[gnome-tweak-tool] Use translations from schema files in the UI

[Giovanni Campagna <gcampagna src gnome org>]

commit 743a1b5cc77e798ef6b95dd0564188b889558ca5
Author: Giovanni Campagna <gcampagna src gnome org>
Date:   Sat Sep 8 17:27:42 2012 +0200

    Use translations from schema files in the UI
    
    All GSettings schema files are translated by their respective packages,
    so we can retrieve the translation by looking up the gettext-domain and
    show the localized version of summary and description in the UI.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=683630

 gnome-tweak-tool                 |    1 +
 gtweak/gsettings.py              |   15 +++++++++++++--
 gtweak/tweaks/tweak_interface.py |    3 ---
 gtweak/tweaks/tweak_windows.py   |    1 -
 4 files changed, 14 insertions(+), 6 deletions(-)
---
diff --git a/gnome-tweak-tool b/gnome-tweak-tool
index 6102e1a..c377b01 100755
--- a/gnome-tweak-tool
+++ b/gnome-tweak-tool
@@ -57,6 +57,7 @@ if __name__ == '__main__':
     gtweak.TWEAK_DIR = TWEAK_DIR
     gtweak.DATA_DIR = DATA_DIR
     gtweak.PKG_DATA_DIR = PKG_DATA_DIR
+    gtweak.LOCALE_DIR = LOCALE_DIR
     gtweak.ENABLE_TEST = options.test
     gtweak.APP_NAME = "gnome-tweak-tool"
     gtweak.VERBOSE = options.verbose
diff --git a/gtweak/gsettings.py b/gtweak/gsettings.py
index 2739d6a..c87cb84 100644
--- a/gtweak/gsettings.py
+++ b/gtweak/gsettings.py
@@ -18,6 +18,7 @@
 import logging
 import os.path
 import xml.dom.minidom
+import gettext
 
 import gtweak
 
@@ -46,7 +47,17 @@ class _GSettingsSchema:
 
         try:
             dom = xml.dom.minidom.parse(schema_path)
+            global_gettext_domain = dom.documentElement.getAttribute('gettext-domain')
+            if global_gettext_domain:
+                # We can't know where the schema owner was installed, let's assume it's
+                # the same prefix as ours
+                gettext.bindtextdomain(global_gettext_domain, gtweak.LOCALE_DIR)
             for schema in dom.getElementsByTagName("schema"):
+                gettext_domain = schema.getAttribute('gettext-domain')
+                if gettext_domain:
+                    gettext.bindtextdomain(gettext_domain, gtweak.LOCALE_DIR)
+                else:
+                    gettext_domain = global_gettext_domain
                 if schema_name == schema.getAttribute("id"):
                     for key in schema.getElementsByTagName("key"):
                         #summary is compulsory, description is optional
@@ -61,8 +72,8 @@ class _GSettingsSchema:
                         except:
                             description = ""
                         self._schema[key.getAttribute("name")] = {
-                                "summary"       :   summary,
-                                "description"   :   description
+                                "summary"       :   gettext.dgettext(gettext_domain, summary),
+                                "description"   :   gettext.dgettext(gettext_domain, description)
                         }
         except:
             logging.critical("Error parsing schema %s (%s)" % (schema_name, schema_path), exc_info=True)
diff --git a/gtweak/tweaks/tweak_interface.py b/gtweak/tweaks/tweak_interface.py
index 537ed48..65d197b 100644
--- a/gtweak/tweaks/tweak_interface.py
+++ b/gtweak/tweaks/tweak_interface.py
@@ -30,7 +30,6 @@ class GtkThemeSwitcher(GSettingsComboTweak):
             "org.gnome.desktop.interface",
             "gtk-theme",
             make_combo_list_with_default(self._get_valid_themes(), "Adwaita"),
-            summary=_("GTK+ theme"),
             **options)
 
     def _get_valid_themes(self):
@@ -48,7 +47,6 @@ class IconThemeSwitcher(GSettingsComboTweak):
             "org.gnome.desktop.interface",
             "icon-theme",
             make_combo_list_with_default(self._get_valid_icon_themes(), "gnome"),
-            summary=_("Icon theme"),
             **options)
 
     def _get_valid_icon_themes(self):
@@ -84,7 +82,6 @@ class KeyThemeSwitcher(GSettingsComboTweak):
                 self._get_valid_key_themes(),
                 "Default",
                 default_text=_("<i>Default</i>")),
-            summary=_("Keybinding theme"),
             **options)
 
     def _get_valid_key_themes(self):
diff --git a/gtweak/tweaks/tweak_windows.py b/gtweak/tweaks/tweak_windows.py
index 90af82a..12f6fbf 100644
--- a/gtweak/tweaks/tweak_windows.py
+++ b/gtweak/tweaks/tweak_windows.py
@@ -28,7 +28,6 @@ class WindowThemeSwitcher(GSettingsComboTweak):
             "org.gnome.desktop.wm.preferences",
             "theme",
             make_combo_list_with_default(self._get_valid_themes(), "Adwaita"),
-            summary=_("Window theme"),
             **options)
 
     def _get_valid_themes(self):