WordPress 4.4
[autoinstalls/wordpress.git] / wp-admin / includes / theme.php
index 80e967418fa799b2b0abc5140587699022492488..dda79cbd4864561770fe6d26f4c66e58136dfd49 100644 (file)
@@ -6,58 +6,29 @@
  * @subpackage Administration
  */
 
-/**
- * {@internal Missing Short Description}}
- *
- * @since 2.0.0
- *
- * @return unknown
- */
-function current_theme_info() {
-       $themes = get_themes();
-       $current_theme = get_current_theme();
-       if ( ! isset( $themes[$current_theme] ) ) {
-               delete_option( 'current_theme' );
-               $current_theme = get_current_theme();
-       }
-       $ct->name = $current_theme;
-       $ct->title = $themes[$current_theme]['Title'];
-       $ct->version = $themes[$current_theme]['Version'];
-       $ct->parent_theme = $themes[$current_theme]['Parent Theme'];
-       $ct->template_dir = $themes[$current_theme]['Template Dir'];
-       $ct->stylesheet_dir = $themes[$current_theme]['Stylesheet Dir'];
-       $ct->template = $themes[$current_theme]['Template'];
-       $ct->stylesheet = $themes[$current_theme]['Stylesheet'];
-       $ct->screenshot = $themes[$current_theme]['Screenshot'];
-       $ct->description = $themes[$current_theme]['Description'];
-       $ct->author = $themes[$current_theme]['Author'];
-       $ct->tags = $themes[$current_theme]['Tags'];
-       $ct->theme_root = $themes[$current_theme]['Theme Root'];
-       $ct->theme_root_uri = $themes[$current_theme]['Theme Root URI'];
-       return $ct;
-}
-
 /**
  * Remove a theme
  *
  * @since 2.8.0
  *
- * @param string $template Template directory of the theme to delete
+ * @global WP_Filesystem_Base $wp_filesystem Subclass
+ *
+ * @param string $stylesheet Stylesheet of the theme to delete
  * @param string $redirect Redirect to page when complete.
- * @return mixed
+ * @return void|bool|WP_Error When void, echoes content.
  */
-function delete_theme($template, $redirect = '') {
+function delete_theme($stylesheet, $redirect = '') {
        global $wp_filesystem;
 
-       if ( empty($template) )
+       if ( empty($stylesheet) )
                return false;
 
        ob_start();
        if ( empty( $redirect ) )
-               $redirect = wp_nonce_url('themes.php?action=delete&template=' . $template, 'delete-theme_' . $template);
+               $redirect = wp_nonce_url('themes.php?action=delete&stylesheet=' . urlencode( $stylesheet ), 'delete-theme_' . $stylesheet);
        if ( false === ($credentials = request_filesystem_credentials($redirect)) ) {
-               $data = ob_get_contents();
-               ob_end_clean();
+               $data = ob_get_clean();
+
                if ( ! empty($data) ){
                        include_once( ABSPATH . 'wp-admin/admin-header.php');
                        echo $data;
@@ -68,9 +39,9 @@ function delete_theme($template, $redirect = '') {
        }
 
        if ( ! WP_Filesystem($credentials) ) {
-               request_filesystem_credentials($url, '', true); // Failed to connect, Error and request again
-               $data = ob_get_contents();
-               ob_end_clean();
+               request_filesystem_credentials($redirect, '', true); // Failed to connect, Error and request again
+               $data = ob_get_clean();
+
                if ( ! empty($data) ) {
                        include_once( ABSPATH . 'wp-admin/admin-header.php');
                        echo $data;
@@ -80,82 +51,42 @@ function delete_theme($template, $redirect = '') {
                return;
        }
 
-
        if ( ! is_object($wp_filesystem) )
                return new WP_Error('fs_unavailable', __('Could not access filesystem.'));
 
        if ( is_wp_error($wp_filesystem->errors) && $wp_filesystem->errors->get_error_code() )
                return new WP_Error('fs_error', __('Filesystem error.'), $wp_filesystem->errors);
 
-       //Get the base plugin folder
+       // Get the base plugin folder.
        $themes_dir = $wp_filesystem->wp_themes_dir();
-       if ( empty($themes_dir) )
-               return new WP_Error('fs_no_themes_dir', __('Unable to locate WordPress theme directory.'));
+       if ( empty( $themes_dir ) ) {
+               return new WP_Error( 'fs_no_themes_dir', __( 'Unable to locate WordPress theme directory.' ) );
+       }
 
