Source
File: wp-admin/includes/class-theme-upgrader.php
public function check_parent_theme_filter( $install_result, $hook_extra, $child_result ) {
// Check to see if we need to install a parent theme.
$theme_info = $this->theme_info();
if ( ! $theme_info->parent() ) {
return $install_result;
}
$this->skin->feedback( 'parent_theme_search' );
if ( ! $theme_info->parent()->errors() ) {
$this->skin->feedback( 'parent_theme_currently_installed', $theme_info->parent()->display( 'Name' ), $theme_info->parent()->display( 'Version' ) );
// We already have the theme, fall through.
return $install_result;
}
// We don't have the parent theme, let's install it.
$api = themes_api(
'theme_information',
array(
'slug' => $theme_info->get( 'Template' ),
'fields' => array(
'sections' => false,
'tags' => false,
),
)
); // Save on a bit of bandwidth.
if ( ! $api || is_wp_error( $api ) ) {
$this->skin->feedback( 'parent_theme_not_found', $theme_info->get( 'Template' ) );
// Don't show activate or preview actions after installation.
add_filter( 'install_theme_complete_actions', array( $this, 'hide_activate_preview_actions' ) );
return $install_result;
}
// Backup required data we're going to override:
$child_api = $this->skin->api;
$child_success_message = $this->strings['process_success'];
// Override them.
$this->skin->api = $api;
$this->strings['process_success_specific'] = $this->strings['parent_theme_install_success'];
$this->skin->feedback( 'parent_theme_prepare_install', $api->name, $api->version );
add_filter( 'install_theme_complete_actions', '__return_false', 999 ); // Don't show any actions after installing the theme.
// Install the parent theme.
$parent_result = $this->run(
array(
'package' => $api->download_link,
'destination' => get_theme_root(),
'clear_destination' => false, // Do not overwrite files.
'clear_working' => true,
)
);
if ( is_wp_error( $parent_result ) ) {
add_filter( 'install_theme_complete_actions', array( $this, 'hide_activate_preview_actions' ) );
}
// Start cleaning up after the parent's installation.
remove_filter( 'install_theme_complete_actions', '__return_false', 999 );
// Reset child's result and data.
$this->result = $child_result;
$this->skin->api = $child_api;
$this->strings['process_success'] = $child_success_message;
return $install_result;
}