Implemented the SqlBuild command

Command/SqlBuildCommand.php

@@ -0,0 +1,57 @@
+<?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 Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * @author Kévin Gomez <contact@kevingomez.fr>
+ */
+class SqlBuildCommand extends AbstractCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        parent::configure();
+
+        $this
+            ->setName('propel:sql:build')
+            ->setDescription('Build SQL files')
+
+            ->addOption('connection', null, InputOption::VALUE_IS_ARRAY | InputOption::VALUE_OPTIONAL, 'Connection to use. Example: default, bookstore')
+            // @todo add the other arguments/options handled by the command
+        ;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function createSubCommandInstance()
+    {
+        return new \Propel\Generator\Command\SqlBuildCommand();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getSubCommandArguments(InputInterface $input)
+    {
+        return array(
+            '--output-dir'  => $this->getCacheDir(),
+            '--connection'  => $this->getConnections($input->getOption('connection')),
+        );
+    }
+}