Added new command to show all available installable versions

src/Symfony/Installer/AvailableVersionsCommand.php

@@ -0,0 +1,121 @@
+<?php
+
+/*
+ * This file is part of the Symfony Installer package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Installer;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Helper\Table;
+use Symfony\Component\Console\Helper\TableCell;
+use Symfony\Component\Console\Helper\TableSeparator;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * This command provides information about all installable versions of Symfony.
+ *
+ * @author Bertrand Zuchuat <bertrand.zuchuat@gmail.com>
+ */
+class AvailableVersionsCommand extends DownloadCommand
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('available-versions')
+            ->setDescription('Symfony Available Versions.')
+        ;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        parent::initialize($input, $output);
+
+        // Get the full list of Symfony versions
+        $client = $this->getGuzzleClient();
+        $symfonyVersions = $client->get($this->getRemoteFileUrl())->json();
+        if (empty($symfonyVersions)) {
+            throw new \RuntimeException(
+                "There was a problem while downloading the list of Symfony versions from\n".
+                "symfony.com. Check that you are online and the following URL is accessible:\n\n".
+                $this->getRemoteFileUrl()
+            );
+        }
+
+        $installable = array();
+        array_walk($symfonyVersions['installable'], function($version) use (&$installable) {
+            list($sfversion, $sfmajor, $sfminor) = explode('.', $version);
+            $branch = $sfversion.'.'.$sfmajor;
+            if (!array_key_exists($branch, $installable)) {
+                $installable[$branch] = array();
+            }
+            array_push($installable[$branch], $version);
+        });
+        $keys = array_keys($installable);
+        $lastKey = end($keys);
+
+        $output->writeln('<comment>Available tags version</comment>');
+        $table = new Table($output);
+        $table
+            ->setHeaders(array('Type', 'Version'))
+            ->setRows(array(
+                array($this->getColumnStyleGreen('lts'), $symfonyVersions['lts']),
+                array($this->getColumnStyleGreen('latest'), $symfonyVersions['latest']),
+                array($this->getColumnStyleGreen('dev'), $symfonyVersions['dev']),
+            ));
+        $table->render();
+
+        $output->writeln('<comment>Available versions by branch</comment>');
+        $table = new Table($output);
+        $table
+            ->setHeaders(array('Branches', 'Available versions'));
+        foreach ($installable as $branch => $versions) {
+            $versions[count($versions) - 1] = $this->getColumnStyleGreen(
+                $versions[count($versions) - 1]
+            );
+            $rows = array_map(function($values) {
+                return implode(', ', $values);
+            }, array_chunk($versions, 8));
+            $table->addRow(array(
+                new TableCell($this->getColumnStyleGreen($branch)),
+                new TableCell(implode(",\n", $rows))
+            ));
+            if ($lastKey != $branch) {
+                $table->addRow(new TableSeparator());
+            }
+        }
+        $table->render();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getDownloadedApplicationType()
+    {
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function getRemoteFileUrl()
+    {
+        return 'http://symfony.com/versions.json';
+    }
+
+    private function getColumnStyleGreen($value)
+    {
+        return sprintf('<info>%s</info>', $value);
+    }
+}

symfony

@@ -41,6 +41,7 @@ $app->add(new Symfony\Installer\AboutCommand($appVersion));
 $app->add(new Symfony\Installer\NewCommand());
 $app->add(new Symfony\Installer\DemoCommand());
 $app->add(new Symfony\Installer\SelfUpdateCommand());
+$app->add(new Symfony\Installer\AvailableVersionsCommand());
 
 $app->setDefaultCommand('about');