        $themes_dir = trailingslashit( $themes_dir );
-       $theme_dir = trailingslashit($themes_dir . $template);
-       $deleted = $wp_filesystem->delete($theme_dir, true);
-
-       if ( ! $deleted )
-               return new WP_Error('could_not_remove_theme', sprintf(__('Could not fully remove the theme %s.'), $template) );
-
-       // Force refresh of theme update information
-       delete_site_transient('update_themes');
+       $theme_dir = trailingslashit( $themes_dir . $stylesheet );
+       $deleted = $wp_filesystem->delete( $theme_dir, true );
 
-       return true;
-}
+       if ( ! $deleted ) {
+               return new WP_Error( 'could_not_remove_theme', sprintf( __( 'Could not fully remove the theme %s.' ), $stylesheet ) );
+       }
 
-/**
- * {@internal Missing Short Description}}
- *
- * @since 1.5.0
- *
- * @return unknown
- */
-function get_broken_themes() {
-       global $wp_broken_themes;
+       $theme_translations = wp_get_installed_translations( 'themes' );
 
-       get_themes();
-       return $wp_broken_themes;
-}
+       // Remove language files, silently.
+       if ( ! empty( $theme_translations[ $stylesheet ] ) ) {
+               $translations = $theme_translations[ $stylesheet ];
 
-/**
- * Get the allowed themes for the current blog.
- *
- * @since 3.0.0
- *
- * @uses get_themes()
- * @uses current_theme_info()
- * @uses get_site_allowed_themes()
- * @uses wpmu_get_blog_allowedthemes
- *
- * @return array $themes Array of allowed themes.
- */
-function get_allowed_themes() {
-       if ( !is_multisite() )
-               return get_themes();
-
-       $themes = get_themes();
-       $ct = current_theme_info();
-       $allowed_themes = apply_filters("allowed_themes", get_site_allowed_themes() );
-       if ( $allowed_themes == false )
-               $allowed_themes = array();
-
-       $blog_allowed_themes = wpmu_get_blog_allowedthemes();
-       if ( is_array( $blog_allowed_themes ) )
-               $allowed_themes = array_merge( $allowed_themes, $blog_allowed_themes );
-
-       if ( isset( $allowed_themes[ esc_html( $ct->stylesheet ) ] ) == false )
-               $allowed_themes[ esc_html( $ct->stylesheet ) ] = true;
-
-       reset( $themes );
-       foreach ( $themes as $key => $theme ) {
-               if ( isset( $allowed_themes[ esc_html( $theme[ 'Stylesheet' ] ) ] ) == false )
-                       unset( $themes[ $key ] );
+               foreach ( $translations as $translation => $data ) {
+                       $wp_filesystem->delete( WP_LANG_DIR . '/themes/' . $stylesheet . '-' . $translation . '.po' );
+                       $wp_filesystem->delete( WP_LANG_DIR . '/themes/' . $stylesheet . '-' . $translation . '.mo' );
+               }
        }
-       reset( $themes );
 
-       return $themes;
+       // Force refresh of theme update information.
+       delete_site_transient( 'update_themes' );
+
+       return true;
 }
 
 /**
@@ -163,37 +94,11 @@ function get_allowed_themes() {
  *
  * @since 1.5.0
  *
- * @return array Key is template name, Value is template name
+ * @param WP_Post|null $post Optional. The post being edited, provided for context.
+ * @return array Key is the template name, value is the filename of the template
  */
-function get_page_templates() {
-       $themes = get_themes();
-       $theme = get_current_theme();
-       $templates = $themes[$theme]['Template Files'];
-       $page_templates = array();
-
-       if ( is_array( $templates ) ) {
-               $base = array( trailingslashit(get_template_directory()), trailingslashit(get_stylesheet_directory()) );
-
-               foreach ( $templates as $template ) {
-                       $basename = str_replace($base, '', $template);
-
-                       // don't allow template files in subdirectories
-                       if ( false !== strpos($basename, '/') )
-                               continue;
-
-                       $template_data = implode( '', file( $template ));
-
-                       $name = '';
-                       if ( preg_match( '|Template Name:(.*)$|mi', $template_data, $name ) )
-                               $name = _cleanup_header_comment($name[1]);
-
-                       if ( !empty( $name ) ) {
-                               $page_templates[trim( $name )] = $basename;
-                       }
-               }
-       }
-
-       return $page_templates;
+function get_page_templates( $post = null ) {
+       return array_flip( wp_get_theme()->get_page_templates( $post ) );
 }
 
