Add post_class() template function for emitting standard classes for post div. see #7457

git-svn-id: http://svn.automattic.com/wordpress/trunk@8638 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-content/themes/classic/index.php

@@ -6,7 +6,7 @@ get_header();
 
 <?php the_date('','<h2>','</h2>'); ?>
 
-<div class="post<?php sticky_class(); ?>" id="post-<?php the_ID(); ?>">
+<div <?php post_class() ?> id="post-<?php the_ID(); ?>">
 	 <h3 class="storytitle"><a href="<?php the_permalink() ?>" rel="bookmark"><?php the_title(); ?></a></h3>
 	<div class="meta"><?php _e("Filed under:"); ?> <?php the_category(',') ?> &#8212; <?php the_tags(__('Tags: '), ', ', ' &#8212; '); ?> <?php the_author() ?> @ <?php the_time() ?> <?php edit_post_link(__('Edit This')); ?></div>
 

wp-content/themes/default/index.php

@@ -6,7 +6,7 @@
 
 		<?php while (have_posts()) : the_post(); ?>
 
-			<div class="post<?php sticky_class(); ?>" id="post-<?php the_ID(); ?>">
+			<div <?php post_class() ?> id="post-<?php the_ID(); ?>">
 				<h2><a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></h2>
 				<small><?php the_time('F jS, Y') ?> <!-- by <?php the_author() ?> --></small>
 

wp-includes/post-template.php

@@ -160,6 +160,33 @@ function has_excerpt( $id = 0 ) {
 	return ( !empty( $post->post_excerpt ) );
 }
 
+/**
+ * Echo the classes for the post div
+ *
+ * {@internal Missing Long Description}}
+ *
+ * @package WordPress
+ * @subpackage Post
+ * @since 2.7
+ *
+ @ param string $class One or more classes to add to the class list
+ * @param int $post_id An optional post ID
+ */
+function post_class( $class = '', $post_id = null ) {
+
+	$classes = 'post';
+
+	if ( is_sticky($post_id) )
+		$classes .= ' sticky';
+
+	if ( !empty($class) )
+		$classes .= ' ' . $class;
+
+	$classes = apply_filters('post_class', $classes, $class, $post_id);
+
+	echo 'class="' . $classes . '"';
+}
+
 /**
  * Echo "sticky" CSS class if a post is sticky
  *