Create a more tag when it doesn't exist in a Wordpress Twenty Eleven Theme

changes_to_functions.php

<?PHP
//functions that need to be in the functions.php 
//for this to work

//more tag detection

function has_more() 
{
 global $post;
 if ( empty( $post ) ) return;
 
    if ($pos=strpos($post->post_content, '<!--more-->')) {
        return true;
    } else {
        return false;
    }
}

function more_posistion() 
{
    if ($pos=strpos($post->post_content, '<!--more-->')) {
        return $pos;
    }
}

///limit content length
//http://www.fusedthought.com/archives/wordpress-custom-content-length-code-snippet
function limit_content($content_length = 150, $allowtags = true, $allowedtags = '') {
	global $post;
	$content = $post->post_content;
	$content = apply_filters('the_content', $content);
	if (!$allowtags){
		$allowedtags .= '<style>';
		$content = strip_tags($content, $allowedtags);
	}
	$content = str_replace(']]>', ']]&gt;', $content);
	$wordarray = explode(' ', $content, $content_length + 1);
	if(count($wordarray) > $content_length) :
		array_pop($wordarray);
		array_push($wordarray, '...');
		$content = implode(' ', $wordarray);
		$content .= "</p>";
		$content .= twentyeleven_continue_reading_link();
	endif;

	echo $content;
}


?>

content-index_excerpt.php

//content index is a copy of content-images.php from the twenty-eleven theme
//I changed the section referencing the content

<div class="entry-content">
  <?php if (has_more()) {
       the_content( __( 'Continue reading <span class="meta-nav">&rarr;</span>', 'twentyeleven' ) ); 
  } else { 
       $my_content = limit_content();
       echo $my_content;
  }?>
  <?php wp_link_pages( array( 'before' => '<div class="page-link"><span>' . __( 'Pages:', 'twentyeleven' ) . '</span>', 'after' => '</div>' ) ); ?>
</div><!-- .entry-content -->

new_showcase_call.php

<?PHP
//what is now
global $more;
$more = 0;

$format = get_post_format( $post_id );

if ( ! $format ) {
     get_template_part( 'content', 'index' );
} else {
     get_template_part( 'content', get_post_format() );
}
?>

old_showcase_call.php

<?PHP
//what it used to be
global $more;
$more = 0;
get_template_part( 'content', get_post_format() );

?>