 /**
@@ -216,42 +121,65 @@ function _get_template_edit_filename($fullpath, $containingfolder) {
  * Will display link, if there is an update available.
  *
  * @since 2.7.0
+ * @see get_theme_update_available()
  *
- * @param object $theme Theme data object.
- * @return bool False if no valid info was passed.
+ * @param WP_Theme $theme Theme data object.
  */
 function theme_update_available( $theme ) {
-       static $themes_update;
+       echo get_theme_update_available( $theme );
+}
+
+/**
+ * Retrieve the update link if there is a theme update available.
+ *
+ * Will return a link if there is an update available.
+ *
+ * @since 3.8.0
+ *
+ * @staticvar object $themes_update
+ *
+ * @param WP_Theme $theme WP_Theme object.
+ * @return false|string HTML for the update link, or false if invalid info was passed.
+ */
+function get_theme_update_available( $theme ) {
+       static $themes_update = null;
 
        if ( !current_user_can('update_themes' ) )
-               return;
+               return false;
 
        if ( !isset($themes_update) )
                $themes_update = get_site_transient('update_themes');
 
-       if ( is_object($theme) && isset($theme->stylesheet) )
-               $stylesheet = $theme->stylesheet;
-       elseif ( is_array($theme) && isset($theme['Stylesheet']) )
-               $stylesheet = $theme['Stylesheet'];
-       else
-               return false; //No valid info passed.
+       if ( ! ( $theme instanceof WP_Theme ) ) {
+               return false;
+       }
+
+       $stylesheet = $theme->get_stylesheet();
+
+       $html = '';
 
        if ( isset($themes_update->response[ $stylesheet ]) ) {
                $update = $themes_update->response[ $stylesheet ];
-               $theme_name = is_object($theme) ? $theme->name : (is_array($theme) ? $theme['Name'] : '');
+               $theme_name = $theme->display('Name');
                $details_url = add_query_arg(array('TB_iframe' => 'true', 'width' => 1024, 'height' => 800), $update['url']); //Theme browser inside WP? replace this, Also, theme preview JS will override this on the available list.
-               $update_url = wp_nonce_url('update.php?action=upgrade-theme&theme=' . urlencode($stylesheet), 'upgrade-theme_' . $stylesheet);
-               $update_onclick = 'onclick="if ( confirm(\'' . esc_js( __("Updating this theme will lose any customizations you have made.  'Cancel' to stop, 'OK' to update.") ) . '\') ) {return true;}return false;"';
+               $update_url = wp_nonce_url( admin_url( 'update.php?action=upgrade-theme&theme=' . urlencode( $stylesheet ) ), 'upgrade-theme_' . $stylesheet );
+               $update_onclick = 'onclick="if ( confirm(\'' . esc_js( __("Updating this theme will lose any customizations you have made. 'Cancel' to stop, 'OK' to update.") ) . '\') ) {return true;}return false;"';
 
                if ( !is_multisite() ) {
-                       if ( ! current_user_can('update_themes') )
-                               printf( '<p><strong>' . __('There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%1$s">View version %3$s details</a>.') . '</strong></p>', $theme_name, $details_url, $update['new_version']);
-                       else if ( empty($update['package']) )
-                               printf( '<p><strong>' . __('There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%1$s">View version %3$s details</a>. <em>Automatic update is unavailable for this theme.</em>') . '</strong></p>', $theme_name, $details_url, $update['new_version']);
-                       else
-                               printf( '<p><strong>' . __('There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%1$s">View version %3$s details</a> or <a href="%4$s" %5$s>update automatically</a>.') . '</strong></p>', $theme_name, $details_url, $update['new_version'], $update_url, $update_onclick );
+                       if ( ! current_user_can('update_themes') ) {
+                               $html = sprintf( '<p><strong>' . __( 'There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%3$s">View version %4$s details</a>.' ) . '</strong></p>',
+                                       $theme_name, esc_url( $details_url ), esc_attr( $theme['Name'] ), $update['new_version'] );
+                       } elseif ( empty( $update['package'] ) ) {
+                               $html = sprintf( '<p><strong>' . __( 'There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%3$s">View version %4$s details</a>. <em>Automatic update is unavailable for this theme.</em>' ) . '</strong></p>',
+                                       $theme_name, esc_url( $details_url ), esc_attr( $theme['Name'] ), $update['new_version'] );
+                       } else {
+                               $html = sprintf( '<p><strong>' . __( 'There is a new version of %1$s available. <a href="%2$s" class="thickbox" title="%3$s">View version %4$s details</a> or <a href="%5$s">update now</a>.' ) . '</strong></p>',
+                                       $theme_name, esc_url( $details_url ), esc_attr( $theme['Name'] ), $update['new_version'], $update_url, $update_onclick );
+                       }
                }
        }
+
+       return $html;
 }
 
