Introduce wp_no_robots(). Call it for pages that should never be indexed, regardless of blog privacy settings. Props nacin. fixes #19251

git-svn-id: http://svn.automattic.com/wordpress/trunk@19304 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/options-writing.php

@@ -157,7 +157,7 @@ wp_dropdown_categories(array('hide_empty' => 0, 'name' => 'default_email_categor
 <?php if ( apply_filters( 'enable_update_services_configuration', true ) ) { ?>
 <h3><?php _e('Update Services') ?></h3>
 
-<?php if ( get_option('blog_public') ) : ?>
+<?php if ( 1 == get_option('blog_public') ) : ?>
 
 <p><label for="ping_sites"><?php _e('When you publish a new post, WordPress automatically notifies the following site update services. For more about this, see <a href="http://codex.wordpress.org/Update_Services">Update Services</a> on the Codex. Separate multiple service <abbr title="Universal Resource Locator">URL</abbr>s with line breaks.') ?></label></p>
 

wp-includes/default-filters.php

@@ -219,7 +219,7 @@ add_action( 'init',                'check_theme_switched',            99    );
 add_action( 'after_switch_theme',  '_wp_sidebars_changed'                   );
 
 if ( isset( $_GET['replytocom'] ) )
-    add_filter( 'pre_option_blog_public', '__return_zero' );
+    add_action( 'wp_head', 'wp_no_robots' );
 
 // Login actions
 add_action( 'login_head',          'wp_print_head_scripts',         9     );

wp-includes/functions.php

@@ -1849,7 +1849,7 @@ function do_robots() {
 
 	$output = "User-agent: *\n";
 	$public = get_option( 'blog_public' );
-	if ( '0' ==  $public ) {
+	if ( '0' == $public ) {
 		$output .= "Disallow: /\n";
 	} else {
 		$site_url = parse_url( site_url() );

wp-includes/general-template.php

@@ -1677,14 +1677,29 @@ function wlwmanifest_link() {
  * Display a noindex meta tag if required by the blog configuration.
  *
  * If a blog is marked as not being public then the noindex meta tag will be
- * output to tell web robots not to index the page content.
+ * output to tell web robots not to index the page content. Add this to the wp_head action.
+ * Typical usage is as a wp_head callback. add_action( 'wp_head', 'noindex' );
+ *
+ * @see wp_no_robots
  *
  * @since 2.1.0
  */
 function noindex() {
 	// If the blog is not public, tell robots to go away.
 	if ( '0' == get_option('blog_public') )
-		echo "<meta name='robots' content='noindex,nofollow' />\n";
+		wp_no_robots();
+}
+
+/**
+ * Display a noindex meta tag.
+ *
+ * Outputs a noindex meta tag that tells web robots not to index the page content.
+ * Typical usage is as a wp_head callback. add_action( 'wp_head', 'wp_no_robots' );
+ *
+ * @since 3.3.0
+ */
+function wp_no_robots() {
+	echo "<meta name='robots' content='noindex,nofollow' />\n";
 }
 
 /**

wp-login.php

@@ -42,8 +42,7 @@ function login_header($title = 'Log In', $message = '', $wp_error = '') {
 	global $error, $is_iphone, $interim_login, $current_site;
 
 	// Don't index any of these forms
-	add_filter( 'pre_option_blog_public', '__return_zero' );
-	add_action( 'login_head', 'noindex' );
+	add_action( 'login_head', 'wp_no_robots' );
 
 	if ( empty($wp_error) )
 		$wp_error = new WP_Error();

wp-signup.php

@@ -3,7 +3,7 @@
 /** Sets up the WordPress Environment. */
 require( dirname(__FILE__) . '/wp-load.php' );
 
-add_action( 'wp_head', 'signuppageheaders' ) ;
+add_action( 'wp_head', 'wp_no_robots' );
 
 require( './wp-blog-header.php' );
 
@@ -17,10 +17,6 @@ function do_signup_header() {
 }
 add_action( 'wp_head', 'do_signup_header' );
 
-function signuppageheaders() {
-	echo "<meta name='robots' content='noindex,nofollow' />\n";
-}
-
 if ( !is_multisite() ) {
 	wp_redirect( site_url('wp-login.php?action=register') );
 	die();