diff -r 9ba15af20acc -r e48c2e503945 Command/PurgeTagsCommand.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Command/PurgeTagsCommand.php	Fri Nov 18 17:42:18 2011 +0100
@@ -0,0 +1,100 @@
+<?php
+/*
+ * This file is part of the WikiTagBundle package.
+ *
+ * (c) IRI <http://www.iri.centrepompidou.fr/>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace IRI\Bundle\WikiTagBundle\Command;
+
+use Doctrine\ORM\QueryBuilder;
+use Doctrine\ORM\Query\ResultSetMapping;
+use Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+class PurgeTagsCommand extends ContainerAwareCommand
+{
+    protected function configure()
+    {
+        parent::configure();
+    
+        $this
+            ->setName('wikitag:purge-tags')
+            ->setDescription('Purge tags')
+            ->addOption("list","l",InputOption::VALUE_NONE, "List tags tp remove")
+            ->addOption("force","f",InputOption::VALUE_NONE, "Force remove tags");
+    }
+    
+    
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $force = $input->getOption('force');
+        $list = $input->getOption('list');
+            
+        //get tags with no documents
+        $doctrine = $this->getContainer()->get('doctrine');
+        
+        $qb = $doctrine->getEntityManager()->createQueryBuilder();
+        $qb->select('t');
+        $qb->from('WikiTagBundle:Tag','t');
+        $qb->leftJoin('t.documents', 'dt', 'WITH', 't = dt.tag');
+        $qb->addGroupBy('t.id');
+        $qb->having($qb->expr()->eq($qb->expr()->count('dt.id'),':count'));
+        $qb->setParameter("count", 0);
+
+
+        $rsm = new ResultSetMapping();
+        $rsm->addScalarResult("C","C");
+        $count_query = $doctrine->getEntityManager()->createNativeQuery("SELECT COUNT(*) AS C FROM (".$qb->getQuery()->getSQL().") AS T", $rsm);
+        $count_query->setParameter(1, 0);
+        
+        $count = $count_query->getSingleScalarResult();
+        
+        $output->writeln("<comment>$count tag(s) to delete.</comment>\n");
+        
+        if($list)
+        {
+            $query = $qb->getQuery();
+            $result = $query->getResult();
+           
+            $i = 1;
+            foreach($result as $tag)
+            {
+                $output->writeln(strval($i++)."- ".$tag->getLabel());
+            }
+            $output->writeln("");
+        }
+        else
+        {
+            if(! $force && $input->isInteractive())
+            {
+                $dialog = $this->getHelper('dialog');
+                if (!$dialog->askConfirmation($output, '<question>Confirm deletion? (y/N) : </question>', false)) {
+                    return;
+                }
+            }
+            
+            
+            $id_delete = array();
+            foreach($qb->getQuery()->getResult() as $tag)
+            {
+                $id_delete[] = $tag->getId();
+            }
+            
+            $delete_qb = $doctrine->getEntityManager()->createQueryBuilder();
+            $delete_qb->delete('WikiTagBundle:Tag','tag');
+            $delete_qb->where($delete_qb->expr()->in('tag.id', $id_delete));
+                        
+            $result = $delete_qb->getQuery()->getResult();
+            
+            $output->writeln("Tag deleted : $result \n");
+            
+        }
+        
+    }
+}
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