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<title>[30099] trunk/src/wp-content/themes/twentyfifteen: Twenty Fifteen: avoid errors by preventing Twenty Fifteen from being activated in old versions of WordPress</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/30099">30099</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/30099","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>iandstewart</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2014-10-29 22:13:14 +0000 (Wed, 29 Oct 2014)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Twenty Fifteen: avoid errors by preventing Twenty Fifteen from being activated in old versions of WordPress
Props iamtakashi, fixes <a href="https://core.trac.wordpress.org/ticket/30137">#30137</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpcontentthemestwentyfifteenfunctionsphp">trunk/src/wp-content/themes/twentyfifteen/functions.php</a></li>
</ul>
<h3>Added Paths</h3>
<ul>
<li><a href="#trunksrcwpcontentthemestwentyfifteenincbackcompatphp">trunk/src/wp-content/themes/twentyfifteen/inc/back-compat.php</a></li>
</ul>
</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpcontentthemestwentyfifteenfunctionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-content/themes/twentyfifteen/functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-content/themes/twentyfifteen/functions.php 2014-10-29 21:57:07 UTC (rev 30098)
+++ trunk/src/wp-content/themes/twentyfifteen/functions.php 2014-10-29 22:13:14 UTC (rev 30099)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -34,6 +34,13 @@
</span><span class="cx" style="display: block; padding: 0 10px"> $content_width = 660;
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+/**
+ * Twenty Fifteen only works in WordPress 4.1 or later.
+ */
+if ( version_compare( $GLOBALS['wp_version'], '4.1', '<' ) ) {
+ require get_template_directory() . '/inc/back-compat.php';
+}
+
</ins><span class="cx" style="display: block; padding: 0 10px"> if ( ! function_exists( 'twentyfifteen_setup' ) ) :
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><span class="cx" style="display: block; padding: 0 10px"> * Sets up theme defaults and registers support for various WordPress features.
</span></span></pre></div>
<a id="trunksrcwpcontentthemestwentyfifteenincbackcompatphp"></a>
<div class="addfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Added: trunk/src/wp-content/themes/twentyfifteen/inc/back-compat.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-content/themes/twentyfifteen/inc/back-compat.php (rev 0)
+++ trunk/src/wp-content/themes/twentyfifteen/inc/back-compat.php 2014-10-29 22:13:14 UTC (rev 30099)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -0,0 +1,63 @@
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+<?php
+/**
+ * Twenty Fifteen back compat functionality
+ *
+ * Prevents Twenty Fifteen from running on WordPress versions prior to 4.1,
+ * since this theme is not meant to be backward compatible beyond that
+ * and relies on many newer functions and markup changes introduced in 4.1.
+ *
+ * @package WordPress
+ * @subpackage Twenty_Fifteen
+ * @since Twenty Fifteen 1.0
+ */
+
+/**
+ * Prevent switching to Twenty Fifteen on old versions of WordPress.
+ *
+ * Switches to the default theme.
+ *
+ * @since Twenty Fifteen 1.0
+ */
+function twentyfifteen_switch_theme() {
+ switch_theme( WP_DEFAULT_THEME, WP_DEFAULT_THEME );
+ unset( $_GET['activated'] );
+ add_action( 'admin_notices', 'twentyfifteen_upgrade_notice' );
+}
+add_action( 'after_switch_theme', 'twentyfifteen_switch_theme' );
+
+/**
+ * Add message for unsuccessful theme switch.
+ *
+ * Prints an update nag after an unsuccessful attempt to switch to
+ * Twenty Fifteen on WordPress versions prior to 4.1.
+ *
+ * @since Twenty Fifteen 1.0
+ */
+function twentyfifteen_upgrade_notice() {
+ $message = sprintf( __( 'Twenty Fifteen requires at least WordPress version 4.1. You are running version %s. Please upgrade and try again.', 'twentyfifteen' ), $GLOBALS['wp_version'] );
+ printf( '<div class="error"><p>%s</p></div>', $message );
+}
+
+/**
+ * Prevent the Customizer from being loaded on WordPress versions prior to 4.1.
+ *
+ * @since Twenty Fifteen 1.0
+ */
+function twentyfifteen_customize() {
+ wp_die( sprintf( __( 'Twenty Fifteen requires at least WordPress version 4.1. You are running version %s. Please upgrade and try again.', 'twentyfifteen' ), $GLOBALS['wp_version'] ), '', array(
+ 'back_link' => true,
+ ) );
+}
+add_action( 'load-customize.php', 'twentyfifteen_customize' );
+
+/**
+ * Prevent the Theme Preview from being loaded on WordPress versions prior to 4.1.
+ *
+ * @since Twenty Fifteen 1.0
+ */
+function twentyfifteen_preview() {
+ if ( isset( $_GET['preview'] ) ) {
+ wp_die( sprintf( __( 'Twenty Fifteen requires at least WordPress version 4.1. You are running version %s. Please upgrade and try again.', 'twentyfifteen' ), $GLOBALS['wp_version'] ) );
+ }
+}
+add_action( 'template_redirect', 'twentyfifteen_preview' );
</ins><span class="cx" style="display: block; padding: 0 10px">\ No newline at end of file
</span></span></pre>
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