SearchWP snippet to limit results to the current category page being viewed

gistfile1.php

<?php

function mySearchIncludeIds( $ids, $engine, $terms )
{
  // if we're viewing a category page and the SearchWP engine is the default engine
  if( is_category() && $engine == 'default' ) {
    
    $termID = get_queried_object_id(); // determine which category we're viewing
    
    // get the IDs of all the posts in this category
    $args = array( 'category' => $termID, 'fields' => 'ids' );
    $ids = get_posts( $args );
    
  }
  
  return $ids;
}
 
add_filter( 'searchwp_include', 'mySearchIncludeIds', 10, 3 );