How to write a query-function as a query-shortcode?

I ask this question as a follow-up to this one.

I have this query-function in functions.php but AAMOF I don’t want to change functions.php at all (besides for CPTs).

I’d like to print the same data directly from WP GUI via shortcode.

How should a functions.php query-function should be translated into a query-shortcode?

$posts = get_posts(array(
“post_type”=>”book_pages”,
“post_status”=>”publish”,
“posts_per_page”=>-1
));

if ($posts && count($posts)>0)
{
global $post;
foreach ($posts as $post)
{
setup_postdata($post);
the_title(); //prints out the title of this post
}
wp_reset_postdata();
}

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