added version command and api endpoint (#321)

src/Command/VersionCommand.php

@@ -0,0 +1,73 @@
+<?php
+
+/*
+ * This file is part of the Kimai time-tracking app.
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace App\Command;
+
+use App\Constants;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Style\SymfonyStyle;
+
+/**
+ * Command used to fetch Kimai version information.
+ */
+class VersionCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('kimai:version')
+            ->setDescription('Receive version information')
+            ->setHelp('This command allows you to fetch various version information about Kimai.')
+            ->addOption('name', null, InputOption::VALUE_NONE, 'Display the major release name')
+            ->addOption('candidate', null, InputOption::VALUE_NONE, 'Display the current version candidate (e.g. "stable" or "dev")')
+            ->addOption('short', null, InputOption::VALUE_NONE, 'Display the version only')
+            ->addOption('semver', null, InputOption::VALUE_NONE, 'Semantical versioning (SEMVER) compatible version string')
+        ;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $io = new SymfonyStyle($input, $output);
+
+        if ($input->getOption('semver')) {
+            $io->writeln(Constants::VERSION . '-' . Constants::STATUS);
+
+            return;
+        }
+
+        if ($input->getOption('short')) {
+            $io->writeln(Constants::VERSION);
+
+            return;
+        }
+
+        if ($input->getOption('name')) {
+            $io->writeln(Constants::NAME);
+
+            return;
+        }
+
+        if ($input->getOption('candidate')) {
+            $io->writeln(Constants::STATUS);
+
+            return;
+        }
+
+        $io->writeln('Kimai 2 - ' . Constants::VERSION . ' ' . Constants::STATUS . ' (' . Constants::NAME . ') by Kevin Papst and contributors.');
+    }
+}