Fix #476 Auto language changing when first launch

- Freeseer will now scan the System language for the first time.
If there is translation for the location, the interface language
will be set to that language by default. Otherwise en_US will be used.
- Unit test for this function is also added..

src/freeseer/frontend/configtool/configtool.py

@@ -55,11 +55,10 @@ class ConfigToolApp(FreeseerApp):
     '''
 
     def __init__(self, profile, config):
-        FreeseerApp.__init__(self)
+        super(ConfigToolApp, self).__init__(config)
 
         # Load Config Stuff
         self.profile = profile
-        self.config = config
 
         icon = QtGui.QIcon()
         icon.addPixmap(QtGui.QPixmap(_fromUtf8(":/freeseer/logo.png")), QtGui.QIcon.Normal, QtGui.QIcon.Off)

src/freeseer/frontend/qtcommon/FreeseerApp.py

@@ -54,8 +54,9 @@
 
 class FreeseerApp(QMainWindow):
 
-    def __init__(self):
+    def __init__(self, config):
         super(FreeseerApp, self).__init__()
+        self.config = config
         self.icon = QIcon()
         self.icon.addPixmap(QPixmap(_fromUtf8(":/freeseer/logo.png")), QIcon.Normal, QIcon.Off)
         self.setWindowIcon(self.icon)
@@ -182,6 +183,3 @@ def setupLanguageMenu(self):
             languageAction.setData(language)
             self.menuLanguage.addAction(languageAction)
             self.langActionGroup.addAction(languageAction)
-
-            if self.current_language == str(language).strip("tr_").rstrip(".qm"):
-                languageAction.setChecked(True)

src/freeseer/frontend/record/record.py

@@ -54,10 +54,9 @@ class RecordApp(FreeseerApp):
     """Freeseer's main GUI class."""
 
     def __init__(self, profile, config):
-        FreeseerApp.__init__(self)
+        super(RecordApp, self).__init__(config)
 
         self.db = profile.get_database()
-        self.config = config
         self.controller = RecordingController(profile, self.db, self.config)
 
         self.recently_recorded_video = None

src/freeseer/frontend/reporteditor/reporteditor.py

@@ -55,9 +55,8 @@ class ReportEditorApp(FreeseerApp):
     '''
 
     def __init__(self, config, db):
-        FreeseerApp.__init__(self)
+        super(ReportEditorApp, self).__init__(config)
 
-        self.config = config
         self.db = db
 
         icon = QIcon()

src/freeseer/frontend/talkeditor/talkeditor.py

@@ -59,9 +59,8 @@
 class TalkEditorApp(FreeseerApp):
     '''Freeseer talk database editor main gui class'''
     def __init__(self, config, db):
-        FreeseerApp.__init__(self)
+        super(TalkEditorApp, self).__init__(config)
 
-        self.config = config
         self.db = db
 
         icon = QIcon()

src/freeseer/settings.py

@@ -24,6 +24,8 @@
 
 import os
 
+from PyQt4.QtCore import QLocale
+
 from freeseer.framework.config.core import Config
 from freeseer.framework.config.profile import ProfileManager
 import freeseer.framework.config.options as options
@@ -36,6 +38,26 @@
 profile_manager = ProfileManager(os.path.join(configdir, 'profiles'))
 
 
+def detect_system_language():
+    """Detect the system language"""
+
+    current_language = 'tr_{}'.format(QLocale.system().name())
+    tr_path = os.path.join(os.path.dirname(os.path.realpath(__file__)),
+                           'frontend',
+                           'qtcommon',
+                           'languages')
+    tr_file_with_country = os.path.join(tr_path,
+                                        '{}.ts'.format(current_language))
+    tr_file_language_only = os.path.join(tr_path,
+                                         '{}.ts'.format(current_language[:-3]))
+    if os.path.isfile(tr_file_with_country):
+        return '{}.qm'.format(current_language)
+    elif os.path.isfile(tr_file_language_only):
+        return '{}.qm'.format(current_language[:-3])
+    else:
+        return 'tr_en_US.qm'
+
+
 class FreeseerConfig(Config):
     """General Freeseer profile settings."""
 
@@ -51,4 +73,4 @@ class FreeseerConfig(Config):
     record_to_stream_plugin = options.StringOption('RTMP Streaming')
     audio_feedback = options.BooleanOption(False)
     video_preview = options.BooleanOption(True)
-    default_language = options.StringOption('tr_en_US.qm')
+    default_language = options.StringOption(detect_system_language())

src/freeseer/tests/test_settings.py

@@ -0,0 +1,46 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+# freeseer - vga/presentation capture software
+#
+# Copyright (C) 2014 Free and Open Source Software Learning Centre
+# http://fosslc.org
+#
+# 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 3 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, see <http://www.gnu.org/licenses/>.
+
+# For support, questions, suggestions or any other inquiries, visit:
+# http://wiki.github.com/Freeseer/freeseer/
+
+from PyQt4.QtCore import QLocale
+
+from freeseer.settings import detect_system_language
+
+
+class TestSettings:
+    """ Test Class for settings.py unit test"""
+
+    def test_detect_system_language_translation_found(self, monkeypatch):
+        """Tests detect_system_language() returns the appropriate translation filename for the system language."""
+        locales = ("ar_EG", "de_DE", "en_US", "fr_CA",
+                     "ja", "nl_NL", "sv_SE", "zh_CN", "zh_HK")
+        for locale in locales:
+            monkeypatch.setattr(QLocale, "name",
+                                lambda x: locale)
+            assert detect_system_language() == "tr_{}.qm".format(locale)
+
+    def test_detect_system_language_translation_not_found(self, monkeypatch):
+        """Tests detect_system_language() returns default if no translation found for system language."""
+        monkeypatch.setattr(QLocale, "name",
+                            lambda x: "fr_FR")
+        assert detect_system_language() == "tr_en_US.qm"