Sitemapper code improved and documentation added

Removed some calls to dbglog, improved the code performance and added
documentation for all functions and classes of the Sitemapper.

inc/Sitemapper.php

@@ -8,6 +8,11 @@
 
 if(!defined('DOKU_INC')) die('meh.');
 
+/**
+ * A class for building sitemaps and pinging search engines with the sitemap URL.
+ * 
+ * @author Michael Hamann
+ */
 class Sitemapper {
     /**
      * Builds a Google Sitemap of all public pages known to the indexer
@@ -15,16 +20,16 @@ class Sitemapper {
      * The map is placed in the cache directory named sitemap.xml.gz - This
      * file needs to be writable!
      *
+     * @author Michael Hamann
      * @author Andreas Gohr
      * @link   https://www.google.com/webmasters/sitemaps/docs/en/about.html
+     * @link   http://www.sitemaps.org/
      */
     public function generate(){
         global $conf;
-        dbglog('sitemapGenerate(): started');
-        if(!$conf['sitemap']) return false;
+        if($conf['sitemap'] < 1 || !is_numeric($conf['sitemap'])) return false;
 
         $sitemap = Sitemapper::getFilePath();
-        dbglog("runSitemapper(): using $sitemap");
 
         if(@file_exists($sitemap)){
             if(!is_writable($sitemap)) return false;
@@ -33,13 +38,15 @@ class Sitemapper {
         }
 
         if(@filesize($sitemap) &&
-           @filemtime($sitemap) > (time()-($conf['sitemap']*60*60*24))){
-            dbglog('runSitemapper(): Sitemap up to date');
+           @filemtime($sitemap) > (time()-($conf['sitemap']*86400))){ // 60*60*24=86400
+            dbglog('Sitemapper::generate(): Sitemap up to date'); // FIXME: only in debug mode
             return false;
         }
 
+        dbglog("Sitemapper::generate(): using $sitemap"); // FIXME: Only in debug mode
+
         $pages = idx_getIndex('page', '');
-        dbglog('runSitemapper(): creating sitemap using '.count($pages).' pages');
+        dbglog('Sitemapper::generate(): creating sitemap using '.count($pages).' pages');
         $items = array();
 
         // build the sitemap items
@@ -61,31 +68,49 @@ class Sitemapper {
         return $result;
     }
 
+    /**
+     * Builds the sitemap XML string from the given array auf SitemapItems.
+     * 
+     * @param $items array The SitemapItems that shall be included in the sitemap.
+     * @return string The sitemap XML.
+     * @author Michael Hamann
+     */
     private function getXML($items) {
         ob_start();
-        print '<?xml version="1.0" encoding="UTF-8"?>'.NL;
-        print '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'.NL;
+        echo '<?xml version="1.0" encoding="UTF-8"?>'.NL;
+        echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">'.NL;
         foreach ($items as $item) {
-            print $item->toXML();
+            echo $item->toXML();
         }
-        print '</urlset>'.NL;
+        echo '</urlset>'.NL;
         $result = ob_get_contents();
         ob_end_clean();
         return $result;
     }
 
-
+    /**
+     * Helper function for getting the path to the sitemap file.
+     * 
+     * @return The path to the sitemap file.
+     * @author Michael Hamann
+     */
     public function getFilePath() {
         global $conf;
 
         $sitemap = $conf['cachedir'].'/sitemap.xml';
-        if($conf['compression'] == 'bz2' || $conf['compression'] == 'gz'){
+        if($conf['compression'] === 'bz2' || $conf['compression'] === 'gz'){
             $sitemap .= '.gz';
         }
 
         return $sitemap;
     }
 
+    /**
+     * Pings search engines with the sitemap url. Plugins can add or remove 
+     * urls to ping using the SITEMAP_PING event.
+     * 
+     * @author Michael Hamann
+     */
     public function pingSearchEngines() {
         //ping search engines...
         $http = new DokuHTTPClient();
@@ -98,13 +123,16 @@ class Sitemapper {
             'microsoft' => 'http://www.bing.com/webmaster/ping.aspx?siteMap='.$encoded_sitemap_url,
         );
 
-        $event = new Doku_Event('SITEMAP_PING', $ping_urls);
+        $data = array('ping_urls' => $ping_urls,
+                            'encoded_sitemap_url' => $encoded_sitemap_url
+        );
+        $event = new Doku_Event('SITEMAP_PING', $data);
         if ($event->advise_before(true)) {
-            foreach ($ping_urls as $name => $url) {
-                dbglog("sitemapPingSearchEngines(): pinging $name");
+            foreach ($data['ping_urls'] as $name => $url) {
+                dbglog("Sitemapper::PingSearchEngines(): pinging $name");
                 $resp = $http->get($url);
-                if($http->error) dbglog("runSitemapper(): $http->error");
-                dbglog('runSitemapper(): '.preg_replace('/[\n\r]/',' ',strip_tags($resp)));
+                if($http->error) dbglog("Sitemapper:pingSearchengines(): $http->error");
+                dbglog('Sitemapper:pingSearchengines(): '.preg_replace('/[\n\r]/',' ',strip_tags($resp)));
             }
         }
         $event->advise_after();
@@ -113,12 +141,25 @@ class Sitemapper {
     }
 }
 
+/**
+ * An item of a sitemap.
+ * 
+ * @author Michael Hamann
+ */
 class SitemapItem {
     public $url;
     public $lastmod;
     public $changefreq;
     public $priority;
 
+    /**
+     * Create a new item.
+     * 
+     * @param $url string The url of the item
+     * @param $lastmod int Timestamp of the last modification
+     * @param $changefreq string How frequently the item is likely to change. Valid values: always, hourly, daily, weekly, monthly, yearly, never.
+     * @param $priority float|string The priority of the item relative to other URLs on your site. Valid values range from 0.0 to 1.0.
+     */
     public function __construct($url, $lastmod, $changefreq = null, $priority = null) {
         $this->url = $url;
         $this->lastmod = $lastmod;
@@ -126,6 +167,14 @@ class SitemapItem {
         $this->priority = $priority;
     }
 
+    /**
+     * Helper function for creating an item for a wikipage id.
+     * 
+     * @param $id string A wikipage id.
+     * @param $changefreq string How frequently the item is likely to change. Valid values: always, hourly, daily, weekly, monthly, yearly, never.
+     * @param $priority float|string The priority of the item relative to other URLs on your site. Valid values     range from 0.0 to 1.0.
+     * @return The sitemap item.
+     */
     public static function createFromID($id, $changefreq = null, $priority = null) {
         $id = trim($id);
         $date = @filemtime(wikiFN($id));
@@ -133,10 +182,15 @@ class SitemapItem {
         return new SitemapItem(wl($id, '', true), $date, $changefreq, $priority);
     }
 
+    /**
+     * Get the XML representation of the sitemap item.
+     * 
+     * @return The XML representation.
+     */
     public function toXML() {
-        $result = '  <url>'.NL;
-        $result .= '    <loc>'.hsc($this->url).'</loc>'.NL;
-        $result .= '    <lastmod>'.date_iso8601($this->lastmod).'</lastmod>'.NL;
+        $result = '  <url>'.NL
+                 .'    <loc>'.hsc($this->url).'</loc>'.NL
+                 .'    <lastmod>'.date_iso8601($this->lastmod).'</lastmod>'.NL;
         if ($this->changefreq !== NULL)
             $result .= '    <changefreq>'.hsc($this->changefreq).'</changefreq>'.NL;
         if ($this->priority !== NULL)