 /**
@@ -259,15 +187,17 @@ function theme_update_available( $theme ) {
  *
  * @since 3.1.0
  *
- * @return array  Array of features keyed by category with translations keyed by slug.
+ * @param bool $api Optional. Whether try to fetch tags from the WordPress.org API. Defaults to true.
+ * @return array Array of features keyed by category with translations keyed by slug.
  */
-function get_theme_feature_list() {
+function get_theme_feature_list( $api = true ) {
        // Hard-coded list is used if api not accessible.
        $features = array(
-                       __('Colors') => array(
+                       __( 'Colors' ) => array(
                                'black'   => __( 'Black' ),
                                'blue'    => __( 'Blue' ),
                                'brown'   => __( 'Brown' ),
+                               'gray'    => __( 'Gray' ),
                                'green'   => __( 'Green' ),
                                'orange'  => __( 'Orange' ),
                                'pink'    => __( 'Pink' ),
@@ -278,55 +208,59 @@ function get_theme_feature_list() {
                                'white'   => __( 'White' ),
                                'yellow'  => __( 'Yellow' ),
                                'dark'    => __( 'Dark' ),
-                               'light'   => __( 'Light ')
+                               'light'   => __( 'Light' ),
                        ),
 
-               __('Columns') => array(
+               __( 'Layout' ) => array(
+                       'fixed-layout'      => __( 'Fixed Layout' ),
+                       'fluid-layout'      => __( 'Fluid Layout' ),
+                       'responsive-layout' => __( 'Responsive Layout' ),
                        'one-column'    => __( 'One Column' ),
                        'two-columns'   => __( 'Two Columns' ),
                        'three-columns' => __( 'Three Columns' ),
                        'four-columns'  => __( 'Four Columns' ),
                        'left-sidebar'  => __( 'Left Sidebar' ),
-                       'right-sidebar' => __( 'Right Sidebar' )
-               ),
-
-               __('Width') => array(
-                       'fixed-width'    => __( 'Fixed Width' ),
-                       'flexible-width' => __( 'Flexible Width' )
+                       'right-sidebar' => __( 'Right Sidebar' ),
                ),
 
                __( 'Features' ) => array(
-                       'blavatar'             => __( 'Blavatar' ),
-                       'buddypress'           => __( 'BuddyPress' ),
-                       'custom-background'    => __( 'Custom Background' ),
-                       'custom-colors'        => __( 'Custom Colors' ),
-                       'custom-header'        => __( 'Custom Header' ),
-                       'custom-menu'          => __( 'Custom Menu' ),
-                       'editor-style'         => __( 'Editor Style' ),
-                       'front-page-post-form' => __( 'Front Page Posting' ),
-                       'microformats'         => __( 'Microformats' ),
-                       'sticky-post'          => __( 'Sticky Post' ),
-                       'theme-options'        => __( 'Theme Options' ),
-                       'threaded-comments'    => __( 'Threaded Comments' ),
-                       'translation-ready'    => __( 'Translation Ready' ),
-                       'rtl-language-support' => __( 'RTL Language Support' )
+                       'accessibility-ready'   => __( 'Accessibility Ready' ),
+                       'blavatar'              => __( 'Blavatar' ),
+                       'buddypress'            => __( 'BuddyPress' ),
+                       'custom-background'     => __( 'Custom Background' ),
+                       'custom-colors'         => __( 'Custom Colors' ),
+                       'custom-header'         => __( 'Custom Header' ),
+                       'custom-menu'           => __( 'Custom Menu' ),
+                       'editor-style'          => __( 'Editor Style' ),
+                       'featured-image-header' => __( 'Featured Image Header' ),
+                       'featured-images'       => __( 'Featured Images' ),
+                       'flexible-header'       => __( 'Flexible Header' ),
+                       'front-page-post-form'  => __( 'Front Page Posting' ),
+                       'full-width-template'   => __( 'Full Width Template' ),
+                       'microformats'          => __( 'Microformats' ),
+                       'post-formats'          => __( 'Post Formats' ),
+                       'rtl-language-support'  => __( 'RTL Language Support' ),
+                       'sticky-post'           => __( 'Sticky Post' ),
+                       'theme-options'         => __( 'Theme Options' ),
+                       'threaded-comments'     => __( 'Threaded Comments' ),
+                       'translation-ready'     => __( 'Translation Ready' ),
                ),
 
                __( 'Subject' )  => array(
-                       'holiday' => __( 'Holiday' ),
+                       'holiday'       => __( 'Holiday' ),
                        'photoblogging' => __( 'Photoblogging' ),
-                       'seasonal' => __( 'Seasonal' )
+                       'seasonal'      => __( 'Seasonal' ),
                )
        );
 
