Better Internal Link Search Add-On for out links

marctv-out-linker.php

<?php
/**
 * Plugin Name: MarcTV Out Linker
 * Description: Adds Links
 * Plugin URI:  https://marc.tv
 * Version:     0.0.1
 */

function marctv_out_shortscuts( $shortcuts ) {
	
	$lines = file(ABSPATH . '/out/redirects.txt', FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);

	foreach ($lines as $line_num => $line) {
		$outlink = explode(",", htmlspecialchars($line));


		$homeurl = home_url();

		$shortcuts[$outlink[0]] = array(
			'title'     => $outlink[0],
			'permalink' => $homeurl . '/out/' . $outlink[0],
		);
	};

	return $shortcuts;
}

add_filter( 'better_internal_link_search_shortcuts', 'marctv_out_shortscuts' );