Rewrite listLanguages function to add more checks and fix misidentification of default language

nw/config.py

@@ -394,14 +394,23 @@ class Config:
         return
 
     def listLanguages(self):
-        langs = dict(map(lambda lang: (lang, QLocale(lang).nativeLanguageName().title()),
-                         map(lambda v: v[0][3:],
-                             filter(lambda v: v[0].startswith("nw_") and v[1] == ".qm",
-                                    map(os.path.splitext, os.listdir(self.nwLangPath))))))
-        if "en" not in langs:
-            langs["en"] = QLocale("en").nativeLanguageName().title()
+        """List localisation files in the i18n folder. The default GUI
+        language 'en_GB' is British English.
+        """
+        langList = {
+            "en_GB": QLocale("en_GB").nativeLanguageName().title()
+        }
+        for qmFile in os.listdir(self.nwLangPath):
+            if not os.path.isfile(os.path.join(self.nwLangPath, qmFile)):
+                continue
+            if not qmFile.startswith("nw_") or not qmFile.endswith(".qm"):
+                continue
+            qmLang = qmFile[3:-3]
+            qmName = QLocale(qmLang).nativeLanguageName().title()
+            if qmLang and qmName:
+                langList[qmLang] = qmName
 
-        return sorted(langs.items(), key=lambda x: x[0])
+        return sorted(langList.items(), key=lambda x: x[0])
 
     def loadConfig(self):
         """Load preferences from file and replace default settings.

nw/gui/preferences.py

@@ -137,10 +137,11 @@ class GuiPreferencesGeneral(QWidget):
         # Look and Feel
         # =============
         self.mainForm.addGroupLabel(self.tr("Look and Feel"))
+        minWidth = self.mainConf.pxInt(200)
 
         ## Select Locale
         self.guiLang = QComboBox()
-        self.guiLang.setMinimumWidth(self.mainConf.pxInt(200))
+        self.guiLang.setMinimumWidth(minWidth)
         self.theLangs = self.mainConf.listLanguages()
         print(self.theLangs)
         for lang, langName in self.theLangs:
@@ -157,7 +158,7 @@ class GuiPreferencesGeneral(QWidget):
 
         ## Select Theme
         self.guiTheme = QComboBox()
-        self.guiTheme.setMinimumWidth(self.mainConf.pxInt(200))
+        self.guiTheme.setMinimumWidth(minWidth)
         self.theThemes = self.theTheme.listThemes()
         for themeDir, themeName in self.theThemes:
             self.guiTheme.addItem(themeName, themeDir)
@@ -173,7 +174,7 @@ class GuiPreferencesGeneral(QWidget):
 
         ## Select Icon Theme
         self.guiIcons = QComboBox()
-        self.guiIcons.setMinimumWidth(self.mainConf.pxInt(200))
+        self.guiIcons.setMinimumWidth(minWidth)
         self.theIcons = self.theTheme.theIcons.listThemes()
         for iconDir, iconName in self.theIcons:
             self.guiIcons.addItem(iconName, iconDir)