getTagCloud: support filtering for taxonomy_id like in getPageTerms

[swbraun]

I couldn't find a way to group the clouded terms by tags or categories since the filering by taxonomy_id was not possible. Maybe I was missing something, but for now I changed the snipped myself.
I attach the diff below. It would be nice, if this could be incorporated.

[swbraun]

diff --git a/elements/snippets/getTagCloud.php b/elements/snippets/getTagCloud.php
index b85e61e..ca7c372 100644
--- a/elements/snippets/getTagCloud.php
+++ b/elements/snippets/getTagCloud.php
@@ -14,6 +14,7 @@
  * @param textfield $innerTpl Format the Inner Item of List
  * @param textfield $sort column: pagetitle, id, count
  * @param textfield $dir ASC | DESC default=DESC
+ * @param int $taxonomy_id limit terms to only this taxonomy 
  * @param numberfield $limit Limit the result, default to 10 : setting it to 0 will show all
  * @param combo-boolean $includeEmpty include all terms (disregard if it's assigned to certain page)
  *
@@ -40,6 +41,9 @@ $dir = $modx->getOption('dir',$scriptProperties, 'DESC');
 $outerTpl = $modx->getOption('outerTpl',$scriptProperties, '<ul>[[+content]]</ul>');
 $innerTpl = $modx->getOption('innerTpl',$scriptProperties, '<li><a href="[[~[[+id]]]]">[[+pagetitle]]</a> <strong>([[+count]])</strong></li>');

+$taxonomy_id = $modx->getOption('taxonomy_id',$scriptProperties,null);
+$and_where = (is_null($taxonomy_id)) ? '' : 'AND doc.parent = ' . $taxonomy_id;
+
 $content_table = $modx->getTableName('modResource');
 $pageterms_table = $modx->getTableName('PageTerm');
 if($includeEmpty == 1)
@@ -47,7 +51,7 @@ if($includeEmpty == 1)
        $sql = "SELECT doc.id as id, doc.pagetitle, count(terms.page_id) as count
                FROM $content_table doc
                LEFT JOIN $pageterms_table terms ON doc.id = terms.term_id
-               WHERE doc.class_key='Term'
+               WHERE doc.class_key='Term'  {$and_where}
                GROUP BY doc.id";
 }
 else
@@ -55,7 +59,7 @@ else
        $sql = "SELECT terms.term_id as id, doc.pagetitle, count(*) as count
                FROM $content_table doc
                JOIN $pageterms_table terms ON terms.term_id = doc.id
-               WHERE doc.class_key='Term'
+               WHERE doc.class_key='Term'  {$and_where}
                GROUP BY terms.term_id";
 }

@@ -72,4 +76,4 @@ if(count($results) == 0)
        $modx->log(\modX::LOG_LEVEL_DEBUG, "No results found",'','getTagCloud',__LINE__);
 }