<?php 


/**
 * Implements hook_filter_info().
 */
function filter_path_alias_filter_info() {
  $filters['path_alias'] = array(
    'title' => t('Path Alias'),
    'description' => t('replace internal machine links with alias'),
    'process callback' => 'filter_path_alias_callback',
  );
  return $filters;
}


function filter_path_alias_callback($text, $filter, $format, $langcode, $cache, $cache_id){
	// dsm($text, 'text');
	// dsm($_SERVER, 'server');
	if (preg_match_all('/href="([^"]+)"/', $text, $matches_code)) {
		// dsm($matches_code, 'matches_code');
    foreach ($matches_code[1] as $i => $path) {
    	$old_path = $path;
    	$path = str_replace('http://', '', $path);
    	$path = str_replace($_SERVER['SERVER_NAME'], '', $path);
    	$path = preg_replace('/#.*$/', '', $path);
    	$path = preg_replace('/\?.*$/', '', $path);
    	$path = preg_replace('/^\//', '', $path);
    	// dsm($path, 'path');

    	if($path != ""){
    		$alias = drupal_get_path_alias($path, $langcode);
    		// dsm($alias, 'alias');
    		if($alias != $path){
	    		$path_aliased = str_replace($old_path, $alias, $matches_code[0][$i]);
	    		$text = str_replace($matches_code[0][$i], $path_aliased, $text);
    		}
    	}
	  }
	}


	return $text;
}