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# Codice sorgente per pywws.Forecast

    #!/usr/bin/env python

    # 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.

    """Predict future weather using recent data
    ::

    %s

    """

    __docformat__ = "restructuredtext en"
    __usage__ = """
     usage: python -m pywws.Forecast [options] data_dir
     options are:
      -h | --help  display this help
     data_dir is the root directory of the weather data
    """
    __doc__ %= __usage__
    __usage__ = __doc__.split('\n')[0] + __usage__

    from datetime import datetime, timedelta
    import getopt
    import sys

    from pywws import DataStore
    from pywws import Localisation
    from pywws.TimeZone import Local, utc
    from pywws import ZambrettiCore

    def ZambrettiCode(params, hourly_data):
        north = eval(params.get('Zambretti', 'north', 'True'))
        baro_upper = eval(params.get('Zambretti', 'baro upper', '1050.0'))
        baro_lower = eval(params.get('Zambretti', 'baro lower', '950.0'))
        if not hourly_data['rel_pressure']:
            return ''
        if hourly_data['wind_ave'] is None or hourly_data['wind_ave'] < 0.3:
            wind = None
        else:
            wind = hourly_data['wind_dir']
        if hourly_data['pressure_trend'] is None:
            trend = 0.0
        else:
            trend = hourly_data['pressure_trend'] / 3.0
        return ZambrettiCore.ZambrettiCode(
            hourly_data['rel_pressure'], hourly_data['idx'].month, wind, trend,
            north=north, baro_top=baro_upper, baro_bottom=baro_lower)

    def Zambretti(params, hourly_data):
        code = ZambrettiCode(params, hourly_data)
        return Localisation.translation.ugettext(ZambrettiCore.ZambrettiText(code))

    def main(argv=None):
        if argv is None:
            argv = sys.argv
        try:
            opts, args = getopt.getopt(argv[1:], "h", ['help'])
        except getopt.error, msg:
            print >>sys.stderr, 'Error: %s\n' % msg
            print >>sys.stderr, __usage__.strip()
            return 1
        # process options
        for o, a in opts:
            if o in ('-h', '--help'):
                print __usage__.strip()
                return 0
        # check arguments
        if len(args) != 1:
            print >>sys.stderr, "Error: 1 argument required"
            print >>sys.stderr, __usage__.strip()
            return 2
        data_dir = args[0]
        params = DataStore.params(data_dir)
        Localisation.SetApplicationLanguage(params)
        hourly_data = DataStore.hourly_store(data_dir)
        idx = hourly_data.before(datetime.max)
        print 'Zambretti (current):', Zambretti(params, hourly_data[idx])
        idx = idx.replace(tzinfo=utc).astimezone(Local)
        if idx.hour < 8 or (idx.hour == 8 and idx.minute < 30):
            idx -= timedelta(hours=24)
        idx = idx.replace(hour=9, minute=0, second=0)
        idx = hourly_data.nearest(idx.astimezone(utc).replace(tzinfo=None))
        lcl = idx.replace(tzinfo=utc).astimezone(Local)
        print 'Zambretti (at %s):' % lcl.strftime('%H:%M %Z'), Zambretti(
            params, hourly_data[idx])
        return 0

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

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