Created GenerateCharsetCommand

module/CLI/config/cli.config.php

@@ -10,6 +10,7 @@ return [
             Command\ListShortcodesCommand::class,
             Command\GetVisitsCommand::class,
             Command\ProcessVisitsCommand::class,
+            Command\Config\GenerateCharsetCommand::class,
         ]
     ],
 

module/CLI/config/dependencies.config.php

@@ -1,19 +1,22 @@
 <?php
 use Acelaya\ZsmAnnotatedServices\Factory\V3\AnnotatedFactory;
-use Shlinkio\Shlink\CLI;
+use Shlinkio\Shlink\CLI\Command;
-use Symfony\Component\Console;
+use Shlinkio\Shlink\CLI\Factory\ApplicationFactory;
+use Symfony\Component\Console\Application;
 
 return [
 
     'dependencies' => [
         'factories' => [
-            Console\Application::class => CLI\Factory\ApplicationFactory::class,
+            Application::class => ApplicationFactory::class,
 
-            CLI\Command\GenerateShortcodeCommand::class => AnnotatedFactory::class,
+            Command\GenerateShortcodeCommand::class => AnnotatedFactory::class,
-            CLI\Command\ResolveUrlCommand::class => AnnotatedFactory::class,
+            Command\ResolveUrlCommand::class => AnnotatedFactory::class,
-            CLI\Command\ListShortcodesCommand::class => AnnotatedFactory::class,
+            Command\ListShortcodesCommand::class => AnnotatedFactory::class,
-            CLI\Command\GetVisitsCommand::class => AnnotatedFactory::class,
+            Command\GetVisitsCommand::class => AnnotatedFactory::class,
-            CLI\Command\ProcessVisitsCommand::class => AnnotatedFactory::class,
+            Command\ProcessVisitsCommand::class => AnnotatedFactory::class,
+            Command\ProcessVisitsCommand::class => AnnotatedFactory::class,
+            Command\Config\GenerateCharsetCommand::class => AnnotatedFactory::class,
         ],
     ],
 

module/CLI/src/Command/Config/GenerateCharsetCommand.php

@@ -0,0 +1,44 @@
+<?php
+namespace Shlinkio\Shlink\CLI\Command\Config;
+
+use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Shlinkio\Shlink\Core\Service\UrlShortener;
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Zend\I18n\Translator\TranslatorInterface;
+
+class GenerateCharsetCommand extends Command
+{
+    /**
+     * @var TranslatorInterface
+     */
+    private $translator;
+
+    /**
+     * GenerateCharsetCommand constructor.
+     * @param TranslatorInterface $translator
+     *
+     * @Inject({"translator"})
+     */
+    public function __construct(TranslatorInterface $translator)
+    {
+        $this->translator = $translator;
+        parent::__construct(null);
+    }
+
+    public function configure()
+    {
+        $this->setName('config:generate-charset')
+             ->setDescription(sprintf($this->translator->translate(
+                 'Generates a character set sample just by shuffling the default one, "%s". '
+                 . 'Then it can be set in the SHORTCODE_CHARS environment variable'
+             ), UrlShortener::DEFAULT_CHARS));
+    }
+
+    public function execute(InputInterface $input, OutputInterface $output)
+    {
+        $charSet = str_shuffle(UrlShortener::DEFAULT_CHARS);
+        $output->writeln($this->translator->translate('Character set:') . sprintf(' <info>%s</info>', $charSet));
+    }
+}

module/CLI/test/Command/Config/GenerateCharsetCommandTest.php

@@ -0,0 +1,56 @@
+<?php
+namespace ShlinkioTest\Shlink\CLI\Command\Config;
+
+use PHPUnit_Framework_TestCase as TestCase;
+use Shlinkio\Shlink\CLI\Command\Config\GenerateCharsetCommand;
+use Shlinkio\Shlink\Core\Service\UrlShortener;
+use Symfony\Component\Console\Application;
+use Symfony\Component\Console\Tester\CommandTester;
+use Zend\I18n\Translator\Translator;
+
+class GenerateCharsetCommandTest extends TestCase
+{
+    /**
+     * @var CommandTester
+     */
+    protected $commandTester;
+
+    public function setUp()
+    {
+        $command = new GenerateCharsetCommand(Translator::factory([]));
+        $app = new Application();
+        $app->add($command);
+
+        $this->commandTester = new CommandTester($command);
+    }
+
+    /**
+     * @test
+     */
+    public function charactersAreGeneratedFromDefault()
+    {
+        $prefix = 'Character set: ';
+        $prefixLength = strlen($prefix);
+
+        $this->commandTester->execute([
+            'command' => 'config:generate-charset',
+        ]);
+        $output = $this->commandTester->getDisplay();
+
+        // Both default character set and the new one should have the same length
+        $this->assertEquals($prefixLength + strlen(UrlShortener::DEFAULT_CHARS) + 1, strlen($output));
+
+        // Both default character set and the new one should have the same characters
+        $charset = substr($output, $prefixLength, strlen(UrlShortener::DEFAULT_CHARS));
+        $orderedDefault = $this->orderStringLetters(UrlShortener::DEFAULT_CHARS);
+        $orderedCharset = $this->orderStringLetters($charset);
+        $this->assertEquals($orderedDefault, $orderedCharset);
+    }
+
+    protected function orderStringLetters($string)
+    {
+        $letters = str_split($string);
+        sort($letters);
+        return implode('', $letters);
+    }
+}