From 900e04cedab0ddf78d92c85b030d712f4f713819 Mon Sep 17 00:00:00 2001
From: Bastian Kleineidam <bastian.kleineidam@web.de>
Date: Sat, 1 Mar 2014 12:01:47 +0100
Subject: [PATCH] Dynamic language switch in the GUI.

---
 linkcheck/gui/__init__.py | 33 +++++++++++++++++++++++++++++++--
 linkcheck/i18n.py         | 16 ++++++++++++----
 2 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/linkcheck/gui/__init__.py b/linkcheck/gui/__init__.py
index a9ca2679..0f1f1873 100644
--- a/linkcheck/gui/__init__.py
+++ b/linkcheck/gui/__init__.py
@@ -37,7 +37,7 @@ from .settings import Settings
 from .recentdocs import RecentDocumentModel
 from .projects import openproject, saveproject, loadproject, ProjectExt
 from .. import configuration, checker, director, get_link_pat, \
-    strformat, fileutil, LinkCheckerError
+    strformat, fileutil, LinkCheckerError, i18n
 from ..containers import enum
 from .. import url as urlutil
 from ..checker import httpheaders
@@ -135,6 +135,18 @@ class LinkCheckerMain (QtGui.QMainWindow, Ui_MainWindow):
     def init_menu (self):
         """Add menu entries for bookmark file checking."""
         self.urlinput.addMenuEntries(self.menuEdit)
+        self.menuLang = self.menuEdit.addMenu(_('Languages'))
+        self.menuLang.setTitle(_("&Language"))
+        # ensure only one action is checked
+        langActionGroup = QtGui.QActionGroup(self)
+        langActionGroup.triggered.connect(self.switch_language)
+        for i, lang in enumerate(sorted(i18n.supported_languages)):
+            action = self.menuLang.addAction("&%d %s" % (i, lang))
+            action.setCheckable(True)
+            action.setData(lang)
+            if lang == i18n.default_language:
+                action.setChecked(True)
+            langActionGroup.addAction(action)
 
     def init_drop(self):
         """Set and activate drag-and-drop functions."""
@@ -309,7 +321,7 @@ class LinkCheckerMain (QtGui.QMainWindow, Ui_MainWindow):
         elif status == Status.checking:
             self.treeView.setSortingEnabled(False)
             self.debug.reset()
-            self.set_statusmsg(u"Checking site...")
+            self.set_statusmsg(_(u"Checking site..."))
             # disable commands
             self.menubar.setEnabled(False)
             self.urlinput.setEnabled(False)
@@ -580,3 +592,20 @@ Version 2 or later.
             loadproject(self, filename)
         else:
             self.urlinput.setText(url.toString())
+
+    def retranslateUi(self, Window):
+        """Translate menu titles."""
+        super(LinkCheckerMain, self).retranslateUi(Window)
+        # self.menu_lang is created after calling retranslateUi
+        # the first time, so check for its excistance
+        if hasattr(self, "menu_lang"):
+            self.menuLang.setTitle(_("&Language"))
+
+    def switch_language(self, action):
+        """Change UI language."""
+        lang = str(action.data().toString())
+        i18n.install_language(lang)
+        self.retranslateUi(self)
+        self.options.retranslateUi(self.options)
+        self.debug.retranslateUi(self.debug)
+        self.editor.retranslateUi(self.editor)
diff --git a/linkcheck/i18n.py b/linkcheck/i18n.py
index 65523a60..8e9cd22e 100644
--- a/linkcheck/i18n.py
+++ b/linkcheck/i18n.py
@@ -28,6 +28,8 @@ import codecs
 # more supported languages are added in init()
 supported_languages = set(['en'])
 default_language = default_encoding = None
+default_directory = None
+default_domain = None
 
 def install_builtin (translator, do_unicode):
     """Install _() and _n() gettext methods into default namespace."""
@@ -62,7 +64,9 @@ class NullTranslator (gettext.NullTranslations):
 def init (domain, directory, loc=None):
     """Initialize this gettext i18n module. Searches for supported languages
     and installs the gettext translator class."""
-    global default_language, default_encoding
+    global default_language, default_encoding, default_domain, default_directory
+    default_directory = directory
+    default_domain = domain
     if os.path.isdir(directory):
         # get supported languages
         for lang in os.listdir(directory):
@@ -81,9 +85,13 @@ def init (domain, directory, loc=None):
     # Even if the default language is not supported, the encoding should
     # be installed. Otherwise the Python installation is borked.
     default_encoding = encoding
-    # install translation service routines into default namespace
-    translator = get_translator(domain, directory,
-                                languages=[default_language], fallback=True)
+    install_language(default_language)
+
+
+def install_language(language):
+    """Install translation service routines into default namespace."""
+    translator = get_translator(default_domain, default_directory,
+        languages=[get_lang(language)], fallback=True)
     do_unicode = True
     translator.install(do_unicode)