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<title>[13635] trunk: wp_get_shortlink() and pluggable shortlink generation.</title>
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<div id="msg">
<dl>
<dt>Revision</dt> <dd><a href="http://trac.wordpress.org/changeset/13635">13635</a></dd>
<dt>Author</dt> <dd>ryan</dd>
<dt>Date</dt> <dd>2010-03-09 19:36:38 +0000 (Tue, 09 Mar 2010)</dd>
</dl>
<h3>Log Message</h3>
<pre>wp_get_shortlink() and pluggable shortlink generation. fixes <a href="http://trac.wordpress.org/ticket/10640">#10640</a></pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpadmineditformadvancedphp">trunk/wp-admin/edit-form-advanced.php</a></li>
<li><a href="#trunkwpincludesdefaultfiltersphp">trunk/wp-includes/default-filters.php</a></li>
<li><a href="#trunkwpincludeslinktemplatephp">trunk/wp-includes/link-template.php</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkwpadmineditformadvancedphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-admin/edit-form-advanced.php (13634 => 13635)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-admin/edit-form-advanced.php 2010-03-09 19:10:07 UTC (rev 13634)
+++ trunk/wp-admin/edit-form-advanced.php 2010-03-09 19:36:38 UTC (rev 13635)
</span><span class="lines">@@ -192,6 +192,10 @@
</span><span class="cx"> <div class="inside">
</span><span class="cx"> <?php
</span><span class="cx"> $sample_permalink_html = get_sample_permalink_html($post->ID);
</span><ins>+$shortlink = wp_get_shortlink($post->ID, 'post');
+if ( !empty($shortlink) )
+ $sample_permalink_html .= '<input id="shortlink" type="hidden" value="' . esc_attr($shortlink) . '" /><a href="#" class="button" onclick="prompt(&#39;URL:&#39;, jQuery(\'#shortlink\').val()); return false;">' . __('Get Shortlink') . '</a>';
+
</ins><span class="cx"> if ( !( 'pending' == $post->post_status && !current_user_can( $post_type_object->publish_cap ) ) ) { ?>
</span><span class="cx"> <div id="edit-slug-box">
</span><span class="cx"> <?php
</span></span></pre></div>
<a id="trunkwpincludesdefaultfiltersphp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/default-filters.php (13634 => 13635)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/default-filters.php 2010-03-09 19:10:07 UTC (rev 13634)
+++ trunk/wp-includes/default-filters.php 2010-03-09 19:36:38 UTC (rev 13635)
</span><span class="lines">@@ -191,6 +191,8 @@
</span><span class="cx"> add_action( 'wp_head', 'wp_generator' );
</span><span class="cx"> add_action( 'wp_head', 'rel_canonical' );
</span><span class="cx"> add_action( 'wp_footer', 'wp_print_footer_scripts' );
</span><ins>+add_action( 'wp_head', 'wp_shortlink_wp_head' );
+add_action( 'wp', 'wp_shortlink_header' );
</ins><span class="cx">
</span><span class="cx"> // Feed Generator Tags
</span><span class="cx"> foreach ( array( 'rss2_head', 'commentsrss2_head', 'rss_head', 'rdf_header', 'atom_head', 'comments_atom_head', 'opml_head', 'app_head' ) as $action ) {
</span></span></pre></div>
<a id="trunkwpincludeslinktemplatephp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/link-template.php (13634 => 13635)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/link-template.php 2010-03-09 19:10:07 UTC (rev 13634)
+++ trunk/wp-includes/link-template.php 2010-03-09 19:36:38 UTC (rev 13635)
</span><span class="lines">@@ -2050,4 +2050,83 @@
</span><span class="cx"> add_action('wp_head', '_wp_ajaxurl', 1);
</span><span class="cx"> }
</span><span class="cx">
</span><ins>+/**
+ * Return a shortlink for a post, page, attachment, or blog.
+ *
+ * Shortlinks are not supported by default. A plugin is required to get shortlink support.
+ * This function exists to provide a shortlink tag that all themes and plugins can target. A plugin must hook in to
+ * provide the actual shortlinks. Plugins can short circuit this function via the pre_get_shortlink filter or filter the output
+ * via the get_shortlink filter.
+ *
+ * @since 3.0.0.
+ *
+ * @param int $id A post or blog id. Default is 0, which means the current post or blog.
+ * @param string $contex Whether the id is a 'blog' id, 'post' id, or 'media' id. If 'post', the post_type of the post is consulted. If 'query', the current query is consulted to determine the id and context. Default is 'post'.
+ * @param bool $allow_slugs Whether to allow post slugs in the shortlink. It is up to the plugin how and whether to honor this.
+ * @return string A shortlink or an empty string if no shortlink exists for the requested resource or if shortlinks are not enabled.
+ */
+function wp_get_shortlink($id = 0, $context = 'post', $allow_slugs = true) {
+ // Allow plugins to short-circuit this function.
+ $shortlink = apply_filters('pre_get_shortlink', false, $id, $context, $allow_slugs);
+ if ( false !== $shortlink )
+ return $shortlink;
+
+ global $wp_query;
+ $post_id = 0;
+ if ( 'query' == $context && is_single() )
+ $post_id = $wp_query->get_queried_object_id();
+ elseif ( 'post' == $context )
+ $post_id = $id;
+
+ $shortlink = '';
+
+ // Return p= link for posts.
+ if ( !empty($post_id) ) {
+ $post = get_post($post_id);
+ if ( isset($post->post_type) && 'post' == $post->post_type )
+ $shortlink = home_url('?p=' . $post->ID);
+ }
+
+ return apply_filters('get_shortlink', $shortlink, $id, $context, $allow_slugs);
+}
+
+/**
+ * Inject rel=sortlink into head if a shortlink is defined for the current page.
+ *
+ * Attached to the wp_head action.
+ *
+ * @since 3.0.0
+ *
+ * @uses wp_get_shortlink()
+ */
+function wp_shortlink_wp_head() {
+ $shortlink = wp_get_shortlink(0, 'query');
+
+ if ( empty($shortlink) )
+ return;
+
+ echo '<link rel="shortlink" href="' . $shortlink . '" />';
+}
+
+/**
+ * Send a Link: rel=shortlink header if a shortlink is defined for the current page.
+ *
+ * Attached to the wp action.
+ *
+ * @since 3.0.0
+ *
+ * @uses wp_get_shortlink()
+ */
+function wp_shortlink_header() {
+ if ( headers_sent() )
+ return;
+
+ $shortlink = wp_get_shortlink(0, 'query');
+
+ if ( empty($shortlink) )
+ return;
+
+ header('Link: <' . $shortlink . '>; rel=shortlink');
+}
+
</ins><span class="cx"> ?>
</span></span></pre>
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