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# Source code for pywws.Localisation

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

    # pywws - Python software for USB Wireless Weather Stations
    # http://github.com/jim-easterbrook/pywws
    # Copyright (C) 2008-13  Jim Easterbrook  jim@jim-easterbrook.me.uk

    # This program is free software; you can redistribute it and/or
    # modify it under the terms of the GNU General Public License
    # as published by the Free Software Foundation; either version 2
    # of the License, or (at your option) any later version.

    # This program is distributed in the hope that it will be useful,
    # but WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    # GNU General Public License for more details.

    # You should have received a copy of the GNU General Public License
    # along with this program; if not, write to the Free Software
    # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

    """Localisation.py - provide translations of strings into local
    language

    ::

    %s

    Introduction
    ------------

    Some of the pywws modules, such as WindRose.py, can automatically use
    your local language for such things as wind directions. The
    Localisation.py module, mostly copied from examples in the Python
    documentation, enables this.

    Localisation of pywws is done in two parts - translating strings such
    as 'rising very rapidly', and changing the 'locale' which controls
    things like month names and number representation (e.g. '23,2' instead
    of '23.2'). On some computers it may not be possible to set the
    locale, but translated strings can still be used.

    Using a different language
    --------------------------

    The language used by pywws is set in the ``[config]`` section of the
    ``weather.ini`` file. This can be a two-letter language code, such as
    ``en`` (English), or can specify a national variant, such as ``fr_CA``
    (Canadian French). It could also include a character set, for example
    ``de_DE.UTF-8``.

    The choice of language is very system dependant, so Localisation.py
    can be run as a standalone program to test language codes. A good
    starting point might be your system's ``LANG`` environment variable,
    for example::

        jim@brains:~/Documents/weather/pywws/code$ echo $LANG
        en_GB.UTF-8
        jim@brains:~/Documents/weather/pywws/code$ python -m pywws.Localisation -t en_GB.UTF-8
        Locale changed from (None, None) to ('en_GB', 'UTF8')
        Translation set OK
        Locale
          decimal point: 23.2
          date & time: Friday, 14 October (14/10/11 13:02:00)
        Translations
          'NNW' => 'NNW'
          'rising very rapidly' => 'rising very rapidly'
          'Rain at times, very unsettled' => 'Rain at times, very unsettled'
        jim@brains:~/Documents/weather/pywws/code$

    In most cases no more than a two-letter code is required::

        jim@brains:~/Documents/weather/pywws/code$ python -m pywws.Localisation -t fr
        Locale changed from (None, None) to ('fr_FR', 'UTF8')
        Translation set OK
        Locale
          decimal point: 23,2
          date & time: vendredi, 14 octobre (14/10/2011 13:04:44)
        Translations
          'NNW' => 'NNO'
          'rising very rapidly' => 'en hausse très rapide'
          'Rain at times, very unsettled' => 'Quelques précipitations, très perturbé'
        jim@brains:~/Documents/weather/pywws/code$

    If you try an unsupported language, pywws falls back to English::

        jim@brains:~/Documents/weather/pywws/code$ python -m pywws.Localisation -t ja
        Failed to set locale: ja
        No translation file found for: ja
        Locale
          decimal point: 23.2
          date & time: Friday, 14 October (10/14/11 13:08:49)
        Translations
          'NNW' => 'NNW'
          'rising very rapidly' => 'rising very rapidly'
          'Rain at times, very unsettled' => 'Rain at times, very unsettled'
        jim@brains:~/Documents/weather/pywws/code$

    Once you've found a suitable language code that works, you can
    configure pywws to use it by editing your ``weather.ini`` file::

     [config]
     language = fr

    Creating a new translation
    --------------------------

    If there is no translation file for your preferred language then you
    need to create one. See :doc:`../guides/language` for detailed
    instructions.

    """

    __docformat__ = "restructuredtext en"

    __usage__ = """
     usage: python -m pywws.Localisation [options]
     options are:
      -h       or  --help       display this help
      -t code  or  --test code  test use of a language code
    """

    __doc__ %= __usage__
    __usage__ = __doc__.split('\n')[0] + __usage__

    import getopt
    import gettext
    import locale
    import os
    import pkg_resources
    import sys
    import time

    # set translation to be used if SetTranslation is not called
    translation = gettext.NullTranslations()
    # Python 3 translations don't have a ugettext method
    if not hasattr(translation, 'ugettext'):
        translation.ugettext = translation.gettext

    def SetLocale(lang):
        """Set the 'locale' used by a program.

