Refactor i18n implementation

One can now use $this->translate(msg) in a view or controller without the
need to pass the module domain (web&cli). Forms still need to be built
with _t(msg) and _mt(dom, msg).

refs #5533

library/Icinga/Application/ApplicationBootstrap.php

@@ -31,13 +31,11 @@ namespace Icinga\Application;
 
 use \DateTimeZone;
 use \Exception;
-use \Zend_Loader_Autoloader;
 use \Icinga\Application\Modules\Manager as ModuleManager;
-use \Icinga\Application\Platform;
 use \Icinga\Application\Config;
-use \Icinga\Exception\ProgrammingError;
 use \Icinga\Exception\ConfigurationError;
 use \Icinga\Util\DateTimeFactory;
+use \Icinga\Util\Translator;
 
 use Icinga\Data\ResourceFactory;
 
@@ -427,4 +425,23 @@ abstract class ApplicationBootstrap
         DateTimeFactory::setConfig(array('timezone' => $tz));
         return $this;
     }
+
+    /**
+     * Setup internationalization using gettext
+     *
+     * Uses the language defined in the global config or the default one
+     *
+     * @return  self
+     */
+    protected function setupInternationalization()
+    {
+        Translator::setupLocale($this->config->global->get('language', 'en_US'));
+
+        $localeDir = $this->getApplicationDir('locale');
+        if (file_exists($localeDir) && is_dir($localeDir)) {
+            Translator::registerDomain('icinga', $localeDir);
+        }
+
+        return $this;
+    }
 }

library/Icinga/Application/Cli.php

@@ -31,7 +31,6 @@ namespace Icinga\Application;
 
 use Icinga\Application\Platform;
 use Icinga\Application\ApplicationBootstrap;
-use Icinga\Application\Modules\Manager as ModuleManager;
 use Icinga\Cli\Params;
 use Icinga\Cli\Loader;
 use Icinga\Cli\Screen;
@@ -63,12 +62,12 @@ class Cli extends ApplicationBootstrap
     {
         $this->assertRunningOnCli();
         $this->setupConfig()
-             ->parseBasicParams()
-             ->fixLoggingConfig()
-             ->setupErrorHandling()
-             ->setupResourceFactory()
-             ->setupModuleManager()
-             ;
+            ->setupInternationalization()
+            ->parseBasicParams()
+            ->fixLoggingConfig()
+            ->setupErrorHandling()
+            ->setupResourceFactory()
+            ->setupModuleManager();
     }
 
     protected function fixLoggingConfig()

library/Icinga/Application/Modules/Module.php

@@ -35,6 +35,7 @@ use Icinga\Application\ApplicationBootstrap;
 use Icinga\Application\Config;
 use Icinga\Application\Icinga;
 use Icinga\Application\Logger;
+use Icinga\Util\Translator;
 use Icinga\Web\Hook;
 
 /**
@@ -422,7 +423,7 @@ class Module
     protected function registerLocales()
     {
         if (file_exists($this->localedir) && is_dir($this->localedir)) {
-            bindtextdomain($this->name, $this->localedir);
+            Translator::registerDomain($this->name, $this->localedir);
         }
         return $this;
     }

library/Icinga/Application/Web.php

@@ -50,6 +50,7 @@ use Icinga\User\Preferences\SessionStore;
 use Icinga\Util\DateTimeFactory;
 use Icinga\Session\Session as BaseSession;
 use Icinga\Web\Session;
+use Icinga\Util\Translator;
 
 /**
  * Use this if you want to make use of Icinga functionality in other web projects
@@ -116,10 +117,10 @@ class Web extends ApplicationBootstrap
             ->setupResourceFactory()
             ->setupSession()
             ->setupUser()
+            ->setupInternationalization()
             ->setupTimezone()
             ->setupRequest()
             ->setupZendMvc()
-            ->setupTranslation()
             ->setupModuleManager()
             ->loadEnabledModules()
             ->setupRoute()
@@ -168,25 +169,6 @@ class Web extends ApplicationBootstrap
         return $this->viewRenderer;
     }
 
