A tag cloud section for groups

diff --git a/lib/grouptagcloudsection.php b/lib/grouptagcloudsection.php
new file mode 100644 (file)
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+++ b/lib/grouptagcloudsection.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * Laconica, the distributed open-source microblogging tool
+ *
+ * Personal tag cloud section
+ *
+ * PHP version 5
+ *
+ * LICENCE: This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @category  Widget
+ * @package   Laconica
+ * @author    Evan Prodromou <evan@controlyourself.ca>
+ * @copyright 2009 Control Yourself, Inc.
+ * @license   http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link      http://laconi.ca/
+ */
+
+if (!defined('LACONICA')) {
+    exit(1);
+}
+
+/**
+ * Personal tag cloud section
+ *
+ * @category Widget
+ * @package  Laconica
+ * @author   Evan Prodromou <evan@controlyourself.ca>
+ * @license  http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
+ * @link     http://laconi.ca/
+ */
+
+class GroupTagCloudSection extends TagCloudSection
+{
+    var $group = null;
+
+    function __construct($out=null, $group=null)
+    {
+        parent::__construct($out);
+        $this->group = $group;
+    }
+
+    function title()
+    {
+        return sprintf(_('Tags in %s group\'s notices'), $this->group->nickname);
+    }
+
+    function getTags()
+    {
+        $qry = 'SELECT notice_tag.tag, '.
+          'sum(exp(-(now() - notice_tag.created)/%s)) as weight ' .
+          'FROM notice_tag JOIN notice ' .
+          'ON notice_tag.notice_id = notice.id ' .
+          'JOIN group_inbox on group_inbox.notice_id = notice.id ' .
+          'WHERE group_inbox.group_id = %d ' .
+          'GROUP BY notice_tag.tag ' .
+          'ORDER BY weight DESC ';
+
+        $limit = TAGS_PER_SECTION;
+        $offset = 0;
+
+        if (common_config('db','type') == 'pgsql') {
+            $qry .= ' LIMIT ' . $limit . ' OFFSET ' . $offset;
+        } else {
+            $qry .= ' LIMIT ' . $offset . ', ' . $limit;
+        }
+
+        $tag = Memcached_DataObject::cachedQuery('Notice_tag',
+                                                 sprintf($qry,
+                                                         common_config('tag', 'dropoff'),
+                                                         $this->group->id),
+                                                 3600);
+        return $tag;
+    }
+
+}