Initial import

ebook_converter/translations/dynamic.py

@@ -0,0 +1,39 @@
+from __future__ import absolute_import, division, print_function, unicode_literals
+'''
+Dynamic language lookup of translations for user-visible strings.
+'''
+
+__license__   = 'GPL v3'
+__copyright__ = '2008, Marshall T. Vandegrift <llasram@gmail.com>'
+
+import io
+from gettext import GNUTranslations
+from calibre.constants import ispy3
+from calibre.utils.localization import get_lc_messages_path
+from zipfile import ZipFile
+
+__all__ = ['translate']
+
+_CACHE = {}
+
+
+def translate(lang, text):
+    trans = None
+    if lang in _CACHE:
+        trans = _CACHE[lang]
+    else:
+        mpath = get_lc_messages_path(lang)
+        if mpath is not None:
+            with ZipFile(P('localization/locales.zip',
+                allow_user_override=False), 'r') as zf:
+                try:
+                    buf = io.BytesIO(zf.read(mpath + '/messages.mo'))
+                except Exception:
+                    pass
+                else:
+                    trans = GNUTranslations(buf)
+                    _CACHE[lang] = trans
+    if trans is None:
+        return getattr(__builtins__, '_', lambda x: x)(text)
+    f = getattr(trans, 'gettext' if ispy3 else 'ugettext')
+    return f(text)