Supplemental SearchWP search engine integration with Genesis, supports pagination

gistfile1.php

<?php

/* Template Name: Genesis and SearchWP integration with pagination */

function prefix_searchwp_form( $query ) {
	echo '<form class="searchwp-form" action="" method="get">';
	echo '<input type="text" id="searchwpquery" name="searchwpquery" value="' . esc_attr( $query ) . '" />';
	echo '<button type="submit">' . __( 'Search', 'text-domain' ) . '</button>';
	echo '</form>';
}

function mySearchEnginePostsPerPage() {
	return 3; // 10 posts per page
}
add_filter( 'searchwp_posts_per_page', 'mySearchEnginePostsPerPage' );


function prefix_do_search_loop() {

	global $wp_query, $post;

	// Return early if SearchWP is disabled.
	if ( ! class_exists( 'SearchWP' ) )
		return;

	$searchwpquery = isset( $_GET['searchwpquery'] ) ? sanitize_text_field( $_GET['searchwpquery'] ) : '';
	$searchwppage = get_query_var( 'paged' );
	if( empty( $searchwppage ) ) $searchwppage = 1;

	// Load the custom SearchWP form.
	prefix_searchwp_form( $searchwpquery );

	// Do nothing if no search has been performed.
	if ( empty( $searchwpquery ) )
		return;

	// Instantiate SearchWP.
	$engine = SearchWP::instance();

	// Set the supplemental search engine name.
	$supplementalSearchEngineName = 'supplemental';

	// perform the search
	$posts = $engine->search( $supplementalSearchEngineName, $searchwpquery, $searchwppage );

	// prep pagiation
	$original = array( 'max_num_pages' => $wp_query->max_num_pages, 'found_posts' => $wp_query->found_posts );
	$wp_query->max_num_pages = $engine->maxNumPages;
	$wp_query->found_posts = $engine->foundPosts;
	
	// trick subsequent function calls into thinking we're not on a page but in a loop
	$wp_query-> is_singular = $wp_query->is_single = $wp_query->is_page = false;

	// output our loop
	if( !empty( $posts ) )
	{
		foreach ( $posts as $post )
		{
			setup_postdata( $post );
			?>
				<p><?php the_title(); ?></p>
			<?php
		}

		// this action already fires automatically if we're NOT on page 1, but only for prev/next
		if( 'numeric' === genesis_get_option( 'posts_nav' ) || ( 'numeric' !== genesis_get_option( 'posts_nav' ) && $searchwppage < 2 ) )
			do_action( 'genesis_after_endwhile' );
	}

	$wp_query->max_num_pages = $original['max_num_pages'];
	$wp_query->found_posts = $original['found_posts'];

}

add_action( 'genesis_after_entry', 'prefix_do_search_loop' );

genesis();