Support/Comments for sitemap

<?php
/*
==================================================
	sitemap
==================================================

Outputs a machine readable site map for search
engines and robots. Supports the following
formats:

- Sitemap Protocol used by Google Sitemaps
  (http://www.google.com/webmasters/sitemaps/)

- URL list in text format
  (e.g. Yahoo! submission)

Author: Grzegorz Adamiak [grad]
Version: 1.0.3 @ 2007-04-25
License: LGPL
MODx: 0.9.2.1

History:
# 1.0.3
- NC added ability to specify the XSL URL - you don't always need one and it 
  seems to create a lot of support confusion!
  It is now a parameter (&xsl=``) which can take either an alias or a doc ID
- Modifications suggested by forum users Grad and Picachu incorporated
  (http://modxcms.com/forums/index.php/topic,5754.60.html)
# 1.0.2
- Reworked fetching of template variable value to
  get INHERITED value.
# 1.0.1
- Reworked fetching of template variable value,
  now it gets computed value instead of nominal;
  however, still not the inherited value.
# 1.0
- First public release.

TODO:
- provide output for ROR
--------------------------------------------------
*/

/* Parameters
----------------------------------------------- */

# $startid [ int ]
# Id of the 'root' document from which the sitemap
# starts.
# Default: 0

$startid = (isset($startid)) ? $startid : 0;

# $format [ sp | txt | ror ]
# Which format of sitemap to use:
# - sp <- Sitemap Protocol used by Google
# - txt <- text file with list of URLs
# TODO - ror <- Resource Of Resources
# Default: sp

$format = (isset($format) && ($format != 'ror')) ? $format : 'sp';

# $priority [ str ]
# Name of TV which sets the relative priority of
# the document. If there is no such TV, this
# parameter will not be used.
# Default: sitemap_priority

$priority = (isset($priority)) ? $priority : 'sitemap_priority';

# $changefreq [ str ]
# Name of TV which sets the change frequency. If
# there is no such TV this parameter will not be
# used.
# Default: sitemap_changefreq

$changefreq = (isset($changefreq)) ? $changefreq : 'sitemap_changefreq';

# $excludeTemplates [ str ]
# Documents based on which templates should not be
# included in the sitemap. Comma separated list
# with names of templates.
# Default: empty

$excludeTemplates = (isset($excludeTemplates)) ? $excludeTemplates : array();

# $excludeTV [ str ]
# Name of TV (boolean type) which sets document
# exclusion form sitemap. If there is no such TV
# this parameter will not be used.
# Default: 'sitemap_exclude'

$excludeTV = (isset($excludeTV)) ? $excludeTV : 'sitemap_exclude';

# $xsl [ str ] 
# URL to the XSL style sheet
# or
# $xsl [ int ]
# doc ID of the XSL style sheet

$xsl = (isset($xsl)) ? $xsl : '';
if (is_numeric($xsl)) { $xsl = $modx->makeUrl($xsl); }


/* End parameters
----------------------------------------------- */

# get list of documents
# ---------------------------------------------
$docs = getDocs($modx,$startid,$priority,$changefreq,$excludeTV);

# filter out documents by template or TV
# ---------------------------------------------
// get all templates
$select = $modx->db->select("id, templatename", $modx->getFullTableName('site_templates'));
while ($query = $modx->db->getRow($select))
{
	$allTemplates[$query['id']] = $query['templatename'];
}

// get templates to exclude
if (!empty ($excludeTemplates))
{
	$excludeTemplates = explode(",", $excludeTemplates);
	// trim template names and remove empty ones (just in case)
	foreach ($excludeTemplates as $template)
	{
		if (trim($template))
			$excludeTemplates[] = trim($template);
	} // end foreach
}

// filter out documents
foreach ($docs as $doc)
{
	if (!in_array($doc['template'], array_flip(array_intersect($allTemplates, $excludeTemplates))))
		if (!$doc[$excludeTV] && $doc['published'] && $doc['template']!=0 )
			$output[] = $doc;
}
$docs = $output;
unset ($output, $allTemplates, $excludeTemplates);

