Merge pull request #5 from JBlond/extract

- Add extract feature

.gitignore

@@ -1,4 +1,5 @@
 /.idea
 /.phpunit.result.cache
 /composer.lock
+/example/cache/*/*.php
 /vendor

README.md

@@ -85,6 +85,9 @@ echo $tpl->render();
 * PHP Multibyte String ' gettext'
 * Twig >= 3.0
 
+### Optional Requirements
+
+* xgettext for Extract / generating po files.
 
 ### License (MIT License)
 

example/extract.php

@@ -0,0 +1,51 @@
+<?php
+
+use jblond\TwigTrans\Extract;
+use jblond\TwigTrans\Translation;
+use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
+use Twig\TwigFilter;
+
+require '../vendor/autoload.php';
+
+error_reporting(E_ALL);
+ini_set('display_errors', 'On');
+
+$langCode = 'de_DE';
+putenv("LC_ALL=$langCode.UTF-8");
+if (setlocale(LC_ALL, "$langCode.UTF-8") === false) {
+    echo sprintf('Language Code %s not found', $langCode);
+}
+
+// set the path to the translation
+bindtextdomain("Web_Content", "./locale");
+
+// choose Domain
+textdomain("Web_Content");
+
+$twigConfig = [
+    'cache' => './cache',
+    'debug' => true,
+    'auto_reload' => true
+];
+
+$twigLoader = new FilesystemLoader('./tpl/');
+$twig = new Environment($twigLoader, $twigConfig);
+
+// this is for the filter |trans
+$filter = new TwigFilter(
+    'trans',
+    function ($context, $string) {
+        return Translation::transGetText($string, $context);
+    },
+    ['needs_context' => true]
+);
+$twig->addFilter($filter);
+
+// load the i18n extension for using the translation tag for twig
+// {% trans %}my string{% endtrans %}
+$twig->addExtension(new Translation());
+
+$extract = new Extract($twig);
+$extract->addTemplate('default.twig');
+$extract->extract();

src/jblond/TwigTrans/Extract.php

@@ -0,0 +1,116 @@
+<?php
+
+namespace jblond\TwigTrans;
+
+use RuntimeException;
+use Twig\Environment;
+use Twig\Error\LoaderError;
+use Twig\Error\RuntimeError;
+use Twig\Error\SyntaxError;
+
+/**
+ *
+ */
+class Extract
+{
+    /**
+     * @var Environment
+     */
+    protected $environment;
+
+    /**
+     * Gettext parameters.
+     *
+     * @var string[]
+     */
+    protected $parameters;
+
+    /**
+     * @var
+     */
+    private $executable;
+
+    /**
+     * @param Environment $environment
+     */
+    public function __construct(Environment $environment)
+    {
+        $this->environment = $environment;
+        $this->reset();
+    }
+
+    /**
+     * @param mixed $executable
+     * @return void
+     */
+    public function setExecutable($executable): void
+    {
+        $this->executable = $executable;
+    }
+
+    /**
+     * @return void
+     */
+    protected function reset(): void
+    {
+        $this->parameters = [];
+    }
+
+    /**
+     * @param string $path
+     * @throws SyntaxError
+     * @throws LoaderError
+     * @throws RuntimeError
+     * @return void
+     */
+    public function addTemplate(string $path): void
+    {
+        $this->environment->load($path);
+    }
+
+    /**
+     * @param $parameter
+     * @return void
+     */
+    public function addGettextParameter($parameter): void
+    {
+        $this->parameters[] = $parameter;
+    }
+
+    /**
+     * @param array $parameters
+     * @return void
+     */
+    public function setGettextParameters(array $parameters): void
+    {
+        $this->parameters = $parameters;
+    }
+
+
+    /**
+     * @return void
+     */
+    public function extract(): void
+    {
+        $cacheDirectory = $this->environment->getCache();
+        if ($cacheDirectory === false) {
+            throw new RuntimeException('No cache directory is set');
+        }
+        $command = $this->executable ? : 'xgettext';
+        $command .= ' ' . implode(' ', $this->parameters);
+        $command .= ' ' . $cacheDirectory . '/*/*.php';
+        echo $command;
+        $error = 0;
+        $output = system($command, $error);
+        if (0 !== $error) {
+            throw new RuntimeException(sprintf(
+                'Gettext command "%s" failed with error code %s and output: %s',
+                $command,
+                $error,
+                $output
+            ));
+        }
+
+        $this->reset();
+    }
+}