-       if ( !current_user_can('install_themes') )
+       if ( ! $api || ! current_user_can( 'install_themes' ) )
                return $features;
 
        if ( !$feature_list = get_site_transient( 'wporg_theme_feature_list' ) )
-               set_site_transient( 'wporg_theme_feature_list', array( ),  10800);
+               set_site_transient( 'wporg_theme_feature_list', array(), 3 * HOUR_IN_SECONDS );
 
        if ( !$feature_list ) {
-               $feature_list = themes_api( 'feature_list', array( ) );
+               $feature_list = themes_api( 'feature_list', array() );
                if ( is_wp_error( $feature_list ) )
                        return $features;
        }
@@ -334,10 +268,14 @@ function get_theme_feature_list() {
        if ( !$feature_list )
                return $features;
 
-       set_site_transient( 'wporg_theme_feature_list', $feature_list, 10800 );
+       set_site_transient( 'wporg_theme_feature_list', $feature_list, 3 * HOUR_IN_SECONDS );
 
-       $category_translations = array( 'Colors' => __('Colors'), 'Columns' => __('Columns'), 'Width' => __('Width'),
-                                                                  'Features' => __('Features'), 'Subject' => __('Subject') );
+       $category_translations = array(
+               'Colors'   => __( 'Colors' ),
+               'Layout'   => __( 'Layout' ),
+               'Features' => __( 'Features' ),
+               'Subject'  => __( 'Subject' )
+       );
 
        // Loop over the wporg canonical list and apply translations
        $wporg_features = array();
@@ -358,48 +296,337 @@ function get_theme_feature_list() {
 }
 
 /**
- * Retrieve theme installer pages from WordPress Themes API.
+ * Retrieves theme installer pages from the WordPress.org Themes API.
  *
  * It is possible for a theme to override the Themes API result with three
  * filters. Assume this is for themes, which can extend on the Theme Info to
  * offer more choices. This is very powerful and must be used with care, when
- * overridding the filters.
+ * overriding the filters.
+ *
+ * The first filter, {@see 'themes_api_args'}, is for the args and gives the action
+ * as the second parameter. The hook for {@see 'themes_api_args'} must ensure that
+ * an object is returned.
+ *
+ * The second filter, {@see 'themes_api'}, allows a plugin to override the WordPress.org
+ * Theme API entirely. If `$action` is 'query_themes', 'theme_information', or 'feature_list',
+ * an object MUST be passed. If `$action` is 'hot_tags`, an array should be passed.
+ *
+ * Finally, the third filter, {@see 'themes_api_result'}, makes it possible to filter the
+ * response object or array, depending on the `$action` type.
  *
- * The first filter, 'themes_api_args', is for the args and gives the action as
- * the second parameter. The hook for 'themes_api_args' must ensure that an
- * object is returned.
+ * Supported arguments per action:
  *
- * The second filter, 'themes_api', is the result that would be returned.
+ * | Argument Name      | 'query_themes' | 'theme_information' | 'hot_tags' | 'feature_list'   |
+ * | -------------------| :------------: | :-----------------: | :--------: | :--------------: |
+ * | `$slug`            | No             |  Yes                | No         | No               |
+ * | `$per_page`        | Yes            |  No                 | No         | No               |
+ * | `$page`            | Yes            |  No                 | No         | No               |
+ * | `$number`          | No             |  No                 | Yes        | No               |
+ * | `$search`          | Yes            |  No                 | No         | No               |
+ * | `$tag`             | Yes            |  No                 | No         | No               |
+ * | `$author`          | Yes            |  No                 | No         | No               |
+ * | `$user`            | Yes            |  No                 | No         | No               |
+ * | `$browse`          | Yes            |  No                 | No         | No               |
+ * | `$locale`          | Yes            |  Yes                | No         | No               |
+ * | `$fields`          | Yes            |  Yes                | No         | No               |
  *
  * @since 2.8.0
  *
- * @param string $action
- * @param array|object $args Optional. Arguments to serialize for the Theme Info API.
- * @return mixed
+ * @param string       $action API action to perform: 'query_themes', 'theme_information',
+ *                             'hot_tags' or 'feature_list'.
+ * @param array|object $args   {
+ *     Optional. Array or object of arguments to serialize for the Plugin Info API.
+ *
+ *     @type string  $slug     The plugin slug. Default empty.
+ *     @type int     $per_page Number of themes per page. Default 24.
+ *     @type int     $page     Number of current page. Default 1.
+ *     @type int     $number   Number of tags to be queried.
+ *     @type string  $search   A search term. Default empty.
+ *     @type string  $tag      Tag to filter themes. Default empty.
+ *     @type string  $author   Username of an author to filter themes. Default empty.
+ *     @type string  $user     Username to query for their favorites. Default empty.
+ *     @type string  $browse   Browse view: 'featured', 'popular', 'updated', 'favorites'.
+ *     @type string  $locale   Locale to provide context-sensitive results. Default is the value of get_locale().
+ *     @type array   $fields   {
+ *         Array of fields which should or should not be returned.
+ *
+ *         @type bool $description        Whether to return the theme full description. Default false.
+ *         @type bool $sections           Whether to return the theme readme sections: description, installation,
+ *                                        FAQ, screenshots, other notes, and changelog. Default false.
+ *         @type bool $rating             Whether to return the rating in percent and total number of ratings.
+ *                                        Default false.
+ *         @type bool $ratings            Whether to return the number of rating for each star (1-5). Default false.
+ *         @type bool $downloaded         Whether to return the download count. Default false.
+ *         @type bool $downloadlink       Whether to return the download link for the package. Default false.
+ *         @type bool $last_updated       Whether to return the date of the last update. Default false.
+ *         @type bool $tags               Whether to return the assigned tags. Default false.
+ *         @type bool $homepage           Whether to return the theme homepage link. Default false.
+ *         @type bool $screenshots        Whether to return the screenshots. Default false.
+ *         @type int  $screenshot_count   Number of screenshots to return. Default 1.
+ *         @type bool $screenshot_url     Whether to return the URL of the first screenshot. Default false.
+ *         @type bool $photon_screenshots Whether to return the screenshots via Photon. Default false.
+ *         @type bool $template           Whether to return the slug of the parent theme. Default false.
+ *         @type bool $parent             Whether to return the slug, name and homepage of the parent theme. Default false.
+ *         @type bool $versions           Whether to return the list of all available versions. Default false.
+ *         @type bool $theme_url          Whether to return theme's URL. Default false.
+ *         @type bool $extended_author    Whether to return nicename or nicename and display name. Default false.
+ *     }
+ * }
+ * @return object|array|WP_Error Response object or array on success, WP_Error on failure. See the
+ *         {@link https://developer.wordpress.org/reference/functions/themes_api/ function reference article}
+ *         for more information on the make-up of possible return objects depending on the value of `$action`.
  */
-function themes_api($action, $args = null) {
+function themes_api( $action, $args = array() ) {
 
