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<title>[15641] trunk/wp-includes/theme.php: Don'
 t fetch theme_roots transient on every page load.</title>
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<body>

<div id="msg">
<dl>
<dt>Revision</dt> <dd><a href="http://trac.wordpress.org/changeset/15641">15641</a></dd>
<dt>Author</dt> <dd>ryan</dd>
<dt>Date</dt> <dd>2010-09-21 19:41:35 +0000 (Tue, 21 Sep 2010)</dd>
</dl>

<h3>Log Message</h3>
<pre>Don't fetch theme_roots transient on every page load.  Avoid it altogether if there is only one theme dir.  fixes <a href="http://trac.wordpress.org/ticket/14911">#14911</a></pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpincludesthemephp">trunk/wp-includes/theme.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunkwpincludesthemephp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/theme.php (15640 => 15641)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/theme.php        2010-09-21 14:52:03 UTC (rev 15640)
+++ trunk/wp-includes/theme.php        2010-09-21 19:41:35 UTC (rev 15641)
</span><span class="lines">@@ -466,9 +466,14 @@
</span><span class="cx">  *
</span><span class="cx">  * @since 2.9.0
</span><span class="cx">  *
</span><del>- * @return array Theme roots
</del><ins>+ * @return array|string An arry of theme roots keyed by template/stylesheet or a single theme root if all themes have the same root.
</ins><span class="cx">  */
</span><span class="cx"> function get_theme_roots() {
</span><ins>+        global $wp_theme_directories;
+
+        if ( count($wp_theme_directories &lt;= 1) )
+                return '/themes';
+
</ins><span class="cx">         $theme_roots = get_site_transient( 'theme_roots' );
</span><span class="cx">         if ( false === $theme_roots ) {
</span><span class="cx">                 get_themes();
</span><span class="lines">@@ -651,11 +656,9 @@
</span><span class="cx">  * @return string Theme path.
</span><span class="cx">  */
</span><span class="cx"> function get_theme_root( $stylesheet_or_template = false ) {
</span><del>-        if ($stylesheet_or_template) {
-                $theme_roots = get_theme_roots();
-
-                if ( ! empty( $theme_roots[$stylesheet_or_template] ) )
-                        $theme_root = WP_CONTENT_DIR . $theme_roots[$stylesheet_or_template];
</del><ins>+        if ( $stylesheet_or_template ) {
+                if ( $theme_root = get_raw_theme_root($stylesheet_or_template) )
+                        $theme_root = WP_CONTENT_DIR . $theme_root;
</ins><span class="cx">                 else
</span><span class="cx">                         $theme_root = WP_CONTENT_DIR . '/themes';
</span><span class="cx">         } else {
</span><span class="lines">@@ -676,17 +679,50 @@
</span><span class="cx">  * @return string Themes URI.
</span><span class="cx">  */
</span><span class="cx"> function get_theme_root_uri( $stylesheet_or_template = false ) {
</span><del>-        $theme_roots = get_theme_roots();
-
-        if ( isset( $theme_roots[$stylesheet_or_template] ) &amp;&amp; $theme_roots[$stylesheet_or_template] )
-                $theme_root_uri = content_url( $theme_roots[$stylesheet_or_template] );
-        else
</del><ins>+        if ( $stylesheet_or_template ) {
+                if ( $theme_root = get_raw_theme_root($stylesheet_or_template) )
+                        $theme_root_uri = content_url( $theme_root );
+                else
+                        $theme_root_uri = content_url( 'themes' );
+        } else {
</ins><span class="cx">                 $theme_root_uri = content_url( 'themes' );
</span><ins>+        }
</ins><span class="cx"> 
</span><span class="cx">         return apply_filters( 'theme_root_uri', $theme_root_uri, get_option('siteurl'), $stylesheet_or_template );
</span><span class="cx"> }
</span><span class="cx"> 
</span><span class="cx"> /**
</span><ins>+ * Get the raw theme root relative to the content directory with no filters applied.
+ *
+ * @since 3.1.0
+ *
+ * @param string $stylesheet_or_template The stylesheet or template name of the theme
+ * @return string Theme root
+ */
+function get_raw_theme_root( $stylesheet_or_template ) {
+        global $wp_theme_directories;
+
+        if ( count($wp_theme_directories &lt;= 1) )
+                return '/themes';
+
+        $theme_root = false;
+
+        // If requesting the root for the current theme, consult options to avoid calling get_theme_roots()
+        if ( get_option('stylesheet') == $stylesheet_or_template )
+                $theme_root = get_option('stylesheet_root');
+        elseif ( get_option('template') == $stylesheet_or_template )
+                $theme_root = get_option('template_root');
+
+        if ( empty($theme_root) ) {
+                $theme_roots = get_theme_roots();
+                if ( !empty($theme_roots[$stylesheet_or_template]) )
+                        $theme_root = $theme_roots[$stylesheet_or_template];
+        }
+
+        return $theme_root;
+}
+
+/**
</ins><span class="cx">  * Retrieve path to a template
</span><span class="cx">  *
</span><span class="cx">  * Used to quickly retrieve the path of a template without including the file
</span><span class="lines">@@ -1213,8 +1249,14 @@
</span><span class="cx">  * @param string $stylesheet Stylesheet name.
</span><span class="cx">  */
</span><span class="cx"> function switch_theme($template, $stylesheet) {
</span><ins>+        global $wp_theme_directories;
+
</ins><span class="cx">         update_option('template', $template);
</span><span class="cx">         update_option('stylesheet', $stylesheet);
</span><ins>+        if ( count($wp_theme_directories) &gt; 1 ) {
+                update_option('template_root', get_raw_theme_root($template));
+                update_option('stylesheet_root', get_raw_theme_root($stylesheet));
+        }
</ins><span class="cx">         delete_option('current_theme');
</span><span class="cx">         $theme = get_current_theme();
</span><span class="cx">         do_action('switch_theme', $theme);
</span></span></pre>
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