Implemented the DatabaseDrop command

Command/AbstractCommand.php

@@ -394,4 +394,22 @@ EOT;
 
         return implode(PHP_EOL, $lines);
     }
+
+    /**
+     * Extract the database name from a given DSN
+     *
+     * @param string $dsn A DSN
+     * @return string The database name extracted from the given DSN
+     */
+    protected function parseDbName($dsn)
+    {
+        preg_match('#dbname=([a-zA-Z0-9\_]+)#', $dsn, $matches);
+
+        if (isset($matches[1])) {
+            return $matches[1];
+        }
+
+        // e.g. SQLite
+        return null;
+    }
 }

Command/DatabaseDropCommand.php

@@ -0,0 +1,113 @@
+<?php
+
+/**
+ * This file is part of the PropelBundle package.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license    MIT License
+ */
+
+namespace Propel\PropelBundle\Command;
+
+use Propel\Runtime\Propel;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * DatabaseDropCommand class.
+ * Useful to drop a database.
+ *
+ * @author William DURAND
+ */
+class DatabaseDropCommand extends AbstractCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('propel:database:drop')
+            ->setDescription('Drop a given database or the default one.')
+            ->setHelp(<<<EOT
+The <info>propel:database:drop</info> command will drop your database.
+
+  <info>php app/console propel:database:drop</info>
+
+The <info>--force</info> parameter has to be used to actually drop the database.
+The <info>--connection</info> parameter allows you to change the connection to use.
+The default connection is the active connection (propel.dbal.default_connection).
+EOT
+            )
+
+            ->addOption('connection',   null, InputOption::VALUE_OPTIONAL, 'Connection to use. Example: default, bookstore')
+            ->addOption('force',        null, InputOption::VALUE_NONE, 'Set this parameter to execute this action.')
+        ;
+    }
+
+    /**
+     * @see Command
+     *
+     * @throws \InvalidArgumentException When the target directory does not exist
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        if (!$input->getOption('force')) {
+            $output->writeln('<error>You have to use the "--force" option to drop the database.</error>');
+            return;
+        }
+
+        if ('prod' === $this->getApplication()->getKernel()->getEnvironment()) {
+            $this->writeSection($output, 'WARNING: you are about to drop a database in production !', 'bg=red;fg=white');
+
+            if (false === $this->askConfirmation($output, 'Are you sure ? (y/n) ', false)) {
+                $output->writeln('Aborted, nice decision !');
+
+                return -2;
+            }
+        }
+
+        $connectionName = $input->getOption('connection') ?: $this->getContainer()->getParameter('propel.dbal.default_connection');
+        $config = $this->getConnectionData($connectionName);
+        $connection = Propel::getConnection($connectionName);
+        $dbName = $this->parseDbName($config['connection']['dsn']);
+
+        if (null === $dbName) {
+            return $output->writeln('<error>No database name found.</error>');
+        } else {
+            $query  = 'DROP DATABASE '. $dbName .';';
+        }
+
+        try {
+            $statement = $connection->prepare($query);
+            $statement->execute();
+
+            $output->writeln(sprintf('<info>Database <comment>%s</comment> has been dropped.</info>', $dbName));
+        } catch (\Exception $e) {
+            $this->writeSection($output, array(
+                '[Propel] Exception caught',
+                '',
+                $e->getMessage()
+            ), 'fg=white;bg=red');
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function createSubCommandInstance()
+    {
+        // useless here
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getSubCommandArguments(InputInterface $input)
+    {
+        // useless here
+    }
+}