_redirect_url( $url ) { + // Remove IS query args, if present + if ( false !== strpos( $url, 'infinity=scrolling' ) ) { + $url = remove_query_arg( array( + 'infinity', + 'action', + 'page', + 'order', + 'scripts', + 'styles' + ), $url ); + } + + return $url; + } +}; + +/** + * Initialize The_Neverending_Home_Page + */ +function the_neverending_home_page_init() { + if ( ! current_theme_supports( 'infinite-scroll' ) ) + return; + + new The_Neverending_Home_Page; +} +add_action( 'init', 'the_neverending_home_page_init', 20 ); + +/** + * Check whether the current theme is infinite-scroll aware. + * If so, include the files which add theme support. + */ +function the_neverending_home_page_theme_support() { + $theme_name = get_stylesheet(); + + $customization_file = apply_filters( 'infinite_scroll_customization_file', dirname( __FILE__ ) . "/themes/{$theme_name}.php", $theme_name ); + + if ( is_readable( $customization_file ) ) + require_once( $customization_file ); +} +add_action( 'after_setup_theme', 'the_neverending_home_page_theme_support', 5 ); |