-    /**
-     * Load translations
-     *
-     * @return self
-     */
-    private function setupTranslation()
-    {
-        // AuthManager::getInstance()->getSession()->language;
-        $locale = null;
-        if (!$locale) {
-            $locale = 'en_US';
-        }
-        putenv('LC_ALL=' . $locale . '.UTF-8');
-        setlocale(LC_ALL, $locale . '.UTF-8');
-        bindtextdomain('icinga', $this->getApplicationDir() . '/locale');
-        textdomain('icinga');
-        return $this;
-    }
-
     /**
      * Dispatch public interface
      */
@@ -449,4 +431,30 @@ class Web extends ApplicationBootstrap
         DateTimeFactory::setConfig(array('timezone' => $tz));
         return $this;
     }
+
+    /**
+     * Setup internationalization using gettext
+     *
+     * Uses the preferred user language or the configured default and system default, respectively.
+     *
+     * @return  self
+     */
+    protected function setupInternationalization()
+    {
+        parent::setupInternationalization();
+        $userLocale = $this->user === null ? null : $this->user->getPreferences()->get('app.language');
+
+        if ($userLocale) {
+            try {
+                Translator::setupLocale($userLocale);
+            } catch (Exception $error) {
+                Logger::error(
+                    'Cannot set locale "' . $userLocale . '" configured in ' .
+                    'preferences of user "' . $this->user->getUsername() . '"'
+                );
+            }
+        }
+
+        return $this;
+    }
 }

library/Icinga/Application/functions.php

@@ -27,31 +27,25 @@
  */
 // {{{ICINGA_LICENSE_HEADER}}}
 
-if (function_exists('_')) {
-    function t($messageId = null)
+use \Icinga\Util\Translator;
+
+if (extension_loaded('gettext')) {
+    function t($messageId)
     {
-        $msg = _($messageId);
-        if (! $msg) {
-            return $messageId;
-        }
-        return $msg;
+        return Translator::translate($messageId, 'icinga');
     }
 
-    function mt($domain, $messageId = null)
+    function mt($domain, $messageId)
     {
-        $msg = dgettext($domain, $messageId);
-        if (! $msg) {
-            return $messageId;
-        }
-        return $msg;
+        return Translator::translate($messageId, $domain);
     }
 } else {
-    function t($messageId = null)
+    function t($messageId)
     {
         return $messageId;
     }
 
-    function mt($domain, $messageId = null)
+    function mt($domain, $messageId)
     {
         return $messageId;
     }

library/Icinga/Cli/Command.php

@@ -2,8 +2,8 @@
 
 namespace Icinga\Cli;
 
-use Icinga\Cli\Loader;
 use Icinga\Cli\Screen;
+use Icinga\Util\Translator;
 use Icinga\Application\ApplicationBootstrap as App;
 use Exception;
 
@@ -48,6 +48,21 @@ abstract class Command
         return $this->trace;
     }
 
+    /**
+     * Translate a string
+     *
+     * Autoselects the module domain, if any, and falls back to the global one if no translation could be found.
+     *
+     * @param   string  $text   The string to translate
+     *
+     * @return  string          The translated string
+     */
+    public function translate($text)
+    {
+        $domain = $this->moduleName === null ? 'icinga' : $this->moduleName;
+        return Translator::translate($text, $domain);
+    }
+
     public function fail($msg)
     {
         throw new Exception($msg);

