Site registration to prompt on single post pages WordPress

Ivaylo Draganov answers:

This is actually very simple to achieve. Here it is for the default theme (TwentyTen):

<?php
/**
* The Template for displaying all single posts.
*
* @package WordPress
* @subpackage Twenty_Ten
* @since Twenty Ten 1.0
*/

get_header(); ?>

<div id="container">
<div id="content" role="main">

<?php
// if user is not logged in
if ( !is_user_logged_in() ) {

// print a login form, that by default will redirect back to the current page
wp_login_form();

// if user is logged in, just go on as usual
} else {

/* Run the loop to output the post.
* If you want to overload this in a child theme then include a file
* called loop-single.php and that will be used instead.
*/
get_template_part( 'loop', 'single' );

}

?>

</div><!-- #content -->
</div><!-- #container -->

<?php get_sidebar(); ?>
<?php get_footer(); ?>


This is the file <em>single.php</em>. It may look somewhat different on other themes but the basics are the same and it could be easily adapted. See it in action on my testsite:
[[LINK href="http://test.druuf.com/wordpress/?p=1"]]http://test.druuf.com/wordpress/?p=1[[/LINK]]

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