        This affects the entire application, changing the way dates,
        currencies and numbers are represented. It should not be called
        from a library routine that may be used in another program.

        The ``lang`` parameter can be any string that is recognised by
        ``locale.setlocale()``, for example ``en``, ``en_GB`` or ``en_GB.UTF-8``.

        :param lang: language code.
        :type lang: string
        :return: success status.
        :rtype: bool

        """
        # get the default locale
        lc, encoding = locale.getdefaultlocale()
        try:
            if '.' in lang:
                locale.setlocale(locale.LC_ALL, lang)
            else:
                locale.setlocale(locale.LC_ALL, (lang, encoding))
        except locale.Error:
            return False
        return True

    def SetTranslation(lang):
        """Set the translation used by (some) pywws modules.

        This sets the translation object ``Localisation.translation`` to
        use a particular language.

        The ``lang`` parameter can be any string of the form ``en``,
        ``en_GB`` or ``en_GB.UTF-8``. Anything after a ``.`` character is
        ignored. In the case of a string such as ``en_GB``, the routine
        will search for an ``en_GB`` language file before searching for an
        ``en`` one.

        :param lang: language code.
        :type lang: string
        :return: success status.
        :rtype: bool

        """
        global translation
        # make list of possible languages, in order of preference
        langs = list()
        if lang:
            if '.' in lang:
                lang = lang.split('.')[0]
            langs += [lang, lang[:2]]
        # get translation object
        path = pkg_resources.resource_filename('pywws', 'lang')
        codeset = locale.getpreferredencoding()
        if codeset == 'ASCII':
            codeset = 'UTF-8'
        try:
            translation = gettext.translation(
                'pywws', path, languages=langs, codeset=codeset)
            # Python 3 translations don't have a ugettext method
            if not hasattr(translation, 'ugettext'):
                translation.ugettext = translation.gettext
        except IOError:
            return False
        return True

    def SetApplicationLanguage(params):
        """Set the locale and translation for a pywws program.

        This function reads the language from the configuration file, then
        calls :func:`SetLocale` and :func:`SetTranslation`.

        :param params: a :class:`pywws.DataStore.params` object.

        :type params: object

        """
        lang = params.get('config', 'language', None)
        if lang:
            SetLocale(lang)
            SetTranslation(lang)

    def main(argv=None):
        if argv is None:
            argv = sys.argv
        try:
            opts, args = getopt.getopt(argv[1:], "ht:", ['help', 'test='])
        except getopt.error, msg:
            print >>sys.stderr, 'Error: %s\n' % msg
            print >>sys.stderr, __usage__.strip()
            return 1
        # process options
        code = None
        for o, a in opts:
            if o in ('-h', '--help'):
                print __usage__.strip()
                return 0
            elif o in ('-t', '--test'):
                code = a
        # check arguments
        if len(args) != 0:
            print >>sys.stderr, 'Error: no arguments required\n'
            print >>sys.stderr, __usage__.strip()
            return 2
        # test language code
        if code:
            old_locale = locale.getlocale()
            if SetLocale(code):
                new_locale = locale.getlocale()
                print "Locale changed from", old_locale, "to", new_locale
            else:
                print "Failed to set locale:", code
            if SetTranslation(code):
                print "Translation set OK"
            else:
                print "No translation file found for:", code
        # try a few locale / translation effects
        print "Locale"
        print "  decimal point:", locale.format("%4.1f", 23.2)
        print "  date & time:", time.strftime("%A, %d %B (%x %X)")
        print "Translations"
        print "  'NNW' => '%s'" % (translation.lgettext('NNW'))
        print "  'rising very rapidly' => '%s'" % (
            translation.lgettext('rising very rapidly'))
        print "  'Rain at times, very unsettled' => '%s'" % (
            translation.lgettext('Rain at times, very unsettled'))
        return 0

    if __name__ == "__main__":
        sys.exit(main())

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