-       if ( is_array($args) )
-               $args = (object)$args;
+       if ( is_array( $args ) ) {
+               $args = (object) $args;
+       }
 
-       if ( !isset($args->per_page) )
+       if ( ! isset( $args->per_page ) ) {
                $args->per_page = 24;
+       }
+
+       if ( ! isset( $args->locale ) ) {
+               $args->locale = get_locale();
+       }
 
-       $args = apply_filters('themes_api_args', $args, $action); //NOTE: Ensure that an object is returned via this filter.
-       $res = apply_filters('themes_api', false, $action, $args); //NOTE: Allows a theme to completely override the builtin WordPress.org API.
+       /**
+        * Filter arguments used to query for installer pages from the WordPress.org Themes API.
+        *
+        * Important: An object MUST be returned to this filter.
+        *
+        * @since 2.8.0
+        *
+        * @param object $args   Arguments used to query for installer pages from the WordPress.org Themes API.
+        * @param string $action Requested action. Likely values are 'theme_information',
+        *                       'feature_list', or 'query_themes'.
+        */
+       $args = apply_filters( 'themes_api_args', $args, $action );
+
+       /**
+        * Filter whether to override the WordPress.org Themes API.
+        *
+        * Passing a non-false value will effectively short-circuit the WordPress.org API request.
+        *
+        * If `$action` is 'query_themes', 'theme_information', or 'feature_list', an object MUST
+        * be passed. If `$action` is 'hot_tags`, an array should be passed.
+        *
+        * @since 2.8.0
+        *
+        * @param false|object|array $override Whether to override the WordPress.org Themes API. Default false.
+        * @param string             $action   Requested action. Likely values are 'theme_information',
+        *                                    'feature_list', or 'query_themes'.
+        * @param object             $args     Arguments used to query for installer pages from the Themes API.
+        */
+       $res = apply_filters( 'themes_api', false, $action, $args );
 
