# i18n.py - internationalization support for mercurial

#

# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>

#

# This software may be used and distributed according to the terms of the

# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import gettext as gettextmod

import locale

import os

import sys

from . import encoding

# modelled after templater.templatepath:

if getattr(sys, 'frozen', None) is not None:

    module = sys.executable

else:

    module = __file__

_languages = None

if (os.name == 'nt'

    and 'LANGUAGE' not in os.environ

    and 'LC_ALL' not in os.environ

    and 'LC_MESSAGES' not in os.environ

    and 'LANG' not in os.environ):

    # Try to detect UI language by "User Interface Language Management" API

    # if no locale variables are set. Note that locale.getdefaultlocale()

    # uses GetLocaleInfo(), which may be different from UI language.

    # (See http://msdn.microsoft.com/en-us/library/dd374098(v=VS.85).aspx )

    try:

        import ctypes

        langid = ctypes.windll.kernel32.GetUserDefaultUILanguage()

        _languages = [locale.windows_locale[langid]]

    except (ImportError, AttributeError, KeyError):

        # ctypes not found or unknown langid

        pass

_ugettext = None

def setdatapath(datapath):

    localedir = os.path.join(datapath, 'locale')

    t = gettextmod.translation('hg', localedir, _languages, fallback=True)

    global _ugettext

_msgcache = {}

def gettext(message):

    """Translate message.

    The message is looked up in the catalog to get a Unicode string,

    which is encoded in the local encoding before being returned.

    Important: message is restricted to characters in the encoding

    given by sys.getdefaultencoding() which is most likely 'ascii'.

    """

    # If message is None, t.ugettext will return u'None' as the

    # translation whereas our callers expect us to return None.

    if message is None or not _ugettext:

        return message

    if message not in _msgcache:

        if type(message) is unicode:

            # goofy unicode docstrings in test

            paragraphs = message.split(u'\n\n')

        else:

            paragraphs = [p.decode("ascii") for p in message.split('\n\n')]

        # Be careful not to translate the empty string -- it holds the

        # meta data of the .po file.

        u = u'\n\n'.join([p and _ugettext(p) or '' for p in paragraphs])

        try:

            # encoding.tolocal cannot be used since it will first try to

            # decode the Unicode string. Calling u.decode(enc) really

            # means u.encode(sys.getdefaultencoding()).decode(enc). Since

            # the Python encoding defaults to 'ascii', this fails if the

            # translated string use non-ASCII characters.

            _msgcache[message] = u.encode(encoding.encoding, "replace")

        except LookupError:

            # An unknown encoding results in a LookupError.

            _msgcache[message] = message

    return _msgcache[message]

def _plain():

    if 'HGPLAIN' not in os.environ and 'HGPLAINEXCEPT' not in os.environ:

        return False

    exceptions = os.environ.get('HGPLAINEXCEPT', '').strip().split(',')

    return 'i18n' not in exceptions

if _plain():

    _ = lambda message: message

else:

    _ = gettext