#!/usr/bin/env php
<?php
/**
* Generate a delta (diff) between two fittings.
 *
* @returns a string, containing HTML code (safe to print as-is,
* delta() already does some escaping), or null if a diff could not be
* generated
 */
function delta($old, $new) {
	@include_once 'Horde/Autoloader/Default.php';
	if(!class_exists('Horde_Text_Diff')) return null;

	$oldt = \Osmium\Fit\export_to_markdown($old, false);
	$newt = \Osmium\Fit\export_to_markdown($new, false);

	$diff = new \Horde_Text_Diff('auto', array(explode("\n", $oldt), 
	                                           explode("\n", $newt)));
	$renderer = new \Horde_Text_Diff_Renderer_Inline();
	return $renderer->render($diff);
}