        if ( ! $res ) {
-               $request = wp_remote_post('http://api.wordpress.org/themes/info/1.0/', array( 'body' => array('action' => $action, 'request' => serialize($args))) );
+               $url = $http_url = 'http://api.wordpress.org/themes/info/1.0/';
+               if ( $ssl = wp_http_supports( array( 'ssl' ) ) )
+                       $url = set_url_scheme( $url, 'https' );
+
+               $http_args = array(
+                       'body' => array(
+                               'action' => $action,
+                               'request' => serialize( $args )
+                       )
+               );
+               $request = wp_remote_post( $url, $http_args );
+
+               if ( $ssl && is_wp_error( $request ) ) {
+                       if ( ! defined( 'DOING_AJAX' ) || ! DOING_AJAX ) {
+                               trigger_error( __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="https://wordpress.org/support/">support forums</a>.' ) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ), headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE );
+                       }
+                       $request = wp_remote_post( $http_url, $http_args );
+               }
+
                if ( is_wp_error($request) ) {
-                       $res = new WP_Error('themes_api_failed', __('An Unexpected HTTP Error occurred during the API request.'), $request->get_error_message() );
+                       $res = new WP_Error('themes_api_failed', __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="https://wordpress.org/support/">support forums</a>.' ), $request->get_error_message() );
                } else {
-                       $res = unserialize($request['body']);
-                       if ( ! $res )
-                       $res = new WP_Error('themes_api_failed', __('An unknown error occurred.'), $request['body']);
+                       $res = maybe_unserialize( wp_remote_retrieve_body( $request ) );
+                       if ( ! is_object( $res ) && ! is_array( $res ) )
+                               $res = new WP_Error('themes_api_failed', __( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="https://wordpress.org/support/">support forums</a>.' ), wp_remote_retrieve_body( $request ) );
                }
        }
-       //var_dump(array($args, $res));
-       return apply_filters('themes_api_result', $res, $action, $args);
+
+       /**
+        * Filter the returned WordPress.org Themes API response.
+        *
+        * @since 2.8.0
+        *
+        * @param array|object $res    WordPress.org Themes API response.
+        * @param string       $action Requested action. Likely values are 'theme_information',
+        *                             'feature_list', or 'query_themes'.
+        * @param object       $args   Arguments used to query for installer pages from the WordPress.org Themes API.
+        */
+       return apply_filters( 'themes_api_result', $res, $action, $args );
 }
 