library/Icinga/Util/Translator.php

@@ -0,0 +1,108 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+/**
+ * This file is part of Icinga Web 2.
+ *
+ * Icinga Web 2 - Head for multiple monitoring backends.
+ * Copyright (C) 2014 Icinga Development Team
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * @copyright  2014 Icinga Development Team <info@icinga.org>
+ * @license    http://www.gnu.org/licenses/gpl-2.0.txt GPL, version 2
+ * @author     Icinga Development Team <info@icinga.org>
+ *
+ */
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Util;
+
+use \Exception;
+
+/**
+ * Helper class to ease internationalization when using gettext
+ */
+class Translator
+{
+    /**
+     * The default gettext domain used as fallback
+     */
+    const DEFAULT_DOMAIN = 'icinga';
+
+    /**
+     * Known gettext domains
+     *
+     * @var array
+     */
+    private static $knownDomains = array();
+
+    /**
+     * Translate a string
+     *
+     * Falls back to the default domain in case the string cannot be translated using the given domain
+     *
+     * @param   string  $text       The string to translate
+     * @param   string  $domain     The primary domain to use
+     *
+     * @return  string              The translated string
+     *
+     * @throws  Exception           In case the given domain is unknown
+     */
+    public static function translate($text, $domain)
+    {
+        if ($domain !== self::DEFAULT_DOMAIN && !in_array($domain, self::$knownDomains)) {
+            throw new Exception("Cannot translate string '$text' with unknown domain '$domain'");
+        }
+
+        $res = dgettext($domain, $text);
+        if ($res === $text && $domain !== self::DEFAULT_DOMAIN) {
+            return dgettext(self::DEFAULT_DOMAIN, $text);
+        }
+        return $res;
+    }
+
+    /**
+     * Register a new gettext domain
+     *
+     * @param   string  $name       The name of the domain to register
+     * @param   string  $directory  The directory where message catalogs can be found
+     *
+     * @throws  Exception           In case the domain was not successfully registered
+     */
+    public static function registerDomain($name, $directory)
+    {
+        if (bindtextdomain($name, $directory) === false) {
+            throw new Exception("Cannot register domain '$name' with path '$directory'");
+        }
+        bind_textdomain_codeset($name, 'UTF-8');
+        self::$knownDomains[] = $name;
+    }
+
+    /**
+     * Set the locale to use
+     *
+     * @param   string  $localeName     The name of the locale to use
+     *
+     * @throws  Exception               In case the locale's name is invalid
+     */
+    public static function setupLocale($localeName)
+    {
+        if (setlocale(LC_ALL, $localeName . '.UTF-8') === false) {
+            throw new Exception("Cannot set locale '$localeName.UTF-8' for category 'LC_ALL'");
+        }
+        putenv('LC_ALL=' . $localeName . '.UTF-8'); // Failsafe, Win and Unix
+        putenv('LANG=' . $localeName . '.UTF-8'); // Windows fix, untested
+    }
+}

library/Icinga/Web/Controller/ActionController.php

@@ -32,17 +32,13 @@ namespace Icinga\Web\Controller;
 use \Exception;
 use \Zend_Controller_Action;
 use \Zend_Controller_Request_Abstract;
-use \Zend_Controller_Front;
 use \Zend_Controller_Response_Abstract;
 use \Zend_Controller_Action_HelperBroker;
-use \Zend_Layout;
 use Icinga\Authentication\Manager as AuthManager;
 use Icinga\Application\Benchmark;
-use Icinga\Application\Config;
-use Icinga\Web\Notification;
+use Icinga\Util\Translator;
 use Icinga\Web\Widget\Tabs;
 use Icinga\Web\Url;
-use Icinga\Web\Request;
 
 /**
  * Base class for all core action controllers
@@ -152,15 +148,19 @@ class ActionController extends Zend_Controller_Action
     }
 
     /**
-     * Translate the given string with the global translation catalog
+     * Translate a string
      *
-     * @param   string $string The string that should be translated
+     * Autoselects the module domain, if any, and falls back to the global one if no translation could be found.
      *
-     * @return  string
+     * @param   string  $text   The string to translate
+     *
+     * @return  string          The translated string
      */
-    public function translate($string)
+    public function translate($text)
     {
-        return t($string);
+        $module = $this->getRequest()->getModuleName();
+        $domain = $module === 'default' ? 'icinga' : $module;
+        return Translator::translate($text, $domain);
     }
 
     /**
@@ -212,7 +212,6 @@ class ActionController extends Zend_Controller_Action
         $this->_helper->Redirector->gotoUrlAndExit($url);
     }
 
-
     /**
      * Detect whether the current request requires changes in the layout and apply them before rendering
      *