# build sitemap in specified format
# ---------------------------------------------

switch ($format)
{
	case 'txt': // plain text list of URLs

		foreach ($docs as $doc)
		{
			$url = '[(site_url)][~'.$doc['id'].'~]';

			$output .= $url."\n";
		} // end foreach
		break;

	case 'ror': // TODO
	default: // Sitemap Protocol

		// Modified by NC
		$output = '<?xml version="1.0" encoding="UTF-8"?>'."\n";
		if ($xsl != '') {
			$output .='<?xml-stylesheet type="text/xsl" href="'.$xsl.'"?>'."\n";
		}
		$output .='<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd" xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'."\n";
		// End modified by NC
		
		foreach ($docs as $doc)
		{
			$url = '[(site_url)][~'.$doc['id'].'~]';
			$date = $doc['editedon'];
			$date = date("Y-m-d", $date);
			$docPriority = ($doc[$priority]) ? $doc[$priority] : 0; // false if TV doesn't exist
			$docChangefreq = ($doc[$changefreq]) ? $doc[$changefreq] : 0; // false if TV doesn't exist

			$output .= "\t".'<url>'."\n";
			$output .= "\t\t".'<loc>'.$url.'</loc>'."\n";
			$output .= "\t\t".'<lastmod>'.$date.'</lastmod>'."\n";
			$output .= ($docPriority) ? ("\t\t".'<priority>'.$docPriority.'</priority>'."\n") : ''; // don't output anything if TV doesn't exist
			$output .= ($docChangefreq) ? ("\t\t".'<changefreq>'.$docChangefreq.'</changefreq>'."\n") : ''; // don't output anything if TV doesn't exist
			$output .= "\t".'</url>'."\n";
		} // end foreach
		$output .= '</urlset>';

} // end switch

return $output;

# functions
# ---------------------------------------------

# gets (inherited) value of template variable
function getTV($modx,$docid,$doctv)
{
/* apparently in 0.9.2.1 the getTemplateVarOutput function doesn't work as expected and doesn't return INHERITED value; this is probably to be fixed for next release; see http://modxcms.com/bugs/task/464
	$output = $modx->getTemplateVarOutput($tv,$docid);
	return $output[$tv];
*/
	
	while ($pid = $modx->getDocument($docid,'parent'))
	{
		$tv = $modx->getTemplateVar($doctv,'*',$docid);
		if (($tv['value'] && substr($tv['value'],0,8) != '@INHERIT') or !$tv['value']) // tv default value is overriden (including empty)
		{
			$output = $tv['value'];
			break;
		}
		else // there is no parent with default value overriden 
		{
			$output = trim(substr($tv['value'],8));
		}
		$docid = $pid['parent']; // move up one document in document tree
	} // end while
	
	return $output;
}

# gets list of published documents with properties
function getDocs($modx,$startid,$priority,$changefreq,$excludeTV)
{
	// get children documents
	$docs = $modx->getAllChildren($startid,'menuindex','asc','id,editedon,template,published'); 
	// add sub-children to the list
	foreach ($docs as $key => $doc)
	{
		$id = $doc['id'];
		$docs[$key][$priority] = getTV($modx,$id,$priority); // add priority property
		$docs[$key][$changefreq] = getTV($modx,$id,$changefreq); // add changefreq property
		$docs[$key][$excludeTV] = getTV($modx,$id,$excludeTV); // add excludeTV property
		if ($modx->getActiveChildren($id))
			$docs = array_merge($docs, getDocs($modx,$id,$priority,$changefreq,$excludeTV));
	} // end foreach
	return $docs;
}
?>

		if ( !$doc[$excludeTV] && $doc['published'] && $doc['template']!=0 && $doc['searchable'])

	$docs = $modx->getAllChildren($startid,'menuindex','asc','id,editedon,template,published,searchable');