Issue #2416897 by Dave Reid: Allow disabling output of lastmod, changefreq,...

Issue #2416897 by Dave Reid: Allow disabling output of lastmod, changefreq, and priority in <loc> elements.

xmlsitemap.admin.inc

@@ -354,6 +354,16 @@ function xmlsitemap_settings_form($form, &$form_state) {
     '#default_value' => variable_get('xmlsitemap_disable_cron_regeneration', 0),
     '#description' => t('This can be disabled if other methods are being used to generate the sitemap files, like <em>drush xmlsitemap-regenerate</em>.'),
   );
+  $form['advanced']['xmlsitemap_output_elements'] = array(
+    '#type' => 'checkboxes',
+    '#title' => t('Enable or disable the individual @loc elements from output', array('@loc' => '<loc>')),
+    '#options' => array(
+      'lastmod' => t('Last modification date: @lastmod', array('@lastmod' => '<lastmod>')),
+      'changefreq' => t('Change frequency: @changfreq', array('@changfreq' => '<changefreq>')),
+      'priority' => t('Priority: @priority', array('@priority' => '<priority>')),
+    ),
+    '#default_value' => drupal_map_assoc(variable_get('xmlsitemap_output_elements', array('lastmod', 'changefreq', 'priority'))),
+  );
 
   $form['xmlsitemap_settings'] = array(
     '#type' => 'vertical_tabs',

xmlsitemap.generate.inc

@@ -154,6 +154,7 @@ function xmlsitemap_generate_page(stdClass $sitemap, $page) {
 }
 
 function xmlsitemap_generate_chunk(stdClass $sitemap, XMLSitemapWriter $writer, $chunk) {
+  $output_elements = drupal_map_assoc(variable_get('xmlsitemap_output_elements', array('lastmod', 'changefreq', 'priority')));
   $lastmod_format = variable_get('xmlsitemap_lastmod_format', XMLSITEMAP_LASTMOD_MEDIUM);
 
   $url_options = $sitemap->uri['options'];
@@ -209,17 +210,19 @@ function xmlsitemap_generate_chunk(stdClass $sitemap, XMLSitemapWriter $writer,
     $element = array();
     $element['loc'] = $link_url;
     if ($link['lastmod']) {
-      $element['lastmod'] = gmdate($lastmod_format, $link['lastmod']);
+      if (!empty($output_elements['lastmod'])) {
+        $element['lastmod'] = gmdate($lastmod_format, $link['lastmod']);
+      }
       // If the link has a lastmod value, update the changefreq so that links
       // with a short changefreq but updated two years ago show decay.
       // We use abs() here just incase items were created on this same cron run
       // because lastmod would be greater than REQUEST_TIME.
       $link['changefreq'] = (abs(REQUEST_TIME - $link['lastmod']) + $link['changefreq']) / 2;
     }
-    if ($link['changefreq']) {
+    if (!empty($output_elements['changefreq']) && $link['changefreq']) {
       $element['changefreq'] = xmlsitemap_get_changefreq($link['changefreq']);
     }
-    if (isset($link['priority']) && $link['priority'] != 0.5) {
+    if (!empty($output_elements['priority']) && isset($link['priority']) && $link['priority'] != 0.5) {
       // Don't output the priority value for links that have 0.5 priority. This
       // is the default 'assumed' value if priority is not included as per the
       // sitemaps.org specification.

xmlsitemap.module

@@ -297,6 +297,7 @@ function xmlsitemap_variables() {
     'xmlsitemap_lastmod_format' => XMLSITEMAP_LASTMOD_MEDIUM,
     'xmlsitemap_gz' => FALSE,
     'xmlsitemap_disable_cron_regeneration' => 0,
+    'xmlsitemap_output_elements' => array('lastmod', 'changefreq', 'priority'),
     // Removed variables are set to NULL so they can still be deleted.
     'xmlsitemap_regenerate_last' => NULL,
     'xmlsitemap_custom_links' => NULL,