#!/usr/bin/env python
# -*- coding: utf-8 -*-

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# ***************************************************************************/

import locale
import os

from zenmapCore.Name import APP_NAME


def get_locales():
    """Get a list of locales to use based on system configuration."""
    locales = []
    # locale.getdefaultlocales already looks at LANG et al. on Unix but not on
    # Windows. We look at the environment variables first to allow overriding
    # the system-wide setting on Windows.
    for envar in ("LANGUAGE", "LC_ALL", "LC_MESSAGES", "LANG"):
        val = os.environ.get(envar)
        if val:
            locales = val.split(":")
            break
    try:
        loc, enc = locale.getdefaultlocale()
        if loc is not None:
            locales.append(loc)
    except ValueError:
        # locale.getdefaultlocale can fail with ValueError on certain locale
        # names; it has been seen with at least en_NG.
        # http://bugs.python.org/issue6895
        pass
    return locales


def install_gettext(locale_dir):
    try:
        locale.setlocale(locale.LC_ALL, '')
    except locale.Error:
        # This can happen if the LANG environment variable is set to something
        # invalid, like LANG=nothing or LANG=en_US/utf8 or LANG=us-ascii.
        # Continue without internationalization.
        pass

    try:
        import gettext
    except ImportError:
        pass
    else:
        t = gettext.translation(
                APP_NAME, locale_dir, languages=get_locales(), fallback=True)
        t.install(unicode=True)

# Install a dummy _ function so modules can safely use it after importing this
# module, even if they don't install the gettext version.

import __builtin__
__builtin__.__dict__["_"] = lambda s: s