-?>
+/**
+ * Prepare themes for JavaScript.
+ *
+ * @since 3.8.0
+ *
+ * @param array $themes Optional. Array of WP_Theme objects to prepare.
+ *                      Defaults to all allowed themes.
+ *
+ * @return array An associative array of theme data, sorted by name.
+ */
+function wp_prepare_themes_for_js( $themes = null ) {
+       $current_theme = get_stylesheet();
+
+       /**
+        * Filter theme data before it is prepared for JavaScript.
+        *
+        * Passing a non-empty array will result in wp_prepare_themes_for_js() returning
+        * early with that value instead.
+        *
+        * @since 4.2.0
+        *
+        * @param array      $prepared_themes An associative array of theme data. Default empty array.
+        * @param null|array $themes          An array of WP_Theme objects to prepare, if any.
+        * @param string     $current_theme   The current theme slug.
+        */
+       $prepared_themes = (array) apply_filters( 'pre_prepare_themes_for_js', array(), $themes, $current_theme );
+
+       if ( ! empty( $prepared_themes ) ) {
+               return $prepared_themes;
+       }
+
+       // Make sure the current theme is listed first.
+       $prepared_themes[ $current_theme ] = array();
+
+       if ( null === $themes ) {
+               $themes = wp_get_themes( array( 'allowed' => true ) );
+               if ( ! isset( $themes[ $current_theme ] ) ) {
+                       $themes[ $current_theme ] = wp_get_theme();
+               }
+       }
+
+       $updates = array();
+       if ( current_user_can( 'update_themes' ) ) {
+               $updates_transient = get_site_transient( 'update_themes' );
+               if ( isset( $updates_transient->response ) ) {
+                       $updates = $updates_transient->response;
+               }
+       }
+
+       WP_Theme::sort_by_name( $themes );
+
+       $parents = array();
+
+       foreach ( $themes as $theme ) {
+               $slug = $theme->get_stylesheet();
+               $encoded_slug = urlencode( $slug );
+
+               $parent = false;
+               if ( $theme->parent() ) {
+                       $parent = $theme->parent()->display( 'Name' );
+                       $parents[ $slug ] = $theme->parent()->get_stylesheet();
+               }
+
+               $customize_action = null;
+               if ( current_user_can( 'edit_theme_options' ) && current_user_can( 'customize' ) ) {
+                       $customize_action = esc_url( add_query_arg(
+                               array(
+                                       'return' => urlencode( esc_url_raw( wp_unslash( $_SERVER['REQUEST_URI'] ) ) ),
+                               ),
+                               wp_customize_url( $slug )
+                       ) );
+               }
+
+               $prepared_themes[ $slug ] = array(
+                       'id'           => $slug,
+                       'name'         => $theme->display( 'Name' ),
+                       'screenshot'   => array( $theme->get_screenshot() ), // @todo multiple
+                       'description'  => $theme->display( 'Description' ),
+                       'author'       => $theme->display( 'Author', false, true ),
+                       'authorAndUri' => $theme->display( 'Author' ),
+                       'version'      => $theme->display( 'Version' ),
+                       'tags'         => $theme->display( 'Tags' ),
+                       'parent'       => $parent,
+                       'active'       => $slug === $current_theme,
+                       'hasUpdate'    => isset( $updates[ $slug ] ),
+                       'update'       => get_theme_update_available( $theme ),
+                       'actions'      => array(
+                               'activate' => current_user_can( 'switch_themes' ) ? wp_nonce_url( admin_url( 'themes.php?action=activate&amp;stylesheet=' . $encoded_slug ), 'switch-theme_' . $slug ) : null,
+                               'customize' => $customize_action,
+                               'delete'   => current_user_can( 'delete_themes' ) ? wp_nonce_url( admin_url( 'themes.php?action=delete&amp;stylesheet=' . $encoded_slug ), 'delete-theme_' . $slug ) : null,
+                       ),
+               );
+       }
+
+       // Remove 'delete' action if theme has an active child
+       if ( ! empty( $parents ) && array_key_exists( $current_theme, $parents ) ) {
+               unset( $prepared_themes[ $parents[ $current_theme ] ]['actions']['delete'] );
+       }
+
+       /**
+        * Filter the themes prepared for JavaScript, for themes.php.
+        *
+        * Could be useful for changing the order, which is by name by default.
+        *
+        * @since 3.8.0
+        *
+        * @param array $prepared_themes Array of themes.
+        */
+       $prepared_themes = apply_filters( 'wp_prepare_themes_for_js', $prepared_themes );
+       $prepared_themes = array_values( $prepared_themes );
+       return array_filter( $prepared_themes );
+}
+
+/**
+ * Print JS templates for the theme-browsing UI in the Customizer.
+ *
+ * @since 4.2.0
+ */
+function customize_themes_print_templates() {
+       $preview_url = esc_url( add_query_arg( 'theme', '__THEME__' ) ); // Token because esc_url() strips curly braces.
+       $preview_url = str_replace( '__THEME__', '{{ data.id }}', $preview_url );
+       ?>
+       <script type="text/html" id="tmpl-customize-themes-details-view">
+               <div class="theme-backdrop"></div>
+               <div class="theme-wrap">
+                       <div class="theme-header">
+                               <button type="button" class="left dashicons dashicons-no"><span class="screen-reader-text"><?php _e( 'Show previous theme' ); ?></span></button>
+                               <button type="button" class="right dashicons dashicons-no"><span class="screen-reader-text"><?php _e( 'Show next theme' ); ?></span></button>
+                               <button type="button" class="close dashicons dashicons-no"><span class="screen-reader-text"><?php _e( 'Close details dialog' ); ?></span></button>
+                       </div>
+                       <div class="theme-about">
+                               <div class="theme-screenshots">
+                               <# if ( data.screenshot[0] ) { #>
+                                       <div class="screenshot"><img src="{{ data.screenshot[0] }}" alt="" /></div>
+                               <# } else { #>
+                                       <div class="screenshot blank"></div>
+                               <# } #>
+                               </div>
+
+                               <div class="theme-info">
+                                       <# if ( data.active ) { #>
+                                               <span class="current-label"><?php _e( 'Current Theme' ); ?></span>
+                                       <# } #>
+                                       <h2 class="theme-name">{{{ data.name }}}<span class="theme-version"><?php printf( __( 'Version: %s' ), '{{ data.version }}' ); ?></span></h2>
+                                       <h3 class="theme-author"><?php printf( __( 'By %s' ), '{{{ data.authorAndUri }}}' ); ?></h3>
+                                       <p class="theme-description">{{{ data.description }}}</p>
+
+                                       <# if ( data.parent ) { #>
+                                               <p class="parent-theme"><?php printf( __( 'This is a child theme of %s.' ), '<strong>{{{ data.parent }}}</strong>' ); ?></p>
+                                       <# } #>
+
+                                       <# if ( data.tags ) { #>
+                                               <p class="theme-tags"><span><?php _e( 'Tags:' ); ?></span> {{ data.tags }}</p>
+                                       <# } #>
+                               </div>
+                       </div>
+
+                       <# if ( ! data.active ) { #>
+                               <div class="theme-actions">
+                                       <div class="inactive-theme">
+                                               <a href="<?php echo $preview_url; ?>" target="_top" class="button button-primary"><?php _e( 'Live Preview' ); ?></a>
+                                       </div>
+                               </div>
+                       <# } #>
+               </div>
+       </script>
+       <?php
+}