File: debdate

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debdate 0.20170714-1
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#!/usr/bin/env python3

# Copyright (C) 2017 Elena Grandi <valhalla@trueelena.org>
# This program is free software. It comes without any warranty, to the
# extent permitted by applicable law. You can redistribute it and/or
# modify it under the terms of the Do What The Fuck You Want To Public
# License, Version 2, as published by Sam Hocevar. See
# http://www.wtfpl.net/ for more details.

# Debian release dates can be found in the package distro-info-data,
# but an hardcoded fallback is included to run this script where such
# package is not available.

import argparse
import csv
import datetime
from dateutil import relativedelta, parser
import unittest

# TODO: these will be read from some other file
RELEASES = [
    (datetime.date(2017, 6, 17), 'stretch'),
    (datetime.date(2015, 4, 25), 'jessie'),
    (datetime.date(2013, 5, 4), 'wheezy'),
    (datetime.date(2011, 2, 6), 'squeeze'),
    (datetime.date(2009, 2, 14), 'lenny'),
    (datetime.date(2007, 4, 8), 'etch'),
    (datetime.date(2005, 6, 6), 'sarge'),
    (datetime.date(2002, 7, 19), 'woody'),
    (datetime.date(2000, 8, 15), 'potato'),
    (datetime.date(1999, 3, 9), 'slink'),
    (datetime.date(1998, 6, 24), 'hamm'),
    (datetime.date(1997, 7, 2), 'bo'),
    (datetime.date(1996, 12, 12), 'rex'),
    (datetime.date(1996, 6, 17), 'buzz'),
    ]
MSG = "Today is day {dody} of year {yodr} of the {release}"
ERR_MSG = "Today is {isodate} of the Debianless Age"


class DebDate:
    def __init__(
            self,
            distro_info_file='/usr/share/distro-info/debian.csv',
            nameless_age=datetime.date(1993, 8, 1)):
        self.releases = []
        try:
            with open(distro_info_file) as fp:
                releases = csv.reader(fp, delimiter=',')
                for row in releases:
                    if len(row) > 4:
                        try:
                            date = datetime.datetime.strptime(
                                row[4],
                                '%Y-%m-%d'
                                )
                        except ValueError:
                            pass
                        else:
                            self.releases.append((date.date(), row[1]))
        except FileNotFoundError:
            releases = []
        self.releases.sort(key=lambda x: x[0], reverse=True)
        if not self.releases:
            self.releases = RELEASES.copy()
        if nameless_age:
            self.releases.append((
                nameless_age,
                'Nameless Age'
                ))

    def get_release(self, day):
        data = {}
        for r in self.releases:
            epoch = r[0]
            data['release'] = r[1]
            if day > epoch:
                break
        if day < epoch:
            raise OutsideTimeError(
                "{day} happened before the beginning of time".format(
                    day=day,
                    )
                )
        if day.year == epoch.year:
            data['dody'] = (day - epoch).days
            data['yodr'] = 1
        else:
            data['dody'] = day.timetuple().tm_yday
            data['yodr'] = day.year - epoch.year + 1
        return data


class OutsideTimeError(ValueError):
    """
    Exception raised before the beginning of time
    """


class TestDebDate(unittest.TestCase):
    def setUp(self):
        self.debdates = [
            DebDate(),
            DebDate(distro_info_file='/no/such/file'),
            ]

    def testFirstYearRelease(self):
        for debdate in self.debdates:
            r = debdate.releases[-2]
            d = r[0] + relativedelta.relativedelta(days=10)
            data = debdate.get_release(d)
            self.assertEqual(data['dody'], 10)
            self.assertEqual(data['yodr'], 1)
            self.assertEqual(data['release'], r[1])

    def testSecondYearRelease(self):
        for debdate in self.debdates:
            r = debdate.releases[-7]
            d = r[0] + relativedelta.relativedelta(years=1)
            data = debdate.get_release(d)
            self.assertEqual(data['dody'], 227)
            self.assertEqual(data['yodr'], 2)
            self.assertEqual(data['release'], r[1])

    def testJanuarySecondYearRelease(self):
        for debdate in self.debdates:
            r = debdate.releases[-7]
            d = datetime.date(r[0].year + 1, 1, 1)
            data = debdate.get_release(d)
            self.assertEqual(data['dody'], 1)
            self.assertEqual(data['yodr'], 2)
            self.assertEqual(data['release'], r[1])

    def testPastLatestRelease(self):
        for debdate in self.debdates:
            r = debdate.releases[0]
            d = r[0] + relativedelta.relativedelta(years=5)
            data = debdate.get_release(d)
            # Day Of The Year will change depending on when is the latest
            # release, so we do not check it
            self.assertEqual(data['yodr'], 6)
            self.assertEqual(data['release'], r[1])

    def testBeforeBeginningOfTime(self):
        for debdate in self.debdates:
            r = debdate.releases[-1]
            d = r[0] + relativedelta.relativedelta(days=-1)
            with self.assertRaises(OutsideTimeError):
                debdate.get_release(d)


class Command:
    def setup_parser(self):
        self.parser = argparse.ArgumentParser(
            description='''
            Convert Gregorian dates to Debian Regnal dates
            '''
            )
        self.date_options = self.parser.add_mutually_exclusive_group()
        self.date_options.add_argument(
            '-d', '--date',
            help='A gregorian date',
            default=None,
            type=parser.parse,
            )
        self.date_options.add_argument(
            '-s', '--seconds',
            help='A date as seconds from the Unix Epoch',
            default=None,
            type=int,
            )
        self.parser.set_defaults(func=self.print_date)
        self.subparsers = self.parser.add_subparsers()
        self.test_parser = self.subparsers.add_parser(
            'test',
            help='Run unit tests',
            )
        self.test_parser.set_defaults(func=self.run_tests)

    def run_tests(self, args):
        suite = unittest.TestLoader().loadTestsFromTestCase(TestDebDate)
        unittest.TextTestRunner(verbosity=1).run(suite)

    def print_date(self, args):
        if args.date:
            date = args.date.date()
        elif args.seconds:
            date = datetime.date.fromtimestamp(args.seconds)
        else:
            date = datetime.date.today()
        debdate = DebDate()
        try:
            data = debdate.get_release(date)
        except OutsideTimeError:
            print(ERR_MSG.format(isodate=date.strftime("%Y-%m-%d")))
        else:
            print(MSG.format(**data))

    def main(self):
        self.setup_parser()
        args = self.parser.parse_args()
        args.func(args)


if __name__ == '__main__':
    Command().main()