basic i18n

.gitignore

@@ -77,10 +77,6 @@ coverage.xml
 .hypothesis/
 .pytest_cache/
 
-# Translations
-*.mo
-*.pot
-
 # Django stuff:
 *.log
 local_settings.py

katrain/__main__.py

@@ -29,6 +29,7 @@ from katrain.gui.kivyutils import *
 from katrain.gui.badukpan import BadukPanWidget
 from katrain.gui.controlspanel import ControlsPanel
 from katrain.gui.popups import NewGamePopup, ConfigPopup, LoadSGFPopup
+from katrain.core.common import Lang
 
 __version__ = "1.1.0"
 
@@ -327,8 +328,11 @@ class KaTrainGui(Screen):
         return True
 
 
+LANGUAGE = "nl"
+i18n = Lang(LANGUAGE)
 class KaTrainApp(MDApp):
     gui = ObjectProperty(None)
+    language = StringProperty(LANGUAGE)
 
     def build(self):
         self.icon = ICON  # how you're supposed to set an icon
@@ -340,6 +344,10 @@ class KaTrainApp(MDApp):
         Window.bind(on_request_close=self.on_request_close)
         return self.gui
 
+    def on_language(self, _instance, language):
+        self.gui.log(f"Switching language to {language}",OUTPUT_INFO)
+        i18n.switch_lang(language)
+
     def on_start(self):
         self.gui.start()
 

katrain/core/common.py

@@ -1,6 +1,7 @@
 import os
 from typing import Any, List, Tuple
-
+from kivy.lang import Observable
+import gettext
 try:
     import importlib.resources as pkg_resources
 except:
@@ -45,3 +46,42 @@ def find_package_resource(path):
             return f"FILENOTFOUND::{path}"
     else:
         return path  # absolute path
+
+
+class Lang(Observable):
+    observers = []
+    lang = None
+
+    def __init__(self, defaultlang):
+        super(Lang, self).__init__()
+        self.ugettext = None
+        self.lang = defaultlang
+        self.switch_lang(self.lang)
+
+    def _(self, text):
+        return self.ugettext(text)
+
+    def fbind(self, name, func, *args, **kwargs):
+        if name == "_":
+            self.observers.append((func, args, kwargs))
+        else:
+            return super(Lang, self).fbind(name, func, *args, **kwargs)
+
+    def funbind(self, name, func, *args, **kwargs):
+        if name == "_":
+            key = (func, args, kwargs)
+            if key in self.observers:
+                self.observers.remove(key)
+        else:
+            return super(Lang, self).funbind(name, func, *args, **kwargs)
+
+    def switch_lang(self, lang):
+        # get the right locales directory, and instantiate a gettext
+        i18n_dir,_ = os.path.split(find_package_resource('katrain/i18n/__init__.py'))
+        locale_dir = os.path.join(i18n_dir,'locales')
+        locales = gettext.translation('katrain', locale_dir, languages=[lang])
+        self.ugettext = locales.gettext
+
+        # update all the kv rules attached to this text
+        for func, args, kwargs in self.observers:
+            func(args[0],None,None)

katrain/gui.kv

@@ -1,4 +1,5 @@
 #:kivy 1.11.0
+#:import i18n __main__.i18n
 
 #:set PLAYER_MODES ['Human', 'Teach','AI']
 #:set PLAYER_MODE_VALUES ['human','human+undo','ai']
@@ -331,8 +332,8 @@
         pos_hint: {'x': 0}
         on_press: root.nav_drawer.set_state("open")
     StyledButton:
-        text: 'Pass'
-        tooltip_text: '[space]\nPass'
+        text: i18n._('pass-button-text')
+        tooltip_text: i18n._('pass-button-tooltip')
         id: pass_btn
         size_hint: None, 0.5
         pos_hint: {'x': 0.1,'center_y':0.5}
@@ -833,10 +834,12 @@
 <ContentNavigationDrawer@MDBoxLayout+BackgroundColor>:
     orientation: 'vertical'
     background_color: BOX_BACKGROUND_COLOR
-    Label:
-        text: 'sdafs'
-    Label:
-        text: 'sdafs'
+    MDFlatButton:
+        text: i18n._('Dutch')
+        on_press: app.language = 'nl'
+    MDFlatButton:
+        text: i18n._('English')
+        on_press: app.language = 'en'
     MDFlatButton:
         text: 'size'
         on_press: print(self.size,self.parent.size,self.parent.parent.size,self.parent.parent.parent.size,self.parent.parent.parent.parent.size)

katrain/i18n/locales/en/LC_MESSAGES/katrain.po

@@ -0,0 +1,27 @@
+# KaTrain i18n file
+msgid ""
+msgstr ""
+"Language: English\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+msgid "Hello World"
+msgstr "Hello World"
+
+msgid "KataGo"
+msgstr "KataGo"
+
+msgid "English"
+msgstr "English"
+
+msgid "Dutch"
+msgstr "Dutch"
+
+msgid "pass-button-text"
+msgstr "Pass"
+
+msgid "pass-button-tooltip"
+msgstr "[space]\nPass"
+
+

katrain/i18n/locales/nl/LC_MESSAGES/katrain.po

@@ -0,0 +1,23 @@
+# KaTrain i18n file
+msgid ""
+msgstr ""
+"Language: Nederlands\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=utf-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+msgid "Hello World"
+msgstr "Hallo wereld"
+
+msgid "English"
+msgstr "Engels"
+
+msgid "Dutch"
+msgstr "Nederlands"
+
+msgid "pass-button-text"
+msgstr "Pas"
+
+msgid "pass-button-tooltip"
+msgstr "[spatiebalk]\nPas"
+