Default translation with prefix

Command/ExtractCommand.php

@@ -92,13 +92,14 @@ protected function configure()
             ->addArgument('locale', InputArgument::OPTIONAL, 'The locale ot use. If omitted, we use all configured locales.', false)
             ->addOption('hide-errors', null, InputOption::VALUE_NONE, 'If we should print error or not')
             ->addOption('bundle', 'b', InputOption::VALUE_REQUIRED, 'The bundle you want extract translations from.')
+            ->addArgument('prefixTarget', InputArgument::OPTIONAL, 'The prefix of Target', null)
         ;
     }
 
     protected function execute(InputInterface $input, OutputInterface $output)
     {
         $config = $this->configurationManager->getConfiguration($input->getArgument('configuration'));
-
+        $prefixTarget = $input->getArgument('prefixTarget');
         $locales = [];
         if ($inputLocale = $input->getArgument('locale')) {
             $locales = [$inputLocale];
@@ -112,7 +113,7 @@ protected function execute(InputInterface $input, OutputInterface $output)
             'blacklist_domains' => $config->getBlacklistDomains(),
             'whitelist_domains' => $config->getWhitelistDomains(),
             'project_root' => $config->getProjectRoot(),
-        ]);
+        ], $prefixTarget);
         $errors = $result->getErrors();
 
         $this->catalogueWriter->writeCatalogues($config, $result->getMessageCatalogues());

Service/Importer.php

@@ -64,9 +64,11 @@ public function __construct(Extractor $extractor, \Twig_Environment $twig)
      *     @var string $project_root The project root will be removed from the source location.
      * }
      *
+     * @param string|null $prefixTarget
+     *
      * @return ImportResult
      */
-    public function extractToCatalogues(Finder $finder, array $catalogues, array $config = [])
+    public function extractToCatalogues(Finder $finder, array $catalogues, array $config = [], string $prefixTarget = null)
     {
         $this->processConfig($config);
         $this->disableTwigVisitors();
@@ -96,6 +98,9 @@ public function extractToCatalogues(Finder $finder, array $catalogues, array $co
                     $meta = $this->getMetadata($result, $key, $domain);
                     $meta->setState('new');
                     $this->setMetadata($result, $key, $domain, $meta);
+                    if (null !== $prefixTarget) {
+                        $this->setTarget($catalogue, $key, $prefixTarget, $domain, $translation);
+                    }
 
                     // Add custom translations that we found in the source
                     if (null === $translation) {
@@ -163,6 +168,18 @@ private function getMetadata(MessageCatalogue $catalogue, $key, $domain)
         return new Metadata($catalogue->getMetadata($key, $domain));
     }
 
+    /**
+     * @param MessageCatalogue $catalogue
+     * @param $key
+     * @param $prefix
+     * @param $domain
+     * @param string $translation
+     */
+    private function setTarget(MessageCatalogue $catalogue, $key, $prefix, $domain, $translation = '')
+    {
+        $catalogue->set($key, '' !== $translation ? $translation : $prefix.$key, $domain);
+    }
+
     /**
      * @param MessageCatalogue $catalogue
      * @param $key